1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2016 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
33 #include "c-family/c-target.h"
36 #include "stringpool.h"
38 #include "stor-layout.h"
42 #include "tree-iterator.h"
46 #include "c-family/c-objc.h"
47 #include "c-family/c-pragma.h"
48 #include "c-family/c-ubsan.h"
54 /* Possible cases of bad specifiers type used by bad_specifiers. */
56 BSP_VAR, /* variable */
57 BSP_PARM, /* parameter */
62 static const char *redeclaration_error_message (tree, tree);
64 static int decl_jump_unsafe (tree);
65 static void require_complete_types_for_parms (tree);
66 static int ambi_op_p (enum tree_code);
67 static int unary_op_p (enum tree_code);
68 static void push_local_name (tree);
69 static tree grok_reference_init (tree, tree, tree, int);
70 static tree grokvardecl (tree, tree, tree, const cp_decl_specifier_seq *,
72 static int check_static_variable_definition (tree, tree);
73 static void record_unknown_type (tree, const char *);
74 static tree builtin_function_1 (tree, tree, bool);
75 static int member_function_or_else (tree, tree, enum overload_flags);
76 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
78 static void check_for_uninitialized_const_var (tree);
79 static tree local_variable_p_walkfn (tree *, int *, void *);
80 static tree record_builtin_java_type (const char *, int);
81 static const char *tag_name (enum tag_types);
82 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
83 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
84 static void maybe_deduce_size_from_array_init (tree, tree);
85 static void layout_var_decl (tree);
86 static tree check_initializer (tree, tree, int, vec<tree, va_gc> **);
87 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
88 static void save_function_data (tree);
89 static void copy_type_enum (tree , tree);
90 static void check_function_type (tree, tree);
91 static void finish_constructor_body (void);
92 static void begin_destructor_body (void);
93 static void finish_destructor_body (void);
94 static void record_key_method_defined (tree);
95 static tree create_array_type_for_decl (tree, tree, tree);
96 static tree get_atexit_node (void);
97 static tree get_dso_handle_node (void);
98 static tree start_cleanup_fn (void);
99 static void end_cleanup_fn (void);
100 static tree cp_make_fname_decl (location_t, tree, int);
101 static void initialize_predefined_identifiers (void);
102 static tree check_special_function_return_type
103 (special_function_kind, tree, tree, int, const location_t*);
104 static tree push_cp_library_fn (enum tree_code, tree, int);
105 static tree build_cp_library_fn (tree, enum tree_code, tree, int);
106 static void store_parm_decls (tree);
107 static void initialize_local_var (tree, tree);
108 static void expand_static_init (tree, tree);
110 /* The following symbols are subsumed in the cp_global_trees array, and
111 listed here individually for documentation purposes.
114 tree wchar_decl_node;
116 tree vtable_entry_type;
117 tree delta_type_node;
118 tree __t_desc_type_node;
120 tree class_type_node;
121 tree unknown_type_node;
123 Array type `vtable_entry_type[]'
126 tree vtbl_ptr_type_node;
133 A FUNCTION_DECL which can call `abort'. Not necessarily the
134 one that the user will declare, but sufficient to be called
135 by routines that want to abort the program.
140 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
141 tree tinfo_var_id; */
143 tree cp_global_trees[CPTI_MAX];
145 /* Indicates that there is a type value in some namespace, although
146 that is not necessarily in scope at the moment. */
148 tree global_type_node;
150 /* The node that holds the "name" of the global scope. */
151 tree global_scope_name;
153 #define local_names cp_function_chain->x_local_names
155 /* A list of objects which have constructors or destructors
156 which reside in the global scope. The decl is stored in
157 the TREE_VALUE slot and the initializer is stored
158 in the TREE_PURPOSE slot. */
159 tree static_aggregates;
161 /* Like static_aggregates, but for thread_local variables. */
166 /* A node for the integer constant 2. */
168 tree integer_two_node;
170 /* Used only for jumps to as-yet undefined labels, since jumps to
171 defined labels can have their validity checked immediately. */
173 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
174 struct named_label_use_entry *next;
175 /* The binding level to which this entry is *currently* attached.
176 This is initially the binding level in which the goto appeared,
177 but is modified as scopes are closed. */
178 cp_binding_level *binding_level;
179 /* The head of the names list that was current when the goto appeared,
180 or the inner scope popped. These are the decls that will *not* be
181 skipped when jumping to the label. */
183 /* The location of the goto, for error reporting. */
184 location_t o_goto_locus;
185 /* True if an OpenMP structured block scope has been closed since
186 the goto appeared. This means that the branch from the label will
187 illegally exit an OpenMP scope. */
191 /* A list of all LABEL_DECLs in the function that have names. Here so
192 we can clear out their names' definitions at the end of the
193 function, and so we can check the validity of jumps to these labels. */
195 struct GTY((for_user)) named_label_entry {
196 /* The decl itself. */
199 /* The binding level to which the label is *currently* attached.
200 This is initially set to the binding level in which the label
201 is defined, but is modified as scopes are closed. */
202 cp_binding_level *binding_level;
203 /* The head of the names list that was current when the label was
204 defined, or the inner scope popped. These are the decls that will
205 be skipped when jumping to the label. */
207 /* A vector of all decls from all binding levels that would be
208 crossed by a backward branch to the label. */
209 vec<tree, va_gc> *bad_decls;
211 /* A list of uses of the label, before the label is defined. */
212 struct named_label_use_entry *uses;
214 /* The following bits are set after the label is defined, and are
215 updated as scopes are popped. They indicate that a backward jump
216 to the label will illegally enter a scope of the given flavor. */
220 bool in_transaction_scope;
223 #define named_labels cp_function_chain->x_named_labels
225 /* The number of function bodies which we are currently processing.
226 (Zero if we are at namespace scope, one inside the body of a
227 function, two inside the body of a function in a local class, etc.) */
230 /* States indicating how grokdeclarator() should handle declspecs marked
231 with __attribute__((deprecated)). An object declared as
232 __attribute__((deprecated)) suppresses warnings of uses of other
234 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
237 /* A list of VAR_DECLs whose type was incomplete at the time the
238 variable was declared. */
240 struct GTY(()) incomplete_var {
242 tree incomplete_type;
246 static GTY(()) vec<incomplete_var, va_gc> *incomplete_vars;
248 /* Returns the kind of template specialization we are currently
249 processing, given that it's declaration contained N_CLASS_SCOPES
250 explicit scope qualifications. */
253 current_tmpl_spec_kind (int n_class_scopes)
255 int n_template_parm_scopes = 0;
256 int seen_specialization_p = 0;
257 int innermost_specialization_p = 0;
260 /* Scan through the template parameter scopes. */
261 for (b = current_binding_level;
262 b->kind == sk_template_parms;
265 /* If we see a specialization scope inside a parameter scope,
266 then something is wrong. That corresponds to a declaration
269 template <class T> template <> ...
271 which is always invalid since [temp.expl.spec] forbids the
272 specialization of a class member template if the enclosing
273 class templates are not explicitly specialized as well. */
274 if (b->explicit_spec_p)
276 if (n_template_parm_scopes == 0)
277 innermost_specialization_p = 1;
279 seen_specialization_p = 1;
281 else if (seen_specialization_p == 1)
282 return tsk_invalid_member_spec;
284 ++n_template_parm_scopes;
287 /* Handle explicit instantiations. */
288 if (processing_explicit_instantiation)
290 if (n_template_parm_scopes != 0)
291 /* We've seen a template parameter list during an explicit
292 instantiation. For example:
294 template <class T> template void f(int);
296 This is erroneous. */
297 return tsk_invalid_expl_inst;
299 return tsk_expl_inst;
302 if (n_template_parm_scopes < n_class_scopes)
303 /* We've not seen enough template headers to match all the
304 specialized classes present. For example:
306 template <class T> void R<T>::S<T>::f(int);
308 This is invalid; there needs to be one set of template
309 parameters for each class. */
310 return tsk_insufficient_parms;
311 else if (n_template_parm_scopes == n_class_scopes)
312 /* We're processing a non-template declaration (even though it may
313 be a member of a template class.) For example:
315 template <class T> void S<T>::f(int);
317 The `class T' matches the `S<T>', leaving no template headers
318 corresponding to the `f'. */
320 else if (n_template_parm_scopes > n_class_scopes + 1)
321 /* We've got too many template headers. For example:
323 template <> template <class T> void f (T);
325 There need to be more enclosing classes. */
326 return tsk_excessive_parms;
328 /* This must be a template. It's of the form:
330 template <class T> template <class U> void S<T>::f(U);
332 This is a specialization if the innermost level was a
333 specialization; otherwise it's just a definition of the
335 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
338 /* Exit the current scope. */
346 /* When a label goes out of scope, check to see if that label was used
347 in a valid manner, and issue any appropriate warnings or errors. */
350 pop_label (tree label, tree old_value)
352 if (!processing_template_decl)
354 if (DECL_INITIAL (label) == NULL_TREE)
358 error ("label %q+D used but not defined", label);
359 location = input_location;
360 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
361 /* Avoid crashing later. */
362 define_label (location, DECL_NAME (label));
365 warn_for_unused_label (label);
368 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
371 /* Push all named labels into a vector, so that we can sort it on DECL_UID
372 to avoid code generation differences. */
375 note_label (named_label_entry **slot, vec<named_label_entry **> &labels)
377 labels.quick_push (slot);
381 /* Helper function to sort named label entries in a vector by DECL_UID. */
384 sort_labels (const void *a, const void *b)
386 named_label_entry **slot1 = *(named_label_entry **const *) a;
387 named_label_entry **slot2 = *(named_label_entry **const *) b;
388 if (DECL_UID ((*slot1)->label_decl) < DECL_UID ((*slot2)->label_decl))
390 if (DECL_UID ((*slot1)->label_decl) > DECL_UID ((*slot2)->label_decl))
395 /* At the end of a function, all labels declared within the function
396 go out of scope. BLOCK is the top-level block for the
400 pop_labels (tree block)
404 auto_vec<named_label_entry **, 32> labels;
405 named_label_entry **slot;
408 /* Push all the labels into a vector and sort them by DECL_UID,
409 so that gaps between DECL_UIDs don't affect code generation. */
410 labels.reserve_exact (named_labels->elements ());
411 named_labels->traverse<vec<named_label_entry **> &, note_label> (labels);
412 labels.qsort (sort_labels);
413 FOR_EACH_VEC_ELT (labels, i, slot)
415 struct named_label_entry *ent = *slot;
417 pop_label (ent->label_decl, NULL_TREE);
419 /* Put the labels into the "variables" of the top-level block,
420 so debugger can see them. */
421 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
422 BLOCK_VARS (block) = ent->label_decl;
424 named_labels->clear_slot (slot);
430 /* At the end of a block with local labels, restore the outer definition. */
433 pop_local_label (tree label, tree old_value)
435 struct named_label_entry dummy;
437 pop_label (label, old_value);
439 dummy.label_decl = label;
440 named_label_entry **slot = named_labels->find_slot (&dummy, NO_INSERT);
441 named_labels->clear_slot (slot);
444 /* The following two routines are used to interface to Objective-C++.
445 The binding level is purposely treated as an opaque type. */
448 objc_get_current_scope (void)
450 return current_binding_level;
453 /* The following routine is used by the NeXT-style SJLJ exceptions;
454 variables get marked 'volatile' so as to not be clobbered by
455 _setjmp()/_longjmp() calls. All variables in the current scope,
456 as well as parent scopes up to (but not including) ENCLOSING_BLK
457 shall be thusly marked. */
460 objc_mark_locals_volatile (void *enclosing_blk)
462 cp_binding_level *scope;
464 for (scope = current_binding_level;
465 scope && scope != enclosing_blk;
466 scope = scope->level_chain)
470 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
471 objc_volatilize_decl (decl);
473 /* Do not climb up past the current function. */
474 if (scope->kind == sk_function_parms)
479 /* Update data for defined and undefined labels when leaving a scope. */
482 poplevel_named_label_1 (named_label_entry **slot, cp_binding_level *bl)
484 named_label_entry *ent = *slot;
485 cp_binding_level *obl = bl->level_chain;
487 if (ent->binding_level == bl)
491 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
492 TREE_LISTs representing OVERLOADs, so be careful. */
493 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
495 : TREE_CHAIN (decl)))
496 if (decl_jump_unsafe (decl))
497 vec_safe_push (ent->bad_decls, decl);
499 ent->binding_level = obl;
500 ent->names_in_scope = obl->names;
504 ent->in_try_scope = true;
507 ent->in_catch_scope = true;
510 ent->in_omp_scope = true;
513 ent->in_transaction_scope = true;
521 struct named_label_use_entry *use;
523 for (use = ent->uses; use ; use = use->next)
524 if (use->binding_level == bl)
526 use->binding_level = obl;
527 use->names_in_scope = obl->names;
528 if (bl->kind == sk_omp)
529 use->in_omp_scope = true;
536 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
537 when errors were reported, except for -Werror-unused-but-set-*. */
538 static int unused_but_set_errorcount;
540 /* Exit a binding level.
541 Pop the level off, and restore the state of the identifier-decl mappings
542 that were in effect when this level was entered.
544 If KEEP == 1, this level had explicit declarations, so
545 and create a "block" (a BLOCK node) for the level
546 to record its declarations and subblocks for symbol table output.
548 If FUNCTIONBODY is nonzero, this level is the body of a function,
549 so create a block as if KEEP were set and also clear out all
552 If REVERSE is nonzero, reverse the order of decls before putting
553 them into the BLOCK. */
556 poplevel (int keep, int reverse, int functionbody)
559 /* The chain of decls was accumulated in reverse order.
560 Put it into forward order, just for cleanliness. */
565 int leaving_for_scope;
568 cp_label_binding *label_bind;
570 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
575 gcc_assert (current_binding_level->kind != sk_class);
577 if (current_binding_level->kind == sk_cleanup)
579 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
581 gcc_assert (!vec_safe_length (current_binding_level->class_shadowed));
583 /* We used to use KEEP == 2 to indicate that the new block should go
584 at the beginning of the list of blocks at this binding level,
585 rather than the end. This hack is no longer used. */
586 gcc_assert (keep == 0 || keep == 1);
588 if (current_binding_level->keep)
591 /* Any uses of undefined labels, and any defined labels, now operate
592 under constraints of next binding contour. */
593 if (cfun && !functionbody && named_labels)
594 named_labels->traverse<cp_binding_level *, poplevel_named_label_1>
595 (current_binding_level);
597 /* Get the decls in the order they were written.
598 Usually current_binding_level->names is in reverse order.
599 But parameter decls were previously put in forward order. */
602 current_binding_level->names
603 = decls = nreverse (current_binding_level->names);
605 decls = current_binding_level->names;
607 /* If there were any declarations or structure tags in that level,
608 or if this level is a function body,
609 create a BLOCK to record them for the life of this function. */
611 /* Avoid function body block if possible. */
612 if (functionbody && subblocks && BLOCK_CHAIN (subblocks) == NULL_TREE)
614 else if (keep == 1 || functionbody)
615 block = make_node (BLOCK);
616 if (block != NULL_TREE)
618 BLOCK_VARS (block) = decls;
619 BLOCK_SUBBLOCKS (block) = subblocks;
622 /* In each subblock, record that this is its superior. */
624 for (link = subblocks; link; link = BLOCK_CHAIN (link))
625 BLOCK_SUPERCONTEXT (link) = block;
627 /* We still support the old for-scope rules, whereby the variables
628 in a for-init statement were in scope after the for-statement
629 ended. We only use the new rules if flag_new_for_scope is
632 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
634 /* Before we remove the declarations first check for unused variables. */
635 if ((warn_unused_variable || warn_unused_but_set_variable)
636 && current_binding_level->kind != sk_template_parms
637 && !processing_template_decl)
638 for (tree d = getdecls (); d; d = TREE_CHAIN (d))
640 /* There are cases where D itself is a TREE_LIST. See in
641 push_local_binding where the list of decls returned by
642 getdecls is built. */
643 decl = TREE_CODE (d) == TREE_LIST ? TREE_VALUE (d) : d;
644 tree type = TREE_TYPE (decl);
646 && (! TREE_USED (decl) || !DECL_READ_P (decl))
647 && ! DECL_IN_SYSTEM_HEADER (decl)
648 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl)
649 && type != error_mark_node
650 && (!CLASS_TYPE_P (type)
651 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
652 || lookup_attribute ("warn_unused",
653 TYPE_ATTRIBUTES (TREE_TYPE (decl)))))
655 if (! TREE_USED (decl))
656 warning_at (DECL_SOURCE_LOCATION (decl),
657 OPT_Wunused_variable, "unused variable %qD", decl);
658 else if (DECL_CONTEXT (decl) == current_function_decl
659 // For -Wunused-but-set-variable leave references alone.
660 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
661 && errorcount == unused_but_set_errorcount)
663 warning_at (DECL_SOURCE_LOCATION (decl),
664 OPT_Wunused_but_set_variable,
665 "variable %qD set but not used", decl);
666 unused_but_set_errorcount = errorcount;
671 /* Remove declarations for all the DECLs in this level. */
672 for (link = decls; link; link = TREE_CHAIN (link))
674 if (leaving_for_scope && VAR_P (link)
675 /* It's hard to make this ARM compatibility hack play nicely with
676 lambdas, and it really isn't necessary in C++11 mode. */
677 && cxx_dialect < cxx11
680 tree name = DECL_NAME (link);
684 ob = outer_binding (name,
685 IDENTIFIER_BINDING (name),
688 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
690 ns_binding = NULL_TREE;
692 if (ob && ob->scope == current_binding_level->level_chain)
693 /* We have something like:
698 and we are leaving the `for' scope. There's no reason to
699 keep the binding of the inner `i' in this case. */
700 pop_binding (name, link);
701 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
702 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
703 /* Here, we have something like:
711 We must pop the for-scope binding so we know what's a
712 type and what isn't. */
713 pop_binding (name, link);
716 /* Mark this VAR_DECL as dead so that we can tell we left it
717 there only for backward compatibility. */
718 DECL_DEAD_FOR_LOCAL (link) = 1;
720 /* Keep track of what should have happened when we
721 popped the binding. */
724 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
725 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
728 /* Add it to the list of dead variables in the next
729 outermost binding to that we can remove these when we
730 leave that binding. */
732 current_binding_level->level_chain->dead_vars_from_for,
735 /* Although we don't pop the cxx_binding, we do clear
736 its SCOPE since the scope is going away now. */
737 IDENTIFIER_BINDING (name)->scope
738 = current_binding_level->level_chain;
745 /* Remove the binding. */
748 if (TREE_CODE (decl) == TREE_LIST)
749 decl = TREE_VALUE (decl);
752 if (TREE_CODE (name) == OVERLOAD)
753 name = OVL_FUNCTION (name);
755 gcc_assert (DECL_P (name));
756 pop_binding (DECL_NAME (name), decl);
760 /* Remove declarations for any `for' variables from inner scopes
761 that we kept around. */
762 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level->dead_vars_from_for,
764 pop_binding (DECL_NAME (decl), decl);
766 /* Restore the IDENTIFIER_TYPE_VALUEs. */
767 for (link = current_binding_level->type_shadowed;
768 link; link = TREE_CHAIN (link))
769 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
771 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
772 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level->shadowed_labels,
774 pop_local_label (label_bind->label, label_bind->prev_value);
776 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
777 list if a `using' declaration put them there. The debugging
778 back ends won't understand OVERLOAD, so we remove them here.
779 Because the BLOCK_VARS are (temporarily) shared with
780 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
781 popped all the bindings. */
786 for (d = &BLOCK_VARS (block); *d; )
788 if (TREE_CODE (*d) == TREE_LIST)
789 *d = TREE_CHAIN (*d);
791 d = &DECL_CHAIN (*d);
795 /* If the level being exited is the top level of a function,
796 check over all the labels. */
801 /* Since this is the top level block of a function, the vars are
802 the function's parameters. Don't leave them in the BLOCK
803 because they are found in the FUNCTION_DECL instead. */
804 BLOCK_VARS (block) = 0;
808 pop_labels (subblocks);
811 kind = current_binding_level->kind;
812 if (kind == sk_cleanup)
816 /* If this is a temporary binding created for a cleanup, then we'll
817 have pushed a statement list level. Pop that, create a new
818 BIND_EXPR for the block, and insert it into the stream. */
819 stmt = pop_stmt_list (current_binding_level->statement_list);
820 stmt = c_build_bind_expr (input_location, block, stmt);
827 /* The current function is being defined, so its DECL_INITIAL
828 should be error_mark_node. */
829 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
830 DECL_INITIAL (current_function_decl) = block ? block : subblocks;
833 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
835 if (BLOCK_SUBBLOCKS (subblocks))
836 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks)) = 1;
839 BLOCK_OUTER_CURLY_BRACE_P (subblocks) = 1;
843 current_binding_level->blocks
844 = block_chainon (current_binding_level->blocks, block);
846 /* If we did not make a block for the level just exited,
847 any blocks made for inner levels
848 (since they cannot be recorded as subblocks in that level)
849 must be carried forward so they will later become subblocks
850 of something else. */
852 current_binding_level->blocks
853 = block_chainon (current_binding_level->blocks, subblocks);
855 /* Each and every BLOCK node created here in `poplevel' is important
856 (e.g. for proper debugging information) so if we created one
857 earlier, mark it as "used". */
859 TREE_USED (block) = 1;
861 /* All temporary bindings created for cleanups are popped silently. */
862 if (kind == sk_cleanup)
865 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
869 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
870 itself, calling F for each. The DATA is passed to F as well. */
873 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
876 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
878 result |= (*f) (name_space, data);
880 for (; current; current = DECL_CHAIN (current))
881 result |= walk_namespaces_r (current, f, data);
886 /* Walk all the namespaces, calling F for each. The DATA is passed to
890 walk_namespaces (walk_namespaces_fn f, void* data)
892 return walk_namespaces_r (global_namespace, f, data);
895 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
898 wrapup_globals_for_namespace (tree name_space, void* data ATTRIBUTE_UNUSED)
900 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
901 vec<tree, va_gc> *statics = level->static_decls;
902 tree *vec = statics->address ();
903 int len = statics->length ();
905 if (warn_unused_function)
909 FOR_EACH_VEC_SAFE_ELT (statics, i, decl)
910 if (TREE_CODE (decl) == FUNCTION_DECL
911 && DECL_INITIAL (decl) == 0
912 && DECL_EXTERNAL (decl)
913 && !TREE_PUBLIC (decl)
914 && !DECL_ARTIFICIAL (decl)
915 && !TREE_NO_WARNING (decl))
917 warning (OPT_Wunused_function,
918 "%q+F declared %<static%> but never defined", decl);
919 TREE_NO_WARNING (decl) = 1;
923 /* Write out any globals that need to be output. */
924 return wrapup_global_declarations (vec, len);
927 /* In C++, you don't have to write `struct S' to refer to `S'; you
928 can just use `S'. We accomplish this by creating a TYPE_DECL as
929 if the user had written `typedef struct S S'. Create and return
930 the TYPE_DECL for TYPE. */
933 create_implicit_typedef (tree name, tree type)
937 decl = build_decl (input_location, TYPE_DECL, name, type);
938 DECL_ARTIFICIAL (decl) = 1;
939 /* There are other implicit type declarations, like the one *within*
940 a class that allows you to write `S::S'. We must distinguish
942 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
943 TYPE_NAME (type) = decl;
944 TYPE_STUB_DECL (type) = decl;
949 /* Remember a local name for name-mangling purposes. */
952 push_local_name (tree decl)
957 timevar_start (TV_NAME_LOOKUP);
959 name = DECL_NAME (decl);
961 nelts = vec_safe_length (local_names);
962 for (i = 0; i < nelts; i++)
964 t = (*local_names)[i];
965 if (DECL_NAME (t) == name)
967 if (!DECL_LANG_SPECIFIC (decl))
968 retrofit_lang_decl (decl);
969 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
970 if (DECL_DISCRIMINATOR_SET_P (t))
971 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
973 DECL_DISCRIMINATOR (decl) = 1;
975 (*local_names)[i] = decl;
976 timevar_stop (TV_NAME_LOOKUP);
981 vec_safe_push (local_names, decl);
982 timevar_stop (TV_NAME_LOOKUP);
985 /* Subroutine of duplicate_decls: return truthvalue of whether
986 or not types of these decls match.
988 For C++, we must compare the parameter list so that `int' can match
989 `int&' in a parameter position, but `int&' is not confused with
993 decls_match (tree newdecl, tree olddecl)
997 if (newdecl == olddecl)
1000 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
1001 /* If the two DECLs are not even the same kind of thing, we're not
1002 interested in their types. */
1005 gcc_assert (DECL_P (newdecl));
1007 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1009 tree f1 = TREE_TYPE (newdecl);
1010 tree f2 = TREE_TYPE (olddecl);
1011 tree p1 = TYPE_ARG_TYPES (f1);
1012 tree p2 = TYPE_ARG_TYPES (f2);
1015 /* Specializations of different templates are different functions
1016 even if they have the same type. */
1017 tree t1 = (DECL_USE_TEMPLATE (newdecl)
1018 ? DECL_TI_TEMPLATE (newdecl)
1020 tree t2 = (DECL_USE_TEMPLATE (olddecl)
1021 ? DECL_TI_TEMPLATE (olddecl)
1026 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1027 && ! (DECL_EXTERN_C_P (newdecl)
1028 && DECL_EXTERN_C_P (olddecl)))
1031 /* A new declaration doesn't match a built-in one unless it
1032 is also extern "C". */
1033 if (DECL_IS_BUILTIN (olddecl)
1034 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
1037 if (TREE_CODE (f1) != TREE_CODE (f2))
1040 /* A declaration with deduced return type should use its pre-deduction
1041 type for declaration matching. */
1042 r2 = fndecl_declared_return_type (olddecl);
1044 if (same_type_p (TREE_TYPE (f1), r2))
1046 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
1047 && (DECL_BUILT_IN (olddecl)
1048 #ifndef NO_IMPLICIT_EXTERN_C
1049 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
1050 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
1054 types_match = self_promoting_args_p (p1);
1055 if (p1 == void_list_node)
1056 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1058 #ifndef NO_IMPLICIT_EXTERN_C
1059 else if (!prototype_p (f1)
1060 && (DECL_EXTERN_C_P (olddecl)
1061 && DECL_IN_SYSTEM_HEADER (olddecl)
1062 && !DECL_CLASS_SCOPE_P (olddecl))
1063 && (DECL_EXTERN_C_P (newdecl)
1064 && DECL_IN_SYSTEM_HEADER (newdecl)
1065 && !DECL_CLASS_SCOPE_P (newdecl)))
1067 types_match = self_promoting_args_p (p2);
1068 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1074 && type_memfn_rqual (f1) == type_memfn_rqual (f2)
1075 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1076 || comp_type_attributes (TREE_TYPE (newdecl),
1077 TREE_TYPE (olddecl)) != 0);
1082 /* The decls dont match if they correspond to two different versions
1083 of the same function. Disallow extern "C" functions to be
1084 versions for now. */
1086 && !DECL_EXTERN_C_P (newdecl)
1087 && !DECL_EXTERN_C_P (olddecl)
1088 && targetm.target_option.function_versions (newdecl, olddecl))
1090 /* Mark functions as versions if necessary. Modify the mangled decl
1091 name if necessary. */
1092 if (DECL_FUNCTION_VERSIONED (newdecl)
1093 && DECL_FUNCTION_VERSIONED (olddecl))
1095 if (!DECL_FUNCTION_VERSIONED (newdecl))
1097 DECL_FUNCTION_VERSIONED (newdecl) = 1;
1098 if (DECL_ASSEMBLER_NAME_SET_P (newdecl))
1099 mangle_decl (newdecl);
1101 if (!DECL_FUNCTION_VERSIONED (olddecl))
1103 DECL_FUNCTION_VERSIONED (olddecl) = 1;
1104 if (DECL_ASSEMBLER_NAME_SET_P (olddecl))
1105 mangle_decl (olddecl);
1107 cgraph_node::record_function_versions (olddecl, newdecl);
1111 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1113 tree oldres = DECL_TEMPLATE_RESULT (olddecl);
1114 tree newres = DECL_TEMPLATE_RESULT (newdecl);
1116 if (TREE_CODE (newres) != TREE_CODE (oldres))
1119 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1120 DECL_TEMPLATE_PARMS (olddecl)))
1123 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1124 types_match = (same_type_p (TREE_TYPE (oldres), TREE_TYPE (newres))
1125 && equivalently_constrained (olddecl, newdecl));
1127 // We don't need to check equivalently_constrained for variable and
1128 // function templates because we check it on the results.
1129 types_match = decls_match (oldres, newres);
1133 /* Need to check scope for variable declaration (VAR_DECL).
1134 For typedef (TYPE_DECL), scope is ignored. */
1136 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1138 Two declarations for an object with C language linkage
1139 with the same name (ignoring the namespace that qualify
1140 it) that appear in different namespace scopes refer to
1142 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1145 if (TREE_TYPE (newdecl) == error_mark_node)
1146 types_match = TREE_TYPE (olddecl) == error_mark_node;
1147 else if (TREE_TYPE (olddecl) == NULL_TREE)
1148 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1149 else if (TREE_TYPE (newdecl) == NULL_TREE)
1152 types_match = comptypes (TREE_TYPE (newdecl),
1153 TREE_TYPE (olddecl),
1154 COMPARE_REDECLARATION);
1157 // Normal functions can be constrained, as can variable partial
1159 if (types_match && VAR_OR_FUNCTION_DECL_P (newdecl))
1160 types_match = equivalently_constrained (newdecl, olddecl);
1165 /* If NEWDECL is `static' and an `extern' was seen previously,
1166 warn about it. OLDDECL is the previous declaration.
1168 Note that this does not apply to the C++ case of declaring
1169 a variable `extern const' and then later `const'.
1171 Don't complain about built-in functions, since they are beyond
1172 the user's control. */
1175 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1177 if (TREE_CODE (newdecl) == TYPE_DECL
1178 || TREE_CODE (newdecl) == TEMPLATE_DECL
1179 || TREE_CODE (newdecl) == CONST_DECL
1180 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1183 /* Don't get confused by static member functions; that's a different
1185 if (TREE_CODE (newdecl) == FUNCTION_DECL
1186 && DECL_STATIC_FUNCTION_P (newdecl))
1189 /* If the old declaration was `static', or the new one isn't, then
1190 everything is OK. */
1191 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1194 /* It's OK to declare a builtin function as `static'. */
1195 if (TREE_CODE (olddecl) == FUNCTION_DECL
1196 && DECL_ARTIFICIAL (olddecl))
1199 if (permerror (DECL_SOURCE_LOCATION (newdecl),
1200 "%qD was declared %<extern%> and later %<static%>", newdecl))
1201 inform (DECL_SOURCE_LOCATION (olddecl),
1202 "previous declaration of %qD", olddecl);
1205 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1206 function templates. If their exception specifications do not
1207 match, issue a diagnostic. */
1210 check_redeclaration_exception_specification (tree new_decl,
1213 tree new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1214 tree old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1216 /* Two default specs are equivalent, don't force evaluation. */
1217 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions)
1218 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions))
1221 maybe_instantiate_noexcept (new_decl);
1222 maybe_instantiate_noexcept (old_decl);
1223 new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1224 old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1228 If any declaration of a function has an exception-specification,
1229 all declarations, including the definition and an explicit
1230 specialization, of that function shall have an
1231 exception-specification with the same set of type-ids. */
1232 if (! DECL_IS_BUILTIN (old_decl)
1233 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1236 = "declaration of %q+F has a different exception specifier";
1237 bool complained = true;
1238 if (DECL_IN_SYSTEM_HEADER (old_decl))
1239 complained = pedwarn (0, OPT_Wsystem_headers, msg, new_decl);
1240 else if (!flag_exceptions)
1241 /* We used to silently permit mismatched eh specs with
1242 -fno-exceptions, so make them a pedwarn now. */
1243 complained = pedwarn (0, OPT_Wpedantic, msg, new_decl);
1245 error (msg, new_decl);
1247 inform (0, "from previous declaration %q+F", old_decl);
1251 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1252 Otherwise issue diagnostics. */
1255 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1257 old_decl = STRIP_TEMPLATE (old_decl);
1258 new_decl = STRIP_TEMPLATE (new_decl);
1259 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1260 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1262 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1263 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1265 if (TREE_CODE (old_decl) == FUNCTION_DECL)
1267 if (DECL_BUILT_IN (old_decl))
1269 /* Hide a built-in declaration. */
1270 DECL_DECLARED_CONSTEXPR_P (old_decl)
1271 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1274 /* 7.1.5 [dcl.constexpr]
1275 Note: An explicit specialization can differ from the template
1276 declaration with respect to the constexpr specifier. */
1277 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl)
1278 && DECL_TEMPLATE_SPECIALIZATION (new_decl))
1281 error ("redeclaration %q+D differs in %<constexpr%>", new_decl);
1282 error ("from previous declaration %q+D", old_decl);
1288 // If OLDDECL and NEWDECL are concept declarations with the same type
1289 // (i.e., and template parameters), but different requirements,
1290 // emit diagnostics and return true. Otherwise, return false.
1292 check_concept_refinement (tree olddecl, tree newdecl)
1294 if (!DECL_DECLARED_CONCEPT_P (olddecl) || !DECL_DECLARED_CONCEPT_P (newdecl))
1297 tree d1 = DECL_TEMPLATE_RESULT (olddecl);
1298 tree d2 = DECL_TEMPLATE_RESULT (newdecl);
1299 if (TREE_CODE (d1) != TREE_CODE (d2))
1302 tree t1 = TREE_TYPE (d1);
1303 tree t2 = TREE_TYPE (d2);
1304 if (TREE_CODE (d1) == FUNCTION_DECL)
1306 if (compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2))
1307 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl),
1308 DECL_TEMPLATE_PARMS (newdecl))
1309 && !equivalently_constrained (olddecl, newdecl))
1311 error ("cannot specialize concept %q#D", olddecl);
1318 /* DECL is a redeclaration of a function or function template. If
1319 it does have default arguments issue a diagnostic. Note: this
1320 function is used to enforce the requirements in C++11 8.3.6 about
1321 no default arguments in redeclarations. */
1324 check_redeclaration_no_default_args (tree decl)
1326 gcc_assert (DECL_DECLARES_FUNCTION_P (decl));
1328 for (tree t = FUNCTION_FIRST_USER_PARMTYPE (decl);
1329 t && t != void_list_node; t = TREE_CHAIN (t))
1330 if (TREE_PURPOSE (t))
1332 permerror (DECL_SOURCE_LOCATION (decl),
1333 "redeclaration of %q#D may not have default "
1339 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1340 && lookup_attribute ("gnu_inline", \
1341 DECL_ATTRIBUTES (fn)))
1343 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1344 If the redeclaration is invalid, a diagnostic is issued, and the
1345 error_mark_node is returned. Otherwise, OLDDECL is returned.
1347 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1350 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1353 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1355 unsigned olddecl_uid = DECL_UID (olddecl);
1356 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1357 int new_defines_function = 0;
1358 tree new_template_info;
1360 if (newdecl == olddecl)
1363 types_match = decls_match (newdecl, olddecl);
1365 /* If either the type of the new decl or the type of the old decl is an
1366 error_mark_node, then that implies that we have already issued an
1367 error (earlier) for some bogus type specification, and in that case,
1368 it is rather pointless to harass the user with yet more error message
1369 about the same declaration, so just pretend the types match here. */
1370 if (TREE_TYPE (newdecl) == error_mark_node
1371 || TREE_TYPE (olddecl) == error_mark_node)
1372 return error_mark_node;
1374 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1375 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1377 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1378 && TREE_CODE (olddecl) != TEMPLATE_DECL
1379 && check_raw_literal_operator (olddecl))
1380 error ("literal operator template %q+D conflicts with"
1381 " raw literal operator %qD", newdecl, olddecl);
1382 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1383 && TREE_CODE (olddecl) == TEMPLATE_DECL
1384 && check_raw_literal_operator (newdecl))
1385 error ("raw literal operator %q+D conflicts with"
1386 " literal operator template %qD", newdecl, olddecl);
1389 if (DECL_P (olddecl)
1390 && TREE_CODE (newdecl) == FUNCTION_DECL
1391 && TREE_CODE (olddecl) == FUNCTION_DECL
1392 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1394 if (DECL_DECLARED_INLINE_P (newdecl)
1395 && DECL_UNINLINABLE (newdecl)
1396 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1397 /* Already warned elsewhere. */;
1398 else if (DECL_DECLARED_INLINE_P (olddecl)
1399 && DECL_UNINLINABLE (olddecl)
1400 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1401 /* Already warned. */;
1402 else if (DECL_DECLARED_INLINE_P (newdecl)
1403 && DECL_UNINLINABLE (olddecl)
1404 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1406 if (warning_at (DECL_SOURCE_LOCATION (newdecl),
1407 OPT_Wattributes, "function %qD redeclared as inline",
1409 inform (DECL_SOURCE_LOCATION (olddecl),
1410 "previous declaration of %qD with attribute noinline",
1413 else if (DECL_DECLARED_INLINE_P (olddecl)
1414 && DECL_UNINLINABLE (newdecl)
1415 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1417 if (warning_at (DECL_SOURCE_LOCATION (newdecl),
1418 OPT_Wattributes, "function %qD redeclared with "
1419 "attribute noinline", newdecl))
1420 inform (DECL_SOURCE_LOCATION (olddecl),
1421 "previous declaration of %qD was inline",
1426 /* Check for redeclaration and other discrepancies. */
1427 if (TREE_CODE (olddecl) == FUNCTION_DECL
1428 && DECL_ARTIFICIAL (olddecl))
1430 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1431 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1433 /* Avoid warnings redeclaring built-ins which have not been
1434 explicitly declared. */
1435 if (DECL_ANTICIPATED (olddecl))
1438 /* If you declare a built-in or predefined function name as static,
1439 the old definition is overridden, but optionally warn this was a
1440 bad choice of name. */
1441 if (! TREE_PUBLIC (newdecl))
1443 warning (OPT_Wshadow,
1444 DECL_BUILT_IN (olddecl)
1445 ? G_("shadowing built-in function %q#D")
1446 : G_("shadowing library function %q#D"), olddecl);
1447 /* Discard the old built-in function. */
1450 /* If the built-in is not ansi, then programs can override
1451 it even globally without an error. */
1452 else if (! DECL_BUILT_IN (olddecl))
1453 warning_at (DECL_SOURCE_LOCATION (newdecl), 0,
1454 "library function %q#D redeclared as non-function %q#D",
1457 error ("declaration of %q+#D conflicts with built-in "
1458 "declaration %q#D", newdecl, olddecl);
1461 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl))
1463 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl));
1464 error_at (DECL_SOURCE_LOCATION (newdecl),
1465 "redeclaration of %<pragma omp declare reduction%>");
1466 inform (DECL_SOURCE_LOCATION (olddecl),
1467 "previous %<pragma omp declare reduction%> declaration");
1468 return error_mark_node;
1470 else if (!types_match)
1472 /* Avoid warnings redeclaring built-ins which have not been
1473 explicitly declared. */
1474 if (DECL_ANTICIPATED (olddecl))
1476 /* Deal with fileptr_type_node. FILE type is not known
1477 at the time we create the builtins. */
1480 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1481 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1483 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1486 else if (TREE_VALUE (t2) == fileptr_type_node)
1488 tree t = TREE_VALUE (t1);
1491 && TYPE_IDENTIFIER (TREE_TYPE (t))
1492 == get_identifier ("FILE")
1493 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1495 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1497 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1498 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1499 types_match = decls_match (newdecl, olddecl);
1501 return duplicate_decls (newdecl, olddecl,
1503 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1506 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1509 else if ((DECL_EXTERN_C_P (newdecl)
1510 && DECL_EXTERN_C_P (olddecl))
1511 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1512 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1514 /* A near match; override the builtin. */
1516 if (TREE_PUBLIC (newdecl))
1517 warning_at (DECL_SOURCE_LOCATION (newdecl), 0,
1518 "new declaration %q#D ambiguates built-in "
1519 "declaration %q#D", newdecl, olddecl);
1521 warning (OPT_Wshadow,
1522 DECL_BUILT_IN (olddecl)
1523 ? G_("shadowing built-in function %q#D")
1524 : G_("shadowing library function %q#D"), olddecl);
1527 /* Discard the old built-in function. */
1530 /* Replace the old RTL to avoid problems with inlining. */
1531 COPY_DECL_RTL (newdecl, olddecl);
1533 /* Even if the types match, prefer the new declarations type for
1534 built-ins which have not been explicitly declared, for
1535 exception lists, etc... */
1536 else if (DECL_IS_BUILTIN (olddecl))
1538 tree type = TREE_TYPE (newdecl);
1539 tree attribs = (*targetm.merge_type_attributes)
1540 (TREE_TYPE (olddecl), type);
1542 type = cp_build_type_attribute_variant (type, attribs);
1543 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1546 /* If a function is explicitly declared "throw ()", propagate that to
1547 the corresponding builtin. */
1548 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1549 && DECL_ANTICIPATED (olddecl)
1550 && TREE_NOTHROW (newdecl)
1551 && !TREE_NOTHROW (olddecl))
1553 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1554 tree tmpdecl = builtin_decl_explicit (fncode);
1555 if (tmpdecl && tmpdecl != olddecl && types_match)
1556 TREE_NOTHROW (tmpdecl) = 1;
1559 /* Whether or not the builtin can throw exceptions has no
1560 bearing on this declarator. */
1561 TREE_NOTHROW (olddecl) = 0;
1563 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1565 /* If a builtin function is redeclared as `static', merge
1566 the declarations, but make the original one static. */
1567 DECL_THIS_STATIC (olddecl) = 1;
1568 TREE_PUBLIC (olddecl) = 0;
1570 /* Make the old declaration consistent with the new one so
1571 that all remnants of the builtin-ness of this function
1572 will be banished. */
1573 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1574 COPY_DECL_RTL (newdecl, olddecl);
1577 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1579 /* C++ Standard, 3.3, clause 4:
1580 "[Note: a namespace name or a class template name must be unique
1581 in its declarative region (7.3.2, clause 14). ]" */
1582 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1583 && TREE_CODE (newdecl) != NAMESPACE_DECL
1584 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1585 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1586 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1587 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1589 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1590 && TREE_CODE (newdecl) != TYPE_DECL)
1591 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1592 && TREE_CODE (olddecl) != TYPE_DECL))
1594 /* We do nothing special here, because C++ does such nasty
1595 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1596 get shadowed, and know that if we need to find a TYPE_DECL
1597 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1598 slot of the identifier. */
1602 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1603 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1604 || (TREE_CODE (olddecl) == FUNCTION_DECL
1605 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1609 error ("%q#D redeclared as different kind of symbol", newdecl);
1610 if (TREE_CODE (olddecl) == TREE_LIST)
1611 olddecl = TREE_VALUE (olddecl);
1612 inform (DECL_SOURCE_LOCATION (olddecl),
1613 "previous declaration %q#D", olddecl);
1615 return error_mark_node;
1617 else if (!types_match)
1619 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1620 /* These are certainly not duplicate declarations; they're
1621 from different scopes. */
1624 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1626 /* The name of a class template may not be declared to refer to
1627 any other template, class, function, object, namespace, value,
1628 or type in the same scope. */
1629 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1630 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1632 error ("conflicting declaration of template %q+#D", newdecl);
1633 inform (DECL_SOURCE_LOCATION (olddecl),
1634 "previous declaration %q#D", olddecl);
1635 return error_mark_node;
1637 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1638 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1639 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1640 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1641 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1642 DECL_TEMPLATE_PARMS (olddecl))
1643 /* Template functions can be disambiguated by
1645 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1646 TREE_TYPE (TREE_TYPE (olddecl)))
1647 // Template functions can also be disambiguated by
1649 && equivalently_constrained (olddecl, newdecl))
1651 error ("ambiguating new declaration %q+#D", newdecl);
1652 inform (DECL_SOURCE_LOCATION (olddecl),
1653 "old declaration %q#D", olddecl);
1655 else if (check_concept_refinement (olddecl, newdecl))
1656 return error_mark_node;
1659 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1661 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1663 error ("conflicting declaration of C function %q+#D",
1665 inform (DECL_SOURCE_LOCATION (olddecl),
1666 "previous declaration %q#D", olddecl);
1669 /* For function versions, params and types match, but they
1670 are not ambiguous. */
1671 else if ((!DECL_FUNCTION_VERSIONED (newdecl)
1672 && !DECL_FUNCTION_VERSIONED (olddecl))
1673 // The functions have the same parameter types.
1674 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1675 TYPE_ARG_TYPES (TREE_TYPE (olddecl)))
1676 // And the same constraints.
1677 && equivalently_constrained (newdecl, olddecl))
1679 error ("ambiguating new declaration of %q+#D", newdecl);
1680 inform (DECL_SOURCE_LOCATION (olddecl),
1681 "old declaration %q#D", olddecl);
1682 return error_mark_node;
1689 error ("conflicting declaration %q+#D", newdecl);
1690 inform (DECL_SOURCE_LOCATION (olddecl),
1691 "previous declaration as %q#D", olddecl);
1692 return error_mark_node;
1695 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1696 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1697 && (!DECL_TEMPLATE_INFO (newdecl)
1698 || (DECL_TI_TEMPLATE (newdecl)
1699 != DECL_TI_TEMPLATE (olddecl))))
1700 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1701 && (!DECL_TEMPLATE_INFO (olddecl)
1702 || (DECL_TI_TEMPLATE (olddecl)
1703 != DECL_TI_TEMPLATE (newdecl))))))
1704 /* It's OK to have a template specialization and a non-template
1705 with the same type, or to have specializations of two
1706 different templates with the same type. Note that if one is a
1707 specialization, and the other is an instantiation of the same
1708 template, that we do not exit at this point. That situation
1709 can occur if we instantiate a template class, and then
1710 specialize one of its methods. This situation is valid, but
1711 the declarations must be merged in the usual way. */
1713 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1714 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1715 && !DECL_USE_TEMPLATE (newdecl))
1716 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1717 && !DECL_USE_TEMPLATE (olddecl))))
1718 /* One of the declarations is a template instantiation, and the
1719 other is not a template at all. That's OK. */
1721 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1723 /* In [namespace.alias] we have:
1725 In a declarative region, a namespace-alias-definition can be
1726 used to redefine a namespace-alias declared in that declarative
1727 region to refer only to the namespace to which it already
1730 Therefore, if we encounter a second alias directive for the same
1731 alias, we can just ignore the second directive. */
1732 if (DECL_NAMESPACE_ALIAS (newdecl)
1733 && (DECL_NAMESPACE_ALIAS (newdecl)
1734 == DECL_NAMESPACE_ALIAS (olddecl)))
1736 /* [namespace.alias]
1738 A namespace-name or namespace-alias shall not be declared as
1739 the name of any other entity in the same declarative region.
1740 A namespace-name defined at global scope shall not be
1741 declared as the name of any other entity in any global scope
1743 error ("conflicting declaration of namespace %q+D", newdecl);
1744 inform (DECL_SOURCE_LOCATION (olddecl),
1745 "previous declaration of namespace %qD here", olddecl);
1746 return error_mark_node;
1750 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1753 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1754 if (DECL_NAME (olddecl) != NULL_TREE)
1755 inform (DECL_SOURCE_LOCATION (olddecl),
1756 (DECL_INITIAL (olddecl) && namespace_bindings_p ())
1757 ? G_("%q#D previously defined here")
1758 : G_("%q#D previously declared here"), olddecl);
1759 return error_mark_node;
1761 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1762 && DECL_INITIAL (olddecl) != NULL_TREE
1763 && !prototype_p (TREE_TYPE (olddecl))
1764 && prototype_p (TREE_TYPE (newdecl)))
1766 /* Prototype decl follows defn w/o prototype. */
1767 if (warning_at (DECL_SOURCE_LOCATION (newdecl), 0,
1768 "prototype specified for %q#D", newdecl))
1769 inform (DECL_SOURCE_LOCATION (olddecl),
1770 "previous non-prototype definition here");
1772 else if (VAR_OR_FUNCTION_DECL_P (olddecl)
1773 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1776 If two declarations of the same function or object
1777 specify different linkage-specifications ..., the program
1778 is ill-formed.... Except for functions with C++ linkage,
1779 a function declaration without a linkage specification
1780 shall not precede the first linkage specification for
1781 that function. A function can be declared without a
1782 linkage specification after an explicit linkage
1783 specification has been seen; the linkage explicitly
1784 specified in the earlier declaration is not affected by
1785 such a function declaration.
1787 DR 563 raises the question why the restrictions on
1788 functions should not also apply to objects. Older
1789 versions of G++ silently ignore the linkage-specification
1797 which is clearly wrong. Therefore, we now treat objects
1799 if (current_lang_depth () == 0)
1801 /* There is no explicit linkage-specification, so we use
1802 the linkage from the previous declaration. */
1803 if (!DECL_LANG_SPECIFIC (newdecl))
1804 retrofit_lang_decl (newdecl);
1805 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1809 error ("conflicting declaration of %q+#D with %qL linkage",
1810 newdecl, DECL_LANGUAGE (newdecl));
1811 inform (DECL_SOURCE_LOCATION (olddecl),
1812 "previous declaration with %qL linkage",
1813 DECL_LANGUAGE (olddecl));
1817 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1819 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1821 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1822 if (DECL_FUNCTION_MEMBER_P (olddecl)
1823 && (/* grokfndecl passes member function templates too
1824 as FUNCTION_DECLs. */
1825 DECL_TEMPLATE_INFO (olddecl)
1827 Default arguments for a member function of a class
1828 template shall be specified on the initial declaration
1829 of the member function within the class template. */
1830 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl))))
1831 check_redeclaration_no_default_args (newdecl);
1834 tree t1 = FUNCTION_FIRST_USER_PARMTYPE (olddecl);
1835 tree t2 = FUNCTION_FIRST_USER_PARMTYPE (newdecl);
1838 for (; t1 && t1 != void_list_node;
1839 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1840 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1842 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1845 if (permerror (input_location,
1846 "default argument given for parameter "
1847 "%d of %q#D", i, newdecl))
1848 inform (DECL_SOURCE_LOCATION (olddecl),
1849 "previous specification in %q#D here",
1854 error ("default argument given for parameter %d "
1855 "of %q#D", i, newdecl);
1856 inform (DECL_SOURCE_LOCATION (olddecl),
1857 "previous specification in %q#D here",
1865 /* Do not merge an implicit typedef with an explicit one. In:
1869 typedef class A A __attribute__ ((foo));
1871 the attribute should apply only to the typedef. */
1872 if (TREE_CODE (olddecl) == TYPE_DECL
1873 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1874 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1877 /* If new decl is `static' and an `extern' was seen previously,
1879 warn_extern_redeclared_static (newdecl, olddecl);
1881 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1882 return error_mark_node;
1884 /* We have committed to returning 1 at this point. */
1885 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1887 /* Now that functions must hold information normally held
1888 by field decls, there is extra work to do so that
1889 declaration information does not get destroyed during
1891 if (DECL_VINDEX (olddecl))
1892 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1893 if (DECL_CONTEXT (olddecl))
1894 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1895 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1896 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1897 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1898 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1899 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1900 DECL_FINAL_P (newdecl) |= DECL_FINAL_P (olddecl);
1901 DECL_OVERRIDE_P (newdecl) |= DECL_OVERRIDE_P (olddecl);
1902 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1903 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1904 SET_OVERLOADED_OPERATOR_CODE
1905 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1906 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1908 /* Optionally warn about more than one declaration for the same
1909 name, but don't warn about a function declaration followed by a
1911 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1912 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1913 /* Don't warn about extern decl followed by definition. */
1914 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1915 /* Don't warn about friends, let add_friend take care of it. */
1916 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl))
1917 /* Don't warn about declaration followed by specialization. */
1918 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl)
1919 || DECL_TEMPLATE_SPECIALIZATION (olddecl)))
1921 if (warning_at (DECL_SOURCE_LOCATION (newdecl),
1922 OPT_Wredundant_decls,
1923 "redundant redeclaration of %qD in same scope",
1925 inform (DECL_SOURCE_LOCATION (olddecl),
1926 "previous declaration of %qD", olddecl);
1929 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl)
1930 && DECL_TEMPLATE_SPECIALIZATION (newdecl)))
1932 if (DECL_DELETED_FN (newdecl))
1934 error ("deleted definition of %q+D", newdecl);
1935 inform (DECL_SOURCE_LOCATION (olddecl),
1936 "previous declaration of %qD", olddecl);
1938 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1942 /* Deal with C++: must preserve virtual function table size. */
1943 if (TREE_CODE (olddecl) == TYPE_DECL)
1945 tree newtype = TREE_TYPE (newdecl);
1946 tree oldtype = TREE_TYPE (olddecl);
1948 if (newtype != error_mark_node && oldtype != error_mark_node
1949 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1950 CLASSTYPE_FRIEND_CLASSES (newtype)
1951 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1953 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1956 /* Copy all the DECL_... slots specified in the new decl
1957 except for any that we copy here from the old type. */
1958 DECL_ATTRIBUTES (newdecl)
1959 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1961 if (DECL_DECLARES_FUNCTION_P (olddecl) && DECL_DECLARES_FUNCTION_P (newdecl))
1963 olddecl_friend = DECL_FRIEND_P (olddecl);
1964 hidden_friend = (DECL_ANTICIPATED (olddecl)
1965 && DECL_HIDDEN_FRIEND_P (olddecl)
1966 && newdecl_is_friend);
1969 DECL_ANTICIPATED (olddecl) = 0;
1970 DECL_HIDDEN_FRIEND_P (olddecl) = 0;
1974 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1978 old_result = DECL_TEMPLATE_RESULT (olddecl);
1979 new_result = DECL_TEMPLATE_RESULT (newdecl);
1980 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1981 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1982 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1983 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1985 DECL_ATTRIBUTES (old_result)
1986 = (*targetm.merge_decl_attributes) (old_result, new_result);
1988 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1990 /* Per C++11 8.3.6/4, default arguments cannot be added in later
1991 declarations of a function template. */
1992 if (DECL_SOURCE_LOCATION (newdecl)
1993 != DECL_SOURCE_LOCATION (olddecl))
1994 check_redeclaration_no_default_args (newdecl);
1996 check_default_args (newdecl);
1998 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1999 && DECL_INITIAL (new_result))
2001 if (DECL_INITIAL (old_result))
2002 DECL_UNINLINABLE (old_result) = 1;
2004 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
2005 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
2006 DECL_NOT_REALLY_EXTERN (old_result)
2007 = DECL_NOT_REALLY_EXTERN (new_result);
2008 DECL_INTERFACE_KNOWN (old_result)
2009 = DECL_INTERFACE_KNOWN (new_result);
2010 DECL_DECLARED_INLINE_P (old_result)
2011 = DECL_DECLARED_INLINE_P (new_result);
2012 DECL_DISREGARD_INLINE_LIMITS (old_result)
2013 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
2018 DECL_DECLARED_INLINE_P (old_result)
2019 |= DECL_DECLARED_INLINE_P (new_result);
2020 DECL_DISREGARD_INLINE_LIMITS (old_result)
2021 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
2022 check_redeclaration_exception_specification (newdecl, olddecl);
2026 /* If the new declaration is a definition, update the file and
2027 line information on the declaration, and also make
2028 the old declaration the same definition. */
2029 if (DECL_INITIAL (new_result) != NULL_TREE)
2031 DECL_SOURCE_LOCATION (olddecl)
2032 = DECL_SOURCE_LOCATION (old_result)
2033 = DECL_SOURCE_LOCATION (newdecl);
2034 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
2035 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
2038 DECL_ARGUMENTS (old_result)
2039 = DECL_ARGUMENTS (new_result);
2040 for (parm = DECL_ARGUMENTS (old_result); parm;
2041 parm = DECL_CHAIN (parm))
2042 DECL_CONTEXT (parm) = old_result;
2051 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2052 check_redeclaration_exception_specification (newdecl, olddecl);
2054 /* Automatically handles default parameters. */
2055 tree oldtype = TREE_TYPE (olddecl);
2058 /* For typedefs use the old type, as the new type's DECL_NAME points
2059 at newdecl, which will be ggc_freed. */
2060 if (TREE_CODE (newdecl) == TYPE_DECL)
2062 /* But NEWTYPE might have an attribute, honor that. */
2063 tree tem = TREE_TYPE (newdecl);
2066 if (TYPE_USER_ALIGN (tem))
2068 if (TYPE_ALIGN (tem) > TYPE_ALIGN (newtype))
2069 TYPE_ALIGN (newtype) = TYPE_ALIGN (tem);
2070 TYPE_USER_ALIGN (newtype) = true;
2073 /* And remove the new type from the variants list. */
2074 if (TYPE_NAME (TREE_TYPE (newdecl)) == newdecl)
2076 tree remove = TREE_TYPE (newdecl);
2077 for (tree t = TYPE_MAIN_VARIANT (remove); ;
2078 t = TYPE_NEXT_VARIANT (t))
2079 if (TYPE_NEXT_VARIANT (t) == remove)
2081 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (remove);
2087 /* Merge the data types specified in the two decls. */
2088 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
2090 if (VAR_P (newdecl))
2092 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
2093 /* For already initialized vars, TREE_READONLY could have been
2094 cleared in cp_finish_decl, because the var needs runtime
2095 initialization or destruction. Make sure not to set
2096 TREE_READONLY on it again. */
2097 if (DECL_INITIALIZED_P (olddecl)
2098 && !DECL_EXTERNAL (olddecl)
2099 && !TREE_READONLY (olddecl))
2100 TREE_READONLY (newdecl) = 0;
2101 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
2102 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
2103 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
2104 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
2105 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
2107 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2108 if (DECL_LANG_SPECIFIC (olddecl)
2109 && CP_DECL_THREADPRIVATE_P (olddecl))
2111 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2112 if (!DECL_LANG_SPECIFIC (newdecl))
2113 retrofit_lang_decl (newdecl);
2115 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
2119 /* An explicit specialization of a function template or of a member
2120 function of a class template can be declared transaction_safe
2121 independently of whether the corresponding template entity is declared
2122 transaction_safe. */
2123 if (flag_tm && TREE_CODE (newdecl) == FUNCTION_DECL
2124 && DECL_TEMPLATE_INSTANTIATION (olddecl)
2125 && DECL_TEMPLATE_SPECIALIZATION (newdecl)
2126 && tx_safe_fn_type_p (newtype)
2127 && !tx_safe_fn_type_p (TREE_TYPE (newdecl)))
2128 newtype = tx_unsafe_fn_variant (newtype);
2130 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
2132 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2133 check_default_args (newdecl);
2135 /* Lay the type out, unless already done. */
2136 if (! same_type_p (newtype, oldtype)
2137 && TREE_TYPE (newdecl) != error_mark_node
2138 && !(processing_template_decl && uses_template_parms (newdecl)))
2139 layout_type (TREE_TYPE (newdecl));
2141 if ((VAR_P (newdecl)
2142 || TREE_CODE (newdecl) == PARM_DECL
2143 || TREE_CODE (newdecl) == RESULT_DECL
2144 || TREE_CODE (newdecl) == FIELD_DECL
2145 || TREE_CODE (newdecl) == TYPE_DECL)
2146 && !(processing_template_decl && uses_template_parms (newdecl)))
2147 layout_decl (newdecl, 0);
2149 /* Merge the type qualifiers. */
2150 if (TREE_READONLY (newdecl))
2151 TREE_READONLY (olddecl) = 1;
2152 if (TREE_THIS_VOLATILE (newdecl))
2153 TREE_THIS_VOLATILE (olddecl) = 1;
2154 if (TREE_NOTHROW (newdecl))
2155 TREE_NOTHROW (olddecl) = 1;
2157 /* Merge deprecatedness. */
2158 if (TREE_DEPRECATED (newdecl))
2159 TREE_DEPRECATED (olddecl) = 1;
2161 /* Preserve function specific target and optimization options */
2162 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2164 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2165 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2166 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2167 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2169 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2170 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2171 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2172 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2175 /* Merge the initialization information. */
2176 if (DECL_INITIAL (newdecl) == NULL_TREE
2177 && DECL_INITIAL (olddecl) != NULL_TREE)
2179 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2180 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2181 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2183 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2184 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2188 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2190 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2191 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2192 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2193 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2194 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
2195 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2196 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2197 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2198 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2199 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
2200 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
2201 /* Keep the old RTL. */
2202 COPY_DECL_RTL (olddecl, newdecl);
2204 else if (VAR_P (newdecl)
2205 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
2207 /* Keep the old RTL. We cannot keep the old RTL if the old
2208 declaration was for an incomplete object and the new
2209 declaration is not since many attributes of the RTL will
2211 COPY_DECL_RTL (olddecl, newdecl);
2214 /* If cannot merge, then use the new type and qualifiers,
2215 and don't preserve the old rtl. */
2218 /* Clean out any memory we had of the old declaration. */
2219 tree oldstatic = value_member (olddecl, static_aggregates);
2221 TREE_VALUE (oldstatic) = error_mark_node;
2223 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2224 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
2225 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
2226 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
2229 /* Merge the storage class information. */
2230 merge_weak (newdecl, olddecl);
2232 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
2233 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2234 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
2235 if (! DECL_EXTERNAL (olddecl))
2236 DECL_EXTERNAL (newdecl) = 0;
2237 if (! DECL_COMDAT (olddecl))
2238 DECL_COMDAT (newdecl) = 0;
2240 new_template_info = NULL_TREE;
2241 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
2243 bool new_redefines_gnu_inline = false;
2245 if (new_defines_function
2246 && ((DECL_INTERFACE_KNOWN (olddecl)
2247 && TREE_CODE (olddecl) == FUNCTION_DECL)
2248 || (TREE_CODE (olddecl) == TEMPLATE_DECL
2249 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
2250 == FUNCTION_DECL))))
2254 if (TREE_CODE (fn) == TEMPLATE_DECL)
2255 fn = DECL_TEMPLATE_RESULT (olddecl);
2257 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
2260 if (!new_redefines_gnu_inline)
2262 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
2263 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
2264 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
2266 DECL_TEMPLATE_INSTANTIATED (newdecl)
2267 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
2268 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
2270 /* If the OLDDECL is an instantiation and/or specialization,
2271 then the NEWDECL must be too. But, it may not yet be marked
2272 as such if the caller has created NEWDECL, but has not yet
2273 figured out that it is a redeclaration. */
2274 if (!DECL_USE_TEMPLATE (newdecl))
2275 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
2277 /* Don't really know how much of the language-specific
2278 values we should copy from old to new. */
2279 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2280 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2281 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2282 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2284 if (LANG_DECL_HAS_MIN (newdecl))
2286 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2287 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2288 if (DECL_TEMPLATE_INFO (newdecl))
2290 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2291 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2292 && DECL_TEMPLATE_SPECIALIZATION (newdecl))
2293 /* Remember the presence of explicit specialization args. */
2294 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl))
2295 = TINFO_USED_TEMPLATE_ID (new_template_info);
2297 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2299 /* Only functions have these fields. */
2300 if (DECL_DECLARES_FUNCTION_P (newdecl))
2302 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2303 DECL_BEFRIENDING_CLASSES (newdecl)
2304 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2305 DECL_BEFRIENDING_CLASSES (olddecl));
2306 /* DECL_THUNKS is only valid for virtual functions,
2307 otherwise it is a DECL_FRIEND_CONTEXT. */
2308 if (DECL_VIRTUAL_P (newdecl))
2309 SET_DECL_THUNKS (newdecl, DECL_THUNKS (olddecl));
2311 /* Only variables have this field. */
2312 else if (VAR_P (newdecl)
2313 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2314 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2317 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2321 /* Merge parameter attributes. */
2322 tree oldarg, newarg;
2323 for (oldarg = DECL_ARGUMENTS(olddecl),
2324 newarg = DECL_ARGUMENTS(newdecl);
2326 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2327 DECL_ATTRIBUTES (newarg)
2328 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2329 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2332 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2333 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2335 /* If newdecl is not a specialization, then it is not a
2336 template-related function at all. And that means that we
2337 should have exited above, returning 0. */
2338 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2340 if (DECL_ODR_USED (olddecl))
2341 /* From [temp.expl.spec]:
2343 If a template, a member template or the member of a class
2344 template is explicitly specialized then that
2345 specialization shall be declared before the first use of
2346 that specialization that would cause an implicit
2347 instantiation to take place, in every translation unit in
2348 which such a use occurs. */
2349 error ("explicit specialization of %qD after first use",
2352 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2353 DECL_COMDAT (newdecl) = (TREE_PUBLIC (newdecl)
2354 && DECL_DECLARED_INLINE_P (newdecl));
2356 /* Don't propagate visibility from the template to the
2357 specialization here. We'll do that in determine_visibility if
2359 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2361 /* [temp.expl.spec/14] We don't inline explicit specialization
2362 just because the primary template says so. */
2364 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2365 the always_inline attribute. */
2366 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2367 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2369 if (DECL_DECLARED_INLINE_P (newdecl))
2370 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2372 DECL_ATTRIBUTES (newdecl)
2373 = remove_attribute ("always_inline",
2374 DECL_ATTRIBUTES (newdecl));
2377 else if (new_defines_function && DECL_INITIAL (olddecl))
2379 /* Never inline re-defined extern inline functions.
2380 FIXME: this could be better handled by keeping both
2381 function as separate declarations. */
2382 DECL_UNINLINABLE (newdecl) = 1;
2386 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2387 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2389 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2391 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2392 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2394 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2395 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2396 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2397 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2400 /* Preserve abstractness on cloned [cd]tors. */
2401 DECL_ABSTRACT_P (newdecl) = DECL_ABSTRACT_P (olddecl);
2403 /* Update newdecl's parms to point at olddecl. */
2404 for (parm = DECL_ARGUMENTS (newdecl); parm;
2405 parm = DECL_CHAIN (parm))
2406 DECL_CONTEXT (parm) = olddecl;
2410 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2411 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2412 COPY_DECL_RTL (newdecl, olddecl);
2414 if (! types_match || new_defines_function)
2416 /* These need to be copied so that the names are available.
2417 Note that if the types do match, we'll preserve inline
2418 info and other bits, but if not, we won't. */
2419 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2420 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2422 /* If redeclaring a builtin function, it stays built in
2423 if newdecl is a gnu_inline definition, or if newdecl is just
2425 if (DECL_BUILT_IN (olddecl)
2426 && (new_defines_function ? GNU_INLINE_P (newdecl) : types_match))
2428 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2429 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2430 /* If we're keeping the built-in definition, keep the rtl,
2431 regardless of declaration matches. */
2432 COPY_DECL_RTL (olddecl, newdecl);
2433 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2435 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2438 /* If a compatible prototype of these builtin functions
2439 is seen, assume the runtime implements it with the
2440 expected semantics. */
2441 case BUILT_IN_STPCPY:
2442 if (builtin_decl_explicit_p (fncode))
2443 set_builtin_decl_implicit_p (fncode, true);
2446 if (builtin_decl_explicit_p (fncode))
2447 set_builtin_decl_declared_p (fncode, true);
2452 if (new_defines_function)
2453 /* If defining a function declared with other language
2454 linkage, use the previously declared language linkage. */
2455 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2456 else if (types_match)
2458 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2459 /* Don't clear out the arguments if we're just redeclaring a
2461 if (DECL_ARGUMENTS (olddecl))
2462 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2465 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2466 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2468 /* Now preserve various other info from the definition. */
2469 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2470 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2471 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2472 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2474 /* Warn about conflicting visibility specifications. */
2475 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2476 && DECL_VISIBILITY_SPECIFIED (newdecl)
2477 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2479 if (warning_at (DECL_SOURCE_LOCATION (newdecl), OPT_Wattributes,
2480 "%qD: visibility attribute ignored because it "
2481 "conflicts with previous declaration", newdecl))
2482 inform (DECL_SOURCE_LOCATION (olddecl),
2483 "previous declaration of %qD", olddecl);
2485 /* Choose the declaration which specified visibility. */
2486 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2488 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2489 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2491 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2492 so keep this behavior. */
2493 if (VAR_P (newdecl) && DECL_HAS_INIT_PRIORITY_P (newdecl))
2495 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2496 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2498 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2499 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2501 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2502 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2504 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2505 if (TREE_CODE (newdecl) == FIELD_DECL)
2506 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2508 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2509 with that from NEWDECL below. */
2510 if (DECL_LANG_SPECIFIC (olddecl))
2512 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2513 != DECL_LANG_SPECIFIC (newdecl));
2514 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2517 /* Merge the USED information. */
2518 if (TREE_USED (olddecl))
2519 TREE_USED (newdecl) = 1;
2520 else if (TREE_USED (newdecl))
2521 TREE_USED (olddecl) = 1;
2522 if (VAR_P (newdecl))
2524 if (DECL_READ_P (olddecl))
2525 DECL_READ_P (newdecl) = 1;
2526 else if (DECL_READ_P (newdecl))
2527 DECL_READ_P (olddecl) = 1;
2529 if (DECL_PRESERVE_P (olddecl))
2530 DECL_PRESERVE_P (newdecl) = 1;
2531 else if (DECL_PRESERVE_P (newdecl))
2532 DECL_PRESERVE_P (olddecl) = 1;
2534 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2535 to olddecl and deleted. */
2536 if (TREE_CODE (newdecl) == FUNCTION_DECL
2537 && DECL_FUNCTION_VERSIONED (olddecl))
2539 /* Set the flag for newdecl so that it gets copied to olddecl. */
2540 DECL_FUNCTION_VERSIONED (newdecl) = 1;
2541 /* newdecl will be purged after copying to olddecl and is no longer
2543 cgraph_node::delete_function_version (newdecl);
2546 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2549 struct symtab_node *snode = symtab_node::get (olddecl);
2551 function_size = sizeof (struct tree_decl_common);
2553 memcpy ((char *) olddecl + sizeof (struct tree_common),
2554 (char *) newdecl + sizeof (struct tree_common),
2555 function_size - sizeof (struct tree_common));
2557 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2558 (char *) newdecl + sizeof (struct tree_decl_common),
2559 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2561 /* Preserve symtab node mapping. */
2562 olddecl->decl_with_vis.symtab_node = snode;
2564 if (new_template_info)
2565 /* If newdecl is a template instantiation, it is possible that
2566 the following sequence of events has occurred:
2568 o A friend function was declared in a class template. The
2569 class template was instantiated.
2571 o The instantiation of the friend declaration was
2572 recorded on the instantiation list, and is newdecl.
2574 o Later, however, instantiate_class_template called pushdecl
2575 on the newdecl to perform name injection. But, pushdecl in
2576 turn called duplicate_decls when it discovered that another
2577 declaration of a global function with the same name already
2580 o Here, in duplicate_decls, we decided to clobber newdecl.
2582 If we're going to do that, we'd better make sure that
2583 olddecl, and not newdecl, is on the list of
2584 instantiations so that if we try to do the instantiation
2585 again we won't get the clobbered declaration. */
2586 reregister_specialization (newdecl,
2592 size_t size = tree_code_size (TREE_CODE (newdecl));
2594 memcpy ((char *) olddecl + sizeof (struct tree_common),
2595 (char *) newdecl + sizeof (struct tree_common),
2596 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2597 switch (TREE_CODE (newdecl))
2607 struct symtab_node *snode = NULL;
2610 && (TREE_STATIC (olddecl) || TREE_PUBLIC (olddecl)
2611 || DECL_EXTERNAL (olddecl)))
2612 snode = symtab_node::get (olddecl);
2613 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2614 (char *) newdecl + sizeof (struct tree_decl_common),
2615 size - sizeof (struct tree_decl_common)
2616 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2617 if (VAR_P (newdecl))
2618 olddecl->decl_with_vis.symtab_node = snode;
2622 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2623 (char *) newdecl + sizeof (struct tree_decl_common),
2624 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2625 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2630 if (VAR_OR_FUNCTION_DECL_P (newdecl))
2632 if (DECL_EXTERNAL (olddecl)
2633 || TREE_PUBLIC (olddecl)
2634 || TREE_STATIC (olddecl))
2636 /* Merge the section attribute.
2637 We want to issue an error if the sections conflict but that must be
2638 done later in decl_attributes since we are called before attributes
2640 if (DECL_SECTION_NAME (newdecl) != NULL)
2641 set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl));
2643 if (DECL_ONE_ONLY (newdecl))
2645 struct symtab_node *oldsym, *newsym;
2646 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2647 oldsym = cgraph_node::get_create (olddecl);
2649 oldsym = varpool_node::get_create (olddecl);
2650 newsym = symtab_node::get (newdecl);
2651 oldsym->set_comdat_group (newsym->get_comdat_group ());
2656 && CP_DECL_THREAD_LOCAL_P (newdecl))
2658 CP_DECL_THREAD_LOCAL_P (olddecl) = true;
2659 if (!processing_template_decl)
2660 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2664 DECL_UID (olddecl) = olddecl_uid;
2666 DECL_FRIEND_P (olddecl) = 1;
2669 DECL_ANTICIPATED (olddecl) = 1;
2670 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2673 /* NEWDECL contains the merged attribute lists.
2674 Update OLDDECL to be the same. */
2675 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2677 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2678 so that encode_section_info has a chance to look at the new decl
2679 flags and attributes. */
2680 if (DECL_RTL_SET_P (olddecl)
2681 && (TREE_CODE (olddecl) == FUNCTION_DECL
2683 && TREE_STATIC (olddecl))))
2684 make_decl_rtl (olddecl);
2686 /* The NEWDECL will no longer be needed. Because every out-of-class
2687 declaration of a member results in a call to duplicate_decls,
2688 freeing these nodes represents in a significant savings.
2690 Before releasing the node, be sore to remove function from symbol
2691 table that might have been inserted there to record comdat group.
2692 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2693 structure is shared in between newdecl and oldecl. */
2694 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2695 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2696 if (VAR_OR_FUNCTION_DECL_P (newdecl))
2698 struct symtab_node *snode = symtab_node::get (newdecl);
2703 /* Remove the associated constraints for newdecl, if any, before
2704 reclaiming memory. */
2706 remove_constraints (newdecl);
2713 /* Return zero if the declaration NEWDECL is valid
2714 when the declaration OLDDECL (assumed to be for the same name)
2715 has already been seen.
2716 Otherwise return an error message format string with a %s
2717 where the identifier should go. */
2720 redeclaration_error_message (tree newdecl, tree olddecl)
2722 if (TREE_CODE (newdecl) == TYPE_DECL)
2724 /* Because C++ can put things into name space for free,
2725 constructs like "typedef struct foo { ... } foo"
2726 would look like an erroneous redeclaration. */
2727 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2730 return G_("redefinition of %q#D");
2732 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2734 /* If this is a pure function, its olddecl will actually be
2735 the original initialization to `0' (which we force to call
2736 abort()). Don't complain about redefinition in this case. */
2737 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2738 && DECL_INITIAL (olddecl) == NULL_TREE)
2741 /* If both functions come from different namespaces, this is not
2742 a redeclaration - this is a conflict with a used function. */
2743 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2744 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2745 && ! decls_match (olddecl, newdecl))
2746 return G_("%qD conflicts with used function");
2748 /* We'll complain about linkage mismatches in
2749 warn_extern_redeclared_static. */
2751 /* Defining the same name twice is no good. */
2752 if (DECL_INITIAL (olddecl) != NULL_TREE
2753 && DECL_INITIAL (newdecl) != NULL_TREE)
2755 if (DECL_NAME (olddecl) == NULL_TREE)
2756 return G_("%q#D not declared in class");
2757 else if (!GNU_INLINE_P (olddecl)
2758 || GNU_INLINE_P (newdecl))
2759 return G_("redefinition of %q#D");
2762 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2764 bool olda = GNU_INLINE_P (olddecl);
2765 bool newa = GNU_INLINE_P (newdecl);
2770 return G_("%q+D redeclared inline with "
2771 "%<gnu_inline%> attribute");
2773 return G_("%q+D redeclared inline without "
2774 "%<gnu_inline%> attribute");
2778 check_abi_tag_redeclaration
2779 (olddecl, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl)),
2780 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl)));
2784 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2788 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2790 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2791 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2792 return G_("redefinition of %q#D");
2796 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2797 || (DECL_TEMPLATE_RESULT (newdecl)
2798 == DECL_TEMPLATE_RESULT (olddecl)))
2801 nt = DECL_TEMPLATE_RESULT (newdecl);
2802 if (DECL_TEMPLATE_INFO (nt))
2803 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2804 ot = DECL_TEMPLATE_RESULT (olddecl);
2805 if (DECL_TEMPLATE_INFO (ot))
2806 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2807 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2808 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2809 return G_("redefinition of %q#D");
2811 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2813 bool olda = GNU_INLINE_P (ot);
2814 bool newa = GNU_INLINE_P (nt);
2819 return G_("%q+D redeclared inline with "
2820 "%<gnu_inline%> attribute");
2822 return G_("%q+D redeclared inline without "
2823 "%<gnu_inline%> attribute");
2827 /* Core issue #226 (C++0x):
2829 If a friend function template declaration specifies a
2830 default template-argument, that declaration shall be a
2831 definition and shall be the only declaration of the
2832 function template in the translation unit. */
2833 if ((cxx_dialect != cxx98)
2834 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2835 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2836 /*is_primary=*/true,
2837 /*is_partial=*/false,
2838 /*is_friend_decl=*/2))
2839 return G_("redeclaration of friend %q#D "
2840 "may not have default template arguments");
2844 else if (VAR_P (newdecl)
2845 && CP_DECL_THREAD_LOCAL_P (newdecl) != CP_DECL_THREAD_LOCAL_P (olddecl)
2846 && (! DECL_LANG_SPECIFIC (olddecl)
2847 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2848 || CP_DECL_THREAD_LOCAL_P (newdecl)))
2850 /* Only variables can be thread-local, and all declarations must
2851 agree on this property. */
2852 if (CP_DECL_THREAD_LOCAL_P (newdecl))
2853 return G_("thread-local declaration of %q#D follows "
2854 "non-thread-local declaration");
2856 return G_("non-thread-local declaration of %q#D follows "
2857 "thread-local declaration");
2859 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2861 /* The objects have been declared at namespace scope. If either
2862 is a member of an anonymous union, then this is an invalid
2863 redeclaration. For example:
2869 if ((VAR_P (newdecl) && DECL_ANON_UNION_VAR_P (newdecl))
2870 || (VAR_P (olddecl) && DECL_ANON_UNION_VAR_P (olddecl)))
2871 return G_("redeclaration of %q#D");
2872 /* If at least one declaration is a reference, there is no
2873 conflict. For example:
2879 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2881 /* Reject two definitions. */
2882 return G_("redefinition of %q#D");
2886 /* Objects declared with block scope: */
2887 /* Reject two definitions, and reject a definition
2888 together with an external reference. */
2889 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2890 return G_("redeclaration of %q#D");
2895 /* Hash and equality functions for the named_label table. */
2898 named_label_hasher::hash (named_label_entry *ent)
2900 return DECL_UID (ent->label_decl);
2904 named_label_hasher::equal (named_label_entry *a, named_label_entry *b)
2906 return a->label_decl == b->label_decl;
2909 /* Create a new label, named ID. */
2912 make_label_decl (tree id, int local_p)
2914 struct named_label_entry *ent;
2917 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2919 DECL_CONTEXT (decl) = current_function_decl;
2920 DECL_MODE (decl) = VOIDmode;
2921 C_DECLARED_LABEL_FLAG (decl) = local_p;
2923 /* Say where one reference is to the label, for the sake of the
2924 error if it is not defined. */
2925 DECL_SOURCE_LOCATION (decl) = input_location;
2927 /* Record the fact that this identifier is bound to this label. */
2928 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2930 /* Create the label htab for the function on demand. */
2932 named_labels = hash_table<named_label_hasher>::create_ggc (13);
2934 /* Record this label on the list of labels used in this function.
2935 We do this before calling make_label_decl so that we get the
2936 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2937 ent = ggc_cleared_alloc<named_label_entry> ();
2938 ent->label_decl = decl;
2940 named_label_entry **slot = named_labels->find_slot (ent, INSERT);
2941 gcc_assert (*slot == NULL);
2947 /* Look for a label named ID in the current function. If one cannot
2948 be found, create one. (We keep track of used, but undefined,
2949 labels, and complain about them at the end of a function.) */
2952 lookup_label_1 (tree id)
2956 /* You can't use labels at global scope. */
2957 if (current_function_decl == NULL_TREE)
2959 error ("label %qE referenced outside of any function", id);
2963 /* See if we've already got this label. */
2964 decl = IDENTIFIER_LABEL_VALUE (id);
2965 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2968 decl = make_label_decl (id, /*local_p=*/0);
2972 /* Wrapper for lookup_label_1. */
2975 lookup_label (tree id)
2978 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2979 ret = lookup_label_1 (id);
2980 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2984 /* Declare a local label named ID. */
2987 declare_local_label (tree id)
2990 cp_label_binding bind;
2992 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2993 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2994 bind.prev_value = IDENTIFIER_LABEL_VALUE (id);
2996 decl = make_label_decl (id, /*local_p=*/1);
2998 vec_safe_push (current_binding_level->shadowed_labels, bind);
3003 /* Returns nonzero if it is ill-formed to jump past the declaration of
3004 DECL. Returns 2 if it's also a real problem. */
3007 decl_jump_unsafe (tree decl)
3009 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3010 with automatic storage duration is not in scope to a point where it is
3011 in scope is ill-formed unless the variable has scalar type, class type
3012 with a trivial default constructor and a trivial destructor, a
3013 cv-qualified version of one of these types, or an array of one of the
3014 preceding types and is declared without an initializer (8.5). */
3015 tree type = TREE_TYPE (decl);
3017 if (!VAR_P (decl) || TREE_STATIC (decl)
3018 || type == error_mark_node)
3021 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl)
3022 || variably_modified_type_p (type, NULL_TREE))
3025 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3031 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3035 identify_goto (tree decl, location_t loc, const location_t *locus,
3036 diagnostic_t diag_kind)
3039 = (decl ? emit_diagnostic (diag_kind, loc, 0, "jump to label %qD", decl)
3040 : emit_diagnostic (diag_kind, loc, 0, "jump to case label"));
3041 if (complained && locus)
3042 inform (*locus, " from here");
3046 /* Check that a single previously seen jump to a newly defined label
3047 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3048 the jump context; NAMES are the names in scope in LEVEL at the jump
3049 context; LOCUS is the source position of the jump or 0. Returns
3050 true if all is well. */
3053 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
3054 bool exited_omp, const location_t *locus)
3056 cp_binding_level *b;
3057 bool complained = false;
3059 bool saw_eh = false, saw_omp = false, saw_tm = false;
3063 complained = identify_goto (decl, input_location, locus, DK_ERROR);
3065 inform (input_location, " exits OpenMP structured block");
3070 for (b = current_binding_level; b ; b = b->level_chain)
3072 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
3074 for (new_decls = b->names; new_decls != old_decls;
3075 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
3076 : TREE_CHAIN (new_decls)))
3078 int problem = decl_jump_unsafe (new_decls);
3084 complained = identify_goto (decl, input_location, locus,
3091 inform (DECL_SOURCE_LOCATION (new_decls),
3092 " crosses initialization of %q#D", new_decls);
3094 inform (DECL_SOURCE_LOCATION (new_decls),
3095 " enters scope of %q#D which has "
3096 "non-trivial destructor", new_decls);
3102 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
3106 complained = identify_goto (decl, input_location, locus,
3112 if (b->kind == sk_try)
3113 inform (input_location, " enters try block");
3115 inform (input_location, " enters catch block");
3119 if (b->kind == sk_omp && !saw_omp)
3123 complained = identify_goto (decl, input_location, locus,
3128 inform (input_location, " enters OpenMP structured block");
3131 if (b->kind == sk_transaction && !saw_tm)
3135 complained = identify_goto (decl, input_location, locus,
3140 inform (input_location,
3141 " enters synchronized or atomic statement");
3150 check_previous_goto (tree decl, struct named_label_use_entry *use)
3152 check_previous_goto_1 (decl, use->binding_level,
3153 use->names_in_scope, use->in_omp_scope,
3154 &use->o_goto_locus);
3158 check_switch_goto (cp_binding_level* level)
3160 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
3163 /* Check that a new jump to a label DECL is OK. Called by
3164 finish_goto_stmt. */
3167 check_goto (tree decl)
3169 struct named_label_entry *ent, dummy;
3170 bool saw_catch = false, complained = false;
3175 /* We can't know where a computed goto is jumping.
3176 So we assume that it's OK. */
3177 if (TREE_CODE (decl) != LABEL_DECL)
3180 /* We didn't record any information about this label when we created it,
3181 and there's not much point since it's trivial to analyze as a return. */
3182 if (decl == cdtor_label)
3185 dummy.label_decl = decl;
3186 ent = named_labels->find (&dummy);
3187 gcc_assert (ent != NULL);
3189 /* If the label hasn't been defined yet, defer checking. */
3190 if (! DECL_INITIAL (decl))
3192 struct named_label_use_entry *new_use;
3194 /* Don't bother creating another use if the last goto had the
3195 same data, and will therefore create the same set of errors. */
3197 && ent->uses->names_in_scope == current_binding_level->names)
3200 new_use = ggc_alloc<named_label_use_entry> ();
3201 new_use->binding_level = current_binding_level;
3202 new_use->names_in_scope = current_binding_level->names;
3203 new_use->o_goto_locus = input_location;
3204 new_use->in_omp_scope = false;
3206 new_use->next = ent->uses;
3207 ent->uses = new_use;
3211 if (ent->in_try_scope || ent->in_catch_scope || ent->in_transaction_scope
3212 || ent->in_omp_scope || !vec_safe_is_empty (ent->bad_decls))
3214 diagnostic_t diag_kind = DK_PERMERROR;
3215 if (ent->in_try_scope || ent->in_catch_scope
3216 || ent->in_transaction_scope || ent->in_omp_scope)
3217 diag_kind = DK_ERROR;
3218 complained = identify_goto (decl, DECL_SOURCE_LOCATION (decl),
3219 &input_location, diag_kind);
3220 identified = 1 + (diag_kind == DK_ERROR);
3223 FOR_EACH_VEC_SAFE_ELT (ent->bad_decls, ix, bad)
3225 int u = decl_jump_unsafe (bad);
3227 if (u > 1 && DECL_ARTIFICIAL (bad))
3229 /* Can't skip init of __exception_info. */
3230 if (identified == 1)
3232 complained = identify_goto (decl, DECL_SOURCE_LOCATION (decl),
3233 &input_location, DK_ERROR);
3237 inform (DECL_SOURCE_LOCATION (bad), " enters catch block");
3240 else if (complained)
3243 inform (DECL_SOURCE_LOCATION (bad),
3244 " skips initialization of %q#D", bad);
3246 inform (DECL_SOURCE_LOCATION (bad),
3247 " enters scope of %q#D which has "
3248 "non-trivial destructor", bad);
3254 if (ent->in_try_scope)
3255 inform (input_location, " enters try block");
3256 else if (ent->in_catch_scope && !saw_catch)
3257 inform (input_location, " enters catch block");
3258 else if (ent->in_transaction_scope)
3259 inform (input_location, " enters synchronized or atomic statement");
3262 if (ent->in_omp_scope)
3265 inform (input_location, " enters OpenMP structured block");
3267 else if (flag_openmp)
3269 cp_binding_level *b;
3270 for (b = current_binding_level; b ; b = b->level_chain)
3272 if (b == ent->binding_level)
3274 if (b->kind == sk_omp)
3278 complained = identify_goto (decl,
3279 DECL_SOURCE_LOCATION (decl),
3280 &input_location, DK_ERROR);
3284 inform (input_location, " exits OpenMP structured block");
3291 /* Check that a return is ok wrt OpenMP structured blocks.
3292 Called by finish_return_stmt. Returns true if all is well. */
3295 check_omp_return (void)
3297 cp_binding_level *b;
3298 for (b = current_binding_level; b ; b = b->level_chain)
3299 if (b->kind == sk_omp)
3301 error ("invalid exit from OpenMP structured block");
3304 else if (b->kind == sk_function_parms)
3309 /* Define a label, specifying the location in the source file.
3310 Return the LABEL_DECL node for the label. */
3313 define_label_1 (location_t location, tree name)
3315 struct named_label_entry *ent, dummy;
3316 cp_binding_level *p;
3319 decl = lookup_label (name);
3321 dummy.label_decl = decl;
3322 ent = named_labels->find (&dummy);
3323 gcc_assert (ent != NULL);
3325 /* After labels, make any new cleanups in the function go into their
3326 own new (temporary) binding contour. */
3327 for (p = current_binding_level;
3328 p->kind != sk_function_parms;
3330 p->more_cleanups_ok = 0;
3332 if (name == get_identifier ("wchar_t"))
3333 permerror (input_location, "label named wchar_t");
3335 if (DECL_INITIAL (decl) != NULL_TREE)
3337 error ("duplicate label %qD", decl);
3338 return error_mark_node;
3342 struct named_label_use_entry *use;
3344 /* Mark label as having been defined. */
3345 DECL_INITIAL (decl) = error_mark_node;
3346 /* Say where in the source. */
3347 DECL_SOURCE_LOCATION (decl) = location;
3349 ent->binding_level = current_binding_level;
3350 ent->names_in_scope = current_binding_level->names;
3352 for (use = ent->uses; use ; use = use->next)
3353 check_previous_goto (decl, use);
3360 /* Wrapper for define_label_1. */
3363 define_label (location_t location, tree name)
3366 bool running = timevar_cond_start (TV_NAME_LOOKUP);
3367 ret = define_label_1 (location, name);
3368 timevar_cond_stop (TV_NAME_LOOKUP, running);
3375 cp_binding_level *level;
3376 struct cp_switch *next;
3377 /* The SWITCH_STMT being built. */
3379 /* A splay-tree mapping the low element of a case range to the high
3380 element, or NULL_TREE if there is no high element. Used to
3381 determine whether or not a new case label duplicates an old case
3382 label. We need a tree, rather than simply a hash table, because
3383 of the GNU case range extension. */
3385 /* Remember whether there was a case value that is outside the
3386 range of the original type of the controlling expression. */
3387 bool outside_range_p;
3390 /* A stack of the currently active switch statements. The innermost
3391 switch statement is on the top of the stack. There is no need to
3392 mark the stack for garbage collection because it is only active
3393 during the processing of the body of a function, and we never
3394 collect at that point. */
3396 static struct cp_switch *switch_stack;
3398 /* Called right after a switch-statement condition is parsed.
3399 SWITCH_STMT is the switch statement being parsed. */
3402 push_switch (tree switch_stmt)
3404 struct cp_switch *p = XNEW (struct cp_switch);
3405 p->level = current_binding_level;
3406 p->next = switch_stack;
3407 p->switch_stmt = switch_stmt;
3408 p->cases = splay_tree_new (case_compare, NULL, NULL);
3409 p->outside_range_p = false;
3416 struct cp_switch *cs = switch_stack;
3417 location_t switch_location;
3419 /* Emit warnings as needed. */
3420 switch_location = EXPR_LOC_OR_LOC (cs->switch_stmt, input_location);
3421 const bool bool_cond_p
3422 = (SWITCH_STMT_TYPE (cs->switch_stmt)
3423 && TREE_CODE (SWITCH_STMT_TYPE (cs->switch_stmt)) == BOOLEAN_TYPE);
3424 if (!processing_template_decl)
3425 c_do_switch_warnings (cs->cases, switch_location,
3426 SWITCH_STMT_TYPE (cs->switch_stmt),
3427 SWITCH_STMT_COND (cs->switch_stmt),
3428 bool_cond_p, cs->outside_range_p);
3430 splay_tree_delete (cs->cases);
3431 switch_stack = switch_stack->next;
3435 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3436 condition. Note that if TYPE and VALUE are already integral we don't
3437 really do the conversion because the language-independent
3438 warning/optimization code will work better that way. */
3441 case_conversion (tree type, tree value)
3443 if (value == NULL_TREE)
3446 if (cxx_dialect >= cxx11
3447 && (SCOPED_ENUM_P (type)
3448 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3450 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3451 type = type_promotes_to (type);
3452 value = (perform_implicit_conversion_flags
3453 (type, value, tf_warning_or_error,
3454 LOOKUP_IMPLICIT | LOOKUP_NO_NON_INTEGRAL));
3456 return cxx_constant_value (value);
3459 /* Note that we've seen a definition of a case label, and complain if this
3460 is a bad place for one. */
3463 finish_case_label (location_t loc, tree low_value, tree high_value)
3466 cp_binding_level *p;
3469 if (processing_template_decl)
3473 /* For templates, just add the case label; we'll do semantic
3474 analysis at instantiation-time. */
3475 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3476 return add_stmt (build_case_label (low_value, high_value, label));
3479 /* Find the condition on which this switch statement depends. */
3480 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3481 if (cond && TREE_CODE (cond) == TREE_LIST)
3482 cond = TREE_VALUE (cond);
3484 if (!check_switch_goto (switch_stack->level))
3485 return error_mark_node;
3487 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3489 low_value = case_conversion (type, low_value);
3490 high_value = case_conversion (type, high_value);
3492 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3493 low_value, high_value,
3494 &switch_stack->outside_range_p);
3496 /* After labels, make any new cleanups in the function go into their
3497 own new (temporary) binding contour. */
3498 for (p = current_binding_level;
3499 p->kind != sk_function_parms;
3501 p->more_cleanups_ok = 0;
3506 struct typename_info {
3514 struct typename_hasher : ggc_ptr_hash<tree_node>
3516 typedef typename_info *compare_type;
3518 /* Hash a TYPENAME_TYPE. */
3525 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3526 ^ htab_hash_pointer (TYPE_IDENTIFIER (t)));
3531 /* Compare two TYPENAME_TYPEs. */
3534 equal (tree t1, const typename_info *t2)
3536 return (TYPE_IDENTIFIER (t1) == t2->name
3537 && TYPE_CONTEXT (t1) == t2->scope
3538 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3539 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3540 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3544 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3545 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3547 Returns the new TYPENAME_TYPE. */
3549 static GTY (()) hash_table<typename_hasher> *typename_htab;
3552 build_typename_type (tree context, tree name, tree fullname,
3553 enum tag_types tag_type)
3561 if (typename_htab == NULL)
3562 typename_htab = hash_table<typename_hasher>::create_ggc (61);
3564 ti.scope = FROB_CONTEXT (context);
3566 ti.template_id = fullname;
3567 ti.enum_p = tag_type == enum_type;
3568 ti.class_p = (tag_type == class_type
3569 || tag_type == record_type
3570 || tag_type == union_type);
3571 hash = (htab_hash_pointer (ti.scope)
3572 ^ htab_hash_pointer (ti.name));
3574 /* See if we already have this type. */
3575 e = typename_htab->find_slot_with_hash (&ti, hash, INSERT);
3580 /* Build the TYPENAME_TYPE. */
3581 t = cxx_make_type (TYPENAME_TYPE);
3582 TYPE_CONTEXT (t) = ti.scope;
3583 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3584 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3585 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3587 /* Build the corresponding TYPE_DECL. */
3588 d = build_decl (input_location, TYPE_DECL, name, t);
3589 TYPE_NAME (TREE_TYPE (d)) = d;
3590 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3591 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3592 DECL_ARTIFICIAL (d) = 1;
3594 /* Store it in the hash table. */
3597 /* TYPENAME_TYPEs must always be compared structurally, because
3598 they may or may not resolve down to another type depending on
3599 the currently open classes. */
3600 SET_TYPE_STRUCTURAL_EQUALITY (t);
3606 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3607 provided to name the type. Returns an appropriate type, unless an
3608 error occurs, in which case error_mark_node is returned. If we
3609 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3610 return that, rather than the _TYPE it corresponds to, in other
3611 cases we look through the type decl. If TF_ERROR is set, complain
3612 about errors, otherwise be quiet. */
3615 make_typename_type (tree context, tree name, enum tag_types tag_type,
3616 tsubst_flags_t complain)
3622 if (name == error_mark_node
3623 || context == NULL_TREE
3624 || context == error_mark_node)
3625 return error_mark_node;
3629 if (!(TYPE_LANG_SPECIFIC (name)
3630 && (CLASSTYPE_IS_TEMPLATE (name)
3631 || CLASSTYPE_USE_TEMPLATE (name))))
3632 name = TYPE_IDENTIFIER (name);
3634 /* Create a TEMPLATE_ID_EXPR for the type. */
3635 name = build_nt (TEMPLATE_ID_EXPR,
3636 CLASSTYPE_TI_TEMPLATE (name),
3637 CLASSTYPE_TI_ARGS (name));
3639 else if (TREE_CODE (name) == TYPE_DECL)
3640 name = DECL_NAME (name);
3644 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3646 name = TREE_OPERAND (name, 0);
3647 if (DECL_TYPE_TEMPLATE_P (name))
3648 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3649 if (TREE_CODE (name) != IDENTIFIER_NODE)
3651 if (complain & tf_error)
3652 error ("%qD is not a type", name);
3653 return error_mark_node;
3656 if (TREE_CODE (name) == TEMPLATE_DECL)
3658 if (complain & tf_error)
3659 error ("%qD used without template parameters", name);
3660 return error_mark_node;
3662 gcc_assert (identifier_p (name));
3663 gcc_assert (TYPE_P (context));
3665 if (!MAYBE_CLASS_TYPE_P (context))
3667 if (complain & tf_error)
3668 error ("%q#T is not a class", context);
3669 return error_mark_node;
3672 /* When the CONTEXT is a dependent type, NAME could refer to a
3673 dependent base class of CONTEXT. But look inside it anyway
3674 if CONTEXT is a currently open scope, in case it refers to a
3675 member of the current instantiation or a non-dependent base;
3676 lookup will stop when we hit a dependent base. */
3677 if (!dependent_scope_p (context))
3678 /* We should only set WANT_TYPE when we're a nested typename type.
3679 Then we can give better diagnostics if we find a non-type. */
3680 t = lookup_field (context, name, 2, /*want_type=*/true);
3684 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3685 return build_typename_type (context, name, fullname, tag_type);
3687 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3691 if (complain & tf_error)
3692 error (want_template ? G_("no class template named %q#T in %q#T")
3693 : G_("no type named %q#T in %q#T"), name, context);
3694 return error_mark_node;
3697 /* Pull out the template from an injected-class-name (or multiple). */
3699 t = maybe_get_template_decl_from_type_decl (t);
3701 if (TREE_CODE (t) == TREE_LIST)
3703 if (complain & tf_error)
3705 error ("lookup of %qT in %qT is ambiguous", name, context);
3706 print_candidates (t);
3708 return error_mark_node;
3711 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3713 if (complain & tf_error)
3714 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3716 return error_mark_node;
3718 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3720 if (complain & tf_error)
3721 error ("%<typename %T::%D%> names %q#T, which is not a type",
3723 return error_mark_node;
3726 if (!perform_or_defer_access_check (TYPE_BINFO (context), t, t, complain))
3727 return error_mark_node;
3729 /* If we are currently parsing a template and if T is a typedef accessed
3730 through CONTEXT then we need to remember and check access of T at
3731 template instantiation time. */
3732 add_typedef_to_current_template_for_access_check (t, context, input_location);
3735 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3737 /*entering_scope=*/0,
3738 complain | tf_user);
3740 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3743 maybe_record_typedef_use (t);
3748 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3749 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3750 in which case error_mark_node is returned.
3752 If PARM_LIST is non-NULL, also make sure that the template parameter
3753 list of TEMPLATE_DECL matches.
3755 If COMPLAIN zero, don't complain about any errors that occur. */
3758 make_unbound_class_template (tree context, tree name, tree parm_list,
3759 tsubst_flags_t complain)
3765 name = TYPE_IDENTIFIER (name);
3766 else if (DECL_P (name))
3767 name = DECL_NAME (name);
3768 gcc_assert (identifier_p (name));
3770 if (!dependent_type_p (context)
3771 || currently_open_class (context))
3773 tree tmpl = NULL_TREE;
3775 if (MAYBE_CLASS_TYPE_P (context))
3776 tmpl = lookup_field (context, name, 0, false);
3778 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3779 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3781 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3783 if (complain & tf_error)
3784 error ("no class template named %q#T in %q#T", name, context);
3785 return error_mark_node;
3789 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3791 if (complain & tf_error)
3793 error ("template parameters do not match template %qD", tmpl);
3794 inform (DECL_SOURCE_LOCATION (tmpl),
3795 "%qD declared here", tmpl);
3797 return error_mark_node;
3800 if (!perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl,
3802 return error_mark_node;
3807 /* Build the UNBOUND_CLASS_TEMPLATE. */
3808 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3809 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3810 TREE_TYPE (t) = NULL_TREE;
3811 SET_TYPE_STRUCTURAL_EQUALITY (t);
3813 /* Build the corresponding TEMPLATE_DECL. */
3814 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3815 TYPE_NAME (TREE_TYPE (d)) = d;
3816 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3817 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3818 DECL_ARTIFICIAL (d) = 1;
3819 DECL_TEMPLATE_PARMS (d) = parm_list;
3826 /* Push the declarations of builtin types into the namespace.
3827 RID_INDEX is the index of the builtin type in the array
3828 RID_POINTERS. NAME is the name used when looking up the builtin
3829 type. TYPE is the _TYPE node for the builtin type. */
3832 record_builtin_type (enum rid rid_index,
3836 tree rname = NULL_TREE, tname = NULL_TREE;
3837 tree tdecl = NULL_TREE;
3839 if ((int) rid_index < (int) RID_MAX)
3840 rname = ridpointers[(int) rid_index];
3842 tname = get_identifier (name);
3844 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3845 eliminated. Built-in types should not be looked up name; their
3846 names are keywords that the parser can recognize. However, there
3847 is code in c-common.c that uses identifier_global_value to look
3848 up built-in types by name. */
3851 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3852 DECL_ARTIFICIAL (tdecl) = 1;
3853 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3859 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3860 DECL_ARTIFICIAL (tdecl) = 1;
3862 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3865 if (!TYPE_NAME (type))
3866 TYPE_NAME (type) = tdecl;
3869 debug_hooks->type_decl (tdecl, 0);
3872 /* Record one of the standard Java types.
3873 * Declare it as having the given NAME.
3874 * If SIZE > 0, it is the size of one of the integral types;
3875 * otherwise it is the negative of the size of one of the other types. */
3878 record_builtin_java_type (const char* name, int size)
3883 type = build_nonstandard_integer_type (size, 0);
3884 type = build_distinct_type_copy (type);
3886 else if (size > -32)
3889 /* "__java_char" or ""__java_boolean". */
3890 type = build_nonstandard_integer_type (-size, 1);
3891 type = build_distinct_type_copy (type);
3892 /* Get the signed type cached and attached to the unsigned type,
3893 so it doesn't get garbage-collected at "random" times,
3894 causing potential codegen differences out of different UIDs
3895 and different alias set numbers. */
3896 stype = build_nonstandard_integer_type (-size, 0);
3897 stype = build_distinct_type_copy (stype);
3898 TREE_CHAIN (type) = stype;
3899 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3902 { /* "__java_float" or ""__java_double". */
3903 type = make_node (REAL_TYPE);
3904 TYPE_PRECISION (type) = - size;
3907 record_builtin_type (RID_MAX, name, type);
3908 decl = TYPE_NAME (type);
3910 /* Suppress generate debug symbol entries for these types,
3911 since for normal C++ they are just clutter.
3912 However, push_lang_context undoes this if extern "Java" is seen. */
3913 DECL_IGNORED_P (decl) = 1;
3915 TYPE_FOR_JAVA (type) = 1;
3919 /* Push a type into the namespace so that the back ends ignore it. */
3922 record_unknown_type (tree type, const char* name)
3924 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3925 TYPE_DECL, get_identifier (name), type));
3926 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3927 DECL_IGNORED_P (decl) = 1;
3928 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3929 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3930 TYPE_ALIGN (type) = 1;
3931 TYPE_USER_ALIGN (type) = 0;
3932 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3935 /* A string for which we should create an IDENTIFIER_NODE at
3938 struct predefined_identifier
3940 /* The name of the identifier. */
3941 const char *const name;
3942 /* The place where the IDENTIFIER_NODE should be stored. */
3944 /* Nonzero if this is the name of a constructor or destructor. */
3945 const int ctor_or_dtor_p;
3948 /* Create all the predefined identifiers. */
3951 initialize_predefined_identifiers (void)
3953 const predefined_identifier *pid;
3955 /* A table of identifiers to create at startup. */
3956 static const predefined_identifier predefined_identifiers[] = {
3957 { "C++", &lang_name_cplusplus, 0 },
3958 { "C", &lang_name_c, 0 },
3959 { "Java", &lang_name_java, 0 },
3960 /* Some of these names have a trailing space so that it is
3961 impossible for them to conflict with names written by users. */
3962 { "__ct ", &ctor_identifier, 1 },
3963 { "__base_ctor ", &base_ctor_identifier, 1 },
3964 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3965 { "__dt ", &dtor_identifier, 1 },
3966 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3967 { "__base_dtor ", &base_dtor_identifier, 1 },
3968 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3969 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3970 { "nelts", &nelts_identifier, 0 },
3971 { THIS_NAME, &this_identifier, 0 },
3972 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3973 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3974 { "_vptr", &vptr_identifier, 0 },
3975 { "__vtt_parm", &vtt_parm_identifier, 0 },
3976 { "::", &global_scope_name, 0 },
3977 { "std", &std_identifier, 0 },
3981 for (pid = predefined_identifiers; pid->name; ++pid)
3983 *pid->node = get_identifier (pid->name);
3984 if (pid->ctor_or_dtor_p)
3985 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3989 /* Create the predefined scalar types of C,
3990 and some nodes representing standard constants (0, 1, (void *)0).
3991 Initialize the global binding level.
3992 Make definitions for built-in primitive functions. */
3995 cxx_init_decl_processing (void)
3998 tree void_ftype_ptr;
4000 /* Create all the identifiers we need. */
4001 initialize_predefined_identifiers ();
4003 /* Create the global variables. */
4004 push_to_top_level ();
4006 current_function_decl = NULL_TREE;
4007 current_binding_level = NULL;
4008 /* Enter the global namespace. */
4009 gcc_assert (global_namespace == NULL_TREE);
4010 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
4012 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
4013 debug_hooks->register_main_translation_unit
4014 (DECL_CONTEXT (global_namespace));
4015 TREE_PUBLIC (global_namespace) = 1;
4016 begin_scope (sk_namespace, global_namespace);
4018 if (flag_visibility_ms_compat)
4019 default_visibility = VISIBILITY_HIDDEN;
4022 current_lang_name = lang_name_c;
4024 /* Create the `std' namespace. */
4025 push_namespace (std_identifier);
4026 std_node = current_namespace;
4029 c_common_nodes_and_builtins ();
4031 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
4032 java_short_type_node = record_builtin_java_type ("__java_short", 16);
4033 java_int_type_node = record_builtin_java_type ("__java_int", 32);
4034 java_long_type_node = record_builtin_java_type ("__java_long", 64);
4035 java_float_type_node = record_builtin_java_type ("__java_float", -32);
4036 java_double_type_node = record_builtin_java_type ("__java_double", -64);
4037 java_char_type_node = record_builtin_java_type ("__java_char", -16);
4038 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
4040 integer_two_node = build_int_cst (NULL_TREE, 2);
4042 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
4043 truthvalue_type_node = boolean_type_node;
4044 truthvalue_false_node = boolean_false_node;
4045 truthvalue_true_node = boolean_true_node;
4047 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
4048 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
4049 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
4052 record_builtin_type (RID_MAX, NULL, string_type_node);
4055 delta_type_node = ptrdiff_type_node;
4056 vtable_index_type = ptrdiff_type_node;
4058 vtt_parm_type = build_pointer_type (const_ptr_type_node);
4059 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
4060 void_ftype_ptr = build_function_type_list (void_type_node,
4061 ptr_type_node, NULL_TREE);
4063 = build_exception_variant (void_ftype_ptr, empty_except_spec);
4065 /* C++ extensions */
4067 unknown_type_node = make_node (LANG_TYPE);
4068 record_unknown_type (unknown_type_node, "unknown type");
4070 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4071 TREE_TYPE (unknown_type_node) = unknown_type_node;
4073 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4075 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
4076 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
4078 init_list_type_node = make_node (LANG_TYPE);
4079 record_unknown_type (init_list_type_node, "init list");
4082 /* Make sure we get a unique function type, so we can give
4083 its pointer type a name. (This wins for gdb.) */
4084 tree vfunc_type = make_node (FUNCTION_TYPE);
4085 TREE_TYPE (vfunc_type) = integer_type_node;
4086 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
4087 layout_type (vfunc_type);
4089 vtable_entry_type = build_pointer_type (vfunc_type);
4091 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
4094 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
4095 layout_type (vtbl_type_node);
4096 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
4097 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
4098 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
4099 layout_type (vtbl_ptr_type_node);
4100 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
4102 push_namespace (get_identifier ("__cxxabiv1"));
4103 abi_node = current_namespace;
4106 global_type_node = make_node (LANG_TYPE);
4107 record_unknown_type (global_type_node, "global type");
4110 current_lang_name = lang_name_cplusplus;
4113 tree newattrs, extvisattr;
4114 tree newtype, deltype;
4115 tree ptr_ftype_sizetype;
4119 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
4120 if (cxx_dialect == cxx98)
4123 tree bad_alloc_type_node;
4124 tree bad_alloc_decl;
4126 push_namespace (std_identifier);
4127 bad_alloc_id = get_identifier ("bad_alloc");
4128 bad_alloc_type_node = make_class_type (RECORD_TYPE);
4129 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
4131 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
4132 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
4136 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
4139 new_eh_spec = noexcept_false_spec;
4141 /* Ensure attribs.c is initialized. */
4144 /* Ensure constraint.cc is initialized. */
4145 init_constraint_processing ();
4147 extvisattr = build_tree_list (get_identifier ("externally_visible"),
4149 newattrs = tree_cons (get_identifier ("alloc_size"),
4150 build_tree_list (NULL_TREE, integer_one_node),
4152 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
4153 newtype = build_exception_variant (newtype, new_eh_spec);
4154 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
4155 deltype = build_exception_variant (deltype, empty_except_spec);
4156 tree opnew = push_cp_library_fn (NEW_EXPR, newtype, 0);
4157 DECL_IS_MALLOC (opnew) = 1;
4158 DECL_IS_OPERATOR_NEW (opnew) = 1;
4159 opnew = push_cp_library_fn (VEC_NEW_EXPR, newtype, 0);
4160 DECL_IS_MALLOC (opnew) = 1;
4161 DECL_IS_OPERATOR_NEW (opnew) = 1;
4162 push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
4163 push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
4164 if (flag_sized_deallocation)
4166 /* Also push the sized deallocation variants:
4167 void operator delete(void*, std::size_t) throw();
4168 void operator delete[](void*, std::size_t) throw(); */
4169 tree void_ftype_ptr_size
4170 = build_function_type_list (void_type_node, ptr_type_node,
4171 size_type_node, NULL_TREE);
4172 deltype = cp_build_type_attribute_variant (void_ftype_ptr_size,
4174 deltype = build_exception_variant (deltype, empty_except_spec);
4175 push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
4176 push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
4179 nullptr_type_node = make_node (NULLPTR_TYPE);
4180 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
4181 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
4182 TYPE_UNSIGNED (nullptr_type_node) = 1;
4183 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
4184 if (abi_version_at_least (9))
4185 TYPE_ALIGN (nullptr_type_node) = GET_MODE_ALIGNMENT (ptr_mode);
4186 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
4187 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
4188 nullptr_node = build_int_cst (nullptr_type_node, 0);
4192 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype,
4193 ECF_NORETURN | ECF_NOTHROW);
4195 /* Perform other language dependent initializations. */
4196 init_class_processing ();
4197 init_rtti_processing ();
4198 init_template_processing ();
4200 if (flag_exceptions)
4201 init_exception_processing ();
4203 if (! supports_one_only ())
4206 make_fname_decl = cp_make_fname_decl;
4207 start_fname_decls ();
4209 /* Show we use EH for cleanups. */
4210 if (flag_exceptions)
4211 using_eh_for_cleanups ();
4214 /* Generate an initializer for a function naming variable from
4215 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4216 filled in with the type of the init. */
4219 cp_fname_init (const char* name, tree *type_p)
4221 tree domain = NULL_TREE;
4223 tree init = NULL_TREE;
4228 length = strlen (name);
4229 domain = build_index_type (size_int (length));
4230 init = build_string (length + 1, name);
4233 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
4234 type = build_cplus_array_type (type, domain);
4239 TREE_TYPE (init) = type;
4241 init = error_mark_node;
4246 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4247 the decl, LOC is the location to give the decl, NAME is the
4248 initialization string and TYPE_DEP indicates whether NAME depended
4249 on the type of the function. We make use of that to detect
4250 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4251 at the point of first use, so we mustn't push the decl now. */
4254 cp_make_fname_decl (location_t loc, tree id, int type_dep)
4256 const char *const name = (type_dep && processing_template_decl
4257 ? NULL : fname_as_string (type_dep));
4259 tree init = cp_fname_init (name, &type);
4260 tree decl = build_decl (loc, VAR_DECL, id, type);
4263 free (CONST_CAST (char *, name));
4265 /* As we're using pushdecl_with_scope, we must set the context. */
4266 DECL_CONTEXT (decl) = current_function_decl;
4268 TREE_STATIC (decl) = 1;
4269 TREE_READONLY (decl) = 1;
4270 DECL_ARTIFICIAL (decl) = 1;
4272 TREE_USED (decl) = 1;
4274 if (current_function_decl)
4276 cp_binding_level *b = current_binding_level;
4277 if (b->kind == sk_function_parms)
4278 return error_mark_node;
4279 while (b->level_chain->kind != sk_function_parms)
4281 pushdecl_with_scope (decl, b, /*is_friend=*/false);
4282 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
4283 LOOKUP_ONLYCONVERTING);
4287 DECL_THIS_STATIC (decl) = true;
4288 pushdecl_top_level_and_finish (decl, init);
4295 builtin_function_1 (tree decl, tree context, bool is_global)
4297 tree id = DECL_NAME (decl);
4298 const char *name = IDENTIFIER_POINTER (id);
4300 retrofit_lang_decl (decl);
4302 DECL_ARTIFICIAL (decl) = 1;
4303 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
4304 SET_DECL_LANGUAGE (decl, lang_c);
4305 /* Runtime library routines are, by definition, available in an
4306 external shared object. */
4307 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
4308 DECL_VISIBILITY_SPECIFIED (decl) = 1;
4310 DECL_CONTEXT (decl) = context;
4313 pushdecl_top_level (decl);
4317 /* A function in the user's namespace should have an explicit
4318 declaration before it is used. Mark the built-in function as
4319 anticipated but not actually declared. */
4320 if (name[0] != '_' || name[1] != '_')
4321 DECL_ANTICIPATED (decl) = 1;
4322 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
4324 size_t len = strlen (name);
4326 /* Treat __*_chk fortification functions as anticipated as well,
4327 unless they are __builtin_*. */
4328 if (len > strlen ("___chk")
4329 && memcmp (name + len - strlen ("_chk"),
4330 "_chk", strlen ("_chk") + 1) == 0)
4331 DECL_ANTICIPATED (decl) = 1;
4338 cxx_builtin_function (tree decl)
4340 tree id = DECL_NAME (decl);
4341 const char *name = IDENTIFIER_POINTER (id);
4342 /* All builtins that don't begin with an '_' should additionally
4343 go in the 'std' namespace. */
4346 tree decl2 = copy_node(decl);
4347 push_namespace (std_identifier);
4348 builtin_function_1 (decl2, std_node, false);
4352 return builtin_function_1 (decl, NULL_TREE, false);
4355 /* Like cxx_builtin_function, but guarantee the function is added to the global
4356 scope. This is to allow function specific options to add new machine
4357 dependent builtins when the target ISA changes via attribute((target(...)))
4358 which saves space on program startup if the program does not use non-generic
4362 cxx_builtin_function_ext_scope (tree decl)
4365 tree id = DECL_NAME (decl);
4366 const char *name = IDENTIFIER_POINTER (id);
4367 /* All builtins that don't begin with an '_' should additionally
4368 go in the 'std' namespace. */
4371 tree decl2 = copy_node(decl);
4372 push_namespace (std_identifier);
4373 builtin_function_1 (decl2, std_node, true);
4377 return builtin_function_1 (decl, NULL_TREE, true);
4380 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4381 function. Not called directly. */
4384 build_library_fn (tree name, enum tree_code operator_code, tree type,
4387 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
4388 DECL_EXTERNAL (fn) = 1;
4389 TREE_PUBLIC (fn) = 1;
4390 DECL_ARTIFICIAL (fn) = 1;
4391 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
4392 SET_DECL_LANGUAGE (fn, lang_c);
4393 /* Runtime library routines are, by definition, available in an
4394 external shared object. */
4395 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
4396 DECL_VISIBILITY_SPECIFIED (fn) = 1;
4397 set_call_expr_flags (fn, ecf_flags);
4401 /* Returns the _DECL for a library function with C++ linkage. */
4404 build_cp_library_fn (tree name, enum tree_code operator_code, tree type,
4407 tree fn = build_library_fn (name, operator_code, type, ecf_flags);
4408 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
4409 SET_DECL_LANGUAGE (fn, lang_cplusplus);
4413 /* Like build_library_fn, but takes a C string instead of an
4417 build_library_fn_ptr (const char* name, tree type, int ecf_flags)
4419 return build_library_fn (get_identifier (name), ERROR_MARK, type, ecf_flags);
4422 /* Like build_cp_library_fn, but takes a C string instead of an
4426 build_cp_library_fn_ptr (const char* name, tree type, int ecf_flags)
4428 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type,
4432 /* Like build_library_fn, but also pushes the function so that we will
4433 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
4434 may throw exceptions listed in RAISES. */
4437 push_library_fn (tree name, tree type, tree raises, int ecf_flags)
4442 type = build_exception_variant (type, raises);
4444 fn = build_library_fn (name, ERROR_MARK, type, ecf_flags);
4445 pushdecl_top_level (fn);
4449 /* Like build_cp_library_fn, but also pushes the function so that it
4450 will be found by normal lookup. */
4453 push_cp_library_fn (enum tree_code operator_code, tree type,
4456 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4461 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4465 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4469 push_void_library_fn (tree name, tree parmtypes, int ecf_flags)
4471 tree type = build_function_type (void_type_node, parmtypes);
4472 return push_library_fn (name, type, NULL_TREE, ecf_flags);
4475 /* Like push_library_fn, but also note that this function throws
4476 and does not return. Used for __throw_foo and the like. */
4479 push_throw_library_fn (tree name, tree type)
4481 tree fn = push_library_fn (name, type, NULL_TREE, ECF_NORETURN);
4485 /* When we call finish_struct for an anonymous union, we create
4486 default copy constructors and such. But, an anonymous union
4487 shouldn't have such things; this function undoes the damage to the
4488 anonymous union type T.
4490 (The reason that we create the synthesized methods is that we don't
4491 distinguish `union { int i; }' from `typedef union { int i; } U'.
4492 The first is an anonymous union; the second is just an ordinary
4496 fixup_anonymous_aggr (tree t)
4500 /* Wipe out memory of synthesized methods. */
4501 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4502 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4503 TYPE_HAS_COPY_CTOR (t) = 0;
4504 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4505 TYPE_HAS_COPY_ASSIGN (t) = 0;
4506 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4508 /* Splice the implicitly generated functions out of the TYPE_METHODS
4510 q = &TYPE_METHODS (t);
4513 if (DECL_ARTIFICIAL (*q))
4514 *q = TREE_CHAIN (*q);
4516 q = &DECL_CHAIN (*q);
4519 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4520 if (TYPE_METHODS (t))
4522 tree decl = TYPE_MAIN_DECL (t);
4524 if (TREE_CODE (t) != UNION_TYPE)
4525 error_at (DECL_SOURCE_LOCATION (decl),
4526 "an anonymous struct cannot have function members");
4528 error_at (DECL_SOURCE_LOCATION (decl),
4529 "an anonymous union cannot have function members");
4532 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4533 assignment operators (because they cannot have these methods themselves).
4534 For anonymous unions this is already checked because they are not allowed
4535 in any union, otherwise we have to check it. */
4536 if (TREE_CODE (t) != UNION_TYPE)
4540 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4541 if (TREE_CODE (field) == FIELD_DECL)
4543 type = TREE_TYPE (field);
4544 if (CLASS_TYPE_P (type))
4546 if (TYPE_NEEDS_CONSTRUCTING (type))
4547 error ("member %q+#D with constructor not allowed "
4548 "in anonymous aggregate", field);
4549 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4550 error ("member %q+#D with destructor not allowed "
4551 "in anonymous aggregate", field);
4552 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4553 error ("member %q+#D with copy assignment operator "
4554 "not allowed in anonymous aggregate", field);
4560 /* Warn for an attribute located at LOCATION that appertains to the
4561 class type CLASS_TYPE that has not been properly placed after its
4562 class-key, in it class-specifier. */
4565 warn_misplaced_attr_for_class_type (source_location location,
4568 gcc_assert (OVERLOAD_TYPE_P (class_type));
4570 if (warning_at (location, OPT_Wattributes,
4571 "attribute ignored in declaration "
4572 "of %q#T", class_type))
4574 "attribute for %q#T must follow the %qs keyword",
4575 class_type, class_key_or_enum_as_string (class_type));
4578 /* Make sure that a declaration with no declarator is well-formed, i.e.
4579 just declares a tagged type or anonymous union.
4581 Returns the type declared; or NULL_TREE if none. */
4584 check_tag_decl (cp_decl_specifier_seq *declspecs,
4585 bool explicit_type_instantiation_p)
4587 int saw_friend = decl_spec_seq_has_spec_p (declspecs, ds_friend);
4588 int saw_typedef = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
4589 /* If a class, struct, or enum type is declared by the DECLSPECS
4590 (i.e, if a class-specifier, enum-specifier, or non-typename
4591 elaborated-type-specifier appears in the DECLSPECS),
4592 DECLARED_TYPE is set to the corresponding type. */
4593 tree declared_type = NULL_TREE;
4594 bool error_p = false;
4596 if (declspecs->multiple_types_p)
4597 error ("multiple types in one declaration");
4598 else if (declspecs->redefined_builtin_type)
4600 if (!in_system_header_at (input_location))
4601 permerror (declspecs->locations[ds_redefined_builtin_type_spec],
4602 "redeclaration of C++ built-in type %qT",
4603 declspecs->redefined_builtin_type);
4608 && TYPE_P (declspecs->type)
4609 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4610 && MAYBE_CLASS_TYPE_P (declspecs->type))
4611 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4612 declared_type = declspecs->type;
4613 else if (declspecs->type == error_mark_node)
4615 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4616 permerror (input_location, "declaration does not declare anything");
4617 else if (declared_type != NULL_TREE && type_uses_auto (declared_type))
4619 error_at (declspecs->locations[ds_type_spec],
4620 "%<auto%> can only be specified for variables "
4621 "or function declarations");
4622 return error_mark_node;
4624 /* Check for an anonymous union. */
4625 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4626 && TYPE_ANONYMOUS_P (declared_type))
4628 /* 7/3 In a simple-declaration, the optional init-declarator-list
4629 can be omitted only when declaring a class (clause 9) or
4630 enumeration (7.2), that is, when the decl-specifier-seq contains
4631 either a class-specifier, an elaborated-type-specifier with
4632 a class-key (9.1), or an enum-specifier. In these cases and
4633 whenever a class-specifier or enum-specifier is present in the
4634 decl-specifier-seq, the identifiers in these specifiers are among
4635 the names being declared by the declaration (as class-name,
4636 enum-names, or enumerators, depending on the syntax). In such
4637 cases, and except for the declaration of an unnamed bit-field (9.6),
4638 the decl-specifier-seq shall introduce one or more names into the
4639 program, or shall redeclare a name introduced by a previous
4640 declaration. [Example:
4641 enum { }; // ill-formed
4642 typedef class { }; // ill-formed
4646 error ("missing type-name in typedef-declaration");
4649 /* Anonymous unions are objects, so they can have specifiers. */;
4650 SET_ANON_AGGR_TYPE_P (declared_type);
4652 if (TREE_CODE (declared_type) != UNION_TYPE
4653 && !in_system_header_at (input_location))
4654 pedwarn (input_location, OPT_Wpedantic, "ISO C++ prohibits anonymous structs");
4659 if (decl_spec_seq_has_spec_p (declspecs, ds_inline))
4660 error_at (declspecs->locations[ds_inline],
4661 "%<inline%> can only be specified for functions");
4662 else if (decl_spec_seq_has_spec_p (declspecs, ds_virtual))
4663 error_at (declspecs->locations[ds_virtual],
4664 "%<virtual%> can only be specified for functions");
4666 && (!current_class_type
4667 || current_scope () != current_class_type))
4668 error_at (declspecs->locations[ds_friend],
4669 "%<friend%> can only be specified inside a class");
4670 else if (decl_spec_seq_has_spec_p (declspecs, ds_explicit))
4671 error_at (declspecs->locations[ds_explicit],
4672 "%<explicit%> can only be specified for constructors");
4673 else if (declspecs->storage_class)
4674 error_at (declspecs->locations[ds_storage_class],
4675 "a storage class can only be specified for objects "
4677 else if (decl_spec_seq_has_spec_p (declspecs, ds_const))
4678 error_at (declspecs->locations[ds_const],
4679 "%<const%> can only be specified for objects and "
4681 else if (decl_spec_seq_has_spec_p (declspecs, ds_volatile))
4682 error_at (declspecs->locations[ds_volatile],
4683 "%<volatile%> can only be specified for objects and "
4685 else if (decl_spec_seq_has_spec_p (declspecs, ds_restrict))
4686 error_at (declspecs->locations[ds_restrict],
4687 "%<__restrict%> can only be specified for objects and "
4689 else if (decl_spec_seq_has_spec_p (declspecs, ds_thread))
4690 error_at (declspecs->locations[ds_thread],
4691 "%<__thread%> can only be specified for objects "
4693 else if (saw_typedef)
4694 warning_at (declspecs->locations[ds_typedef], 0,
4695 "%<typedef%> was ignored in this declaration");
4696 else if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr))
4697 error_at (declspecs->locations[ds_constexpr],
4698 "%<constexpr%> cannot be used for type declarations");
4701 if (declspecs->attributes && warn_attributes && declared_type)
4704 if (!CLASS_TYPE_P (declared_type)
4705 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type))
4706 /* For a non-template class, use the name location. */
4707 loc = location_of (declared_type);
4709 /* For a template class (an explicit instantiation), use the
4710 current location. */
4711 loc = input_location;
4713 if (explicit_type_instantiation_p)
4714 /* [dcl.attr.grammar]/4:
4716 No attribute-specifier-seq shall appertain to an explicit
4719 if (warning_at (loc, OPT_Wattributes,
4720 "attribute ignored in explicit instantiation %q#T",
4723 "no attribute can be applied to "
4724 "an explicit instantiation");
4727 warn_misplaced_attr_for_class_type (loc, declared_type);
4730 return declared_type;
4733 /* Called when a declaration is seen that contains no names to declare.
4734 If its type is a reference to a structure, union or enum inherited
4735 from a containing scope, shadow that tag name for the current scope
4736 with a forward reference.
4737 If its type defines a new named structure or union
4738 or defines an enum, it is valid but we need not do anything here.
4739 Otherwise, it is an error.
4741 C++: may have to grok the declspecs to learn about static,
4742 complain for anonymous unions.
4744 Returns the TYPE declared -- or NULL_TREE if none. */
4747 shadow_tag (cp_decl_specifier_seq *declspecs)
4749 tree t = check_tag_decl (declspecs,
4750 /*explicit_type_instantiation_p=*/false);
4755 if (maybe_process_partial_specialization (t) == error_mark_node)
4758 /* This is where the variables in an anonymous union are
4759 declared. An anonymous union declaration looks like:
4761 because there is no declarator after the union, the parser
4762 sends that declaration here. */
4763 if (ANON_AGGR_TYPE_P (t))
4765 fixup_anonymous_aggr (t);
4767 if (TYPE_FIELDS (t))
4769 tree decl = grokdeclarator (/*declarator=*/NULL,
4770 declspecs, NORMAL, 0, NULL);
4771 finish_anon_union (decl);
4778 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4781 groktypename (cp_decl_specifier_seq *type_specifiers,
4782 const cp_declarator *declarator,
4783 bool is_template_arg)
4787 enum decl_context context
4788 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4789 attrs = type_specifiers->attributes;
4790 type_specifiers->attributes = NULL_TREE;
4791 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4792 if (attrs && type != error_mark_node)
4794 if (CLASS_TYPE_P (type))
4795 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4796 "outside of definition", type);
4797 else if (MAYBE_CLASS_TYPE_P (type))
4798 /* A template type parameter or other dependent type. */
4799 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4800 "type %qT without an associated declaration", type);
4802 cplus_decl_attributes (&type, attrs, 0);
4807 /* Process a DECLARATOR for a function-scope variable declaration,
4808 namespace-scope variable declaration, or function declaration.
4809 (Function definitions go through start_function; class member
4810 declarations appearing in the body of the class go through
4811 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4812 If an error occurs, the error_mark_node is returned instead.
4814 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4815 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4816 for an explicitly defaulted function, or SD_DELETED for an explicitly
4817 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4818 implicitly initialized via a default constructor. ATTRIBUTES and
4819 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4821 The scope represented by the context of the returned DECL is pushed
4822 (if it is not the global namespace) and is assigned to
4823 *PUSHED_SCOPE_P. The caller is then responsible for calling
4824 pop_scope on *PUSHED_SCOPE_P if it is set. */
4827 start_decl (const cp_declarator *declarator,
4828 cp_decl_specifier_seq *declspecs,
4831 tree prefix_attributes,
4832 tree *pushed_scope_p)
4840 *pushed_scope_p = NULL_TREE;
4842 /* An object declared as __attribute__((deprecated)) suppresses
4843 warnings of uses of other deprecated items. */
4844 if (lookup_attribute ("deprecated", attributes))
4845 deprecated_state = DEPRECATED_SUPPRESS;
4847 attributes = chainon (attributes, prefix_attributes);
4849 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4852 deprecated_state = DEPRECATED_NORMAL;
4854 if (decl == NULL_TREE || VOID_TYPE_P (decl)
4855 || decl == error_mark_node)
4856 return error_mark_node;
4858 context = CP_DECL_CONTEXT (decl);
4859 if (context != global_namespace)
4860 *pushed_scope_p = push_scope (context);
4862 /* Is it valid for this decl to have an initializer at all?
4863 If not, set INITIALIZED to zero, which will indirectly
4864 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4866 && TREE_CODE (decl) == TYPE_DECL)
4868 error ("typedef %qD is initialized (use decltype instead)", decl);
4869 return error_mark_node;
4874 if (! toplevel_bindings_p ()
4875 && DECL_EXTERNAL (decl))
4876 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4878 DECL_EXTERNAL (decl) = 0;
4879 if (toplevel_bindings_p ())
4880 TREE_STATIC (decl) = 1;
4882 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4884 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4885 record_key_method_defined (decl);
4887 /* If this is a typedef that names the class for linkage purposes
4888 (7.1.3p8), apply any attributes directly to the type. */
4889 if (TREE_CODE (decl) == TYPE_DECL
4890 && OVERLOAD_TYPE_P (TREE_TYPE (decl))
4891 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4892 flags = ATTR_FLAG_TYPE_IN_PLACE;
4896 /* Set attributes here so if duplicate decl, will have proper attributes. */
4897 cplus_decl_attributes (&decl, attributes, flags);
4899 /* Dllimported symbols cannot be defined. Static data members (which
4900 can be initialized in-class and dllimported) go through grokfield,
4901 not here, so we don't need to exclude those decls when checking for
4903 if (initialized && DECL_DLLIMPORT_P (decl))
4905 error ("definition of %q#D is marked %<dllimport%>", decl);
4906 DECL_DLLIMPORT_P (decl) = 0;
4909 /* If #pragma weak was used, mark the decl weak now. */
4910 if (!processing_template_decl)
4911 maybe_apply_pragma_weak (decl);
4913 if (TREE_CODE (decl) == FUNCTION_DECL
4914 && DECL_DECLARED_INLINE_P (decl)
4915 && DECL_UNINLINABLE (decl)
4916 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4917 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4918 "inline function %qD given attribute noinline", decl);
4920 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4922 bool this_tmpl = (processing_template_decl
4923 > template_class_depth (context));
4926 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4927 if (field == NULL_TREE
4928 || !(VAR_P (field) || variable_template_p (field)))
4929 error ("%q+#D is not a static data member of %q#T", decl, context);
4930 else if (variable_template_p (field) && !this_tmpl)
4932 if (DECL_LANG_SPECIFIC (decl)
4933 && DECL_TEMPLATE_SPECIALIZATION (decl))
4934 /* OK, specialization was already checked. */;
4937 error_at (DECL_SOURCE_LOCATION (decl),
4938 "non-member-template declaration of %qD", decl);
4939 inform (DECL_SOURCE_LOCATION (field), "does not match "
4940 "member template declaration here");
4941 return error_mark_node;
4946 if (variable_template_p (field))
4947 field = DECL_TEMPLATE_RESULT (field);
4949 if (DECL_CONTEXT (field) != context)
4951 if (!same_type_p (DECL_CONTEXT (field), context))
4952 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4953 "to be defined as %<%T::%D%>",
4954 DECL_CONTEXT (field), DECL_NAME (decl),
4955 context, DECL_NAME (decl));
4956 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4958 /* Static data member are tricky; an in-class initialization
4959 still doesn't provide a definition, so the in-class
4960 declaration will have DECL_EXTERNAL set, but will have an
4961 initialization. Thus, duplicate_decls won't warn
4962 about this situation, and so we check here. */
4963 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4964 error ("duplicate initialization of %qD", decl);
4965 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4967 if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr)
4968 && !DECL_DECLARED_CONSTEXPR_P (field))
4969 error ("%qD declared %<constexpr%> outside its class", field);
4974 tree field = check_classfn (context, decl,
4976 ? current_template_parms
4978 if (field && field != error_mark_node
4979 && duplicate_decls (decl, field,
4980 /*newdecl_is_friend=*/false))
4984 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4985 DECL_IN_AGGR_P (decl) = 0;
4986 /* Do not mark DECL as an explicit specialization if it was not
4987 already marked as an instantiation; a declaration should
4988 never be marked as a specialization unless we know what
4989 template is being specialized. */
4990 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4992 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4993 if (TREE_CODE (decl) == FUNCTION_DECL)
4994 DECL_COMDAT (decl) = (TREE_PUBLIC (decl)
4995 && DECL_DECLARED_INLINE_P (decl));
4997 DECL_COMDAT (decl) = false;
4999 /* [temp.expl.spec] An explicit specialization of a static data
5000 member of a template is a definition if the declaration
5001 includes an initializer; otherwise, it is a declaration.
5003 We check for processing_specialization so this only applies
5004 to the new specialization syntax. */
5005 if (!initialized && processing_specialization)
5006 DECL_EXTERNAL (decl) = 1;
5009 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
5010 /* Aliases are definitions. */
5012 permerror (input_location, "declaration of %q#D outside of class is not definition",
5016 was_public = TREE_PUBLIC (decl);
5018 /* Enter this declaration into the symbol table. Don't push the plain
5019 VAR_DECL for a variable template. */
5020 if (!template_parm_scope_p ()
5022 decl = maybe_push_decl (decl);
5024 if (processing_template_decl)
5025 decl = push_template_decl (decl);
5026 if (decl == error_mark_node)
5027 return error_mark_node;
5030 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
5031 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
5033 /* This is a const variable with implicit 'static'. Set
5034 DECL_THIS_STATIC so we can tell it from variables that are
5035 !TREE_PUBLIC because of the anonymous namespace. */
5036 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
5037 DECL_THIS_STATIC (decl) = 1;
5040 if (current_function_decl && VAR_P (decl)
5041 && DECL_DECLARED_CONSTEXPR_P (current_function_decl))
5044 if (CP_DECL_THREAD_LOCAL_P (decl))
5045 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5047 else if (TREE_STATIC (decl))
5048 error ("%qD declared %<static%> in %<constexpr%> function", decl);
5052 cp_function_chain->invalid_constexpr = true;
5055 if (!processing_template_decl && VAR_P (decl))
5056 start_decl_1 (decl, initialized);
5061 /* Process the declaration of a variable DECL. INITIALIZED is true
5062 iff DECL is explicitly initialized. (INITIALIZED is false if the
5063 variable is initialized via an implicitly-called constructor.)
5064 This function must be called for ordinary variables (including, for
5065 example, implicit instantiations of templates), but must not be
5066 called for template declarations. */
5069 start_decl_1 (tree decl, bool initialized)
5073 bool aggregate_definition_p;
5075 gcc_assert (!processing_template_decl);
5077 if (error_operand_p (decl))
5080 gcc_assert (VAR_P (decl));
5082 type = TREE_TYPE (decl);
5083 complete_p = COMPLETE_TYPE_P (type);
5084 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
5086 /* If an explicit initializer is present, or if this is a definition
5087 of an aggregate, then we need a complete type at this point.
5088 (Scalars are always complete types, so there is nothing to
5089 check.) This code just sets COMPLETE_P; errors (if necessary)
5090 are issued below. */
5091 if ((initialized || aggregate_definition_p)
5093 && COMPLETE_TYPE_P (complete_type (type)))
5096 /* We will not yet have set TREE_READONLY on DECL if the type
5097 was "const", but incomplete, before this point. But, now, we
5098 have a complete type, so we can try again. */
5099 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
5103 /* Is it valid for this decl to have an initializer at all? */
5105 /* Don't allow initializations for incomplete types except for
5106 arrays which might be completed by the initialization. */
5108 ; /* A complete type is ok. */
5109 else if (type_uses_auto (type))
5110 ; /* An auto type is ok. */
5111 else if (TREE_CODE (type) != ARRAY_TYPE)
5113 error ("variable %q#D has initializer but incomplete type", decl);
5114 type = TREE_TYPE (decl) = error_mark_node;
5116 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
5118 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
5119 error ("elements of array %q#D have incomplete type", decl);
5120 /* else we already gave an error in start_decl. */
5123 else if (aggregate_definition_p && !complete_p)
5125 if (type_uses_auto (type))
5126 error ("declaration of %q#D has no initializer", decl);
5128 error ("aggregate %q#D has incomplete type and cannot be defined",
5130 /* Change the type so that assemble_variable will give
5131 DECL an rtl we can live with: (mem (const_int 0)). */
5132 type = TREE_TYPE (decl) = error_mark_node;
5135 /* Create a new scope to hold this declaration if necessary.
5136 Whether or not a new scope is necessary cannot be determined
5137 until after the type has been completed; if the type is a
5138 specialization of a class template it is not until after
5139 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5140 will be set correctly. */
5141 maybe_push_cleanup_level (type);
5144 /* Handle initialization of references. DECL, TYPE, and INIT have the
5145 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5146 but will be set to a new CLEANUP_STMT if a temporary is created
5147 that must be destroyed subsequently.
5149 Returns an initializer expression to use to initialize DECL, or
5150 NULL if the initialization can be performed statically.
5152 Quotes on semantics can be found in ARM 8.4.3. */
5155 grok_reference_init (tree decl, tree type, tree init, int flags)
5157 if (init == NULL_TREE)
5159 if ((DECL_LANG_SPECIFIC (decl) == 0
5160 || DECL_IN_AGGR_P (decl) == 0)
5161 && ! DECL_THIS_EXTERN (decl))
5162 error ("%qD declared as reference but not initialized", decl);
5166 if (TREE_CODE (init) == TREE_LIST)
5167 init = build_x_compound_expr_from_list (init, ELK_INIT,
5168 tf_warning_or_error);
5170 tree ttype = TREE_TYPE (type);
5171 if (TREE_CODE (ttype) != ARRAY_TYPE
5172 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
5173 /* Note: default conversion is only called in very special cases. */
5174 init = decay_conversion (init, tf_warning_or_error);
5176 /* check_initializer handles this for non-reference variables, but for
5177 references we need to do it here or the initializer will get the
5178 incomplete array type and confuse later calls to
5179 cp_complete_array_type. */
5180 if (TREE_CODE (ttype) == ARRAY_TYPE
5181 && TYPE_DOMAIN (ttype) == NULL_TREE
5182 && (BRACE_ENCLOSED_INITIALIZER_P (init)
5183 || TREE_CODE (init) == STRING_CST))
5185 cp_complete_array_type (&ttype, init, false);
5186 if (ttype != TREE_TYPE (type))
5187 type = cp_build_reference_type (ttype, TYPE_REF_IS_RVALUE (type));
5190 /* Convert INIT to the reference type TYPE. This may involve the
5191 creation of a temporary, whose lifetime must be the same as that
5192 of the reference. If so, a DECL_EXPR for the temporary will be
5193 added just after the DECL_EXPR for DECL. That's why we don't set
5194 DECL_INITIAL for local references (instead assigning to them
5195 explicitly); we need to allow the temporary to be initialized
5197 return initialize_reference (type, init, flags,
5198 tf_warning_or_error);
5201 /* Designated initializers in arrays are not supported in GNU C++.
5202 The parser cannot detect this error since it does not know whether
5203 a given brace-enclosed initializer is for a class type or for an
5204 array. This function checks that CE does not use a designated
5205 initializer. If it does, an error is issued. Returns true if CE
5206 is valid, i.e., does not have a designated initializer. */
5209 check_array_designated_initializer (constructor_elt *ce,
5210 unsigned HOST_WIDE_INT index)
5212 /* Designated initializers for array elements are not supported. */
5215 /* The parser only allows identifiers as designated
5217 if (ce->index == error_mark_node)
5219 error ("name used in a GNU-style designated "
5220 "initializer for an array");
5223 else if (identifier_p (ce->index))
5225 error ("name %qD used in a GNU-style designated "
5226 "initializer for an array", ce->index);
5230 tree ce_index = build_expr_type_conversion (WANT_INT | WANT_ENUM,
5233 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index))
5234 && (TREE_CODE (ce_index = maybe_constant_value (ce_index))
5237 /* A C99 designator is OK if it matches the current index. */
5238 if (wi::eq_p (ce_index, index))
5241 sorry ("non-trivial designated initializers not supported");
5244 error ("C99 designator %qE is not an integral constant-expression",
5253 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5254 array until we finish parsing the initializer. If that's the
5255 situation we're in, update DECL accordingly. */
5258 maybe_deduce_size_from_array_init (tree decl, tree init)
5260 tree type = TREE_TYPE (decl);
5262 if (TREE_CODE (type) == ARRAY_TYPE
5263 && TYPE_DOMAIN (type) == NULL_TREE
5264 && TREE_CODE (decl) != TYPE_DECL)
5266 /* do_default is really a C-ism to deal with tentative definitions.
5267 But let's leave it here to ease the eventual merge. */
5268 int do_default = !DECL_EXTERNAL (decl);
5269 tree initializer = init ? init : DECL_INITIAL (decl);
5272 /* Check that there are no designated initializers in INIT, as
5273 those are not supported in GNU C++, and as the middle-end
5274 will crash if presented with a non-numeric designated
5276 if (initializer && BRACE_ENCLOSED_INITIALIZER_P (initializer))
5278 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initializer);
5279 constructor_elt *ce;
5281 FOR_EACH_VEC_SAFE_ELT (v, i, ce)
5282 if (!check_array_designated_initializer (ce, i))
5288 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
5292 error ("initializer fails to determine size of %qD", decl);
5294 else if (failure == 2)
5298 error ("array size missing in %qD", decl);
5300 /* If a `static' var's size isn't known, make it extern as
5301 well as static, so it does not get allocated. If it's not
5302 `static', then don't mark it extern; finish_incomplete_decl
5303 will give it a default size and it will get allocated. */
5304 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
5305 DECL_EXTERNAL (decl) = 1;
5307 else if (failure == 3)
5309 error ("zero-size array %qD", decl);
5313 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
5315 relayout_decl (decl);
5319 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5320 any appropriate error messages regarding the layout. */
5323 layout_var_decl (tree decl)
5327 type = TREE_TYPE (decl);
5328 if (type == error_mark_node)
5331 /* If we haven't already laid out this declaration, do so now.
5332 Note that we must not call complete type for an external object
5333 because it's type might involve templates that we are not
5334 supposed to instantiate yet. (And it's perfectly valid to say
5335 `extern X x' for some incomplete type `X'.) */
5336 if (!DECL_EXTERNAL (decl))
5337 complete_type (type);
5338 if (!DECL_SIZE (decl)
5339 && TREE_TYPE (decl) != error_mark_node
5340 && complete_or_array_type_p (type))
5341 layout_decl (decl, 0);
5343 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
5345 /* An automatic variable with an incomplete type: that is an error.
5346 Don't talk about array types here, since we took care of that
5347 message in grokdeclarator. */
5348 error ("storage size of %qD isn%'t known", decl);
5349 TREE_TYPE (decl) = error_mark_node;
5352 /* Keep this code around in case we later want to control debug info
5353 based on whether a type is "used". (jason 1999-11-11) */
5355 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
5356 /* Let debugger know it should output info for this type. */
5357 note_debug_info_needed (ttype);
5359 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
5360 note_debug_info_needed (DECL_CONTEXT (decl));
5363 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
5364 && DECL_SIZE (decl) != NULL_TREE
5365 && ! TREE_CONSTANT (DECL_SIZE (decl)))
5367 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
5368 constant_expression_warning (DECL_SIZE (decl));
5371 error ("storage size of %qD isn%'t constant", decl);
5372 TREE_TYPE (decl) = error_mark_node;
5377 /* If a local static variable is declared in an inline function, or if
5378 we have a weak definition, we must endeavor to create only one
5379 instance of the variable at link-time. */
5382 maybe_commonize_var (tree decl)
5384 /* Static data in a function with comdat linkage also has comdat
5386 if (TREE_STATIC (decl)
5387 /* Don't mess with __FUNCTION__. */
5388 && ! DECL_ARTIFICIAL (decl)
5389 && DECL_FUNCTION_SCOPE_P (decl)
5390 && vague_linkage_p (DECL_CONTEXT (decl)))
5394 /* With weak symbols, we simply make the variable COMDAT;
5395 that will cause copies in multiple translations units to
5397 comdat_linkage (decl);
5401 if (DECL_INITIAL (decl) == NULL_TREE
5402 || DECL_INITIAL (decl) == error_mark_node)
5404 /* Without weak symbols, we can use COMMON to merge
5405 uninitialized variables. */
5406 TREE_PUBLIC (decl) = 1;
5407 DECL_COMMON (decl) = 1;
5411 /* While for initialized variables, we must use internal
5412 linkage -- which means that multiple copies will not
5414 TREE_PUBLIC (decl) = 0;
5415 DECL_COMMON (decl) = 0;
5416 if (warning_at (DECL_SOURCE_LOCATION (decl), 0,
5417 "sorry: semantics of inline function static "
5418 "data %q#D are wrong (you%'ll wind up "
5419 "with multiple copies)", decl))
5420 inform (DECL_SOURCE_LOCATION (decl),
5421 "you can work around this by removing the initializer");
5427 /* Issue an error message if DECL is an uninitialized const variable. */
5430 check_for_uninitialized_const_var (tree decl)
5432 tree type = strip_array_types (TREE_TYPE (decl));
5434 /* ``Unless explicitly declared extern, a const object does not have
5435 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5438 && TREE_CODE (type) != REFERENCE_TYPE
5439 && (CP_TYPE_CONST_P (type) || var_in_constexpr_fn (decl))
5440 && !DECL_INITIAL (decl))
5442 tree field = default_init_uninitialized_part (type);
5446 if (CP_TYPE_CONST_P (type))
5447 permerror (DECL_SOURCE_LOCATION (decl),
5448 "uninitialized const %qD", decl);
5451 error_at (DECL_SOURCE_LOCATION (decl),
5452 "uninitialized variable %qD in %<constexpr%> function",
5454 cp_function_chain->invalid_constexpr = true;
5457 if (CLASS_TYPE_P (type))
5459 tree defaulted_ctor;
5461 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
5462 "%q#T has no user-provided default constructor", type);
5463 defaulted_ctor = in_class_defaulted_default_constructor (type);
5465 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
5466 "constructor is not user-provided because it is "
5467 "explicitly defaulted in the class body");
5468 inform (DECL_SOURCE_LOCATION (field),
5469 "and the implicitly-defined constructor does not "
5470 "initialize %q#D", field);
5475 /* Structure holding the current initializer being processed by reshape_init.
5476 CUR is a pointer to the current element being processed, END is a pointer
5477 after the last element present in the initializer. */
5480 constructor_elt *cur;
5481 constructor_elt *end;
5484 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
5486 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5487 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5488 initialized. If there are no more such fields, the return value
5492 next_initializable_field (tree field)
5495 && (TREE_CODE (field) != FIELD_DECL
5496 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
5497 || DECL_ARTIFICIAL (field)))
5498 field = DECL_CHAIN (field);
5503 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5504 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5505 INTEGER_CST representing the size of the array minus one (the maximum index),
5506 or NULL_TREE if the array was declared without specifying the size. D is
5507 the iterator within the constructor. */
5510 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
5511 tsubst_flags_t complain)
5514 bool sized_array_p = (max_index && TREE_CONSTANT (max_index));
5515 unsigned HOST_WIDE_INT max_index_cst = 0;
5516 unsigned HOST_WIDE_INT index;
5518 /* The initializer for an array is always a CONSTRUCTOR. */
5519 new_init = build_constructor (init_list_type_node, NULL);
5523 /* Minus 1 is used for zero sized arrays. */
5524 if (integer_all_onesp (max_index))
5527 if (tree_fits_uhwi_p (max_index))
5528 max_index_cst = tree_to_uhwi (max_index);
5529 /* sizetype is sign extended, not zero extended. */
5531 max_index_cst = tree_to_uhwi (fold_convert (size_type_node, max_index));
5534 /* Loop until there are no more initializers. */
5536 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5540 constructor_elt *old_cur = d->cur;
5542 check_array_designated_initializer (d->cur, index);
5543 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5545 if (elt_init == error_mark_node)
5546 return error_mark_node;
5547 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5548 size_int (index), elt_init);
5549 if (!TREE_CONSTANT (elt_init))
5550 TREE_CONSTANT (new_init) = false;
5552 /* This can happen with an invalid initializer (c++/54501). */
5553 if (d->cur == old_cur && !sized_array_p)
5560 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5561 Parameters are the same of reshape_init_r. */
5564 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5566 tree max_index = NULL_TREE;
5568 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5570 if (TYPE_DOMAIN (type))
5571 max_index = array_type_nelts (type);
5573 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5576 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5577 Parameters are the same of reshape_init_r. */
5580 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5582 tree max_index = NULL_TREE;
5584 gcc_assert (VECTOR_TYPE_P (type));
5586 if (COMPOUND_LITERAL_P (d->cur->value))
5588 tree value = d->cur->value;
5589 if (!same_type_p (TREE_TYPE (value), type))
5591 if (complain & tf_error)
5592 error ("invalid type %qT as initializer for a vector of type %qT",
5593 TREE_TYPE (d->cur->value), type);
5594 value = error_mark_node;
5600 /* For a vector, we initialize it as an array of the appropriate size. */
5601 if (VECTOR_TYPE_P (type))
5602 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5604 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5607 /* Subroutine of reshape_init_r, processes the initializers for classes
5608 or union. Parameters are the same of reshape_init_r. */
5611 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5612 tsubst_flags_t complain)
5617 gcc_assert (CLASS_TYPE_P (type));
5619 /* The initializer for a class is always a CONSTRUCTOR. */
5620 new_init = build_constructor (init_list_type_node, NULL);
5621 field = next_initializable_field (TYPE_FIELDS (type));
5627 An initializer for an aggregate member that is an
5628 empty class shall have the form of an empty
5629 initializer-list {}. */
5630 if (!first_initializer_p)
5632 if (complain & tf_error)
5633 error ("initializer for %qT must be brace-enclosed", type);
5634 return error_mark_node;
5639 /* Loop through the initializable fields, gathering initializers. */
5640 while (d->cur != d->end)
5643 constructor_elt *old_cur = d->cur;
5645 /* Handle designated initializers, as an extension. */
5648 if (d->cur->index == error_mark_node)
5649 return error_mark_node;
5651 if (TREE_CODE (d->cur->index) == FIELD_DECL)
5652 /* We already reshaped this. */
5653 gcc_assert (d->cur->index == field);
5654 else if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
5655 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5658 if (complain & tf_error)
5659 error ("%<[%E] =%> used in a GNU-style designated initializer"
5660 " for class %qT", d->cur->index, type);
5661 return error_mark_node;
5664 if (!field || TREE_CODE (field) != FIELD_DECL)
5666 if (complain & tf_error)
5667 error ("%qT has no non-static data member named %qD", type,
5669 return error_mark_node;
5673 /* If we processed all the member of the class, we are done. */
5677 field_init = reshape_init_r (TREE_TYPE (field), d,
5678 /*first_initializer_p=*/false, complain);
5679 if (field_init == error_mark_node)
5680 return error_mark_node;
5682 if (d->cur == old_cur && d->cur->index)
5684 /* This can happen with an invalid initializer for a flexible
5685 array member (c++/54441). */
5686 if (complain & tf_error)
5687 error ("invalid initializer for %q#D", field);
5688 return error_mark_node;
5691 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5695 When a union is initialized with a brace-enclosed
5696 initializer, the braces shall only contain an
5697 initializer for the first member of the union. */
5698 if (TREE_CODE (type) == UNION_TYPE)
5701 field = next_initializable_field (DECL_CHAIN (field));
5707 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5708 designators are not valid; either complain or return true to indicate
5709 that reshape_init_r should return error_mark_node. */
5712 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
5716 if (complain & tf_error)
5717 error ("C99 designator %qE outside aggregate initializer",
5725 /* Subroutine of reshape_init, which processes a single initializer (part of
5726 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5727 iterator within the CONSTRUCTOR which points to the initializer to process.
5728 FIRST_INITIALIZER_P is true if this is the first initializer of the
5729 outermost CONSTRUCTOR node. */
5732 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5733 tsubst_flags_t complain)
5735 tree init = d->cur->value;
5737 if (error_operand_p (init))
5738 return error_mark_node;
5740 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
5741 && has_designator_problem (d, complain))
5742 return error_mark_node;
5744 if (TREE_CODE (type) == COMPLEX_TYPE)
5746 /* A complex type can be initialized from one or two initializers,
5747 but braces are not elided. */
5749 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5751 if (CONSTRUCTOR_NELTS (init) > 2)
5753 if (complain & tf_error)
5754 error ("too many initializers for %qT", type);
5756 return error_mark_node;
5759 else if (first_initializer_p && d->cur != d->end)
5761 vec<constructor_elt, va_gc> *v = 0;
5762 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5763 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5764 if (has_designator_problem (d, complain))
5765 return error_mark_node;
5767 init = build_constructor (init_list_type_node, v);
5772 /* A non-aggregate type is always initialized with a single
5774 if (!CP_AGGREGATE_TYPE_P (type))
5776 /* It is invalid to initialize a non-aggregate type with a
5777 brace-enclosed initializer before C++0x.
5778 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5779 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5780 a CONSTRUCTOR (with a record type). */
5781 if (TREE_CODE (init) == CONSTRUCTOR
5782 /* Don't complain about a capture-init. */
5783 && !CONSTRUCTOR_IS_DIRECT_INIT (init)
5784 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5786 if (SCALAR_TYPE_P (type))
5788 if (cxx_dialect < cxx11
5789 /* Isn't value-initialization. */
5790 || CONSTRUCTOR_NELTS (init) > 0)
5792 if (complain & tf_error)
5793 error ("braces around scalar initializer for type %qT",
5795 init = error_mark_node;
5799 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5806 /* "If T is a class type and the initializer list has a single element of
5807 type cv U, where U is T or a class derived from T, the object is
5808 initialized from that element." Even if T is an aggregate. */
5809 if (cxx_dialect >= cxx11 && (CLASS_TYPE_P (type) || VECTOR_TYPE_P (type))
5810 && first_initializer_p
5811 && d->end - d->cur == 1
5812 && reference_related_p (type, TREE_TYPE (init)))
5820 All implicit type conversions (clause _conv_) are considered when
5821 initializing the aggregate member with an initializer from an
5822 initializer-list. If the initializer can initialize a member,
5823 the member is initialized. Otherwise, if the member is itself a
5824 non-empty subaggregate, brace elision is assumed and the
5825 initializer is considered for the initialization of the first
5826 member of the subaggregate. */
5827 if (TREE_CODE (init) != CONSTRUCTOR
5828 /* But don't try this for the first initializer, since that would be
5829 looking through the outermost braces; A a2 = { a1 }; is not a
5830 valid aggregate initialization. */
5831 && !first_initializer_p
5832 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5833 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL,
5840 /* [dcl.init.string]
5842 A char array (whether plain char, signed char, or unsigned char)
5843 can be initialized by a string-literal (optionally enclosed in
5844 braces); a wchar_t array can be initialized by a wide
5845 string-literal (optionally enclosed in braces). */
5846 if (TREE_CODE (type) == ARRAY_TYPE
5847 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5849 tree str_init = init;
5851 /* Strip one level of braces if and only if they enclose a single
5852 element (as allowed by [dcl.init.string]). */
5853 if (!first_initializer_p
5854 && TREE_CODE (str_init) == CONSTRUCTOR
5855 && vec_safe_length (CONSTRUCTOR_ELTS (str_init)) == 1)
5857 str_init = (*CONSTRUCTOR_ELTS (str_init))[0].value;
5860 /* If it's a string literal, then it's the initializer for the array
5861 as a whole. Otherwise, continue with normal initialization for
5862 array types (one value per array element). */
5863 if (TREE_CODE (str_init) == STRING_CST)
5865 if (has_designator_problem (d, complain))
5866 return error_mark_node;
5872 /* The following cases are about aggregates. If we are not within a full
5873 initializer already, and there is not a CONSTRUCTOR, it means that there
5874 is a missing set of braces (that is, we are processing the case for
5875 which reshape_init exists). */
5876 if (!first_initializer_p)
5878 if (TREE_CODE (init) == CONSTRUCTOR)
5880 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5881 /* There is no need to reshape pointer-to-member function
5882 initializers, as they are always constructed correctly
5883 by the front end. */
5885 else if (COMPOUND_LITERAL_P (init))
5886 /* For a nested compound literal, there is no need to reshape since
5887 brace elision is not allowed. Even if we decided to allow it,
5888 we should add a call to reshape_init in finish_compound_literal,
5889 before calling digest_init, so changing this code would still
5890 not be necessary. */
5891 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5895 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5896 return reshape_init (type, init, complain);
5900 if (complain & tf_warning)
5901 warning (OPT_Wmissing_braces,
5902 "missing braces around initializer for %qT",
5906 /* Dispatch to specialized routines. */
5907 if (CLASS_TYPE_P (type))
5908 return reshape_init_class (type, d, first_initializer_p, complain);
5909 else if (TREE_CODE (type) == ARRAY_TYPE)
5910 return reshape_init_array (type, d, complain);
5911 else if (VECTOR_TYPE_P (type))
5912 return reshape_init_vector (type, d, complain);
5917 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5918 brace-enclosed aggregate initializer.
5920 INIT is the CONSTRUCTOR containing the list of initializers describing
5921 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5922 It may not presently match the shape of the TYPE; for example:
5924 struct S { int a; int b; };
5925 struct S a[] = { 1, 2, 3, 4 };
5927 Here INIT will hold a vector of four elements, rather than a
5928 vector of two elements, each itself a vector of two elements. This
5929 routine transforms INIT from the former form into the latter. The
5930 revised CONSTRUCTOR node is returned. */
5933 reshape_init (tree type, tree init, tsubst_flags_t complain)
5935 vec<constructor_elt, va_gc> *v;
5939 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5941 v = CONSTRUCTOR_ELTS (init);
5943 /* An empty constructor does not need reshaping, and it is always a valid
5945 if (vec_safe_is_empty (v))
5948 /* Recurse on this CONSTRUCTOR. */
5950 d.end = d.cur + v->length ();
5952 new_init = reshape_init_r (type, &d, true, complain);
5953 if (new_init == error_mark_node)
5954 return error_mark_node;
5956 /* Make sure all the element of the constructor were used. Otherwise,
5957 issue an error about exceeding initializers. */
5960 if (complain & tf_error)
5961 error ("too many initializers for %qT", type);
5963 return error_mark_node;
5969 /* Verify array initializer. Returns true if errors have been reported. */
5972 check_array_initializer (tree decl, tree type, tree init)
5974 tree element_type = TREE_TYPE (type);
5976 /* The array type itself need not be complete, because the
5977 initializer may tell us how many elements are in the array.
5978 But, the elements of the array must be complete. */
5979 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5982 error ("elements of array %q#D have incomplete type", decl);
5984 error ("elements of array %q#T have incomplete type", type);
5987 /* A compound literal can't have variable size. */
5989 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5990 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5992 error ("variable-sized compound literal");
5998 /* Subroutine of check_initializer; args are passed down from that function.
5999 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6002 build_aggr_init_full_exprs (tree decl, tree init, int flags)
6005 gcc_assert (stmts_are_full_exprs_p ());
6006 return build_aggr_init (decl, init, flags, tf_warning_or_error);
6009 /* Verify INIT (the initializer for DECL), and record the
6010 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6011 grok_reference_init.
6013 If the return value is non-NULL, it is an expression that must be
6014 evaluated dynamically to initialize DECL. */
6017 check_initializer (tree decl, tree init, int flags, vec<tree, va_gc> **cleanups)
6019 tree type = TREE_TYPE (decl);
6020 tree init_code = NULL;
6023 /* Things that are going to be initialized need to have complete
6025 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
6027 if (DECL_HAS_VALUE_EXPR_P (decl))
6029 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6030 it doesn't have storage to be initialized. */
6031 gcc_assert (init == NULL_TREE);
6035 if (type == error_mark_node)
6036 /* We will have already complained. */
6039 if (TREE_CODE (type) == ARRAY_TYPE)
6041 if (check_array_initializer (decl, type, init))
6044 else if (!COMPLETE_TYPE_P (type))
6046 error ("%q#D has incomplete type", decl);
6047 TREE_TYPE (decl) = error_mark_node;
6051 /* There is no way to make a variable-sized class type in GNU C++. */
6052 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
6054 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
6056 int init_len = vec_safe_length (CONSTRUCTOR_ELTS (init));
6057 if (SCALAR_TYPE_P (type))
6061 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
6062 init = build_zero_init (type, NULL_TREE, false);
6064 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
6066 error ("scalar object %qD requires one element in initializer",
6068 TREE_TYPE (decl) = error_mark_node;
6074 if (TREE_CODE (decl) == CONST_DECL)
6076 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
6078 DECL_INITIAL (decl) = init;
6080 gcc_assert (init != NULL_TREE);
6083 else if (!init && DECL_REALLY_EXTERN (decl))
6085 else if (init || type_build_ctor_call (type)
6086 || TREE_CODE (type) == REFERENCE_TYPE)
6088 if (TREE_CODE (type) == REFERENCE_TYPE)
6090 init = grok_reference_init (decl, type, init, flags);
6091 flags |= LOOKUP_ALREADY_DIGESTED;
6094 check_for_uninitialized_const_var (decl);
6095 /* Do not reshape constructors of vectors (they don't need to be
6097 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
6099 if (is_std_init_list (type))
6101 init = perform_implicit_conversion (type, init,
6102 tf_warning_or_error);
6103 flags |= LOOKUP_ALREADY_DIGESTED;
6105 else if (TYPE_NON_AGGREGATE_CLASS (type))
6107 /* Don't reshape if the class has constructors. */
6108 if (cxx_dialect == cxx98)
6109 error ("in C++98 %qD must be initialized by constructor, "
6113 else if (VECTOR_TYPE_P (type) && TYPE_VECTOR_OPAQUE (type))
6115 error ("opaque vector types cannot be initialized");
6116 init = error_mark_node;
6120 init = reshape_init (type, init, tf_warning_or_error);
6121 flags |= LOOKUP_NO_NARROWING;
6124 else if (TREE_CODE (init) == TREE_LIST
6125 && TREE_TYPE (init) != unknown_type_node
6126 && !MAYBE_CLASS_TYPE_P (type))
6128 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
6130 /* We get here with code like `int a (2);' */
6131 init = build_x_compound_expr_from_list (init, ELK_INIT,
6132 tf_warning_or_error);
6135 /* If DECL has an array type without a specific bound, deduce the
6136 array size from the initializer. */
6137 maybe_deduce_size_from_array_init (decl, init);
6138 type = TREE_TYPE (decl);
6139 if (type == error_mark_node)
6142 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
6143 && !(flags & LOOKUP_ALREADY_DIGESTED)
6144 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
6145 && CP_AGGREGATE_TYPE_P (type)
6146 && (CLASS_TYPE_P (type)
6147 || !TYPE_NEEDS_CONSTRUCTING (type)
6148 || type_has_extended_temps (type))))
6150 init_code = build_aggr_init_full_exprs (decl, init, flags);
6152 /* A constructor call is a non-trivial initializer even if
6153 it isn't explicitly written. */
6154 if (TREE_SIDE_EFFECTS (init_code))
6155 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = true;
6157 /* If this is a constexpr initializer, expand_default_init will
6158 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6159 case, pull the initializer back out and pass it down into
6160 store_init_value. */
6161 while (TREE_CODE (init_code) == EXPR_STMT
6162 || TREE_CODE (init_code) == CONVERT_EXPR)
6163 init_code = TREE_OPERAND (init_code, 0);
6164 if (TREE_CODE (init_code) == INIT_EXPR)
6166 init = TREE_OPERAND (init_code, 1);
6167 init_code = NULL_TREE;
6168 /* Don't call digest_init; it's unnecessary and will complain
6169 about aggregate initialization of non-aggregate classes. */
6170 flags |= LOOKUP_ALREADY_DIGESTED;
6172 else if (DECL_DECLARED_CONSTEXPR_P (decl))
6174 /* Declared constexpr, but no suitable initializer; massage
6175 init appropriately so we can pass it into store_init_value
6177 if (CLASS_TYPE_P (type)
6178 && (!init || TREE_CODE (init) == TREE_LIST))
6180 init = build_functional_cast (type, init, tf_none);
6181 if (TREE_CODE (init) == TARGET_EXPR)
6182 TARGET_EXPR_DIRECT_INIT_P (init) = true;
6184 init_code = NULL_TREE;
6190 if (init && TREE_CODE (init) != TREE_VEC)
6192 /* In aggregate initialization of a variable, each element
6193 initialization is a full-expression because there is no
6194 enclosing expression. */
6195 gcc_assert (stmts_are_full_exprs_p ());
6197 init_code = store_init_value (decl, init, cleanups, flags);
6199 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
6200 && DECL_INITIAL (decl)
6201 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
6202 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
6203 warning (0, "array %qD initialized by parenthesized string literal %qE",
6204 decl, DECL_INITIAL (decl));
6210 if (CLASS_TYPE_P (core_type = strip_array_types (type))
6211 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
6212 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
6213 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
6216 check_for_uninitialized_const_var (decl);
6219 if (init && init != error_mark_node)
6220 init_code = build2 (INIT_EXPR, type, decl, init);
6224 /* We might have set these in cp_finish_decl. */
6225 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = false;
6226 TREE_CONSTANT (decl) = false;
6229 if (init_code && DECL_IN_AGGR_P (decl))
6231 static int explained = 0;
6233 if (cxx_dialect < cxx11)
6234 error ("initializer invalid for static member with constructor");
6236 error ("non-constant in-class initialization invalid for static "
6237 "member %qD", decl);
6240 inform (input_location,
6241 "(an out of class initialization is required)");
6250 /* If DECL is not a local variable, give it RTL. */
6253 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
6255 int toplev = toplevel_bindings_p ();
6258 /* Set the DECL_ASSEMBLER_NAME for the object. */
6261 /* The `register' keyword, when used together with an
6262 asm-specification, indicates that the variable should be
6263 placed in a particular register. */
6264 if (VAR_P (decl) && DECL_REGISTER (decl))
6266 set_user_assembler_name (decl, asmspec);
6267 DECL_HARD_REGISTER (decl) = 1;
6271 if (TREE_CODE (decl) == FUNCTION_DECL
6272 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
6273 set_builtin_user_assembler_name (decl, asmspec);
6274 set_user_assembler_name (decl, asmspec);
6278 /* Handle non-variables up front. */
6281 rest_of_decl_compilation (decl, toplev, at_eof);
6285 /* If we see a class member here, it should be a static data
6287 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
6289 gcc_assert (TREE_STATIC (decl));
6290 /* An in-class declaration of a static data member should be
6291 external; it is only a declaration, and not a definition. */
6292 if (init == NULL_TREE)
6293 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
6296 /* We don't create any RTL for local variables. */
6297 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6300 /* We defer emission of local statics until the corresponding
6301 DECL_EXPR is expanded. But with constexpr its function might never
6302 be expanded, so go ahead and tell cgraph about the variable now. */
6303 defer_p = ((DECL_FUNCTION_SCOPE_P (decl)
6304 && !DECL_DECLARED_CONSTEXPR_P (DECL_CONTEXT (decl)))
6305 || DECL_VIRTUAL_P (decl));
6307 /* Defer template instantiations. */
6308 if (DECL_LANG_SPECIFIC (decl)
6309 && DECL_IMPLICIT_INSTANTIATION (decl))
6312 /* If we're not deferring, go ahead and assemble the variable. */
6314 rest_of_decl_compilation (decl, toplev, at_eof);
6317 /* walk_tree helper for wrap_temporary_cleanups, below. */
6320 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
6322 /* Stop at types or full-expression boundaries. */
6323 if (TYPE_P (*stmt_p)
6324 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
6330 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
6332 tree guard = (tree)data;
6333 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
6335 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
6336 /* Tell honor_protect_cleanup_actions to handle this as a separate
6338 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
6340 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
6346 /* We're initializing a local variable which has a cleanup GUARD. If there
6347 are any temporaries used in the initializer INIT of this variable, we
6348 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6349 variable will be cleaned up properly if one of them throws.
6351 Unfortunately, there's no way to express this properly in terms of
6352 nesting, as the regions for the temporaries overlap the region for the
6353 variable itself; if there are two temporaries, the variable needs to be
6354 the first thing destroyed if either of them throws. However, we only
6355 want to run the variable's cleanup if it actually got constructed. So
6356 we need to guard the temporary cleanups with the variable's cleanup if
6357 they are run on the normal path, but not if they are run on the
6358 exceptional path. We implement this by telling
6359 honor_protect_cleanup_actions to strip the variable cleanup from the
6360 exceptional path. */
6363 wrap_temporary_cleanups (tree init, tree guard)
6365 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
6368 /* Generate code to initialize DECL (a local variable). */
6371 initialize_local_var (tree decl, tree init)
6373 tree type = TREE_TYPE (decl);
6377 gcc_assert (VAR_P (decl)
6378 || TREE_CODE (decl) == RESULT_DECL);
6379 gcc_assert (!TREE_STATIC (decl));
6381 if (DECL_SIZE (decl) == NULL_TREE)
6383 /* If we used it already as memory, it must stay in memory. */
6384 DECL_INITIAL (decl) = NULL_TREE;
6385 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
6389 if (type == error_mark_node)
6392 /* Compute and store the initial value. */
6393 already_used = TREE_USED (decl) || TREE_USED (type);
6394 if (TREE_USED (type))
6395 DECL_READ_P (decl) = 1;
6397 /* Generate a cleanup, if necessary. */
6398 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
6400 /* Perform the initialization. */
6403 tree rinit = (TREE_CODE (init) == INIT_EXPR
6404 ? TREE_OPERAND (init, 1) : NULL_TREE);
6405 if (rinit && !TREE_SIDE_EFFECTS (rinit))
6407 /* Stick simple initializers in DECL_INITIAL so that
6408 -Wno-init-self works (c++/34772). */
6409 gcc_assert (TREE_OPERAND (init, 0) == decl);
6410 DECL_INITIAL (decl) = rinit;
6412 if (warn_init_self && TREE_CODE (type) == REFERENCE_TYPE)
6416 warning_at (DECL_SOURCE_LOCATION (decl),
6418 "reference %qD is initialized with itself", decl);
6423 int saved_stmts_are_full_exprs_p;
6425 /* If we're only initializing a single object, guard the
6426 destructors of any temporaries used in its initializer with
6427 its destructor. This isn't right for arrays because each
6428 element initialization is a full-expression. */
6429 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
6430 wrap_temporary_cleanups (init, cleanup);
6432 gcc_assert (building_stmt_list_p ());
6433 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
6434 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
6435 finish_expr_stmt (init);
6436 current_stmt_tree ()->stmts_are_full_exprs_p =
6437 saved_stmts_are_full_exprs_p;
6441 /* Set this to 0 so we can tell whether an aggregate which was
6442 initialized was ever used. Don't do this if it has a
6443 destructor, so we don't complain about the 'resource
6444 allocation is initialization' idiom. Now set
6445 attribute((unused)) on types so decls of that type will be
6446 marked used. (see TREE_USED, above.) */
6447 if (TYPE_NEEDS_CONSTRUCTING (type)
6449 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
6450 && DECL_NAME (decl))
6451 TREE_USED (decl) = 0;
6452 else if (already_used)
6453 TREE_USED (decl) = 1;
6456 finish_decl_cleanup (decl, cleanup);
6459 /* DECL is a VAR_DECL for a compiler-generated variable with static
6460 storage duration (like a virtual table) whose initializer is a
6461 compile-time constant. Initialize the variable and provide it to the
6465 initialize_artificial_var (tree decl, vec<constructor_elt, va_gc> *v)
6468 gcc_assert (DECL_ARTIFICIAL (decl));
6469 init = build_constructor (TREE_TYPE (decl), v);
6470 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
6471 DECL_INITIAL (decl) = init;
6472 DECL_INITIALIZED_P (decl) = 1;
6473 determine_visibility (decl);
6474 layout_var_decl (decl);
6475 maybe_commonize_var (decl);
6476 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
6479 /* INIT is the initializer for a variable, as represented by the
6480 parser. Returns true iff INIT is type-dependent. */
6483 type_dependent_init_p (tree init)
6485 if (TREE_CODE (init) == TREE_LIST)
6486 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6487 return any_type_dependent_elements_p (init);
6488 else if (TREE_CODE (init) == CONSTRUCTOR)
6489 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6491 vec<constructor_elt, va_gc> *elts;
6495 elts = CONSTRUCTOR_ELTS (init);
6496 nelts = vec_safe_length (elts);
6497 for (i = 0; i < nelts; ++i)
6498 if (type_dependent_init_p ((*elts)[i].value))
6502 /* It must be a simple expression, e.g., int i = 3; */
6503 return type_dependent_expression_p (init);
6508 /* INIT is the initializer for a variable, as represented by the
6509 parser. Returns true iff INIT is value-dependent. */
6512 value_dependent_init_p (tree init)
6514 if (TREE_CODE (init) == TREE_LIST)
6515 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6516 return any_value_dependent_elements_p (init);
6517 else if (TREE_CODE (init) == CONSTRUCTOR)
6518 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6520 vec<constructor_elt, va_gc> *elts;
6524 elts = CONSTRUCTOR_ELTS (init);
6525 nelts = vec_safe_length (elts);
6526 for (i = 0; i < nelts; ++i)
6527 if (value_dependent_init_p ((*elts)[i].value))
6531 /* It must be a simple expression, e.g., int i = 3; */
6532 return value_dependent_expression_p (init);
6537 // Returns true if a DECL is VAR_DECL with the concept specifier.
6539 is_concept_var (tree decl)
6541 return (VAR_P (decl)
6542 // Not all variables have DECL_LANG_SPECIFIC.
6543 && DECL_LANG_SPECIFIC (decl)
6544 && DECL_DECLARED_CONCEPT_P (decl));
6547 /* A helper function to be called via walk_tree. If any label exists
6548 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6551 notice_forced_label_r (tree *tp, int *walk_subtrees, void *)
6555 if (TREE_CODE (*tp) == LABEL_DECL)
6556 cfun->has_forced_label_in_static = 1;
6560 /* Finish processing of a declaration;
6561 install its line number and initial value.
6562 If the length of an array type is not known before,
6563 it must be determined now, from the initial value, or it is an error.
6565 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6566 true, then INIT is an integral constant expression.
6568 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6569 if the (init) syntax was used. */
6572 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
6573 tree asmspec_tree, int flags)
6576 vec<tree, va_gc> *cleanups = NULL;
6577 const char *asmspec = NULL;
6578 int was_readonly = 0;
6579 bool var_definition_p = false;
6582 if (decl == error_mark_node)
6587 error ("assignment (not initialization) in declaration");
6591 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
6592 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6593 gcc_assert (TREE_CODE (decl) != PARM_DECL);
6595 type = TREE_TYPE (decl);
6596 if (type == error_mark_node)
6599 /* If a name was specified, get the string. */
6600 if (at_namespace_scope_p ())
6601 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
6602 if (asmspec_tree && asmspec_tree != error_mark_node)
6603 asmspec = TREE_STRING_POINTER (asmspec_tree);
6605 if (current_class_type
6606 && CP_DECL_CONTEXT (decl) == current_class_type
6607 && TYPE_BEING_DEFINED (current_class_type)
6608 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
6609 && (DECL_INITIAL (decl) || init))
6610 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
6612 if (TREE_CODE (decl) != FUNCTION_DECL
6613 && (auto_node = type_uses_auto (type)))
6616 if (init == NULL_TREE)
6618 if (DECL_LANG_SPECIFIC (decl)
6619 && DECL_TEMPLATE_INSTANTIATION (decl)
6620 && !DECL_TEMPLATE_INSTANTIATED (decl))
6622 /* init is null because we're deferring instantiating the
6623 initializer until we need it. Well, we need it now. */
6624 instantiate_decl (decl, /*defer_ok*/true, /*expl*/false);
6628 error ("declaration of %q#D has no initializer", decl);
6629 TREE_TYPE (decl) = error_mark_node;
6633 if (TREE_CODE (d_init) == TREE_LIST)
6634 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6635 tf_warning_or_error);
6636 d_init = resolve_nondeduced_context (d_init, tf_warning_or_error);
6637 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6639 tf_warning_or_error,
6641 if (type == error_mark_node)
6643 if (TREE_CODE (type) == FUNCTION_TYPE)
6645 error ("initializer for %<decltype(auto) %D%> has function type "
6646 "(did you forget the %<()%> ?)", decl);
6647 TREE_TYPE (decl) = error_mark_node;
6650 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
6653 if (!ensure_literal_type_for_constexpr_object (decl))
6654 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6657 && DECL_CLASS_SCOPE_P (decl)
6658 && DECL_INITIALIZED_IN_CLASS_P (decl))
6659 check_static_variable_definition (decl, type);
6661 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6664 if (init == ridpointers[(int)RID_DELETE])
6666 /* FIXME check this is 1st decl. */
6667 DECL_DELETED_FN (decl) = 1;
6668 DECL_DECLARED_INLINE_P (decl) = 1;
6669 DECL_INITIAL (decl) = error_mark_node;
6670 FOR_EACH_CLONE (clone, decl)
6672 DECL_DELETED_FN (clone) = 1;
6673 DECL_DECLARED_INLINE_P (clone) = 1;
6674 DECL_INITIAL (clone) = error_mark_node;
6678 else if (init == ridpointers[(int)RID_DEFAULT])
6680 if (defaultable_fn_check (decl))
6681 DECL_DEFAULTED_FN (decl) = 1;
6683 DECL_INITIAL (decl) = NULL_TREE;
6687 if (init && VAR_P (decl))
6689 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6690 /* If DECL is a reference, then we want to know whether init is a
6691 reference constant; init_const_expr_p as passed tells us whether
6692 it's an rvalue constant. */
6693 if (TREE_CODE (type) == REFERENCE_TYPE)
6694 init_const_expr_p = potential_constant_expression (init);
6695 if (init_const_expr_p)
6697 /* Set these flags now for templates. We'll update the flags in
6698 store_init_value for instantiations. */
6699 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6700 if (decl_maybe_constant_var_p (decl))
6701 TREE_CONSTANT (decl) = 1;
6705 if (processing_template_decl)
6707 bool type_dependent_p;
6709 /* Add this declaration to the statement-tree. */
6710 if (at_function_scope_p ())
6711 add_decl_expr (decl);
6713 type_dependent_p = dependent_type_p (type);
6715 if (check_for_bare_parameter_packs (init))
6718 DECL_INITIAL (decl) = NULL_TREE;
6721 /* Generally, initializers in templates are expanded when the
6722 template is instantiated. But, if DECL is a variable constant
6723 then it can be used in future constant expressions, so its value
6724 must be available. */
6726 if (!VAR_P (decl) || type_dependent_p)
6727 /* We can't do anything if the decl has dependent type. */;
6729 && init_const_expr_p
6730 && TREE_CODE (type) != REFERENCE_TYPE
6731 && decl_maybe_constant_var_p (decl)
6732 && !type_dependent_init_p (init)
6733 && !value_dependent_init_p (init))
6735 /* This variable seems to be a non-dependent constant, so process
6736 its initializer. If check_initializer returns non-null the
6737 initialization wasn't constant after all. */
6739 cleanups = make_tree_vector ();
6740 init_code = check_initializer (decl, init, flags, &cleanups);
6741 if (init_code == NULL_TREE)
6743 release_tree_vector (cleanups);
6745 else if (!init && is_concept_var (decl))
6746 error ("variable concept has no initializer");
6747 else if (!DECL_PRETTY_FUNCTION_P (decl))
6749 /* Deduce array size even if the initializer is dependent. */
6750 maybe_deduce_size_from_array_init (decl, init);
6751 /* And complain about multiple initializers. */
6752 if (init && TREE_CODE (init) == TREE_LIST && TREE_CHAIN (init)
6753 && !MAYBE_CLASS_TYPE_P (type))
6754 init = build_x_compound_expr_from_list (init, ELK_INIT,
6755 tf_warning_or_error);
6759 DECL_INITIAL (decl) = init;
6763 /* Just store non-static data member initializers for later. */
6764 if (init && TREE_CODE (decl) == FIELD_DECL)
6765 DECL_INITIAL (decl) = init;
6767 /* Take care of TYPE_DECLs up front. */
6768 if (TREE_CODE (decl) == TYPE_DECL)
6770 if (type != error_mark_node
6771 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6773 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6774 warning (0, "shadowing previous type declaration of %q#D", decl);
6775 set_identifier_type_value (DECL_NAME (decl), decl);
6778 /* If we have installed this as the canonical typedef for this
6779 type, and that type has not been defined yet, delay emitting
6780 the debug information for it, as we will emit it later. */
6781 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6782 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6783 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6785 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6790 /* A reference will be modified here, as it is initialized. */
6791 if (! DECL_EXTERNAL (decl)
6792 && TREE_READONLY (decl)
6793 && TREE_CODE (type) == REFERENCE_TYPE)
6796 TREE_READONLY (decl) = 0;
6801 /* If this is a local variable that will need a mangled name,
6802 register it now. We must do this before processing the
6803 initializer for the variable, since the initialization might
6804 require a guard variable, and since the mangled name of the
6805 guard variable will depend on the mangled name of this
6807 if (DECL_FUNCTION_SCOPE_P (decl)
6808 && TREE_STATIC (decl)
6809 && !DECL_ARTIFICIAL (decl))
6811 push_local_name (decl);
6812 /* Normally has_forced_label_in_static is set during GIMPLE
6813 lowering, but [cd]tors are never actually compiled directly.
6814 We need to set this early so we can deal with the label
6815 address extension. */
6816 if ((DECL_CONSTRUCTOR_P (current_function_decl)
6817 || DECL_DESTRUCTOR_P (current_function_decl))
6820 walk_tree (&init, notice_forced_label_r, NULL, NULL);
6821 add_local_decl (cfun, decl);
6823 /* And make sure it's in the symbol table for
6824 c_parse_final_cleanups to find. */
6825 varpool_node::get_create (decl);
6828 /* Convert the initializer to the type of DECL, if we have not
6829 already initialized DECL. */
6830 if (!DECL_INITIALIZED_P (decl)
6831 /* If !DECL_EXTERNAL then DECL is being defined. In the
6832 case of a static data member initialized inside the
6833 class-specifier, there can be an initializer even if DECL
6834 is *not* defined. */
6835 && (!DECL_EXTERNAL (decl) || init))
6837 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6840 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6841 /* Allow libjava/prims.cc define primitive classes. */
6842 if (init != NULL_TREE
6843 || jclass == NULL_TREE
6844 || TREE_CODE (jclass) != TYPE_DECL
6845 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6846 || !same_type_ignoring_top_level_qualifiers_p
6847 (type, TREE_TYPE (TREE_TYPE (jclass))))
6848 error ("Java object %qD not allocated with %<new%>", decl);
6851 cleanups = make_tree_vector ();
6852 init = check_initializer (decl, init, flags, &cleanups);
6858 The memory occupied by any object of static storage
6859 duration is zero-initialized at program startup before
6860 any other initialization takes place.
6862 We cannot create an appropriate initializer until after
6863 the type of DECL is finalized. If DECL_INITIAL is set,
6864 then the DECL is statically initialized, and any
6865 necessary zero-initialization has already been performed. */
6866 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6867 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6868 /*nelts=*/NULL_TREE,
6869 /*static_storage_p=*/true);
6870 /* Remember that the initialization for this variable has
6872 DECL_INITIALIZED_P (decl) = 1;
6873 /* This declaration is the definition of this variable,
6874 unless we are initializing a static data member within
6875 the class specifier. */
6876 if (!DECL_EXTERNAL (decl))
6877 var_definition_p = true;
6879 /* If the variable has an array type, lay out the type, even if
6880 there is no initializer. It is valid to index through the
6881 array, and we must get TYPE_ALIGN set correctly on the array
6883 else if (TREE_CODE (type) == ARRAY_TYPE)
6886 if (TREE_STATIC (decl)
6887 && !at_function_scope_p ()
6888 && current_function_decl == NULL)
6889 /* So decl is a global variable or a static member of a
6890 non local class. Record the types it uses
6891 so that we can decide later to emit debug info for them. */
6892 record_types_used_by_current_var_decl (decl);
6894 else if (TREE_CODE (decl) == FIELD_DECL
6895 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6896 error ("non-static data member %qD has Java class type", decl);
6898 /* Add this declaration to the statement-tree. This needs to happen
6899 after the call to check_initializer so that the DECL_EXPR for a
6900 reference temp is added before the DECL_EXPR for the reference itself. */
6901 if (DECL_FUNCTION_SCOPE_P (decl))
6903 /* If we're building a variable sized type, and we might be
6904 reachable other than via the top of the current binding
6905 level, then create a new BIND_EXPR so that we deallocate
6906 the object at the right time. */
6909 && !TREE_CONSTANT (DECL_SIZE (decl))
6910 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
6913 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
6914 TREE_SIDE_EFFECTS (bind) = 1;
6916 BIND_EXPR_BODY (bind) = push_stmt_list ();
6918 add_decl_expr (decl);
6921 /* Let the middle end know about variables and functions -- but not
6922 static data members in uninstantiated class templates. */
6923 if (VAR_OR_FUNCTION_DECL_P (decl))
6927 layout_var_decl (decl);
6928 maybe_commonize_var (decl);
6931 /* This needs to happen after the linkage is set. */
6932 determine_visibility (decl);
6934 if (var_definition_p && TREE_STATIC (decl))
6936 /* If a TREE_READONLY variable needs initialization
6937 at runtime, it is no longer readonly and we need to
6938 avoid MEM_READONLY_P being set on RTL created for it. */
6941 if (TREE_READONLY (decl))
6942 TREE_READONLY (decl) = 0;
6945 else if (was_readonly)
6946 TREE_READONLY (decl) = 1;
6948 /* Likewise if it needs destruction. */
6949 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
6950 TREE_READONLY (decl) = 0;
6953 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6955 /* Check for abstractness of the type. Notice that there is no
6956 need to strip array types here since the check for those types
6957 is already done within create_array_type_for_decl. */
6958 abstract_virtuals_error (decl, type);
6960 if (TREE_TYPE (decl) == error_mark_node)
6961 /* No initialization required. */
6963 else if (TREE_CODE (decl) == FUNCTION_DECL)
6967 if (init == ridpointers[(int)RID_DEFAULT])
6969 /* An out-of-class default definition is defined at
6970 the point where it is explicitly defaulted. */
6971 if (DECL_DELETED_FN (decl))
6972 maybe_explain_implicit_delete (decl);
6973 else if (DECL_INITIAL (decl) == error_mark_node)
6974 synthesize_method (decl);
6977 error ("function %q#D is initialized like a variable", decl);
6979 /* else no initialization required. */
6981 else if (DECL_EXTERNAL (decl)
6982 && ! (DECL_LANG_SPECIFIC (decl)
6983 && DECL_NOT_REALLY_EXTERN (decl)))
6986 DECL_INITIAL (decl) = init;
6988 /* A variable definition. */
6989 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6990 /* Initialize the local variable. */
6991 initialize_local_var (decl, init);
6993 /* If a variable is defined, and then a subsequent
6994 definition with external linkage is encountered, we will
6995 get here twice for the same variable. We want to avoid
6996 calling expand_static_init more than once. For variables
6997 that are not static data members, we can call
6998 expand_static_init only when we actually process the
6999 initializer. It is not legal to redeclare a static data
7000 member, so this issue does not arise in that case. */
7001 else if (var_definition_p && TREE_STATIC (decl))
7002 expand_static_init (decl, init);
7005 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7006 reference, insert it in the statement-tree now. */
7010 FOR_EACH_VEC_ELT (*cleanups, i, t)
7011 push_cleanup (decl, t, false);
7012 release_tree_vector (cleanups);
7016 TREE_READONLY (decl) = 1;
7018 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
7021 /* Returns a declaration for a VAR_DECL as if:
7023 extern "C" TYPE NAME;
7025 had been seen. Used to create compiler-generated global
7029 declare_global_var (tree name, tree type)
7033 push_to_top_level ();
7034 decl = build_decl (input_location, VAR_DECL, name, type);
7035 TREE_PUBLIC (decl) = 1;
7036 DECL_EXTERNAL (decl) = 1;
7037 DECL_ARTIFICIAL (decl) = 1;
7038 /* If the user has explicitly declared this variable (perhaps
7039 because the code we are compiling is part of a low-level runtime
7040 library), then it is possible that our declaration will be merged
7041 with theirs by pushdecl. */
7042 decl = pushdecl (decl);
7043 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
7044 pop_from_top_level ();
7049 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7050 if "__cxa_atexit" is not being used) corresponding to the function
7051 to be called when the program exits. */
7054 get_atexit_fn_ptr_type (void)
7058 if (!atexit_fn_ptr_type_node)
7061 if (flag_use_cxa_atexit
7062 && !targetm.cxx.use_atexit_for_cxa_atexit ())
7063 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7064 arg_type = ptr_type_node;
7066 /* The parameter to "atexit" is "void (*)(void)". */
7067 arg_type = NULL_TREE;
7069 fn_type = build_function_type_list (void_type_node,
7070 arg_type, NULL_TREE);
7071 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
7074 return atexit_fn_ptr_type_node;
7077 /* Returns a pointer to the `atexit' function. Note that if
7078 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7079 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7082 get_atexit_node (void)
7088 bool use_aeabi_atexit;
7093 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
7095 /* The declaration for `__cxa_atexit' is:
7097 int __cxa_atexit (void (*)(void *), void *, void *)
7099 We build up the argument types and then the function type
7101 tree argtype0, argtype1, argtype2;
7103 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
7104 /* First, build the pointer-to-function type for the first
7106 fn_ptr_type = get_atexit_fn_ptr_type ();
7107 /* Then, build the rest of the argument types. */
7108 argtype2 = ptr_type_node;
7109 if (use_aeabi_atexit)
7111 argtype1 = fn_ptr_type;
7112 argtype0 = ptr_type_node;
7116 argtype1 = ptr_type_node;
7117 argtype0 = fn_ptr_type;
7119 /* And the final __cxa_atexit type. */
7120 fn_type = build_function_type_list (integer_type_node,
7121 argtype0, argtype1, argtype2,
7123 if (use_aeabi_atexit)
7124 name = "__aeabi_atexit";
7126 name = "__cxa_atexit";
7130 /* The declaration for `atexit' is:
7132 int atexit (void (*)());
7134 We build up the argument types and then the function type
7136 fn_ptr_type = get_atexit_fn_ptr_type ();
7137 /* Build the final atexit type. */
7138 fn_type = build_function_type_list (integer_type_node,
7139 fn_ptr_type, NULL_TREE);
7143 /* Now, build the function declaration. */
7144 push_lang_context (lang_name_c);
7145 atexit_fndecl = build_library_fn_ptr (name, fn_type, ECF_LEAF | ECF_NOTHROW);
7146 mark_used (atexit_fndecl);
7147 pop_lang_context ();
7148 atexit_node = decay_conversion (atexit_fndecl, tf_warning_or_error);
7153 /* Like get_atexit_node, but for thread-local cleanups. */
7156 get_thread_atexit_node (void)
7158 /* The declaration for `__cxa_thread_atexit' is:
7160 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7161 tree fn_type = build_function_type_list (integer_type_node,
7162 get_atexit_fn_ptr_type (),
7163 ptr_type_node, ptr_type_node,
7166 /* Now, build the function declaration. */
7167 tree atexit_fndecl = build_library_fn_ptr ("__cxa_thread_atexit", fn_type,
7168 ECF_LEAF | ECF_NOTHROW);
7169 return decay_conversion (atexit_fndecl, tf_warning_or_error);
7172 /* Returns the __dso_handle VAR_DECL. */
7175 get_dso_handle_node (void)
7177 if (dso_handle_node)
7178 return dso_handle_node;
7180 /* Declare the variable. */
7181 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
7184 #ifdef HAVE_GAS_HIDDEN
7185 if (dso_handle_node != error_mark_node)
7187 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
7188 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
7192 return dso_handle_node;
7195 /* Begin a new function with internal linkage whose job will be simply
7196 to destroy some particular variable. */
7198 static GTY(()) int start_cleanup_cnt;
7201 start_cleanup_fn (void)
7206 bool use_cxa_atexit = flag_use_cxa_atexit
7207 && !targetm.cxx.use_atexit_for_cxa_atexit ();
7209 push_to_top_level ();
7211 /* No need to mangle this. */
7212 push_lang_context (lang_name_c);
7214 /* Build the name of the function. */
7215 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
7216 /* Build the function declaration. */
7217 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
7218 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
7219 /* It's a function with internal linkage, generated by the
7221 TREE_PUBLIC (fndecl) = 0;
7222 DECL_ARTIFICIAL (fndecl) = 1;
7223 /* Make the function `inline' so that it is only emitted if it is
7224 actually needed. It is unlikely that it will be inlined, since
7225 it is only called via a function pointer, but we avoid unnecessary
7226 emissions this way. */
7227 DECL_DECLARED_INLINE_P (fndecl) = 1;
7228 DECL_INTERFACE_KNOWN (fndecl) = 1;
7229 /* Build the parameter. */
7234 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
7235 DECL_CONTEXT (parmdecl) = fndecl;
7236 TREE_USED (parmdecl) = 1;
7237 DECL_READ_P (parmdecl) = 1;
7238 DECL_ARGUMENTS (fndecl) = parmdecl;
7242 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
7244 pop_lang_context ();
7246 return current_function_decl;
7249 /* Finish the cleanup function begun by start_cleanup_fn. */
7252 end_cleanup_fn (void)
7254 expand_or_defer_fn (finish_function (0));
7256 pop_from_top_level ();
7259 /* Generate code to handle the destruction of DECL, an object with
7260 static storage duration. */
7263 register_dtor_fn (tree decl)
7270 bool ob_parm, dso_parm, use_dtor;
7271 tree arg0, arg1, arg2;
7274 type = TREE_TYPE (decl);
7275 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
7278 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7279 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7280 destructor to "__cxa_atexit"; we don't have to build a temporary
7281 function to do the cleanup. */
7282 dso_parm = (flag_use_cxa_atexit
7283 && !targetm.cxx.use_atexit_for_cxa_atexit ());
7284 ob_parm = (CP_DECL_THREAD_LOCAL_P (decl) || dso_parm);
7285 use_dtor = ob_parm && CLASS_TYPE_P (type);
7290 /* Find the destructor. */
7291 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
7292 gcc_assert (idx >= 0);
7293 cleanup = (*CLASSTYPE_METHOD_VEC (type))[idx];
7294 /* Make sure it is accessible. */
7295 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup,
7296 tf_warning_or_error);
7300 /* Call build_cleanup before we enter the anonymous function so
7301 that any access checks will be done relative to the current
7302 scope, rather than the scope of the anonymous function. */
7303 build_cleanup (decl);
7305 /* Now start the function. */
7306 cleanup = start_cleanup_fn ();
7308 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7309 to the original function, rather than the anonymous one. That
7310 will make the back end think that nested functions are in use,
7311 which causes confusion. */
7312 push_deferring_access_checks (dk_no_check);
7313 fcall = build_cleanup (decl);
7314 pop_deferring_access_checks ();
7316 /* Create the body of the anonymous function. */
7317 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
7318 finish_expr_stmt (fcall);
7319 finish_compound_stmt (compound_stmt);
7323 /* Call atexit with the cleanup function. */
7324 mark_used (cleanup);
7325 cleanup = build_address (cleanup);
7327 if (CP_DECL_THREAD_LOCAL_P (decl))
7328 atex_node = get_thread_atexit_node ();
7330 atex_node = get_atexit_node ();
7334 /* We must convert CLEANUP to the type that "__cxa_atexit"
7336 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
7337 /* "__cxa_atexit" will pass the address of DECL to the
7338 cleanup function. */
7340 addr = build_address (decl);
7341 /* The declared type of the parameter to "__cxa_atexit" is
7342 "void *". For plain "T*", we could just let the
7343 machinery in cp_build_function_call convert it -- but if the
7344 type is "cv-qualified T *", then we need to convert it
7345 before passing it in, to avoid spurious errors. */
7346 addr = build_nop (ptr_type_node, addr);
7349 /* Since the cleanup functions we build ignore the address
7350 they're given, there's no reason to pass the actual address
7351 in, and, in general, it's cheaper to pass NULL than any
7353 addr = null_pointer_node;
7356 arg2 = cp_build_addr_expr (get_dso_handle_node (),
7357 tf_warning_or_error);
7359 /* Just pass NULL to the dso handle parm if we don't actually
7360 have a DSO handle on this target. */
7361 arg2 = null_pointer_node;
7367 if (!CP_DECL_THREAD_LOCAL_P (decl)
7368 && targetm.cxx.use_aeabi_atexit ())
7384 return cp_build_function_call_nary (atex_node, tf_warning_or_error,
7385 arg0, arg1, arg2, NULL_TREE);
7388 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7389 is its initializer. Generate code to handle the construction
7390 and destruction of DECL. */
7393 expand_static_init (tree decl, tree init)
7395 gcc_assert (VAR_P (decl));
7396 gcc_assert (TREE_STATIC (decl));
7398 /* Some variables require no dynamic initialization. */
7399 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
7401 /* Make sure the destructor is callable. */
7402 cxx_maybe_build_cleanup (decl, tf_warning_or_error);
7407 if (CP_DECL_THREAD_LOCAL_P (decl) && DECL_GNU_TLS_P (decl)
7408 && !DECL_FUNCTION_SCOPE_P (decl))
7411 error ("non-local variable %qD declared %<__thread%> "
7412 "needs dynamic initialization", decl);
7414 error ("non-local variable %qD declared %<__thread%> "
7415 "has a non-trivial destructor", decl);
7416 static bool informed;
7419 inform (DECL_SOURCE_LOCATION (decl),
7420 "C++11 %<thread_local%> allows dynamic initialization "
7427 if (DECL_FUNCTION_SCOPE_P (decl))
7429 /* Emit code to perform this initialization but once. */
7430 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
7431 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
7432 tree guard, guard_addr;
7434 /* We don't need thread-safety code for thread-local vars. */
7435 bool thread_guard = (flag_threadsafe_statics
7436 && !CP_DECL_THREAD_LOCAL_P (decl));
7438 /* Emit code to perform this initialization but once. This code
7441 static <type> guard;
7442 if (!__atomic_load (guard.first_byte)) {
7443 if (__cxa_guard_acquire (&guard)) {
7446 // Do initialization.
7447 flag = true; __cxa_guard_release (&guard);
7448 // Register variable for destruction at end of program.
7450 if (!flag) __cxa_guard_abort (&guard);
7454 Note that the `flag' variable is only set to 1 *after* the
7455 initialization is complete. This ensures that an exception,
7456 thrown during the construction, will cause the variable to
7457 reinitialized when we pass through this code again, as per:
7461 If the initialization exits by throwing an exception, the
7462 initialization is not complete, so it will be tried again
7463 the next time control enters the declaration.
7465 This process should be thread-safe, too; multiple threads
7466 should not be able to initialize the variable more than
7469 /* Create the guard variable. */
7470 guard = get_guard (decl);
7472 /* Begin the conditional initialization. */
7473 if_stmt = begin_if_stmt ();
7475 finish_if_stmt_cond (get_guard_cond (guard, thread_guard), if_stmt);
7476 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
7480 tree vfntype = NULL_TREE;
7481 tree acquire_name, release_name, abort_name;
7482 tree acquire_fn, release_fn, abort_fn;
7483 guard_addr = build_address (guard);
7485 acquire_name = get_identifier ("__cxa_guard_acquire");
7486 release_name = get_identifier ("__cxa_guard_release");
7487 abort_name = get_identifier ("__cxa_guard_abort");
7488 acquire_fn = identifier_global_value (acquire_name);
7489 release_fn = identifier_global_value (release_name);
7490 abort_fn = identifier_global_value (abort_name);
7492 acquire_fn = push_library_fn
7493 (acquire_name, build_function_type_list (integer_type_node,
7494 TREE_TYPE (guard_addr),
7496 NULL_TREE, ECF_NOTHROW | ECF_LEAF);
7497 if (!release_fn || !abort_fn)
7498 vfntype = build_function_type_list (void_type_node,
7499 TREE_TYPE (guard_addr),
7502 release_fn = push_library_fn (release_name, vfntype, NULL_TREE,
7503 ECF_NOTHROW | ECF_LEAF);
7505 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE,
7506 ECF_NOTHROW | ECF_LEAF);
7508 inner_if_stmt = begin_if_stmt ();
7509 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
7512 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
7513 begin = get_target_expr (boolean_false_node);
7514 flag = TARGET_EXPR_SLOT (begin);
7516 TARGET_EXPR_CLEANUP (begin)
7517 = build3 (COND_EXPR, void_type_node, flag,
7519 build_call_n (abort_fn, 1, guard_addr));
7520 CLEANUP_EH_ONLY (begin) = 1;
7522 /* Do the initialization itself. */
7523 init = add_stmt_to_compound (begin, init);
7524 init = add_stmt_to_compound
7525 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
7526 init = add_stmt_to_compound
7527 (init, build_call_n (release_fn, 1, guard_addr));
7530 init = add_stmt_to_compound (init, set_guard (guard));
7532 /* Use atexit to register a function for destroying this static
7534 init = add_stmt_to_compound (init, register_dtor_fn (decl));
7536 finish_expr_stmt (init);
7540 finish_compound_stmt (inner_then_clause);
7541 finish_then_clause (inner_if_stmt);
7542 finish_if_stmt (inner_if_stmt);
7545 finish_compound_stmt (then_clause);
7546 finish_then_clause (if_stmt);
7547 finish_if_stmt (if_stmt);
7549 else if (CP_DECL_THREAD_LOCAL_P (decl))
7550 tls_aggregates = tree_cons (init, decl, tls_aggregates);
7552 static_aggregates = tree_cons (init, decl, static_aggregates);
7556 /* Make TYPE a complete type based on INITIAL_VALUE.
7557 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
7558 2 if there was no information (in which case assume 0 if DO_DEFAULT),
7559 3 if the initializer list is empty (in pedantic mode). */
7562 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
7565 tree type, elt_type;
7567 /* Don't get confused by a CONSTRUCTOR for some other type. */
7568 if (initial_value && TREE_CODE (initial_value) == CONSTRUCTOR
7569 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value)
7570 && TREE_CODE (TREE_TYPE (initial_value)) != ARRAY_TYPE)
7575 unsigned HOST_WIDE_INT i;
7578 /* An array of character type can be initialized from a
7579 brace-enclosed string constant.
7581 FIXME: this code is duplicated from reshape_init. Probably
7582 we should just call reshape_init here? */
7583 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
7584 && TREE_CODE (initial_value) == CONSTRUCTOR
7585 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value)))
7587 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initial_value);
7588 tree value = (*v)[0].value;
7590 if (TREE_CODE (value) == STRING_CST
7591 && v->length () == 1)
7592 initial_value = value;
7595 /* If any of the elements are parameter packs, we can't actually
7596 complete this type now because the array size is dependent. */
7597 if (TREE_CODE (initial_value) == CONSTRUCTOR)
7599 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
7602 if (PACK_EXPANSION_P (value))
7608 failure = complete_array_type (ptype, initial_value, do_default);
7610 /* We can create the array before the element type is complete, which
7611 means that we didn't have these two bits set in the original type
7612 either. In completing the type, we are expected to propagate these
7613 bits. See also complete_type which does the same thing for arrays
7616 if (TYPE_DOMAIN (type))
7618 elt_type = TREE_TYPE (type);
7619 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
7620 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
7621 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
7627 /* As above, but either give an error or reject zero-size arrays, depending
7631 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
7632 bool do_default, tsubst_flags_t complain)
7635 bool sfinae = !(complain & tf_error);
7636 /* In SFINAE context we can't be lenient about zero-size arrays. */
7639 failure = cp_complete_array_type (ptype, initial_value, do_default);
7645 /* Not an error. */;
7646 else if (failure == 1)
7647 error ("initializer fails to determine size of %qT", *ptype);
7648 else if (failure == 2)
7651 error ("array size missing in %qT", *ptype);
7653 else if (failure == 3)
7654 error ("zero-size array %qT", *ptype);
7655 *ptype = error_mark_node;
7660 /* Return zero if something is declared to be a member of type
7661 CTYPE when in the context of CUR_TYPE. STRING is the error
7662 message to print in that case. Otherwise, quietly return 1. */
7665 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
7667 if (ctype && ctype != cur_type)
7669 if (flags == DTOR_FLAG)
7670 error ("destructor for alien class %qT cannot be a member", ctype);
7672 error ("constructor for alien class %qT cannot be a member", ctype);
7678 /* Subroutine of `grokdeclarator'. */
7680 /* Generate errors possibly applicable for a given set of specifiers.
7681 This is for ARM $7.1.2. */
7684 bad_specifiers (tree object,
7685 enum bad_spec_place type,
7696 error ("%qD declared as a %<virtual%> variable", object);
7698 error ("%qD declared as an %<inline%> variable", object);
7700 error ("%<const%> and %<volatile%> function specifiers on "
7701 "%qD invalid in variable declaration", object);
7705 error ("%qD declared as a %<virtual%> parameter", object);
7707 error ("%qD declared as an %<inline%> parameter", object);
7709 error ("%<const%> and %<volatile%> function specifiers on "
7710 "%qD invalid in parameter declaration", object);
7714 error ("%qD declared as a %<virtual%> type", object);
7716 error ("%qD declared as an %<inline%> type", object);
7718 error ("%<const%> and %<volatile%> function specifiers on "
7719 "%qD invalid in type declaration", object);
7723 error ("%qD declared as a %<virtual%> field", object);
7725 error ("%qD declared as an %<inline%> field", object);
7727 error ("%<const%> and %<volatile%> function specifiers on "
7728 "%qD invalid in field declaration", object);
7734 error ("%q+D declared as a friend", object);
7736 && (TREE_CODE (object) == TYPE_DECL
7737 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7738 && !TYPE_REFFN_P (TREE_TYPE (object))
7739 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7740 error ("%q+D declared with an exception specification", object);
7743 /* DECL is a member function or static data member and is presently
7744 being defined. Check that the definition is taking place in a
7748 check_class_member_definition_namespace (tree decl)
7750 /* These checks only apply to member functions and static data
7752 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
7753 /* We check for problems with specializations in pt.c in
7754 check_specialization_namespace, where we can issue better
7756 if (processing_specialization)
7758 /* There are no restrictions on the placement of
7759 explicit instantiations. */
7760 if (processing_explicit_instantiation)
7764 A member function definition that appears outside of the
7765 class definition shall appear in a namespace scope enclosing
7766 the class definition.
7770 The definition for a static data member shall appear in a
7771 namespace scope enclosing the member's class definition. */
7772 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7773 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7774 decl, DECL_CONTEXT (decl));
7777 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7778 METHOD_TYPE for a non-static member function; QUALS are the
7779 cv-qualifiers that apply to the function. */
7782 build_this_parm (tree type, cp_cv_quals quals)
7787 cp_cv_quals this_quals;
7789 if (CLASS_TYPE_P (type))
7792 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7793 this_type = build_pointer_type (this_type);
7796 this_type = type_of_this_parm (type);
7797 /* The `this' parameter is implicitly `const'; it cannot be
7799 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7800 qual_type = cp_build_qualified_type (this_type, this_quals);
7801 parm = build_artificial_parm (this_identifier, qual_type);
7802 cp_apply_type_quals_to_decl (this_quals, parm);
7806 /* DECL is a static member function. Complain if it was declared
7807 with function-cv-quals. */
7810 check_static_quals (tree decl, cp_cv_quals quals)
7812 if (quals != TYPE_UNQUALIFIED)
7813 error ("static member function %q#D declared with type qualifiers",
7817 // Check that FN takes no arguments and returns bool.
7819 check_concept_fn (tree fn)
7821 // A constraint is nullary.
7822 if (DECL_ARGUMENTS (fn))
7823 error ("concept %q#D declared with function parameters", fn);
7825 // The declared return type of the concept shall be bool, and
7826 // it shall not be deduced from it definition.
7827 tree type = TREE_TYPE (TREE_TYPE (fn));
7829 error ("concept %q#D declared with a deduced return type", fn);
7830 else if (type != boolean_type_node)
7831 error ("concept %q#D with non-%<bool%> return type %qT", fn, type);
7834 /* Helper function. Replace the temporary this parameter injected
7835 during cp_finish_omp_declare_simd with the real this parameter. */
7838 declare_simd_adjust_this (tree *tp, int *walk_subtrees, void *data)
7840 tree this_parm = (tree) data;
7841 if (TREE_CODE (*tp) == PARM_DECL
7842 && DECL_NAME (*tp) == this_identifier
7843 && *tp != this_parm)
7845 else if (TYPE_P (*tp))
7850 /* CTYPE is class type, or null if non-class.
7851 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7853 DECLARATOR is the function's name.
7854 PARMS is a chain of PARM_DECLs for the function.
7855 VIRTUALP is truthvalue of whether the function is virtual or not.
7856 FLAGS are to be passed through to `grokclassfn'.
7857 QUALS are qualifiers indicating whether the function is `const'
7859 RAISES is a list of exceptions that this function can raise.
7860 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7861 not look, and -1 if we should not call `grokclassfn' at all.
7863 SFK is the kind of special function (if any) for the new function.
7865 Returns `NULL_TREE' if something goes wrong, after issuing
7866 applicable error messages. */
7869 grokfndecl (tree ctype,
7873 tree orig_declarator,
7876 enum overload_flags flags,
7878 cp_ref_qualifier rqual,
7885 special_function_kind sfk,
7890 location_t location)
7893 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7896 // Was the concept specifier present?
7897 bool concept_p = inlinep & 4;
7899 // Concept declarations must have a corresponding definition.
7900 if (concept_p && !funcdef_flag)
7902 error ("concept %qD has no definition", declarator);
7907 type = build_ref_qualified_type (type, rqual);
7909 type = build_exception_variant (type, raises);
7911 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7913 /* Set the constraints on the declaration. */
7916 tree tmpl_reqs = NULL_TREE;
7917 if (processing_template_decl > template_class_depth (ctype))
7918 tmpl_reqs = TEMPLATE_PARMS_CONSTRAINTS (current_template_parms);
7920 /* Adjust the required expression into a constraint. */
7922 decl_reqs = normalize_expression (decl_reqs);
7924 tree ci = build_constraints (tmpl_reqs, decl_reqs);
7925 set_constraints (decl, ci);
7928 /* If we have an explicit location, use it, otherwise use whatever
7929 build_lang_decl used (probably input_location). */
7930 if (location != UNKNOWN_LOCATION)
7931 DECL_SOURCE_LOCATION (decl) = location;
7933 if (TREE_CODE (type) == METHOD_TYPE)
7936 parm = build_this_parm (type, quals);
7937 DECL_CHAIN (parm) = parms;
7940 /* Allocate space to hold the vptr bit if needed. */
7941 DECL_ALIGN (decl) = MINIMUM_METHOD_BOUNDARY;
7943 DECL_ARGUMENTS (decl) = parms;
7944 for (t = parms; t; t = DECL_CHAIN (t))
7945 DECL_CONTEXT (t) = decl;
7946 /* Propagate volatile out from type to decl. */
7947 if (TYPE_VOLATILE (type))
7948 TREE_THIS_VOLATILE (decl) = 1;
7950 /* Setup decl according to sfk. */
7953 case sfk_constructor:
7954 case sfk_copy_constructor:
7955 case sfk_move_constructor:
7956 DECL_CONSTRUCTOR_P (decl) = 1;
7958 case sfk_destructor:
7959 DECL_DESTRUCTOR_P (decl) = 1;
7966 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7970 ("defining explicit specialization %qD in friend declaration",
7974 tree fns = TREE_OPERAND (orig_declarator, 0);
7975 tree args = TREE_OPERAND (orig_declarator, 1);
7977 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7979 /* Something like `template <class T> friend void f<T>()'. */
7980 error ("invalid use of template-id %qD in declaration "
7981 "of primary template",
7987 /* A friend declaration of the form friend void f<>(). Record
7988 the information in the TEMPLATE_ID_EXPR. */
7989 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7991 gcc_assert (identifier_p (fns) || TREE_CODE (fns) == OVERLOAD);
7992 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7994 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7995 if (TREE_PURPOSE (t)
7996 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7998 error ("default arguments are not allowed in declaration "
7999 "of friend template specialization %qD",
8006 error ("%<inline%> is not allowed in declaration of friend "
8007 "template specialization %qD",
8014 /* If this decl has namespace scope, set that up. */
8016 set_decl_namespace (decl, in_namespace, friendp);
8018 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
8020 /* `main' and builtins have implicit 'C' linkage. */
8021 if ((MAIN_NAME_P (declarator)
8022 || (IDENTIFIER_LENGTH (declarator) > 10
8023 && IDENTIFIER_POINTER (declarator)[0] == '_'
8024 && IDENTIFIER_POINTER (declarator)[1] == '_'
8025 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0)
8026 || (targetcm.cxx_implicit_extern_c
8027 && targetcm.cxx_implicit_extern_c(IDENTIFIER_POINTER (declarator))))
8028 && current_lang_name == lang_name_cplusplus
8029 && ctype == NULL_TREE
8030 && DECL_FILE_SCOPE_P (decl))
8031 SET_DECL_LANGUAGE (decl, lang_c);
8033 /* Should probably propagate const out from type to decl I bet (mrs). */
8036 DECL_STATIC_FUNCTION_P (decl) = 1;
8037 DECL_CONTEXT (decl) = ctype;
8041 DECL_DELETED_FN (decl) = 1;
8045 DECL_CONTEXT (decl) = ctype;
8047 check_class_member_definition_namespace (decl);
8050 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
8052 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8053 error ("cannot declare %<::main%> to be a template");
8055 error ("cannot declare %<::main%> to be inline");
8057 error ("cannot declare %<::main%> to be constexpr");
8059 error ("cannot declare %<::main%> to be static");
8064 /* Members of anonymous types and local classes have no linkage; make
8065 them internal. If a typedef is made later, this will be changed. */
8066 if (ctype && (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype))
8067 || decl_function_context (TYPE_MAIN_DECL (ctype))))
8070 if (publicp && cxx_dialect == cxx98)
8072 /* [basic.link]: A name with no linkage (notably, the name of a class
8073 or enumeration declared in a local scope) shall not be used to
8074 declare an entity with linkage.
8076 DR 757 relaxes this restriction for C++0x. */
8077 no_linkage_error (decl);
8080 TREE_PUBLIC (decl) = publicp;
8083 DECL_INTERFACE_KNOWN (decl) = 1;
8084 DECL_NOT_REALLY_EXTERN (decl) = 1;
8087 /* If the declaration was declared inline, mark it as such. */
8090 DECL_DECLARED_INLINE_P (decl) = 1;
8092 DECL_COMDAT (decl) = 1;
8095 DECL_DECLARED_CONSTEXPR_P (decl) = true;
8097 // If the concept declaration specifier was found, check
8098 // that the declaration satisfies the necessary requirements.
8101 DECL_DECLARED_CONCEPT_P (decl) = true;
8102 check_concept_fn (decl);
8105 DECL_EXTERNAL (decl) = 1;
8106 if (TREE_CODE (type) == FUNCTION_TYPE)
8109 TREE_TYPE (decl) = apply_memfn_quals (TREE_TYPE (decl),
8116 ? G_("static member function %qD cannot have cv-qualifier")
8117 : G_("non-member function %qD cannot have cv-qualifier"),
8119 quals = TYPE_UNQUALIFIED;
8125 ? G_("static member function %qD cannot have ref-qualifier")
8126 : G_("non-member function %qD cannot have ref-qualifier"),
8128 rqual = REF_QUAL_NONE;
8132 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
8133 && !grok_op_properties (decl, /*complain=*/true))
8135 else if (UDLIT_OPER_P (DECL_NAME (decl)))
8137 bool long_long_unsigned_p;
8139 const char *suffix = NULL;
8140 /* [over.literal]/6: Literal operators shall not have C linkage. */
8141 if (DECL_LANGUAGE (decl) == lang_c)
8143 error ("literal operator with C linkage");
8147 if (DECL_NAMESPACE_SCOPE_P (decl))
8149 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
8152 error ("%qD has invalid argument list", decl);
8156 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
8157 if (long_long_unsigned_p)
8159 if (cpp_interpret_int_suffix (parse_in, suffix, strlen (suffix)))
8160 warning (0, "integer suffix %<%s%>"
8161 " shadowed by implementation", suffix);
8163 else if (long_double_p)
8165 if (cpp_interpret_float_suffix (parse_in, suffix, strlen (suffix)))
8166 warning (0, "floating point suffix %<%s%>"
8167 " shadowed by implementation", suffix);
8172 error ("%qD must be a non-member function", decl);
8178 /* Make the init_value nonzero so pushdecl knows this is not
8179 tentative. error_mark_node is replaced later with the BLOCK. */
8180 DECL_INITIAL (decl) = error_mark_node;
8182 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
8183 TREE_NOTHROW (decl) = 1;
8185 if (flag_openmp || flag_openmp_simd || flag_cilkplus)
8187 /* Adjust "omp declare simd" attributes. */
8188 tree ods = lookup_attribute ("omp declare simd", *attrlist);
8192 for (attr = ods; attr;
8193 attr = lookup_attribute ("omp declare simd", TREE_CHAIN (attr)))
8195 if (TREE_CODE (type) == METHOD_TYPE)
8196 walk_tree (&TREE_VALUE (attr), declare_simd_adjust_this,
8197 DECL_ARGUMENTS (decl), NULL);
8198 if (TREE_VALUE (attr) != NULL_TREE)
8200 tree cl = TREE_VALUE (TREE_VALUE (attr));
8201 cl = c_omp_declare_simd_clauses_to_numbers
8202 (DECL_ARGUMENTS (decl), cl);
8204 TREE_VALUE (TREE_VALUE (attr)) = cl;
8206 TREE_VALUE (attr) = NULL_TREE;
8212 /* Caller will do the rest of this. */
8216 if (ctype != NULL_TREE)
8217 grokclassfn (ctype, decl, flags);
8220 if (cxx_dialect >= cxx11
8221 && DECL_DESTRUCTOR_P (decl)
8222 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))
8223 && !processing_template_decl)
8224 deduce_noexcept_on_destructor (decl);
8226 decl = check_explicit_specialization (orig_declarator, decl,
8229 4 * (friendp != 0) +
8231 if (decl == error_mark_node)
8234 if (DECL_STATIC_FUNCTION_P (decl))
8235 check_static_quals (decl, quals);
8239 cplus_decl_attributes (&decl, *attrlist, 0);
8240 *attrlist = NULL_TREE;
8243 /* Check main's type after attributes have been applied. */
8244 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
8246 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
8249 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
8251 error ("%<::main%> must return %<int%>");
8252 newtype = build_function_type (integer_type_node, oldtypeargs);
8253 TREE_TYPE (decl) = newtype;
8256 check_main_parameter_types (decl);
8259 if (ctype != NULL_TREE
8260 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
8263 tree old_decl = check_classfn (ctype, decl,
8264 (processing_template_decl
8265 > template_class_depth (ctype))
8266 ? current_template_parms
8269 if (old_decl == error_mark_node)
8277 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
8278 /* Because grokfndecl is always supposed to return a
8279 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8280 here. We depend on our callers to figure out that its
8281 really a template that's being returned. */
8282 old_decl = DECL_TEMPLATE_RESULT (old_decl);
8284 if (DECL_STATIC_FUNCTION_P (old_decl)
8285 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
8287 /* Remove the `this' parm added by grokclassfn. */
8288 revert_static_member_fn (decl);
8289 check_static_quals (decl, quals);
8291 if (DECL_ARTIFICIAL (old_decl))
8293 error ("definition of implicitly-declared %qD", old_decl);
8296 else if (DECL_DEFAULTED_FN (old_decl))
8298 error ("definition of explicitly-defaulted %q+D", decl);
8299 error ("%q+#D explicitly defaulted here", old_decl);
8303 /* Since we've smashed OLD_DECL to its
8304 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8305 if (TREE_CODE (decl) == TEMPLATE_DECL)
8306 decl = DECL_TEMPLATE_RESULT (decl);
8308 /* Attempt to merge the declarations. This can fail, in
8309 the case of some invalid specialization declarations. */
8310 pushed_scope = push_scope (ctype);
8311 ok = duplicate_decls (decl, old_decl, friendp);
8313 pop_scope (pushed_scope);
8316 error ("no %q#D member function declared in class %qT",
8320 if (ok == error_mark_node)
8326 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
8329 if (ctype == NULL_TREE || check)
8333 DECL_VIRTUAL_P (decl) = 1;
8338 /* decl is a FUNCTION_DECL.
8339 specifiers are the parsed virt-specifiers.
8341 Set flags to reflect the virt-specifiers.
8346 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
8348 if (decl == NULL_TREE)
8350 if (specifiers & VIRT_SPEC_OVERRIDE)
8351 DECL_OVERRIDE_P (decl) = 1;
8352 if (specifiers & VIRT_SPEC_FINAL)
8353 DECL_FINAL_P (decl) = 1;
8357 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8358 the linkage that DECL will receive in the object file. */
8361 set_linkage_for_static_data_member (tree decl)
8363 /* A static data member always has static storage duration and
8364 external linkage. Note that static data members are forbidden in
8365 local classes -- the only situation in which a class has
8366 non-external linkage. */
8367 TREE_PUBLIC (decl) = 1;
8368 TREE_STATIC (decl) = 1;
8369 /* For non-template classes, static data members are always put
8370 out in exactly those files where they are defined, just as
8371 with ordinary namespace-scope variables. */
8372 if (!processing_template_decl)
8373 DECL_INTERFACE_KNOWN (decl) = 1;
8376 /* Create a VAR_DECL named NAME with the indicated TYPE.
8378 If SCOPE is non-NULL, it is the class type or namespace containing
8379 the variable. If SCOPE is NULL, the variable should is created in
8380 the innermost enclosing scope. */
8383 grokvardecl (tree type,
8385 tree orig_declarator,
8386 const cp_decl_specifier_seq *declspecs,
8393 tree explicit_scope;
8395 gcc_assert (!name || identifier_p (name));
8397 bool constp = flags&1;
8398 bool conceptp = flags&2;
8400 /* Compute the scope in which to place the variable, but remember
8401 whether or not that scope was explicitly specified by the user. */
8402 explicit_scope = scope;
8405 /* An explicit "extern" specifier indicates a namespace-scope
8407 if (declspecs->storage_class == sc_extern)
8408 scope = current_decl_namespace ();
8409 else if (!at_function_scope_p ())
8410 scope = current_scope ();
8414 && (/* If the variable is a namespace-scope variable declared in a
8415 template, we need DECL_LANG_SPECIFIC. */
8416 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
8417 /* Similarly for namespace-scope variables with language linkage
8419 || (TREE_CODE (scope) == NAMESPACE_DECL
8420 && current_lang_name != lang_name_cplusplus)
8421 /* Similarly for static data members. */
8423 /* Similarly for explicit specializations. */
8425 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)))
8426 decl = build_lang_decl (VAR_DECL, name, type);
8428 decl = build_decl (input_location, VAR_DECL, name, type);
8430 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
8431 set_decl_namespace (decl, explicit_scope, 0);
8433 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
8435 if (declspecs->storage_class == sc_extern)
8437 DECL_THIS_EXTERN (decl) = 1;
8438 DECL_EXTERNAL (decl) = !initialized;
8441 if (DECL_CLASS_SCOPE_P (decl))
8443 set_linkage_for_static_data_member (decl);
8444 /* This function is only called with out-of-class definitions. */
8445 DECL_EXTERNAL (decl) = 0;
8446 check_class_member_definition_namespace (decl);
8448 /* At top level, either `static' or no s.c. makes a definition
8449 (perhaps tentative), and absence of `static' makes it public. */
8450 else if (toplevel_bindings_p ())
8452 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
8453 && (DECL_THIS_EXTERN (decl) || ! constp));
8454 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
8456 /* Not at top level, only `static' makes a static definition. */
8459 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
8460 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
8463 if (decl_spec_seq_has_spec_p (declspecs, ds_thread))
8465 if (DECL_EXTERNAL (decl) || TREE_STATIC (decl))
8467 CP_DECL_THREAD_LOCAL_P (decl) = true;
8468 if (!processing_template_decl)
8469 set_decl_tls_model (decl, decl_default_tls_model (decl));
8471 if (declspecs->gnu_thread_keyword_p)
8472 SET_DECL_GNU_TLS_P (decl);
8475 /* If the type of the decl has no linkage, make sure that we'll
8476 notice that in mark_used. */
8477 if (cxx_dialect > cxx98
8478 && decl_linkage (decl) != lk_none
8479 && DECL_LANG_SPECIFIC (decl) == NULL
8480 && !DECL_EXTERN_C_P (decl)
8481 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
8482 retrofit_lang_decl (decl);
8484 if (TREE_PUBLIC (decl))
8486 /* [basic.link]: A name with no linkage (notably, the name of a class
8487 or enumeration declared in a local scope) shall not be used to
8488 declare an entity with linkage.
8490 DR 757 relaxes this restriction for C++0x. */
8491 if (cxx_dialect < cxx11)
8492 no_linkage_error (decl);
8495 DECL_INTERFACE_KNOWN (decl) = 1;
8497 if (DECL_NAME (decl)
8498 && MAIN_NAME_P (DECL_NAME (decl))
8499 && scope == global_namespace)
8500 error ("cannot declare %<::main%> to be a global variable");
8502 /* Check that the variable can be safely declared as a concept.
8503 Note that this also forbids explicit specializations. */
8506 if (!processing_template_decl)
8508 error ("a non-template variable cannot be %<concept%>");
8512 DECL_DECLARED_CONCEPT_P (decl) = true;
8513 if (!same_type_ignoring_top_level_qualifiers_p (type, boolean_type_node))
8514 error_at (declspecs->locations[ds_type_spec],
8515 "concept must have type %<bool%>");
8517 else if (flag_concepts
8518 && processing_template_decl > template_class_depth (scope))
8520 tree reqs = TEMPLATE_PARMS_CONSTRAINTS (current_template_parms);
8521 tree ci = build_constraints (reqs, NULL_TREE);
8522 set_constraints (decl, ci);
8525 // Handle explicit specializations and instantiations of variable templates.
8526 if (orig_declarator)
8527 decl = check_explicit_specialization (orig_declarator, decl,
8528 template_count, conceptp * 8);
8530 return decl != error_mark_node ? decl : NULL_TREE;
8533 /* Create and return a canonical pointer to member function type, for
8534 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
8537 build_ptrmemfunc_type (tree type)
8542 if (type == error_mark_node)
8545 /* Make sure that we always have the unqualified pointer-to-member
8547 if (cp_cv_quals quals = cp_type_quals (type))
8549 tree unqual = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
8550 return cp_build_qualified_type (unqual, quals);
8553 /* If a canonical type already exists for this type, use it. We use
8554 this method instead of type_hash_canon, because it only does a
8555 simple equality check on the list of field members. */
8557 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
8560 t = make_node (RECORD_TYPE);
8562 /* Let the front end know this is a pointer to member function. */
8563 TYPE_PTRMEMFUNC_FLAG (t) = 1;
8565 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
8568 field = build_decl (input_location, FIELD_DECL, delta_identifier,
8570 DECL_CHAIN (field) = fields;
8573 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
8575 /* Zap out the name so that the back end will give us the debugging
8576 information for this anonymous RECORD_TYPE. */
8577 TYPE_NAME (t) = NULL_TREE;
8579 /* Cache this pointer-to-member type so that we can find it again
8581 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
8583 if (TYPE_STRUCTURAL_EQUALITY_P (type))
8584 SET_TYPE_STRUCTURAL_EQUALITY (t);
8585 else if (TYPE_CANONICAL (type) != type)
8586 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
8591 /* Create and return a pointer to data member type. */
8594 build_ptrmem_type (tree class_type, tree member_type)
8596 if (TREE_CODE (member_type) == METHOD_TYPE)
8598 cp_cv_quals quals = type_memfn_quals (member_type);
8599 cp_ref_qualifier rqual = type_memfn_rqual (member_type);
8600 member_type = build_memfn_type (member_type, class_type, quals, rqual);
8601 return build_ptrmemfunc_type (build_pointer_type (member_type));
8605 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
8606 return build_offset_type (class_type, member_type);
8610 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
8611 Check to see that the definition is valid. Issue appropriate error
8612 messages. Return 1 if the definition is particularly bad, or 0
8616 check_static_variable_definition (tree decl, tree type)
8618 /* Can't check yet if we don't know the type. */
8619 if (dependent_type_p (type))
8621 /* If DECL is declared constexpr, we'll do the appropriate checks
8622 in check_initializer. */
8623 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
8625 else if (cxx_dialect >= cxx11 && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
8627 if (!COMPLETE_TYPE_P (type))
8628 error ("in-class initialization of static data member %q#D of "
8629 "incomplete type", decl);
8630 else if (literal_type_p (type))
8631 permerror (input_location,
8632 "%<constexpr%> needed for in-class initialization of "
8633 "static data member %q#D of non-integral type", decl);
8635 error ("in-class initialization of static data member %q#D of "
8636 "non-literal type", decl);
8640 /* Motion 10 at San Diego: If a static const integral data member is
8641 initialized with an integral constant expression, the initializer
8642 may appear either in the declaration (within the class), or in
8643 the definition, but not both. If it appears in the class, the
8644 member is a member constant. The file-scope definition is always
8646 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
8648 error ("invalid in-class initialization of static data member "
8649 "of non-integral type %qT",
8653 else if (!CP_TYPE_CONST_P (type))
8654 error ("ISO C++ forbids in-class initialization of non-const "
8655 "static member %qD",
8657 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
8658 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids initialization of member constant "
8659 "%qD of non-integral type %qT", decl, type);
8664 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
8665 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
8666 expressions out into temporary variables so that walk_tree doesn't
8667 step into them (c++/15764). */
8670 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
8672 hash_set<tree> *pset = (hash_set<tree> *)data;
8673 tree expr = *expr_p;
8674 if (TREE_CODE (expr) == SAVE_EXPR)
8676 tree op = TREE_OPERAND (expr, 0);
8677 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
8678 if (TREE_SIDE_EFFECTS (op))
8679 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
8682 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
8687 /* Entry point for the above. */
8690 stabilize_vla_size (tree size)
8692 hash_set<tree> pset;
8693 /* Break out any function calls into temporary variables. */
8694 cp_walk_tree (&size, stabilize_save_expr_r, &pset, &pset);
8697 /* Reduce a SIZEOF_EXPR to its value. */
8700 fold_sizeof_expr (tree t)
8703 if (SIZEOF_EXPR_TYPE_P (t))
8704 r = cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t, 0)),
8705 SIZEOF_EXPR, false);
8706 else if (TYPE_P (TREE_OPERAND (t, 0)))
8707 r = cxx_sizeof_or_alignof_type (TREE_OPERAND (t, 0), SIZEOF_EXPR,
8710 r = cxx_sizeof_or_alignof_expr (TREE_OPERAND (t, 0), SIZEOF_EXPR,
8712 if (r == error_mark_node)
8717 /* Given the SIZE (i.e., number of elements) in an array, compute
8718 an appropriate index type for the array. If non-NULL, NAME is
8719 the name of the entity being declared. */
8722 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
8727 if (error_operand_p (size))
8728 return error_mark_node;
8730 if (!type_dependent_expression_p (size))
8732 tree type = TREE_TYPE (size);
8734 mark_rvalue_use (size);
8736 if (cxx_dialect < cxx11 && TREE_CODE (size) == NOP_EXPR
8737 && TREE_SIDE_EFFECTS (size))
8738 /* In C++98, we mark a non-constant array bound with a magic
8739 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
8742 size = instantiate_non_dependent_expr_sfinae (size, complain);
8744 if (CLASS_TYPE_P (type)
8745 && CLASSTYPE_LITERAL_P (type))
8747 size = build_expr_type_conversion (WANT_INT, size, true);
8750 if (!(complain & tf_error))
8751 return error_mark_node;
8753 error ("size of array %qD has non-integral type %qT",
8756 error ("size of array has non-integral type %qT", type);
8757 size = integer_one_node;
8759 if (size == error_mark_node)
8760 return error_mark_node;
8761 type = TREE_TYPE (size);
8764 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
8765 size = maybe_constant_value (size);
8767 if (!TREE_CONSTANT (size))
8771 if (error_operand_p (size))
8772 return error_mark_node;
8774 /* The array bound must be an integer type. */
8775 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
8777 if (!(complain & tf_error))
8778 return error_mark_node;
8780 error ("size of array %qD has non-integral type %qT", name, type);
8782 error ("size of array has non-integral type %qT", type);
8783 size = integer_one_node;
8784 type = TREE_TYPE (size);
8788 /* A type is dependent if it is...an array type constructed from any
8789 dependent type or whose size is specified by a constant expression
8790 that is value-dependent. */
8791 /* We can only call value_dependent_expression_p on integral constant
8792 expressions; treat non-constant expressions as dependent, too. */
8793 if (processing_template_decl
8794 && (type_dependent_expression_p (size)
8795 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
8797 /* We cannot do any checking for a SIZE that isn't known to be
8798 constant. Just build the index type and mark that it requires
8799 structural equality checks. */
8800 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
8801 size, size_one_node));
8802 TYPE_DEPENDENT_P (itype) = 1;
8803 TYPE_DEPENDENT_P_VALID (itype) = 1;
8804 SET_TYPE_STRUCTURAL_EQUALITY (itype);
8808 if (TREE_CODE (size) != INTEGER_CST)
8810 tree folded = cp_fully_fold (size);
8811 if (TREE_CODE (folded) == INTEGER_CST)
8812 pedwarn (location_of (size), OPT_Wpedantic,
8813 "size of array is not an integral constant-expression");
8814 /* Use the folded result for VLAs, too; it will have resolved
8819 /* Normally, the array-bound will be a constant. */
8820 if (TREE_CODE (size) == INTEGER_CST)
8822 /* Check to see if the array bound overflowed. Make that an
8823 error, no matter how generous we're being. */
8824 constant_expression_error (size);
8826 /* An array must have a positive number of elements. */
8827 if (tree_int_cst_lt (size, integer_zero_node))
8829 if (!(complain & tf_error))
8830 return error_mark_node;
8832 error ("size of array %qD is negative", name);
8834 error ("size of array is negative");
8835 size = integer_one_node;
8837 /* As an extension we allow zero-sized arrays. */
8838 else if (integer_zerop (size))
8840 if (!(complain & tf_error))
8841 /* We must fail if performing argument deduction (as
8842 indicated by the state of complain), so that
8843 another substitution can be found. */
8844 return error_mark_node;
8845 else if (in_system_header_at (input_location))
8846 /* Allow them in system headers because glibc uses them. */;
8848 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array %qD", name);
8850 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array");
8853 else if (TREE_CONSTANT (size)
8854 /* We don't allow VLAs at non-function scopes, or during
8855 tentative template substitution. */
8856 || !at_function_scope_p ()
8857 || !(complain & tf_error))
8859 if (!(complain & tf_error))
8860 return error_mark_node;
8861 /* `(int) &fn' is not a valid array bound. */
8863 error ("size of array %qD is not an integral constant-expression",
8866 error ("size of array is not an integral constant-expression");
8867 size = integer_one_node;
8869 else if (pedantic && warn_vla != 0)
8872 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8874 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8876 else if (warn_vla > 0)
8880 "variable length array %qD is used", name);
8883 "variable length array is used");
8886 if (processing_template_decl && !TREE_CONSTANT (size))
8887 /* A variable sized array. */
8888 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8891 HOST_WIDE_INT saved_processing_template_decl;
8893 /* Compute the index of the largest element in the array. It is
8894 one less than the number of elements in the array. We save
8895 and restore PROCESSING_TEMPLATE_DECL so that computations in
8896 cp_build_binary_op will be appropriately folded. */
8897 saved_processing_template_decl = processing_template_decl;
8898 processing_template_decl = 0;
8899 itype = cp_build_binary_op (input_location,
8901 cp_convert (ssizetype, size, complain),
8902 cp_convert (ssizetype, integer_one_node,
8905 itype = maybe_constant_value (itype);
8906 processing_template_decl = saved_processing_template_decl;
8908 if (!TREE_CONSTANT (itype))
8910 /* A variable sized array. */
8911 itype = variable_size (itype);
8913 stabilize_vla_size (itype);
8915 if (flag_sanitize & SANITIZE_VLA
8916 && do_ubsan_in_current_function ())
8918 /* We have to add 1 -- in the ubsan routine we generate
8919 LE_EXPR rather than LT_EXPR. */
8920 tree t = fold_build2 (PLUS_EXPR, TREE_TYPE (itype), itype,
8921 build_one_cst (TREE_TYPE (itype)));
8922 t = ubsan_instrument_vla (input_location, t);
8923 finish_expr_stmt (t);
8926 /* Make sure that there was no overflow when creating to a signed
8927 index type. (For example, on a 32-bit machine, an array with
8928 size 2^32 - 1 is too big.) */
8929 else if (TREE_CODE (itype) == INTEGER_CST
8930 && TREE_OVERFLOW (itype))
8932 if (!(complain & tf_error))
8933 return error_mark_node;
8934 error ("overflow in array dimension");
8935 TREE_OVERFLOW (itype) = 0;
8939 /* Create and return the appropriate index type. */
8940 itype = build_index_type (itype);
8942 /* If the index type were dependent, we would have returned early, so
8943 remember that it isn't. */
8944 TYPE_DEPENDENT_P (itype) = 0;
8945 TYPE_DEPENDENT_P_VALID (itype) = 1;
8949 /* Returns the scope (if any) in which the entity declared by
8950 DECLARATOR will be located. If the entity was declared with an
8951 unqualified name, NULL_TREE is returned. */
8954 get_scope_of_declarator (const cp_declarator *declarator)
8956 while (declarator && declarator->kind != cdk_id)
8957 declarator = declarator->declarator;
8959 /* If the declarator-id is a SCOPE_REF, the scope in which the
8960 declaration occurs is the first operand. */
8962 && declarator->u.id.qualifying_scope)
8963 return declarator->u.id.qualifying_scope;
8965 /* Otherwise, the declarator is not a qualified name; the entity will
8966 be declared in the current scope. */
8970 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8971 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8975 create_array_type_for_decl (tree name, tree type, tree size)
8977 tree itype = NULL_TREE;
8979 /* If things have already gone awry, bail now. */
8980 if (type == error_mark_node || size == error_mark_node)
8981 return error_mark_node;
8983 /* 8.3.4/1: If the type of the identifier of D contains the auto
8984 type-specifier, the program is ill-formed. */
8985 if (type_uses_auto (type))
8987 error ("%qD declared as array of %qT", name, type);
8988 return error_mark_node;
8991 /* If there are some types which cannot be array elements,
8992 issue an error-message and return. */
8993 switch (TREE_CODE (type))
8997 error ("declaration of %qD as array of void", name);
8999 error ("creating array of void");
9000 return error_mark_node;
9004 error ("declaration of %qD as array of functions", name);
9006 error ("creating array of functions");
9007 return error_mark_node;
9009 case REFERENCE_TYPE:
9011 error ("declaration of %qD as array of references", name);
9013 error ("creating array of references");
9014 return error_mark_node;
9018 error ("declaration of %qD as array of function members", name);
9020 error ("creating array of function members");
9021 return error_mark_node;
9029 The constant expressions that specify the bounds of the arrays
9030 can be omitted only for the first member of the sequence. */
9031 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
9034 error ("declaration of %qD as multidimensional array must "
9035 "have bounds for all dimensions except the first",
9038 error ("multidimensional array must have bounds for all "
9039 "dimensions except the first");
9041 return error_mark_node;
9044 /* Figure out the index type for the array. */
9046 itype = compute_array_index_type (name, size, tf_warning_or_error);
9049 T is called the array element type; this type shall not be [...] an
9050 abstract class type. */
9051 abstract_virtuals_error (name, type);
9053 return build_cplus_array_type (type, itype);
9056 /* Returns the smallest location != UNKNOWN_LOCATION among the
9057 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9058 and LOCATIONS[ds_restrict]. */
9061 smallest_type_quals_location (int type_quals, const location_t* locations)
9063 location_t loc = UNKNOWN_LOCATION;
9065 if (type_quals & TYPE_QUAL_CONST)
9066 loc = locations[ds_const];
9068 if ((type_quals & TYPE_QUAL_VOLATILE)
9069 && (loc == UNKNOWN_LOCATION || locations[ds_volatile] < loc))
9070 loc = locations[ds_volatile];
9072 if ((type_quals & TYPE_QUAL_RESTRICT)
9073 && (loc == UNKNOWN_LOCATION || locations[ds_restrict] < loc))
9074 loc = locations[ds_restrict];
9079 /* Check that it's OK to declare a function with the indicated TYPE
9080 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9081 that this function is. OPTYPE is the type given in a conversion
9082 operator declaration, or the class type for a constructor/destructor.
9083 Returns the actual return type of the function; that may be different
9084 than TYPE if an error occurs, or for certain special functions. */
9087 check_special_function_return_type (special_function_kind sfk,
9091 const location_t* locations)
9095 case sfk_constructor:
9097 error ("return type specification for constructor invalid");
9098 else if (type_quals != TYPE_UNQUALIFIED)
9099 error_at (smallest_type_quals_location (type_quals, locations),
9100 "qualifiers are not allowed on constructor declaration");
9102 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
9103 type = build_pointer_type (optype);
9105 type = void_type_node;
9108 case sfk_destructor:
9110 error ("return type specification for destructor invalid");
9111 else if (type_quals != TYPE_UNQUALIFIED)
9112 error_at (smallest_type_quals_location (type_quals, locations),
9113 "qualifiers are not allowed on destructor declaration");
9115 /* We can't use the proper return type here because we run into
9116 problems with ambiguous bases and covariant returns.
9117 Java classes are left unchanged because (void *) isn't a valid
9118 Java type, and we don't want to change the Java ABI. */
9119 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
9120 type = build_pointer_type (void_type_node);
9122 type = void_type_node;
9125 case sfk_conversion:
9127 error ("return type specified for %<operator %T%>", optype);
9128 else if (type_quals != TYPE_UNQUALIFIED)
9129 error_at (smallest_type_quals_location (type_quals, locations),
9130 "qualifiers are not allowed on declaration of "
9131 "%<operator %T%>", optype);
9143 /* A variable or data member (whose unqualified name is IDENTIFIER)
9144 has been declared with the indicated TYPE. If the TYPE is not
9145 acceptable, issue an error message and return a type to use for
9146 error-recovery purposes. */
9149 check_var_type (tree identifier, tree type)
9151 if (VOID_TYPE_P (type))
9154 error ("unnamed variable or field declared void");
9155 else if (identifier_p (identifier))
9157 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
9158 error ("variable or field %qE declared void", identifier);
9161 error ("variable or field declared void");
9162 type = error_mark_node;
9168 /* Given declspecs and a declarator (abstract or otherwise), determine
9169 the name and type of the object declared and construct a DECL node
9172 DECLSPECS points to the representation of declaration-specifier
9173 sequence that precedes declarator.
9175 DECL_CONTEXT says which syntactic context this declaration is in:
9176 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9177 FUNCDEF for a function definition. Like NORMAL but a few different
9178 error messages in each case. Return value may be zero meaning
9179 this definition is too screwy to try to parse.
9180 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9181 handle member functions (which have FIELD context).
9182 Return value may be zero meaning this definition is too screwy to
9184 PARM for a parameter declaration (either within a function prototype
9185 or before a function body). Make a PARM_DECL, or return void_type_node.
9186 TPARM for a template parameter declaration.
9187 CATCHPARM for a parameter declaration before a catch clause.
9188 TYPENAME if for a typename (in a cast or sizeof).
9189 Don't make a DECL node; just return the ..._TYPE node.
9190 FIELD for a struct or union field; make a FIELD_DECL.
9191 BITFIELD for a field with specified width.
9193 INITIALIZED is as for start_decl.
9195 ATTRLIST is a pointer to the list of attributes, which may be NULL
9196 if there are none; *ATTRLIST may be modified if attributes from inside
9197 the declarator should be applied to the declaration.
9199 When this function is called, scoping variables (such as
9200 CURRENT_CLASS_TYPE) should reflect the scope in which the
9201 declaration occurs, not the scope in which the new declaration will
9202 be placed. For example, on:
9206 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9209 Returns a DECL (if a declarator is present), a TYPE (if there is no
9210 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9214 grokdeclarator (const cp_declarator *declarator,
9215 cp_decl_specifier_seq *declspecs,
9216 enum decl_context decl_context,
9220 tree type = NULL_TREE;
9222 int explicit_intN = 0;
9223 int virtualp, explicitp, friendp, inlinep, staticp;
9224 int explicit_int = 0;
9225 int explicit_char = 0;
9226 int defaulted_int = 0;
9228 tree typedef_decl = NULL_TREE;
9229 const char *name = NULL;
9230 tree typedef_type = NULL_TREE;
9231 /* True if this declarator is a function definition. */
9232 bool funcdef_flag = false;
9233 cp_declarator_kind innermost_code = cdk_error;
9236 /* See the code below that used this. */
9237 tree decl_attr = NULL_TREE;
9240 /* Keep track of what sort of function is being processed
9241 so that we can warn about default return values, or explicit
9242 return values which do not match prescribed defaults. */
9243 special_function_kind sfk = sfk_none;
9245 tree dname = NULL_TREE;
9246 tree ctor_return_type = NULL_TREE;
9247 enum overload_flags flags = NO_SPECIAL;
9248 /* cv-qualifiers that apply to the declarator, for a declaration of
9249 a member function. */
9250 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
9251 /* virt-specifiers that apply to the declarator, for a declaration of
9252 a member function. */
9253 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
9254 /* ref-qualifier that applies to the declarator, for a declaration of
9255 a member function. */
9256 cp_ref_qualifier rqual = REF_QUAL_NONE;
9257 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
9258 int type_quals = TYPE_UNQUALIFIED;
9259 tree raises = NULL_TREE;
9260 int template_count = 0;
9261 tree returned_attrs = NULL_TREE;
9262 tree parms = NULL_TREE;
9263 const cp_declarator *id_declarator;
9264 /* The unqualified name of the declarator; either an
9265 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
9266 tree unqualified_id;
9267 /* The class type, if any, in which this entity is located,
9268 or NULL_TREE if none. Note that this value may be different from
9269 the current class type; for example if an attempt is made to declare
9270 "A::f" inside "B", this value will be "A". */
9271 tree ctype = current_class_type;
9272 /* The NAMESPACE_DECL for the namespace in which this entity is
9273 located. If an unqualified name is used to declare the entity,
9274 this value will be NULL_TREE, even if the entity is located at
9276 tree in_namespace = NULL_TREE;
9277 cp_storage_class storage_class;
9278 bool unsigned_p, signed_p, short_p, long_p, thread_p;
9279 bool type_was_error_mark_node = false;
9280 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
9281 bool template_type_arg = false;
9282 bool template_parm_flag = false;
9283 bool typedef_p = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
9284 bool constexpr_p = decl_spec_seq_has_spec_p (declspecs, ds_constexpr);
9285 bool late_return_type_p = false;
9286 bool array_parameter_p = false;
9287 source_location saved_loc = input_location;
9289 tree reqs = NULL_TREE;
9291 signed_p = decl_spec_seq_has_spec_p (declspecs, ds_signed);
9292 unsigned_p = decl_spec_seq_has_spec_p (declspecs, ds_unsigned);
9293 short_p = decl_spec_seq_has_spec_p (declspecs, ds_short);
9294 long_p = decl_spec_seq_has_spec_p (declspecs, ds_long);
9295 longlong = decl_spec_seq_has_spec_p (declspecs, ds_long_long);
9296 explicit_intN = declspecs->explicit_intN_p;
9297 thread_p = decl_spec_seq_has_spec_p (declspecs, ds_thread);
9299 // Was concept_p specified? Note that ds_concept
9300 // implies ds_constexpr!
9301 bool concept_p = decl_spec_seq_has_spec_p (declspecs, ds_concept);
9305 if (decl_spec_seq_has_spec_p (declspecs, ds_const))
9306 type_quals |= TYPE_QUAL_CONST;
9307 if (decl_spec_seq_has_spec_p (declspecs, ds_volatile))
9308 type_quals |= TYPE_QUAL_VOLATILE;
9309 if (decl_spec_seq_has_spec_p (declspecs, ds_restrict))
9310 type_quals |= TYPE_QUAL_RESTRICT;
9312 if (decl_context == FUNCDEF)
9313 funcdef_flag = true, decl_context = NORMAL;
9314 else if (decl_context == MEMFUNCDEF)
9315 funcdef_flag = true, decl_context = FIELD;
9316 else if (decl_context == BITFIELD)
9317 bitfield = 1, decl_context = FIELD;
9318 else if (decl_context == TEMPLATE_TYPE_ARG)
9319 template_type_arg = true, decl_context = TYPENAME;
9320 else if (decl_context == TPARM)
9321 template_parm_flag = true, decl_context = PARM;
9323 if (initialized > 1)
9324 funcdef_flag = true;
9326 /* Look inside a declarator for the name being declared
9327 and get it as a string, for an error message. */
9328 for (id_declarator = declarator;
9330 id_declarator = id_declarator->declarator)
9332 if (id_declarator->kind != cdk_id)
9333 innermost_code = id_declarator->kind;
9335 switch (id_declarator->kind)
9338 if (id_declarator->declarator
9339 && id_declarator->declarator->kind == cdk_id)
9341 sfk = id_declarator->declarator->u.id.sfk;
9342 if (sfk == sfk_destructor)
9349 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
9350 tree decl = id_declarator->u.id.unqualified_name;
9353 if (qualifying_scope)
9355 if (at_function_scope_p ())
9359 A declarator-id shall not be qualified except
9362 None of the cases are permitted in block
9364 if (qualifying_scope == global_namespace)
9365 error ("invalid use of qualified-name %<::%D%>",
9367 else if (TYPE_P (qualifying_scope))
9368 error ("invalid use of qualified-name %<%T::%D%>",
9369 qualifying_scope, decl);
9371 error ("invalid use of qualified-name %<%D::%D%>",
9372 qualifying_scope, decl);
9373 return error_mark_node;
9375 else if (TYPE_P (qualifying_scope))
9377 ctype = qualifying_scope;
9378 if (!MAYBE_CLASS_TYPE_P (ctype))
9380 error ("%q#T is not a class or a namespace", ctype);
9383 else if (innermost_code != cdk_function
9384 && current_class_type
9385 && !uniquely_derived_from_p (ctype,
9386 current_class_type))
9388 error ("invalid use of qualified-name %<%T::%D%>",
9389 qualifying_scope, decl);
9390 return error_mark_node;
9393 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
9394 in_namespace = qualifying_scope;
9396 switch (TREE_CODE (decl))
9402 if (innermost_code != cdk_function)
9404 error ("declaration of %qD as non-function", decl);
9405 return error_mark_node;
9407 else if (!qualifying_scope
9408 && !(current_class_type && at_class_scope_p ()))
9410 error ("declaration of %qD as non-member", decl);
9411 return error_mark_node;
9414 type = TREE_OPERAND (decl, 0);
9416 type = constructor_name (type);
9417 name = identifier_to_locale (IDENTIFIER_POINTER (type));
9422 case TEMPLATE_ID_EXPR:
9424 tree fns = TREE_OPERAND (decl, 0);
9427 if (!identifier_p (dname))
9429 if (variable_template_p (dname))
9430 dname = DECL_NAME (dname);
9433 gcc_assert (is_overloaded_fn (dname));
9434 dname = DECL_NAME (get_first_fn (dname));
9440 case IDENTIFIER_NODE:
9441 if (identifier_p (decl))
9444 if (C_IS_RESERVED_WORD (dname))
9446 error ("declarator-id missing; using reserved word %qD",
9448 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9450 else if (!IDENTIFIER_TYPENAME_P (dname))
9451 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9454 gcc_assert (flags == NO_SPECIAL);
9455 flags = TYPENAME_FLAG;
9456 ctor_return_type = TREE_TYPE (dname);
9457 sfk = sfk_conversion;
9458 if (is_typename_at_global_scope (dname))
9459 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9461 name = "<invalid operator>";
9478 return error_mark_node;
9483 if (id_declarator->kind == cdk_id)
9489 The declarator in a function-definition shall have the form
9490 D1 ( parameter-declaration-clause) ... */
9491 if (funcdef_flag && innermost_code != cdk_function)
9493 error ("function definition does not declare parameters");
9494 return error_mark_node;
9497 if (flags == TYPENAME_FLAG
9498 && innermost_code != cdk_function
9499 && ! (ctype && !declspecs->any_specifiers_p))
9501 error ("declaration of %qD as non-function", dname);
9502 return error_mark_node;
9506 && identifier_p (dname)
9507 && UDLIT_OPER_P (dname)
9508 && innermost_code != cdk_function)
9510 error ("declaration of %qD as non-function", dname);
9511 return error_mark_node;
9514 if (dname && IDENTIFIER_OPNAME_P (dname))
9518 error ("declaration of %qD as %<typedef%>", dname);
9519 return error_mark_node;
9521 else if (decl_context == PARM || decl_context == CATCHPARM)
9523 error ("declaration of %qD as parameter", dname);
9524 return error_mark_node;
9528 /* Anything declared one level down from the top level
9529 must be one of the parameters of a function
9530 (because the body is at least two levels down). */
9532 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
9533 by not allowing C++ class definitions to specify their parameters
9534 with xdecls (must be spec.d in the parmlist).
9536 Since we now wait to push a class scope until we are sure that
9537 we are in a legitimate method context, we must set oldcname
9538 explicitly (since current_class_name is not yet alive).
9540 We also want to avoid calling this a PARM if it is in a namespace. */
9542 if (decl_context == NORMAL && !toplevel_bindings_p ())
9544 cp_binding_level *b = current_binding_level;
9545 current_binding_level = b->level_chain;
9546 if (current_binding_level != 0 && toplevel_bindings_p ())
9547 decl_context = PARM;
9548 current_binding_level = b;
9552 name = decl_context == PARM ? "parameter" : "type name";
9554 if (concept_p && typedef_p)
9556 error ("%<concept%> cannot appear in a typedef declaration");
9557 return error_mark_node;
9560 if (constexpr_p && typedef_p)
9562 error ("%<constexpr%> cannot appear in a typedef declaration");
9563 return error_mark_node;
9566 /* If there were multiple types specified in the decl-specifier-seq,
9567 issue an error message. */
9568 if (declspecs->multiple_types_p)
9570 error ("two or more data types in declaration of %qs", name);
9571 return error_mark_node;
9574 if (declspecs->conflicting_specifiers_p)
9576 error ("conflicting specifiers in declaration of %qs", name);
9577 return error_mark_node;
9580 /* Extract the basic type from the decl-specifier-seq. */
9581 type = declspecs->type;
9582 if (type == error_mark_node)
9585 type_was_error_mark_node = true;
9587 /* If the entire declaration is itself tagged as deprecated then
9588 suppress reports of deprecated items. */
9589 if (type && TREE_DEPRECATED (type)
9590 && deprecated_state != DEPRECATED_SUPPRESS)
9591 warn_deprecated_use (type, NULL_TREE);
9592 if (type && TREE_CODE (type) == TYPE_DECL)
9594 typedef_decl = type;
9595 type = TREE_TYPE (typedef_decl);
9596 if (TREE_DEPRECATED (type)
9597 && DECL_ARTIFICIAL (typedef_decl)
9598 && deprecated_state != DEPRECATED_SUPPRESS)
9599 warn_deprecated_use (type, NULL_TREE);
9601 /* No type at all: default to `int', and set DEFAULTED_INT
9602 because it was not a user-defined typedef. */
9603 if (type == NULL_TREE)
9605 if (signed_p || unsigned_p || long_p || short_p)
9607 /* These imply 'int'. */
9608 type = integer_type_node;
9611 /* If we just have "complex", it is equivalent to "complex double". */
9612 else if (!longlong && !explicit_intN
9613 && decl_spec_seq_has_spec_p (declspecs, ds_complex))
9615 type = double_type_node;
9616 pedwarn (declspecs->locations[ds_complex], OPT_Wpedantic,
9617 "ISO C++ does not support plain %<complex%> meaning "
9618 "%<double complex%>");
9622 explicit_int = declspecs->explicit_int_p;
9623 explicit_char = declspecs->explicit_char_p;
9626 /* See the code below that used this. */
9628 decl_attr = DECL_ATTRIBUTES (typedef_decl);
9630 typedef_type = type;
9633 if (sfk != sfk_conversion)
9634 ctor_return_type = ctype;
9636 if (sfk != sfk_none)
9638 type = check_special_function_return_type (sfk, type,
9641 declspecs->locations);
9642 type_quals = TYPE_UNQUALIFIED;
9644 else if (type == NULL_TREE)
9650 /* We handle `main' specially here, because 'main () { }' is so
9651 common. With no options, it is allowed. With -Wreturn-type,
9652 it is a warning. It is only an error with -pedantic-errors. */
9653 is_main = (funcdef_flag
9654 && dname && identifier_p (dname)
9655 && MAIN_NAME_P (dname)
9656 && ctype == NULL_TREE
9657 && in_namespace == NULL_TREE
9658 && current_namespace == global_namespace);
9660 if (type_was_error_mark_node)
9661 /* We've already issued an error, don't complain more. */;
9662 else if (in_system_header_at (input_location) || flag_ms_extensions)
9663 /* Allow it, sigh. */;
9665 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
9667 pedwarn (input_location, OPT_Wpedantic,
9668 "ISO C++ forbids declaration of %qs with no type", name);
9670 warning (OPT_Wreturn_type,
9671 "ISO C++ forbids declaration of %qs with no type", name);
9673 if (type_was_error_mark_node && template_parm_flag)
9674 /* FIXME we should be able to propagate the error_mark_node as is
9675 for other contexts too. */
9676 type = error_mark_node;
9678 type = integer_type_node;
9685 if (! int_n_enabled_p[declspecs->int_n_idx])
9687 error ("%<__int%d%> is not supported by this target",
9688 int_n_data[declspecs->int_n_idx].bitsize);
9689 explicit_intN = false;
9691 else if (pedantic && ! in_system_header_at (input_location))
9692 pedwarn (input_location, OPT_Wpedantic,
9693 "ISO C++ does not support %<__int%d%> for %qs",
9694 int_n_data[declspecs->int_n_idx].bitsize, name);
9697 /* Now process the modifiers that were specified
9698 and check for invalid combinations. */
9700 /* Long double is a special combination. */
9701 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
9704 type = cp_build_qualified_type (long_double_type_node,
9705 cp_type_quals (type));
9708 /* Check all other uses of type modifiers. */
9710 if (unsigned_p || signed_p || long_p || short_p)
9714 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
9715 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
9716 else if (signed_p && unsigned_p)
9717 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
9718 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
9719 error ("%<long long%> invalid for %qs", name);
9720 else if (long_p && TREE_CODE (type) == REAL_TYPE)
9721 error ("%<long%> invalid for %qs", name);
9722 else if (short_p && TREE_CODE (type) == REAL_TYPE)
9723 error ("%<short%> invalid for %qs", name);
9724 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
9725 error ("%<long%> or %<short%> invalid for %qs", name);
9726 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_intN)
9727 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
9728 else if ((long_p || short_p) && explicit_char)
9729 error ("%<long%> or %<short%> specified with char for %qs", name);
9730 else if (long_p && short_p)
9731 error ("%<long%> and %<short%> specified together for %qs", name);
9732 else if (type == char16_type_node || type == char32_type_node)
9734 if (signed_p || unsigned_p)
9735 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
9736 else if (short_p || long_p)
9737 error ("%<short%> or %<long%> invalid for %qs", name);
9742 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_intN && pedantic)
9744 pedwarn (input_location, OPT_Wpedantic,
9745 "long, short, signed or unsigned used invalidly for %qs",
9747 if (flag_pedantic_errors)
9752 /* Discard the type modifiers if they are invalid. */
9763 /* Decide whether an integer type is signed or not.
9764 Optionally treat bitfields as signed by default. */
9768 It is implementation-defined whether a plain (neither
9769 explicitly signed or unsigned) char, short, int, or long
9770 bit-field is signed or unsigned.
9772 Naturally, we extend this to long long as well. Note that
9773 this does not include wchar_t. */
9774 || (bitfield && !flag_signed_bitfields
9776 /* A typedef for plain `int' without `signed' can be
9777 controlled just like plain `int', but a typedef for
9778 `signed int' cannot be so controlled. */
9780 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
9781 && TREE_CODE (type) == INTEGER_TYPE
9782 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
9785 type = int_n_trees[declspecs->int_n_idx].unsigned_type;
9787 type = long_long_unsigned_type_node;
9789 type = long_unsigned_type_node;
9791 type = short_unsigned_type_node;
9792 else if (type == char_type_node)
9793 type = unsigned_char_type_node;
9794 else if (typedef_decl)
9795 type = unsigned_type_for (type);
9797 type = unsigned_type_node;
9799 else if (signed_p && type == char_type_node)
9800 type = signed_char_type_node;
9801 else if (explicit_intN)
9802 type = int_n_trees[declspecs->int_n_idx].signed_type;
9804 type = long_long_integer_type_node;
9806 type = long_integer_type_node;
9808 type = short_integer_type_node;
9810 if (decl_spec_seq_has_spec_p (declspecs, ds_complex))
9812 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
9813 error ("complex invalid for %qs", name);
9814 /* If a modifier is specified, the resulting complex is the complex
9815 form of TYPE. E.g, "complex short" is "complex short int". */
9816 else if (type == integer_type_node)
9817 type = complex_integer_type_node;
9818 else if (type == float_type_node)
9819 type = complex_float_type_node;
9820 else if (type == double_type_node)
9821 type = complex_double_type_node;
9822 else if (type == long_double_type_node)
9823 type = complex_long_double_type_node;
9825 type = build_complex_type (type);
9828 /* If we're using the injected-class-name to form a compound type or a
9829 declaration, replace it with the underlying class so we don't get
9830 redundant typedefs in the debug output. But if we are returning the
9831 type unchanged, leave it alone so that it's available to
9832 maybe_get_template_decl_from_type_decl. */
9833 if (CLASS_TYPE_P (type)
9834 && DECL_SELF_REFERENCE_P (TYPE_NAME (type))
9835 && type == TREE_TYPE (TYPE_NAME (type))
9836 && (declarator || type_quals))
9837 type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));
9839 type_quals |= cp_type_quals (type);
9840 type = cp_build_qualified_type_real
9841 (type, type_quals, ((((typedef_decl && !DECL_ARTIFICIAL (typedef_decl))
9842 || declspecs->decltype_p)
9843 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
9844 /* We might have ignored or rejected some of the qualifiers. */
9845 type_quals = cp_type_quals (type);
9848 inlinep = decl_spec_seq_has_spec_p (declspecs, ds_inline);
9849 virtualp = decl_spec_seq_has_spec_p (declspecs, ds_virtual);
9850 explicitp = decl_spec_seq_has_spec_p (declspecs, ds_explicit);
9852 storage_class = declspecs->storage_class;
9853 if (storage_class == sc_static)
9854 staticp = 1 + (decl_context == FIELD);
9860 error ("member %qD cannot be declared both %<virtual%> "
9861 "and %<static%>", dname);
9862 storage_class = sc_none;
9866 error ("member %qD cannot be declared both %<virtual%> "
9867 "and %<constexpr%>", dname);
9869 friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend);
9871 /* Issue errors about use of storage classes for parameters. */
9872 if (decl_context == PARM)
9876 error ("typedef declaration invalid in parameter declaration");
9877 return error_mark_node;
9879 else if (template_parm_flag && storage_class != sc_none)
9881 error ("storage class specified for template parameter %qs", name);
9882 return error_mark_node;
9884 else if (storage_class == sc_static
9885 || storage_class == sc_extern
9887 error ("storage class specifiers invalid in parameter declarations");
9889 /* Function parameters cannot be concept. */
9891 error ("a parameter cannot be declared %<concept%>");
9892 /* Function parameters cannot be constexpr. If we saw one, moan
9893 and pretend it wasn't there. */
9894 else if (constexpr_p)
9896 error ("a parameter cannot be declared %<constexpr%>");
9901 /* Give error if `virtual' is used outside of class declaration. */
9903 && (current_class_name == NULL_TREE || decl_context != FIELD))
9905 error_at (declspecs->locations[ds_virtual],
9906 "%<virtual%> outside class declaration");
9910 /* Static anonymous unions are dealt with here. */
9911 if (staticp && decl_context == TYPENAME
9913 && ANON_AGGR_TYPE_P (declspecs->type))
9914 decl_context = FIELD;
9916 /* Warn about storage classes that are invalid for certain
9917 kinds of declarations (parameters, typenames, etc.). */
9920 && storage_class != sc_extern
9921 && storage_class != sc_static)
9924 error ("multiple storage classes in declaration of %qs", name);
9927 if (decl_context != NORMAL
9928 && ((storage_class != sc_none
9929 && storage_class != sc_mutable)
9932 if ((decl_context == PARM || decl_context == CATCHPARM)
9933 && (storage_class == sc_register
9934 || storage_class == sc_auto))
9938 else if (decl_context == FIELD
9939 /* C++ allows static class elements. */
9940 && storage_class == sc_static)
9941 /* C++ also allows inlines and signed and unsigned elements,
9942 but in those cases we don't come in here. */
9946 if (decl_context == FIELD)
9947 error ("storage class specified for %qs", name);
9950 if (decl_context == PARM || decl_context == CATCHPARM)
9951 error ("storage class specified for parameter %qs", name);
9953 error ("storage class specified for typename");
9955 if (storage_class == sc_register
9956 || storage_class == sc_auto
9957 || storage_class == sc_extern
9959 storage_class = sc_none;
9962 else if (storage_class == sc_extern && funcdef_flag
9963 && ! toplevel_bindings_p ())
9964 error ("nested function %qs declared %<extern%>", name);
9965 else if (toplevel_bindings_p ())
9967 if (storage_class == sc_auto)
9968 error ("top-level declaration of %qs specifies %<auto%>", name);
9971 && storage_class != sc_extern
9972 && storage_class != sc_static)
9974 if (declspecs->gnu_thread_keyword_p)
9975 pedwarn (input_location, 0, "function-scope %qs implicitly auto and "
9976 "declared %<__thread%>", name);
9978 /* When thread_local is applied to a variable of block scope the
9979 storage-class-specifier static is implied if it does not appear
9981 storage_class = declspecs->storage_class = sc_static;
9985 if (storage_class && friendp)
9987 error ("storage class specifiers invalid in friend function declarations");
9988 storage_class = sc_none;
9993 unqualified_id = NULL_TREE;
9996 unqualified_id = id_declarator->u.id.unqualified_name;
9997 switch (TREE_CODE (unqualified_id))
10000 unqualified_id = TREE_OPERAND (unqualified_id, 0);
10001 if (TYPE_P (unqualified_id))
10002 unqualified_id = constructor_name (unqualified_id);
10005 case IDENTIFIER_NODE:
10006 case TEMPLATE_ID_EXPR:
10010 gcc_unreachable ();
10014 if (declspecs->std_attributes)
10016 /* Apply the c++11 attributes to the type preceding them. */
10017 input_location = declspecs->locations[ds_std_attribute];
10018 decl_attributes (&type, declspecs->std_attributes, 0);
10019 input_location = saved_loc;
10022 /* Determine the type of the entity declared by recurring on the
10024 for (; declarator; declarator = declarator->declarator)
10026 const cp_declarator *inner_declarator;
10029 if (type == error_mark_node)
10030 return error_mark_node;
10032 attrs = declarator->attributes;
10038 if (declarator == NULL || declarator->kind == cdk_id)
10039 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
10040 if (declarator->kind == cdk_function)
10041 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
10042 if (declarator->kind == cdk_array)
10043 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
10044 returned_attrs = decl_attributes (&type,
10045 chainon (returned_attrs, attrs),
10049 if (declarator->kind == cdk_id)
10052 inner_declarator = declarator->declarator;
10054 switch (declarator->kind)
10057 type = create_array_type_for_decl (dname, type,
10058 declarator->u.array.bounds);
10059 if (!valid_array_size_p (input_location, type, dname))
10060 type = error_mark_node;
10062 if (declarator->std_attributes)
10065 The optional attribute-specifier-seq appertains to the
10067 returned_attrs = chainon (returned_attrs,
10068 declarator->std_attributes);
10076 /* Declaring a function type.
10077 Make sure we have a valid type for the function to return. */
10079 if (type_quals != TYPE_UNQUALIFIED)
10081 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
10082 warning (OPT_Wignored_qualifiers,
10083 "type qualifiers ignored on function return type");
10084 /* We now know that the TYPE_QUALS don't apply to the
10085 decl, but to its return type. */
10086 type_quals = TYPE_UNQUALIFIED;
10088 errmsg = targetm.invalid_return_type (type);
10092 type = integer_type_node;
10095 /* Error about some types functions can't return. */
10097 if (TREE_CODE (type) == FUNCTION_TYPE)
10099 error ("%qs declared as function returning a function", name);
10100 return error_mark_node;
10102 if (TREE_CODE (type) == ARRAY_TYPE)
10104 error ("%qs declared as function returning an array", name);
10105 return error_mark_node;
10108 input_location = declspecs->locations[ds_type_spec];
10109 abstract_virtuals_error (ACU_RETURN, type);
10110 input_location = saved_loc;
10112 /* Pick up type qualifiers which should be applied to `this'. */
10113 memfn_quals = declarator->u.function.qualifiers;
10114 /* Pick up virt-specifiers. */
10115 virt_specifiers = declarator->u.function.virt_specifiers;
10116 /* And ref-qualifier, too */
10117 rqual = declarator->u.function.ref_qualifier;
10118 /* And tx-qualifier. */
10119 tree tx_qual = declarator->u.function.tx_qualifier;
10120 /* Pick up the exception specifications. */
10121 raises = declarator->u.function.exception_specification;
10122 /* If the exception-specification is ill-formed, let's pretend
10123 there wasn't one. */
10124 if (raises == error_mark_node)
10125 raises = NULL_TREE;
10128 error_at (location_of (reqs), "requires-clause on return type");
10129 reqs = declarator->u.function.requires_clause;
10131 /* Say it's a definition only for the CALL_EXPR
10132 closest to the identifier. */
10133 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
10135 /* Handle a late-specified return type. */
10138 if (type_uses_auto (type))
10140 if (!declarator->u.function.late_return_type)
10142 if (current_class_type
10143 && LAMBDA_TYPE_P (current_class_type))
10144 /* OK for C++11 lambdas. */;
10145 else if (cxx_dialect < cxx14)
10147 error ("%qs function uses "
10148 "%<auto%> type specifier without trailing "
10149 "return type", name);
10150 inform (input_location, "deduced return type "
10151 "only available with -std=c++14 or "
10156 error ("virtual function cannot "
10157 "have deduced return type");
10161 else if (!is_auto (type) && sfk != sfk_conversion)
10163 error ("%qs function with trailing return type has"
10164 " %qT as its type rather than plain %<auto%>",
10166 return error_mark_node;
10169 else if (declarator->u.function.late_return_type
10170 && sfk != sfk_conversion)
10172 if (cxx_dialect < cxx11)
10173 /* Not using maybe_warn_cpp0x because this should
10174 always be an error. */
10175 error ("trailing return type only available with "
10176 "-std=c++11 or -std=gnu++11");
10178 error ("%qs function with trailing return type not "
10179 "declared with %<auto%> type specifier", name);
10180 return error_mark_node;
10183 type = splice_late_return_type
10184 (type, declarator->u.function.late_return_type);
10185 if (type == error_mark_node)
10186 return error_mark_node;
10188 if (declarator->u.function.late_return_type)
10189 late_return_type_p = true;
10191 if (ctype == NULL_TREE
10192 && decl_context == FIELD
10195 ctype = current_class_type;
10197 if (ctype && (sfk == sfk_constructor
10198 || sfk == sfk_destructor))
10200 /* We are within a class's scope. If our declarator name
10201 is the same as the class name, and we are defining
10202 a function, then it is a constructor/destructor, and
10203 therefore returns a void type. */
10205 /* ISO C++ 12.4/2. A destructor may not be declared
10206 const or volatile. A destructor may not be static.
10207 A destructor may not be declared with ref-qualifier.
10209 ISO C++ 12.1. A constructor may not be declared
10210 const or volatile. A constructor may not be
10211 virtual. A constructor may not be static.
10212 A constructor may not be declared with ref-qualifier. */
10214 error ((flags == DTOR_FLAG)
10215 ? G_("destructor cannot be static member function")
10216 : G_("constructor cannot be static member function"));
10219 error ((flags == DTOR_FLAG)
10220 ? G_("destructors may not be cv-qualified")
10221 : G_("constructors may not be cv-qualified"));
10222 memfn_quals = TYPE_UNQUALIFIED;
10227 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER);
10228 error ((flags == DTOR_FLAG)
10229 ? "destructors may not be ref-qualified"
10230 : "constructors may not be ref-qualified");
10231 rqual = REF_QUAL_NONE;
10234 if (decl_context == FIELD
10235 && !member_function_or_else (ctype,
10236 current_class_type,
10238 return error_mark_node;
10240 if (flags != DTOR_FLAG)
10242 /* It's a constructor. */
10243 if (explicitp == 1)
10247 permerror (input_location,
10248 "constructors cannot be declared %<virtual%>");
10251 if (decl_context == FIELD
10252 && sfk != sfk_constructor)
10253 return error_mark_node;
10255 if (decl_context == FIELD)
10262 /* Cannot be both friend and virtual. */
10263 error ("virtual functions cannot be friends");
10266 if (decl_context == NORMAL)
10267 error ("friend declaration not in class definition");
10268 if (current_function_decl && funcdef_flag)
10269 error ("can%'t define friend function %qs in a local "
10270 "class definition",
10273 else if (ctype && sfk == sfk_conversion)
10275 if (explicitp == 1)
10277 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
10280 if (late_return_type_p)
10281 error ("a conversion function cannot have a trailing return type");
10284 arg_types = grokparms (declarator->u.function.parameters,
10287 if (inner_declarator
10288 && inner_declarator->kind == cdk_id
10289 && inner_declarator->u.id.sfk == sfk_destructor
10290 && arg_types != void_list_node)
10292 error ("destructors may not have parameters");
10293 arg_types = void_list_node;
10297 type = build_function_type (type, arg_types);
10299 tree attrs = declarator->std_attributes;
10302 tree att = build_tree_list (tx_qual, NULL_TREE);
10303 /* transaction_safe applies to the type, but
10304 transaction_safe_dynamic applies to the function. */
10305 if (is_attribute_p ("transaction_safe", tx_qual))
10306 attrs = chainon (attrs, att);
10308 returned_attrs = chainon (returned_attrs, att);
10313 The optional attribute-specifier-seq appertains to
10314 the function type. */
10315 decl_attributes (&type, attrs, 0);
10320 case cdk_reference:
10322 /* Filter out pointers-to-references and references-to-references.
10323 We can get these if a TYPE_DECL is used. */
10325 if (TREE_CODE (type) == REFERENCE_TYPE)
10327 if (declarator->kind != cdk_reference)
10329 error ("cannot declare pointer to %q#T", type);
10330 type = TREE_TYPE (type);
10333 /* In C++0x, we allow reference to reference declarations
10334 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
10335 and template type arguments [14.3.1/4 temp.arg.type]. The
10336 check for direct reference to reference declarations, which
10337 are still forbidden, occurs below. Reasoning behind the change
10338 can be found in DR106, DR540, and the rvalue reference
10340 else if (cxx_dialect == cxx98)
10342 error ("cannot declare reference to %q#T", type);
10343 type = TREE_TYPE (type);
10346 else if (VOID_TYPE_P (type))
10348 if (declarator->kind == cdk_reference)
10349 error ("cannot declare reference to %q#T", type);
10350 else if (declarator->kind == cdk_ptrmem)
10351 error ("cannot declare pointer to %q#T member", type);
10354 /* We now know that the TYPE_QUALS don't apply to the decl,
10355 but to the target of the pointer. */
10356 type_quals = TYPE_UNQUALIFIED;
10358 /* This code used to handle METHOD_TYPE, but I don't think it's
10359 possible to get it here anymore. */
10360 gcc_assert (TREE_CODE (type) != METHOD_TYPE);
10361 if (declarator->kind == cdk_ptrmem
10362 && TREE_CODE (type) == FUNCTION_TYPE)
10364 memfn_quals |= type_memfn_quals (type);
10365 type = build_memfn_type (type,
10366 declarator->u.pointer.class_type,
10369 if (type == error_mark_node)
10370 return error_mark_node;
10372 rqual = REF_QUAL_NONE;
10373 memfn_quals = TYPE_UNQUALIFIED;
10376 if (TREE_CODE (type) == FUNCTION_TYPE
10377 && (type_memfn_quals (type) != TYPE_UNQUALIFIED
10378 || type_memfn_rqual (type) != REF_QUAL_NONE))
10379 error (declarator->kind == cdk_reference
10380 ? G_("cannot declare reference to qualified function type %qT")
10381 : G_("cannot declare pointer to qualified function type %qT"),
10384 /* When the pointed-to type involves components of variable size,
10385 care must be taken to ensure that the size evaluation code is
10386 emitted early enough to dominate all the possible later uses
10387 and late enough for the variables on which it depends to have
10390 This is expected to happen automatically when the pointed-to
10391 type has a name/declaration of it's own, but special attention
10392 is required if the type is anonymous.
10394 We handle the NORMAL and FIELD contexts here by inserting a
10395 dummy statement that just evaluates the size at a safe point
10396 and ensures it is not deferred until e.g. within a deeper
10397 conditional context (c++/43555).
10399 We expect nothing to be needed here for PARM or TYPENAME.
10400 Evaluating the size at this point for TYPENAME would
10401 actually be incorrect, as we might be in the middle of an
10402 expression with side effects on the pointed-to type size
10403 "arguments" prior to the pointer declaration point and the
10404 size evaluation could end up prior to the side effects. */
10406 if (!TYPE_NAME (type)
10407 && (decl_context == NORMAL || decl_context == FIELD)
10408 && at_function_scope_p ()
10409 && variably_modified_type_p (type, NULL_TREE))
10410 /* Force evaluation of the SAVE_EXPR. */
10411 finish_expr_stmt (TYPE_SIZE (type));
10413 if (declarator->kind == cdk_reference)
10415 /* In C++0x, the type we are creating a reference to might be
10416 a typedef which is itself a reference type. In that case,
10417 we follow the reference collapsing rules in
10418 [7.1.3/8 dcl.typedef] to create the final reference type:
10420 "If a typedef TD names a type that is a reference to a type
10421 T, an attempt to create the type 'lvalue reference to cv TD'
10422 creates the type 'lvalue reference to T,' while an attempt
10423 to create the type "rvalue reference to cv TD' creates the
10426 if (VOID_TYPE_P (type))
10427 /* We already gave an error. */;
10428 else if (TREE_CODE (type) == REFERENCE_TYPE)
10430 if (declarator->u.reference.rvalue_ref)
10431 /* Leave type alone. */;
10433 type = cp_build_reference_type (TREE_TYPE (type), false);
10436 type = cp_build_reference_type
10437 (type, declarator->u.reference.rvalue_ref);
10439 /* In C++0x, we need this check for direct reference to
10440 reference declarations, which are forbidden by
10441 [8.3.2/5 dcl.ref]. Reference to reference declarations
10442 are only allowed indirectly through typedefs and template
10443 type arguments. Example:
10445 void foo(int & &); // invalid ref-to-ref decl
10447 typedef int & int_ref;
10448 void foo(int_ref &); // valid ref-to-ref decl
10450 if (inner_declarator && inner_declarator->kind == cdk_reference)
10451 error ("cannot declare reference to %q#T, which is not "
10452 "a typedef or a template type argument", type);
10454 else if (TREE_CODE (type) == METHOD_TYPE)
10455 type = build_ptrmemfunc_type (build_pointer_type (type));
10456 else if (declarator->kind == cdk_ptrmem)
10458 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
10459 != NAMESPACE_DECL);
10460 if (declarator->u.pointer.class_type == error_mark_node)
10461 /* We will already have complained. */
10462 type = error_mark_node;
10464 type = build_ptrmem_type (declarator->u.pointer.class_type,
10468 type = build_pointer_type (type);
10470 /* Process a list of type modifier keywords (such as
10471 const or volatile) that were given inside the `*' or `&'. */
10473 if (declarator->u.pointer.qualifiers)
10476 = cp_build_qualified_type (type,
10477 declarator->u.pointer.qualifiers);
10478 type_quals = cp_type_quals (type);
10481 /* Apply C++11 attributes to the pointer, and not to the
10482 type pointed to. This is unlike what is done for GNU
10483 attributes above. It is to comply with [dcl.ptr]/1:
10485 [the optional attribute-specifier-seq (7.6.1) appertains
10486 to the pointer and not to the object pointed to]. */
10487 if (declarator->std_attributes)
10488 decl_attributes (&type, declarator->std_attributes,
10498 gcc_unreachable ();
10502 /* A `constexpr' specifier used in an object declaration declares
10503 the object as `const'. */
10504 if (constexpr_p && innermost_code != cdk_function)
10506 /* DR1688 says that a `constexpr' specifier in combination with
10507 `volatile' is valid. */
10509 if (TREE_CODE (type) != REFERENCE_TYPE)
10511 type_quals |= TYPE_QUAL_CONST;
10512 type = cp_build_qualified_type (type, type_quals);
10516 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
10517 && TREE_CODE (type) != FUNCTION_TYPE
10518 && TREE_CODE (type) != METHOD_TYPE
10519 && !variable_template_p (TREE_OPERAND (unqualified_id, 0)))
10521 error ("template-id %qD used as a declarator",
10523 unqualified_id = dname;
10526 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
10527 qualified with a class-name, turn it into a METHOD_TYPE, unless
10528 we know that the function is static. We take advantage of this
10529 opportunity to do other processing that pertains to entities
10530 explicitly declared to be class members. Note that if DECLARATOR
10531 is non-NULL, we know it is a cdk_id declarator; otherwise, we
10532 would not have exited the loop above. */
10534 && declarator->u.id.qualifying_scope
10535 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
10537 ctype = declarator->u.id.qualifying_scope;
10538 ctype = TYPE_MAIN_VARIANT (ctype);
10539 template_count = num_template_headers_for_class (ctype);
10541 if (ctype == current_class_type)
10545 permerror (input_location, "member functions are implicitly friends of their class");
10549 permerror (declarator->id_loc,
10550 "extra qualification %<%T::%> on member %qs",
10553 else if (/* If the qualifying type is already complete, then we
10554 can skip the following checks. */
10555 !COMPLETE_TYPE_P (ctype)
10556 && (/* If the function is being defined, then
10557 qualifying type must certainly be complete. */
10559 /* A friend declaration of "T::f" is OK, even if
10560 "T" is a template parameter. But, if this
10561 function is not a friend, the qualifying type
10562 must be a class. */
10563 || (!friendp && !CLASS_TYPE_P (ctype))
10564 /* For a declaration, the type need not be
10565 complete, if either it is dependent (since there
10566 is no meaningful definition of complete in that
10567 case) or the qualifying class is currently being
10569 || !(dependent_type_p (ctype)
10570 || currently_open_class (ctype)))
10571 /* Check that the qualifying type is complete. */
10572 && !complete_type_or_else (ctype, NULL_TREE))
10573 return error_mark_node;
10574 else if (TREE_CODE (type) == FUNCTION_TYPE)
10576 if (current_class_type
10577 && (!friendp || funcdef_flag))
10579 error (funcdef_flag
10580 ? G_("cannot define member function %<%T::%s%> "
10582 : G_("cannot declare member function %<%T::%s%> "
10584 ctype, name, current_class_type);
10585 return error_mark_node;
10588 else if (typedef_p && current_class_type)
10590 error ("cannot declare member %<%T::%s%> within %qT",
10591 ctype, name, current_class_type);
10592 return error_mark_node;
10596 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
10597 ctype = current_class_type;
10599 /* Now TYPE has the actual type. */
10601 if (returned_attrs)
10604 *attrlist = chainon (returned_attrs, *attrlist);
10606 attrlist = &returned_attrs;
10610 && declarator->kind == cdk_id
10611 && declarator->std_attributes)
10612 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
10613 a declarator-id appertains to the entity that is declared. */
10614 *attrlist = chainon (*attrlist, declarator->std_attributes);
10616 /* Handle parameter packs. */
10617 if (parameter_pack_p)
10619 if (decl_context == PARM)
10620 /* Turn the type into a pack expansion.*/
10621 type = make_pack_expansion (type);
10623 error ("non-parameter %qs cannot be a parameter pack", name);
10626 if ((decl_context == FIELD || decl_context == PARM)
10627 && !processing_template_decl
10628 && variably_modified_type_p (type, NULL_TREE))
10630 if (decl_context == FIELD)
10631 error ("data member may not have variably modified type %qT", type);
10633 error ("parameter may not have variably modified type %qT", type);
10634 type = error_mark_node;
10637 if (explicitp == 1 || (explicitp && friendp))
10639 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
10640 in the declaration of a constructor or conversion function within
10641 a class definition. */
10642 if (!current_class_type)
10643 error_at (declspecs->locations[ds_explicit],
10644 "%<explicit%> outside class declaration");
10646 error_at (declspecs->locations[ds_explicit],
10647 "%<explicit%> in friend declaration");
10649 error_at (declspecs->locations[ds_explicit],
10650 "only declarations of constructors and conversion operators "
10651 "can be %<explicit%>");
10655 if (storage_class == sc_mutable)
10657 if (decl_context != FIELD || friendp)
10659 error ("non-member %qs cannot be declared %<mutable%>", name);
10660 storage_class = sc_none;
10662 else if (decl_context == TYPENAME || typedef_p)
10664 error ("non-object member %qs cannot be declared %<mutable%>", name);
10665 storage_class = sc_none;
10667 else if (TREE_CODE (type) == FUNCTION_TYPE
10668 || TREE_CODE (type) == METHOD_TYPE)
10670 error ("function %qs cannot be declared %<mutable%>", name);
10671 storage_class = sc_none;
10675 error ("static %qs cannot be declared %<mutable%>", name);
10676 storage_class = sc_none;
10678 else if (type_quals & TYPE_QUAL_CONST)
10680 error ("const %qs cannot be declared %<mutable%>", name);
10681 storage_class = sc_none;
10683 else if (TREE_CODE (type) == REFERENCE_TYPE)
10685 permerror (input_location, "reference %qs cannot be declared "
10686 "%<mutable%>", name);
10687 storage_class = sc_none;
10691 /* If this is declaring a typedef name, return a TYPE_DECL. */
10692 if (typedef_p && decl_context != TYPENAME)
10696 /* Note that the grammar rejects storage classes
10697 in typenames, fields or parameters. */
10698 if (current_lang_name == lang_name_java)
10699 TYPE_FOR_JAVA (type) = 1;
10701 /* This declaration:
10703 typedef void f(int) const;
10705 declares a function type which is not a member of any
10706 particular class, but which is cv-qualified; for
10707 example "f S::*" declares a pointer to a const-qualified
10708 member function of S. We record the cv-qualification in the
10710 if ((rqual || memfn_quals) && TREE_CODE (type) == FUNCTION_TYPE)
10712 type = apply_memfn_quals (type, memfn_quals, rqual);
10714 /* We have now dealt with these qualifiers. */
10715 memfn_quals = TYPE_UNQUALIFIED;
10716 rqual = REF_QUAL_NONE;
10719 if (type_uses_auto (type))
10721 error ("typedef declared %<auto%>");
10722 type = error_mark_node;
10726 error_at (location_of (reqs), "requires-clause on typedef");
10728 if (decl_context == FIELD)
10729 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
10731 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
10732 if (id_declarator && declarator->u.id.qualifying_scope) {
10733 error_at (DECL_SOURCE_LOCATION (decl),
10734 "typedef name may not be a nested-name-specifier");
10735 TREE_TYPE (decl) = error_mark_node;
10738 if (decl_context != FIELD)
10740 if (!current_function_decl)
10741 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
10742 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
10743 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
10744 (current_function_decl)))
10745 /* The TYPE_DECL is "abstract" because there will be
10746 clones of this constructor/destructor, and there will
10747 be copies of this TYPE_DECL generated in those
10748 clones. The decloning optimization (for space) may
10749 revert this subsequently if it determines that
10750 the clones should share a common implementation. */
10751 DECL_ABSTRACT_P (decl) = true;
10753 else if (current_class_type
10754 && constructor_name_p (unqualified_id, current_class_type))
10755 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
10756 "as enclosing class",
10759 /* If the user declares "typedef struct {...} foo" then the
10760 struct will have an anonymous name. Fill that name in now.
10761 Nothing can refer to it, so nothing needs know about the name
10763 if (type != error_mark_node
10765 && TYPE_NAME (type)
10766 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
10767 && TYPE_ANONYMOUS_P (type)
10768 && declspecs->type_definition_p
10769 && attributes_naming_typedef_ok (*attrlist)
10770 && cp_type_quals (type) == TYPE_UNQUALIFIED)
10774 /* Replace the anonymous name with the real name everywhere. */
10775 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
10777 if (anon_aggrname_p (TYPE_IDENTIFIER (t)))
10778 /* We do not rename the debug info representing the
10779 anonymous tagged type because the standard says in
10780 [dcl.typedef] that the naming applies only for
10781 linkage purposes. */
10782 /*debug_hooks->set_name (t, decl);*/
10783 TYPE_NAME (t) = decl;
10786 if (TYPE_LANG_SPECIFIC (type))
10787 TYPE_WAS_ANONYMOUS (type) = 1;
10789 /* If this is a typedef within a template class, the nested
10790 type is a (non-primary) template. The name for the
10791 template needs updating as well. */
10792 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
10793 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
10794 = TYPE_IDENTIFIER (type);
10796 /* Adjust linkage now that we aren't anonymous anymore. */
10797 reset_type_linkage (type);
10799 /* FIXME remangle member functions; member functions of a
10800 type with external linkage have external linkage. */
10804 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
10805 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
10807 bad_specifiers (decl, BSP_TYPE, virtualp,
10808 memfn_quals != TYPE_UNQUALIFIED,
10809 inlinep, friendp, raises != NULL_TREE);
10811 if (decl_spec_seq_has_spec_p (declspecs, ds_alias))
10812 /* Acknowledge that this was written:
10813 `using analias = atype;'. */
10814 TYPE_DECL_ALIAS_P (decl) = 1;
10819 /* Detect the case of an array type of unspecified size
10820 which came, as such, direct from a typedef name.
10821 We must copy the type, so that the array's domain can be
10822 individually set by the object's initializer. */
10824 if (type && typedef_type
10825 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
10826 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
10827 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
10829 /* Detect where we're using a typedef of function type to declare a
10830 function. PARMS will not be set, so we must create it now. */
10832 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
10834 tree decls = NULL_TREE;
10837 for (args = TYPE_ARG_TYPES (type);
10838 args && args != void_list_node;
10839 args = TREE_CHAIN (args))
10841 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
10843 DECL_CHAIN (decl) = decls;
10847 parms = nreverse (decls);
10849 if (decl_context != TYPENAME)
10851 /* The qualifiers on the function type become the qualifiers on
10852 the non-static member function. */
10853 memfn_quals |= type_memfn_quals (type);
10854 rqual = type_memfn_rqual (type);
10855 type_quals = TYPE_UNQUALIFIED;
10859 /* If this is a type name (such as, in a cast or sizeof),
10860 compute the type and return it now. */
10862 if (decl_context == TYPENAME)
10864 /* Note that here we don't care about type_quals. */
10866 /* Special case: "friend class foo" looks like a TYPENAME context. */
10871 error ("%<inline%> specified for friend class declaration");
10877 /* Don't allow friend declaration without a class-key. */
10878 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10879 permerror (input_location, "template parameters cannot be friends");
10880 else if (TREE_CODE (type) == TYPENAME_TYPE)
10881 permerror (input_location, "friend declaration requires class-key, "
10882 "i.e. %<friend class %T::%D%>",
10883 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
10885 permerror (input_location, "friend declaration requires class-key, "
10886 "i.e. %<friend %#T%>",
10890 /* Only try to do this stuff if we didn't already give up. */
10891 if (type != integer_type_node)
10893 /* A friendly class? */
10894 if (current_class_type)
10895 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
10896 /*complain=*/true);
10898 error ("trying to make class %qT a friend of global scope",
10901 type = void_type_node;
10904 else if (memfn_quals || rqual)
10906 if (ctype == NULL_TREE
10907 && TREE_CODE (type) == METHOD_TYPE)
10908 ctype = TYPE_METHOD_BASETYPE (type);
10911 type = build_memfn_type (type, ctype, memfn_quals, rqual);
10912 /* Core issue #547: need to allow this in template type args.
10913 Allow it in general in C++11 for alias-declarations. */
10914 else if ((template_type_arg || cxx_dialect >= cxx11)
10915 && TREE_CODE (type) == FUNCTION_TYPE)
10916 type = apply_memfn_quals (type, memfn_quals, rqual);
10918 error ("invalid qualifiers on non-member function type");
10922 error_at (location_of (reqs), "requires-clause on type-id");
10926 else if (unqualified_id == NULL_TREE && decl_context != PARM
10927 && decl_context != CATCHPARM
10928 && TREE_CODE (type) != UNION_TYPE
10931 error ("abstract declarator %qT used as declaration", type);
10932 return error_mark_node;
10935 /* Only functions may be declared using an operator-function-id. */
10937 && IDENTIFIER_OPNAME_P (unqualified_id)
10938 && TREE_CODE (type) != FUNCTION_TYPE
10939 && TREE_CODE (type) != METHOD_TYPE)
10941 error ("declaration of %qD as non-function", unqualified_id);
10942 return error_mark_node;
10946 && TREE_CODE (type) != FUNCTION_TYPE
10947 && TREE_CODE (type) != METHOD_TYPE)
10948 error_at (location_of (reqs),
10949 "requires-clause on declaration of non-function type %qT",
10952 /* We don't check parameter types here because we can emit a better
10953 error message later. */
10954 if (decl_context != PARM)
10956 type = check_var_type (unqualified_id, type);
10957 if (type == error_mark_node)
10958 return error_mark_node;
10961 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
10962 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
10964 if (decl_context == PARM || decl_context == CATCHPARM)
10966 if (ctype || in_namespace)
10967 error ("cannot use %<::%> in parameter declaration");
10969 if (type_uses_auto (type))
10971 if (cxx_dialect >= cxx14)
10972 error ("%<auto%> parameter not permitted in this context");
10974 error ("parameter declared %<auto%>");
10975 type = error_mark_node;
10978 /* A parameter declared as an array of T is really a pointer to T.
10979 One declared as a function is really a pointer to a function.
10980 One declared as a member is really a pointer to member. */
10982 if (TREE_CODE (type) == ARRAY_TYPE)
10984 /* Transfer const-ness of array into that of type pointed to. */
10985 type = build_pointer_type (TREE_TYPE (type));
10986 type_quals = TYPE_UNQUALIFIED;
10987 array_parameter_p = true;
10989 else if (TREE_CODE (type) == FUNCTION_TYPE)
10990 type = build_pointer_type (type);
10993 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
10994 && !NEW_DELETE_OPNAME_P (unqualified_id))
10996 cp_cv_quals real_quals = memfn_quals;
10997 if (cxx_dialect < cxx14 && constexpr_p
10998 && sfk != sfk_constructor && sfk != sfk_destructor)
10999 real_quals |= TYPE_QUAL_CONST;
11000 type = build_memfn_type (type, ctype, real_quals, rqual);
11004 tree decl = NULL_TREE;
11006 if (decl_context == PARM)
11008 decl = cp_build_parm_decl (unqualified_id, type);
11009 DECL_ARRAY_PARAMETER_P (decl) = array_parameter_p;
11011 bad_specifiers (decl, BSP_PARM, virtualp,
11012 memfn_quals != TYPE_UNQUALIFIED,
11013 inlinep, friendp, raises != NULL_TREE);
11015 else if (decl_context == FIELD)
11017 if (!staticp && !friendp && TREE_CODE (type) != METHOD_TYPE
11018 && type_uses_auto (type))
11020 error ("non-static data member declared %<auto%>");
11021 type = error_mark_node;
11024 /* The C99 flexible array extension. */
11025 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
11026 && TYPE_DOMAIN (type) == NULL_TREE)
11029 && (TREE_CODE (ctype) == UNION_TYPE
11030 || TREE_CODE (ctype) == QUAL_UNION_TYPE))
11032 error ("flexible array member in union");
11033 type = error_mark_node;
11037 /* Flexible array member has a null domain. */
11038 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
11042 if (type == error_mark_node)
11044 /* Happens when declaring arrays of sizes which
11045 are error_mark_node, for example. */
11048 else if (in_namespace && !friendp)
11050 /* Something like struct S { int N::j; }; */
11051 error ("invalid use of %<::%>");
11052 return error_mark_node;
11054 else if (TREE_CODE (type) == FUNCTION_TYPE
11055 || TREE_CODE (type) == METHOD_TYPE)
11058 tree function_context;
11062 /* This should never happen in pure C++ (the check
11063 could be an assert). It could happen in
11064 Objective-C++ if someone writes invalid code that
11065 uses a function declaration for an instance
11066 variable or property (instance variables and
11067 properties are parsed as FIELD_DECLs, but they are
11068 part of an Objective-C class, not a C++ class).
11069 That code is invalid and is caught by this
11073 error ("declaration of function %qD in invalid context",
11075 return error_mark_node;
11078 /* ``A union may [ ... ] not [ have ] virtual functions.''
11080 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
11082 error ("function %qD declared %<virtual%> inside a union",
11084 return error_mark_node;
11087 if (NEW_DELETE_OPNAME_P (unqualified_id))
11091 error ("%qD cannot be declared %<virtual%>, since it "
11092 "is always static",
11099 /* Check that the name used for a destructor makes sense. */
11100 if (sfk == sfk_destructor)
11102 tree uqname = id_declarator->u.id.unqualified_name;
11106 gcc_assert (friendp);
11107 error ("expected qualified name in friend declaration "
11108 "for destructor %qD", uqname);
11109 return error_mark_node;
11112 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
11114 error ("declaration of %qD as member of %qT",
11116 return error_mark_node;
11120 error ("a destructor cannot be %<concept%>");
11121 return error_mark_node;
11125 error ("a destructor cannot be %<constexpr%>");
11126 return error_mark_node;
11129 else if (sfk == sfk_constructor && friendp && !ctype)
11131 error ("expected qualified name in friend declaration "
11132 "for constructor %qD",
11133 id_declarator->u.id.unqualified_name);
11134 return error_mark_node;
11136 if (sfk == sfk_constructor)
11139 error ("a constructor cannot be %<concept%>");
11140 return error_mark_node;
11144 error ("a concept cannot be a member function");
11148 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
11150 tree tmpl = TREE_OPERAND (unqualified_id, 0);
11151 if (variable_template_p (tmpl))
11153 error ("specialization of variable template %qD "
11154 "declared as function", tmpl);
11155 inform (DECL_SOURCE_LOCATION (tmpl),
11156 "variable template declared here");
11157 return error_mark_node;
11161 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
11162 function_context = (ctype != NULL_TREE) ?
11163 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
11164 publicp = (! friendp || ! staticp)
11165 && function_context == NULL_TREE;
11167 if (late_return_type_p)
11168 TYPE_HAS_LATE_RETURN_TYPE (type) = 1;
11170 decl = grokfndecl (ctype, type,
11171 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
11172 ? unqualified_id : dname,
11176 virtualp, flags, memfn_quals, rqual, raises,
11177 friendp ? -1 : 0, friendp, publicp,
11178 inlinep | (2 * constexpr_p) | (4 * concept_p),
11179 initialized == SD_DELETED, sfk,
11180 funcdef_flag, template_count, in_namespace,
11181 attrlist, declarator->id_loc);
11182 decl = set_virt_specifiers (decl, virt_specifiers);
11183 if (decl == NULL_TREE)
11184 return error_mark_node;
11186 /* This clobbers the attrs stored in `decl' from `attrlist'. */
11187 /* The decl and setting of decl_attr is also turned off. */
11188 decl = build_decl_attribute_variant (decl, decl_attr);
11191 /* [class.conv.ctor]
11193 A constructor declared without the function-specifier
11194 explicit that can be called with a single parameter
11195 specifies a conversion from the type of its first
11196 parameter to the type of its class. Such a constructor
11197 is called a converting constructor. */
11198 if (explicitp == 2)
11199 DECL_NONCONVERTING_P (decl) = 1;
11201 else if (!staticp && !dependent_type_p (type)
11202 && !COMPLETE_TYPE_P (complete_type (type))
11203 && (!complete_or_array_type_p (type)
11204 || initialized == 0))
11206 if (TREE_CODE (type) != ARRAY_TYPE
11207 || !COMPLETE_TYPE_P (TREE_TYPE (type)))
11209 if (unqualified_id)
11211 error ("field %qD has incomplete type %qT",
11212 unqualified_id, type);
11213 cxx_incomplete_type_inform (strip_array_types (type));
11216 error ("name %qT has incomplete type", type);
11218 type = error_mark_node;
11226 error ("%qE is neither function nor member function; "
11227 "cannot be declared friend", unqualified_id);
11235 /* Friends are treated specially. */
11236 if (ctype == current_class_type)
11237 ; /* We already issued a permerror. */
11238 else if (decl && DECL_NAME (decl))
11240 if (template_class_depth (current_class_type) == 0)
11242 decl = check_explicit_specialization
11243 (unqualified_id, decl, template_count,
11244 2 * funcdef_flag + 4);
11245 if (decl == error_mark_node)
11246 return error_mark_node;
11249 decl = do_friend (ctype, unqualified_id, decl,
11255 return error_mark_node;
11258 /* Structure field. It may not be a function, except for C++. */
11260 if (decl == NULL_TREE)
11264 /* C++ allows static class members. All other work
11265 for this is done by grokfield. */
11266 decl = build_lang_decl_loc (declarator
11267 ? declarator->id_loc
11269 VAR_DECL, unqualified_id, type);
11270 set_linkage_for_static_data_member (decl);
11271 /* Even if there is an in-class initialization, DECL
11272 is considered undefined until an out-of-class
11273 definition is provided. */
11274 DECL_EXTERNAL (decl) = 1;
11278 CP_DECL_THREAD_LOCAL_P (decl) = true;
11279 if (!processing_template_decl)
11280 set_decl_tls_model (decl, decl_default_tls_model (decl));
11281 if (declspecs->gnu_thread_keyword_p)
11282 SET_DECL_GNU_TLS_P (decl);
11285 error ("static data member %qE declared %<concept%>",
11287 else if (constexpr_p && !initialized)
11289 error ("constexpr static data member %qD must have an "
11290 "initializer", decl);
11291 constexpr_p = false;
11297 error ("non-static data member %qE declared %<concept%>",
11299 else if (constexpr_p)
11301 error ("non-static data member %qE declared %<constexpr%>",
11303 constexpr_p = false;
11305 decl = build_decl (input_location,
11306 FIELD_DECL, unqualified_id, type);
11307 DECL_NONADDRESSABLE_P (decl) = bitfield;
11308 if (bitfield && !unqualified_id)
11309 TREE_NO_WARNING (decl) = 1;
11311 if (storage_class == sc_mutable)
11313 DECL_MUTABLE_P (decl) = 1;
11314 storage_class = sc_none;
11319 /* An attempt is being made to initialize a non-static
11320 member. This is new in C++11. */
11321 maybe_warn_cpp0x (CPP0X_NSDMI);
11323 /* If this has been parsed with static storage class, but
11324 errors forced staticp to be cleared, ensure NSDMI is
11326 if (declspecs->storage_class == sc_static)
11327 DECL_INITIAL (decl) = error_mark_node;
11331 bad_specifiers (decl, BSP_FIELD, virtualp,
11332 memfn_quals != TYPE_UNQUALIFIED,
11333 inlinep, friendp, raises != NULL_TREE);
11336 else if (TREE_CODE (type) == FUNCTION_TYPE
11337 || TREE_CODE (type) == METHOD_TYPE)
11339 tree original_name;
11342 if (!unqualified_id)
11343 return error_mark_node;
11345 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
11346 original_name = dname;
11348 original_name = unqualified_id;
11350 if (storage_class == sc_auto)
11351 error ("storage class %<auto%> invalid for function %qs", name);
11352 else if (storage_class == sc_register)
11353 error ("storage class %<register%> invalid for function %qs", name);
11356 if (declspecs->gnu_thread_keyword_p)
11357 error ("storage class %<__thread%> invalid for function %qs",
11360 error ("storage class %<thread_local%> invalid for function %qs",
11364 if (virt_specifiers)
11365 error ("virt-specifiers in %qs not allowed outside a class definition", name);
11366 /* Function declaration not at top level.
11367 Storage classes other than `extern' are not allowed
11368 and `extern' makes no difference. */
11369 if (! toplevel_bindings_p ()
11370 && (storage_class == sc_static
11371 || decl_spec_seq_has_spec_p (declspecs, ds_inline))
11374 if (storage_class == sc_static)
11375 pedwarn (input_location, OPT_Wpedantic,
11376 "%<static%> specified invalid for function %qs "
11377 "declared out of global scope", name);
11379 pedwarn (input_location, OPT_Wpedantic,
11380 "%<inline%> specifier invalid for function %qs "
11381 "declared out of global scope", name);
11384 if (ctype == NULL_TREE)
11388 error ("virtual non-class function %qs", name);
11391 else if (sfk == sfk_constructor
11392 || sfk == sfk_destructor)
11394 error (funcdef_flag
11395 ? G_("%qs defined in a non-class scope")
11396 : G_("%qs declared in a non-class scope"), name);
11401 /* Record whether the function is public. */
11402 publicp = (ctype != NULL_TREE
11403 || storage_class != sc_static);
11405 if (late_return_type_p)
11406 TYPE_HAS_LATE_RETURN_TYPE (type) = 1;
11408 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
11409 reqs, virtualp, flags, memfn_quals, rqual, raises,
11412 inlinep | (2 * constexpr_p) | (4 * concept_p),
11413 initialized == SD_DELETED,
11416 template_count, in_namespace, attrlist,
11417 declarator->id_loc);
11418 if (decl == NULL_TREE)
11419 return error_mark_node;
11423 int invalid_static = 0;
11425 /* Don't allow a static member function in a class, and forbid
11426 declaring main to be static. */
11427 if (TREE_CODE (type) == METHOD_TYPE)
11429 permerror (input_location, "cannot declare member function %qD to have "
11430 "static linkage", decl);
11431 invalid_static = 1;
11433 else if (current_function_decl)
11435 /* FIXME need arm citation */
11436 error ("cannot declare static function inside another function");
11437 invalid_static = 1;
11440 if (invalid_static)
11443 storage_class = sc_none;
11449 /* It's a variable. */
11451 /* An uninitialized decl with `extern' is a reference. */
11452 decl = grokvardecl (type, dname, unqualified_id,
11455 ((type_quals & TYPE_QUAL_CONST) != 0) | (2 * concept_p),
11457 ctype ? ctype : in_namespace);
11458 if (decl == NULL_TREE)
11459 return error_mark_node;
11461 bad_specifiers (decl, BSP_VAR, virtualp,
11462 memfn_quals != TYPE_UNQUALIFIED,
11463 inlinep, friendp, raises != NULL_TREE);
11467 DECL_CONTEXT (decl) = ctype;
11470 permerror (input_location, "%<static%> may not be used when defining "
11471 "(as opposed to declaring) a static data member");
11473 storage_class = sc_none;
11475 if (storage_class == sc_register && TREE_STATIC (decl))
11477 error ("static member %qD declared %<register%>", decl);
11478 storage_class = sc_none;
11480 if (storage_class == sc_extern && pedantic)
11482 pedwarn (input_location, OPT_Wpedantic,
11483 "cannot explicitly declare member %q#D to have "
11484 "extern linkage", decl);
11485 storage_class = sc_none;
11488 else if (constexpr_p && DECL_EXTERNAL (decl))
11490 error ("declaration of constexpr variable %qD is not a definition",
11492 constexpr_p = false;
11496 if (storage_class == sc_extern && initialized && !funcdef_flag)
11498 if (toplevel_bindings_p ())
11500 /* It's common practice (and completely valid) to have a const
11501 be initialized and declared extern. */
11502 if (!(type_quals & TYPE_QUAL_CONST))
11503 warning (0, "%qs initialized and declared %<extern%>", name);
11507 error ("%qs has both %<extern%> and initializer", name);
11508 return error_mark_node;
11512 /* Record `register' declaration for warnings on &
11513 and in case doing stupid register allocation. */
11515 if (storage_class == sc_register)
11516 DECL_REGISTER (decl) = 1;
11517 else if (storage_class == sc_extern)
11518 DECL_THIS_EXTERN (decl) = 1;
11519 else if (storage_class == sc_static)
11520 DECL_THIS_STATIC (decl) = 1;
11522 /* Set constexpr flag on vars (functions got it in grokfndecl). */
11523 if (constexpr_p && VAR_P (decl))
11524 DECL_DECLARED_CONSTEXPR_P (decl) = true;
11526 /* Record constancy and volatility on the DECL itself . There's
11527 no need to do this when processing a template; we'll do this
11528 for the instantiated declaration based on the type of DECL. */
11529 if (!processing_template_decl)
11530 cp_apply_type_quals_to_decl (type_quals, decl);
11536 /* Subroutine of start_function. Ensure that each of the parameter
11537 types (as listed in PARMS) is complete, as is required for a
11538 function definition. */
11541 require_complete_types_for_parms (tree parms)
11543 for (; parms; parms = DECL_CHAIN (parms))
11545 if (dependent_type_p (TREE_TYPE (parms)))
11547 if (!VOID_TYPE_P (TREE_TYPE (parms))
11548 && complete_type_or_else (TREE_TYPE (parms), parms))
11550 relayout_decl (parms);
11551 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
11554 /* grokparms or complete_type_or_else will have already issued
11556 TREE_TYPE (parms) = error_mark_node;
11560 /* Returns nonzero if T is a local variable. */
11563 local_variable_p (const_tree t)
11566 /* A VAR_DECL with a context that is a _TYPE is a static data
11568 && !TYPE_P (CP_DECL_CONTEXT (t))
11569 /* Any other non-local variable must be at namespace scope. */
11570 && !DECL_NAMESPACE_SCOPE_P (t))
11571 || (TREE_CODE (t) == PARM_DECL))
11577 /* Like local_variable_p, but suitable for use as a tree-walking
11581 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
11584 if (local_variable_p (*tp)
11585 && (!DECL_ARTIFICIAL (*tp) || DECL_NAME (*tp) == this_identifier))
11587 else if (TYPE_P (*tp))
11588 *walk_subtrees = 0;
11593 /* Check that ARG, which is a default-argument expression for a
11594 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
11595 something goes wrong. DECL may also be a _TYPE node, rather than a
11596 DECL, if there is no DECL available. */
11599 check_default_argument (tree decl, tree arg, tsubst_flags_t complain)
11604 if (TREE_CODE (arg) == DEFAULT_ARG)
11605 /* We get a DEFAULT_ARG when looking at an in-class declaration
11606 with a default argument. Ignore the argument for now; we'll
11607 deal with it after the class is complete. */
11616 decl_type = TREE_TYPE (decl);
11618 if (arg == error_mark_node
11619 || decl == error_mark_node
11620 || TREE_TYPE (arg) == error_mark_node
11621 || decl_type == error_mark_node)
11622 /* Something already went wrong. There's no need to check
11624 return error_mark_node;
11626 /* [dcl.fct.default]
11628 A default argument expression is implicitly converted to the
11630 ++cp_unevaluated_operand;
11631 perform_implicit_conversion_flags (decl_type, arg, complain,
11633 --cp_unevaluated_operand;
11635 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
11637 if (TYPE_PTR_OR_PTRMEM_P (decl_type)
11638 && null_ptr_cst_p (arg))
11639 return nullptr_node;
11641 /* [dcl.fct.default]
11643 Local variables shall not be used in default argument
11646 The keyword `this' shall not be used in a default argument of a
11647 member function. */
11648 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
11651 if (complain & tf_warning_or_error)
11653 if (DECL_NAME (var) == this_identifier)
11654 permerror (input_location, "default argument %qE uses %qD",
11657 error ("default argument %qE uses local variable %qD", arg, var);
11659 return error_mark_node;
11666 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
11669 type_is_deprecated (tree type)
11671 enum tree_code code;
11672 if (TREE_DEPRECATED (type))
11674 if (TYPE_NAME (type))
11676 if (TREE_DEPRECATED (TYPE_NAME (type)))
11682 /* Do warn about using typedefs to a deprecated class. */
11683 if (OVERLOAD_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
11684 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
11686 code = TREE_CODE (type);
11688 if (code == POINTER_TYPE || code == REFERENCE_TYPE
11689 || code == OFFSET_TYPE || code == FUNCTION_TYPE
11690 || code == METHOD_TYPE || code == ARRAY_TYPE)
11691 return type_is_deprecated (TREE_TYPE (type));
11693 if (TYPE_PTRMEMFUNC_P (type))
11694 return type_is_deprecated
11695 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
11700 /* Decode the list of parameter types for a function type.
11701 Given the list of things declared inside the parens,
11702 return a list of types.
11704 If this parameter does not end with an ellipsis, we append
11707 *PARMS is set to the chain of PARM_DECLs created. */
11710 grokparms (tree parmlist, tree *parms)
11712 tree result = NULL_TREE;
11713 tree decls = NULL_TREE;
11717 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
11719 tree type = NULL_TREE;
11720 tree init = TREE_PURPOSE (parm);
11721 tree decl = TREE_VALUE (parm);
11722 const char *errmsg;
11724 if (parm == void_list_node)
11727 if (! decl || TREE_TYPE (decl) == error_mark_node)
11730 type = TREE_TYPE (decl);
11731 if (VOID_TYPE_P (type))
11733 if (same_type_p (type, void_type_node)
11735 && !DECL_NAME (decl) && !result
11736 && TREE_CHAIN (parm) == void_list_node)
11737 /* DR 577: A parameter list consisting of a single
11738 unnamed parameter of non-dependent type 'void'. */
11740 else if (cv_qualified_p (type))
11741 error_at (DECL_SOURCE_LOCATION (decl),
11742 "invalid use of cv-qualified type %qT in "
11743 "parameter declaration", type);
11745 error_at (DECL_SOURCE_LOCATION (decl),
11746 "invalid use of type %<void%> in parameter "
11748 /* It's not a good idea to actually create parameters of
11749 type `void'; other parts of the compiler assume that a
11750 void type terminates the parameter list. */
11751 type = error_mark_node;
11752 TREE_TYPE (decl) = error_mark_node;
11755 if (type != error_mark_node
11756 && TYPE_FOR_JAVA (type)
11757 && MAYBE_CLASS_TYPE_P (type))
11759 error ("parameter %qD has Java class type", decl);
11760 type = error_mark_node;
11761 TREE_TYPE (decl) = error_mark_node;
11765 if (type != error_mark_node
11766 && (errmsg = targetm.invalid_parameter_type (type)))
11769 type = error_mark_node;
11770 TREE_TYPE (decl) = error_mark_node;
11773 if (type != error_mark_node)
11775 if (deprecated_state != DEPRECATED_SUPPRESS)
11777 tree deptype = type_is_deprecated (type);
11779 warn_deprecated_use (deptype, NULL_TREE);
11782 /* Top-level qualifiers on the parameters are
11783 ignored for function types. */
11784 type = cp_build_qualified_type (type, 0);
11785 if (TREE_CODE (type) == METHOD_TYPE)
11787 error ("parameter %qD invalidly declared method type", decl);
11788 type = build_pointer_type (type);
11789 TREE_TYPE (decl) = type;
11791 else if (abstract_virtuals_error (decl, type))
11792 any_error = 1; /* Seems like a good idea. */
11793 else if (POINTER_TYPE_P (type))
11795 /* [dcl.fct]/6, parameter types cannot contain pointers
11796 (references) to arrays of unknown bound. */
11797 tree t = TREE_TYPE (type);
11798 int ptr = TYPE_PTR_P (type);
11802 if (TYPE_PTR_P (t))
11804 else if (TREE_CODE (t) != ARRAY_TYPE)
11806 else if (!TYPE_DOMAIN (t))
11810 if (TREE_CODE (t) == ARRAY_TYPE)
11812 ? G_("parameter %qD includes pointer to array of "
11813 "unknown bound %qT")
11814 : G_("parameter %qD includes reference to array of "
11815 "unknown bound %qT"),
11821 else if (init && !processing_template_decl)
11822 init = check_default_argument (decl, init, tf_warning_or_error);
11825 DECL_CHAIN (decl) = decls;
11827 result = tree_cons (init, type, result);
11829 decls = nreverse (decls);
11830 result = nreverse (result);
11832 result = chainon (result, void_list_node);
11839 /* D is a constructor or overloaded `operator='.
11841 Let T be the class in which D is declared. Then, this function
11844 -1 if D's is an ill-formed constructor or copy assignment operator
11845 whose first parameter is of type `T'.
11846 0 if D is not a copy constructor or copy assignment
11848 1 if D is a copy constructor or copy assignment operator whose
11849 first parameter is a reference to non-const qualified T.
11850 2 if D is a copy constructor or copy assignment operator whose
11851 first parameter is a reference to const qualified T.
11853 This function can be used as a predicate. Positive values indicate
11854 a copy constructor and nonzero values indicate a copy assignment
11858 copy_fn_p (const_tree d)
11864 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
11866 if (TREE_CODE (d) == TEMPLATE_DECL
11867 || (DECL_TEMPLATE_INFO (d)
11868 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
11869 /* Instantiations of template member functions are never copy
11870 functions. Note that member functions of templated classes are
11871 represented as template functions internally, and we must
11872 accept those as copy functions. */
11875 args = FUNCTION_FIRST_USER_PARMTYPE (d);
11879 arg_type = TREE_VALUE (args);
11880 if (arg_type == error_mark_node)
11883 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
11885 /* Pass by value copy assignment operator. */
11888 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
11889 && !TYPE_REF_IS_RVALUE (arg_type)
11890 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
11892 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
11898 args = TREE_CHAIN (args);
11900 if (args && args != void_list_node && !TREE_PURPOSE (args))
11901 /* There are more non-optional args. */
11907 /* D is a constructor or overloaded `operator='.
11909 Let T be the class in which D is declared. Then, this function
11910 returns true when D is a move constructor or move assignment
11911 operator, false otherwise. */
11914 move_fn_p (const_tree d)
11916 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
11918 if (cxx_dialect == cxx98)
11919 /* There are no move constructors if we are in C++98 mode. */
11922 if (TREE_CODE (d) == TEMPLATE_DECL
11923 || (DECL_TEMPLATE_INFO (d)
11924 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
11925 /* Instantiations of template member functions are never move
11926 functions. Note that member functions of templated classes are
11927 represented as template functions internally, and we must
11928 accept those as move functions. */
11931 return move_signature_fn_p (d);
11934 /* D is a constructor or overloaded `operator='.
11936 Then, this function returns true when D has the same signature as a move
11937 constructor or move assignment operator (because either it is such a
11938 ctor/op= or it is a template specialization with the same signature),
11939 false otherwise. */
11942 move_signature_fn_p (const_tree d)
11946 bool result = false;
11948 args = FUNCTION_FIRST_USER_PARMTYPE (d);
11952 arg_type = TREE_VALUE (args);
11953 if (arg_type == error_mark_node)
11956 if (TREE_CODE (arg_type) == REFERENCE_TYPE
11957 && TYPE_REF_IS_RVALUE (arg_type)
11958 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
11962 args = TREE_CHAIN (args);
11964 if (args && args != void_list_node && !TREE_PURPOSE (args))
11965 /* There are more non-optional args. */
11971 /* Remember any special properties of member function DECL. */
11974 grok_special_member_properties (tree decl)
11978 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
11981 class_type = DECL_CONTEXT (decl);
11982 if (DECL_CONSTRUCTOR_P (decl))
11984 int ctor = copy_fn_p (decl);
11986 if (!DECL_ARTIFICIAL (decl))
11987 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
11993 A non-template constructor for class X is a copy
11994 constructor if its first parameter is of type X&, const
11995 X&, volatile X& or const volatile X&, and either there
11996 are no other parameters or else all other parameters have
11997 default arguments. */
11998 TYPE_HAS_COPY_CTOR (class_type) = 1;
11999 if (user_provided_p (decl))
12000 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
12002 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
12004 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
12005 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
12006 else if (move_fn_p (decl) && user_provided_p (decl))
12007 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
12008 else if (is_list_ctor (decl))
12009 TYPE_HAS_LIST_CTOR (class_type) = 1;
12011 if (DECL_DECLARED_CONSTEXPR_P (decl)
12012 && !copy_fn_p (decl) && !move_fn_p (decl))
12013 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
12015 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
12019 A non-template assignment operator for class X is a copy
12020 assignment operator if its parameter is of type X, X&, const
12021 X&, volatile X& or const volatile X&. */
12023 int assop = copy_fn_p (decl);
12027 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
12028 if (user_provided_p (decl))
12029 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
12031 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
12033 else if (move_fn_p (decl) && user_provided_p (decl))
12034 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
12036 /* Destructors are handled in check_methods. */
12039 /* Check a constructor DECL has the correct form. Complains
12040 if the class has a constructor of the form X(X). */
12043 grok_ctor_properties (const_tree ctype, const_tree decl)
12045 int ctor_parm = copy_fn_p (decl);
12051 A declaration of a constructor for a class X is ill-formed if
12052 its first parameter is of type (optionally cv-qualified) X
12053 and either there are no other parameters or else all other
12054 parameters have default arguments.
12056 We *don't* complain about member template instantiations that
12057 have this form, though; they can occur as we try to decide
12058 what constructor to use during overload resolution. Since
12059 overload resolution will never prefer such a constructor to
12060 the non-template copy constructor (which is either explicitly
12061 or implicitly defined), there's no need to worry about their
12062 existence. Theoretically, they should never even be
12063 instantiated, but that's hard to forestall. */
12064 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
12072 /* An operator with this code is unary, but can also be binary. */
12075 ambi_op_p (enum tree_code code)
12077 return (code == INDIRECT_REF
12078 || code == ADDR_EXPR
12079 || code == UNARY_PLUS_EXPR
12080 || code == NEGATE_EXPR
12081 || code == PREINCREMENT_EXPR
12082 || code == PREDECREMENT_EXPR);
12085 /* An operator with this name can only be unary. */
12088 unary_op_p (enum tree_code code)
12090 return (code == TRUTH_NOT_EXPR
12091 || code == BIT_NOT_EXPR
12092 || code == COMPONENT_REF
12093 || code == TYPE_EXPR);
12096 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
12097 errors are issued for invalid declarations. */
12100 grok_op_properties (tree decl, bool complain)
12102 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
12104 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
12105 tree name = DECL_NAME (decl);
12106 enum tree_code operator_code;
12111 /* Count the number of arguments and check for ellipsis. */
12112 for (argtype = argtypes, arity = 0;
12113 argtype && argtype != void_list_node;
12114 argtype = TREE_CHAIN (argtype))
12116 ellipsis_p = !argtype;
12118 class_type = DECL_CONTEXT (decl);
12119 if (class_type && !CLASS_TYPE_P (class_type))
12120 class_type = NULL_TREE;
12122 if (DECL_CONV_FN_P (decl))
12123 operator_code = TYPE_EXPR;
12127 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
12128 if (ansi_opname (CODE) == name) \
12130 operator_code = (CODE); \
12133 else if (ansi_assopname (CODE) == name) \
12135 operator_code = (CODE); \
12136 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
12140 #include "operators.def"
12141 #undef DEF_OPERATOR
12143 gcc_unreachable ();
12146 gcc_assert (operator_code != MAX_TREE_CODES);
12147 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
12150 switch (operator_code)
12153 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
12157 TYPE_GETS_DELETE (class_type) |= 1;
12161 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
12164 case VEC_DELETE_EXPR:
12165 TYPE_GETS_DELETE (class_type) |= 2;
12172 /* [basic.std.dynamic.allocation]/1:
12174 A program is ill-formed if an allocation function is declared
12175 in a namespace scope other than global scope or declared static
12178 The same also holds true for deallocation functions. */
12179 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
12180 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
12182 if (DECL_NAMESPACE_SCOPE_P (decl))
12184 if (CP_DECL_CONTEXT (decl) != global_namespace)
12186 error ("%qD may not be declared within a namespace", decl);
12189 else if (!TREE_PUBLIC (decl))
12191 error ("%qD may not be declared as static", decl);
12197 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
12199 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
12200 DECL_IS_OPERATOR_NEW (decl) = 1;
12202 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
12203 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
12206 /* An operator function must either be a non-static member function
12207 or have at least one parameter of a class, a reference to a class,
12208 an enumeration, or a reference to an enumeration. 13.4.0.6 */
12209 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
12211 if (operator_code == TYPE_EXPR
12212 || operator_code == CALL_EXPR
12213 || operator_code == COMPONENT_REF
12214 || operator_code == ARRAY_REF
12215 || operator_code == NOP_EXPR)
12217 error ("%qD must be a nonstatic member function", decl);
12224 if (DECL_STATIC_FUNCTION_P (decl))
12226 error ("%qD must be either a non-static member "
12227 "function or a non-member function", decl);
12231 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
12233 tree arg = non_reference (TREE_VALUE (p));
12234 if (arg == error_mark_node)
12237 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
12238 because these checks are performed even on
12239 template functions. */
12240 if (MAYBE_CLASS_TYPE_P (arg)
12241 || TREE_CODE (arg) == ENUMERAL_TYPE)
12245 if (!p || p == void_list_node)
12248 error ("%qD must have an argument of class or "
12249 "enumerated type", decl);
12255 /* There are no restrictions on the arguments to an overloaded
12257 if (operator_code == CALL_EXPR)
12260 /* Warn about conversion operators that will never be used. */
12261 if (IDENTIFIER_TYPENAME_P (name)
12262 && ! DECL_TEMPLATE_INFO (decl)
12264 /* Warn only declaring the function; there is no need to
12265 warn again about out-of-class definitions. */
12266 && class_type == current_class_type)
12268 tree t = TREE_TYPE (name);
12269 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
12272 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
12274 if (VOID_TYPE_P (t))
12275 warning (OPT_Wconversion,
12277 ? G_("conversion to a reference to void "
12278 "will never use a type conversion operator")
12279 : G_("conversion to void "
12280 "will never use a type conversion operator"));
12281 else if (class_type)
12283 if (t == class_type)
12284 warning (OPT_Wconversion,
12286 ? G_("conversion to a reference to the same type "
12287 "will never use a type conversion operator")
12288 : G_("conversion to the same type "
12289 "will never use a type conversion operator"));
12290 /* Don't force t to be complete here. */
12291 else if (MAYBE_CLASS_TYPE_P (t)
12292 && COMPLETE_TYPE_P (t)
12293 && DERIVED_FROM_P (t, class_type))
12294 warning (OPT_Wconversion,
12296 ? G_("conversion to a reference to a base class "
12297 "will never use a type conversion operator")
12298 : G_("conversion to a base class "
12299 "will never use a type conversion operator"));
12304 if (operator_code == COND_EXPR)
12307 error ("ISO C++ prohibits overloading operator ?:");
12310 else if (ellipsis_p)
12312 error ("%qD must not have variable number of arguments", decl);
12315 else if (ambi_op_p (operator_code))
12318 /* We pick the one-argument operator codes by default, so
12319 we don't have to change anything. */
12321 else if (arity == 2)
12323 /* If we thought this was a unary operator, we now know
12324 it to be a binary operator. */
12325 switch (operator_code)
12328 operator_code = MULT_EXPR;
12332 operator_code = BIT_AND_EXPR;
12335 case UNARY_PLUS_EXPR:
12336 operator_code = PLUS_EXPR;
12340 operator_code = MINUS_EXPR;
12343 case PREINCREMENT_EXPR:
12344 operator_code = POSTINCREMENT_EXPR;
12347 case PREDECREMENT_EXPR:
12348 operator_code = POSTDECREMENT_EXPR;
12352 gcc_unreachable ();
12355 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
12357 if ((operator_code == POSTINCREMENT_EXPR
12358 || operator_code == POSTDECREMENT_EXPR)
12359 && ! processing_template_decl
12360 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
12363 error ("postfix %qD must take %<int%> as its argument",
12366 error ("postfix %qD must take %<int%> as its second "
12374 error ("%qD must take either zero or one argument", decl);
12376 error ("%qD must take either one or two arguments", decl);
12380 /* More Effective C++ rule 6. */
12382 && (operator_code == POSTINCREMENT_EXPR
12383 || operator_code == POSTDECREMENT_EXPR
12384 || operator_code == PREINCREMENT_EXPR
12385 || operator_code == PREDECREMENT_EXPR))
12387 tree arg = TREE_VALUE (argtypes);
12388 tree ret = TREE_TYPE (TREE_TYPE (decl));
12389 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
12390 arg = TREE_TYPE (arg);
12391 arg = TYPE_MAIN_VARIANT (arg);
12392 if (operator_code == PREINCREMENT_EXPR
12393 || operator_code == PREDECREMENT_EXPR)
12395 if (TREE_CODE (ret) != REFERENCE_TYPE
12396 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
12398 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
12399 build_reference_type (arg));
12403 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
12404 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
12408 else if (unary_op_p (operator_code))
12413 error ("%qD must take %<void%>", decl);
12415 error ("%qD must take exactly one argument", decl);
12419 else /* if (binary_op_p (operator_code)) */
12424 error ("%qD must take exactly one argument", decl);
12426 error ("%qD must take exactly two arguments", decl);
12430 /* More Effective C++ rule 7. */
12432 && (operator_code == TRUTH_ANDIF_EXPR
12433 || operator_code == TRUTH_ORIF_EXPR
12434 || operator_code == COMPOUND_EXPR))
12435 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
12439 /* Effective C++ rule 23. */
12442 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
12443 && (operator_code == PLUS_EXPR
12444 || operator_code == MINUS_EXPR
12445 || operator_code == TRUNC_DIV_EXPR
12446 || operator_code == MULT_EXPR
12447 || operator_code == TRUNC_MOD_EXPR)
12448 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
12449 warning (OPT_Weffc__, "%qD should return by value", decl);
12451 /* [over.oper]/8 */
12452 for (; argtypes && argtypes != void_list_node;
12453 argtypes = TREE_CHAIN (argtypes))
12454 if (TREE_PURPOSE (argtypes))
12456 TREE_PURPOSE (argtypes) = NULL_TREE;
12457 if (operator_code == POSTINCREMENT_EXPR
12458 || operator_code == POSTDECREMENT_EXPR)
12460 pedwarn (input_location, OPT_Wpedantic, "%qD cannot have default arguments",
12465 error ("%qD cannot have default arguments", decl);
12473 /* Return a string giving the keyword associate with CODE. */
12475 static const char *
12476 tag_name (enum tag_types code)
12488 case typename_type:
12491 gcc_unreachable ();
12495 /* Name lookup in an elaborated-type-specifier (after the keyword
12496 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
12497 elaborated-type-specifier is invalid, issue a diagnostic and return
12498 error_mark_node; otherwise, return the *_TYPE to which it referred.
12499 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
12502 check_elaborated_type_specifier (enum tag_types tag_code,
12504 bool allow_template_p)
12510 struct S { struct S *p; };
12512 name lookup will find the TYPE_DECL for the implicit "S::S"
12513 typedef. Adjust for that here. */
12514 if (DECL_SELF_REFERENCE_P (decl))
12515 decl = TYPE_NAME (TREE_TYPE (decl));
12517 type = TREE_TYPE (decl);
12519 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
12520 is false for this case as well. */
12521 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
12523 error ("using template type parameter %qT after %qs",
12524 type, tag_name (tag_code));
12525 return error_mark_node;
12527 /* Accept template template parameters. */
12528 else if (allow_template_p
12529 && (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM
12530 || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM))
12534 If the identifier resolves to a typedef-name or the
12535 simple-template-id resolves to an alias template
12536 specialization, the elaborated-type-specifier is ill-formed.
12538 In other words, the only legitimate declaration to use in the
12539 elaborated type specifier is the implicit typedef created when
12540 the type is declared. */
12541 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
12542 && !DECL_SELF_REFERENCE_P (decl)
12543 && tag_code != typename_type)
12545 if (alias_template_specialization_p (type))
12546 error ("using alias template specialization %qT after %qs",
12547 type, tag_name (tag_code));
12549 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
12550 inform (DECL_SOURCE_LOCATION (decl),
12551 "%qD has a previous declaration here", decl);
12552 return error_mark_node;
12554 else if (TREE_CODE (type) != RECORD_TYPE
12555 && TREE_CODE (type) != UNION_TYPE
12556 && tag_code != enum_type
12557 && tag_code != typename_type)
12559 error ("%qT referred to as %qs", type, tag_name (tag_code));
12560 inform (input_location, "%q+T has a previous declaration here", type);
12561 return error_mark_node;
12563 else if (TREE_CODE (type) != ENUMERAL_TYPE
12564 && tag_code == enum_type)
12566 error ("%qT referred to as enum", type);
12567 inform (input_location, "%q+T has a previous declaration here", type);
12568 return error_mark_node;
12570 else if (!allow_template_p
12571 && TREE_CODE (type) == RECORD_TYPE
12572 && CLASSTYPE_IS_TEMPLATE (type))
12574 /* If a class template appears as elaborated type specifier
12575 without a template header such as:
12577 template <class T> class C {};
12578 void f(class C); // No template header here
12580 then the required template argument is missing. */
12581 error ("template argument required for %<%s %T%>",
12582 tag_name (tag_code),
12583 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
12584 return error_mark_node;
12590 /* Lookup NAME in elaborate type specifier in scope according to
12591 SCOPE and issue diagnostics if necessary.
12592 Return *_TYPE node upon success, NULL_TREE when the NAME is not
12593 found, and ERROR_MARK_NODE for type error. */
12596 lookup_and_check_tag (enum tag_types tag_code, tree name,
12597 tag_scope scope, bool template_header_p)
12601 if (scope == ts_global)
12603 /* First try ordinary name lookup, ignoring hidden class name
12604 injected via friend declaration. */
12605 decl = lookup_name_prefer_type (name, 2);
12606 decl = strip_using_decl (decl);
12607 /* If that fails, the name will be placed in the smallest
12608 non-class, non-function-prototype scope according to 3.3.1/5.
12609 We may already have a hidden name declared as friend in this
12610 scope. So lookup again but not ignoring hidden names.
12611 If we find one, that name will be made visible rather than
12612 creating a new tag. */
12614 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
12617 decl = lookup_type_scope (name, scope);
12620 && (DECL_CLASS_TEMPLATE_P (decl)
12621 /* If scope is ts_current we're defining a class, so ignore a
12622 template template parameter. */
12623 || (scope != ts_current
12624 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl))))
12625 decl = DECL_TEMPLATE_RESULT (decl);
12627 if (decl && TREE_CODE (decl) == TYPE_DECL)
12629 /* Look for invalid nested type:
12633 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
12635 error ("%qD has the same name as the class in which it is "
12638 return error_mark_node;
12641 /* Two cases we need to consider when deciding if a class
12642 template is allowed as an elaborated type specifier:
12643 1. It is a self reference to its own class.
12644 2. It comes with a template header.
12648 template <class T> class C {
12649 class C *c1; // DECL_SELF_REFERENCE_P is true
12652 template <class U> class C; // template_header_p is true
12653 template <class T> class C<T>::D {
12654 class C *c2; // DECL_SELF_REFERENCE_P is true
12657 t = check_elaborated_type_specifier (tag_code,
12660 | DECL_SELF_REFERENCE_P (decl));
12661 if (template_header_p && t && CLASS_TYPE_P (t)
12662 && (!CLASSTYPE_TEMPLATE_INFO (t)
12663 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))))
12665 error ("%qT is not a template", t);
12666 inform (location_of (t), "previous declaration here");
12667 if (TYPE_CLASS_SCOPE_P (t)
12668 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t)))
12669 inform (input_location,
12670 "perhaps you want to explicitly add %<%T::%>",
12672 t = error_mark_node;
12677 else if (decl && TREE_CODE (decl) == TREE_LIST)
12679 error ("reference to %qD is ambiguous", name);
12680 print_candidates (decl);
12681 return error_mark_node;
12687 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
12688 Define the tag as a forward-reference if it is not defined.
12690 If a declaration is given, process it here, and report an error if
12691 multiple declarations are not identical.
12693 SCOPE is TS_CURRENT when this is also a definition. Only look in
12694 the current frame for the name (since C++ allows new names in any
12695 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
12696 declaration. Only look beginning from the current scope outward up
12697 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
12699 TEMPLATE_HEADER_P is true when this declaration is preceded by
12700 a set of template parameters. */
12703 xref_tag_1 (enum tag_types tag_code, tree name,
12704 tag_scope orig_scope, bool template_header_p)
12706 enum tree_code code;
12708 tree context = NULL_TREE;
12711 gcc_assert (identifier_p (name));
12717 code = RECORD_TYPE;
12723 code = ENUMERAL_TYPE;
12726 gcc_unreachable ();
12729 if (orig_scope == ts_lambda)
12730 scope = ts_current;
12732 scope = orig_scope;
12734 /* In case of anonymous name, xref_tag is only called to
12735 make type node and push name. Name lookup is not required. */
12736 if (anon_aggrname_p (name))
12739 t = lookup_and_check_tag (tag_code, name,
12740 scope, template_header_p);
12742 if (t == error_mark_node)
12743 return error_mark_node;
12745 if (scope != ts_current && t && current_class_type
12746 && template_class_depth (current_class_type)
12747 && template_header_p)
12749 if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM)
12752 /* Since SCOPE is not TS_CURRENT, we are not looking at a
12753 definition of this tag. Since, in addition, we are currently
12754 processing a (member) template declaration of a template
12755 class, we must be very careful; consider:
12762 { template <class V>
12763 friend struct S1; };
12765 Here, the S2::S1 declaration should not be confused with the
12766 outer declaration. In particular, the inner version should
12767 have a template parameter of level 2, not level 1. This
12768 would be particularly important if the member declaration
12771 template <class V = U> friend struct S1;
12773 say, when we should tsubst into `U' when instantiating
12774 S2. On the other hand, when presented with:
12784 we must find the inner binding eventually. We
12785 accomplish this by making sure that the new type we
12786 create to represent this declaration has the right
12788 context = TYPE_CONTEXT (t);
12794 /* If no such tag is yet defined, create a forward-reference node
12795 and record it as the "definition".
12796 When a real declaration of this type is found,
12797 the forward-reference will be altered into a real type. */
12798 if (code == ENUMERAL_TYPE)
12800 error ("use of enum %q#D without previous declaration", name);
12801 return error_mark_node;
12805 t = make_class_type (code);
12806 TYPE_CONTEXT (t) = context;
12807 if (orig_scope == ts_lambda)
12808 /* Remember that we're declaring a lambda to avoid bogus errors
12809 in push_template_decl. */
12810 CLASSTYPE_LAMBDA_EXPR (t) = error_mark_node;
12811 t = pushtag (name, t, scope);
12816 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
12818 /* Check that we aren't trying to overload a class with different
12820 tree constr = NULL_TREE;
12821 if (current_template_parms)
12823 tree reqs = TEMPLATE_PARMS_CONSTRAINTS (current_template_parms);
12824 constr = build_constraints (reqs, NULL_TREE);
12826 if (!redeclare_class_template (t, current_template_parms, constr))
12827 return error_mark_node;
12829 else if (!processing_template_decl
12830 && CLASS_TYPE_P (t)
12831 && CLASSTYPE_IS_TEMPLATE (t))
12833 error ("redeclaration of %qT as a non-template", t);
12834 error ("previous declaration %q+D", t);
12835 return error_mark_node;
12838 /* Make injected friend class visible. */
12839 if (scope != ts_within_enclosing_non_class
12840 && hidden_name_p (TYPE_NAME (t)))
12842 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
12843 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
12845 if (TYPE_TEMPLATE_INFO (t))
12847 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
12848 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
12856 /* Wrapper for xref_tag_1. */
12859 xref_tag (enum tag_types tag_code, tree name,
12860 tag_scope scope, bool template_header_p)
12864 subtime = timevar_cond_start (TV_NAME_LOOKUP);
12865 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
12866 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
12872 xref_tag_from_type (tree old, tree id, tag_scope scope)
12874 enum tag_types tag_kind;
12876 if (TREE_CODE (old) == RECORD_TYPE)
12877 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
12879 tag_kind = union_type;
12881 if (id == NULL_TREE)
12882 id = TYPE_IDENTIFIER (old);
12884 return xref_tag (tag_kind, id, scope, false);
12887 /* Create the binfo hierarchy for REF with (possibly NULL) base list
12888 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
12889 access_* node, and the TREE_VALUE is the type of the base-class.
12890 Non-NULL TREE_TYPE indicates virtual inheritance.
12892 Returns true if the binfo hierarchy was successfully created,
12893 false if an error was detected. */
12896 xref_basetypes (tree ref, tree base_list)
12899 tree binfo, base_binfo;
12900 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
12901 unsigned max_bases = 0; /* Maximum direct bases. */
12902 unsigned max_dvbases = 0; /* Maximum direct virtual bases. */
12904 tree default_access;
12905 tree igo_prev; /* Track Inheritance Graph Order. */
12907 if (ref == error_mark_node)
12910 /* The base of a derived class is private by default, all others are
12912 default_access = (TREE_CODE (ref) == RECORD_TYPE
12913 && CLASSTYPE_DECLARED_CLASS (ref)
12914 ? access_private_node : access_public_node);
12916 /* First, make sure that any templates in base-classes are
12917 instantiated. This ensures that if we call ourselves recursively
12918 we do not get confused about which classes are marked and which
12920 basep = &base_list;
12923 tree basetype = TREE_VALUE (*basep);
12925 /* The dependent_type_p call below should really be dependent_scope_p
12926 so that we give a hard error about using an incomplete type as a
12927 base, but we allow it with a pedwarn for backward
12929 if (processing_template_decl
12930 && CLASS_TYPE_P (basetype) && TYPE_BEING_DEFINED (basetype))
12931 cxx_incomplete_type_diagnostic (NULL_TREE, basetype, DK_PEDWARN);
12932 if (!dependent_type_p (basetype)
12933 && !complete_type_or_else (basetype, NULL))
12934 /* An incomplete type. Remove it from the list. */
12935 *basep = TREE_CHAIN (*basep);
12939 if (TREE_TYPE (*basep))
12941 if (CLASS_TYPE_P (basetype))
12942 max_vbases += vec_safe_length (CLASSTYPE_VBASECLASSES (basetype));
12943 basep = &TREE_CHAIN (*basep);
12946 max_vbases += max_dvbases;
12948 TYPE_MARKED_P (ref) = 1;
12950 /* The binfo slot should be empty, unless this is an (ill-formed)
12952 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
12954 error ("redefinition of %q#T", ref);
12958 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
12960 binfo = make_tree_binfo (max_bases);
12962 TYPE_BINFO (ref) = binfo;
12963 BINFO_OFFSET (binfo) = size_zero_node;
12964 BINFO_TYPE (binfo) = ref;
12966 /* Apply base-class info set up to the variants of this type. */
12967 fixup_type_variants (ref);
12971 vec_alloc (BINFO_BASE_ACCESSES (binfo), max_bases);
12972 /* An aggregate cannot have baseclasses. */
12973 CLASSTYPE_NON_AGGREGATE (ref) = 1;
12975 if (TREE_CODE (ref) == UNION_TYPE)
12977 error ("derived union %qT invalid", ref);
12984 if (TYPE_FOR_JAVA (ref))
12986 error ("Java class %qT cannot have multiple bases", ref);
12990 warning (OPT_Wmultiple_inheritance,
12991 "%qT defined with multiple direct bases", ref);
12996 vec_alloc (CLASSTYPE_VBASECLASSES (ref), max_vbases);
12998 if (TYPE_FOR_JAVA (ref))
13000 error ("Java class %qT cannot have virtual bases", ref);
13003 else if (max_dvbases)
13004 warning (OPT_Wvirtual_inheritance,
13005 "%qT defined with direct virtual base", ref);
13008 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
13010 tree access = TREE_PURPOSE (base_list);
13011 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
13012 tree basetype = TREE_VALUE (base_list);
13014 if (access == access_default_node)
13015 access = default_access;
13017 if (PACK_EXPANSION_P (basetype))
13018 basetype = PACK_EXPANSION_PATTERN (basetype);
13019 if (TREE_CODE (basetype) == TYPE_DECL)
13020 basetype = TREE_TYPE (basetype);
13021 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
13023 error ("base type %qT fails to be a struct or class type",
13028 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
13029 TYPE_FOR_JAVA (ref) = 1;
13031 base_binfo = NULL_TREE;
13032 if (CLASS_TYPE_P (basetype) && !dependent_scope_p (basetype))
13034 base_binfo = TYPE_BINFO (basetype);
13035 /* The original basetype could have been a typedef'd type. */
13036 basetype = BINFO_TYPE (base_binfo);
13038 /* Inherit flags from the base. */
13039 TYPE_HAS_NEW_OPERATOR (ref)
13040 |= TYPE_HAS_NEW_OPERATOR (basetype);
13041 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
13042 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
13043 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
13044 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
13045 CLASSTYPE_DIAMOND_SHAPED_P (ref)
13046 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
13047 CLASSTYPE_REPEATED_BASE_P (ref)
13048 |= CLASSTYPE_REPEATED_BASE_P (basetype);
13051 /* We must do this test after we've seen through a typedef
13053 if (TYPE_MARKED_P (basetype))
13055 if (basetype == ref)
13056 error ("recursive type %qT undefined", basetype);
13058 error ("duplicate base type %qT invalid", basetype);
13062 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
13063 /* Regenerate the pack expansion for the bases. */
13064 basetype = make_pack_expansion (basetype);
13066 TYPE_MARKED_P (basetype) = 1;
13068 base_binfo = copy_binfo (base_binfo, basetype, ref,
13069 &igo_prev, via_virtual);
13070 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
13071 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
13073 BINFO_BASE_APPEND (binfo, base_binfo);
13074 BINFO_BASE_ACCESS_APPEND (binfo, access);
13077 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref)) < max_vbases)
13078 /* If we didn't get max_vbases vbases, we must have shared at
13079 least one of them, and are therefore diamond shaped. */
13080 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
13082 /* Unmark all the types. */
13083 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
13084 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
13085 TYPE_MARKED_P (ref) = 0;
13087 /* Now see if we have a repeated base type. */
13088 if (!CLASSTYPE_REPEATED_BASE_P (ref))
13090 for (base_binfo = binfo; base_binfo;
13091 base_binfo = TREE_CHAIN (base_binfo))
13093 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
13095 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
13098 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
13100 for (base_binfo = binfo; base_binfo;
13101 base_binfo = TREE_CHAIN (base_binfo))
13102 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
13103 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
13112 /* Copies the enum-related properties from type SRC to type DST.
13113 Used with the underlying type of an enum and the enum itself. */
13115 copy_type_enum (tree dst, tree src)
13118 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
13120 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
13121 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
13122 TYPE_SIZE (t) = TYPE_SIZE (src);
13123 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
13124 SET_TYPE_MODE (dst, TYPE_MODE (src));
13125 TYPE_PRECISION (t) = TYPE_PRECISION (src);
13126 unsigned valign = TYPE_ALIGN (src);
13127 if (TYPE_USER_ALIGN (t))
13128 valign = MAX (valign, TYPE_ALIGN (t));
13130 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
13131 TYPE_ALIGN (t) = valign;
13132 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
13136 /* Begin compiling the definition of an enumeration type.
13139 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
13141 UNDERLYING_TYPE is the type that will be used as the storage for
13142 the enumeration type. This should be NULL_TREE if no storage type
13145 ATTRIBUTES are any attributes specified after the enum-key.
13147 SCOPED_ENUM_P is true if this is a scoped enumeration type.
13149 if IS_NEW is not NULL, gets TRUE iff a new type is created.
13151 Returns the type object, as yet incomplete.
13152 Also records info about it so that build_enumerator
13153 may be used to declare the individual values as they are read. */
13156 start_enum (tree name, tree enumtype, tree underlying_type,
13157 tree attributes, bool scoped_enum_p, bool *is_new)
13159 tree prevtype = NULL_TREE;
13160 gcc_assert (identifier_p (name));
13164 /* [C++0x dcl.enum]p5:
13166 If not explicitly specified, the underlying type of a scoped
13167 enumeration type is int. */
13168 if (!underlying_type && scoped_enum_p)
13169 underlying_type = integer_type_node;
13171 if (underlying_type)
13172 underlying_type = cv_unqualified (underlying_type);
13174 /* If this is the real definition for a previous forward reference,
13175 fill in the contents in the same object that used to be the
13176 forward reference. */
13178 enumtype = lookup_and_check_tag (enum_type, name,
13179 /*tag_scope=*/ts_current,
13180 /*template_header_p=*/false);
13182 /* In case of a template_decl, the only check that should be deferred
13183 to instantiation time is the comparison of underlying types. */
13184 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
13186 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
13188 error_at (input_location, "scoped/unscoped mismatch "
13189 "in enum %q#T", enumtype);
13190 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
13191 "previous definition here");
13192 enumtype = error_mark_node;
13194 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
13196 error_at (input_location, "underlying type mismatch "
13197 "in enum %q#T", enumtype);
13198 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
13199 "previous definition here");
13200 enumtype = error_mark_node;
13202 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
13203 && !dependent_type_p (underlying_type)
13204 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
13205 && !same_type_p (underlying_type,
13206 ENUM_UNDERLYING_TYPE (enumtype)))
13208 error_at (input_location, "different underlying type "
13209 "in enum %q#T", enumtype);
13210 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
13211 "previous definition here");
13212 underlying_type = NULL_TREE;
13216 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
13217 || processing_template_decl)
13219 /* In case of error, make a dummy enum to allow parsing to
13221 if (enumtype == error_mark_node)
13223 name = make_anon_name ();
13224 enumtype = NULL_TREE;
13227 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
13228 of an opaque enum, or an opaque enum of an already defined
13229 enumeration (C++0x only).
13230 In any other case, it'll be NULL_TREE. */
13236 prevtype = enumtype;
13238 /* Do not push the decl more than once, unless we need to
13239 compare underlying types at instantiation time */
13241 || TREE_CODE (enumtype) != ENUMERAL_TYPE
13242 || (underlying_type
13243 && dependent_type_p (underlying_type))
13244 || (ENUM_UNDERLYING_TYPE (enumtype)
13245 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
13247 enumtype = cxx_make_type (ENUMERAL_TYPE);
13248 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
13251 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
13254 if (enumtype == error_mark_node)
13255 return error_mark_node;
13257 /* The enum is considered opaque until the opening '{' of the
13258 enumerator list. */
13259 SET_OPAQUE_ENUM_P (enumtype, true);
13260 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
13263 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
13265 cplus_decl_attributes (&enumtype, attributes, (int)ATTR_FLAG_TYPE_IN_PLACE);
13267 if (underlying_type)
13269 if (ENUM_UNDERLYING_TYPE (enumtype))
13270 /* We already checked that it matches, don't change it to a different
13271 typedef variant. */;
13272 else if (CP_INTEGRAL_TYPE_P (underlying_type))
13274 copy_type_enum (enumtype, underlying_type);
13275 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
13277 else if (dependent_type_p (underlying_type))
13278 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
13280 error ("underlying type %<%T%> of %<%T%> must be an integral type",
13281 underlying_type, enumtype);
13284 /* If into a template class, the returned enum is always the first
13285 declaration (opaque or not) seen. This way all the references to
13286 this type will be to the same declaration. The following ones are used
13287 only to check for definition errors. */
13288 if (prevtype && processing_template_decl)
13294 /* After processing and defining all the values of an enumeration type,
13295 install their decls in the enumeration type.
13296 ENUMTYPE is the type object. */
13299 finish_enum_value_list (tree enumtype)
13302 tree underlying_type;
13305 tree minnode, maxnode;
13308 bool fixed_underlying_type_p
13309 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
13311 /* We built up the VALUES in reverse order. */
13312 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
13314 /* For an enum defined in a template, just set the type of the values;
13315 all further processing is postponed until the template is
13316 instantiated. We need to set the type so that tsubst of a CONST_DECL
13318 if (processing_template_decl)
13320 for (values = TYPE_VALUES (enumtype);
13322 values = TREE_CHAIN (values))
13323 TREE_TYPE (TREE_VALUE (values)) = enumtype;
13327 /* Determine the minimum and maximum values of the enumerators. */
13328 if (TYPE_VALUES (enumtype))
13330 minnode = maxnode = NULL_TREE;
13332 for (values = TYPE_VALUES (enumtype);
13334 values = TREE_CHAIN (values))
13336 decl = TREE_VALUE (values);
13338 /* [dcl.enum]: Following the closing brace of an enum-specifier,
13339 each enumerator has the type of its enumeration. Prior to the
13340 closing brace, the type of each enumerator is the type of its
13341 initializing value. */
13342 TREE_TYPE (decl) = enumtype;
13344 /* Update the minimum and maximum values, if appropriate. */
13345 value = DECL_INITIAL (decl);
13346 if (value == error_mark_node)
13347 value = integer_zero_node;
13348 /* Figure out what the minimum and maximum values of the
13349 enumerators are. */
13351 minnode = maxnode = value;
13352 else if (tree_int_cst_lt (maxnode, value))
13354 else if (tree_int_cst_lt (value, minnode))
13361 If the enumerator-list is empty, the underlying type is as if
13362 the enumeration had a single enumerator with value 0. */
13363 minnode = maxnode = integer_zero_node;
13365 if (!fixed_underlying_type_p)
13367 /* Compute the number of bits require to represent all values of the
13368 enumeration. We must do this before the type of MINNODE and
13369 MAXNODE are transformed, since tree_int_cst_min_precision relies
13370 on the TREE_TYPE of the value it is passed. */
13371 signop sgn = tree_int_cst_sgn (minnode) >= 0 ? UNSIGNED : SIGNED;
13372 int lowprec = tree_int_cst_min_precision (minnode, sgn);
13373 int highprec = tree_int_cst_min_precision (maxnode, sgn);
13374 int precision = MAX (lowprec, highprec);
13376 bool use_short_enum;
13378 /* Determine the underlying type of the enumeration.
13382 The underlying type of an enumeration is an integral type that
13383 can represent all the enumerator values defined in the
13384 enumeration. It is implementation-defined which integral type is
13385 used as the underlying type for an enumeration except that the
13386 underlying type shall not be larger than int unless the value of
13387 an enumerator cannot fit in an int or unsigned int.
13389 We use "int" or an "unsigned int" as the underlying type, even if
13390 a smaller integral type would work, unless the user has
13391 explicitly requested that we use the smallest possible type. The
13392 user can request that for all enumerations with a command line
13393 flag, or for just one enumeration with an attribute. */
13395 use_short_enum = flag_short_enums
13396 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
13398 /* If the precision of the type was specified with an attribute and it
13399 was too small, give an error. Otherwise, use it. */
13400 if (TYPE_PRECISION (enumtype))
13402 if (precision > TYPE_PRECISION (enumtype))
13403 error ("specified mode too small for enumeral values");
13406 use_short_enum = true;
13407 precision = TYPE_PRECISION (enumtype);
13411 for (itk = (use_short_enum ? itk_char : itk_int);
13415 underlying_type = integer_types[itk];
13416 if (underlying_type != NULL_TREE
13417 && TYPE_PRECISION (underlying_type) >= precision
13418 && TYPE_SIGN (underlying_type) == sgn)
13421 if (itk == itk_none)
13425 IF no integral type can represent all the enumerator values, the
13426 enumeration is ill-formed. */
13427 error ("no integral type can represent all of the enumerator values "
13428 "for %qT", enumtype);
13429 precision = TYPE_PRECISION (long_long_integer_type_node);
13430 underlying_type = integer_types[itk_unsigned_long_long];
13435 The value of sizeof() applied to an enumeration type, an object
13436 of an enumeration type, or an enumerator, is the value of sizeof()
13437 applied to the underlying type. */
13438 copy_type_enum (enumtype, underlying_type);
13440 /* Compute the minimum and maximum values for the type.
13444 For an enumeration where emin is the smallest enumerator and emax
13445 is the largest, the values of the enumeration are the values of the
13446 underlying type in the range bmin to bmax, where bmin and bmax are,
13447 respectively, the smallest and largest values of the smallest bit-
13448 field that can store emin and emax. */
13450 /* The middle-end currently assumes that types with TYPE_PRECISION
13451 narrower than their underlying type are suitably zero or sign
13452 extended to fill their mode. Similarly, it assumes that the front
13453 end assures that a value of a particular type must be within
13454 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
13456 We used to set these fields based on bmin and bmax, but that led
13457 to invalid assumptions like optimizing away bounds checking. So
13458 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
13459 TYPE_MAX_VALUE to the values for the mode above and only restrict
13460 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
13461 ENUM_UNDERLYING_TYPE (enumtype)
13462 = build_distinct_type_copy (underlying_type);
13463 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
13464 set_min_and_max_values_for_integral_type
13465 (ENUM_UNDERLYING_TYPE (enumtype), precision, sgn);
13467 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
13468 if (flag_strict_enums)
13469 set_min_and_max_values_for_integral_type (enumtype, precision, sgn);
13472 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
13474 /* Convert each of the enumerators to the type of the underlying
13475 type of the enumeration. */
13476 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
13478 location_t saved_location;
13480 decl = TREE_VALUE (values);
13481 saved_location = input_location;
13482 input_location = DECL_SOURCE_LOCATION (decl);
13483 if (fixed_underlying_type_p)
13484 /* If the enumeration type has a fixed underlying type, we
13485 already checked all of the enumerator values. */
13486 value = DECL_INITIAL (decl);
13488 value = perform_implicit_conversion (underlying_type,
13489 DECL_INITIAL (decl),
13490 tf_warning_or_error);
13491 input_location = saved_location;
13493 /* Do not clobber shared ints. */
13494 value = copy_node (value);
13496 TREE_TYPE (value) = enumtype;
13497 DECL_INITIAL (decl) = value;
13500 /* Fix up all variant types of this enum type. */
13501 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
13502 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
13504 if (at_class_scope_p ()
13505 && COMPLETE_TYPE_P (current_class_type)
13506 && UNSCOPED_ENUM_P (enumtype))
13508 insert_late_enum_def_into_classtype_sorted_fields (enumtype,
13509 current_class_type);
13510 fixup_type_variants (current_class_type);
13513 /* Finish debugging output for this type. */
13514 rest_of_type_compilation (enumtype, namespace_bindings_p ());
13516 /* Each enumerator now has the type of its enumeration. Clear the cache
13517 so that this change in types doesn't confuse us later on. */
13518 clear_cv_and_fold_caches ();
13521 /* Finishes the enum type. This is called only the first time an
13522 enumeration is seen, be it opaque or odinary.
13523 ENUMTYPE is the type object. */
13526 finish_enum (tree enumtype)
13528 if (processing_template_decl)
13530 if (at_function_scope_p ())
13531 add_stmt (build_min (TAG_DEFN, enumtype));
13535 /* If this is a forward declaration, there should not be any variants,
13536 though we can get a variant in the middle of an enum-specifier with
13537 wacky code like 'enum E { e = sizeof(const E*) };' */
13538 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
13539 && (TYPE_VALUES (enumtype)
13540 || !TYPE_NEXT_VARIANT (enumtype)));
13543 /* Build and install a CONST_DECL for an enumeration constant of the
13544 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
13545 Apply ATTRIBUTES if available. LOC is the location of NAME.
13546 Assignment of sequential values by default is handled here. */
13549 build_enumerator (tree name, tree value, tree enumtype, tree attributes,
13556 /* scalar_constant_value will pull out this expression, so make sure
13557 it's folded as appropriate. */
13558 if (processing_template_decl)
13559 value = fold_non_dependent_expr (value);
13561 /* If the VALUE was erroneous, pretend it wasn't there; that will
13562 result in the enum being assigned the next value in sequence. */
13563 if (value == error_mark_node)
13566 /* Remove no-op casts from the value. */
13568 STRIP_TYPE_NOPS (value);
13570 if (! processing_template_decl)
13572 /* Validate and default VALUE. */
13573 if (value != NULL_TREE)
13575 if (!ENUM_UNDERLYING_TYPE (enumtype))
13577 tree tmp_value = build_expr_type_conversion (WANT_INT | WANT_ENUM,
13582 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
13583 (TREE_TYPE (value)))
13584 value = perform_implicit_conversion_flags
13585 (ENUM_UNDERLYING_TYPE (enumtype), value, tf_warning_or_error,
13586 LOOKUP_IMPLICIT | LOOKUP_NO_NARROWING);
13588 if (value == error_mark_node)
13591 if (value != NULL_TREE)
13593 value = cxx_constant_value (value);
13595 if (TREE_CODE (value) != INTEGER_CST
13596 || ! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
13598 error ("enumerator value for %qD is not an integer constant",
13605 /* Default based on previous value. */
13606 if (value == NULL_TREE)
13608 if (TYPE_VALUES (enumtype))
13613 /* C++03 7.2/4: If no initializer is specified for the first
13614 enumerator, the type is an unspecified integral
13615 type. Otherwise the type is the same as the type of the
13616 initializing value of the preceding enumerator unless the
13617 incremented value is not representable in that type, in
13618 which case the type is an unspecified integral type
13619 sufficient to contain the incremented value. */
13620 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
13621 if (error_operand_p (prev_value))
13622 value = error_mark_node;
13625 tree type = TREE_TYPE (prev_value);
13626 signop sgn = TYPE_SIGN (type);
13627 widest_int wi = wi::add (wi::to_widest (prev_value), 1, sgn,
13631 bool pos = !wi::neg_p (wi, sgn);
13632 if (!wi::fits_to_tree_p (wi, type))
13635 for (itk = itk_int; itk != itk_none; itk++)
13637 type = integer_types[itk];
13638 if (type != NULL_TREE
13639 && (pos || !TYPE_UNSIGNED (type))
13640 && wi::fits_to_tree_p (wi, type))
13643 if (type && cxx_dialect < cxx11
13644 && itk > itk_unsigned_long)
13645 pedwarn (input_location, OPT_Wlong_long, pos ? "\
13646 incremented enumerator value is too large for %<unsigned long%>" : "\
13647 incremented enumerator value is too large for %<long%>");
13649 if (type == NULL_TREE)
13652 value = wide_int_to_tree (type, wi);
13657 error ("overflow in enumeration values at %qD", name);
13658 value = error_mark_node;
13663 value = integer_zero_node;
13666 /* Remove no-op casts from the value. */
13667 STRIP_TYPE_NOPS (value);
13669 /* If the underlying type of the enum is fixed, check whether
13670 the enumerator values fits in the underlying type. If it
13671 does not fit, the program is ill-formed [C++0x dcl.enum]. */
13672 if (ENUM_UNDERLYING_TYPE (enumtype)
13674 && TREE_CODE (value) == INTEGER_CST)
13676 if (!int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
13677 error ("enumerator value %E is outside the range of underlying "
13678 "type %<%T%>", value, ENUM_UNDERLYING_TYPE (enumtype));
13680 /* Convert the value to the appropriate type. */
13681 value = fold_convert (ENUM_UNDERLYING_TYPE (enumtype), value);
13685 /* C++ associates enums with global, function, or class declarations. */
13686 context = current_scope ();
13688 /* Build the actual enumeration constant. Note that the enumeration
13689 constants have the underlying type of the enum (if it is fixed)
13690 or the type of their initializer (if the underlying type of the
13691 enum is not fixed):
13695 If the underlying type is fixed, the type of each enumerator
13696 prior to the closing brace is the underlying type; if the
13697 initializing value of an enumerator cannot be represented by
13698 the underlying type, the program is ill-formed. If the
13699 underlying type is not fixed, the type of each enumerator is
13700 the type of its initializing value.
13702 If the underlying type is not fixed, it will be computed by
13703 finish_enum and we will reset the type of this enumerator. Of
13704 course, if we're processing a template, there may be no value. */
13705 type = value ? TREE_TYPE (value) : NULL_TREE;
13707 decl = build_decl (loc, CONST_DECL, name, type);
13709 DECL_CONTEXT (decl) = enumtype;
13710 TREE_CONSTANT (decl) = 1;
13711 TREE_READONLY (decl) = 1;
13712 DECL_INITIAL (decl) = value;
13715 cplus_decl_attributes (&decl, attributes, 0);
13717 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
13718 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
13719 on the TYPE_FIELDS list for `S'. (That's so that you can say
13720 things like `S::i' later.) */
13721 finish_member_declaration (decl);
13725 /* Add this enumeration constant to the list for this type. */
13726 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
13729 /* Look for an enumerator with the given NAME within the enumeration
13730 type ENUMTYPE. This routine is used primarily for qualified name
13731 lookup into an enumerator in C++0x, e.g.,
13733 enum class Color { Red, Green, Blue };
13735 Color color = Color::Red;
13737 Returns the value corresponding to the enumerator, or
13738 NULL_TREE if no such enumerator was found. */
13740 lookup_enumerator (tree enumtype, tree name)
13743 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
13745 e = purpose_member (name, TYPE_VALUES (enumtype));
13746 return e? TREE_VALUE (e) : NULL_TREE;
13750 /* We're defining DECL. Make sure that its type is OK. */
13753 check_function_type (tree decl, tree current_function_parms)
13755 tree fntype = TREE_TYPE (decl);
13756 tree return_type = complete_type (TREE_TYPE (fntype));
13758 /* In a function definition, arg types must be complete. */
13759 require_complete_types_for_parms (current_function_parms);
13761 if (dependent_type_p (return_type)
13762 || type_uses_auto (return_type))
13764 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
13765 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
13767 tree args = TYPE_ARG_TYPES (fntype);
13769 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
13770 error ("return type %q#T is incomplete", return_type);
13772 error ("return type has Java class type %q#T", return_type);
13774 /* Make it return void instead. */
13775 if (TREE_CODE (fntype) == METHOD_TYPE)
13776 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
13778 TREE_CHAIN (args));
13780 fntype = build_function_type (void_type_node, args);
13782 = build_exception_variant (fntype,
13783 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
13784 fntype = (cp_build_type_attribute_variant
13785 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
13786 TREE_TYPE (decl) = fntype;
13789 abstract_virtuals_error (decl, TREE_TYPE (fntype));
13792 /* True iff FN is an implicitly-defined default constructor. */
13795 implicit_default_ctor_p (tree fn)
13797 return (DECL_CONSTRUCTOR_P (fn)
13798 && !user_provided_p (fn)
13799 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn)));
13802 /* Clobber the contents of *this to let the back end know that the object
13803 storage is dead when we enter the constructor or leave the destructor. */
13806 build_clobber_this ()
13808 /* Clobbering an empty base is pointless, and harmful if its one byte
13809 TYPE_SIZE overlays real data. */
13810 if (is_empty_class (current_class_type))
13813 /* If we have virtual bases, clobber the whole object, but only if we're in
13814 charge. If we don't have virtual bases, clobber the as-base type so we
13815 don't mess with tail padding. */
13816 bool vbases = CLASSTYPE_VBASECLASSES (current_class_type);
13818 tree ctype = current_class_type;
13820 ctype = CLASSTYPE_AS_BASE (ctype);
13822 tree clobber = build_constructor (ctype, NULL);
13823 TREE_THIS_VOLATILE (clobber) = true;
13825 tree thisref = current_class_ref;
13826 if (ctype != current_class_type)
13828 thisref = build_nop (build_reference_type (ctype), current_class_ptr);
13829 thisref = convert_from_reference (thisref);
13832 tree exprstmt = build2 (MODIFY_EXPR, void_type_node, thisref, clobber);
13834 exprstmt = build_if_in_charge (exprstmt);
13839 /* Create the FUNCTION_DECL for a function definition.
13840 DECLSPECS and DECLARATOR are the parts of the declaration;
13841 they describe the function's name and the type it returns,
13842 but twisted together in a fashion that parallels the syntax of C.
13844 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
13845 DECLARATOR is really the DECL for the function we are about to
13846 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
13847 indicating that the function is an inline defined in-class.
13849 This function creates a binding context for the function body
13850 as well as setting up the FUNCTION_DECL in current_function_decl.
13852 For C++, we must first check whether that datum makes any sense.
13853 For example, "class A local_a(1,2);" means that variable local_a
13854 is an aggregate of type A, which should have a constructor
13855 applied to it with the argument list [1, 2].
13857 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
13858 or may be a BLOCK if the function has been defined previously
13859 in this translation unit. On exit, DECL_INITIAL (decl1) will be
13860 error_mark_node if the function has never been defined, or
13861 a BLOCK if the function has been defined somewhere. */
13864 start_preparsed_function (tree decl1, tree attrs, int flags)
13866 tree ctype = NULL_TREE;
13869 int doing_friend = 0;
13870 cp_binding_level *bl;
13871 tree current_function_parms;
13872 struct c_fileinfo *finfo
13873 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
13874 bool honor_interface;
13876 /* Sanity check. */
13877 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node)));
13878 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
13880 fntype = TREE_TYPE (decl1);
13881 if (TREE_CODE (fntype) == METHOD_TYPE)
13882 ctype = TYPE_METHOD_BASETYPE (fntype);
13884 /* ISO C++ 11.4/5. A friend function defined in a class is in
13885 the (lexical) scope of the class in which it is defined. */
13886 if (!ctype && DECL_FRIEND_P (decl1))
13888 ctype = DECL_FRIEND_CONTEXT (decl1);
13890 /* CTYPE could be null here if we're dealing with a template;
13891 for example, `inline friend float foo()' inside a template
13892 will have no CTYPE set. */
13893 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
13899 if (DECL_DECLARED_INLINE_P (decl1)
13900 && lookup_attribute ("noinline", attrs))
13901 warning_at (DECL_SOURCE_LOCATION (decl1), 0,
13902 "inline function %qD given attribute noinline", decl1);
13904 /* Handle gnu_inline attribute. */
13905 if (GNU_INLINE_P (decl1))
13907 DECL_EXTERNAL (decl1) = 1;
13908 DECL_NOT_REALLY_EXTERN (decl1) = 0;
13909 DECL_INTERFACE_KNOWN (decl1) = 1;
13910 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
13913 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
13914 /* This is a constructor, we must ensure that any default args
13915 introduced by this definition are propagated to the clones
13916 now. The clones are used directly in overload resolution. */
13917 adjust_clone_args (decl1);
13919 /* Sometimes we don't notice that a function is a static member, and
13920 build a METHOD_TYPE for it. Fix that up now. */
13921 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
13922 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
13924 /* Set up current_class_type, and enter the scope of the class, if
13927 push_nested_class (ctype);
13928 else if (DECL_STATIC_FUNCTION_P (decl1))
13929 push_nested_class (DECL_CONTEXT (decl1));
13931 /* Now that we have entered the scope of the class, we must restore
13932 the bindings for any template parameters surrounding DECL1, if it
13933 is an inline member template. (Order is important; consider the
13934 case where a template parameter has the same name as a field of
13935 the class.) It is not until after this point that
13936 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
13937 if (flags & SF_INCLASS_INLINE)
13938 maybe_begin_member_template_processing (decl1);
13940 /* Effective C++ rule 15. */
13942 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
13943 && VOID_TYPE_P (TREE_TYPE (fntype)))
13944 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
13946 /* Make the init_value nonzero so pushdecl knows this is not tentative.
13947 error_mark_node is replaced below (in poplevel) with the BLOCK. */
13948 if (!DECL_INITIAL (decl1))
13949 DECL_INITIAL (decl1) = error_mark_node;
13951 /* This function exists in static storage.
13952 (This does not mean `static' in the C sense!) */
13953 TREE_STATIC (decl1) = 1;
13955 /* We must call push_template_decl after current_class_type is set
13956 up. (If we are processing inline definitions after exiting a
13957 class scope, current_class_type will be NULL_TREE until set above
13958 by push_nested_class.) */
13959 if (processing_template_decl)
13961 tree newdecl1 = push_template_decl (decl1);
13962 if (newdecl1 == error_mark_node)
13964 if (ctype || DECL_STATIC_FUNCTION_P (decl1))
13965 pop_nested_class ();
13971 /* We are now in the scope of the function being defined. */
13972 current_function_decl = decl1;
13974 /* Save the parm names or decls from this function's declarator
13975 where store_parm_decls will find them. */
13976 current_function_parms = DECL_ARGUMENTS (decl1);
13978 /* Make sure the parameter and return types are reasonable. When
13979 you declare a function, these types can be incomplete, but they
13980 must be complete when you define the function. */
13981 check_function_type (decl1, current_function_parms);
13983 /* Build the return declaration for the function. */
13984 restype = TREE_TYPE (fntype);
13986 if (DECL_RESULT (decl1) == NULL_TREE)
13990 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
13991 DECL_ARTIFICIAL (resdecl) = 1;
13992 DECL_IGNORED_P (resdecl) = 1;
13993 DECL_RESULT (decl1) = resdecl;
13995 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
13998 /* Let the user know we're compiling this function. */
13999 announce_function (decl1);
14001 /* Record the decl so that the function name is defined.
14002 If we already have a decl for this name, and it is a FUNCTION_DECL,
14003 use the old decl. */
14004 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
14006 /* A specialization is not used to guide overload resolution. */
14007 if (!DECL_FUNCTION_MEMBER_P (decl1)
14008 && !(DECL_USE_TEMPLATE (decl1) &&
14009 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
14011 tree olddecl = pushdecl (decl1);
14013 if (olddecl == error_mark_node)
14014 /* If something went wrong when registering the declaration,
14015 use DECL1; we have to have a FUNCTION_DECL to use when
14016 parsing the body of the function. */
14020 /* Otherwise, OLDDECL is either a previous declaration
14021 of the same function or DECL1 itself. */
14023 if (warn_missing_declarations
14024 && olddecl == decl1
14025 && !DECL_MAIN_P (decl1)
14026 && TREE_PUBLIC (decl1)
14027 && !DECL_DECLARED_INLINE_P (decl1))
14031 /* Check whether DECL1 is in an anonymous
14033 for (context = DECL_CONTEXT (decl1);
14035 context = DECL_CONTEXT (context))
14037 if (TREE_CODE (context) == NAMESPACE_DECL
14038 && DECL_NAME (context) == NULL_TREE)
14042 if (context == NULL)
14043 warning_at (DECL_SOURCE_LOCATION (decl1),
14044 OPT_Wmissing_declarations,
14045 "no previous declaration for %qD", decl1);
14053 /* We need to set the DECL_CONTEXT. */
14054 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
14055 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
14057 fntype = TREE_TYPE (decl1);
14058 restype = TREE_TYPE (fntype);
14060 /* If #pragma weak applies, mark the decl appropriately now.
14061 The pragma only applies to global functions. Because
14062 determining whether or not the #pragma applies involves
14063 computing the mangled name for the declaration, we cannot
14064 apply the pragma until after we have merged this declaration
14065 with any previous declarations; if the original declaration
14066 has a linkage specification, that specification applies to
14067 the definition as well, and may affect the mangled name. */
14068 if (DECL_FILE_SCOPE_P (decl1))
14069 maybe_apply_pragma_weak (decl1);
14072 /* Reset this in case the call to pushdecl changed it. */
14073 current_function_decl = decl1;
14075 gcc_assert (DECL_INITIAL (decl1));
14077 /* This function may already have been parsed, in which case just
14078 return; our caller will skip over the body without parsing. */
14079 if (DECL_INITIAL (decl1) != error_mark_node)
14082 /* Initialize RTL machinery. We cannot do this until
14083 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
14084 even when processing a template; this is how we get
14085 CFUN set up, and our per-function variables initialized.
14086 FIXME factor out the non-RTL stuff. */
14087 bl = current_binding_level;
14088 allocate_struct_function (decl1, processing_template_decl);
14090 /* Initialize the language data structures. Whenever we start
14091 a new function, we destroy temporaries in the usual way. */
14092 cfun->language = ggc_cleared_alloc<language_function> ();
14093 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
14094 current_binding_level = bl;
14096 if (!processing_template_decl && type_uses_auto (restype))
14098 FNDECL_USED_AUTO (decl1) = true;
14099 current_function_auto_return_pattern = restype;
14102 /* Start the statement-tree, start the tree now. */
14103 DECL_SAVED_TREE (decl1) = push_stmt_list ();
14105 /* If we are (erroneously) defining a function that we have already
14106 defined before, wipe out what we knew before. */
14107 if (!DECL_PENDING_INLINE_P (decl1))
14108 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
14110 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
14112 /* We know that this was set up by `grokclassfn'. We do not
14113 wait until `store_parm_decls', since evil parse errors may
14114 never get us to that point. Here we keep the consistency
14115 between `current_class_type' and `current_class_ptr'. */
14116 tree t = DECL_ARGUMENTS (decl1);
14118 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
14119 gcc_assert (TYPE_PTR_P (TREE_TYPE (t)));
14121 cp_function_chain->x_current_class_ref
14122 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
14123 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
14124 cp_function_chain->x_current_class_ptr = t;
14126 /* Constructors and destructors need to know whether they're "in
14127 charge" of initializing virtual base classes. */
14128 t = DECL_CHAIN (t);
14129 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
14131 current_in_charge_parm = t;
14132 t = DECL_CHAIN (t);
14134 if (DECL_HAS_VTT_PARM_P (decl1))
14136 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
14137 current_vtt_parm = t;
14141 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
14142 /* Implicitly-defined methods (like the
14143 destructor for a class in which no destructor
14144 is explicitly declared) must not be defined
14145 until their definition is needed. So, we
14146 ignore interface specifications for
14147 compiler-generated functions. */
14148 && !DECL_ARTIFICIAL (decl1));
14150 if (processing_template_decl)
14151 /* Don't mess with interface flags. */;
14152 else if (DECL_INTERFACE_KNOWN (decl1))
14154 tree ctx = decl_function_context (decl1);
14156 if (DECL_NOT_REALLY_EXTERN (decl1))
14157 DECL_EXTERNAL (decl1) = 0;
14159 if (ctx != NULL_TREE && vague_linkage_p (ctx))
14160 /* This is a function in a local class in an extern inline
14161 or template function. */
14162 comdat_linkage (decl1);
14164 /* If this function belongs to an interface, it is public.
14165 If it belongs to someone else's interface, it is also external.
14166 This only affects inlines and template instantiations. */
14167 else if (!finfo->interface_unknown && honor_interface)
14169 if (DECL_DECLARED_INLINE_P (decl1)
14170 || DECL_TEMPLATE_INSTANTIATION (decl1))
14172 DECL_EXTERNAL (decl1)
14173 = (finfo->interface_only
14174 || (DECL_DECLARED_INLINE_P (decl1)
14175 && ! flag_implement_inlines
14176 && !DECL_VINDEX (decl1)));
14178 /* For WIN32 we also want to put these in linkonce sections. */
14179 maybe_make_one_only (decl1);
14182 DECL_EXTERNAL (decl1) = 0;
14183 DECL_INTERFACE_KNOWN (decl1) = 1;
14184 /* If this function is in an interface implemented in this file,
14185 make sure that the back end knows to emit this function
14187 if (!DECL_EXTERNAL (decl1))
14188 mark_needed (decl1);
14190 else if (finfo->interface_unknown && finfo->interface_only
14191 && honor_interface)
14193 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
14194 interface, we will have both finfo->interface_unknown and
14195 finfo->interface_only set. In that case, we don't want to
14196 use the normal heuristics because someone will supply a
14197 #pragma implementation elsewhere, and deducing it here would
14198 produce a conflict. */
14199 comdat_linkage (decl1);
14200 DECL_EXTERNAL (decl1) = 0;
14201 DECL_INTERFACE_KNOWN (decl1) = 1;
14202 DECL_DEFER_OUTPUT (decl1) = 1;
14206 /* This is a definition, not a reference.
14207 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
14208 if (!GNU_INLINE_P (decl1))
14209 DECL_EXTERNAL (decl1) = 0;
14211 if ((DECL_DECLARED_INLINE_P (decl1)
14212 || DECL_TEMPLATE_INSTANTIATION (decl1))
14213 && ! DECL_INTERFACE_KNOWN (decl1))
14214 DECL_DEFER_OUTPUT (decl1) = 1;
14216 DECL_INTERFACE_KNOWN (decl1) = 1;
14219 /* Determine the ELF visibility attribute for the function. We must not
14220 do this before calling "pushdecl", as we must allow "duplicate_decls"
14221 to merge any attributes appropriately. We also need to wait until
14223 if (!DECL_CLONED_FUNCTION_P (decl1))
14224 determine_visibility (decl1);
14226 if (!processing_template_decl)
14227 maybe_instantiate_noexcept (decl1);
14229 begin_scope (sk_function_parms, decl1);
14233 if (DECL_DESTRUCTOR_P (decl1)
14234 || (DECL_CONSTRUCTOR_P (decl1)
14235 && targetm.cxx.cdtor_returns_this ()))
14236 cdtor_label = create_artificial_label (input_location);
14238 start_fname_decls ();
14240 store_parm_decls (current_function_parms);
14242 if (!processing_template_decl
14243 && (flag_lifetime_dse > 1)
14244 && DECL_CONSTRUCTOR_P (decl1)
14245 && !DECL_CLONED_FUNCTION_P (decl1)
14246 /* Clobbering an empty base is harmful if it overlays real data. */
14247 && !is_empty_class (current_class_type)
14248 /* We can't clobber safely for an implicitly-defined default constructor
14249 because part of the initialization might happen before we enter the
14250 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
14251 && !implicit_default_ctor_p (decl1))
14252 finish_expr_stmt (build_clobber_this ());
14254 if (!processing_template_decl
14255 && DECL_CONSTRUCTOR_P (decl1)
14256 && (flag_sanitize & SANITIZE_VPTR)
14257 && !DECL_CLONED_FUNCTION_P (decl1)
14258 && !implicit_default_ctor_p (decl1))
14259 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr);
14265 /* Like start_preparsed_function, except that instead of a
14266 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
14268 Returns true on success. If the DECLARATOR is not suitable
14269 for a function, we return false, which tells the parser to
14270 skip the entire function. */
14273 start_function (cp_decl_specifier_seq *declspecs,
14274 const cp_declarator *declarator,
14279 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
14280 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION, decl1);
14281 if (decl1 == error_mark_node)
14283 /* If the declarator is not suitable for a function definition,
14284 cause a syntax error. */
14285 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
14287 error ("invalid function declaration");
14291 if (DECL_MAIN_P (decl1))
14292 /* main must return int. grokfndecl should have corrected it
14293 (and issued a diagnostic) if the user got it wrong. */
14294 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
14295 integer_type_node));
14297 return start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
14300 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
14304 use_eh_spec_block (tree fn)
14306 return (flag_exceptions && flag_enforce_eh_specs
14307 && !processing_template_decl
14308 && !type_throw_all_p (TREE_TYPE (fn))
14309 /* We insert the EH_SPEC_BLOCK only in the original
14310 function; then, it is copied automatically to the
14312 && !DECL_CLONED_FUNCTION_P (fn)
14313 /* Implicitly-generated constructors and destructors have
14314 exception specifications. However, those specifications
14315 are the union of the possible exceptions specified by the
14316 constructors/destructors for bases and members, so no
14317 unallowed exception will ever reach this function. By
14318 not creating the EH_SPEC_BLOCK we save a little memory,
14319 and we avoid spurious warnings about unreachable
14321 && !DECL_DEFAULTED_FN (fn));
14324 /* Store the parameter declarations into the current function declaration.
14325 This is called after parsing the parameter declarations, before
14326 digesting the body of the function.
14328 Also install to binding contour return value identifier, if any. */
14331 store_parm_decls (tree current_function_parms)
14333 tree fndecl = current_function_decl;
14336 /* This is a chain of any other decls that came in among the parm
14337 declarations. If a parm is declared with enum {foo, bar} x;
14338 then CONST_DECLs for foo and bar are put here. */
14339 tree nonparms = NULL_TREE;
14341 if (current_function_parms)
14343 /* This case is when the function was defined with an ANSI prototype.
14344 The parms already have decls, so we need not do anything here
14345 except record them as in effect
14346 and complain if any redundant old-style parm decls were written. */
14348 tree specparms = current_function_parms;
14351 /* Must clear this because it might contain TYPE_DECLs declared
14353 current_binding_level->names = NULL;
14355 /* If we're doing semantic analysis, then we'll call pushdecl
14356 for each of these. We must do them in reverse order so that
14357 they end in the correct forward order. */
14358 specparms = nreverse (specparms);
14360 for (parm = specparms; parm; parm = next)
14362 next = DECL_CHAIN (parm);
14363 if (TREE_CODE (parm) == PARM_DECL)
14365 if (DECL_NAME (parm) == NULL_TREE
14366 || !VOID_TYPE_P (parm))
14369 error ("parameter %qD declared void", parm);
14373 /* If we find an enum constant or a type tag,
14374 put it aside for the moment. */
14375 TREE_CHAIN (parm) = NULL_TREE;
14376 nonparms = chainon (nonparms, parm);
14380 /* Get the decls in their original chain order and record in the
14381 function. This is all and only the PARM_DECLs that were
14382 pushed into scope by the loop above. */
14383 DECL_ARGUMENTS (fndecl) = getdecls ();
14386 DECL_ARGUMENTS (fndecl) = NULL_TREE;
14388 /* Now store the final chain of decls for the arguments
14389 as the decl-chain of the current lexical scope.
14390 Put the enumerators in as well, at the front so that
14391 DECL_ARGUMENTS is not modified. */
14392 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
14394 if (use_eh_spec_block (current_function_decl))
14395 current_eh_spec_block = begin_eh_spec_block ();
14399 /* We have finished doing semantic analysis on DECL, but have not yet
14400 generated RTL for its body. Save away our current state, so that
14401 when we want to generate RTL later we know what to do. */
14404 save_function_data (tree decl)
14406 struct language_function *f;
14408 /* Save the language-specific per-function data so that we can
14409 get it back when we really expand this function. */
14410 gcc_assert (!DECL_PENDING_INLINE_P (decl));
14413 f = ggc_alloc<language_function> ();
14414 memcpy (f, cp_function_chain, sizeof (struct language_function));
14415 DECL_SAVED_FUNCTION_DATA (decl) = f;
14417 /* Clear out the bits we don't need. */
14418 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
14419 f->bindings = NULL;
14420 f->x_local_names = NULL;
14421 f->base.local_typedefs = NULL;
14425 /* Set the return value of the constructor (if present). */
14428 finish_constructor_body (void)
14433 if (targetm.cxx.cdtor_returns_this ()
14434 && (! TYPE_FOR_JAVA (current_class_type)))
14436 /* Any return from a constructor will end up here. */
14437 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
14439 val = DECL_ARGUMENTS (current_function_decl);
14440 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
14441 DECL_RESULT (current_function_decl), val);
14442 /* Return the address of the object. */
14443 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
14444 add_stmt (exprstmt);
14448 /* Do all the processing for the beginning of a destructor; set up the
14449 vtable pointers and cleanups for bases and members. */
14452 begin_destructor_body (void)
14454 tree compound_stmt;
14456 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
14457 issued an error message. We still want to try to process the
14458 body of the function, but initialize_vtbl_ptrs will crash if
14459 TYPE_BINFO is NULL. */
14460 if (COMPLETE_TYPE_P (current_class_type))
14462 compound_stmt = begin_compound_stmt (0);
14463 /* Make all virtual function table pointers in non-virtual base
14464 classes point to CURRENT_CLASS_TYPE's virtual function
14466 initialize_vtbl_ptrs (current_class_ptr);
14467 finish_compound_stmt (compound_stmt);
14469 if (flag_lifetime_dse
14470 /* Clobbering an empty base is harmful if it overlays real data. */
14471 && !is_empty_class (current_class_type))
14472 finish_decl_cleanup (NULL_TREE, build_clobber_this ());
14474 /* And insert cleanups for our bases and members so that they
14475 will be properly destroyed if we throw. */
14476 push_base_cleanups ();
14480 /* At the end of every destructor we generate code to delete the object if
14481 necessary. Do that now. */
14484 finish_destructor_body (void)
14488 /* Any return from a destructor will end up here; that way all base
14489 and member cleanups will be run when the function returns. */
14490 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
14492 if (targetm.cxx.cdtor_returns_this ())
14496 val = DECL_ARGUMENTS (current_function_decl);
14497 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
14498 DECL_RESULT (current_function_decl), val);
14499 /* Return the address of the object. */
14500 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
14501 add_stmt (exprstmt);
14505 /* Do the necessary processing for the beginning of a function body, which
14506 in this case includes member-initializers, but not the catch clauses of
14507 a function-try-block. Currently, this means opening a binding level
14508 for the member-initializers (in a ctor), member cleanups (in a dtor),
14509 and capture proxies (in a lambda operator()). */
14512 begin_function_body (void)
14516 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
14519 if (processing_template_decl)
14520 /* Do nothing now. */;
14522 /* Always keep the BLOCK node associated with the outermost pair of
14523 curly braces of a function. These are needed for correct
14524 operation of dwarfout.c. */
14525 keep_next_level (true);
14527 stmt = begin_compound_stmt (BCS_FN_BODY);
14529 if (processing_template_decl)
14530 /* Do nothing now. */;
14531 else if (DECL_DESTRUCTOR_P (current_function_decl))
14532 begin_destructor_body ();
14537 /* Do the processing for the end of a function body. Currently, this means
14538 closing out the cleanups for fully-constructed bases and members, and in
14539 the case of the destructor, deleting the object if desired. Again, this
14540 is only meaningful for [cd]tors, since they are the only functions where
14541 there is a significant distinction between the main body and any
14542 function catch clauses. Handling, say, main() return semantics here
14543 would be wrong, as flowing off the end of a function catch clause for
14544 main() would also need to return 0. */
14547 finish_function_body (tree compstmt)
14549 if (compstmt == NULL_TREE)
14552 /* Close the block. */
14553 finish_compound_stmt (compstmt);
14555 if (processing_template_decl)
14556 /* Do nothing now. */;
14557 else if (DECL_CONSTRUCTOR_P (current_function_decl))
14558 finish_constructor_body ();
14559 else if (DECL_DESTRUCTOR_P (current_function_decl))
14560 finish_destructor_body ();
14563 /* Given a function, returns the BLOCK corresponding to the outermost level
14564 of curly braces, skipping the artificial block created for constructor
14568 outer_curly_brace_block (tree fndecl)
14570 tree block = DECL_INITIAL (fndecl);
14571 if (BLOCK_OUTER_CURLY_BRACE_P (block))
14573 block = BLOCK_SUBBLOCKS (block);
14574 if (BLOCK_OUTER_CURLY_BRACE_P (block))
14576 block = BLOCK_SUBBLOCKS (block);
14577 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block));
14581 /* If FNDECL is a class's key method, add the class to the list of
14582 keyed classes that should be emitted. */
14585 record_key_method_defined (tree fndecl)
14587 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
14588 && DECL_VIRTUAL_P (fndecl)
14589 && !processing_template_decl)
14591 tree fnclass = DECL_CONTEXT (fndecl);
14592 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
14593 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
14597 /* Subroutine of finish_function.
14598 Save the body of constexpr functions for possible
14599 future compile time evaluation. */
14602 maybe_save_function_definition (tree fun)
14604 if (!processing_template_decl
14605 && DECL_DECLARED_CONSTEXPR_P (fun)
14606 && !cp_function_chain->invalid_constexpr
14607 && !DECL_CLONED_FUNCTION_P (fun))
14608 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
14611 /* Finish up a function declaration and compile that function
14612 all the way to assembler language output. The free the storage
14613 for the function definition.
14615 FLAGS is a bitwise or of the following values:
14617 We just finished processing the body of an in-class inline
14618 function definition. (This processing will have taken place
14619 after the class definition is complete.) */
14622 finish_function (int flags)
14624 tree fndecl = current_function_decl;
14625 tree fntype, ctype = NULL_TREE;
14626 int inclass_inline = (flags & 2) != 0;
14628 /* When we get some parse errors, we can end up without a
14629 current_function_decl, so cope. */
14630 if (fndecl == NULL_TREE)
14631 return error_mark_node;
14633 if (c_dialect_objc ())
14634 objc_finish_function ();
14636 record_key_method_defined (fndecl);
14638 fntype = TREE_TYPE (fndecl);
14640 /* TREE_READONLY (fndecl) = 1;
14641 This caused &foo to be of type ptr-to-const-function
14642 which then got a warning when stored in a ptr-to-function variable. */
14644 gcc_assert (building_stmt_list_p ());
14645 /* The current function is being defined, so its DECL_INITIAL should
14646 be set, and unless there's a multiple definition, it should be
14647 error_mark_node. */
14648 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
14650 /* For a cloned function, we've already got all the code we need;
14651 there's no need to add any extra bits. */
14652 if (!DECL_CLONED_FUNCTION_P (fndecl))
14654 /* Make it so that `main' always returns 0 by default. */
14655 if (DECL_MAIN_P (current_function_decl))
14656 finish_return_stmt (integer_zero_node);
14658 if (use_eh_spec_block (current_function_decl))
14659 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
14660 (TREE_TYPE (current_function_decl)),
14661 current_eh_spec_block);
14664 /* If we're saving up tree structure, tie off the function now. */
14665 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
14667 if (fn_contains_cilk_spawn_p (cfun) && !processing_template_decl)
14668 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
14670 finish_fname_decls ();
14672 /* If this function can't throw any exceptions, remember that. */
14673 if (!processing_template_decl
14674 && !cp_function_chain->can_throw
14675 && !flag_non_call_exceptions
14676 && !decl_replaceable_p (fndecl))
14677 TREE_NOTHROW (fndecl) = 1;
14679 /* This must come after expand_function_end because cleanups might
14680 have declarations (from inline functions) that need to go into
14681 this function's blocks. */
14683 /* If the current binding level isn't the outermost binding level
14684 for this function, either there is a bug, or we have experienced
14685 syntax errors and the statement tree is malformed. */
14686 if (current_binding_level->kind != sk_function_parms)
14688 /* Make sure we have already experienced errors. */
14689 gcc_assert (errorcount);
14691 /* Throw away the broken statement tree and extra binding
14693 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
14695 while (current_binding_level->kind != sk_function_parms)
14697 if (current_binding_level->kind == sk_class)
14698 pop_nested_class ();
14700 poplevel (0, 0, 0);
14703 poplevel (1, 0, 1);
14705 /* Statements should always be full-expressions at the outermost set
14706 of curly braces for a function. */
14707 gcc_assert (stmts_are_full_exprs_p ());
14709 /* If there are no return statements in a function with auto return type,
14710 the return type is void. But if the declared type is something like
14711 auto*, this is an error. */
14712 if (!processing_template_decl && FNDECL_USED_AUTO (fndecl)
14713 && TREE_TYPE (fntype) == current_function_auto_return_pattern)
14715 if (!is_auto (current_function_auto_return_pattern)
14716 && !current_function_returns_value && !current_function_returns_null)
14718 error ("no return statements in function returning %qT",
14719 current_function_auto_return_pattern);
14720 inform (input_location, "only plain %<auto%> return type can be "
14721 "deduced to %<void%>");
14723 apply_deduced_return_type (fndecl, void_type_node);
14724 fntype = TREE_TYPE (fndecl);
14727 // If this is a concept, check that the definition is reasonable.
14728 if (DECL_DECLARED_CONCEPT_P (fndecl))
14729 check_function_concept (fndecl);
14731 /* Save constexpr function body before it gets munged by
14732 the NRV transformation. */
14733 maybe_save_function_definition (fndecl);
14735 /* Invoke the pre-genericize plugin before we start munging things. */
14736 if (!processing_template_decl)
14737 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
14739 /* Perform delayed folding before NRV transformation. */
14740 if (!processing_template_decl)
14741 cp_fold_function (fndecl);
14743 /* Set up the named return value optimization, if we can. Candidate
14744 variables are selected in check_return_expr. */
14745 if (current_function_return_value)
14747 tree r = current_function_return_value;
14750 if (r != error_mark_node
14751 /* This is only worth doing for fns that return in memory--and
14752 simpler, since we don't have to worry about promoted modes. */
14753 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
14754 /* Only allow this for variables declared in the outer scope of
14755 the function so we know that their lifetime always ends with a
14756 return; see g++.dg/opt/nrv6.C. We could be more flexible if
14757 we were to do this optimization in tree-ssa. */
14758 && (outer = outer_curly_brace_block (fndecl))
14759 && chain_member (r, BLOCK_VARS (outer)))
14760 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
14762 current_function_return_value = NULL_TREE;
14765 /* Remember that we were in class scope. */
14766 if (current_class_name)
14767 ctype = current_class_type;
14769 /* Must mark the RESULT_DECL as being in this function. */
14770 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
14772 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
14773 to the FUNCTION_DECL node itself. */
14774 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
14776 /* Save away current state, if appropriate. */
14777 if (!processing_template_decl)
14778 save_function_data (fndecl);
14780 /* Complain if there's just no return statement. */
14781 if (warn_return_type
14782 && !VOID_TYPE_P (TREE_TYPE (fntype))
14783 && !dependent_type_p (TREE_TYPE (fntype))
14784 && !current_function_returns_value && !current_function_returns_null
14785 /* Don't complain if we abort or throw. */
14786 && !current_function_returns_abnormally
14787 /* Don't complain if there's an infinite loop. */
14788 && !current_function_infinite_loop
14789 /* Don't complain if we are declared noreturn. */
14790 && !TREE_THIS_VOLATILE (fndecl)
14791 && !DECL_NAME (DECL_RESULT (fndecl))
14792 && !TREE_NO_WARNING (fndecl)
14793 /* Structor return values (if any) are set by the compiler. */
14794 && !DECL_CONSTRUCTOR_P (fndecl)
14795 && !DECL_DESTRUCTOR_P (fndecl)
14796 && targetm.warn_func_return (fndecl))
14798 warning (OPT_Wreturn_type,
14799 "no return statement in function returning non-void");
14800 TREE_NO_WARNING (fndecl) = 1;
14803 /* Store the end of the function, so that we get good line number
14804 info for the epilogue. */
14805 cfun->function_end_locus = input_location;
14807 /* Complain about parameters that are only set, but never otherwise used. */
14808 if (warn_unused_but_set_parameter
14809 && !processing_template_decl
14810 && errorcount == unused_but_set_errorcount
14811 && !DECL_CLONED_FUNCTION_P (fndecl))
14815 for (decl = DECL_ARGUMENTS (fndecl);
14817 decl = DECL_CHAIN (decl))
14818 if (TREE_USED (decl)
14819 && TREE_CODE (decl) == PARM_DECL
14820 && !DECL_READ_P (decl)
14821 && DECL_NAME (decl)
14822 && !DECL_ARTIFICIAL (decl)
14823 && !TREE_NO_WARNING (decl)
14824 && !DECL_IN_SYSTEM_HEADER (decl)
14825 && TREE_TYPE (decl) != error_mark_node
14826 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
14827 && (!CLASS_TYPE_P (TREE_TYPE (decl))
14828 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
14829 warning_at (DECL_SOURCE_LOCATION (decl),
14830 OPT_Wunused_but_set_parameter,
14831 "parameter %qD set but not used", decl);
14832 unused_but_set_errorcount = errorcount;
14835 /* Complain about locally defined typedefs that are not used in this
14837 maybe_warn_unused_local_typedefs ();
14839 /* Possibly warn about unused parameters. */
14840 if (warn_unused_parameter
14841 && !processing_template_decl
14842 && !DECL_CLONED_FUNCTION_P (fndecl))
14843 do_warn_unused_parameter (fndecl);
14845 /* Genericize before inlining. */
14846 if (!processing_template_decl)
14848 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
14849 cp_genericize (fndecl);
14850 /* Clear out the bits we don't need. */
14851 f->x_current_class_ptr = NULL;
14852 f->x_current_class_ref = NULL;
14853 f->x_eh_spec_block = NULL;
14854 f->x_in_charge_parm = NULL;
14855 f->x_vtt_parm = NULL;
14856 f->x_return_value = NULL;
14857 f->bindings = NULL;
14858 f->extern_decl_map = NULL;
14859 f->infinite_loops = NULL;
14861 /* Clear out the bits we don't need. */
14862 local_names = NULL;
14864 /* We're leaving the context of this function, so zap cfun. It's still in
14865 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
14867 current_function_decl = NULL;
14869 /* If this is an in-class inline definition, we may have to pop the
14870 bindings for the template parameters that we added in
14871 maybe_begin_member_template_processing when start_function was
14873 if (inclass_inline)
14874 maybe_end_member_template_processing ();
14876 /* Leave the scope of the class. */
14878 pop_nested_class ();
14883 current_function_decl = NULL_TREE;
14885 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION, fndecl);
14889 /* Create the FUNCTION_DECL for a function definition.
14890 DECLSPECS and DECLARATOR are the parts of the declaration;
14891 they describe the return type and the name of the function,
14892 but twisted together in a fashion that parallels the syntax of C.
14894 This function creates a binding context for the function body
14895 as well as setting up the FUNCTION_DECL in current_function_decl.
14897 Returns a FUNCTION_DECL on success.
14899 If the DECLARATOR is not suitable for a function (it defines a datum
14900 instead), we return 0, which tells yyparse to report a parse error.
14902 May return void_type_node indicating that this method is actually
14903 a friend. See grokfield for more details.
14905 Came here with a `.pushlevel' .
14907 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
14908 CHANGES TO CODE IN `grokfield'. */
14911 grokmethod (cp_decl_specifier_seq *declspecs,
14912 const cp_declarator *declarator, tree attrlist)
14914 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
14917 if (fndecl == error_mark_node)
14918 return error_mark_node;
14920 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
14922 error ("invalid member function declaration");
14923 return error_mark_node;
14927 cplus_decl_attributes (&fndecl, attrlist, 0);
14929 /* Pass friends other than inline friend functions back. */
14930 if (fndecl == void_type_node)
14933 if (DECL_IN_AGGR_P (fndecl))
14935 if (DECL_CLASS_SCOPE_P (fndecl))
14936 error ("%qD is already defined in class %qT", fndecl,
14937 DECL_CONTEXT (fndecl));
14938 return error_mark_node;
14941 check_template_shadow (fndecl);
14943 if (TREE_PUBLIC (fndecl))
14944 DECL_COMDAT (fndecl) = 1;
14945 DECL_DECLARED_INLINE_P (fndecl) = 1;
14946 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
14948 /* We process method specializations in finish_struct_1. */
14949 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
14951 fndecl = push_template_decl (fndecl);
14952 if (fndecl == error_mark_node)
14956 if (! DECL_FRIEND_P (fndecl))
14958 if (DECL_CHAIN (fndecl))
14960 fndecl = copy_node (fndecl);
14961 TREE_CHAIN (fndecl) = NULL_TREE;
14965 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
14967 DECL_IN_AGGR_P (fndecl) = 1;
14972 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
14973 we can lay it out later, when and if its type becomes complete.
14975 Also handle constexpr variables where the initializer involves
14976 an unlowered PTRMEM_CST because the class isn't complete yet. */
14979 maybe_register_incomplete_var (tree var)
14981 gcc_assert (VAR_P (var));
14983 /* Keep track of variables with incomplete types. */
14984 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
14985 && DECL_EXTERNAL (var))
14987 tree inner_type = TREE_TYPE (var);
14989 while (TREE_CODE (inner_type) == ARRAY_TYPE)
14990 inner_type = TREE_TYPE (inner_type);
14991 inner_type = TYPE_MAIN_VARIANT (inner_type);
14993 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
14994 /* RTTI TD entries are created while defining the type_info. */
14995 || (TYPE_LANG_SPECIFIC (inner_type)
14996 && TYPE_BEING_DEFINED (inner_type)))
14998 incomplete_var iv = {var, inner_type};
14999 vec_safe_push (incomplete_vars, iv);
15001 else if (!(DECL_LANG_SPECIFIC (var) && DECL_TEMPLATE_INFO (var))
15002 && decl_constant_var_p (var)
15003 && (TYPE_PTRMEM_P (inner_type) || CLASS_TYPE_P (inner_type)))
15005 /* When the outermost open class is complete we can resolve any
15006 pointers-to-members. */
15007 tree context = outermost_open_class ();
15008 incomplete_var iv = {var, context};
15009 vec_safe_push (incomplete_vars, iv);
15014 /* Called when a class type (given by TYPE) is defined. If there are
15015 any existing VAR_DECLs whose type has been completed by this
15016 declaration, update them now. */
15019 complete_vars (tree type)
15022 incomplete_var *iv;
15024 for (ix = 0; vec_safe_iterate (incomplete_vars, ix, &iv); )
15026 if (same_type_p (type, iv->incomplete_type))
15028 tree var = iv->decl;
15029 tree type = TREE_TYPE (var);
15031 if (type != error_mark_node
15032 && (TYPE_MAIN_VARIANT (strip_array_types (type))
15033 == iv->incomplete_type))
15035 /* Complete the type of the variable. The VAR_DECL itself
15036 will be laid out in expand_expr. */
15037 complete_type (type);
15038 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
15041 /* Remove this entry from the list. */
15042 incomplete_vars->unordered_remove (ix);
15048 /* Check for pending declarations which may have abstract type. */
15049 complete_type_check_abstract (type);
15052 /* If DECL is of a type which needs a cleanup, build and return an
15053 expression to perform that cleanup here. Return NULL_TREE if no
15054 cleanup need be done. DECL can also be a _REF when called from
15055 split_nonconstant_init_1. */
15058 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
15064 /* Assume no cleanup is required. */
15065 cleanup = NULL_TREE;
15067 if (error_operand_p (decl))
15070 /* Handle "__attribute__((cleanup))". We run the cleanup function
15071 before the destructor since the destructor is what actually
15072 terminates the lifetime of the object. */
15074 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
15083 /* Get the name specified by the user for the cleanup function. */
15084 id = TREE_VALUE (TREE_VALUE (attr));
15085 /* Look up the name to find the cleanup function to call. It is
15086 important to use lookup_name here because that is what is
15087 used in c-common.c:handle_cleanup_attribute when performing
15088 initial checks on the attribute. Note that those checks
15089 include ensuring that the function found is not an overloaded
15090 function, or an object with an overloaded call operator,
15091 etc.; we can rely on the fact that the function found is an
15092 ordinary FUNCTION_DECL. */
15093 fn = lookup_name (id);
15094 arg = build_address (decl);
15095 if (!mark_used (decl, complain) && !(complain & tf_error))
15096 return error_mark_node;
15097 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
15098 if (cleanup == error_mark_node)
15099 return error_mark_node;
15101 /* Handle ordinary C++ destructors. */
15102 type = TREE_TYPE (decl);
15103 if (type_build_dtor_call (type))
15105 int flags = LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR;
15109 if (TREE_CODE (type) == ARRAY_TYPE)
15112 addr = build_address (decl);
15114 call = build_delete (TREE_TYPE (addr), addr,
15115 sfk_complete_destructor, flags, 0, complain);
15116 if (call == error_mark_node)
15117 cleanup = error_mark_node;
15118 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
15119 /* Discard the call. */;
15121 cleanup = cp_build_compound_expr (cleanup, call, complain);
15126 /* build_delete sets the location of the destructor call to the
15127 current location, even though the destructor is going to be
15128 called later, at the end of the current scope. This can lead to
15129 a "jumpy" behavior for users of debuggers when they step around
15130 the end of the block. So let's unset the location of the
15131 destructor call instead. */
15132 protected_set_expr_location (cleanup, UNKNOWN_LOCATION);
15136 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl)))
15137 /* Treat objects with destructors as used; the destructor may do
15138 something substantive. */
15139 && !mark_used (decl, complain) && !(complain & tf_error))
15140 return error_mark_node;
15146 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
15147 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
15148 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
15151 static_fn_type (tree memfntype)
15156 if (TYPE_PTRMEMFUNC_P (memfntype))
15157 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
15158 if (POINTER_TYPE_P (memfntype)
15159 || TREE_CODE (memfntype) == FUNCTION_DECL)
15160 memfntype = TREE_TYPE (memfntype);
15161 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
15163 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
15164 args = TYPE_ARG_TYPES (memfntype);
15165 cp_ref_qualifier rqual = type_memfn_rqual (memfntype);
15166 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
15167 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype), rqual);
15168 fntype = (cp_build_type_attribute_variant
15169 (fntype, TYPE_ATTRIBUTES (memfntype)));
15170 fntype = (build_exception_variant
15171 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
15172 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype))
15173 TYPE_HAS_LATE_RETURN_TYPE (fntype) = 1;
15177 /* DECL was originally constructed as a non-static member function,
15178 but turned out to be static. Update it accordingly. */
15181 revert_static_member_fn (tree decl)
15183 tree stype = static_fn_type (decl);
15184 cp_cv_quals quals = type_memfn_quals (stype);
15185 cp_ref_qualifier rqual = type_memfn_rqual (stype);
15187 if (quals != TYPE_UNQUALIFIED || rqual != REF_QUAL_NONE)
15188 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED, REF_QUAL_NONE);
15190 TREE_TYPE (decl) = stype;
15192 if (DECL_ARGUMENTS (decl))
15193 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
15194 DECL_STATIC_FUNCTION_P (decl) = 1;
15197 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
15198 one of the language-independent trees. */
15200 enum cp_tree_node_structure_enum
15201 cp_tree_node_structure (union lang_tree_node * t)
15203 switch (TREE_CODE (&t->generic))
15205 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
15206 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
15207 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
15208 case OVERLOAD: return TS_CP_OVERLOAD;
15209 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
15210 case PTRMEM_CST: return TS_CP_PTRMEM;
15211 case BASELINK: return TS_CP_BASELINK;
15212 case TEMPLATE_DECL: return TS_CP_TEMPLATE_DECL;
15213 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
15214 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
15215 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
15216 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
15217 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
15218 case CONSTRAINT_INFO: return TS_CP_CONSTRAINT_INFO;
15219 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
15220 default: return TS_CP_GENERIC;
15224 /* Build the void_list_node (void_type_node having been created). */
15226 build_void_list_node (void)
15228 tree t = build_tree_list (NULL_TREE, void_type_node);
15233 cp_missing_noreturn_ok_p (tree decl)
15235 /* A missing noreturn is ok for the `main' function. */
15236 return DECL_MAIN_P (decl);
15239 /* Return the decl used to identify the COMDAT group into which DECL should
15243 cxx_comdat_group (tree decl)
15245 /* Virtual tables, construction virtual tables, and virtual table
15246 tables all go in a single COMDAT group, named after the primary
15248 if (VAR_P (decl) && DECL_VTABLE_OR_VTT_P (decl))
15249 decl = CLASSTYPE_VTABLES (DECL_CONTEXT (decl));
15250 /* For all other DECLs, the COMDAT group is the mangled name of the
15251 declaration itself. */
15254 while (DECL_THUNK_P (decl))
15256 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
15257 into the same section as the target function. In that case
15258 we must return target's name. */
15259 tree target = THUNK_TARGET (decl);
15260 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
15261 && DECL_SECTION_NAME (target) != NULL
15262 && DECL_ONE_ONLY (target))
15272 /* Returns the return type for FN as written by the user, which may include
15273 a placeholder for a deduced return type. */
15276 fndecl_declared_return_type (tree fn)
15278 fn = STRIP_TEMPLATE (fn);
15279 if (FNDECL_USED_AUTO (fn))
15281 struct language_function *f = NULL;
15282 if (DECL_STRUCT_FUNCTION (fn))
15283 f = DECL_STRUCT_FUNCTION (fn)->language;
15285 f = DECL_SAVED_FUNCTION_DATA (fn);
15286 return f->x_auto_return_pattern;
15288 return TREE_TYPE (TREE_TYPE (fn));
15291 /* Returns true iff DECL was declared with an auto return type and it has
15292 not yet been deduced to a real type. */
15295 undeduced_auto_decl (tree decl)
15297 if (cxx_dialect < cxx14)
15299 return type_uses_auto (TREE_TYPE (decl));
15302 /* Complain if DECL has an undeduced return type. */
15305 require_deduced_type (tree decl)
15307 if (undeduced_auto_decl (decl))
15308 error ("use of %qD before deduction of %<auto%>", decl);
15311 #include "gt-cp-decl.h"