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 /* To avoid unwanted recursion, finish_function defers all mark_used calls
231 encountered during its execution until it finishes. */
232 bool defer_mark_used_calls;
233 vec<tree, va_gc> *deferred_mark_used_calls;
235 /* States indicating how grokdeclarator() should handle declspecs marked
236 with __attribute__((deprecated)). An object declared as
237 __attribute__((deprecated)) suppresses warnings of uses of other
239 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
242 /* A list of VAR_DECLs whose type was incomplete at the time the
243 variable was declared. */
245 struct GTY(()) incomplete_var {
247 tree incomplete_type;
251 static GTY(()) vec<incomplete_var, va_gc> *incomplete_vars;
253 /* Returns the kind of template specialization we are currently
254 processing, given that it's declaration contained N_CLASS_SCOPES
255 explicit scope qualifications. */
258 current_tmpl_spec_kind (int n_class_scopes)
260 int n_template_parm_scopes = 0;
261 int seen_specialization_p = 0;
262 int innermost_specialization_p = 0;
265 /* Scan through the template parameter scopes. */
266 for (b = current_binding_level;
267 b->kind == sk_template_parms;
270 /* If we see a specialization scope inside a parameter scope,
271 then something is wrong. That corresponds to a declaration
274 template <class T> template <> ...
276 which is always invalid since [temp.expl.spec] forbids the
277 specialization of a class member template if the enclosing
278 class templates are not explicitly specialized as well. */
279 if (b->explicit_spec_p)
281 if (n_template_parm_scopes == 0)
282 innermost_specialization_p = 1;
284 seen_specialization_p = 1;
286 else if (seen_specialization_p == 1)
287 return tsk_invalid_member_spec;
289 ++n_template_parm_scopes;
292 /* Handle explicit instantiations. */
293 if (processing_explicit_instantiation)
295 if (n_template_parm_scopes != 0)
296 /* We've seen a template parameter list during an explicit
297 instantiation. For example:
299 template <class T> template void f(int);
301 This is erroneous. */
302 return tsk_invalid_expl_inst;
304 return tsk_expl_inst;
307 if (n_template_parm_scopes < n_class_scopes)
308 /* We've not seen enough template headers to match all the
309 specialized classes present. For example:
311 template <class T> void R<T>::S<T>::f(int);
313 This is invalid; there needs to be one set of template
314 parameters for each class. */
315 return tsk_insufficient_parms;
316 else if (n_template_parm_scopes == n_class_scopes)
317 /* We're processing a non-template declaration (even though it may
318 be a member of a template class.) For example:
320 template <class T> void S<T>::f(int);
322 The `class T' matches the `S<T>', leaving no template headers
323 corresponding to the `f'. */
325 else if (n_template_parm_scopes > n_class_scopes + 1)
326 /* We've got too many template headers. For example:
328 template <> template <class T> void f (T);
330 There need to be more enclosing classes. */
331 return tsk_excessive_parms;
333 /* This must be a template. It's of the form:
335 template <class T> template <class U> void S<T>::f(U);
337 This is a specialization if the innermost level was a
338 specialization; otherwise it's just a definition of the
340 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
343 /* Exit the current scope. */
351 /* When a label goes out of scope, check to see if that label was used
352 in a valid manner, and issue any appropriate warnings or errors. */
355 pop_label (tree label, tree old_value)
357 if (!processing_template_decl)
359 if (DECL_INITIAL (label) == NULL_TREE)
363 error ("label %q+D used but not defined", label);
364 location = input_location;
365 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
366 /* Avoid crashing later. */
367 define_label (location, DECL_NAME (label));
370 warn_for_unused_label (label);
373 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
376 /* At the end of a function, all labels declared within the function
377 go out of scope. BLOCK is the top-level block for the
381 pop_labels_1 (named_label_entry **slot, tree block)
383 struct named_label_entry *ent = *slot;
385 pop_label (ent->label_decl, NULL_TREE);
387 /* Put the labels into the "variables" of the top-level block,
388 so debugger can see them. */
389 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
390 BLOCK_VARS (block) = ent->label_decl;
392 named_labels->clear_slot (slot);
398 pop_labels (tree block)
402 named_labels->traverse<tree, pop_labels_1> (block);
407 /* At the end of a block with local labels, restore the outer definition. */
410 pop_local_label (tree label, tree old_value)
412 struct named_label_entry dummy;
414 pop_label (label, old_value);
416 dummy.label_decl = label;
417 named_label_entry **slot = named_labels->find_slot (&dummy, NO_INSERT);
418 named_labels->clear_slot (slot);
421 /* The following two routines are used to interface to Objective-C++.
422 The binding level is purposely treated as an opaque type. */
425 objc_get_current_scope (void)
427 return current_binding_level;
430 /* The following routine is used by the NeXT-style SJLJ exceptions;
431 variables get marked 'volatile' so as to not be clobbered by
432 _setjmp()/_longjmp() calls. All variables in the current scope,
433 as well as parent scopes up to (but not including) ENCLOSING_BLK
434 shall be thusly marked. */
437 objc_mark_locals_volatile (void *enclosing_blk)
439 cp_binding_level *scope;
441 for (scope = current_binding_level;
442 scope && scope != enclosing_blk;
443 scope = scope->level_chain)
447 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
448 objc_volatilize_decl (decl);
450 /* Do not climb up past the current function. */
451 if (scope->kind == sk_function_parms)
456 /* Update data for defined and undefined labels when leaving a scope. */
459 poplevel_named_label_1 (named_label_entry **slot, cp_binding_level *bl)
461 named_label_entry *ent = *slot;
462 cp_binding_level *obl = bl->level_chain;
464 if (ent->binding_level == bl)
468 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
469 TREE_LISTs representing OVERLOADs, so be careful. */
470 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
472 : TREE_CHAIN (decl)))
473 if (decl_jump_unsafe (decl))
474 vec_safe_push (ent->bad_decls, decl);
476 ent->binding_level = obl;
477 ent->names_in_scope = obl->names;
481 ent->in_try_scope = true;
484 ent->in_catch_scope = true;
487 ent->in_omp_scope = true;
490 ent->in_transaction_scope = true;
498 struct named_label_use_entry *use;
500 for (use = ent->uses; use ; use = use->next)
501 if (use->binding_level == bl)
503 use->binding_level = obl;
504 use->names_in_scope = obl->names;
505 if (bl->kind == sk_omp)
506 use->in_omp_scope = true;
513 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
514 when errors were reported, except for -Werror-unused-but-set-*. */
515 static int unused_but_set_errorcount;
517 /* Exit a binding level.
518 Pop the level off, and restore the state of the identifier-decl mappings
519 that were in effect when this level was entered.
521 If KEEP == 1, this level had explicit declarations, so
522 and create a "block" (a BLOCK node) for the level
523 to record its declarations and subblocks for symbol table output.
525 If FUNCTIONBODY is nonzero, this level is the body of a function,
526 so create a block as if KEEP were set and also clear out all
529 If REVERSE is nonzero, reverse the order of decls before putting
530 them into the BLOCK. */
533 poplevel (int keep, int reverse, int functionbody)
536 /* The chain of decls was accumulated in reverse order.
537 Put it into forward order, just for cleanliness. */
542 int leaving_for_scope;
545 cp_label_binding *label_bind;
547 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
552 gcc_assert (current_binding_level->kind != sk_class);
554 if (current_binding_level->kind == sk_cleanup)
556 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
558 gcc_assert (!vec_safe_length (current_binding_level->class_shadowed));
560 /* We used to use KEEP == 2 to indicate that the new block should go
561 at the beginning of the list of blocks at this binding level,
562 rather than the end. This hack is no longer used. */
563 gcc_assert (keep == 0 || keep == 1);
565 if (current_binding_level->keep)
568 /* Any uses of undefined labels, and any defined labels, now operate
569 under constraints of next binding contour. */
570 if (cfun && !functionbody && named_labels)
571 named_labels->traverse<cp_binding_level *, poplevel_named_label_1>
572 (current_binding_level);
574 /* Get the decls in the order they were written.
575 Usually current_binding_level->names is in reverse order.
576 But parameter decls were previously put in forward order. */
579 current_binding_level->names
580 = decls = nreverse (current_binding_level->names);
582 decls = current_binding_level->names;
584 /* If there were any declarations or structure tags in that level,
585 or if this level is a function body,
586 create a BLOCK to record them for the life of this function. */
588 /* Avoid function body block if possible. */
589 if (functionbody && subblocks && BLOCK_CHAIN (subblocks) == NULL_TREE)
591 else if (keep == 1 || functionbody)
592 block = make_node (BLOCK);
593 if (block != NULL_TREE)
595 BLOCK_VARS (block) = decls;
596 BLOCK_SUBBLOCKS (block) = subblocks;
599 /* In each subblock, record that this is its superior. */
601 for (link = subblocks; link; link = BLOCK_CHAIN (link))
602 BLOCK_SUPERCONTEXT (link) = block;
604 /* We still support the old for-scope rules, whereby the variables
605 in a for-init statement were in scope after the for-statement
606 ended. We only use the new rules if flag_new_for_scope is
609 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
611 /* Before we remove the declarations first check for unused variables. */
612 if ((warn_unused_variable || warn_unused_but_set_variable)
613 && current_binding_level->kind != sk_template_parms
614 && !processing_template_decl)
615 for (tree d = getdecls (); d; d = TREE_CHAIN (d))
617 /* There are cases where D itself is a TREE_LIST. See in
618 push_local_binding where the list of decls returned by
619 getdecls is built. */
620 decl = TREE_CODE (d) == TREE_LIST ? TREE_VALUE (d) : d;
621 tree type = TREE_TYPE (decl);
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl)
626 && type != error_mark_node
627 && (!CLASS_TYPE_P (type)
628 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
629 || lookup_attribute ("warn_unused",
630 TYPE_ATTRIBUTES (TREE_TYPE (decl)))))
632 if (! TREE_USED (decl))
633 warning_at (DECL_SOURCE_LOCATION (decl),
634 OPT_Wunused_variable, "unused variable %qD", decl);
635 else if (DECL_CONTEXT (decl) == current_function_decl
636 // For -Wunused-but-set-variable leave references alone.
637 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
638 && errorcount == unused_but_set_errorcount)
640 warning_at (DECL_SOURCE_LOCATION (decl),
641 OPT_Wunused_but_set_variable,
642 "variable %qD set but not used", decl);
643 unused_but_set_errorcount = errorcount;
648 /* Remove declarations for all the DECLs in this level. */
649 for (link = decls; link; link = TREE_CHAIN (link))
651 if (leaving_for_scope && VAR_P (link)
652 /* It's hard to make this ARM compatibility hack play nicely with
653 lambdas, and it really isn't necessary in C++11 mode. */
654 && cxx_dialect < cxx11
657 tree name = DECL_NAME (link);
661 ob = outer_binding (name,
662 IDENTIFIER_BINDING (name),
665 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
667 ns_binding = NULL_TREE;
669 if (ob && ob->scope == current_binding_level->level_chain)
670 /* We have something like:
675 and we are leaving the `for' scope. There's no reason to
676 keep the binding of the inner `i' in this case. */
677 pop_binding (name, link);
678 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
679 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
680 /* Here, we have something like:
688 We must pop the for-scope binding so we know what's a
689 type and what isn't. */
690 pop_binding (name, link);
693 /* Mark this VAR_DECL as dead so that we can tell we left it
694 there only for backward compatibility. */
695 DECL_DEAD_FOR_LOCAL (link) = 1;
697 /* Keep track of what should have happened when we
698 popped the binding. */
701 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
702 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
705 /* Add it to the list of dead variables in the next
706 outermost binding to that we can remove these when we
707 leave that binding. */
709 current_binding_level->level_chain->dead_vars_from_for,
712 /* Although we don't pop the cxx_binding, we do clear
713 its SCOPE since the scope is going away now. */
714 IDENTIFIER_BINDING (name)->scope
715 = current_binding_level->level_chain;
722 /* Remove the binding. */
725 if (TREE_CODE (decl) == TREE_LIST)
726 decl = TREE_VALUE (decl);
729 if (TREE_CODE (name) == OVERLOAD)
730 name = OVL_FUNCTION (name);
732 gcc_assert (DECL_P (name));
733 pop_binding (DECL_NAME (name), decl);
737 /* Remove declarations for any `for' variables from inner scopes
738 that we kept around. */
739 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level->dead_vars_from_for,
741 pop_binding (DECL_NAME (decl), decl);
743 /* Restore the IDENTIFIER_TYPE_VALUEs. */
744 for (link = current_binding_level->type_shadowed;
745 link; link = TREE_CHAIN (link))
746 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
748 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
749 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level->shadowed_labels,
751 pop_local_label (label_bind->label, label_bind->prev_value);
753 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
754 list if a `using' declaration put them there. The debugging
755 back ends won't understand OVERLOAD, so we remove them here.
756 Because the BLOCK_VARS are (temporarily) shared with
757 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
758 popped all the bindings. */
763 for (d = &BLOCK_VARS (block); *d; )
765 if (TREE_CODE (*d) == TREE_LIST)
766 *d = TREE_CHAIN (*d);
768 d = &DECL_CHAIN (*d);
772 /* If the level being exited is the top level of a function,
773 check over all the labels. */
778 /* Since this is the top level block of a function, the vars are
779 the function's parameters. Don't leave them in the BLOCK
780 because they are found in the FUNCTION_DECL instead. */
781 BLOCK_VARS (block) = 0;
785 pop_labels (subblocks);
788 kind = current_binding_level->kind;
789 if (kind == sk_cleanup)
793 /* If this is a temporary binding created for a cleanup, then we'll
794 have pushed a statement list level. Pop that, create a new
795 BIND_EXPR for the block, and insert it into the stream. */
796 stmt = pop_stmt_list (current_binding_level->statement_list);
797 stmt = c_build_bind_expr (input_location, block, stmt);
804 /* The current function is being defined, so its DECL_INITIAL
805 should be error_mark_node. */
806 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
807 DECL_INITIAL (current_function_decl) = block ? block : subblocks;
810 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
812 if (BLOCK_SUBBLOCKS (subblocks))
813 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks)) = 1;
816 BLOCK_OUTER_CURLY_BRACE_P (subblocks) = 1;
820 current_binding_level->blocks
821 = block_chainon (current_binding_level->blocks, block);
823 /* If we did not make a block for the level just exited,
824 any blocks made for inner levels
825 (since they cannot be recorded as subblocks in that level)
826 must be carried forward so they will later become subblocks
827 of something else. */
829 current_binding_level->blocks
830 = block_chainon (current_binding_level->blocks, subblocks);
832 /* Each and every BLOCK node created here in `poplevel' is important
833 (e.g. for proper debugging information) so if we created one
834 earlier, mark it as "used". */
836 TREE_USED (block) = 1;
838 /* All temporary bindings created for cleanups are popped silently. */
839 if (kind == sk_cleanup)
842 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
846 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
847 itself, calling F for each. The DATA is passed to F as well. */
850 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
853 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
855 result |= (*f) (name_space, data);
857 for (; current; current = DECL_CHAIN (current))
858 result |= walk_namespaces_r (current, f, data);
863 /* Walk all the namespaces, calling F for each. The DATA is passed to
867 walk_namespaces (walk_namespaces_fn f, void* data)
869 return walk_namespaces_r (global_namespace, f, data);
872 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
875 wrapup_globals_for_namespace (tree name_space, void* data ATTRIBUTE_UNUSED)
877 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
878 vec<tree, va_gc> *statics = level->static_decls;
879 tree *vec = statics->address ();
880 int len = statics->length ();
882 if (warn_unused_function)
886 FOR_EACH_VEC_SAFE_ELT (statics, i, decl)
887 if (TREE_CODE (decl) == FUNCTION_DECL
888 && DECL_INITIAL (decl) == 0
889 && DECL_EXTERNAL (decl)
890 && !TREE_PUBLIC (decl)
891 && !DECL_ARTIFICIAL (decl)
892 && !TREE_NO_WARNING (decl))
894 warning (OPT_Wunused_function,
895 "%q+F declared %<static%> but never defined", decl);
896 TREE_NO_WARNING (decl) = 1;
900 /* Write out any globals that need to be output. */
901 return wrapup_global_declarations (vec, len);
904 /* In C++, you don't have to write `struct S' to refer to `S'; you
905 can just use `S'. We accomplish this by creating a TYPE_DECL as
906 if the user had written `typedef struct S S'. Create and return
907 the TYPE_DECL for TYPE. */
910 create_implicit_typedef (tree name, tree type)
914 decl = build_decl (input_location, TYPE_DECL, name, type);
915 DECL_ARTIFICIAL (decl) = 1;
916 /* There are other implicit type declarations, like the one *within*
917 a class that allows you to write `S::S'. We must distinguish
919 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
920 TYPE_NAME (type) = decl;
921 TYPE_STUB_DECL (type) = decl;
926 /* Remember a local name for name-mangling purposes. */
929 push_local_name (tree decl)
934 timevar_start (TV_NAME_LOOKUP);
936 name = DECL_NAME (decl);
938 nelts = vec_safe_length (local_names);
939 for (i = 0; i < nelts; i++)
941 t = (*local_names)[i];
942 if (DECL_NAME (t) == name)
944 if (!DECL_LANG_SPECIFIC (decl))
945 retrofit_lang_decl (decl);
946 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
947 if (DECL_DISCRIMINATOR_SET_P (t))
948 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
950 DECL_DISCRIMINATOR (decl) = 1;
952 (*local_names)[i] = decl;
953 timevar_stop (TV_NAME_LOOKUP);
958 vec_safe_push (local_names, decl);
959 timevar_stop (TV_NAME_LOOKUP);
962 /* Subroutine of duplicate_decls: return truthvalue of whether
963 or not types of these decls match.
965 For C++, we must compare the parameter list so that `int' can match
966 `int&' in a parameter position, but `int&' is not confused with
970 decls_match (tree newdecl, tree olddecl)
974 if (newdecl == olddecl)
977 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
978 /* If the two DECLs are not even the same kind of thing, we're not
979 interested in their types. */
982 gcc_assert (DECL_P (newdecl));
984 if (TREE_CODE (newdecl) == FUNCTION_DECL)
986 tree f1 = TREE_TYPE (newdecl);
987 tree f2 = TREE_TYPE (olddecl);
988 tree p1 = TYPE_ARG_TYPES (f1);
989 tree p2 = TYPE_ARG_TYPES (f2);
992 /* Specializations of different templates are different functions
993 even if they have the same type. */
994 tree t1 = (DECL_USE_TEMPLATE (newdecl)
995 ? DECL_TI_TEMPLATE (newdecl)
997 tree t2 = (DECL_USE_TEMPLATE (olddecl)
998 ? DECL_TI_TEMPLATE (olddecl)
1003 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1004 && ! (DECL_EXTERN_C_P (newdecl)
1005 && DECL_EXTERN_C_P (olddecl)))
1008 /* A new declaration doesn't match a built-in one unless it
1009 is also extern "C". */
1010 if (DECL_IS_BUILTIN (olddecl)
1011 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
1014 if (TREE_CODE (f1) != TREE_CODE (f2))
1017 /* A declaration with deduced return type should use its pre-deduction
1018 type for declaration matching. */
1019 r2 = fndecl_declared_return_type (olddecl);
1021 if (same_type_p (TREE_TYPE (f1), r2))
1023 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
1024 && (DECL_BUILT_IN (olddecl)
1025 #ifndef NO_IMPLICIT_EXTERN_C
1026 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
1027 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
1031 types_match = self_promoting_args_p (p1);
1032 if (p1 == void_list_node)
1033 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1035 #ifndef NO_IMPLICIT_EXTERN_C
1036 else if (!prototype_p (f1)
1037 && (DECL_EXTERN_C_P (olddecl)
1038 && DECL_IN_SYSTEM_HEADER (olddecl)
1039 && !DECL_CLASS_SCOPE_P (olddecl))
1040 && (DECL_EXTERN_C_P (newdecl)
1041 && DECL_IN_SYSTEM_HEADER (newdecl)
1042 && !DECL_CLASS_SCOPE_P (newdecl)))
1044 types_match = self_promoting_args_p (p2);
1045 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1051 && type_memfn_rqual (f1) == type_memfn_rqual (f2)
1052 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1053 || comp_type_attributes (TREE_TYPE (newdecl),
1054 TREE_TYPE (olddecl)) != 0);
1059 /* The decls dont match if they correspond to two different versions
1060 of the same function. Disallow extern "C" functions to be
1061 versions for now. */
1063 && !DECL_EXTERN_C_P (newdecl)
1064 && !DECL_EXTERN_C_P (olddecl)
1065 && targetm.target_option.function_versions (newdecl, olddecl))
1067 /* Mark functions as versions if necessary. Modify the mangled decl
1068 name if necessary. */
1069 if (DECL_FUNCTION_VERSIONED (newdecl)
1070 && DECL_FUNCTION_VERSIONED (olddecl))
1072 if (!DECL_FUNCTION_VERSIONED (newdecl))
1074 DECL_FUNCTION_VERSIONED (newdecl) = 1;
1075 if (DECL_ASSEMBLER_NAME_SET_P (newdecl))
1076 mangle_decl (newdecl);
1078 if (!DECL_FUNCTION_VERSIONED (olddecl))
1080 DECL_FUNCTION_VERSIONED (olddecl) = 1;
1081 if (DECL_ASSEMBLER_NAME_SET_P (olddecl))
1082 mangle_decl (olddecl);
1084 cgraph_node::record_function_versions (olddecl, newdecl);
1088 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1090 tree oldres = DECL_TEMPLATE_RESULT (olddecl);
1091 tree newres = DECL_TEMPLATE_RESULT (newdecl);
1093 if (TREE_CODE (newres) != TREE_CODE (oldres))
1096 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1097 DECL_TEMPLATE_PARMS (olddecl)))
1100 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1101 types_match = (same_type_p (TREE_TYPE (oldres), TREE_TYPE (newres))
1102 && equivalently_constrained (olddecl, newdecl));
1104 // We don't need to check equivalently_constrained for variable and
1105 // function templates because we check it on the results.
1106 types_match = decls_match (oldres, newres);
1110 /* Need to check scope for variable declaration (VAR_DECL).
1111 For typedef (TYPE_DECL), scope is ignored. */
1113 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1115 Two declarations for an object with C language linkage
1116 with the same name (ignoring the namespace that qualify
1117 it) that appear in different namespace scopes refer to
1119 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1122 if (TREE_TYPE (newdecl) == error_mark_node)
1123 types_match = TREE_TYPE (olddecl) == error_mark_node;
1124 else if (TREE_TYPE (olddecl) == NULL_TREE)
1125 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1126 else if (TREE_TYPE (newdecl) == NULL_TREE)
1129 types_match = comptypes (TREE_TYPE (newdecl),
1130 TREE_TYPE (olddecl),
1131 COMPARE_REDECLARATION);
1134 // Normal functions can be constrained, as can variable partial
1136 if (types_match && VAR_OR_FUNCTION_DECL_P (newdecl))
1137 types_match = equivalently_constrained (newdecl, olddecl);
1142 /* If NEWDECL is `static' and an `extern' was seen previously,
1143 warn about it. OLDDECL is the previous declaration.
1145 Note that this does not apply to the C++ case of declaring
1146 a variable `extern const' and then later `const'.
1148 Don't complain about built-in functions, since they are beyond
1149 the user's control. */
1152 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1154 if (TREE_CODE (newdecl) == TYPE_DECL
1155 || TREE_CODE (newdecl) == TEMPLATE_DECL
1156 || TREE_CODE (newdecl) == CONST_DECL
1157 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1160 /* Don't get confused by static member functions; that's a different
1162 if (TREE_CODE (newdecl) == FUNCTION_DECL
1163 && DECL_STATIC_FUNCTION_P (newdecl))
1166 /* If the old declaration was `static', or the new one isn't, then
1167 everything is OK. */
1168 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1171 /* It's OK to declare a builtin function as `static'. */
1172 if (TREE_CODE (olddecl) == FUNCTION_DECL
1173 && DECL_ARTIFICIAL (olddecl))
1176 if (permerror (DECL_SOURCE_LOCATION (newdecl),
1177 "%qD was declared %<extern%> and later %<static%>", newdecl))
1178 inform (DECL_SOURCE_LOCATION (olddecl),
1179 "previous declaration of %qD", olddecl);
1182 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1183 function templates. If their exception specifications do not
1184 match, issue a diagnostic. */
1187 check_redeclaration_exception_specification (tree new_decl,
1190 tree new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1191 tree old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1193 /* Two default specs are equivalent, don't force evaluation. */
1194 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions)
1195 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions))
1198 maybe_instantiate_noexcept (new_decl);
1199 maybe_instantiate_noexcept (old_decl);
1200 new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1201 old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1205 If any declaration of a function has an exception-specification,
1206 all declarations, including the definition and an explicit
1207 specialization, of that function shall have an
1208 exception-specification with the same set of type-ids. */
1209 if (! DECL_IS_BUILTIN (old_decl)
1211 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1214 = "declaration of %q+F has a different exception specifier";
1215 bool complained = true;
1216 if (! DECL_IN_SYSTEM_HEADER (old_decl))
1217 error (msg, new_decl);
1219 complained = pedwarn (0, OPT_Wsystem_headers, msg, new_decl);
1221 inform (0, "from previous declaration %q+F", old_decl);
1225 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1226 Otherwise issue diagnostics. */
1229 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1231 old_decl = STRIP_TEMPLATE (old_decl);
1232 new_decl = STRIP_TEMPLATE (new_decl);
1233 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1234 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1236 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1237 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1239 if (TREE_CODE (old_decl) == FUNCTION_DECL)
1241 if (DECL_BUILT_IN (old_decl))
1243 /* Hide a built-in declaration. */
1244 DECL_DECLARED_CONSTEXPR_P (old_decl)
1245 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1248 /* 7.1.5 [dcl.constexpr]
1249 Note: An explicit specialization can differ from the template
1250 declaration with respect to the constexpr specifier. */
1251 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl)
1252 && DECL_TEMPLATE_SPECIALIZATION (new_decl))
1255 error ("redeclaration %q+D differs in %<constexpr%>", new_decl);
1256 error ("from previous declaration %q+D", old_decl);
1262 // If OLDDECL and NEWDECL are concept declarations with the same type
1263 // (i.e., and template parameters), but different requirements,
1264 // emit diagnostics and return true. Otherwise, return false.
1266 check_concept_refinement (tree olddecl, tree newdecl)
1268 if (!DECL_DECLARED_CONCEPT_P (olddecl) || !DECL_DECLARED_CONCEPT_P (newdecl))
1271 tree d1 = DECL_TEMPLATE_RESULT (olddecl);
1272 tree d2 = DECL_TEMPLATE_RESULT (newdecl);
1273 if (TREE_CODE (d1) != TREE_CODE (d2))
1276 tree t1 = TREE_TYPE (d1);
1277 tree t2 = TREE_TYPE (d2);
1278 if (TREE_CODE (d1) == FUNCTION_DECL)
1280 if (compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2))
1281 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl),
1282 DECL_TEMPLATE_PARMS (newdecl))
1283 && !equivalently_constrained (olddecl, newdecl))
1285 error ("cannot specialize concept %q#D", olddecl);
1292 /* DECL is a redeclaration of a function or function template. If
1293 it does have default arguments issue a diagnostic. Note: this
1294 function is used to enforce the requirements in C++11 8.3.6 about
1295 no default arguments in redeclarations. */
1298 check_redeclaration_no_default_args (tree decl)
1300 gcc_assert (DECL_DECLARES_FUNCTION_P (decl));
1302 for (tree t = FUNCTION_FIRST_USER_PARMTYPE (decl);
1303 t && t != void_list_node; t = TREE_CHAIN (t))
1304 if (TREE_PURPOSE (t))
1306 permerror (DECL_SOURCE_LOCATION (decl),
1307 "redeclaration of %q#D may not have default "
1313 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1314 && lookup_attribute ("gnu_inline", \
1315 DECL_ATTRIBUTES (fn)))
1317 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1318 If the redeclaration is invalid, a diagnostic is issued, and the
1319 error_mark_node is returned. Otherwise, OLDDECL is returned.
1321 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1324 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1327 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1329 unsigned olddecl_uid = DECL_UID (olddecl);
1330 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1331 int new_defines_function = 0;
1332 tree new_template_info;
1334 if (newdecl == olddecl)
1337 types_match = decls_match (newdecl, olddecl);
1339 /* If either the type of the new decl or the type of the old decl is an
1340 error_mark_node, then that implies that we have already issued an
1341 error (earlier) for some bogus type specification, and in that case,
1342 it is rather pointless to harass the user with yet more error message
1343 about the same declaration, so just pretend the types match here. */
1344 if (TREE_TYPE (newdecl) == error_mark_node
1345 || TREE_TYPE (olddecl) == error_mark_node)
1346 return error_mark_node;
1348 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1349 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1351 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1352 && TREE_CODE (olddecl) != TEMPLATE_DECL
1353 && check_raw_literal_operator (olddecl))
1354 error ("literal operator template %q+D conflicts with"
1355 " raw literal operator %qD", newdecl, olddecl);
1356 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1357 && TREE_CODE (olddecl) == TEMPLATE_DECL
1358 && check_raw_literal_operator (newdecl))
1359 error ("raw literal operator %q+D conflicts with"
1360 " literal operator template %qD", newdecl, olddecl);
1363 if (DECL_P (olddecl)
1364 && TREE_CODE (newdecl) == FUNCTION_DECL
1365 && TREE_CODE (olddecl) == FUNCTION_DECL
1366 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1368 if (DECL_DECLARED_INLINE_P (newdecl)
1369 && DECL_UNINLINABLE (newdecl)
1370 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1371 /* Already warned elsewhere. */;
1372 else if (DECL_DECLARED_INLINE_P (olddecl)
1373 && DECL_UNINLINABLE (olddecl)
1374 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1375 /* Already warned. */;
1376 else if (DECL_DECLARED_INLINE_P (newdecl)
1377 && DECL_UNINLINABLE (olddecl)
1378 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1380 if (warning_at (DECL_SOURCE_LOCATION (newdecl),
1381 OPT_Wattributes, "function %qD redeclared as inline",
1383 inform (DECL_SOURCE_LOCATION (olddecl),
1384 "previous declaration of %qD with attribute noinline",
1387 else if (DECL_DECLARED_INLINE_P (olddecl)
1388 && DECL_UNINLINABLE (newdecl)
1389 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1391 if (warning_at (DECL_SOURCE_LOCATION (newdecl),
1392 OPT_Wattributes, "function %qD redeclared with "
1393 "attribute noinline", newdecl))
1394 inform (DECL_SOURCE_LOCATION (olddecl),
1395 "previous declaration of %qD was inline",
1400 /* Check for redeclaration and other discrepancies. */
1401 if (TREE_CODE (olddecl) == FUNCTION_DECL
1402 && DECL_ARTIFICIAL (olddecl))
1404 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1405 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1407 /* Avoid warnings redeclaring built-ins which have not been
1408 explicitly declared. */
1409 if (DECL_ANTICIPATED (olddecl))
1412 /* If you declare a built-in or predefined function name as static,
1413 the old definition is overridden, but optionally warn this was a
1414 bad choice of name. */
1415 if (! TREE_PUBLIC (newdecl))
1417 warning (OPT_Wshadow,
1418 DECL_BUILT_IN (olddecl)
1419 ? G_("shadowing built-in function %q#D")
1420 : G_("shadowing library function %q#D"), olddecl);
1421 /* Discard the old built-in function. */
1424 /* If the built-in is not ansi, then programs can override
1425 it even globally without an error. */
1426 else if (! DECL_BUILT_IN (olddecl))
1427 warning_at (DECL_SOURCE_LOCATION (newdecl), 0,
1428 "library function %q#D redeclared as non-function %q#D",
1431 error ("declaration of %q+#D conflicts with built-in "
1432 "declaration %q#D", newdecl, olddecl);
1435 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl))
1437 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl));
1438 error_at (DECL_SOURCE_LOCATION (newdecl),
1439 "redeclaration of %<pragma omp declare reduction%>");
1440 inform (DECL_SOURCE_LOCATION (olddecl),
1441 "previous %<pragma omp declare reduction%> declaration");
1442 return error_mark_node;
1444 else if (!types_match)
1446 /* Avoid warnings redeclaring built-ins which have not been
1447 explicitly declared. */
1448 if (DECL_ANTICIPATED (olddecl))
1450 /* Deal with fileptr_type_node. FILE type is not known
1451 at the time we create the builtins. */
1454 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1455 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1457 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1460 else if (TREE_VALUE (t2) == fileptr_type_node)
1462 tree t = TREE_VALUE (t1);
1465 && TYPE_IDENTIFIER (TREE_TYPE (t))
1466 == get_identifier ("FILE")
1467 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1469 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1471 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1472 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1473 types_match = decls_match (newdecl, olddecl);
1475 return duplicate_decls (newdecl, olddecl,
1477 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1480 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1483 else if ((DECL_EXTERN_C_P (newdecl)
1484 && DECL_EXTERN_C_P (olddecl))
1485 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1486 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1488 /* A near match; override the builtin. */
1490 if (TREE_PUBLIC (newdecl))
1491 warning_at (DECL_SOURCE_LOCATION (newdecl), 0,
1492 "new declaration %q#D ambiguates built-in "
1493 "declaration %q#D", newdecl, olddecl);
1495 warning (OPT_Wshadow,
1496 DECL_BUILT_IN (olddecl)
1497 ? G_("shadowing built-in function %q#D")
1498 : G_("shadowing library function %q#D"), olddecl);
1501 /* Discard the old built-in function. */
1504 /* Replace the old RTL to avoid problems with inlining. */
1505 COPY_DECL_RTL (newdecl, olddecl);
1507 /* Even if the types match, prefer the new declarations type for
1508 built-ins which have not been explicitly declared, for
1509 exception lists, etc... */
1510 else if (DECL_IS_BUILTIN (olddecl))
1512 tree type = TREE_TYPE (newdecl);
1513 tree attribs = (*targetm.merge_type_attributes)
1514 (TREE_TYPE (olddecl), type);
1516 type = cp_build_type_attribute_variant (type, attribs);
1517 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1520 /* If a function is explicitly declared "throw ()", propagate that to
1521 the corresponding builtin. */
1522 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1523 && DECL_ANTICIPATED (olddecl)
1524 && TREE_NOTHROW (newdecl)
1525 && !TREE_NOTHROW (olddecl))
1527 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1528 tree tmpdecl = builtin_decl_explicit (fncode);
1529 if (tmpdecl && tmpdecl != olddecl && types_match)
1530 TREE_NOTHROW (tmpdecl) = 1;
1533 /* Whether or not the builtin can throw exceptions has no
1534 bearing on this declarator. */
1535 TREE_NOTHROW (olddecl) = 0;
1537 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1539 /* If a builtin function is redeclared as `static', merge
1540 the declarations, but make the original one static. */
1541 DECL_THIS_STATIC (olddecl) = 1;
1542 TREE_PUBLIC (olddecl) = 0;
1544 /* Make the old declaration consistent with the new one so
1545 that all remnants of the builtin-ness of this function
1546 will be banished. */
1547 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1548 COPY_DECL_RTL (newdecl, olddecl);
1551 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1553 /* C++ Standard, 3.3, clause 4:
1554 "[Note: a namespace name or a class template name must be unique
1555 in its declarative region (7.3.2, clause 14). ]" */
1556 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1557 && TREE_CODE (newdecl) != NAMESPACE_DECL
1558 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1559 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1560 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1561 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1563 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1564 && TREE_CODE (newdecl) != TYPE_DECL)
1565 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1566 && TREE_CODE (olddecl) != TYPE_DECL))
1568 /* We do nothing special here, because C++ does such nasty
1569 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1570 get shadowed, and know that if we need to find a TYPE_DECL
1571 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1572 slot of the identifier. */
1576 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1577 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1578 || (TREE_CODE (olddecl) == FUNCTION_DECL
1579 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1583 error ("%q#D redeclared as different kind of symbol", newdecl);
1584 if (TREE_CODE (olddecl) == TREE_LIST)
1585 olddecl = TREE_VALUE (olddecl);
1586 inform (DECL_SOURCE_LOCATION (olddecl),
1587 "previous declaration %q#D", olddecl);
1589 return error_mark_node;
1591 else if (!types_match)
1593 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1594 /* These are certainly not duplicate declarations; they're
1595 from different scopes. */
1598 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1600 /* The name of a class template may not be declared to refer to
1601 any other template, class, function, object, namespace, value,
1602 or type in the same scope. */
1603 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1604 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1606 error ("conflicting declaration of template %q+#D", newdecl);
1607 inform (DECL_SOURCE_LOCATION (olddecl),
1608 "previous declaration %q#D", olddecl);
1609 return error_mark_node;
1611 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1612 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1613 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1614 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1615 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1616 DECL_TEMPLATE_PARMS (olddecl))
1617 /* Template functions can be disambiguated by
1619 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1620 TREE_TYPE (TREE_TYPE (olddecl)))
1621 // Template functions can also be disambiguated by
1623 && equivalently_constrained (olddecl, newdecl))
1625 error ("ambiguating new declaration %q+#D", newdecl);
1626 inform (DECL_SOURCE_LOCATION (olddecl),
1627 "old declaration %q#D", olddecl);
1629 else if (check_concept_refinement (olddecl, newdecl))
1630 return error_mark_node;
1633 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1635 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1637 error ("conflicting declaration of C function %q+#D",
1639 inform (DECL_SOURCE_LOCATION (olddecl),
1640 "previous declaration %q#D", olddecl);
1643 /* For function versions, params and types match, but they
1644 are not ambiguous. */
1645 else if ((!DECL_FUNCTION_VERSIONED (newdecl)
1646 && !DECL_FUNCTION_VERSIONED (olddecl))
1647 // The functions have the same parameter types.
1648 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1649 TYPE_ARG_TYPES (TREE_TYPE (olddecl)))
1650 // And the same constraints.
1651 && equivalently_constrained (newdecl, olddecl))
1653 error ("ambiguating new declaration of %q+#D", newdecl);
1654 inform (DECL_SOURCE_LOCATION (olddecl),
1655 "old declaration %q#D", olddecl);
1656 return error_mark_node;
1663 error ("conflicting declaration %q+#D", newdecl);
1664 inform (DECL_SOURCE_LOCATION (olddecl),
1665 "previous declaration as %q#D", olddecl);
1666 return error_mark_node;
1669 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1670 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1671 && (!DECL_TEMPLATE_INFO (newdecl)
1672 || (DECL_TI_TEMPLATE (newdecl)
1673 != DECL_TI_TEMPLATE (olddecl))))
1674 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1675 && (!DECL_TEMPLATE_INFO (olddecl)
1676 || (DECL_TI_TEMPLATE (olddecl)
1677 != DECL_TI_TEMPLATE (newdecl))))))
1678 /* It's OK to have a template specialization and a non-template
1679 with the same type, or to have specializations of two
1680 different templates with the same type. Note that if one is a
1681 specialization, and the other is an instantiation of the same
1682 template, that we do not exit at this point. That situation
1683 can occur if we instantiate a template class, and then
1684 specialize one of its methods. This situation is valid, but
1685 the declarations must be merged in the usual way. */
1687 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1688 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1689 && !DECL_USE_TEMPLATE (newdecl))
1690 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1691 && !DECL_USE_TEMPLATE (olddecl))))
1692 /* One of the declarations is a template instantiation, and the
1693 other is not a template at all. That's OK. */
1695 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1697 /* In [namespace.alias] we have:
1699 In a declarative region, a namespace-alias-definition can be
1700 used to redefine a namespace-alias declared in that declarative
1701 region to refer only to the namespace to which it already
1704 Therefore, if we encounter a second alias directive for the same
1705 alias, we can just ignore the second directive. */
1706 if (DECL_NAMESPACE_ALIAS (newdecl)
1707 && (DECL_NAMESPACE_ALIAS (newdecl)
1708 == DECL_NAMESPACE_ALIAS (olddecl)))
1710 /* [namespace.alias]
1712 A namespace-name or namespace-alias shall not be declared as
1713 the name of any other entity in the same declarative region.
1714 A namespace-name defined at global scope shall not be
1715 declared as the name of any other entity in any global scope
1717 error ("conflicting declaration of namespace %q+D", newdecl);
1718 inform (DECL_SOURCE_LOCATION (olddecl),
1719 "previous declaration of namespace %qD here", olddecl);
1720 return error_mark_node;
1724 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1727 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1728 if (DECL_NAME (olddecl) != NULL_TREE)
1729 inform (DECL_SOURCE_LOCATION (olddecl),
1730 (DECL_INITIAL (olddecl) && namespace_bindings_p ())
1731 ? G_("%q#D previously defined here")
1732 : G_("%q#D previously declared here"), olddecl);
1733 return error_mark_node;
1735 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1736 && DECL_INITIAL (olddecl) != NULL_TREE
1737 && !prototype_p (TREE_TYPE (olddecl))
1738 && prototype_p (TREE_TYPE (newdecl)))
1740 /* Prototype decl follows defn w/o prototype. */
1741 if (warning_at (DECL_SOURCE_LOCATION (newdecl), 0,
1742 "prototype specified for %q#D", newdecl))
1743 inform (DECL_SOURCE_LOCATION (olddecl),
1744 "previous non-prototype definition here");
1746 else if (VAR_OR_FUNCTION_DECL_P (olddecl)
1747 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1750 If two declarations of the same function or object
1751 specify different linkage-specifications ..., the program
1752 is ill-formed.... Except for functions with C++ linkage,
1753 a function declaration without a linkage specification
1754 shall not precede the first linkage specification for
1755 that function. A function can be declared without a
1756 linkage specification after an explicit linkage
1757 specification has been seen; the linkage explicitly
1758 specified in the earlier declaration is not affected by
1759 such a function declaration.
1761 DR 563 raises the question why the restrictions on
1762 functions should not also apply to objects. Older
1763 versions of G++ silently ignore the linkage-specification
1771 which is clearly wrong. Therefore, we now treat objects
1773 if (current_lang_depth () == 0)
1775 /* There is no explicit linkage-specification, so we use
1776 the linkage from the previous declaration. */
1777 if (!DECL_LANG_SPECIFIC (newdecl))
1778 retrofit_lang_decl (newdecl);
1779 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1783 error ("conflicting declaration of %q+#D with %qL linkage",
1784 newdecl, DECL_LANGUAGE (newdecl));
1785 inform (DECL_SOURCE_LOCATION (olddecl),
1786 "previous declaration with %qL linkage",
1787 DECL_LANGUAGE (olddecl));
1791 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1793 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1795 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1796 if (DECL_FUNCTION_MEMBER_P (olddecl)
1797 && (/* grokfndecl passes member function templates too
1798 as FUNCTION_DECLs. */
1799 DECL_TEMPLATE_INFO (olddecl)
1801 Default arguments for a member function of a class
1802 template shall be specified on the initial declaration
1803 of the member function within the class template. */
1804 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl))))
1805 check_redeclaration_no_default_args (newdecl);
1808 tree t1 = FUNCTION_FIRST_USER_PARMTYPE (olddecl);
1809 tree t2 = FUNCTION_FIRST_USER_PARMTYPE (newdecl);
1812 for (; t1 && t1 != void_list_node;
1813 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1814 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1816 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1819 if (permerror (input_location,
1820 "default argument given for parameter "
1821 "%d of %q#D", i, newdecl))
1822 inform (DECL_SOURCE_LOCATION (olddecl),
1823 "previous specification in %q#D here",
1828 error ("default argument given for parameter %d "
1829 "of %q#D", i, newdecl);
1830 inform (DECL_SOURCE_LOCATION (olddecl),
1831 "previous specification in %q#D here",
1839 /* Do not merge an implicit typedef with an explicit one. In:
1843 typedef class A A __attribute__ ((foo));
1845 the attribute should apply only to the typedef. */
1846 if (TREE_CODE (olddecl) == TYPE_DECL
1847 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1848 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1851 /* If new decl is `static' and an `extern' was seen previously,
1853 warn_extern_redeclared_static (newdecl, olddecl);
1855 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1856 return error_mark_node;
1858 /* We have committed to returning 1 at this point. */
1859 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1861 /* Now that functions must hold information normally held
1862 by field decls, there is extra work to do so that
1863 declaration information does not get destroyed during
1865 if (DECL_VINDEX (olddecl))
1866 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1867 if (DECL_CONTEXT (olddecl))
1868 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1869 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1870 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1871 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1872 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1873 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1874 DECL_FINAL_P (newdecl) |= DECL_FINAL_P (olddecl);
1875 DECL_OVERRIDE_P (newdecl) |= DECL_OVERRIDE_P (olddecl);
1876 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1877 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1878 SET_OVERLOADED_OPERATOR_CODE
1879 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1880 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1882 /* Optionally warn about more than one declaration for the same
1883 name, but don't warn about a function declaration followed by a
1885 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1886 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1887 /* Don't warn about extern decl followed by definition. */
1888 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1889 /* Don't warn about friends, let add_friend take care of it. */
1890 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl))
1891 /* Don't warn about declaration followed by specialization. */
1892 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl)
1893 || DECL_TEMPLATE_SPECIALIZATION (olddecl)))
1895 if (warning_at (DECL_SOURCE_LOCATION (newdecl),
1896 OPT_Wredundant_decls,
1897 "redundant redeclaration of %qD in same scope",
1899 inform (DECL_SOURCE_LOCATION (olddecl),
1900 "previous declaration of %qD", olddecl);
1903 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl)
1904 && DECL_TEMPLATE_SPECIALIZATION (newdecl)))
1906 if (DECL_DELETED_FN (newdecl))
1908 error ("deleted definition of %q+D", newdecl);
1909 inform (DECL_SOURCE_LOCATION (olddecl),
1910 "previous declaration of %qD", olddecl);
1912 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1916 /* Deal with C++: must preserve virtual function table size. */
1917 if (TREE_CODE (olddecl) == TYPE_DECL)
1919 tree newtype = TREE_TYPE (newdecl);
1920 tree oldtype = TREE_TYPE (olddecl);
1922 if (newtype != error_mark_node && oldtype != error_mark_node
1923 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1924 CLASSTYPE_FRIEND_CLASSES (newtype)
1925 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1927 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1930 /* Copy all the DECL_... slots specified in the new decl
1931 except for any that we copy here from the old type. */
1932 DECL_ATTRIBUTES (newdecl)
1933 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1935 if (DECL_DECLARES_FUNCTION_P (olddecl) && DECL_DECLARES_FUNCTION_P (newdecl))
1937 olddecl_friend = DECL_FRIEND_P (olddecl);
1938 hidden_friend = (DECL_ANTICIPATED (olddecl)
1939 && DECL_HIDDEN_FRIEND_P (olddecl)
1940 && newdecl_is_friend);
1943 DECL_ANTICIPATED (olddecl) = 0;
1944 DECL_HIDDEN_FRIEND_P (olddecl) = 0;
1948 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1952 old_result = DECL_TEMPLATE_RESULT (olddecl);
1953 new_result = DECL_TEMPLATE_RESULT (newdecl);
1954 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1955 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1956 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1957 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1959 DECL_ATTRIBUTES (old_result)
1960 = (*targetm.merge_decl_attributes) (old_result, new_result);
1962 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1964 /* Per C++11 8.3.6/4, default arguments cannot be added in later
1965 declarations of a function template. */
1966 if (DECL_SOURCE_LOCATION (newdecl)
1967 != DECL_SOURCE_LOCATION (olddecl))
1968 check_redeclaration_no_default_args (newdecl);
1970 check_default_args (newdecl);
1972 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1973 && DECL_INITIAL (new_result))
1975 if (DECL_INITIAL (old_result))
1976 DECL_UNINLINABLE (old_result) = 1;
1978 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1979 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1980 DECL_NOT_REALLY_EXTERN (old_result)
1981 = DECL_NOT_REALLY_EXTERN (new_result);
1982 DECL_INTERFACE_KNOWN (old_result)
1983 = DECL_INTERFACE_KNOWN (new_result);
1984 DECL_DECLARED_INLINE_P (old_result)
1985 = DECL_DECLARED_INLINE_P (new_result);
1986 DECL_DISREGARD_INLINE_LIMITS (old_result)
1987 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1992 DECL_DECLARED_INLINE_P (old_result)
1993 |= DECL_DECLARED_INLINE_P (new_result);
1994 DECL_DISREGARD_INLINE_LIMITS (old_result)
1995 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1996 check_redeclaration_exception_specification (newdecl, olddecl);
2000 /* If the new declaration is a definition, update the file and
2001 line information on the declaration, and also make
2002 the old declaration the same definition. */
2003 if (DECL_INITIAL (new_result) != NULL_TREE)
2005 DECL_SOURCE_LOCATION (olddecl)
2006 = DECL_SOURCE_LOCATION (old_result)
2007 = DECL_SOURCE_LOCATION (newdecl);
2008 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
2009 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
2012 DECL_ARGUMENTS (old_result)
2013 = DECL_ARGUMENTS (new_result);
2014 for (parm = DECL_ARGUMENTS (old_result); parm;
2015 parm = DECL_CHAIN (parm))
2016 DECL_CONTEXT (parm) = old_result;
2025 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2026 check_redeclaration_exception_specification (newdecl, olddecl);
2028 /* Automatically handles default parameters. */
2029 tree oldtype = TREE_TYPE (olddecl);
2032 /* For typedefs use the old type, as the new type's DECL_NAME points
2033 at newdecl, which will be ggc_freed. */
2034 if (TREE_CODE (newdecl) == TYPE_DECL)
2038 /* And remove the new type from the variants list. */
2039 if (TYPE_NAME (TREE_TYPE (newdecl)) == newdecl)
2041 tree remove = TREE_TYPE (newdecl);
2042 for (tree t = TYPE_MAIN_VARIANT (remove); ;
2043 t = TYPE_NEXT_VARIANT (t))
2044 if (TYPE_NEXT_VARIANT (t) == remove)
2046 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (remove);
2052 /* Merge the data types specified in the two decls. */
2053 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
2055 if (VAR_P (newdecl))
2057 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
2058 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
2059 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
2060 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
2061 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
2062 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
2064 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2065 if (DECL_LANG_SPECIFIC (olddecl)
2066 && CP_DECL_THREADPRIVATE_P (olddecl))
2068 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2069 if (!DECL_LANG_SPECIFIC (newdecl))
2070 retrofit_lang_decl (newdecl);
2072 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
2076 /* An explicit specialization of a function template or of a member
2077 function of a class template can be declared transaction_safe
2078 independently of whether the corresponding template entity is declared
2079 transaction_safe. */
2080 if (flag_tm && TREE_CODE (newdecl) == FUNCTION_DECL
2081 && DECL_TEMPLATE_INSTANTIATION (olddecl)
2082 && DECL_TEMPLATE_SPECIALIZATION (newdecl)
2083 && tx_safe_fn_type_p (newtype)
2084 && !tx_safe_fn_type_p (TREE_TYPE (newdecl)))
2085 newtype = tx_unsafe_fn_variant (newtype);
2087 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
2089 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2090 check_default_args (newdecl);
2092 /* Lay the type out, unless already done. */
2093 if (! same_type_p (newtype, oldtype)
2094 && TREE_TYPE (newdecl) != error_mark_node
2095 && !(processing_template_decl && uses_template_parms (newdecl)))
2096 layout_type (TREE_TYPE (newdecl));
2098 if ((VAR_P (newdecl)
2099 || TREE_CODE (newdecl) == PARM_DECL
2100 || TREE_CODE (newdecl) == RESULT_DECL
2101 || TREE_CODE (newdecl) == FIELD_DECL
2102 || TREE_CODE (newdecl) == TYPE_DECL)
2103 && !(processing_template_decl && uses_template_parms (newdecl)))
2104 layout_decl (newdecl, 0);
2106 /* Merge the type qualifiers. */
2107 if (TREE_READONLY (newdecl))
2108 TREE_READONLY (olddecl) = 1;
2109 if (TREE_THIS_VOLATILE (newdecl))
2110 TREE_THIS_VOLATILE (olddecl) = 1;
2111 if (TREE_NOTHROW (newdecl))
2112 TREE_NOTHROW (olddecl) = 1;
2114 /* Merge deprecatedness. */
2115 if (TREE_DEPRECATED (newdecl))
2116 TREE_DEPRECATED (olddecl) = 1;
2118 /* Preserve function specific target and optimization options */
2119 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2121 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2122 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2123 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2124 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2126 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2127 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2128 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2129 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2132 /* Merge the initialization information. */
2133 if (DECL_INITIAL (newdecl) == NULL_TREE
2134 && DECL_INITIAL (olddecl) != NULL_TREE)
2136 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2137 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2138 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2140 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2141 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2145 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2147 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2148 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2149 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2150 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2151 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
2152 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2153 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2154 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2155 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2156 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
2157 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
2158 /* Keep the old RTL. */
2159 COPY_DECL_RTL (olddecl, newdecl);
2161 else if (VAR_P (newdecl)
2162 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
2164 /* Keep the old RTL. We cannot keep the old RTL if the old
2165 declaration was for an incomplete object and the new
2166 declaration is not since many attributes of the RTL will
2168 COPY_DECL_RTL (olddecl, newdecl);
2171 /* If cannot merge, then use the new type and qualifiers,
2172 and don't preserve the old rtl. */
2175 /* Clean out any memory we had of the old declaration. */
2176 tree oldstatic = value_member (olddecl, static_aggregates);
2178 TREE_VALUE (oldstatic) = error_mark_node;
2180 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2181 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
2182 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
2183 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
2186 /* Merge the storage class information. */
2187 merge_weak (newdecl, olddecl);
2189 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
2190 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2191 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
2192 if (! DECL_EXTERNAL (olddecl))
2193 DECL_EXTERNAL (newdecl) = 0;
2194 if (! DECL_COMDAT (olddecl))
2195 DECL_COMDAT (newdecl) = 0;
2197 new_template_info = NULL_TREE;
2198 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
2200 bool new_redefines_gnu_inline = false;
2202 if (new_defines_function
2203 && ((DECL_INTERFACE_KNOWN (olddecl)
2204 && TREE_CODE (olddecl) == FUNCTION_DECL)
2205 || (TREE_CODE (olddecl) == TEMPLATE_DECL
2206 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
2207 == FUNCTION_DECL))))
2211 if (TREE_CODE (fn) == TEMPLATE_DECL)
2212 fn = DECL_TEMPLATE_RESULT (olddecl);
2214 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
2217 if (!new_redefines_gnu_inline)
2219 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
2220 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
2221 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
2223 DECL_TEMPLATE_INSTANTIATED (newdecl)
2224 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
2225 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
2227 /* If the OLDDECL is an instantiation and/or specialization,
2228 then the NEWDECL must be too. But, it may not yet be marked
2229 as such if the caller has created NEWDECL, but has not yet
2230 figured out that it is a redeclaration. */
2231 if (!DECL_USE_TEMPLATE (newdecl))
2232 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
2234 /* Don't really know how much of the language-specific
2235 values we should copy from old to new. */
2236 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2237 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2238 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2239 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2241 if (LANG_DECL_HAS_MIN (newdecl))
2243 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2244 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2245 if (DECL_TEMPLATE_INFO (newdecl))
2247 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2248 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2249 && DECL_TEMPLATE_SPECIALIZATION (newdecl))
2250 /* Remember the presence of explicit specialization args. */
2251 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl))
2252 = TINFO_USED_TEMPLATE_ID (new_template_info);
2254 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2256 /* Only functions have these fields. */
2257 if (DECL_DECLARES_FUNCTION_P (newdecl))
2259 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2260 DECL_BEFRIENDING_CLASSES (newdecl)
2261 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2262 DECL_BEFRIENDING_CLASSES (olddecl));
2263 /* DECL_THUNKS is only valid for virtual functions,
2264 otherwise it is a DECL_FRIEND_CONTEXT. */
2265 if (DECL_VIRTUAL_P (newdecl))
2266 SET_DECL_THUNKS (newdecl, DECL_THUNKS (olddecl));
2268 /* Only variables have this field. */
2269 else if (VAR_P (newdecl)
2270 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2271 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2274 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2278 /* Merge parameter attributes. */
2279 tree oldarg, newarg;
2280 for (oldarg = DECL_ARGUMENTS(olddecl),
2281 newarg = DECL_ARGUMENTS(newdecl);
2283 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2284 DECL_ATTRIBUTES (newarg)
2285 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2286 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2289 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2290 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2292 /* If newdecl is not a specialization, then it is not a
2293 template-related function at all. And that means that we
2294 should have exited above, returning 0. */
2295 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2297 if (DECL_ODR_USED (olddecl))
2298 /* From [temp.expl.spec]:
2300 If a template, a member template or the member of a class
2301 template is explicitly specialized then that
2302 specialization shall be declared before the first use of
2303 that specialization that would cause an implicit
2304 instantiation to take place, in every translation unit in
2305 which such a use occurs. */
2306 error ("explicit specialization of %qD after first use",
2309 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2310 DECL_COMDAT (newdecl) = (TREE_PUBLIC (newdecl)
2311 && DECL_DECLARED_INLINE_P (newdecl));
2313 /* Don't propagate visibility from the template to the
2314 specialization here. We'll do that in determine_visibility if
2316 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2318 /* [temp.expl.spec/14] We don't inline explicit specialization
2319 just because the primary template says so. */
2321 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2322 the always_inline attribute. */
2323 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2324 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2326 if (DECL_DECLARED_INLINE_P (newdecl))
2327 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2329 DECL_ATTRIBUTES (newdecl)
2330 = remove_attribute ("always_inline",
2331 DECL_ATTRIBUTES (newdecl));
2334 else if (new_defines_function && DECL_INITIAL (olddecl))
2336 /* Never inline re-defined extern inline functions.
2337 FIXME: this could be better handled by keeping both
2338 function as separate declarations. */
2339 DECL_UNINLINABLE (newdecl) = 1;
2343 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2344 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2346 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2348 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2349 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2351 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2352 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2353 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2354 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2357 /* Preserve abstractness on cloned [cd]tors. */
2358 DECL_ABSTRACT_P (newdecl) = DECL_ABSTRACT_P (olddecl);
2360 /* Update newdecl's parms to point at olddecl. */
2361 for (parm = DECL_ARGUMENTS (newdecl); parm;
2362 parm = DECL_CHAIN (parm))
2363 DECL_CONTEXT (parm) = olddecl;
2367 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2368 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2369 COPY_DECL_RTL (newdecl, olddecl);
2371 if (! types_match || new_defines_function)
2373 /* These need to be copied so that the names are available.
2374 Note that if the types do match, we'll preserve inline
2375 info and other bits, but if not, we won't. */
2376 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2377 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2379 /* If redeclaring a builtin function, it stays built in
2380 if newdecl is a gnu_inline definition, or if newdecl is just
2382 if (DECL_BUILT_IN (olddecl)
2383 && (new_defines_function ? GNU_INLINE_P (newdecl) : types_match))
2385 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2386 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2387 /* If we're keeping the built-in definition, keep the rtl,
2388 regardless of declaration matches. */
2389 COPY_DECL_RTL (olddecl, newdecl);
2390 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2392 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2395 /* If a compatible prototype of these builtin functions
2396 is seen, assume the runtime implements it with the
2397 expected semantics. */
2398 case BUILT_IN_STPCPY:
2399 if (builtin_decl_explicit_p (fncode))
2400 set_builtin_decl_implicit_p (fncode, true);
2403 if (builtin_decl_explicit_p (fncode))
2404 set_builtin_decl_declared_p (fncode, true);
2409 if (new_defines_function)
2410 /* If defining a function declared with other language
2411 linkage, use the previously declared language linkage. */
2412 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2413 else if (types_match)
2415 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2416 /* Don't clear out the arguments if we're just redeclaring a
2418 if (DECL_ARGUMENTS (olddecl))
2419 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2422 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2423 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2425 /* Now preserve various other info from the definition. */
2426 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2427 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2428 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2429 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2431 /* Warn about conflicting visibility specifications. */
2432 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2433 && DECL_VISIBILITY_SPECIFIED (newdecl)
2434 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2436 if (warning_at (DECL_SOURCE_LOCATION (newdecl), OPT_Wattributes,
2437 "%qD: visibility attribute ignored because it "
2438 "conflicts with previous declaration", newdecl))
2439 inform (DECL_SOURCE_LOCATION (olddecl),
2440 "previous declaration of %qD", olddecl);
2442 /* Choose the declaration which specified visibility. */
2443 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2445 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2446 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2448 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2449 so keep this behavior. */
2450 if (VAR_P (newdecl) && DECL_HAS_INIT_PRIORITY_P (newdecl))
2452 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2453 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2455 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2456 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2458 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2459 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2461 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2462 if (TREE_CODE (newdecl) == FIELD_DECL)
2463 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2465 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2466 with that from NEWDECL below. */
2467 if (DECL_LANG_SPECIFIC (olddecl))
2469 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2470 != DECL_LANG_SPECIFIC (newdecl));
2471 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2474 /* Merge the USED information. */
2475 if (TREE_USED (olddecl))
2476 TREE_USED (newdecl) = 1;
2477 else if (TREE_USED (newdecl))
2478 TREE_USED (olddecl) = 1;
2479 if (VAR_P (newdecl))
2481 if (DECL_READ_P (olddecl))
2482 DECL_READ_P (newdecl) = 1;
2483 else if (DECL_READ_P (newdecl))
2484 DECL_READ_P (olddecl) = 1;
2486 if (DECL_PRESERVE_P (olddecl))
2487 DECL_PRESERVE_P (newdecl) = 1;
2488 else if (DECL_PRESERVE_P (newdecl))
2489 DECL_PRESERVE_P (olddecl) = 1;
2491 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2492 to olddecl and deleted. */
2493 if (TREE_CODE (newdecl) == FUNCTION_DECL
2494 && DECL_FUNCTION_VERSIONED (olddecl))
2496 /* Set the flag for newdecl so that it gets copied to olddecl. */
2497 DECL_FUNCTION_VERSIONED (newdecl) = 1;
2498 /* newdecl will be purged after copying to olddecl and is no longer
2500 cgraph_node::delete_function_version (newdecl);
2503 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2506 struct symtab_node *snode = symtab_node::get (olddecl);
2508 function_size = sizeof (struct tree_decl_common);
2510 memcpy ((char *) olddecl + sizeof (struct tree_common),
2511 (char *) newdecl + sizeof (struct tree_common),
2512 function_size - sizeof (struct tree_common));
2514 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2515 (char *) newdecl + sizeof (struct tree_decl_common),
2516 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2518 /* Preserve symtab node mapping. */
2519 olddecl->decl_with_vis.symtab_node = snode;
2521 if (new_template_info)
2522 /* If newdecl is a template instantiation, it is possible that
2523 the following sequence of events has occurred:
2525 o A friend function was declared in a class template. The
2526 class template was instantiated.
2528 o The instantiation of the friend declaration was
2529 recorded on the instantiation list, and is newdecl.
2531 o Later, however, instantiate_class_template called pushdecl
2532 on the newdecl to perform name injection. But, pushdecl in
2533 turn called duplicate_decls when it discovered that another
2534 declaration of a global function with the same name already
2537 o Here, in duplicate_decls, we decided to clobber newdecl.
2539 If we're going to do that, we'd better make sure that
2540 olddecl, and not newdecl, is on the list of
2541 instantiations so that if we try to do the instantiation
2542 again we won't get the clobbered declaration. */
2543 reregister_specialization (newdecl,
2549 size_t size = tree_code_size (TREE_CODE (newdecl));
2551 memcpy ((char *) olddecl + sizeof (struct tree_common),
2552 (char *) newdecl + sizeof (struct tree_common),
2553 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2554 switch (TREE_CODE (newdecl))
2564 struct symtab_node *snode = NULL;
2567 && (TREE_STATIC (olddecl) || TREE_PUBLIC (olddecl)
2568 || DECL_EXTERNAL (olddecl)))
2569 snode = symtab_node::get (olddecl);
2570 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2571 (char *) newdecl + sizeof (struct tree_decl_common),
2572 size - sizeof (struct tree_decl_common)
2573 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2574 if (VAR_P (newdecl))
2575 olddecl->decl_with_vis.symtab_node = snode;
2579 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2580 (char *) newdecl + sizeof (struct tree_decl_common),
2581 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2582 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2587 if (VAR_OR_FUNCTION_DECL_P (newdecl))
2589 if (DECL_EXTERNAL (olddecl)
2590 || TREE_PUBLIC (olddecl)
2591 || TREE_STATIC (olddecl))
2593 /* Merge the section attribute.
2594 We want to issue an error if the sections conflict but that must be
2595 done later in decl_attributes since we are called before attributes
2597 if (DECL_SECTION_NAME (newdecl) != NULL)
2598 set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl));
2600 if (DECL_ONE_ONLY (newdecl))
2602 struct symtab_node *oldsym, *newsym;
2603 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2604 oldsym = cgraph_node::get_create (olddecl);
2606 oldsym = varpool_node::get_create (olddecl);
2607 newsym = symtab_node::get (newdecl);
2608 oldsym->set_comdat_group (newsym->get_comdat_group ());
2613 && CP_DECL_THREAD_LOCAL_P (newdecl))
2615 CP_DECL_THREAD_LOCAL_P (olddecl) = true;
2616 if (!processing_template_decl)
2617 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2621 DECL_UID (olddecl) = olddecl_uid;
2623 DECL_FRIEND_P (olddecl) = 1;
2626 DECL_ANTICIPATED (olddecl) = 1;
2627 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2630 /* NEWDECL contains the merged attribute lists.
2631 Update OLDDECL to be the same. */
2632 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2634 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2635 so that encode_section_info has a chance to look at the new decl
2636 flags and attributes. */
2637 if (DECL_RTL_SET_P (olddecl)
2638 && (TREE_CODE (olddecl) == FUNCTION_DECL
2640 && TREE_STATIC (olddecl))))
2641 make_decl_rtl (olddecl);
2643 /* The NEWDECL will no longer be needed. Because every out-of-class
2644 declaration of a member results in a call to duplicate_decls,
2645 freeing these nodes represents in a significant savings.
2647 Before releasing the node, be sore to remove function from symbol
2648 table that might have been inserted there to record comdat group.
2649 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2650 structure is shared in between newdecl and oldecl. */
2651 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2652 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2653 if (VAR_OR_FUNCTION_DECL_P (newdecl))
2655 struct symtab_node *snode = symtab_node::get (newdecl);
2660 /* Remove the associated constraints for newdecl, if any, before
2661 reclaiming memory. */
2663 remove_constraints (newdecl);
2670 /* Return zero if the declaration NEWDECL is valid
2671 when the declaration OLDDECL (assumed to be for the same name)
2672 has already been seen.
2673 Otherwise return an error message format string with a %s
2674 where the identifier should go. */
2677 redeclaration_error_message (tree newdecl, tree olddecl)
2679 if (TREE_CODE (newdecl) == TYPE_DECL)
2681 /* Because C++ can put things into name space for free,
2682 constructs like "typedef struct foo { ... } foo"
2683 would look like an erroneous redeclaration. */
2684 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2687 return G_("redefinition of %q#D");
2689 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2691 /* If this is a pure function, its olddecl will actually be
2692 the original initialization to `0' (which we force to call
2693 abort()). Don't complain about redefinition in this case. */
2694 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2695 && DECL_INITIAL (olddecl) == NULL_TREE)
2698 /* If both functions come from different namespaces, this is not
2699 a redeclaration - this is a conflict with a used function. */
2700 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2701 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2702 && ! decls_match (olddecl, newdecl))
2703 return G_("%qD conflicts with used function");
2705 /* We'll complain about linkage mismatches in
2706 warn_extern_redeclared_static. */
2708 /* Defining the same name twice is no good. */
2709 if (DECL_INITIAL (olddecl) != NULL_TREE
2710 && DECL_INITIAL (newdecl) != NULL_TREE)
2712 if (DECL_NAME (olddecl) == NULL_TREE)
2713 return G_("%q#D not declared in class");
2714 else if (!GNU_INLINE_P (olddecl)
2715 || GNU_INLINE_P (newdecl))
2716 return G_("redefinition of %q#D");
2719 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2721 bool olda = GNU_INLINE_P (olddecl);
2722 bool newa = GNU_INLINE_P (newdecl);
2727 return G_("%q+D redeclared inline with "
2728 "%<gnu_inline%> attribute");
2730 return G_("%q+D redeclared inline without "
2731 "%<gnu_inline%> attribute");
2735 check_abi_tag_redeclaration
2736 (olddecl, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl)),
2737 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl)));
2741 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2745 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2747 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2748 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2749 return G_("redefinition of %q#D");
2753 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2754 || (DECL_TEMPLATE_RESULT (newdecl)
2755 == DECL_TEMPLATE_RESULT (olddecl)))
2758 nt = DECL_TEMPLATE_RESULT (newdecl);
2759 if (DECL_TEMPLATE_INFO (nt))
2760 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2761 ot = DECL_TEMPLATE_RESULT (olddecl);
2762 if (DECL_TEMPLATE_INFO (ot))
2763 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2764 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2765 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2766 return G_("redefinition of %q#D");
2768 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2770 bool olda = GNU_INLINE_P (ot);
2771 bool newa = GNU_INLINE_P (nt);
2776 return G_("%q+D redeclared inline with "
2777 "%<gnu_inline%> attribute");
2779 return G_("%q+D redeclared inline without "
2780 "%<gnu_inline%> attribute");
2784 /* Core issue #226 (C++0x):
2786 If a friend function template declaration specifies a
2787 default template-argument, that declaration shall be a
2788 definition and shall be the only declaration of the
2789 function template in the translation unit. */
2790 if ((cxx_dialect != cxx98)
2791 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2792 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2793 /*is_primary=*/true,
2794 /*is_partial=*/false,
2795 /*is_friend_decl=*/2))
2796 return G_("redeclaration of friend %q#D "
2797 "may not have default template arguments");
2801 else if (VAR_P (newdecl)
2802 && CP_DECL_THREAD_LOCAL_P (newdecl) != CP_DECL_THREAD_LOCAL_P (olddecl)
2803 && (! DECL_LANG_SPECIFIC (olddecl)
2804 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2805 || CP_DECL_THREAD_LOCAL_P (newdecl)))
2807 /* Only variables can be thread-local, and all declarations must
2808 agree on this property. */
2809 if (CP_DECL_THREAD_LOCAL_P (newdecl))
2810 return G_("thread-local declaration of %q#D follows "
2811 "non-thread-local declaration");
2813 return G_("non-thread-local declaration of %q#D follows "
2814 "thread-local declaration");
2816 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2818 /* The objects have been declared at namespace scope. If either
2819 is a member of an anonymous union, then this is an invalid
2820 redeclaration. For example:
2826 if ((VAR_P (newdecl) && DECL_ANON_UNION_VAR_P (newdecl))
2827 || (VAR_P (olddecl) && DECL_ANON_UNION_VAR_P (olddecl)))
2828 return G_("redeclaration of %q#D");
2829 /* If at least one declaration is a reference, there is no
2830 conflict. For example:
2836 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2838 /* Reject two definitions. */
2839 return G_("redefinition of %q#D");
2843 /* Objects declared with block scope: */
2844 /* Reject two definitions, and reject a definition
2845 together with an external reference. */
2846 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2847 return G_("redeclaration of %q#D");
2852 /* Hash and equality functions for the named_label table. */
2855 named_label_hasher::hash (named_label_entry *ent)
2857 return DECL_UID (ent->label_decl);
2861 named_label_hasher::equal (named_label_entry *a, named_label_entry *b)
2863 return a->label_decl == b->label_decl;
2866 /* Create a new label, named ID. */
2869 make_label_decl (tree id, int local_p)
2871 struct named_label_entry *ent;
2874 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2876 DECL_CONTEXT (decl) = current_function_decl;
2877 DECL_MODE (decl) = VOIDmode;
2878 C_DECLARED_LABEL_FLAG (decl) = local_p;
2880 /* Say where one reference is to the label, for the sake of the
2881 error if it is not defined. */
2882 DECL_SOURCE_LOCATION (decl) = input_location;
2884 /* Record the fact that this identifier is bound to this label. */
2885 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2887 /* Create the label htab for the function on demand. */
2889 named_labels = hash_table<named_label_hasher>::create_ggc (13);
2891 /* Record this label on the list of labels used in this function.
2892 We do this before calling make_label_decl so that we get the
2893 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2894 ent = ggc_cleared_alloc<named_label_entry> ();
2895 ent->label_decl = decl;
2897 named_label_entry **slot = named_labels->find_slot (ent, INSERT);
2898 gcc_assert (*slot == NULL);
2904 /* Look for a label named ID in the current function. If one cannot
2905 be found, create one. (We keep track of used, but undefined,
2906 labels, and complain about them at the end of a function.) */
2909 lookup_label_1 (tree id)
2913 /* You can't use labels at global scope. */
2914 if (current_function_decl == NULL_TREE)
2916 error ("label %qE referenced outside of any function", id);
2920 /* See if we've already got this label. */
2921 decl = IDENTIFIER_LABEL_VALUE (id);
2922 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2925 decl = make_label_decl (id, /*local_p=*/0);
2929 /* Wrapper for lookup_label_1. */
2932 lookup_label (tree id)
2935 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2936 ret = lookup_label_1 (id);
2937 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2941 /* Declare a local label named ID. */
2944 declare_local_label (tree id)
2947 cp_label_binding bind;
2949 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2950 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2951 bind.prev_value = IDENTIFIER_LABEL_VALUE (id);
2953 decl = make_label_decl (id, /*local_p=*/1);
2955 vec_safe_push (current_binding_level->shadowed_labels, bind);
2960 /* Returns nonzero if it is ill-formed to jump past the declaration of
2961 DECL. Returns 2 if it's also a real problem. */
2964 decl_jump_unsafe (tree decl)
2966 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2967 with automatic storage duration is not in scope to a point where it is
2968 in scope is ill-formed unless the variable has scalar type, class type
2969 with a trivial default constructor and a trivial destructor, a
2970 cv-qualified version of one of these types, or an array of one of the
2971 preceding types and is declared without an initializer (8.5). */
2972 tree type = TREE_TYPE (decl);
2974 if (!VAR_P (decl) || TREE_STATIC (decl)
2975 || type == error_mark_node)
2978 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl)
2979 || variably_modified_type_p (type, NULL_TREE))
2982 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
2988 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
2992 identify_goto (tree decl, location_t loc, const location_t *locus,
2993 diagnostic_t diag_kind)
2996 = (decl ? emit_diagnostic (diag_kind, loc, 0, "jump to label %qD", decl)
2997 : emit_diagnostic (diag_kind, loc, 0, "jump to case label"));
2998 if (complained && locus)
2999 inform (*locus, " from here");
3003 /* Check that a single previously seen jump to a newly defined label
3004 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3005 the jump context; NAMES are the names in scope in LEVEL at the jump
3006 context; LOCUS is the source position of the jump or 0. Returns
3007 true if all is well. */
3010 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
3011 bool exited_omp, const location_t *locus)
3013 cp_binding_level *b;
3014 bool complained = false;
3016 bool saw_eh = false, saw_omp = false, saw_tm = false;
3020 complained = identify_goto (decl, input_location, locus, DK_ERROR);
3022 inform (input_location, " exits OpenMP structured block");
3027 for (b = current_binding_level; b ; b = b->level_chain)
3029 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
3031 for (new_decls = b->names; new_decls != old_decls;
3032 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
3033 : TREE_CHAIN (new_decls)))
3035 int problem = decl_jump_unsafe (new_decls);
3041 complained = identify_goto (decl, input_location, locus,
3048 inform (DECL_SOURCE_LOCATION (new_decls),
3049 " crosses initialization of %q#D", new_decls);
3051 inform (DECL_SOURCE_LOCATION (new_decls),
3052 " enters scope of %q#D which has "
3053 "non-trivial destructor", new_decls);
3059 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
3063 complained = identify_goto (decl, input_location, locus,
3069 if (b->kind == sk_try)
3070 inform (input_location, " enters try block");
3072 inform (input_location, " enters catch block");
3076 if (b->kind == sk_omp && !saw_omp)
3080 complained = identify_goto (decl, input_location, locus,
3085 inform (input_location, " enters OpenMP structured block");
3088 if (b->kind == sk_transaction && !saw_tm)
3092 complained = identify_goto (decl, input_location, locus,
3097 inform (input_location,
3098 " enters synchronized or atomic statement");
3107 check_previous_goto (tree decl, struct named_label_use_entry *use)
3109 check_previous_goto_1 (decl, use->binding_level,
3110 use->names_in_scope, use->in_omp_scope,
3111 &use->o_goto_locus);
3115 check_switch_goto (cp_binding_level* level)
3117 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
3120 /* Check that a new jump to a label DECL is OK. Called by
3121 finish_goto_stmt. */
3124 check_goto (tree decl)
3126 struct named_label_entry *ent, dummy;
3127 bool saw_catch = false, complained = false;
3132 /* We can't know where a computed goto is jumping.
3133 So we assume that it's OK. */
3134 if (TREE_CODE (decl) != LABEL_DECL)
3137 /* We didn't record any information about this label when we created it,
3138 and there's not much point since it's trivial to analyze as a return. */
3139 if (decl == cdtor_label)
3142 dummy.label_decl = decl;
3143 ent = named_labels->find (&dummy);
3144 gcc_assert (ent != NULL);
3146 /* If the label hasn't been defined yet, defer checking. */
3147 if (! DECL_INITIAL (decl))
3149 struct named_label_use_entry *new_use;
3151 /* Don't bother creating another use if the last goto had the
3152 same data, and will therefore create the same set of errors. */
3154 && ent->uses->names_in_scope == current_binding_level->names)
3157 new_use = ggc_alloc<named_label_use_entry> ();
3158 new_use->binding_level = current_binding_level;
3159 new_use->names_in_scope = current_binding_level->names;
3160 new_use->o_goto_locus = input_location;
3161 new_use->in_omp_scope = false;
3163 new_use->next = ent->uses;
3164 ent->uses = new_use;
3168 if (ent->in_try_scope || ent->in_catch_scope || ent->in_transaction_scope
3169 || ent->in_omp_scope || !vec_safe_is_empty (ent->bad_decls))
3171 diagnostic_t diag_kind = DK_PERMERROR;
3172 if (ent->in_try_scope || ent->in_catch_scope
3173 || ent->in_transaction_scope || ent->in_omp_scope)
3174 diag_kind = DK_ERROR;
3175 complained = identify_goto (decl, DECL_SOURCE_LOCATION (decl),
3176 &input_location, diag_kind);
3177 identified = 1 + (diag_kind == DK_ERROR);
3180 FOR_EACH_VEC_SAFE_ELT (ent->bad_decls, ix, bad)
3182 int u = decl_jump_unsafe (bad);
3184 if (u > 1 && DECL_ARTIFICIAL (bad))
3186 /* Can't skip init of __exception_info. */
3187 if (identified == 1)
3189 complained = identify_goto (decl, DECL_SOURCE_LOCATION (decl),
3190 &input_location, DK_ERROR);
3194 inform (DECL_SOURCE_LOCATION (bad), " enters catch block");
3197 else if (complained)
3200 inform (DECL_SOURCE_LOCATION (bad),
3201 " skips initialization of %q#D", bad);
3203 inform (DECL_SOURCE_LOCATION (bad),
3204 " enters scope of %q#D which has "
3205 "non-trivial destructor", bad);
3211 if (ent->in_try_scope)
3212 inform (input_location, " enters try block");
3213 else if (ent->in_catch_scope && !saw_catch)
3214 inform (input_location, " enters catch block");
3215 else if (ent->in_transaction_scope)
3216 inform (input_location, " enters synchronized or atomic statement");
3219 if (ent->in_omp_scope)
3222 inform (input_location, " enters OpenMP structured block");
3224 else if (flag_openmp)
3226 cp_binding_level *b;
3227 for (b = current_binding_level; b ; b = b->level_chain)
3229 if (b == ent->binding_level)
3231 if (b->kind == sk_omp)
3235 complained = identify_goto (decl,
3236 DECL_SOURCE_LOCATION (decl),
3237 &input_location, DK_ERROR);
3241 inform (input_location, " exits OpenMP structured block");
3248 /* Check that a return is ok wrt OpenMP structured blocks.
3249 Called by finish_return_stmt. Returns true if all is well. */
3252 check_omp_return (void)
3254 cp_binding_level *b;
3255 for (b = current_binding_level; b ; b = b->level_chain)
3256 if (b->kind == sk_omp)
3258 error ("invalid exit from OpenMP structured block");
3261 else if (b->kind == sk_function_parms)
3266 /* Define a label, specifying the location in the source file.
3267 Return the LABEL_DECL node for the label. */
3270 define_label_1 (location_t location, tree name)
3272 struct named_label_entry *ent, dummy;
3273 cp_binding_level *p;
3276 decl = lookup_label (name);
3278 dummy.label_decl = decl;
3279 ent = named_labels->find (&dummy);
3280 gcc_assert (ent != NULL);
3282 /* After labels, make any new cleanups in the function go into their
3283 own new (temporary) binding contour. */
3284 for (p = current_binding_level;
3285 p->kind != sk_function_parms;
3287 p->more_cleanups_ok = 0;
3289 if (name == get_identifier ("wchar_t"))
3290 permerror (input_location, "label named wchar_t");
3292 if (DECL_INITIAL (decl) != NULL_TREE)
3294 error ("duplicate label %qD", decl);
3295 return error_mark_node;
3299 struct named_label_use_entry *use;
3301 /* Mark label as having been defined. */
3302 DECL_INITIAL (decl) = error_mark_node;
3303 /* Say where in the source. */
3304 DECL_SOURCE_LOCATION (decl) = location;
3306 ent->binding_level = current_binding_level;
3307 ent->names_in_scope = current_binding_level->names;
3309 for (use = ent->uses; use ; use = use->next)
3310 check_previous_goto (decl, use);
3317 /* Wrapper for define_label_1. */
3320 define_label (location_t location, tree name)
3323 bool running = timevar_cond_start (TV_NAME_LOOKUP);
3324 ret = define_label_1 (location, name);
3325 timevar_cond_stop (TV_NAME_LOOKUP, running);
3332 cp_binding_level *level;
3333 struct cp_switch *next;
3334 /* The SWITCH_STMT being built. */
3336 /* A splay-tree mapping the low element of a case range to the high
3337 element, or NULL_TREE if there is no high element. Used to
3338 determine whether or not a new case label duplicates an old case
3339 label. We need a tree, rather than simply a hash table, because
3340 of the GNU case range extension. */
3342 /* Remember whether there was a case value that is outside the
3343 range of the original type of the controlling expression. */
3344 bool outside_range_p;
3347 /* A stack of the currently active switch statements. The innermost
3348 switch statement is on the top of the stack. There is no need to
3349 mark the stack for garbage collection because it is only active
3350 during the processing of the body of a function, and we never
3351 collect at that point. */
3353 static struct cp_switch *switch_stack;
3355 /* Called right after a switch-statement condition is parsed.
3356 SWITCH_STMT is the switch statement being parsed. */
3359 push_switch (tree switch_stmt)
3361 struct cp_switch *p = XNEW (struct cp_switch);
3362 p->level = current_binding_level;
3363 p->next = switch_stack;
3364 p->switch_stmt = switch_stmt;
3365 p->cases = splay_tree_new (case_compare, NULL, NULL);
3366 p->outside_range_p = false;
3373 struct cp_switch *cs = switch_stack;
3374 location_t switch_location;
3376 /* Emit warnings as needed. */
3377 switch_location = EXPR_LOC_OR_LOC (cs->switch_stmt, input_location);
3378 const bool bool_cond_p
3379 = (SWITCH_STMT_TYPE (cs->switch_stmt)
3380 && TREE_CODE (SWITCH_STMT_TYPE (cs->switch_stmt)) == BOOLEAN_TYPE);
3381 if (!processing_template_decl)
3382 c_do_switch_warnings (cs->cases, switch_location,
3383 SWITCH_STMT_TYPE (cs->switch_stmt),
3384 SWITCH_STMT_COND (cs->switch_stmt),
3385 bool_cond_p, cs->outside_range_p);
3387 splay_tree_delete (cs->cases);
3388 switch_stack = switch_stack->next;
3392 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3393 condition. Note that if TYPE and VALUE are already integral we don't
3394 really do the conversion because the language-independent
3395 warning/optimization code will work better that way. */
3398 case_conversion (tree type, tree value)
3400 if (value == NULL_TREE)
3403 if (cxx_dialect >= cxx11
3404 && (SCOPED_ENUM_P (type)
3405 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3407 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3408 type = type_promotes_to (type);
3409 value = (perform_implicit_conversion_flags
3410 (type, value, tf_warning_or_error,
3411 LOOKUP_IMPLICIT | LOOKUP_NO_NON_INTEGRAL));
3413 return cxx_constant_value (value);
3416 /* Note that we've seen a definition of a case label, and complain if this
3417 is a bad place for one. */
3420 finish_case_label (location_t loc, tree low_value, tree high_value)
3423 cp_binding_level *p;
3426 if (processing_template_decl)
3430 /* For templates, just add the case label; we'll do semantic
3431 analysis at instantiation-time. */
3432 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3433 return add_stmt (build_case_label (low_value, high_value, label));
3436 /* Find the condition on which this switch statement depends. */
3437 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3438 if (cond && TREE_CODE (cond) == TREE_LIST)
3439 cond = TREE_VALUE (cond);
3441 if (!check_switch_goto (switch_stack->level))
3442 return error_mark_node;
3444 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3446 low_value = case_conversion (type, low_value);
3447 high_value = case_conversion (type, high_value);
3449 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3450 low_value, high_value,
3451 &switch_stack->outside_range_p);
3453 /* After labels, make any new cleanups in the function go into their
3454 own new (temporary) binding contour. */
3455 for (p = current_binding_level;
3456 p->kind != sk_function_parms;
3458 p->more_cleanups_ok = 0;
3463 struct typename_info {
3471 struct typename_hasher : ggc_ptr_hash<tree_node>
3473 typedef typename_info *compare_type;
3475 /* Hash a TYPENAME_TYPE. */
3482 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3483 ^ htab_hash_pointer (TYPE_IDENTIFIER (t)));
3488 /* Compare two TYPENAME_TYPEs. */
3491 equal (tree t1, const typename_info *t2)
3493 return (TYPE_IDENTIFIER (t1) == t2->name
3494 && TYPE_CONTEXT (t1) == t2->scope
3495 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3496 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3497 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3501 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3502 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3504 Returns the new TYPENAME_TYPE. */
3506 static GTY (()) hash_table<typename_hasher> *typename_htab;
3509 build_typename_type (tree context, tree name, tree fullname,
3510 enum tag_types tag_type)
3518 if (typename_htab == NULL)
3519 typename_htab = hash_table<typename_hasher>::create_ggc (61);
3521 ti.scope = FROB_CONTEXT (context);
3523 ti.template_id = fullname;
3524 ti.enum_p = tag_type == enum_type;
3525 ti.class_p = (tag_type == class_type
3526 || tag_type == record_type
3527 || tag_type == union_type);
3528 hash = (htab_hash_pointer (ti.scope)
3529 ^ htab_hash_pointer (ti.name));
3531 /* See if we already have this type. */
3532 e = typename_htab->find_slot_with_hash (&ti, hash, INSERT);
3537 /* Build the TYPENAME_TYPE. */
3538 t = cxx_make_type (TYPENAME_TYPE);
3539 TYPE_CONTEXT (t) = ti.scope;
3540 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3541 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3542 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3544 /* Build the corresponding TYPE_DECL. */
3545 d = build_decl (input_location, TYPE_DECL, name, t);
3546 TYPE_NAME (TREE_TYPE (d)) = d;
3547 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3548 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3549 DECL_ARTIFICIAL (d) = 1;
3551 /* Store it in the hash table. */
3554 /* TYPENAME_TYPEs must always be compared structurally, because
3555 they may or may not resolve down to another type depending on
3556 the currently open classes. */
3557 SET_TYPE_STRUCTURAL_EQUALITY (t);
3563 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3564 provided to name the type. Returns an appropriate type, unless an
3565 error occurs, in which case error_mark_node is returned. If we
3566 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3567 return that, rather than the _TYPE it corresponds to, in other
3568 cases we look through the type decl. If TF_ERROR is set, complain
3569 about errors, otherwise be quiet. */
3572 make_typename_type (tree context, tree name, enum tag_types tag_type,
3573 tsubst_flags_t complain)
3579 if (name == error_mark_node
3580 || context == NULL_TREE
3581 || context == error_mark_node)
3582 return error_mark_node;
3586 if (!(TYPE_LANG_SPECIFIC (name)
3587 && (CLASSTYPE_IS_TEMPLATE (name)
3588 || CLASSTYPE_USE_TEMPLATE (name))))
3589 name = TYPE_IDENTIFIER (name);
3591 /* Create a TEMPLATE_ID_EXPR for the type. */
3592 name = build_nt (TEMPLATE_ID_EXPR,
3593 CLASSTYPE_TI_TEMPLATE (name),
3594 CLASSTYPE_TI_ARGS (name));
3596 else if (TREE_CODE (name) == TYPE_DECL)
3597 name = DECL_NAME (name);
3601 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3603 name = TREE_OPERAND (name, 0);
3604 if (DECL_TYPE_TEMPLATE_P (name))
3605 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3606 if (TREE_CODE (name) != IDENTIFIER_NODE)
3608 if (complain & tf_error)
3609 error ("%qD is not a type", name);
3610 return error_mark_node;
3613 if (TREE_CODE (name) == TEMPLATE_DECL)
3615 if (complain & tf_error)
3616 error ("%qD used without template parameters", name);
3617 return error_mark_node;
3619 gcc_assert (identifier_p (name));
3620 gcc_assert (TYPE_P (context));
3622 if (!MAYBE_CLASS_TYPE_P (context))
3624 if (complain & tf_error)
3625 error ("%q#T is not a class", context);
3626 return error_mark_node;
3629 /* When the CONTEXT is a dependent type, NAME could refer to a
3630 dependent base class of CONTEXT. But look inside it anyway
3631 if CONTEXT is a currently open scope, in case it refers to a
3632 member of the current instantiation or a non-dependent base;
3633 lookup will stop when we hit a dependent base. */
3634 if (!dependent_scope_p (context))
3635 /* We should only set WANT_TYPE when we're a nested typename type.
3636 Then we can give better diagnostics if we find a non-type. */
3637 t = lookup_field (context, name, 2, /*want_type=*/true);
3641 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3642 return build_typename_type (context, name, fullname, tag_type);
3644 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3648 if (complain & tf_error)
3649 error (want_template ? G_("no class template named %q#T in %q#T")
3650 : G_("no type named %q#T in %q#T"), name, context);
3651 return error_mark_node;
3654 /* Pull out the template from an injected-class-name (or multiple). */
3656 t = maybe_get_template_decl_from_type_decl (t);
3658 if (TREE_CODE (t) == TREE_LIST)
3660 if (complain & tf_error)
3662 error ("lookup of %qT in %qT is ambiguous", name, context);
3663 print_candidates (t);
3665 return error_mark_node;
3668 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3670 if (complain & tf_error)
3671 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3673 return error_mark_node;
3675 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3677 if (complain & tf_error)
3678 error ("%<typename %T::%D%> names %q#T, which is not a type",
3680 return error_mark_node;
3683 if (!perform_or_defer_access_check (TYPE_BINFO (context), t, t, complain))
3684 return error_mark_node;
3686 /* If we are currently parsing a template and if T is a typedef accessed
3687 through CONTEXT then we need to remember and check access of T at
3688 template instantiation time. */
3689 add_typedef_to_current_template_for_access_check (t, context, input_location);
3692 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3694 /*entering_scope=*/0,
3695 complain | tf_user);
3697 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3700 maybe_record_typedef_use (t);
3705 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3706 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3707 in which case error_mark_node is returned.
3709 If PARM_LIST is non-NULL, also make sure that the template parameter
3710 list of TEMPLATE_DECL matches.
3712 If COMPLAIN zero, don't complain about any errors that occur. */
3715 make_unbound_class_template (tree context, tree name, tree parm_list,
3716 tsubst_flags_t complain)
3722 name = TYPE_IDENTIFIER (name);
3723 else if (DECL_P (name))
3724 name = DECL_NAME (name);
3725 gcc_assert (identifier_p (name));
3727 if (!dependent_type_p (context)
3728 || currently_open_class (context))
3730 tree tmpl = NULL_TREE;
3732 if (MAYBE_CLASS_TYPE_P (context))
3733 tmpl = lookup_field (context, name, 0, false);
3735 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3736 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3738 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3740 if (complain & tf_error)
3741 error ("no class template named %q#T in %q#T", name, context);
3742 return error_mark_node;
3746 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3748 if (complain & tf_error)
3750 error ("template parameters do not match template %qD", tmpl);
3751 inform (DECL_SOURCE_LOCATION (tmpl),
3752 "%qD declared here", tmpl);
3754 return error_mark_node;
3757 if (!perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl,
3759 return error_mark_node;
3764 /* Build the UNBOUND_CLASS_TEMPLATE. */
3765 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3766 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3767 TREE_TYPE (t) = NULL_TREE;
3768 SET_TYPE_STRUCTURAL_EQUALITY (t);
3770 /* Build the corresponding TEMPLATE_DECL. */
3771 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3772 TYPE_NAME (TREE_TYPE (d)) = d;
3773 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3774 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3775 DECL_ARTIFICIAL (d) = 1;
3776 DECL_TEMPLATE_PARMS (d) = parm_list;
3783 /* Push the declarations of builtin types into the namespace.
3784 RID_INDEX is the index of the builtin type in the array
3785 RID_POINTERS. NAME is the name used when looking up the builtin
3786 type. TYPE is the _TYPE node for the builtin type. */
3789 record_builtin_type (enum rid rid_index,
3793 tree rname = NULL_TREE, tname = NULL_TREE;
3794 tree tdecl = NULL_TREE;
3796 if ((int) rid_index < (int) RID_MAX)
3797 rname = ridpointers[(int) rid_index];
3799 tname = get_identifier (name);
3801 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3802 eliminated. Built-in types should not be looked up name; their
3803 names are keywords that the parser can recognize. However, there
3804 is code in c-common.c that uses identifier_global_value to look
3805 up built-in types by name. */
3808 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3809 DECL_ARTIFICIAL (tdecl) = 1;
3810 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3816 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3817 DECL_ARTIFICIAL (tdecl) = 1;
3819 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3822 if (!TYPE_NAME (type))
3823 TYPE_NAME (type) = tdecl;
3826 debug_hooks->type_decl (tdecl, 0);
3829 /* Record one of the standard Java types.
3830 * Declare it as having the given NAME.
3831 * If SIZE > 0, it is the size of one of the integral types;
3832 * otherwise it is the negative of the size of one of the other types. */
3835 record_builtin_java_type (const char* name, int size)
3840 type = build_nonstandard_integer_type (size, 0);
3841 type = build_distinct_type_copy (type);
3843 else if (size > -32)
3846 /* "__java_char" or ""__java_boolean". */
3847 type = build_nonstandard_integer_type (-size, 1);
3848 type = build_distinct_type_copy (type);
3849 /* Get the signed type cached and attached to the unsigned type,
3850 so it doesn't get garbage-collected at "random" times,
3851 causing potential codegen differences out of different UIDs
3852 and different alias set numbers. */
3853 stype = build_nonstandard_integer_type (-size, 0);
3854 stype = build_distinct_type_copy (stype);
3855 TREE_CHAIN (type) = stype;
3856 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3859 { /* "__java_float" or ""__java_double". */
3860 type = make_node (REAL_TYPE);
3861 TYPE_PRECISION (type) = - size;
3864 record_builtin_type (RID_MAX, name, type);
3865 decl = TYPE_NAME (type);
3867 /* Suppress generate debug symbol entries for these types,
3868 since for normal C++ they are just clutter.
3869 However, push_lang_context undoes this if extern "Java" is seen. */
3870 DECL_IGNORED_P (decl) = 1;
3872 TYPE_FOR_JAVA (type) = 1;
3876 /* Push a type into the namespace so that the back ends ignore it. */
3879 record_unknown_type (tree type, const char* name)
3881 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3882 TYPE_DECL, get_identifier (name), type));
3883 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3884 DECL_IGNORED_P (decl) = 1;
3885 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3886 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3887 TYPE_ALIGN (type) = 1;
3888 TYPE_USER_ALIGN (type) = 0;
3889 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3892 /* A string for which we should create an IDENTIFIER_NODE at
3895 struct predefined_identifier
3897 /* The name of the identifier. */
3898 const char *const name;
3899 /* The place where the IDENTIFIER_NODE should be stored. */
3901 /* Nonzero if this is the name of a constructor or destructor. */
3902 const int ctor_or_dtor_p;
3905 /* Create all the predefined identifiers. */
3908 initialize_predefined_identifiers (void)
3910 const predefined_identifier *pid;
3912 /* A table of identifiers to create at startup. */
3913 static const predefined_identifier predefined_identifiers[] = {
3914 { "C++", &lang_name_cplusplus, 0 },
3915 { "C", &lang_name_c, 0 },
3916 { "Java", &lang_name_java, 0 },
3917 /* Some of these names have a trailing space so that it is
3918 impossible for them to conflict with names written by users. */
3919 { "__ct ", &ctor_identifier, 1 },
3920 { "__base_ctor ", &base_ctor_identifier, 1 },
3921 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3922 { "__dt ", &dtor_identifier, 1 },
3923 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3924 { "__base_dtor ", &base_dtor_identifier, 1 },
3925 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3926 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3927 { "nelts", &nelts_identifier, 0 },
3928 { THIS_NAME, &this_identifier, 0 },
3929 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3930 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3931 { "_vptr", &vptr_identifier, 0 },
3932 { "__vtt_parm", &vtt_parm_identifier, 0 },
3933 { "::", &global_scope_name, 0 },
3934 { "std", &std_identifier, 0 },
3938 for (pid = predefined_identifiers; pid->name; ++pid)
3940 *pid->node = get_identifier (pid->name);
3941 if (pid->ctor_or_dtor_p)
3942 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3946 /* Create the predefined scalar types of C,
3947 and some nodes representing standard constants (0, 1, (void *)0).
3948 Initialize the global binding level.
3949 Make definitions for built-in primitive functions. */
3952 cxx_init_decl_processing (void)
3955 tree void_ftype_ptr;
3957 /* Create all the identifiers we need. */
3958 initialize_predefined_identifiers ();
3960 /* Create the global variables. */
3961 push_to_top_level ();
3963 current_function_decl = NULL_TREE;
3964 current_binding_level = NULL;
3965 /* Enter the global namespace. */
3966 gcc_assert (global_namespace == NULL_TREE);
3967 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3969 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3970 debug_hooks->register_main_translation_unit
3971 (DECL_CONTEXT (global_namespace));
3972 TREE_PUBLIC (global_namespace) = 1;
3973 begin_scope (sk_namespace, global_namespace);
3975 if (flag_visibility_ms_compat)
3976 default_visibility = VISIBILITY_HIDDEN;
3979 current_lang_name = lang_name_c;
3981 /* Create the `std' namespace. */
3982 push_namespace (std_identifier);
3983 std_node = current_namespace;
3986 c_common_nodes_and_builtins ();
3988 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3989 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3990 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3991 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3992 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3993 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3994 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3995 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3997 integer_two_node = build_int_cst (NULL_TREE, 2);
3999 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
4000 truthvalue_type_node = boolean_type_node;
4001 truthvalue_false_node = boolean_false_node;
4002 truthvalue_true_node = boolean_true_node;
4004 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
4005 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
4006 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
4009 record_builtin_type (RID_MAX, NULL, string_type_node);
4012 delta_type_node = ptrdiff_type_node;
4013 vtable_index_type = ptrdiff_type_node;
4015 vtt_parm_type = build_pointer_type (const_ptr_type_node);
4016 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
4017 void_ftype_ptr = build_function_type_list (void_type_node,
4018 ptr_type_node, NULL_TREE);
4020 = build_exception_variant (void_ftype_ptr, empty_except_spec);
4022 /* C++ extensions */
4024 unknown_type_node = make_node (LANG_TYPE);
4025 record_unknown_type (unknown_type_node, "unknown type");
4027 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4028 TREE_TYPE (unknown_type_node) = unknown_type_node;
4030 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4032 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
4033 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
4035 init_list_type_node = make_node (LANG_TYPE);
4036 record_unknown_type (init_list_type_node, "init list");
4039 /* Make sure we get a unique function type, so we can give
4040 its pointer type a name. (This wins for gdb.) */
4041 tree vfunc_type = make_node (FUNCTION_TYPE);
4042 TREE_TYPE (vfunc_type) = integer_type_node;
4043 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
4044 layout_type (vfunc_type);
4046 vtable_entry_type = build_pointer_type (vfunc_type);
4048 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
4051 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
4052 layout_type (vtbl_type_node);
4053 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
4054 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
4055 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
4056 layout_type (vtbl_ptr_type_node);
4057 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
4059 push_namespace (get_identifier ("__cxxabiv1"));
4060 abi_node = current_namespace;
4063 global_type_node = make_node (LANG_TYPE);
4064 record_unknown_type (global_type_node, "global type");
4067 current_lang_name = lang_name_cplusplus;
4070 tree newattrs, extvisattr;
4071 tree newtype, deltype;
4072 tree ptr_ftype_sizetype;
4076 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
4077 if (cxx_dialect == cxx98)
4080 tree bad_alloc_type_node;
4081 tree bad_alloc_decl;
4083 push_namespace (std_identifier);
4084 bad_alloc_id = get_identifier ("bad_alloc");
4085 bad_alloc_type_node = make_class_type (RECORD_TYPE);
4086 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
4088 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
4089 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
4093 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
4096 new_eh_spec = noexcept_false_spec;
4098 /* Ensure attribs.c is initialized. */
4101 /* Ensure constraint.cc is initialized. */
4102 init_constraint_processing ();
4104 extvisattr = build_tree_list (get_identifier ("externally_visible"),
4106 newattrs = tree_cons (get_identifier ("alloc_size"),
4107 build_tree_list (NULL_TREE, integer_one_node),
4109 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
4110 newtype = build_exception_variant (newtype, new_eh_spec);
4111 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
4112 deltype = build_exception_variant (deltype, empty_except_spec);
4113 tree opnew = push_cp_library_fn (NEW_EXPR, newtype, 0);
4114 DECL_IS_MALLOC (opnew) = 1;
4115 DECL_IS_OPERATOR_NEW (opnew) = 1;
4116 opnew = push_cp_library_fn (VEC_NEW_EXPR, newtype, 0);
4117 DECL_IS_MALLOC (opnew) = 1;
4118 DECL_IS_OPERATOR_NEW (opnew) = 1;
4119 push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
4120 push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
4121 if (flag_sized_deallocation)
4123 /* Also push the sized deallocation variants:
4124 void operator delete(void*, std::size_t) throw();
4125 void operator delete[](void*, std::size_t) throw(); */
4126 tree void_ftype_ptr_size
4127 = build_function_type_list (void_type_node, ptr_type_node,
4128 size_type_node, NULL_TREE);
4129 deltype = cp_build_type_attribute_variant (void_ftype_ptr_size,
4131 deltype = build_exception_variant (deltype, empty_except_spec);
4132 push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
4133 push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
4136 nullptr_type_node = make_node (NULLPTR_TYPE);
4137 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
4138 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
4139 TYPE_UNSIGNED (nullptr_type_node) = 1;
4140 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
4141 if (abi_version_at_least (9))
4142 TYPE_ALIGN (nullptr_type_node) = GET_MODE_ALIGNMENT (ptr_mode);
4143 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
4144 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
4145 nullptr_node = build_int_cst (nullptr_type_node, 0);
4149 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype,
4150 ECF_NORETURN | ECF_NOTHROW);
4152 /* Perform other language dependent initializations. */
4153 init_class_processing ();
4154 init_rtti_processing ();
4155 init_template_processing ();
4157 if (flag_exceptions)
4158 init_exception_processing ();
4160 if (! supports_one_only ())
4163 make_fname_decl = cp_make_fname_decl;
4164 start_fname_decls ();
4166 /* Show we use EH for cleanups. */
4167 if (flag_exceptions)
4168 using_eh_for_cleanups ();
4171 /* Generate an initializer for a function naming variable from
4172 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4173 filled in with the type of the init. */
4176 cp_fname_init (const char* name, tree *type_p)
4178 tree domain = NULL_TREE;
4180 tree init = NULL_TREE;
4185 length = strlen (name);
4186 domain = build_index_type (size_int (length));
4187 init = build_string (length + 1, name);
4190 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
4191 type = build_cplus_array_type (type, domain);
4196 TREE_TYPE (init) = type;
4198 init = error_mark_node;
4203 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4204 the decl, LOC is the location to give the decl, NAME is the
4205 initialization string and TYPE_DEP indicates whether NAME depended
4206 on the type of the function. We make use of that to detect
4207 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4208 at the point of first use, so we mustn't push the decl now. */
4211 cp_make_fname_decl (location_t loc, tree id, int type_dep)
4213 const char *const name = (type_dep && processing_template_decl
4214 ? NULL : fname_as_string (type_dep));
4216 tree init = cp_fname_init (name, &type);
4217 tree decl = build_decl (loc, VAR_DECL, id, type);
4220 free (CONST_CAST (char *, name));
4222 /* As we're using pushdecl_with_scope, we must set the context. */
4223 DECL_CONTEXT (decl) = current_function_decl;
4225 TREE_STATIC (decl) = 1;
4226 TREE_READONLY (decl) = 1;
4227 DECL_ARTIFICIAL (decl) = 1;
4229 TREE_USED (decl) = 1;
4231 if (current_function_decl)
4233 cp_binding_level *b = current_binding_level;
4234 if (b->kind == sk_function_parms)
4235 return error_mark_node;
4236 while (b->level_chain->kind != sk_function_parms)
4238 pushdecl_with_scope (decl, b, /*is_friend=*/false);
4239 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
4240 LOOKUP_ONLYCONVERTING);
4244 DECL_THIS_STATIC (decl) = true;
4245 pushdecl_top_level_and_finish (decl, init);
4252 builtin_function_1 (tree decl, tree context, bool is_global)
4254 tree id = DECL_NAME (decl);
4255 const char *name = IDENTIFIER_POINTER (id);
4257 retrofit_lang_decl (decl);
4259 DECL_ARTIFICIAL (decl) = 1;
4260 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
4261 SET_DECL_LANGUAGE (decl, lang_c);
4262 /* Runtime library routines are, by definition, available in an
4263 external shared object. */
4264 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
4265 DECL_VISIBILITY_SPECIFIED (decl) = 1;
4267 DECL_CONTEXT (decl) = context;
4270 pushdecl_top_level (decl);
4274 /* A function in the user's namespace should have an explicit
4275 declaration before it is used. Mark the built-in function as
4276 anticipated but not actually declared. */
4277 if (name[0] != '_' || name[1] != '_')
4278 DECL_ANTICIPATED (decl) = 1;
4279 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
4281 size_t len = strlen (name);
4283 /* Treat __*_chk fortification functions as anticipated as well,
4284 unless they are __builtin_*. */
4285 if (len > strlen ("___chk")
4286 && memcmp (name + len - strlen ("_chk"),
4287 "_chk", strlen ("_chk") + 1) == 0)
4288 DECL_ANTICIPATED (decl) = 1;
4295 cxx_builtin_function (tree decl)
4297 tree id = DECL_NAME (decl);
4298 const char *name = IDENTIFIER_POINTER (id);
4299 /* All builtins that don't begin with an '_' should additionally
4300 go in the 'std' namespace. */
4303 tree decl2 = copy_node(decl);
4304 push_namespace (std_identifier);
4305 builtin_function_1 (decl2, std_node, false);
4309 return builtin_function_1 (decl, NULL_TREE, false);
4312 /* Like cxx_builtin_function, but guarantee the function is added to the global
4313 scope. This is to allow function specific options to add new machine
4314 dependent builtins when the target ISA changes via attribute((target(...)))
4315 which saves space on program startup if the program does not use non-generic
4319 cxx_builtin_function_ext_scope (tree decl)
4322 tree id = DECL_NAME (decl);
4323 const char *name = IDENTIFIER_POINTER (id);
4324 /* All builtins that don't begin with an '_' should additionally
4325 go in the 'std' namespace. */
4328 tree decl2 = copy_node(decl);
4329 push_namespace (std_identifier);
4330 builtin_function_1 (decl2, std_node, true);
4334 return builtin_function_1 (decl, NULL_TREE, true);
4337 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4338 function. Not called directly. */
4341 build_library_fn (tree name, enum tree_code operator_code, tree type,
4344 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
4345 DECL_EXTERNAL (fn) = 1;
4346 TREE_PUBLIC (fn) = 1;
4347 DECL_ARTIFICIAL (fn) = 1;
4348 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
4349 SET_DECL_LANGUAGE (fn, lang_c);
4350 /* Runtime library routines are, by definition, available in an
4351 external shared object. */
4352 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
4353 DECL_VISIBILITY_SPECIFIED (fn) = 1;
4354 set_call_expr_flags (fn, ecf_flags);
4358 /* Returns the _DECL for a library function with C++ linkage. */
4361 build_cp_library_fn (tree name, enum tree_code operator_code, tree type,
4364 tree fn = build_library_fn (name, operator_code, type, ecf_flags);
4365 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
4366 SET_DECL_LANGUAGE (fn, lang_cplusplus);
4370 /* Like build_library_fn, but takes a C string instead of an
4374 build_library_fn_ptr (const char* name, tree type, int ecf_flags)
4376 return build_library_fn (get_identifier (name), ERROR_MARK, type, ecf_flags);
4379 /* Like build_cp_library_fn, but takes a C string instead of an
4383 build_cp_library_fn_ptr (const char* name, tree type, int ecf_flags)
4385 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type,
4389 /* Like build_library_fn, but also pushes the function so that we will
4390 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
4391 may throw exceptions listed in RAISES. */
4394 push_library_fn (tree name, tree type, tree raises, int ecf_flags)
4399 type = build_exception_variant (type, raises);
4401 fn = build_library_fn (name, ERROR_MARK, type, ecf_flags);
4402 pushdecl_top_level (fn);
4406 /* Like build_cp_library_fn, but also pushes the function so that it
4407 will be found by normal lookup. */
4410 push_cp_library_fn (enum tree_code operator_code, tree type,
4413 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4418 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4422 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4426 push_void_library_fn (tree name, tree parmtypes, int ecf_flags)
4428 tree type = build_function_type (void_type_node, parmtypes);
4429 return push_library_fn (name, type, NULL_TREE, ecf_flags);
4432 /* Like push_library_fn, but also note that this function throws
4433 and does not return. Used for __throw_foo and the like. */
4436 push_throw_library_fn (tree name, tree type)
4438 tree fn = push_library_fn (name, type, NULL_TREE, ECF_NORETURN);
4442 /* When we call finish_struct for an anonymous union, we create
4443 default copy constructors and such. But, an anonymous union
4444 shouldn't have such things; this function undoes the damage to the
4445 anonymous union type T.
4447 (The reason that we create the synthesized methods is that we don't
4448 distinguish `union { int i; }' from `typedef union { int i; } U'.
4449 The first is an anonymous union; the second is just an ordinary
4453 fixup_anonymous_aggr (tree t)
4457 /* Wipe out memory of synthesized methods. */
4458 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4459 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4460 TYPE_HAS_COPY_CTOR (t) = 0;
4461 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4462 TYPE_HAS_COPY_ASSIGN (t) = 0;
4463 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4465 /* Splice the implicitly generated functions out of the TYPE_METHODS
4467 q = &TYPE_METHODS (t);
4470 if (DECL_ARTIFICIAL (*q))
4471 *q = TREE_CHAIN (*q);
4473 q = &DECL_CHAIN (*q);
4476 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4477 if (TYPE_METHODS (t))
4479 tree decl = TYPE_MAIN_DECL (t);
4481 if (TREE_CODE (t) != UNION_TYPE)
4482 error_at (DECL_SOURCE_LOCATION (decl),
4483 "an anonymous struct cannot have function members");
4485 error_at (DECL_SOURCE_LOCATION (decl),
4486 "an anonymous union cannot have function members");
4489 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4490 assignment operators (because they cannot have these methods themselves).
4491 For anonymous unions this is already checked because they are not allowed
4492 in any union, otherwise we have to check it. */
4493 if (TREE_CODE (t) != UNION_TYPE)
4497 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4498 if (TREE_CODE (field) == FIELD_DECL)
4500 type = TREE_TYPE (field);
4501 if (CLASS_TYPE_P (type))
4503 if (TYPE_NEEDS_CONSTRUCTING (type))
4504 error ("member %q+#D with constructor not allowed "
4505 "in anonymous aggregate", field);
4506 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4507 error ("member %q+#D with destructor not allowed "
4508 "in anonymous aggregate", field);
4509 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4510 error ("member %q+#D with copy assignment operator "
4511 "not allowed in anonymous aggregate", field);
4517 /* Warn for an attribute located at LOCATION that appertains to the
4518 class type CLASS_TYPE that has not been properly placed after its
4519 class-key, in it class-specifier. */
4522 warn_misplaced_attr_for_class_type (source_location location,
4525 gcc_assert (OVERLOAD_TYPE_P (class_type));
4527 if (warning_at (location, OPT_Wattributes,
4528 "attribute ignored in declaration "
4529 "of %q#T", class_type))
4531 "attribute for %q#T must follow the %qs keyword",
4532 class_type, class_key_or_enum_as_string (class_type));
4535 /* Make sure that a declaration with no declarator is well-formed, i.e.
4536 just declares a tagged type or anonymous union.
4538 Returns the type declared; or NULL_TREE if none. */
4541 check_tag_decl (cp_decl_specifier_seq *declspecs,
4542 bool explicit_type_instantiation_p)
4544 int saw_friend = decl_spec_seq_has_spec_p (declspecs, ds_friend);
4545 int saw_typedef = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
4546 /* If a class, struct, or enum type is declared by the DECLSPECS
4547 (i.e, if a class-specifier, enum-specifier, or non-typename
4548 elaborated-type-specifier appears in the DECLSPECS),
4549 DECLARED_TYPE is set to the corresponding type. */
4550 tree declared_type = NULL_TREE;
4551 bool error_p = false;
4553 if (declspecs->multiple_types_p)
4554 error ("multiple types in one declaration");
4555 else if (declspecs->redefined_builtin_type)
4557 if (!in_system_header_at (input_location))
4558 permerror (declspecs->locations[ds_redefined_builtin_type_spec],
4559 "redeclaration of C++ built-in type %qT",
4560 declspecs->redefined_builtin_type);
4565 && TYPE_P (declspecs->type)
4566 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4567 && MAYBE_CLASS_TYPE_P (declspecs->type))
4568 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4569 declared_type = declspecs->type;
4570 else if (declspecs->type == error_mark_node)
4572 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4573 permerror (input_location, "declaration does not declare anything");
4574 else if (declared_type != NULL_TREE && type_uses_auto (declared_type))
4576 error_at (declspecs->locations[ds_type_spec],
4577 "%<auto%> can only be specified for variables "
4578 "or function declarations");
4579 return error_mark_node;
4581 /* Check for an anonymous union. */
4582 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4583 && TYPE_ANONYMOUS_P (declared_type))
4585 /* 7/3 In a simple-declaration, the optional init-declarator-list
4586 can be omitted only when declaring a class (clause 9) or
4587 enumeration (7.2), that is, when the decl-specifier-seq contains
4588 either a class-specifier, an elaborated-type-specifier with
4589 a class-key (9.1), or an enum-specifier. In these cases and
4590 whenever a class-specifier or enum-specifier is present in the
4591 decl-specifier-seq, the identifiers in these specifiers are among
4592 the names being declared by the declaration (as class-name,
4593 enum-names, or enumerators, depending on the syntax). In such
4594 cases, and except for the declaration of an unnamed bit-field (9.6),
4595 the decl-specifier-seq shall introduce one or more names into the
4596 program, or shall redeclare a name introduced by a previous
4597 declaration. [Example:
4598 enum { }; // ill-formed
4599 typedef class { }; // ill-formed
4603 error ("missing type-name in typedef-declaration");
4606 /* Anonymous unions are objects, so they can have specifiers. */;
4607 SET_ANON_AGGR_TYPE_P (declared_type);
4609 if (TREE_CODE (declared_type) != UNION_TYPE
4610 && !in_system_header_at (input_location))
4611 pedwarn (input_location, OPT_Wpedantic, "ISO C++ prohibits anonymous structs");
4616 if (decl_spec_seq_has_spec_p (declspecs, ds_inline))
4617 error_at (declspecs->locations[ds_inline],
4618 "%<inline%> can only be specified for functions");
4619 else if (decl_spec_seq_has_spec_p (declspecs, ds_virtual))
4620 error_at (declspecs->locations[ds_virtual],
4621 "%<virtual%> can only be specified for functions");
4623 && (!current_class_type
4624 || current_scope () != current_class_type))
4625 error_at (declspecs->locations[ds_friend],
4626 "%<friend%> can only be specified inside a class");
4627 else if (decl_spec_seq_has_spec_p (declspecs, ds_explicit))
4628 error_at (declspecs->locations[ds_explicit],
4629 "%<explicit%> can only be specified for constructors");
4630 else if (declspecs->storage_class)
4631 error_at (declspecs->locations[ds_storage_class],
4632 "a storage class can only be specified for objects "
4634 else if (decl_spec_seq_has_spec_p (declspecs, ds_const))
4635 error_at (declspecs->locations[ds_const],
4636 "%<const%> can only be specified for objects and "
4638 else if (decl_spec_seq_has_spec_p (declspecs, ds_volatile))
4639 error_at (declspecs->locations[ds_volatile],
4640 "%<volatile%> can only be specified for objects and "
4642 else if (decl_spec_seq_has_spec_p (declspecs, ds_restrict))
4643 error_at (declspecs->locations[ds_restrict],
4644 "%<__restrict%> can only be specified for objects and "
4646 else if (decl_spec_seq_has_spec_p (declspecs, ds_thread))
4647 error_at (declspecs->locations[ds_thread],
4648 "%<__thread%> can only be specified for objects "
4650 else if (saw_typedef)
4651 warning_at (declspecs->locations[ds_typedef], 0,
4652 "%<typedef%> was ignored in this declaration");
4653 else if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr))
4654 error_at (declspecs->locations[ds_constexpr],
4655 "%<constexpr%> cannot be used for type declarations");
4658 if (declspecs->attributes && warn_attributes && declared_type)
4661 if (!CLASS_TYPE_P (declared_type)
4662 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type))
4663 /* For a non-template class, use the name location. */
4664 loc = location_of (declared_type);
4666 /* For a template class (an explicit instantiation), use the
4667 current location. */
4668 loc = input_location;
4670 if (explicit_type_instantiation_p)
4671 /* [dcl.attr.grammar]/4:
4673 No attribute-specifier-seq shall appertain to an explicit
4676 if (warning_at (loc, OPT_Wattributes,
4677 "attribute ignored in explicit instantiation %q#T",
4680 "no attribute can be applied to "
4681 "an explicit instantiation");
4684 warn_misplaced_attr_for_class_type (loc, declared_type);
4687 return declared_type;
4690 /* Called when a declaration is seen that contains no names to declare.
4691 If its type is a reference to a structure, union or enum inherited
4692 from a containing scope, shadow that tag name for the current scope
4693 with a forward reference.
4694 If its type defines a new named structure or union
4695 or defines an enum, it is valid but we need not do anything here.
4696 Otherwise, it is an error.
4698 C++: may have to grok the declspecs to learn about static,
4699 complain for anonymous unions.
4701 Returns the TYPE declared -- or NULL_TREE if none. */
4704 shadow_tag (cp_decl_specifier_seq *declspecs)
4706 tree t = check_tag_decl (declspecs,
4707 /*explicit_type_instantiation_p=*/false);
4712 if (maybe_process_partial_specialization (t) == error_mark_node)
4715 /* This is where the variables in an anonymous union are
4716 declared. An anonymous union declaration looks like:
4718 because there is no declarator after the union, the parser
4719 sends that declaration here. */
4720 if (ANON_AGGR_TYPE_P (t))
4722 fixup_anonymous_aggr (t);
4724 if (TYPE_FIELDS (t))
4726 tree decl = grokdeclarator (/*declarator=*/NULL,
4727 declspecs, NORMAL, 0, NULL);
4728 finish_anon_union (decl);
4735 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4738 groktypename (cp_decl_specifier_seq *type_specifiers,
4739 const cp_declarator *declarator,
4740 bool is_template_arg)
4744 enum decl_context context
4745 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4746 attrs = type_specifiers->attributes;
4747 type_specifiers->attributes = NULL_TREE;
4748 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4749 if (attrs && type != error_mark_node)
4751 if (CLASS_TYPE_P (type))
4752 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4753 "outside of definition", type);
4754 else if (MAYBE_CLASS_TYPE_P (type))
4755 /* A template type parameter or other dependent type. */
4756 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4757 "type %qT without an associated declaration", type);
4759 cplus_decl_attributes (&type, attrs, 0);
4764 /* Process a DECLARATOR for a function-scope variable declaration,
4765 namespace-scope variable declaration, or function declaration.
4766 (Function definitions go through start_function; class member
4767 declarations appearing in the body of the class go through
4768 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4769 If an error occurs, the error_mark_node is returned instead.
4771 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4772 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4773 for an explicitly defaulted function, or SD_DELETED for an explicitly
4774 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4775 implicitly initialized via a default constructor. ATTRIBUTES and
4776 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4778 The scope represented by the context of the returned DECL is pushed
4779 (if it is not the global namespace) and is assigned to
4780 *PUSHED_SCOPE_P. The caller is then responsible for calling
4781 pop_scope on *PUSHED_SCOPE_P if it is set. */
4784 start_decl (const cp_declarator *declarator,
4785 cp_decl_specifier_seq *declspecs,
4788 tree prefix_attributes,
4789 tree *pushed_scope_p)
4797 *pushed_scope_p = NULL_TREE;
4799 /* An object declared as __attribute__((deprecated)) suppresses
4800 warnings of uses of other deprecated items. */
4801 if (lookup_attribute ("deprecated", attributes))
4802 deprecated_state = DEPRECATED_SUPPRESS;
4804 attributes = chainon (attributes, prefix_attributes);
4806 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4809 deprecated_state = DEPRECATED_NORMAL;
4811 if (decl == NULL_TREE || VOID_TYPE_P (decl)
4812 || decl == error_mark_node)
4813 return error_mark_node;
4815 context = CP_DECL_CONTEXT (decl);
4816 if (context != global_namespace)
4817 *pushed_scope_p = push_scope (context);
4819 /* Is it valid for this decl to have an initializer at all?
4820 If not, set INITIALIZED to zero, which will indirectly
4821 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4823 && TREE_CODE (decl) == TYPE_DECL)
4825 error ("typedef %qD is initialized (use decltype instead)", decl);
4826 return error_mark_node;
4831 if (! toplevel_bindings_p ()
4832 && DECL_EXTERNAL (decl))
4833 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4835 DECL_EXTERNAL (decl) = 0;
4836 if (toplevel_bindings_p ())
4837 TREE_STATIC (decl) = 1;
4839 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4841 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4842 record_key_method_defined (decl);
4844 /* If this is a typedef that names the class for linkage purposes
4845 (7.1.3p8), apply any attributes directly to the type. */
4846 if (TREE_CODE (decl) == TYPE_DECL
4847 && OVERLOAD_TYPE_P (TREE_TYPE (decl))
4848 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4849 flags = ATTR_FLAG_TYPE_IN_PLACE;
4853 /* Set attributes here so if duplicate decl, will have proper attributes. */
4854 cplus_decl_attributes (&decl, attributes, flags);
4856 /* Dllimported symbols cannot be defined. Static data members (which
4857 can be initialized in-class and dllimported) go through grokfield,
4858 not here, so we don't need to exclude those decls when checking for
4860 if (initialized && DECL_DLLIMPORT_P (decl))
4862 error ("definition of %q#D is marked %<dllimport%>", decl);
4863 DECL_DLLIMPORT_P (decl) = 0;
4866 /* If #pragma weak was used, mark the decl weak now. */
4867 if (!processing_template_decl)
4868 maybe_apply_pragma_weak (decl);
4870 if (TREE_CODE (decl) == FUNCTION_DECL
4871 && DECL_DECLARED_INLINE_P (decl)
4872 && DECL_UNINLINABLE (decl)
4873 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4874 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4875 "inline function %qD given attribute noinline", decl);
4877 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4879 bool this_tmpl = (processing_template_decl
4880 > template_class_depth (context));
4883 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4884 if (field == NULL_TREE
4885 || !(VAR_P (field) || variable_template_p (field)))
4886 error ("%q+#D is not a static data member of %q#T", decl, context);
4887 else if (variable_template_p (field) && !this_tmpl)
4889 if (DECL_LANG_SPECIFIC (decl)
4890 && DECL_TEMPLATE_SPECIALIZATION (decl))
4891 /* OK, specialization was already checked. */;
4894 error_at (DECL_SOURCE_LOCATION (decl),
4895 "non-member-template declaration of %qD", decl);
4896 inform (DECL_SOURCE_LOCATION (field), "does not match "
4897 "member template declaration here");
4898 return error_mark_node;
4903 if (variable_template_p (field))
4904 field = DECL_TEMPLATE_RESULT (field);
4906 if (DECL_CONTEXT (field) != context)
4908 if (!same_type_p (DECL_CONTEXT (field), context))
4909 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4910 "to be defined as %<%T::%D%>",
4911 DECL_CONTEXT (field), DECL_NAME (decl),
4912 context, DECL_NAME (decl));
4913 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4915 /* Static data member are tricky; an in-class initialization
4916 still doesn't provide a definition, so the in-class
4917 declaration will have DECL_EXTERNAL set, but will have an
4918 initialization. Thus, duplicate_decls won't warn
4919 about this situation, and so we check here. */
4920 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4921 error ("duplicate initialization of %qD", decl);
4922 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4924 if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr)
4925 && !DECL_DECLARED_CONSTEXPR_P (field))
4926 error ("%qD declared %<constexpr%> outside its class", field);
4931 tree field = check_classfn (context, decl,
4933 ? current_template_parms
4935 if (field && field != error_mark_node
4936 && duplicate_decls (decl, field,
4937 /*newdecl_is_friend=*/false))
4941 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4942 DECL_IN_AGGR_P (decl) = 0;
4943 /* Do not mark DECL as an explicit specialization if it was not
4944 already marked as an instantiation; a declaration should
4945 never be marked as a specialization unless we know what
4946 template is being specialized. */
4947 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4949 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4950 if (TREE_CODE (decl) == FUNCTION_DECL)
4951 DECL_COMDAT (decl) = (TREE_PUBLIC (decl)
4952 && DECL_DECLARED_INLINE_P (decl));
4954 DECL_COMDAT (decl) = false;
4956 /* [temp.expl.spec] An explicit specialization of a static data
4957 member of a template is a definition if the declaration
4958 includes an initializer; otherwise, it is a declaration.
4960 We check for processing_specialization so this only applies
4961 to the new specialization syntax. */
4962 if (!initialized && processing_specialization)
4963 DECL_EXTERNAL (decl) = 1;
4966 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4967 /* Aliases are definitions. */
4969 permerror (input_location, "declaration of %q#D outside of class is not definition",
4973 was_public = TREE_PUBLIC (decl);
4975 /* Enter this declaration into the symbol table. Don't push the plain
4976 VAR_DECL for a variable template. */
4977 if (!template_parm_scope_p ()
4979 decl = maybe_push_decl (decl);
4981 if (processing_template_decl)
4982 decl = push_template_decl (decl);
4983 if (decl == error_mark_node)
4984 return error_mark_node;
4987 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4988 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4990 /* This is a const variable with implicit 'static'. Set
4991 DECL_THIS_STATIC so we can tell it from variables that are
4992 !TREE_PUBLIC because of the anonymous namespace. */
4993 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4994 DECL_THIS_STATIC (decl) = 1;
4997 if (current_function_decl && VAR_P (decl)
4998 && DECL_DECLARED_CONSTEXPR_P (current_function_decl))
5001 if (CP_DECL_THREAD_LOCAL_P (decl))
5002 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5004 else if (TREE_STATIC (decl))
5005 error ("%qD declared %<static%> in %<constexpr%> function", decl);
5009 cp_function_chain->invalid_constexpr = true;
5012 if (!processing_template_decl && VAR_P (decl))
5013 start_decl_1 (decl, initialized);
5018 /* Process the declaration of a variable DECL. INITIALIZED is true
5019 iff DECL is explicitly initialized. (INITIALIZED is false if the
5020 variable is initialized via an implicitly-called constructor.)
5021 This function must be called for ordinary variables (including, for
5022 example, implicit instantiations of templates), but must not be
5023 called for template declarations. */
5026 start_decl_1 (tree decl, bool initialized)
5030 bool aggregate_definition_p;
5032 gcc_assert (!processing_template_decl);
5034 if (error_operand_p (decl))
5037 gcc_assert (VAR_P (decl));
5039 type = TREE_TYPE (decl);
5040 complete_p = COMPLETE_TYPE_P (type);
5041 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
5043 /* If an explicit initializer is present, or if this is a definition
5044 of an aggregate, then we need a complete type at this point.
5045 (Scalars are always complete types, so there is nothing to
5046 check.) This code just sets COMPLETE_P; errors (if necessary)
5047 are issued below. */
5048 if ((initialized || aggregate_definition_p)
5050 && COMPLETE_TYPE_P (complete_type (type)))
5053 /* We will not yet have set TREE_READONLY on DECL if the type
5054 was "const", but incomplete, before this point. But, now, we
5055 have a complete type, so we can try again. */
5056 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
5060 /* Is it valid for this decl to have an initializer at all? */
5062 /* Don't allow initializations for incomplete types except for
5063 arrays which might be completed by the initialization. */
5065 ; /* A complete type is ok. */
5066 else if (type_uses_auto (type))
5067 ; /* An auto type is ok. */
5068 else if (TREE_CODE (type) != ARRAY_TYPE)
5070 error ("variable %q#D has initializer but incomplete type", decl);
5071 type = TREE_TYPE (decl) = error_mark_node;
5073 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
5075 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
5076 error ("elements of array %q#D have incomplete type", decl);
5077 /* else we already gave an error in start_decl. */
5080 else if (aggregate_definition_p && !complete_p)
5082 if (type_uses_auto (type))
5083 error ("declaration of %q#D has no initializer", decl);
5085 error ("aggregate %q#D has incomplete type and cannot be defined",
5087 /* Change the type so that assemble_variable will give
5088 DECL an rtl we can live with: (mem (const_int 0)). */
5089 type = TREE_TYPE (decl) = error_mark_node;
5092 /* Create a new scope to hold this declaration if necessary.
5093 Whether or not a new scope is necessary cannot be determined
5094 until after the type has been completed; if the type is a
5095 specialization of a class template it is not until after
5096 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5097 will be set correctly. */
5098 maybe_push_cleanup_level (type);
5101 /* Handle initialization of references. DECL, TYPE, and INIT have the
5102 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5103 but will be set to a new CLEANUP_STMT if a temporary is created
5104 that must be destroyed subsequently.
5106 Returns an initializer expression to use to initialize DECL, or
5107 NULL if the initialization can be performed statically.
5109 Quotes on semantics can be found in ARM 8.4.3. */
5112 grok_reference_init (tree decl, tree type, tree init, int flags)
5114 if (init == NULL_TREE)
5116 if ((DECL_LANG_SPECIFIC (decl) == 0
5117 || DECL_IN_AGGR_P (decl) == 0)
5118 && ! DECL_THIS_EXTERN (decl))
5119 error ("%qD declared as reference but not initialized", decl);
5123 if (TREE_CODE (init) == TREE_LIST)
5124 init = build_x_compound_expr_from_list (init, ELK_INIT,
5125 tf_warning_or_error);
5127 tree ttype = TREE_TYPE (type);
5128 if (TREE_CODE (ttype) != ARRAY_TYPE
5129 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
5130 /* Note: default conversion is only called in very special cases. */
5131 init = decay_conversion (init, tf_warning_or_error);
5133 /* check_initializer handles this for non-reference variables, but for
5134 references we need to do it here or the initializer will get the
5135 incomplete array type and confuse later calls to
5136 cp_complete_array_type. */
5137 if (TREE_CODE (ttype) == ARRAY_TYPE
5138 && TYPE_DOMAIN (ttype) == NULL_TREE
5139 && (BRACE_ENCLOSED_INITIALIZER_P (init)
5140 || TREE_CODE (init) == STRING_CST))
5142 cp_complete_array_type (&ttype, init, false);
5143 if (ttype != TREE_TYPE (type))
5144 type = cp_build_reference_type (ttype, TYPE_REF_IS_RVALUE (type));
5147 /* Convert INIT to the reference type TYPE. This may involve the
5148 creation of a temporary, whose lifetime must be the same as that
5149 of the reference. If so, a DECL_EXPR for the temporary will be
5150 added just after the DECL_EXPR for DECL. That's why we don't set
5151 DECL_INITIAL for local references (instead assigning to them
5152 explicitly); we need to allow the temporary to be initialized
5154 return initialize_reference (type, init, flags,
5155 tf_warning_or_error);
5158 /* Designated initializers in arrays are not supported in GNU C++.
5159 The parser cannot detect this error since it does not know whether
5160 a given brace-enclosed initializer is for a class type or for an
5161 array. This function checks that CE does not use a designated
5162 initializer. If it does, an error is issued. Returns true if CE
5163 is valid, i.e., does not have a designated initializer. */
5166 check_array_designated_initializer (constructor_elt *ce,
5167 unsigned HOST_WIDE_INT index)
5169 /* Designated initializers for array elements are not supported. */
5172 /* The parser only allows identifiers as designated
5174 if (ce->index == error_mark_node)
5176 error ("name used in a GNU-style designated "
5177 "initializer for an array");
5180 else if (identifier_p (ce->index))
5182 error ("name %qD used in a GNU-style designated "
5183 "initializer for an array", ce->index);
5187 tree ce_index = build_expr_type_conversion (WANT_INT | WANT_ENUM,
5190 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index))
5191 && (TREE_CODE (ce_index = maybe_constant_value (ce_index))
5194 /* A C99 designator is OK if it matches the current index. */
5195 if (wi::eq_p (ce_index, index))
5198 sorry ("non-trivial designated initializers not supported");
5201 error ("C99 designator %qE is not an integral constant-expression",
5210 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5211 array until we finish parsing the initializer. If that's the
5212 situation we're in, update DECL accordingly. */
5215 maybe_deduce_size_from_array_init (tree decl, tree init)
5217 tree type = TREE_TYPE (decl);
5219 if (TREE_CODE (type) == ARRAY_TYPE
5220 && TYPE_DOMAIN (type) == NULL_TREE
5221 && TREE_CODE (decl) != TYPE_DECL)
5223 /* do_default is really a C-ism to deal with tentative definitions.
5224 But let's leave it here to ease the eventual merge. */
5225 int do_default = !DECL_EXTERNAL (decl);
5226 tree initializer = init ? init : DECL_INITIAL (decl);
5229 /* Check that there are no designated initializers in INIT, as
5230 those are not supported in GNU C++, and as the middle-end
5231 will crash if presented with a non-numeric designated
5233 if (initializer && BRACE_ENCLOSED_INITIALIZER_P (initializer))
5235 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initializer);
5236 constructor_elt *ce;
5238 FOR_EACH_VEC_SAFE_ELT (v, i, ce)
5239 if (!check_array_designated_initializer (ce, i))
5245 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
5249 error ("initializer fails to determine size of %qD", decl);
5251 else if (failure == 2)
5255 error ("array size missing in %qD", decl);
5257 /* If a `static' var's size isn't known, make it extern as
5258 well as static, so it does not get allocated. If it's not
5259 `static', then don't mark it extern; finish_incomplete_decl
5260 will give it a default size and it will get allocated. */
5261 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
5262 DECL_EXTERNAL (decl) = 1;
5264 else if (failure == 3)
5266 error ("zero-size array %qD", decl);
5270 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
5272 relayout_decl (decl);
5276 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5277 any appropriate error messages regarding the layout. */
5280 layout_var_decl (tree decl)
5284 type = TREE_TYPE (decl);
5285 if (type == error_mark_node)
5288 /* If we haven't already laid out this declaration, do so now.
5289 Note that we must not call complete type for an external object
5290 because it's type might involve templates that we are not
5291 supposed to instantiate yet. (And it's perfectly valid to say
5292 `extern X x' for some incomplete type `X'.) */
5293 if (!DECL_EXTERNAL (decl))
5294 complete_type (type);
5295 if (!DECL_SIZE (decl)
5296 && TREE_TYPE (decl) != error_mark_node
5297 && (COMPLETE_TYPE_P (type)
5298 || (TREE_CODE (type) == ARRAY_TYPE
5299 && !TYPE_DOMAIN (type)
5300 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
5301 layout_decl (decl, 0);
5303 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
5305 /* An automatic variable with an incomplete type: that is an error.
5306 Don't talk about array types here, since we took care of that
5307 message in grokdeclarator. */
5308 error ("storage size of %qD isn%'t known", decl);
5309 TREE_TYPE (decl) = error_mark_node;
5312 /* Keep this code around in case we later want to control debug info
5313 based on whether a type is "used". (jason 1999-11-11) */
5315 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
5316 /* Let debugger know it should output info for this type. */
5317 note_debug_info_needed (ttype);
5319 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
5320 note_debug_info_needed (DECL_CONTEXT (decl));
5323 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
5324 && DECL_SIZE (decl) != NULL_TREE
5325 && ! TREE_CONSTANT (DECL_SIZE (decl)))
5327 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
5328 constant_expression_warning (DECL_SIZE (decl));
5331 error ("storage size of %qD isn%'t constant", decl);
5332 TREE_TYPE (decl) = error_mark_node;
5337 /* If a local static variable is declared in an inline function, or if
5338 we have a weak definition, we must endeavor to create only one
5339 instance of the variable at link-time. */
5342 maybe_commonize_var (tree decl)
5344 /* Static data in a function with comdat linkage also has comdat
5346 if (TREE_STATIC (decl)
5347 /* Don't mess with __FUNCTION__. */
5348 && ! DECL_ARTIFICIAL (decl)
5349 && DECL_FUNCTION_SCOPE_P (decl)
5350 && vague_linkage_p (DECL_CONTEXT (decl)))
5354 /* With weak symbols, we simply make the variable COMDAT;
5355 that will cause copies in multiple translations units to
5357 comdat_linkage (decl);
5361 if (DECL_INITIAL (decl) == NULL_TREE
5362 || DECL_INITIAL (decl) == error_mark_node)
5364 /* Without weak symbols, we can use COMMON to merge
5365 uninitialized variables. */
5366 TREE_PUBLIC (decl) = 1;
5367 DECL_COMMON (decl) = 1;
5371 /* While for initialized variables, we must use internal
5372 linkage -- which means that multiple copies will not
5374 TREE_PUBLIC (decl) = 0;
5375 DECL_COMMON (decl) = 0;
5376 if (warning_at (DECL_SOURCE_LOCATION (decl), 0,
5377 "sorry: semantics of inline function static "
5378 "data %q#D are wrong (you%'ll wind up "
5379 "with multiple copies)", decl))
5380 inform (DECL_SOURCE_LOCATION (decl),
5381 "you can work around this by removing the initializer");
5387 /* Issue an error message if DECL is an uninitialized const variable. */
5390 check_for_uninitialized_const_var (tree decl)
5392 tree type = strip_array_types (TREE_TYPE (decl));
5394 /* ``Unless explicitly declared extern, a const object does not have
5395 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5398 && TREE_CODE (type) != REFERENCE_TYPE
5399 && (CP_TYPE_CONST_P (type) || var_in_constexpr_fn (decl))
5400 && !DECL_INITIAL (decl))
5402 tree field = default_init_uninitialized_part (type);
5406 if (CP_TYPE_CONST_P (type))
5407 permerror (DECL_SOURCE_LOCATION (decl),
5408 "uninitialized const %qD", decl);
5411 error_at (DECL_SOURCE_LOCATION (decl),
5412 "uninitialized variable %qD in %<constexpr%> function",
5414 cp_function_chain->invalid_constexpr = true;
5417 if (CLASS_TYPE_P (type))
5419 tree defaulted_ctor;
5421 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
5422 "%q#T has no user-provided default constructor", type);
5423 defaulted_ctor = in_class_defaulted_default_constructor (type);
5425 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
5426 "constructor is not user-provided because it is "
5427 "explicitly defaulted in the class body");
5428 inform (DECL_SOURCE_LOCATION (field),
5429 "and the implicitly-defined constructor does not "
5430 "initialize %q#D", field);
5435 /* Structure holding the current initializer being processed by reshape_init.
5436 CUR is a pointer to the current element being processed, END is a pointer
5437 after the last element present in the initializer. */
5440 constructor_elt *cur;
5441 constructor_elt *end;
5444 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
5446 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5447 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5448 initialized. If there are no more such fields, the return value
5452 next_initializable_field (tree field)
5455 && (TREE_CODE (field) != FIELD_DECL
5456 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
5457 || DECL_ARTIFICIAL (field)))
5458 field = DECL_CHAIN (field);
5463 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5464 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5465 INTEGER_CST representing the size of the array minus one (the maximum index),
5466 or NULL_TREE if the array was declared without specifying the size. D is
5467 the iterator within the constructor. */
5470 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
5471 tsubst_flags_t complain)
5474 bool sized_array_p = (max_index && TREE_CONSTANT (max_index));
5475 unsigned HOST_WIDE_INT max_index_cst = 0;
5476 unsigned HOST_WIDE_INT index;
5478 /* The initializer for an array is always a CONSTRUCTOR. */
5479 new_init = build_constructor (init_list_type_node, NULL);
5483 /* Minus 1 is used for zero sized arrays. */
5484 if (integer_all_onesp (max_index))
5487 if (tree_fits_uhwi_p (max_index))
5488 max_index_cst = tree_to_uhwi (max_index);
5489 /* sizetype is sign extended, not zero extended. */
5491 max_index_cst = tree_to_uhwi (fold_convert (size_type_node, max_index));
5494 /* Loop until there are no more initializers. */
5496 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5500 constructor_elt *old_cur = d->cur;
5502 check_array_designated_initializer (d->cur, index);
5503 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5505 if (elt_init == error_mark_node)
5506 return error_mark_node;
5507 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5508 size_int (index), elt_init);
5509 if (!TREE_CONSTANT (elt_init))
5510 TREE_CONSTANT (new_init) = false;
5512 /* This can happen with an invalid initializer (c++/54501). */
5513 if (d->cur == old_cur && !sized_array_p)
5520 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5521 Parameters are the same of reshape_init_r. */
5524 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5526 tree max_index = NULL_TREE;
5528 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5530 if (TYPE_DOMAIN (type))
5531 max_index = array_type_nelts (type);
5533 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5536 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5537 Parameters are the same of reshape_init_r. */
5540 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5542 tree max_index = NULL_TREE;
5544 gcc_assert (VECTOR_TYPE_P (type));
5546 if (COMPOUND_LITERAL_P (d->cur->value))
5548 tree value = d->cur->value;
5549 if (!same_type_p (TREE_TYPE (value), type))
5551 if (complain & tf_error)
5552 error ("invalid type %qT as initializer for a vector of type %qT",
5553 TREE_TYPE (d->cur->value), type);
5554 value = error_mark_node;
5560 /* For a vector, we initialize it as an array of the appropriate size. */
5561 if (VECTOR_TYPE_P (type))
5562 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5564 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5567 /* Subroutine of reshape_init_r, processes the initializers for classes
5568 or union. Parameters are the same of reshape_init_r. */
5571 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5572 tsubst_flags_t complain)
5577 gcc_assert (CLASS_TYPE_P (type));
5579 /* The initializer for a class is always a CONSTRUCTOR. */
5580 new_init = build_constructor (init_list_type_node, NULL);
5581 field = next_initializable_field (TYPE_FIELDS (type));
5587 An initializer for an aggregate member that is an
5588 empty class shall have the form of an empty
5589 initializer-list {}. */
5590 if (!first_initializer_p)
5592 if (complain & tf_error)
5593 error ("initializer for %qT must be brace-enclosed", type);
5594 return error_mark_node;
5599 /* Loop through the initializable fields, gathering initializers. */
5600 while (d->cur != d->end)
5603 constructor_elt *old_cur = d->cur;
5605 /* Handle designated initializers, as an extension. */
5608 if (d->cur->index == error_mark_node)
5609 return error_mark_node;
5611 if (TREE_CODE (d->cur->index) == FIELD_DECL)
5612 /* We already reshaped this. */
5613 gcc_assert (d->cur->index == field);
5614 else if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
5615 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5618 if (complain & tf_error)
5619 error ("%<[%E] =%> used in a GNU-style designated initializer"
5620 " for class %qT", d->cur->index, type);
5621 return error_mark_node;
5624 if (!field || TREE_CODE (field) != FIELD_DECL)
5626 if (complain & tf_error)
5627 error ("%qT has no non-static data member named %qD", type,
5629 return error_mark_node;
5633 /* If we processed all the member of the class, we are done. */
5637 field_init = reshape_init_r (TREE_TYPE (field), d,
5638 /*first_initializer_p=*/false, complain);
5639 if (field_init == error_mark_node)
5640 return error_mark_node;
5642 if (d->cur == old_cur && d->cur->index)
5644 /* This can happen with an invalid initializer for a flexible
5645 array member (c++/54441). */
5646 if (complain & tf_error)
5647 error ("invalid initializer for %q#D", field);
5648 return error_mark_node;
5651 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5655 When a union is initialized with a brace-enclosed
5656 initializer, the braces shall only contain an
5657 initializer for the first member of the union. */
5658 if (TREE_CODE (type) == UNION_TYPE)
5661 field = next_initializable_field (DECL_CHAIN (field));
5667 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5668 designators are not valid; either complain or return true to indicate
5669 that reshape_init_r should return error_mark_node. */
5672 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
5676 if (complain & tf_error)
5677 error ("C99 designator %qE outside aggregate initializer",
5685 /* Subroutine of reshape_init, which processes a single initializer (part of
5686 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5687 iterator within the CONSTRUCTOR which points to the initializer to process.
5688 FIRST_INITIALIZER_P is true if this is the first initializer of the
5689 outermost CONSTRUCTOR node. */
5692 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5693 tsubst_flags_t complain)
5695 tree init = d->cur->value;
5697 if (error_operand_p (init))
5698 return error_mark_node;
5700 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
5701 && has_designator_problem (d, complain))
5702 return error_mark_node;
5704 if (TREE_CODE (type) == COMPLEX_TYPE)
5706 /* A complex type can be initialized from one or two initializers,
5707 but braces are not elided. */
5709 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5711 if (CONSTRUCTOR_NELTS (init) > 2)
5713 if (complain & tf_error)
5714 error ("too many initializers for %qT", type);
5716 return error_mark_node;
5719 else if (first_initializer_p && d->cur != d->end)
5721 vec<constructor_elt, va_gc> *v = 0;
5722 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5723 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5724 if (has_designator_problem (d, complain))
5725 return error_mark_node;
5727 init = build_constructor (init_list_type_node, v);
5732 /* A non-aggregate type is always initialized with a single
5734 if (!CP_AGGREGATE_TYPE_P (type))
5736 /* It is invalid to initialize a non-aggregate type with a
5737 brace-enclosed initializer before C++0x.
5738 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5739 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5740 a CONSTRUCTOR (with a record type). */
5741 if (TREE_CODE (init) == CONSTRUCTOR
5742 /* Don't complain about a capture-init. */
5743 && !CONSTRUCTOR_IS_DIRECT_INIT (init)
5744 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5746 if (SCALAR_TYPE_P (type))
5748 if (cxx_dialect < cxx11
5749 /* Isn't value-initialization. */
5750 || CONSTRUCTOR_NELTS (init) > 0)
5752 if (complain & tf_error)
5753 error ("braces around scalar initializer for type %qT",
5755 init = error_mark_node;
5759 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5766 /* "If T is a class type and the initializer list has a single element of
5767 type cv U, where U is T or a class derived from T, the object is
5768 initialized from that element." Even if T is an aggregate. */
5769 if (cxx_dialect >= cxx11 && (CLASS_TYPE_P (type) || VECTOR_TYPE_P (type))
5770 && first_initializer_p
5771 && d->end - d->cur == 1
5772 && reference_related_p (type, TREE_TYPE (init)))
5780 All implicit type conversions (clause _conv_) are considered when
5781 initializing the aggregate member with an initializer from an
5782 initializer-list. If the initializer can initialize a member,
5783 the member is initialized. Otherwise, if the member is itself a
5784 non-empty subaggregate, brace elision is assumed and the
5785 initializer is considered for the initialization of the first
5786 member of the subaggregate. */
5787 if (TREE_CODE (init) != CONSTRUCTOR
5788 /* But don't try this for the first initializer, since that would be
5789 looking through the outermost braces; A a2 = { a1 }; is not a
5790 valid aggregate initialization. */
5791 && !first_initializer_p
5792 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5793 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL,
5800 /* [dcl.init.string]
5802 A char array (whether plain char, signed char, or unsigned char)
5803 can be initialized by a string-literal (optionally enclosed in
5804 braces); a wchar_t array can be initialized by a wide
5805 string-literal (optionally enclosed in braces). */
5806 if (TREE_CODE (type) == ARRAY_TYPE
5807 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5809 tree str_init = init;
5811 /* Strip one level of braces if and only if they enclose a single
5812 element (as allowed by [dcl.init.string]). */
5813 if (!first_initializer_p
5814 && TREE_CODE (str_init) == CONSTRUCTOR
5815 && vec_safe_length (CONSTRUCTOR_ELTS (str_init)) == 1)
5817 str_init = (*CONSTRUCTOR_ELTS (str_init))[0].value;
5820 /* If it's a string literal, then it's the initializer for the array
5821 as a whole. Otherwise, continue with normal initialization for
5822 array types (one value per array element). */
5823 if (TREE_CODE (str_init) == STRING_CST)
5825 if (has_designator_problem (d, complain))
5826 return error_mark_node;
5832 /* The following cases are about aggregates. If we are not within a full
5833 initializer already, and there is not a CONSTRUCTOR, it means that there
5834 is a missing set of braces (that is, we are processing the case for
5835 which reshape_init exists). */
5836 if (!first_initializer_p)
5838 if (TREE_CODE (init) == CONSTRUCTOR)
5840 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5841 /* There is no need to reshape pointer-to-member function
5842 initializers, as they are always constructed correctly
5843 by the front end. */
5845 else if (COMPOUND_LITERAL_P (init))
5846 /* For a nested compound literal, there is no need to reshape since
5847 brace elision is not allowed. Even if we decided to allow it,
5848 we should add a call to reshape_init in finish_compound_literal,
5849 before calling digest_init, so changing this code would still
5850 not be necessary. */
5851 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5855 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5856 return reshape_init (type, init, complain);
5860 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5864 /* Dispatch to specialized routines. */
5865 if (CLASS_TYPE_P (type))
5866 return reshape_init_class (type, d, first_initializer_p, complain);
5867 else if (TREE_CODE (type) == ARRAY_TYPE)
5868 return reshape_init_array (type, d, complain);
5869 else if (VECTOR_TYPE_P (type))
5870 return reshape_init_vector (type, d, complain);
5875 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5876 brace-enclosed aggregate initializer.
5878 INIT is the CONSTRUCTOR containing the list of initializers describing
5879 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5880 It may not presently match the shape of the TYPE; for example:
5882 struct S { int a; int b; };
5883 struct S a[] = { 1, 2, 3, 4 };
5885 Here INIT will hold a vector of four elements, rather than a
5886 vector of two elements, each itself a vector of two elements. This
5887 routine transforms INIT from the former form into the latter. The
5888 revised CONSTRUCTOR node is returned. */
5891 reshape_init (tree type, tree init, tsubst_flags_t complain)
5893 vec<constructor_elt, va_gc> *v;
5897 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5899 v = CONSTRUCTOR_ELTS (init);
5901 /* An empty constructor does not need reshaping, and it is always a valid
5903 if (vec_safe_is_empty (v))
5906 /* Recurse on this CONSTRUCTOR. */
5908 d.end = d.cur + v->length ();
5910 new_init = reshape_init_r (type, &d, true, complain);
5911 if (new_init == error_mark_node)
5912 return error_mark_node;
5914 /* Make sure all the element of the constructor were used. Otherwise,
5915 issue an error about exceeding initializers. */
5918 if (complain & tf_error)
5919 error ("too many initializers for %qT", type);
5921 return error_mark_node;
5927 /* Verify array initializer. Returns true if errors have been reported. */
5930 check_array_initializer (tree decl, tree type, tree init)
5932 tree element_type = TREE_TYPE (type);
5934 /* The array type itself need not be complete, because the
5935 initializer may tell us how many elements are in the array.
5936 But, the elements of the array must be complete. */
5937 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5940 error ("elements of array %q#D have incomplete type", decl);
5942 error ("elements of array %q#T have incomplete type", type);
5945 /* A compound literal can't have variable size. */
5947 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5948 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5950 error ("variable-sized compound literal");
5956 /* Subroutine of check_initializer; args are passed down from that function.
5957 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5960 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5963 gcc_assert (stmts_are_full_exprs_p ());
5964 return build_aggr_init (decl, init, flags, tf_warning_or_error);
5967 /* Verify INIT (the initializer for DECL), and record the
5968 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5969 grok_reference_init.
5971 If the return value is non-NULL, it is an expression that must be
5972 evaluated dynamically to initialize DECL. */
5975 check_initializer (tree decl, tree init, int flags, vec<tree, va_gc> **cleanups)
5977 tree type = TREE_TYPE (decl);
5978 tree init_code = NULL;
5981 /* Things that are going to be initialized need to have complete
5983 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5985 if (DECL_HAS_VALUE_EXPR_P (decl))
5987 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5988 it doesn't have storage to be initialized. */
5989 gcc_assert (init == NULL_TREE);
5993 if (type == error_mark_node)
5994 /* We will have already complained. */
5997 if (TREE_CODE (type) == ARRAY_TYPE)
5999 if (check_array_initializer (decl, type, init))
6002 else if (!COMPLETE_TYPE_P (type))
6004 error ("%q#D has incomplete type", decl);
6005 TREE_TYPE (decl) = error_mark_node;
6009 /* There is no way to make a variable-sized class type in GNU C++. */
6010 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
6012 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
6014 int init_len = vec_safe_length (CONSTRUCTOR_ELTS (init));
6015 if (SCALAR_TYPE_P (type))
6019 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
6020 init = build_zero_init (type, NULL_TREE, false);
6022 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
6024 error ("scalar object %qD requires one element in initializer",
6026 TREE_TYPE (decl) = error_mark_node;
6032 if (TREE_CODE (decl) == CONST_DECL)
6034 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
6036 DECL_INITIAL (decl) = init;
6038 gcc_assert (init != NULL_TREE);
6041 else if (!init && DECL_REALLY_EXTERN (decl))
6043 else if (init || type_build_ctor_call (type)
6044 || TREE_CODE (type) == REFERENCE_TYPE)
6046 if (TREE_CODE (type) == REFERENCE_TYPE)
6048 init = grok_reference_init (decl, type, init, flags);
6049 flags |= LOOKUP_ALREADY_DIGESTED;
6052 check_for_uninitialized_const_var (decl);
6053 /* Do not reshape constructors of vectors (they don't need to be
6055 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
6057 if (is_std_init_list (type))
6059 init = perform_implicit_conversion (type, init,
6060 tf_warning_or_error);
6061 flags |= LOOKUP_ALREADY_DIGESTED;
6063 else if (TYPE_NON_AGGREGATE_CLASS (type))
6065 /* Don't reshape if the class has constructors. */
6066 if (cxx_dialect == cxx98)
6067 error ("in C++98 %qD must be initialized by constructor, "
6071 else if (VECTOR_TYPE_P (type) && TYPE_VECTOR_OPAQUE (type))
6073 error ("opaque vector types cannot be initialized");
6074 init = error_mark_node;
6078 init = reshape_init (type, init, tf_warning_or_error);
6079 flags |= LOOKUP_NO_NARROWING;
6082 else if (TREE_CODE (init) == TREE_LIST
6083 && TREE_TYPE (init) != unknown_type_node
6084 && !MAYBE_CLASS_TYPE_P (type))
6086 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
6088 /* We get here with code like `int a (2);' */
6089 init = build_x_compound_expr_from_list (init, ELK_INIT,
6090 tf_warning_or_error);
6093 /* If DECL has an array type without a specific bound, deduce the
6094 array size from the initializer. */
6095 maybe_deduce_size_from_array_init (decl, init);
6096 type = TREE_TYPE (decl);
6097 if (type == error_mark_node)
6100 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
6101 && !(flags & LOOKUP_ALREADY_DIGESTED)
6102 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
6103 && CP_AGGREGATE_TYPE_P (type)
6104 && (CLASS_TYPE_P (type)
6105 || !TYPE_NEEDS_CONSTRUCTING (type)
6106 || type_has_extended_temps (type))))
6108 init_code = build_aggr_init_full_exprs (decl, init, flags);
6110 /* A constructor call is a non-trivial initializer even if
6111 it isn't explicitly written. */
6112 if (TREE_SIDE_EFFECTS (init_code))
6113 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = true;
6115 /* If this is a constexpr initializer, expand_default_init will
6116 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6117 case, pull the initializer back out and pass it down into
6118 store_init_value. */
6119 while (TREE_CODE (init_code) == EXPR_STMT
6120 || TREE_CODE (init_code) == CONVERT_EXPR)
6121 init_code = TREE_OPERAND (init_code, 0);
6122 if (TREE_CODE (init_code) == INIT_EXPR)
6124 init = TREE_OPERAND (init_code, 1);
6125 init_code = NULL_TREE;
6126 /* Don't call digest_init; it's unnecessary and will complain
6127 about aggregate initialization of non-aggregate classes. */
6128 flags |= LOOKUP_ALREADY_DIGESTED;
6130 else if (DECL_DECLARED_CONSTEXPR_P (decl))
6132 /* Declared constexpr, but no suitable initializer; massage
6133 init appropriately so we can pass it into store_init_value
6135 if (CLASS_TYPE_P (type)
6136 && (!init || TREE_CODE (init) == TREE_LIST))
6138 init = build_functional_cast (type, init, tf_none);
6139 if (TREE_CODE (init) == TARGET_EXPR)
6140 TARGET_EXPR_DIRECT_INIT_P (init) = true;
6142 init_code = NULL_TREE;
6148 if (init && TREE_CODE (init) != TREE_VEC)
6150 /* In aggregate initialization of a variable, each element
6151 initialization is a full-expression because there is no
6152 enclosing expression. */
6153 gcc_assert (stmts_are_full_exprs_p ());
6155 init_code = store_init_value (decl, init, cleanups, flags);
6157 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
6158 && DECL_INITIAL (decl)
6159 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
6160 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
6161 warning (0, "array %qD initialized by parenthesized string literal %qE",
6162 decl, DECL_INITIAL (decl));
6168 if (CLASS_TYPE_P (core_type = strip_array_types (type))
6169 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
6170 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
6171 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
6174 check_for_uninitialized_const_var (decl);
6177 if (init && init != error_mark_node)
6178 init_code = build2 (INIT_EXPR, type, decl, init);
6182 /* We might have set these in cp_finish_decl. */
6183 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = false;
6184 TREE_CONSTANT (decl) = false;
6187 if (init_code && DECL_IN_AGGR_P (decl))
6189 static int explained = 0;
6191 if (cxx_dialect < cxx11)
6192 error ("initializer invalid for static member with constructor");
6194 error ("non-constant in-class initialization invalid for static "
6195 "member %qD", decl);
6198 inform (input_location,
6199 "(an out of class initialization is required)");
6208 /* If DECL is not a local variable, give it RTL. */
6211 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
6213 int toplev = toplevel_bindings_p ();
6216 /* Set the DECL_ASSEMBLER_NAME for the object. */
6219 /* The `register' keyword, when used together with an
6220 asm-specification, indicates that the variable should be
6221 placed in a particular register. */
6222 if (VAR_P (decl) && DECL_REGISTER (decl))
6224 set_user_assembler_name (decl, asmspec);
6225 DECL_HARD_REGISTER (decl) = 1;
6229 if (TREE_CODE (decl) == FUNCTION_DECL
6230 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
6231 set_builtin_user_assembler_name (decl, asmspec);
6232 set_user_assembler_name (decl, asmspec);
6236 /* Handle non-variables up front. */
6239 rest_of_decl_compilation (decl, toplev, at_eof);
6243 /* If we see a class member here, it should be a static data
6245 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
6247 gcc_assert (TREE_STATIC (decl));
6248 /* An in-class declaration of a static data member should be
6249 external; it is only a declaration, and not a definition. */
6250 if (init == NULL_TREE)
6251 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
6254 /* We don't create any RTL for local variables. */
6255 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6258 /* We defer emission of local statics until the corresponding
6259 DECL_EXPR is expanded. */
6260 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
6262 /* Defer template instantiations. */
6263 if (DECL_LANG_SPECIFIC (decl)
6264 && DECL_IMPLICIT_INSTANTIATION (decl))
6267 /* If we're not deferring, go ahead and assemble the variable. */
6269 rest_of_decl_compilation (decl, toplev, at_eof);
6272 /* walk_tree helper for wrap_temporary_cleanups, below. */
6275 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
6277 /* Stop at types or full-expression boundaries. */
6278 if (TYPE_P (*stmt_p)
6279 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
6285 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
6287 tree guard = (tree)data;
6288 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
6290 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
6291 /* Tell honor_protect_cleanup_actions to handle this as a separate
6293 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
6295 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
6301 /* We're initializing a local variable which has a cleanup GUARD. If there
6302 are any temporaries used in the initializer INIT of this variable, we
6303 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6304 variable will be cleaned up properly if one of them throws.
6306 Unfortunately, there's no way to express this properly in terms of
6307 nesting, as the regions for the temporaries overlap the region for the
6308 variable itself; if there are two temporaries, the variable needs to be
6309 the first thing destroyed if either of them throws. However, we only
6310 want to run the variable's cleanup if it actually got constructed. So
6311 we need to guard the temporary cleanups with the variable's cleanup if
6312 they are run on the normal path, but not if they are run on the
6313 exceptional path. We implement this by telling
6314 honor_protect_cleanup_actions to strip the variable cleanup from the
6315 exceptional path. */
6318 wrap_temporary_cleanups (tree init, tree guard)
6320 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
6323 /* Generate code to initialize DECL (a local variable). */
6326 initialize_local_var (tree decl, tree init)
6328 tree type = TREE_TYPE (decl);
6332 gcc_assert (VAR_P (decl)
6333 || TREE_CODE (decl) == RESULT_DECL);
6334 gcc_assert (!TREE_STATIC (decl));
6336 if (DECL_SIZE (decl) == NULL_TREE)
6338 /* If we used it already as memory, it must stay in memory. */
6339 DECL_INITIAL (decl) = NULL_TREE;
6340 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
6344 if (type == error_mark_node)
6347 /* Compute and store the initial value. */
6348 already_used = TREE_USED (decl) || TREE_USED (type);
6349 if (TREE_USED (type))
6350 DECL_READ_P (decl) = 1;
6352 /* Generate a cleanup, if necessary. */
6353 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
6355 /* Perform the initialization. */
6358 tree rinit = (TREE_CODE (init) == INIT_EXPR
6359 ? TREE_OPERAND (init, 1) : NULL_TREE);
6360 if (rinit && !TREE_SIDE_EFFECTS (rinit))
6362 /* Stick simple initializers in DECL_INITIAL so that
6363 -Wno-init-self works (c++/34772). */
6364 gcc_assert (TREE_OPERAND (init, 0) == decl);
6365 DECL_INITIAL (decl) = rinit;
6367 if (warn_init_self && TREE_CODE (type) == REFERENCE_TYPE)
6371 warning_at (DECL_SOURCE_LOCATION (decl),
6373 "reference %qD is initialized with itself", decl);
6378 int saved_stmts_are_full_exprs_p;
6380 /* If we're only initializing a single object, guard the
6381 destructors of any temporaries used in its initializer with
6382 its destructor. This isn't right for arrays because each
6383 element initialization is a full-expression. */
6384 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
6385 wrap_temporary_cleanups (init, cleanup);
6387 gcc_assert (building_stmt_list_p ());
6388 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
6389 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
6390 finish_expr_stmt (init);
6391 current_stmt_tree ()->stmts_are_full_exprs_p =
6392 saved_stmts_are_full_exprs_p;
6396 /* Set this to 0 so we can tell whether an aggregate which was
6397 initialized was ever used. Don't do this if it has a
6398 destructor, so we don't complain about the 'resource
6399 allocation is initialization' idiom. Now set
6400 attribute((unused)) on types so decls of that type will be
6401 marked used. (see TREE_USED, above.) */
6402 if (TYPE_NEEDS_CONSTRUCTING (type)
6404 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
6405 && DECL_NAME (decl))
6406 TREE_USED (decl) = 0;
6407 else if (already_used)
6408 TREE_USED (decl) = 1;
6411 finish_decl_cleanup (decl, cleanup);
6414 /* DECL is a VAR_DECL for a compiler-generated variable with static
6415 storage duration (like a virtual table) whose initializer is a
6416 compile-time constant. Initialize the variable and provide it to the
6420 initialize_artificial_var (tree decl, vec<constructor_elt, va_gc> *v)
6423 gcc_assert (DECL_ARTIFICIAL (decl));
6424 init = build_constructor (TREE_TYPE (decl), v);
6425 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
6426 DECL_INITIAL (decl) = init;
6427 DECL_INITIALIZED_P (decl) = 1;
6428 determine_visibility (decl);
6429 layout_var_decl (decl);
6430 maybe_commonize_var (decl);
6431 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
6434 /* INIT is the initializer for a variable, as represented by the
6435 parser. Returns true iff INIT is type-dependent. */
6438 type_dependent_init_p (tree init)
6440 if (TREE_CODE (init) == TREE_LIST)
6441 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6442 return any_type_dependent_elements_p (init);
6443 else if (TREE_CODE (init) == CONSTRUCTOR)
6444 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6446 vec<constructor_elt, va_gc> *elts;
6450 elts = CONSTRUCTOR_ELTS (init);
6451 nelts = vec_safe_length (elts);
6452 for (i = 0; i < nelts; ++i)
6453 if (type_dependent_init_p ((*elts)[i].value))
6457 /* It must be a simple expression, e.g., int i = 3; */
6458 return type_dependent_expression_p (init);
6463 /* INIT is the initializer for a variable, as represented by the
6464 parser. Returns true iff INIT is value-dependent. */
6467 value_dependent_init_p (tree init)
6469 if (TREE_CODE (init) == TREE_LIST)
6470 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6471 return any_value_dependent_elements_p (init);
6472 else if (TREE_CODE (init) == CONSTRUCTOR)
6473 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6475 vec<constructor_elt, va_gc> *elts;
6479 elts = CONSTRUCTOR_ELTS (init);
6480 nelts = vec_safe_length (elts);
6481 for (i = 0; i < nelts; ++i)
6482 if (value_dependent_init_p ((*elts)[i].value))
6486 /* It must be a simple expression, e.g., int i = 3; */
6487 return value_dependent_expression_p (init);
6492 // Returns true if a DECL is VAR_DECL with the concept specifier.
6494 is_concept_var (tree decl)
6496 return (VAR_P (decl)
6497 // Not all variables have DECL_LANG_SPECIFIC.
6498 && DECL_LANG_SPECIFIC (decl)
6499 && DECL_DECLARED_CONCEPT_P (decl));
6502 /* Finish processing of a declaration;
6503 install its line number and initial value.
6504 If the length of an array type is not known before,
6505 it must be determined now, from the initial value, or it is an error.
6507 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6508 true, then INIT is an integral constant expression.
6510 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6511 if the (init) syntax was used. */
6514 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
6515 tree asmspec_tree, int flags)
6518 vec<tree, va_gc> *cleanups = NULL;
6519 const char *asmspec = NULL;
6520 int was_readonly = 0;
6521 bool var_definition_p = false;
6524 if (decl == error_mark_node)
6529 error ("assignment (not initialization) in declaration");
6533 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
6534 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6535 gcc_assert (TREE_CODE (decl) != PARM_DECL);
6537 type = TREE_TYPE (decl);
6538 if (type == error_mark_node)
6541 /* If a name was specified, get the string. */
6542 if (at_namespace_scope_p ())
6543 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
6544 if (asmspec_tree && asmspec_tree != error_mark_node)
6545 asmspec = TREE_STRING_POINTER (asmspec_tree);
6547 if (current_class_type
6548 && CP_DECL_CONTEXT (decl) == current_class_type
6549 && TYPE_BEING_DEFINED (current_class_type)
6550 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
6551 && (DECL_INITIAL (decl) || init))
6552 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
6554 if (TREE_CODE (decl) != FUNCTION_DECL
6555 && (auto_node = type_uses_auto (type)))
6558 if (init == NULL_TREE)
6560 if (DECL_LANG_SPECIFIC (decl)
6561 && DECL_TEMPLATE_INSTANTIATION (decl)
6562 && !DECL_TEMPLATE_INSTANTIATED (decl))
6564 /* init is null because we're deferring instantiating the
6565 initializer until we need it. Well, we need it now. */
6566 instantiate_decl (decl, /*defer_ok*/true, /*expl*/false);
6570 error ("declaration of %q#D has no initializer", decl);
6571 TREE_TYPE (decl) = error_mark_node;
6575 if (TREE_CODE (d_init) == TREE_LIST)
6576 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6577 tf_warning_or_error);
6578 d_init = resolve_nondeduced_context (d_init, tf_warning_or_error);
6579 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6581 tf_warning_or_error,
6583 if (type == error_mark_node)
6585 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
6588 if (!ensure_literal_type_for_constexpr_object (decl))
6589 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6592 && DECL_CLASS_SCOPE_P (decl)
6593 && DECL_INITIALIZED_IN_CLASS_P (decl))
6594 check_static_variable_definition (decl, type);
6596 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6599 if (init == ridpointers[(int)RID_DELETE])
6601 /* FIXME check this is 1st decl. */
6602 DECL_DELETED_FN (decl) = 1;
6603 DECL_DECLARED_INLINE_P (decl) = 1;
6604 DECL_INITIAL (decl) = error_mark_node;
6605 FOR_EACH_CLONE (clone, decl)
6607 DECL_DELETED_FN (clone) = 1;
6608 DECL_DECLARED_INLINE_P (clone) = 1;
6609 DECL_INITIAL (clone) = error_mark_node;
6613 else if (init == ridpointers[(int)RID_DEFAULT])
6615 if (defaultable_fn_check (decl))
6616 DECL_DEFAULTED_FN (decl) = 1;
6618 DECL_INITIAL (decl) = NULL_TREE;
6622 if (init && VAR_P (decl))
6624 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6625 /* If DECL is a reference, then we want to know whether init is a
6626 reference constant; init_const_expr_p as passed tells us whether
6627 it's an rvalue constant. */
6628 if (TREE_CODE (type) == REFERENCE_TYPE)
6629 init_const_expr_p = potential_constant_expression (init);
6630 if (init_const_expr_p)
6632 /* Set these flags now for templates. We'll update the flags in
6633 store_init_value for instantiations. */
6634 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6635 if (decl_maybe_constant_var_p (decl))
6636 TREE_CONSTANT (decl) = 1;
6640 if (processing_template_decl)
6642 bool type_dependent_p;
6644 /* Add this declaration to the statement-tree. */
6645 if (at_function_scope_p ())
6646 add_decl_expr (decl);
6648 type_dependent_p = dependent_type_p (type);
6650 if (check_for_bare_parameter_packs (init))
6653 DECL_INITIAL (decl) = NULL_TREE;
6656 /* Generally, initializers in templates are expanded when the
6657 template is instantiated. But, if DECL is a variable constant
6658 then it can be used in future constant expressions, so its value
6659 must be available. */
6661 if (!VAR_P (decl) || type_dependent_p)
6662 /* We can't do anything if the decl has dependent type. */;
6664 && init_const_expr_p
6665 && TREE_CODE (type) != REFERENCE_TYPE
6666 && decl_maybe_constant_var_p (decl)
6667 && !type_dependent_init_p (init)
6668 && !value_dependent_init_p (init))
6670 /* This variable seems to be a non-dependent constant, so process
6671 its initializer. If check_initializer returns non-null the
6672 initialization wasn't constant after all. */
6674 cleanups = make_tree_vector ();
6675 init_code = check_initializer (decl, init, flags, &cleanups);
6676 if (init_code == NULL_TREE)
6678 release_tree_vector (cleanups);
6680 else if (!init && is_concept_var (decl))
6681 error ("variable concept has no initializer");
6682 else if (!DECL_PRETTY_FUNCTION_P (decl))
6684 /* Deduce array size even if the initializer is dependent. */
6685 maybe_deduce_size_from_array_init (decl, init);
6686 /* And complain about multiple initializers. */
6687 if (init && TREE_CODE (init) == TREE_LIST && TREE_CHAIN (init)
6688 && !MAYBE_CLASS_TYPE_P (type))
6689 init = build_x_compound_expr_from_list (init, ELK_INIT,
6690 tf_warning_or_error);
6694 DECL_INITIAL (decl) = init;
6698 /* Just store non-static data member initializers for later. */
6699 if (init && TREE_CODE (decl) == FIELD_DECL)
6700 DECL_INITIAL (decl) = init;
6702 /* Take care of TYPE_DECLs up front. */
6703 if (TREE_CODE (decl) == TYPE_DECL)
6705 if (type != error_mark_node
6706 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6708 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6709 warning (0, "shadowing previous type declaration of %q#D", decl);
6710 set_identifier_type_value (DECL_NAME (decl), decl);
6713 /* If we have installed this as the canonical typedef for this
6714 type, and that type has not been defined yet, delay emitting
6715 the debug information for it, as we will emit it later. */
6716 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6717 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6718 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6720 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6725 /* A reference will be modified here, as it is initialized. */
6726 if (! DECL_EXTERNAL (decl)
6727 && TREE_READONLY (decl)
6728 && TREE_CODE (type) == REFERENCE_TYPE)
6731 TREE_READONLY (decl) = 0;
6736 /* If this is a local variable that will need a mangled name,
6737 register it now. We must do this before processing the
6738 initializer for the variable, since the initialization might
6739 require a guard variable, and since the mangled name of the
6740 guard variable will depend on the mangled name of this
6742 if (DECL_FUNCTION_SCOPE_P (decl)
6743 && TREE_STATIC (decl)
6744 && !DECL_ARTIFICIAL (decl))
6746 push_local_name (decl);
6747 if (DECL_CONSTRUCTOR_P (current_function_decl)
6748 || DECL_DESTRUCTOR_P (current_function_decl))
6749 /* Normally local_decls is populated during GIMPLE lowering,
6750 but [cd]tors are never actually compiled directly. We need
6751 to put statics on the list so we can deal with the label
6752 address extension. FIXME. */
6753 add_local_decl (cfun, decl);
6754 /* And make sure it's in the symbol table for
6755 c_parse_final_cleanups to find. */
6756 varpool_node::get_create (decl);
6759 /* Convert the initializer to the type of DECL, if we have not
6760 already initialized DECL. */
6761 if (!DECL_INITIALIZED_P (decl)
6762 /* If !DECL_EXTERNAL then DECL is being defined. In the
6763 case of a static data member initialized inside the
6764 class-specifier, there can be an initializer even if DECL
6765 is *not* defined. */
6766 && (!DECL_EXTERNAL (decl) || init))
6768 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6771 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6772 /* Allow libjava/prims.cc define primitive classes. */
6773 if (init != NULL_TREE
6774 || jclass == NULL_TREE
6775 || TREE_CODE (jclass) != TYPE_DECL
6776 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6777 || !same_type_ignoring_top_level_qualifiers_p
6778 (type, TREE_TYPE (TREE_TYPE (jclass))))
6779 error ("Java object %qD not allocated with %<new%>", decl);
6782 cleanups = make_tree_vector ();
6783 init = check_initializer (decl, init, flags, &cleanups);
6789 The memory occupied by any object of static storage
6790 duration is zero-initialized at program startup before
6791 any other initialization takes place.
6793 We cannot create an appropriate initializer until after
6794 the type of DECL is finalized. If DECL_INITIAL is set,
6795 then the DECL is statically initialized, and any
6796 necessary zero-initialization has already been performed. */
6797 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6798 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6799 /*nelts=*/NULL_TREE,
6800 /*static_storage_p=*/true);
6801 /* Remember that the initialization for this variable has
6803 DECL_INITIALIZED_P (decl) = 1;
6804 /* This declaration is the definition of this variable,
6805 unless we are initializing a static data member within
6806 the class specifier. */
6807 if (!DECL_EXTERNAL (decl))
6808 var_definition_p = true;
6810 /* If the variable has an array type, lay out the type, even if
6811 there is no initializer. It is valid to index through the
6812 array, and we must get TYPE_ALIGN set correctly on the array
6814 else if (TREE_CODE (type) == ARRAY_TYPE)
6817 if (TREE_STATIC (decl)
6818 && !at_function_scope_p ()
6819 && current_function_decl == NULL)
6820 /* So decl is a global variable or a static member of a
6821 non local class. Record the types it uses
6822 so that we can decide later to emit debug info for them. */
6823 record_types_used_by_current_var_decl (decl);
6825 else if (TREE_CODE (decl) == FIELD_DECL
6826 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6827 error ("non-static data member %qD has Java class type", decl);
6829 /* Add this declaration to the statement-tree. This needs to happen
6830 after the call to check_initializer so that the DECL_EXPR for a
6831 reference temp is added before the DECL_EXPR for the reference itself. */
6832 if (DECL_FUNCTION_SCOPE_P (decl))
6834 /* If we're building a variable sized type, and we might be
6835 reachable other than via the top of the current binding
6836 level, then create a new BIND_EXPR so that we deallocate
6837 the object at the right time. */
6840 && !TREE_CONSTANT (DECL_SIZE (decl))
6841 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
6844 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
6845 TREE_SIDE_EFFECTS (bind) = 1;
6847 BIND_EXPR_BODY (bind) = push_stmt_list ();
6849 add_decl_expr (decl);
6852 /* Let the middle end know about variables and functions -- but not
6853 static data members in uninstantiated class templates. */
6854 if (VAR_OR_FUNCTION_DECL_P (decl))
6858 layout_var_decl (decl);
6859 maybe_commonize_var (decl);
6862 /* This needs to happen after the linkage is set. */
6863 determine_visibility (decl);
6865 if (var_definition_p && TREE_STATIC (decl))
6867 /* If a TREE_READONLY variable needs initialization
6868 at runtime, it is no longer readonly and we need to
6869 avoid MEM_READONLY_P being set on RTL created for it. */
6872 if (TREE_READONLY (decl))
6873 TREE_READONLY (decl) = 0;
6876 else if (was_readonly)
6877 TREE_READONLY (decl) = 1;
6879 /* Likewise if it needs destruction. */
6880 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
6881 TREE_READONLY (decl) = 0;
6884 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6886 /* Check for abstractness of the type. Notice that there is no
6887 need to strip array types here since the check for those types
6888 is already done within create_array_type_for_decl. */
6889 abstract_virtuals_error (decl, type);
6891 if (TREE_TYPE (decl) == error_mark_node)
6892 /* No initialization required. */
6894 else if (TREE_CODE (decl) == FUNCTION_DECL)
6898 if (init == ridpointers[(int)RID_DEFAULT])
6900 /* An out-of-class default definition is defined at
6901 the point where it is explicitly defaulted. */
6902 if (DECL_DELETED_FN (decl))
6903 maybe_explain_implicit_delete (decl);
6904 else if (DECL_INITIAL (decl) == error_mark_node)
6905 synthesize_method (decl);
6908 error ("function %q#D is initialized like a variable", decl);
6910 /* else no initialization required. */
6912 else if (DECL_EXTERNAL (decl)
6913 && ! (DECL_LANG_SPECIFIC (decl)
6914 && DECL_NOT_REALLY_EXTERN (decl)))
6917 DECL_INITIAL (decl) = init;
6919 /* A variable definition. */
6920 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6921 /* Initialize the local variable. */
6922 initialize_local_var (decl, init);
6924 /* If a variable is defined, and then a subsequent
6925 definition with external linkage is encountered, we will
6926 get here twice for the same variable. We want to avoid
6927 calling expand_static_init more than once. For variables
6928 that are not static data members, we can call
6929 expand_static_init only when we actually process the
6930 initializer. It is not legal to redeclare a static data
6931 member, so this issue does not arise in that case. */
6932 else if (var_definition_p && TREE_STATIC (decl))
6933 expand_static_init (decl, init);
6936 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6937 reference, insert it in the statement-tree now. */
6941 FOR_EACH_VEC_ELT (*cleanups, i, t)
6942 push_cleanup (decl, t, false);
6943 release_tree_vector (cleanups);
6947 TREE_READONLY (decl) = 1;
6949 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6952 /* Returns a declaration for a VAR_DECL as if:
6954 extern "C" TYPE NAME;
6956 had been seen. Used to create compiler-generated global
6960 declare_global_var (tree name, tree type)
6964 push_to_top_level ();
6965 decl = build_decl (input_location, VAR_DECL, name, type);
6966 TREE_PUBLIC (decl) = 1;
6967 DECL_EXTERNAL (decl) = 1;
6968 DECL_ARTIFICIAL (decl) = 1;
6969 /* If the user has explicitly declared this variable (perhaps
6970 because the code we are compiling is part of a low-level runtime
6971 library), then it is possible that our declaration will be merged
6972 with theirs by pushdecl. */
6973 decl = pushdecl (decl);
6974 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6975 pop_from_top_level ();
6980 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6981 if "__cxa_atexit" is not being used) corresponding to the function
6982 to be called when the program exits. */
6985 get_atexit_fn_ptr_type (void)
6989 if (!atexit_fn_ptr_type_node)
6992 if (flag_use_cxa_atexit
6993 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6994 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6995 arg_type = ptr_type_node;
6997 /* The parameter to "atexit" is "void (*)(void)". */
6998 arg_type = NULL_TREE;
7000 fn_type = build_function_type_list (void_type_node,
7001 arg_type, NULL_TREE);
7002 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
7005 return atexit_fn_ptr_type_node;
7008 /* Returns a pointer to the `atexit' function. Note that if
7009 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7010 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7013 get_atexit_node (void)
7019 bool use_aeabi_atexit;
7024 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
7026 /* The declaration for `__cxa_atexit' is:
7028 int __cxa_atexit (void (*)(void *), void *, void *)
7030 We build up the argument types and then the function type
7032 tree argtype0, argtype1, argtype2;
7034 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
7035 /* First, build the pointer-to-function type for the first
7037 fn_ptr_type = get_atexit_fn_ptr_type ();
7038 /* Then, build the rest of the argument types. */
7039 argtype2 = ptr_type_node;
7040 if (use_aeabi_atexit)
7042 argtype1 = fn_ptr_type;
7043 argtype0 = ptr_type_node;
7047 argtype1 = ptr_type_node;
7048 argtype0 = fn_ptr_type;
7050 /* And the final __cxa_atexit type. */
7051 fn_type = build_function_type_list (integer_type_node,
7052 argtype0, argtype1, argtype2,
7054 if (use_aeabi_atexit)
7055 name = "__aeabi_atexit";
7057 name = "__cxa_atexit";
7061 /* The declaration for `atexit' is:
7063 int atexit (void (*)());
7065 We build up the argument types and then the function type
7067 fn_ptr_type = get_atexit_fn_ptr_type ();
7068 /* Build the final atexit type. */
7069 fn_type = build_function_type_list (integer_type_node,
7070 fn_ptr_type, NULL_TREE);
7074 /* Now, build the function declaration. */
7075 push_lang_context (lang_name_c);
7076 atexit_fndecl = build_library_fn_ptr (name, fn_type, ECF_LEAF | ECF_NOTHROW);
7077 mark_used (atexit_fndecl);
7078 pop_lang_context ();
7079 atexit_node = decay_conversion (atexit_fndecl, tf_warning_or_error);
7084 /* Like get_atexit_node, but for thread-local cleanups. */
7087 get_thread_atexit_node (void)
7089 /* The declaration for `__cxa_thread_atexit' is:
7091 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7092 tree fn_type = build_function_type_list (integer_type_node,
7093 get_atexit_fn_ptr_type (),
7094 ptr_type_node, ptr_type_node,
7097 /* Now, build the function declaration. */
7098 tree atexit_fndecl = build_library_fn_ptr ("__cxa_thread_atexit", fn_type,
7099 ECF_LEAF | ECF_NOTHROW);
7100 return decay_conversion (atexit_fndecl, tf_warning_or_error);
7103 /* Returns the __dso_handle VAR_DECL. */
7106 get_dso_handle_node (void)
7108 if (dso_handle_node)
7109 return dso_handle_node;
7111 /* Declare the variable. */
7112 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
7115 #ifdef HAVE_GAS_HIDDEN
7116 if (dso_handle_node != error_mark_node)
7118 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
7119 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
7123 return dso_handle_node;
7126 /* Begin a new function with internal linkage whose job will be simply
7127 to destroy some particular variable. */
7129 static GTY(()) int start_cleanup_cnt;
7132 start_cleanup_fn (void)
7137 bool use_cxa_atexit = flag_use_cxa_atexit
7138 && !targetm.cxx.use_atexit_for_cxa_atexit ();
7140 push_to_top_level ();
7142 /* No need to mangle this. */
7143 push_lang_context (lang_name_c);
7145 /* Build the name of the function. */
7146 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
7147 /* Build the function declaration. */
7148 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
7149 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
7150 /* It's a function with internal linkage, generated by the
7152 TREE_PUBLIC (fndecl) = 0;
7153 DECL_ARTIFICIAL (fndecl) = 1;
7154 /* Make the function `inline' so that it is only emitted if it is
7155 actually needed. It is unlikely that it will be inlined, since
7156 it is only called via a function pointer, but we avoid unnecessary
7157 emissions this way. */
7158 DECL_DECLARED_INLINE_P (fndecl) = 1;
7159 DECL_INTERFACE_KNOWN (fndecl) = 1;
7160 /* Build the parameter. */
7165 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
7166 DECL_CONTEXT (parmdecl) = fndecl;
7167 TREE_USED (parmdecl) = 1;
7168 DECL_READ_P (parmdecl) = 1;
7169 DECL_ARGUMENTS (fndecl) = parmdecl;
7173 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
7175 pop_lang_context ();
7177 return current_function_decl;
7180 /* Finish the cleanup function begun by start_cleanup_fn. */
7183 end_cleanup_fn (void)
7185 expand_or_defer_fn (finish_function (0));
7187 pop_from_top_level ();
7190 /* Generate code to handle the destruction of DECL, an object with
7191 static storage duration. */
7194 register_dtor_fn (tree decl)
7201 bool ob_parm, dso_parm, use_dtor;
7202 tree arg0, arg1, arg2;
7205 type = TREE_TYPE (decl);
7206 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
7209 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7210 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7211 destructor to "__cxa_atexit"; we don't have to build a temporary
7212 function to do the cleanup. */
7213 dso_parm = (flag_use_cxa_atexit
7214 && !targetm.cxx.use_atexit_for_cxa_atexit ());
7215 ob_parm = (CP_DECL_THREAD_LOCAL_P (decl) || dso_parm);
7216 use_dtor = ob_parm && CLASS_TYPE_P (type);
7221 /* Find the destructor. */
7222 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
7223 gcc_assert (idx >= 0);
7224 cleanup = (*CLASSTYPE_METHOD_VEC (type))[idx];
7225 /* Make sure it is accessible. */
7226 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup,
7227 tf_warning_or_error);
7231 /* Call build_cleanup before we enter the anonymous function so
7232 that any access checks will be done relative to the current
7233 scope, rather than the scope of the anonymous function. */
7234 build_cleanup (decl);
7236 /* Now start the function. */
7237 cleanup = start_cleanup_fn ();
7239 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7240 to the original function, rather than the anonymous one. That
7241 will make the back end think that nested functions are in use,
7242 which causes confusion. */
7243 push_deferring_access_checks (dk_no_check);
7244 fcall = build_cleanup (decl);
7245 pop_deferring_access_checks ();
7247 /* Create the body of the anonymous function. */
7248 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
7249 finish_expr_stmt (fcall);
7250 finish_compound_stmt (compound_stmt);
7254 /* Call atexit with the cleanup function. */
7255 mark_used (cleanup);
7256 cleanup = build_address (cleanup);
7258 if (CP_DECL_THREAD_LOCAL_P (decl))
7259 atex_node = get_thread_atexit_node ();
7261 atex_node = get_atexit_node ();
7265 /* We must convert CLEANUP to the type that "__cxa_atexit"
7267 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
7268 /* "__cxa_atexit" will pass the address of DECL to the
7269 cleanup function. */
7271 addr = build_address (decl);
7272 /* The declared type of the parameter to "__cxa_atexit" is
7273 "void *". For plain "T*", we could just let the
7274 machinery in cp_build_function_call convert it -- but if the
7275 type is "cv-qualified T *", then we need to convert it
7276 before passing it in, to avoid spurious errors. */
7277 addr = build_nop (ptr_type_node, addr);
7280 /* Since the cleanup functions we build ignore the address
7281 they're given, there's no reason to pass the actual address
7282 in, and, in general, it's cheaper to pass NULL than any
7284 addr = null_pointer_node;
7287 arg2 = cp_build_addr_expr (get_dso_handle_node (),
7288 tf_warning_or_error);
7290 /* Just pass NULL to the dso handle parm if we don't actually
7291 have a DSO handle on this target. */
7292 arg2 = null_pointer_node;
7298 if (!CP_DECL_THREAD_LOCAL_P (decl)
7299 && targetm.cxx.use_aeabi_atexit ())
7315 return cp_build_function_call_nary (atex_node, tf_warning_or_error,
7316 arg0, arg1, arg2, NULL_TREE);
7319 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7320 is its initializer. Generate code to handle the construction
7321 and destruction of DECL. */
7324 expand_static_init (tree decl, tree init)
7326 gcc_assert (VAR_P (decl));
7327 gcc_assert (TREE_STATIC (decl));
7329 /* Some variables require no dynamic initialization. */
7330 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
7332 /* Make sure the destructor is callable. */
7333 cxx_maybe_build_cleanup (decl, tf_warning_or_error);
7338 if (CP_DECL_THREAD_LOCAL_P (decl) && DECL_GNU_TLS_P (decl)
7339 && !DECL_FUNCTION_SCOPE_P (decl))
7342 error ("non-local variable %qD declared %<__thread%> "
7343 "needs dynamic initialization", decl);
7345 error ("non-local variable %qD declared %<__thread%> "
7346 "has a non-trivial destructor", decl);
7347 static bool informed;
7350 inform (DECL_SOURCE_LOCATION (decl),
7351 "C++11 %<thread_local%> allows dynamic initialization "
7358 if (DECL_FUNCTION_SCOPE_P (decl))
7360 /* Emit code to perform this initialization but once. */
7361 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
7362 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
7363 tree guard, guard_addr;
7365 /* We don't need thread-safety code for thread-local vars. */
7366 bool thread_guard = (flag_threadsafe_statics
7367 && !CP_DECL_THREAD_LOCAL_P (decl));
7369 /* Emit code to perform this initialization but once. This code
7372 static <type> guard;
7373 if (!__atomic_load (guard.first_byte)) {
7374 if (__cxa_guard_acquire (&guard)) {
7377 // Do initialization.
7378 flag = true; __cxa_guard_release (&guard);
7379 // Register variable for destruction at end of program.
7381 if (!flag) __cxa_guard_abort (&guard);
7385 Note that the `flag' variable is only set to 1 *after* the
7386 initialization is complete. This ensures that an exception,
7387 thrown during the construction, will cause the variable to
7388 reinitialized when we pass through this code again, as per:
7392 If the initialization exits by throwing an exception, the
7393 initialization is not complete, so it will be tried again
7394 the next time control enters the declaration.
7396 This process should be thread-safe, too; multiple threads
7397 should not be able to initialize the variable more than
7400 /* Create the guard variable. */
7401 guard = get_guard (decl);
7403 /* Begin the conditional initialization. */
7404 if_stmt = begin_if_stmt ();
7406 finish_if_stmt_cond (get_guard_cond (guard, thread_guard), if_stmt);
7407 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
7411 tree vfntype = NULL_TREE;
7412 tree acquire_name, release_name, abort_name;
7413 tree acquire_fn, release_fn, abort_fn;
7414 guard_addr = build_address (guard);
7416 acquire_name = get_identifier ("__cxa_guard_acquire");
7417 release_name = get_identifier ("__cxa_guard_release");
7418 abort_name = get_identifier ("__cxa_guard_abort");
7419 acquire_fn = identifier_global_value (acquire_name);
7420 release_fn = identifier_global_value (release_name);
7421 abort_fn = identifier_global_value (abort_name);
7423 acquire_fn = push_library_fn
7424 (acquire_name, build_function_type_list (integer_type_node,
7425 TREE_TYPE (guard_addr),
7427 NULL_TREE, ECF_NOTHROW | ECF_LEAF);
7428 if (!release_fn || !abort_fn)
7429 vfntype = build_function_type_list (void_type_node,
7430 TREE_TYPE (guard_addr),
7433 release_fn = push_library_fn (release_name, vfntype, NULL_TREE,
7434 ECF_NOTHROW | ECF_LEAF);
7436 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE,
7437 ECF_NOTHROW | ECF_LEAF);
7439 inner_if_stmt = begin_if_stmt ();
7440 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
7443 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
7444 begin = get_target_expr (boolean_false_node);
7445 flag = TARGET_EXPR_SLOT (begin);
7447 TARGET_EXPR_CLEANUP (begin)
7448 = build3 (COND_EXPR, void_type_node, flag,
7450 build_call_n (abort_fn, 1, guard_addr));
7451 CLEANUP_EH_ONLY (begin) = 1;
7453 /* Do the initialization itself. */
7454 init = add_stmt_to_compound (begin, init);
7455 init = add_stmt_to_compound
7456 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
7457 init = add_stmt_to_compound
7458 (init, build_call_n (release_fn, 1, guard_addr));
7461 init = add_stmt_to_compound (init, set_guard (guard));
7463 /* Use atexit to register a function for destroying this static
7465 init = add_stmt_to_compound (init, register_dtor_fn (decl));
7467 finish_expr_stmt (init);
7471 finish_compound_stmt (inner_then_clause);
7472 finish_then_clause (inner_if_stmt);
7473 finish_if_stmt (inner_if_stmt);
7476 finish_compound_stmt (then_clause);
7477 finish_then_clause (if_stmt);
7478 finish_if_stmt (if_stmt);
7480 else if (CP_DECL_THREAD_LOCAL_P (decl))
7481 tls_aggregates = tree_cons (init, decl, tls_aggregates);
7483 static_aggregates = tree_cons (init, decl, static_aggregates);
7487 /* Make TYPE a complete type based on INITIAL_VALUE.
7488 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
7489 2 if there was no information (in which case assume 0 if DO_DEFAULT),
7490 3 if the initializer list is empty (in pedantic mode). */
7493 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
7496 tree type, elt_type;
7498 /* Don't get confused by a CONSTRUCTOR for some other type. */
7499 if (initial_value && TREE_CODE (initial_value) == CONSTRUCTOR
7500 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value)
7501 && TREE_CODE (TREE_TYPE (initial_value)) != ARRAY_TYPE)
7506 unsigned HOST_WIDE_INT i;
7509 /* An array of character type can be initialized from a
7510 brace-enclosed string constant.
7512 FIXME: this code is duplicated from reshape_init. Probably
7513 we should just call reshape_init here? */
7514 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
7515 && TREE_CODE (initial_value) == CONSTRUCTOR
7516 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value)))
7518 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initial_value);
7519 tree value = (*v)[0].value;
7521 if (TREE_CODE (value) == STRING_CST
7522 && v->length () == 1)
7523 initial_value = value;
7526 /* If any of the elements are parameter packs, we can't actually
7527 complete this type now because the array size is dependent. */
7528 if (TREE_CODE (initial_value) == CONSTRUCTOR)
7530 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
7533 if (PACK_EXPANSION_P (value))
7539 failure = complete_array_type (ptype, initial_value, do_default);
7541 /* We can create the array before the element type is complete, which
7542 means that we didn't have these two bits set in the original type
7543 either. In completing the type, we are expected to propagate these
7544 bits. See also complete_type which does the same thing for arrays
7547 if (TYPE_DOMAIN (type))
7549 elt_type = TREE_TYPE (type);
7550 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
7551 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
7552 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
7558 /* As above, but either give an error or reject zero-size arrays, depending
7562 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
7563 bool do_default, tsubst_flags_t complain)
7566 bool sfinae = !(complain & tf_error);
7567 /* In SFINAE context we can't be lenient about zero-size arrays. */
7570 failure = cp_complete_array_type (ptype, initial_value, do_default);
7576 /* Not an error. */;
7577 else if (failure == 1)
7578 error ("initializer fails to determine size of %qT", *ptype);
7579 else if (failure == 2)
7582 error ("array size missing in %qT", *ptype);
7584 else if (failure == 3)
7585 error ("zero-size array %qT", *ptype);
7586 *ptype = error_mark_node;
7591 /* Return zero if something is declared to be a member of type
7592 CTYPE when in the context of CUR_TYPE. STRING is the error
7593 message to print in that case. Otherwise, quietly return 1. */
7596 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
7598 if (ctype && ctype != cur_type)
7600 if (flags == DTOR_FLAG)
7601 error ("destructor for alien class %qT cannot be a member", ctype);
7603 error ("constructor for alien class %qT cannot be a member", ctype);
7609 /* Subroutine of `grokdeclarator'. */
7611 /* Generate errors possibly applicable for a given set of specifiers.
7612 This is for ARM $7.1.2. */
7615 bad_specifiers (tree object,
7616 enum bad_spec_place type,
7627 error ("%qD declared as a %<virtual%> variable", object);
7629 error ("%qD declared as an %<inline%> variable", object);
7631 error ("%<const%> and %<volatile%> function specifiers on "
7632 "%qD invalid in variable declaration", object);
7636 error ("%qD declared as a %<virtual%> parameter", object);
7638 error ("%qD declared as an %<inline%> parameter", object);
7640 error ("%<const%> and %<volatile%> function specifiers on "
7641 "%qD invalid in parameter declaration", object);
7645 error ("%qD declared as a %<virtual%> type", object);
7647 error ("%qD declared as an %<inline%> type", object);
7649 error ("%<const%> and %<volatile%> function specifiers on "
7650 "%qD invalid in type declaration", object);
7654 error ("%qD declared as a %<virtual%> field", object);
7656 error ("%qD declared as an %<inline%> field", object);
7658 error ("%<const%> and %<volatile%> function specifiers on "
7659 "%qD invalid in field declaration", object);
7665 error ("%q+D declared as a friend", object);
7667 && (TREE_CODE (object) == TYPE_DECL
7668 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7669 && !TYPE_REFFN_P (TREE_TYPE (object))
7670 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7671 error ("%q+D declared with an exception specification", object);
7674 /* DECL is a member function or static data member and is presently
7675 being defined. Check that the definition is taking place in a
7679 check_class_member_definition_namespace (tree decl)
7681 /* These checks only apply to member functions and static data
7683 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
7684 /* We check for problems with specializations in pt.c in
7685 check_specialization_namespace, where we can issue better
7687 if (processing_specialization)
7689 /* There are no restrictions on the placement of
7690 explicit instantiations. */
7691 if (processing_explicit_instantiation)
7695 A member function definition that appears outside of the
7696 class definition shall appear in a namespace scope enclosing
7697 the class definition.
7701 The definition for a static data member shall appear in a
7702 namespace scope enclosing the member's class definition. */
7703 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7704 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7705 decl, DECL_CONTEXT (decl));
7708 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7709 METHOD_TYPE for a non-static member function; QUALS are the
7710 cv-qualifiers that apply to the function. */
7713 build_this_parm (tree type, cp_cv_quals quals)
7718 cp_cv_quals this_quals;
7720 if (CLASS_TYPE_P (type))
7723 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7724 this_type = build_pointer_type (this_type);
7727 this_type = type_of_this_parm (type);
7728 /* The `this' parameter is implicitly `const'; it cannot be
7730 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7731 qual_type = cp_build_qualified_type (this_type, this_quals);
7732 parm = build_artificial_parm (this_identifier, qual_type);
7733 cp_apply_type_quals_to_decl (this_quals, parm);
7737 /* DECL is a static member function. Complain if it was declared
7738 with function-cv-quals. */
7741 check_static_quals (tree decl, cp_cv_quals quals)
7743 if (quals != TYPE_UNQUALIFIED)
7744 error ("static member function %q#D declared with type qualifiers",
7748 // Check that FN takes no arguments and returns bool.
7750 check_concept_fn (tree fn)
7752 // A constraint is nullary.
7753 if (DECL_ARGUMENTS (fn))
7754 error ("concept %q#D declared with function parameters", fn);
7756 // The declared return type of the concept shall be bool, and
7757 // it shall not be deduced from it definition.
7758 tree type = TREE_TYPE (TREE_TYPE (fn));
7760 error ("concept %q#D declared with a deduced return type", fn);
7761 else if (type != boolean_type_node)
7762 error ("concept %q#D with non-%<bool%> return type %qT", fn, type);
7765 /* Helper function. Replace the temporary this parameter injected
7766 during cp_finish_omp_declare_simd with the real this parameter. */
7769 declare_simd_adjust_this (tree *tp, int *walk_subtrees, void *data)
7771 tree this_parm = (tree) data;
7772 if (TREE_CODE (*tp) == PARM_DECL
7773 && DECL_NAME (*tp) == this_identifier
7774 && *tp != this_parm)
7776 else if (TYPE_P (*tp))
7781 /* CTYPE is class type, or null if non-class.
7782 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7784 DECLARATOR is the function's name.
7785 PARMS is a chain of PARM_DECLs for the function.
7786 VIRTUALP is truthvalue of whether the function is virtual or not.
7787 FLAGS are to be passed through to `grokclassfn'.
7788 QUALS are qualifiers indicating whether the function is `const'
7790 RAISES is a list of exceptions that this function can raise.
7791 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7792 not look, and -1 if we should not call `grokclassfn' at all.
7794 SFK is the kind of special function (if any) for the new function.
7796 Returns `NULL_TREE' if something goes wrong, after issuing
7797 applicable error messages. */
7800 grokfndecl (tree ctype,
7804 tree orig_declarator,
7807 enum overload_flags flags,
7809 cp_ref_qualifier rqual,
7816 special_function_kind sfk,
7821 location_t location)
7824 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7827 // Was the concept specifier present?
7828 bool concept_p = inlinep & 4;
7830 // Concept declarations must have a corresponding definition.
7831 if (concept_p && !funcdef_flag)
7833 error ("concept %qD has no definition", declarator);
7838 type = build_ref_qualified_type (type, rqual);
7840 type = build_exception_variant (type, raises);
7842 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7844 /* Set the constraints on the declaration. */
7847 tree tmpl_reqs = NULL_TREE;
7848 if (processing_template_decl > template_class_depth (ctype))
7849 tmpl_reqs = TEMPLATE_PARMS_CONSTRAINTS (current_template_parms);
7851 /* Adjust the required expression into a constraint. */
7853 decl_reqs = make_predicate_constraint (decl_reqs);
7855 tree ci = build_constraints (tmpl_reqs, decl_reqs);
7856 set_constraints (decl, ci);
7859 /* If we have an explicit location, use it, otherwise use whatever
7860 build_lang_decl used (probably input_location). */
7861 if (location != UNKNOWN_LOCATION)
7862 DECL_SOURCE_LOCATION (decl) = location;
7864 if (TREE_CODE (type) == METHOD_TYPE)
7867 parm = build_this_parm (type, quals);
7868 DECL_CHAIN (parm) = parms;
7871 /* Allocate space to hold the vptr bit if needed. */
7872 DECL_ALIGN (decl) = MINIMUM_METHOD_BOUNDARY;
7874 DECL_ARGUMENTS (decl) = parms;
7875 for (t = parms; t; t = DECL_CHAIN (t))
7876 DECL_CONTEXT (t) = decl;
7877 /* Propagate volatile out from type to decl. */
7878 if (TYPE_VOLATILE (type))
7879 TREE_THIS_VOLATILE (decl) = 1;
7881 /* Setup decl according to sfk. */
7884 case sfk_constructor:
7885 case sfk_copy_constructor:
7886 case sfk_move_constructor:
7887 DECL_CONSTRUCTOR_P (decl) = 1;
7889 case sfk_destructor:
7890 DECL_DESTRUCTOR_P (decl) = 1;
7897 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7901 ("defining explicit specialization %qD in friend declaration",
7905 tree fns = TREE_OPERAND (orig_declarator, 0);
7906 tree args = TREE_OPERAND (orig_declarator, 1);
7908 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7910 /* Something like `template <class T> friend void f<T>()'. */
7911 error ("invalid use of template-id %qD in declaration "
7912 "of primary template",
7918 /* A friend declaration of the form friend void f<>(). Record
7919 the information in the TEMPLATE_ID_EXPR. */
7920 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7922 gcc_assert (identifier_p (fns) || TREE_CODE (fns) == OVERLOAD);
7923 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7925 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7926 if (TREE_PURPOSE (t)
7927 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7929 error ("default arguments are not allowed in declaration "
7930 "of friend template specialization %qD",
7937 error ("%<inline%> is not allowed in declaration of friend "
7938 "template specialization %qD",
7945 /* If this decl has namespace scope, set that up. */
7947 set_decl_namespace (decl, in_namespace, friendp);
7949 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7951 /* `main' and builtins have implicit 'C' linkage. */
7952 if ((MAIN_NAME_P (declarator)
7953 || (IDENTIFIER_LENGTH (declarator) > 10
7954 && IDENTIFIER_POINTER (declarator)[0] == '_'
7955 && IDENTIFIER_POINTER (declarator)[1] == '_'
7956 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0)
7957 || (targetcm.cxx_implicit_extern_c
7958 && targetcm.cxx_implicit_extern_c(IDENTIFIER_POINTER (declarator))))
7959 && current_lang_name == lang_name_cplusplus
7960 && ctype == NULL_TREE
7961 && DECL_FILE_SCOPE_P (decl))
7962 SET_DECL_LANGUAGE (decl, lang_c);
7964 /* Should probably propagate const out from type to decl I bet (mrs). */
7967 DECL_STATIC_FUNCTION_P (decl) = 1;
7968 DECL_CONTEXT (decl) = ctype;
7972 DECL_DELETED_FN (decl) = 1;
7976 DECL_CONTEXT (decl) = ctype;
7978 check_class_member_definition_namespace (decl);
7981 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7983 if (PROCESSING_REAL_TEMPLATE_DECL_P())
7984 error ("cannot declare %<::main%> to be a template");
7986 error ("cannot declare %<::main%> to be inline");
7988 error ("cannot declare %<::main%> to be constexpr");
7990 error ("cannot declare %<::main%> to be static");
7995 /* Members of anonymous types and local classes have no linkage; make
7996 them internal. If a typedef is made later, this will be changed. */
7997 if (ctype && (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype))
7998 || decl_function_context (TYPE_MAIN_DECL (ctype))))
8001 if (publicp && cxx_dialect == cxx98)
8003 /* [basic.link]: A name with no linkage (notably, the name of a class
8004 or enumeration declared in a local scope) shall not be used to
8005 declare an entity with linkage.
8007 DR 757 relaxes this restriction for C++0x. */
8008 no_linkage_error (decl);
8011 TREE_PUBLIC (decl) = publicp;
8014 DECL_INTERFACE_KNOWN (decl) = 1;
8015 DECL_NOT_REALLY_EXTERN (decl) = 1;
8018 /* If the declaration was declared inline, mark it as such. */
8021 DECL_DECLARED_INLINE_P (decl) = 1;
8023 DECL_COMDAT (decl) = 1;
8026 DECL_DECLARED_CONSTEXPR_P (decl) = true;
8028 // If the concept declaration specifier was found, check
8029 // that the declaration satisfies the necessary requirements.
8032 DECL_DECLARED_CONCEPT_P (decl) = true;
8033 check_concept_fn (decl);
8036 DECL_EXTERNAL (decl) = 1;
8037 if (TREE_CODE (type) == FUNCTION_TYPE)
8040 TREE_TYPE (decl) = apply_memfn_quals (TREE_TYPE (decl),
8047 ? G_("static member function %qD cannot have cv-qualifier")
8048 : G_("non-member function %qD cannot have cv-qualifier"),
8050 quals = TYPE_UNQUALIFIED;
8056 ? G_("static member function %qD cannot have ref-qualifier")
8057 : G_("non-member function %qD cannot have ref-qualifier"),
8059 rqual = REF_QUAL_NONE;
8063 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
8064 && !grok_op_properties (decl, /*complain=*/true))
8066 else if (UDLIT_OPER_P (DECL_NAME (decl)))
8068 bool long_long_unsigned_p;
8070 const char *suffix = NULL;
8071 /* [over.literal]/6: Literal operators shall not have C linkage. */
8072 if (DECL_LANGUAGE (decl) == lang_c)
8074 error ("literal operator with C linkage");
8078 if (DECL_NAMESPACE_SCOPE_P (decl))
8080 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
8083 error ("%qD has invalid argument list", decl);
8087 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
8088 if (long_long_unsigned_p)
8090 if (cpp_interpret_int_suffix (parse_in, suffix, strlen (suffix)))
8091 warning (0, "integer suffix %<%s%>"
8092 " shadowed by implementation", suffix);
8094 else if (long_double_p)
8096 if (cpp_interpret_float_suffix (parse_in, suffix, strlen (suffix)))
8097 warning (0, "floating point suffix %<%s%>"
8098 " shadowed by implementation", suffix);
8103 error ("%qD must be a non-member function", decl);
8109 /* Make the init_value nonzero so pushdecl knows this is not
8110 tentative. error_mark_node is replaced later with the BLOCK. */
8111 DECL_INITIAL (decl) = error_mark_node;
8113 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
8114 TREE_NOTHROW (decl) = 1;
8116 if (flag_openmp || flag_openmp_simd || flag_cilkplus)
8118 /* Adjust "omp declare simd" attributes. */
8119 tree ods = lookup_attribute ("omp declare simd", *attrlist);
8123 for (attr = ods; attr;
8124 attr = lookup_attribute ("omp declare simd", TREE_CHAIN (attr)))
8126 if (TREE_CODE (type) == METHOD_TYPE)
8127 walk_tree (&TREE_VALUE (attr), declare_simd_adjust_this,
8128 DECL_ARGUMENTS (decl), NULL);
8129 if (TREE_VALUE (attr) != NULL_TREE)
8131 tree cl = TREE_VALUE (TREE_VALUE (attr));
8132 cl = c_omp_declare_simd_clauses_to_numbers
8133 (DECL_ARGUMENTS (decl), cl);
8135 TREE_VALUE (TREE_VALUE (attr)) = cl;
8137 TREE_VALUE (attr) = NULL_TREE;
8143 /* Caller will do the rest of this. */
8147 if (ctype != NULL_TREE)
8148 grokclassfn (ctype, decl, flags);
8151 if (cxx_dialect >= cxx11
8152 && DECL_DESTRUCTOR_P (decl)
8153 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))
8154 && !processing_template_decl)
8155 deduce_noexcept_on_destructor (decl);
8157 decl = check_explicit_specialization (orig_declarator, decl,
8160 4 * (friendp != 0) +
8162 if (decl == error_mark_node)
8165 if (DECL_STATIC_FUNCTION_P (decl))
8166 check_static_quals (decl, quals);
8170 cplus_decl_attributes (&decl, *attrlist, 0);
8171 *attrlist = NULL_TREE;
8174 /* Check main's type after attributes have been applied. */
8175 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
8177 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
8180 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
8182 error ("%<::main%> must return %<int%>");
8183 newtype = build_function_type (integer_type_node, oldtypeargs);
8184 TREE_TYPE (decl) = newtype;
8187 check_main_parameter_types (decl);
8190 if (ctype != NULL_TREE
8191 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
8194 tree old_decl = check_classfn (ctype, decl,
8195 (processing_template_decl
8196 > template_class_depth (ctype))
8197 ? current_template_parms
8200 if (old_decl == error_mark_node)
8208 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
8209 /* Because grokfndecl is always supposed to return a
8210 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8211 here. We depend on our callers to figure out that its
8212 really a template that's being returned. */
8213 old_decl = DECL_TEMPLATE_RESULT (old_decl);
8215 if (DECL_STATIC_FUNCTION_P (old_decl)
8216 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
8218 /* Remove the `this' parm added by grokclassfn. */
8219 revert_static_member_fn (decl);
8220 check_static_quals (decl, quals);
8222 if (DECL_ARTIFICIAL (old_decl))
8224 error ("definition of implicitly-declared %qD", old_decl);
8227 else if (DECL_DEFAULTED_FN (old_decl))
8229 error ("definition of explicitly-defaulted %q+D", decl);
8230 error ("%q+#D explicitly defaulted here", old_decl);
8234 /* Since we've smashed OLD_DECL to its
8235 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8236 if (TREE_CODE (decl) == TEMPLATE_DECL)
8237 decl = DECL_TEMPLATE_RESULT (decl);
8239 /* Attempt to merge the declarations. This can fail, in
8240 the case of some invalid specialization declarations. */
8241 pushed_scope = push_scope (ctype);
8242 ok = duplicate_decls (decl, old_decl, friendp);
8244 pop_scope (pushed_scope);
8247 error ("no %q#D member function declared in class %qT",
8251 if (ok == error_mark_node)
8257 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
8260 if (ctype == NULL_TREE || check)
8264 DECL_VIRTUAL_P (decl) = 1;
8269 /* decl is a FUNCTION_DECL.
8270 specifiers are the parsed virt-specifiers.
8272 Set flags to reflect the virt-specifiers.
8277 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
8279 if (decl == NULL_TREE)
8281 if (specifiers & VIRT_SPEC_OVERRIDE)
8282 DECL_OVERRIDE_P (decl) = 1;
8283 if (specifiers & VIRT_SPEC_FINAL)
8284 DECL_FINAL_P (decl) = 1;
8288 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8289 the linkage that DECL will receive in the object file. */
8292 set_linkage_for_static_data_member (tree decl)
8294 /* A static data member always has static storage duration and
8295 external linkage. Note that static data members are forbidden in
8296 local classes -- the only situation in which a class has
8297 non-external linkage. */
8298 TREE_PUBLIC (decl) = 1;
8299 TREE_STATIC (decl) = 1;
8300 /* For non-template classes, static data members are always put
8301 out in exactly those files where they are defined, just as
8302 with ordinary namespace-scope variables. */
8303 if (!processing_template_decl)
8304 DECL_INTERFACE_KNOWN (decl) = 1;
8307 /* Create a VAR_DECL named NAME with the indicated TYPE.
8309 If SCOPE is non-NULL, it is the class type or namespace containing
8310 the variable. If SCOPE is NULL, the variable should is created in
8311 the innermost enclosing scope. */
8314 grokvardecl (tree type,
8316 tree orig_declarator,
8317 const cp_decl_specifier_seq *declspecs,
8324 tree explicit_scope;
8326 gcc_assert (!name || identifier_p (name));
8328 bool constp = flags&1;
8329 bool conceptp = flags&2;
8331 /* Compute the scope in which to place the variable, but remember
8332 whether or not that scope was explicitly specified by the user. */
8333 explicit_scope = scope;
8336 /* An explicit "extern" specifier indicates a namespace-scope
8338 if (declspecs->storage_class == sc_extern)
8339 scope = current_decl_namespace ();
8340 else if (!at_function_scope_p ())
8341 scope = current_scope ();
8345 && (/* If the variable is a namespace-scope variable declared in a
8346 template, we need DECL_LANG_SPECIFIC. */
8347 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
8348 /* Similarly for namespace-scope variables with language linkage
8350 || (TREE_CODE (scope) == NAMESPACE_DECL
8351 && current_lang_name != lang_name_cplusplus)
8352 /* Similarly for static data members. */
8354 /* Similarly for explicit specializations. */
8356 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)))
8357 decl = build_lang_decl (VAR_DECL, name, type);
8359 decl = build_decl (input_location, VAR_DECL, name, type);
8361 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
8362 set_decl_namespace (decl, explicit_scope, 0);
8364 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
8366 if (declspecs->storage_class == sc_extern)
8368 DECL_THIS_EXTERN (decl) = 1;
8369 DECL_EXTERNAL (decl) = !initialized;
8372 if (DECL_CLASS_SCOPE_P (decl))
8374 set_linkage_for_static_data_member (decl);
8375 /* This function is only called with out-of-class definitions. */
8376 DECL_EXTERNAL (decl) = 0;
8377 check_class_member_definition_namespace (decl);
8379 /* At top level, either `static' or no s.c. makes a definition
8380 (perhaps tentative), and absence of `static' makes it public. */
8381 else if (toplevel_bindings_p ())
8383 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
8384 && (DECL_THIS_EXTERN (decl) || ! constp));
8385 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
8387 /* Not at top level, only `static' makes a static definition. */
8390 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
8391 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
8394 if (decl_spec_seq_has_spec_p (declspecs, ds_thread))
8396 if (DECL_EXTERNAL (decl) || TREE_STATIC (decl))
8398 CP_DECL_THREAD_LOCAL_P (decl) = true;
8399 if (!processing_template_decl)
8400 set_decl_tls_model (decl, decl_default_tls_model (decl));
8402 if (declspecs->gnu_thread_keyword_p)
8403 SET_DECL_GNU_TLS_P (decl);
8406 /* If the type of the decl has no linkage, make sure that we'll
8407 notice that in mark_used. */
8408 if (cxx_dialect > cxx98
8409 && decl_linkage (decl) != lk_none
8410 && DECL_LANG_SPECIFIC (decl) == NULL
8411 && !DECL_EXTERN_C_P (decl)
8412 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
8413 retrofit_lang_decl (decl);
8415 if (TREE_PUBLIC (decl))
8417 /* [basic.link]: A name with no linkage (notably, the name of a class
8418 or enumeration declared in a local scope) shall not be used to
8419 declare an entity with linkage.
8421 DR 757 relaxes this restriction for C++0x. */
8422 if (cxx_dialect < cxx11)
8423 no_linkage_error (decl);
8426 DECL_INTERFACE_KNOWN (decl) = 1;
8428 if (DECL_NAME (decl)
8429 && MAIN_NAME_P (DECL_NAME (decl))
8430 && scope == global_namespace)
8431 error ("cannot declare %<::main%> to be a global variable");
8433 /* Check that the variable can be safely declared as a concept.
8434 Note that this also forbids explicit specializations. */
8437 if (!processing_template_decl)
8439 error ("a non-template variable cannot be %<concept%>");
8443 DECL_DECLARED_CONCEPT_P (decl) = true;
8444 if (!same_type_ignoring_top_level_qualifiers_p (type, boolean_type_node))
8445 error_at (declspecs->locations[ds_type_spec],
8446 "concept must have type %<bool%>");
8448 else if (flag_concepts
8449 && processing_template_decl > template_class_depth (scope))
8451 tree reqs = TEMPLATE_PARMS_CONSTRAINTS (current_template_parms);
8452 tree ci = build_constraints (reqs, NULL_TREE);
8453 set_constraints (decl, ci);
8456 // Handle explicit specializations and instantiations of variable templates.
8457 if (orig_declarator)
8458 decl = check_explicit_specialization (orig_declarator, decl,
8459 template_count, conceptp * 8);
8461 return decl != error_mark_node ? decl : NULL_TREE;
8464 /* Create and return a canonical pointer to member function type, for
8465 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
8468 build_ptrmemfunc_type (tree type)
8473 if (type == error_mark_node)
8476 /* Make sure that we always have the unqualified pointer-to-member
8478 if (cp_cv_quals quals = cp_type_quals (type))
8480 tree unqual = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
8481 return cp_build_qualified_type (unqual, quals);
8484 /* If a canonical type already exists for this type, use it. We use
8485 this method instead of type_hash_canon, because it only does a
8486 simple equality check on the list of field members. */
8488 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
8491 t = make_node (RECORD_TYPE);
8493 /* Let the front end know this is a pointer to member function. */
8494 TYPE_PTRMEMFUNC_FLAG (t) = 1;
8496 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
8499 field = build_decl (input_location, FIELD_DECL, delta_identifier,
8501 DECL_CHAIN (field) = fields;
8504 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
8506 /* Zap out the name so that the back end will give us the debugging
8507 information for this anonymous RECORD_TYPE. */
8508 TYPE_NAME (t) = NULL_TREE;
8510 /* Cache this pointer-to-member type so that we can find it again
8512 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
8514 if (TYPE_STRUCTURAL_EQUALITY_P (type))
8515 SET_TYPE_STRUCTURAL_EQUALITY (t);
8516 else if (TYPE_CANONICAL (type) != type)
8517 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
8522 /* Create and return a pointer to data member type. */
8525 build_ptrmem_type (tree class_type, tree member_type)
8527 if (TREE_CODE (member_type) == METHOD_TYPE)
8529 cp_cv_quals quals = type_memfn_quals (member_type);
8530 cp_ref_qualifier rqual = type_memfn_rqual (member_type);
8531 member_type = build_memfn_type (member_type, class_type, quals, rqual);
8532 return build_ptrmemfunc_type (build_pointer_type (member_type));
8536 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
8537 return build_offset_type (class_type, member_type);
8541 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
8542 Check to see that the definition is valid. Issue appropriate error
8543 messages. Return 1 if the definition is particularly bad, or 0
8547 check_static_variable_definition (tree decl, tree type)
8549 /* Can't check yet if we don't know the type. */
8550 if (dependent_type_p (type))
8552 /* If DECL is declared constexpr, we'll do the appropriate checks
8553 in check_initializer. */
8554 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
8556 else if (cxx_dialect >= cxx11 && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
8558 if (!COMPLETE_TYPE_P (type))
8559 error ("in-class initialization of static data member %q#D of "
8560 "incomplete type", decl);
8561 else if (literal_type_p (type))
8562 permerror (input_location,
8563 "%<constexpr%> needed for in-class initialization of "
8564 "static data member %q#D of non-integral type", decl);
8566 error ("in-class initialization of static data member %q#D of "
8567 "non-literal type", decl);
8571 /* Motion 10 at San Diego: If a static const integral data member is
8572 initialized with an integral constant expression, the initializer
8573 may appear either in the declaration (within the class), or in
8574 the definition, but not both. If it appears in the class, the
8575 member is a member constant. The file-scope definition is always
8577 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
8579 error ("invalid in-class initialization of static data member "
8580 "of non-integral type %qT",
8584 else if (!CP_TYPE_CONST_P (type))
8585 error ("ISO C++ forbids in-class initialization of non-const "
8586 "static member %qD",
8588 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
8589 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids initialization of member constant "
8590 "%qD of non-integral type %qT", decl, type);
8595 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
8596 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
8597 expressions out into temporary variables so that walk_tree doesn't
8598 step into them (c++/15764). */
8601 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
8603 hash_set<tree> *pset = (hash_set<tree> *)data;
8604 tree expr = *expr_p;
8605 if (TREE_CODE (expr) == SAVE_EXPR)
8607 tree op = TREE_OPERAND (expr, 0);
8608 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
8609 if (TREE_SIDE_EFFECTS (op))
8610 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
8613 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
8618 /* Entry point for the above. */
8621 stabilize_vla_size (tree size)
8623 hash_set<tree> pset;
8624 /* Break out any function calls into temporary variables. */
8625 cp_walk_tree (&size, stabilize_save_expr_r, &pset, &pset);
8628 /* Reduce a SIZEOF_EXPR to its value. */
8631 fold_sizeof_expr (tree t)
8634 if (SIZEOF_EXPR_TYPE_P (t))
8635 r = cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t, 0)),
8636 SIZEOF_EXPR, false);
8637 else if (TYPE_P (TREE_OPERAND (t, 0)))
8638 r = cxx_sizeof_or_alignof_type (TREE_OPERAND (t, 0), SIZEOF_EXPR,
8641 r = cxx_sizeof_or_alignof_expr (TREE_OPERAND (t, 0), SIZEOF_EXPR,
8643 if (r == error_mark_node)
8648 /* Given the SIZE (i.e., number of elements) in an array, compute
8649 an appropriate index type for the array. If non-NULL, NAME is
8650 the name of the entity being declared. */
8653 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
8658 if (error_operand_p (size))
8659 return error_mark_node;
8661 if (!type_dependent_expression_p (size))
8663 tree type = TREE_TYPE (size);
8665 mark_rvalue_use (size);
8667 if (cxx_dialect < cxx11 && TREE_CODE (size) == NOP_EXPR
8668 && TREE_SIDE_EFFECTS (size))
8669 /* In C++98, we mark a non-constant array bound with a magic
8670 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
8673 size = instantiate_non_dependent_expr_sfinae (size, complain);
8675 if (CLASS_TYPE_P (type)
8676 && CLASSTYPE_LITERAL_P (type))
8678 size = build_expr_type_conversion (WANT_INT, size, true);
8681 if (!(complain & tf_error))
8682 return error_mark_node;
8684 error ("size of array %qD has non-integral type %qT",
8687 error ("size of array has non-integral type %qT", type);
8688 size = integer_one_node;
8690 if (size == error_mark_node)
8691 return error_mark_node;
8692 type = TREE_TYPE (size);
8695 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
8696 size = maybe_constant_value (size);
8698 if (!TREE_CONSTANT (size))
8702 if (error_operand_p (size))
8703 return error_mark_node;
8705 /* The array bound must be an integer type. */
8706 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
8708 if (!(complain & tf_error))
8709 return error_mark_node;
8711 error ("size of array %qD has non-integral type %qT", name, type);
8713 error ("size of array has non-integral type %qT", type);
8714 size = integer_one_node;
8715 type = TREE_TYPE (size);
8719 /* A type is dependent if it is...an array type constructed from any
8720 dependent type or whose size is specified by a constant expression
8721 that is value-dependent. */
8722 /* We can only call value_dependent_expression_p on integral constant
8723 expressions; treat non-constant expressions as dependent, too. */
8724 if (processing_template_decl
8725 && (type_dependent_expression_p (size)
8726 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
8728 /* We cannot do any checking for a SIZE that isn't known to be
8729 constant. Just build the index type and mark that it requires
8730 structural equality checks. */
8731 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
8732 size, size_one_node));
8733 TYPE_DEPENDENT_P (itype) = 1;
8734 TYPE_DEPENDENT_P_VALID (itype) = 1;
8735 SET_TYPE_STRUCTURAL_EQUALITY (itype);
8739 if (TREE_CODE (size) != INTEGER_CST)
8741 tree folded = cp_fully_fold (size);
8742 if (TREE_CODE (folded) == INTEGER_CST)
8743 pedwarn (location_of (size), OPT_Wpedantic,
8744 "size of array is not an integral constant-expression");
8745 /* Use the folded result for VLAs, too; it will have resolved
8750 /* Normally, the array-bound will be a constant. */
8751 if (TREE_CODE (size) == INTEGER_CST)
8753 /* Check to see if the array bound overflowed. Make that an
8754 error, no matter how generous we're being. */
8755 constant_expression_error (size);
8757 /* An array must have a positive number of elements. */
8758 if (tree_int_cst_lt (size, integer_zero_node))
8760 if (!(complain & tf_error))
8761 return error_mark_node;
8763 error ("size of array %qD is negative", name);
8765 error ("size of array is negative");
8766 size = integer_one_node;
8768 /* As an extension we allow zero-sized arrays. */
8769 else if (integer_zerop (size))
8771 if (!(complain & tf_error))
8772 /* We must fail if performing argument deduction (as
8773 indicated by the state of complain), so that
8774 another substitution can be found. */
8775 return error_mark_node;
8776 else if (in_system_header_at (input_location))
8777 /* Allow them in system headers because glibc uses them. */;
8779 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array %qD", name);
8781 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array");
8784 else if (TREE_CONSTANT (size)
8785 /* We don't allow VLAs at non-function scopes, or during
8786 tentative template substitution. */
8787 || !at_function_scope_p ()
8788 || !(complain & tf_error))
8790 if (!(complain & tf_error))
8791 return error_mark_node;
8792 /* `(int) &fn' is not a valid array bound. */
8794 error ("size of array %qD is not an integral constant-expression",
8797 error ("size of array is not an integral constant-expression");
8798 size = integer_one_node;
8800 else if (pedantic && warn_vla != 0)
8803 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8805 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8807 else if (warn_vla > 0)
8811 "variable length array %qD is used", name);
8814 "variable length array is used");
8817 if (processing_template_decl && !TREE_CONSTANT (size))
8818 /* A variable sized array. */
8819 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8822 HOST_WIDE_INT saved_processing_template_decl;
8824 /* Compute the index of the largest element in the array. It is
8825 one less than the number of elements in the array. We save
8826 and restore PROCESSING_TEMPLATE_DECL so that computations in
8827 cp_build_binary_op will be appropriately folded. */
8828 saved_processing_template_decl = processing_template_decl;
8829 processing_template_decl = 0;
8830 itype = cp_build_binary_op (input_location,
8832 cp_convert (ssizetype, size, complain),
8833 cp_convert (ssizetype, integer_one_node,
8836 itype = maybe_constant_value (itype);
8837 processing_template_decl = saved_processing_template_decl;
8839 if (!TREE_CONSTANT (itype))
8841 /* A variable sized array. */
8842 itype = variable_size (itype);
8844 stabilize_vla_size (itype);
8846 if (flag_sanitize & SANITIZE_VLA
8847 && do_ubsan_in_current_function ())
8849 /* We have to add 1 -- in the ubsan routine we generate
8850 LE_EXPR rather than LT_EXPR. */
8851 tree t = fold_build2 (PLUS_EXPR, TREE_TYPE (itype), itype,
8852 build_one_cst (TREE_TYPE (itype)));
8853 t = ubsan_instrument_vla (input_location, t);
8854 finish_expr_stmt (t);
8857 /* Make sure that there was no overflow when creating to a signed
8858 index type. (For example, on a 32-bit machine, an array with
8859 size 2^32 - 1 is too big.) */
8860 else if (TREE_CODE (itype) == INTEGER_CST
8861 && TREE_OVERFLOW (itype))
8863 if (!(complain & tf_error))
8864 return error_mark_node;
8865 error ("overflow in array dimension");
8866 TREE_OVERFLOW (itype) = 0;
8870 /* Create and return the appropriate index type. */
8871 itype = build_index_type (itype);
8873 /* If the index type were dependent, we would have returned early, so
8874 remember that it isn't. */
8875 TYPE_DEPENDENT_P (itype) = 0;
8876 TYPE_DEPENDENT_P_VALID (itype) = 1;
8880 /* Returns the scope (if any) in which the entity declared by
8881 DECLARATOR will be located. If the entity was declared with an
8882 unqualified name, NULL_TREE is returned. */
8885 get_scope_of_declarator (const cp_declarator *declarator)
8887 while (declarator && declarator->kind != cdk_id)
8888 declarator = declarator->declarator;
8890 /* If the declarator-id is a SCOPE_REF, the scope in which the
8891 declaration occurs is the first operand. */
8893 && declarator->u.id.qualifying_scope)
8894 return declarator->u.id.qualifying_scope;
8896 /* Otherwise, the declarator is not a qualified name; the entity will
8897 be declared in the current scope. */
8901 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8902 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8906 create_array_type_for_decl (tree name, tree type, tree size)
8908 tree itype = NULL_TREE;
8910 /* If things have already gone awry, bail now. */
8911 if (type == error_mark_node || size == error_mark_node)
8912 return error_mark_node;
8914 /* 8.3.4/1: If the type of the identifier of D contains the auto
8915 type-specifier, the program is ill-formed. */
8916 if (type_uses_auto (type))
8918 error ("%qD declared as array of %qT", name, type);
8919 return error_mark_node;
8922 /* If there are some types which cannot be array elements,
8923 issue an error-message and return. */
8924 switch (TREE_CODE (type))
8928 error ("declaration of %qD as array of void", name);
8930 error ("creating array of void");
8931 return error_mark_node;
8935 error ("declaration of %qD as array of functions", name);
8937 error ("creating array of functions");
8938 return error_mark_node;
8940 case REFERENCE_TYPE:
8942 error ("declaration of %qD as array of references", name);
8944 error ("creating array of references");
8945 return error_mark_node;
8949 error ("declaration of %qD as array of function members", name);
8951 error ("creating array of function members");
8952 return error_mark_node;
8960 The constant expressions that specify the bounds of the arrays
8961 can be omitted only for the first member of the sequence. */
8962 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8965 error ("declaration of %qD as multidimensional array must "
8966 "have bounds for all dimensions except the first",
8969 error ("multidimensional array must have bounds for all "
8970 "dimensions except the first");
8972 return error_mark_node;
8975 /* Figure out the index type for the array. */
8977 itype = compute_array_index_type (name, size, tf_warning_or_error);
8980 T is called the array element type; this type shall not be [...] an
8981 abstract class type. */
8982 abstract_virtuals_error (name, type);
8984 return build_cplus_array_type (type, itype);
8987 /* Returns the smallest location != UNKNOWN_LOCATION among the
8988 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
8989 and LOCATIONS[ds_restrict]. */
8992 smallest_type_quals_location (int type_quals, const location_t* locations)
8994 location_t loc = UNKNOWN_LOCATION;
8996 if (type_quals & TYPE_QUAL_CONST)
8997 loc = locations[ds_const];
8999 if ((type_quals & TYPE_QUAL_VOLATILE)
9000 && (loc == UNKNOWN_LOCATION || locations[ds_volatile] < loc))
9001 loc = locations[ds_volatile];
9003 if ((type_quals & TYPE_QUAL_RESTRICT)
9004 && (loc == UNKNOWN_LOCATION || locations[ds_restrict] < loc))
9005 loc = locations[ds_restrict];
9010 /* Check that it's OK to declare a function with the indicated TYPE
9011 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9012 that this function is. OPTYPE is the type given in a conversion
9013 operator declaration, or the class type for a constructor/destructor.
9014 Returns the actual return type of the function; that may be different
9015 than TYPE if an error occurs, or for certain special functions. */
9018 check_special_function_return_type (special_function_kind sfk,
9022 const location_t* locations)
9026 case sfk_constructor:
9028 error ("return type specification for constructor invalid");
9029 else if (type_quals != TYPE_UNQUALIFIED)
9030 error_at (smallest_type_quals_location (type_quals, locations),
9031 "qualifiers are not allowed on constructor declaration");
9033 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
9034 type = build_pointer_type (optype);
9036 type = void_type_node;
9039 case sfk_destructor:
9041 error ("return type specification for destructor invalid");
9042 else if (type_quals != TYPE_UNQUALIFIED)
9043 error_at (smallest_type_quals_location (type_quals, locations),
9044 "qualifiers are not allowed on destructor declaration");
9046 /* We can't use the proper return type here because we run into
9047 problems with ambiguous bases and covariant returns.
9048 Java classes are left unchanged because (void *) isn't a valid
9049 Java type, and we don't want to change the Java ABI. */
9050 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
9051 type = build_pointer_type (void_type_node);
9053 type = void_type_node;
9056 case sfk_conversion:
9058 error ("return type specified for %<operator %T%>", optype);
9059 else if (type_quals != TYPE_UNQUALIFIED)
9060 error_at (smallest_type_quals_location (type_quals, locations),
9061 "qualifiers are not allowed on declaration of "
9062 "%<operator %T%>", optype);
9074 /* A variable or data member (whose unqualified name is IDENTIFIER)
9075 has been declared with the indicated TYPE. If the TYPE is not
9076 acceptable, issue an error message and return a type to use for
9077 error-recovery purposes. */
9080 check_var_type (tree identifier, tree type)
9082 if (VOID_TYPE_P (type))
9085 error ("unnamed variable or field declared void");
9086 else if (identifier_p (identifier))
9088 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
9089 error ("variable or field %qE declared void", identifier);
9092 error ("variable or field declared void");
9093 type = error_mark_node;
9099 /* Given declspecs and a declarator (abstract or otherwise), determine
9100 the name and type of the object declared and construct a DECL node
9103 DECLSPECS points to the representation of declaration-specifier
9104 sequence that precedes declarator.
9106 DECL_CONTEXT says which syntactic context this declaration is in:
9107 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9108 FUNCDEF for a function definition. Like NORMAL but a few different
9109 error messages in each case. Return value may be zero meaning
9110 this definition is too screwy to try to parse.
9111 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9112 handle member functions (which have FIELD context).
9113 Return value may be zero meaning this definition is too screwy to
9115 PARM for a parameter declaration (either within a function prototype
9116 or before a function body). Make a PARM_DECL, or return void_type_node.
9117 TPARM for a template parameter declaration.
9118 CATCHPARM for a parameter declaration before a catch clause.
9119 TYPENAME if for a typename (in a cast or sizeof).
9120 Don't make a DECL node; just return the ..._TYPE node.
9121 FIELD for a struct or union field; make a FIELD_DECL.
9122 BITFIELD for a field with specified width.
9124 INITIALIZED is as for start_decl.
9126 ATTRLIST is a pointer to the list of attributes, which may be NULL
9127 if there are none; *ATTRLIST may be modified if attributes from inside
9128 the declarator should be applied to the declaration.
9130 When this function is called, scoping variables (such as
9131 CURRENT_CLASS_TYPE) should reflect the scope in which the
9132 declaration occurs, not the scope in which the new declaration will
9133 be placed. For example, on:
9137 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9140 Returns a DECL (if a declarator is present), a TYPE (if there is no
9141 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9145 grokdeclarator (const cp_declarator *declarator,
9146 cp_decl_specifier_seq *declspecs,
9147 enum decl_context decl_context,
9151 tree type = NULL_TREE;
9153 int explicit_intN = 0;
9154 int virtualp, explicitp, friendp, inlinep, staticp;
9155 int explicit_int = 0;
9156 int explicit_char = 0;
9157 int defaulted_int = 0;
9159 tree typedef_decl = NULL_TREE;
9160 const char *name = NULL;
9161 tree typedef_type = NULL_TREE;
9162 /* True if this declarator is a function definition. */
9163 bool funcdef_flag = false;
9164 cp_declarator_kind innermost_code = cdk_error;
9167 /* See the code below that used this. */
9168 tree decl_attr = NULL_TREE;
9171 /* Keep track of what sort of function is being processed
9172 so that we can warn about default return values, or explicit
9173 return values which do not match prescribed defaults. */
9174 special_function_kind sfk = sfk_none;
9176 tree dname = NULL_TREE;
9177 tree ctor_return_type = NULL_TREE;
9178 enum overload_flags flags = NO_SPECIAL;
9179 /* cv-qualifiers that apply to the declarator, for a declaration of
9180 a member function. */
9181 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
9182 /* virt-specifiers that apply to the declarator, for a declaration of
9183 a member function. */
9184 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
9185 /* ref-qualifier that applies to the declarator, for a declaration of
9186 a member function. */
9187 cp_ref_qualifier rqual = REF_QUAL_NONE;
9188 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
9189 int type_quals = TYPE_UNQUALIFIED;
9190 tree raises = NULL_TREE;
9191 int template_count = 0;
9192 tree returned_attrs = NULL_TREE;
9193 tree parms = NULL_TREE;
9194 const cp_declarator *id_declarator;
9195 /* The unqualified name of the declarator; either an
9196 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
9197 tree unqualified_id;
9198 /* The class type, if any, in which this entity is located,
9199 or NULL_TREE if none. Note that this value may be different from
9200 the current class type; for example if an attempt is made to declare
9201 "A::f" inside "B", this value will be "A". */
9202 tree ctype = current_class_type;
9203 /* The NAMESPACE_DECL for the namespace in which this entity is
9204 located. If an unqualified name is used to declare the entity,
9205 this value will be NULL_TREE, even if the entity is located at
9207 tree in_namespace = NULL_TREE;
9208 cp_storage_class storage_class;
9209 bool unsigned_p, signed_p, short_p, long_p, thread_p;
9210 bool type_was_error_mark_node = false;
9211 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
9212 bool template_type_arg = false;
9213 bool template_parm_flag = false;
9214 bool typedef_p = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
9215 bool constexpr_p = decl_spec_seq_has_spec_p (declspecs, ds_constexpr);
9216 bool late_return_type_p = false;
9217 bool array_parameter_p = false;
9218 source_location saved_loc = input_location;
9220 tree reqs = NULL_TREE;
9222 signed_p = decl_spec_seq_has_spec_p (declspecs, ds_signed);
9223 unsigned_p = decl_spec_seq_has_spec_p (declspecs, ds_unsigned);
9224 short_p = decl_spec_seq_has_spec_p (declspecs, ds_short);
9225 long_p = decl_spec_seq_has_spec_p (declspecs, ds_long);
9226 longlong = decl_spec_seq_has_spec_p (declspecs, ds_long_long);
9227 explicit_intN = declspecs->explicit_intN_p;
9228 thread_p = decl_spec_seq_has_spec_p (declspecs, ds_thread);
9230 // Was concept_p specified? Note that ds_concept
9231 // implies ds_constexpr!
9232 bool concept_p = decl_spec_seq_has_spec_p (declspecs, ds_concept);
9236 if (decl_spec_seq_has_spec_p (declspecs, ds_const))
9237 type_quals |= TYPE_QUAL_CONST;
9238 if (decl_spec_seq_has_spec_p (declspecs, ds_volatile))
9239 type_quals |= TYPE_QUAL_VOLATILE;
9240 if (decl_spec_seq_has_spec_p (declspecs, ds_restrict))
9241 type_quals |= TYPE_QUAL_RESTRICT;
9243 if (decl_context == FUNCDEF)
9244 funcdef_flag = true, decl_context = NORMAL;
9245 else if (decl_context == MEMFUNCDEF)
9246 funcdef_flag = true, decl_context = FIELD;
9247 else if (decl_context == BITFIELD)
9248 bitfield = 1, decl_context = FIELD;
9249 else if (decl_context == TEMPLATE_TYPE_ARG)
9250 template_type_arg = true, decl_context = TYPENAME;
9251 else if (decl_context == TPARM)
9252 template_parm_flag = true, decl_context = PARM;
9254 if (initialized > 1)
9255 funcdef_flag = true;
9257 /* Look inside a declarator for the name being declared
9258 and get it as a string, for an error message. */
9259 for (id_declarator = declarator;
9261 id_declarator = id_declarator->declarator)
9263 if (id_declarator->kind != cdk_id)
9264 innermost_code = id_declarator->kind;
9266 switch (id_declarator->kind)
9269 if (id_declarator->declarator
9270 && id_declarator->declarator->kind == cdk_id)
9272 sfk = id_declarator->declarator->u.id.sfk;
9273 if (sfk == sfk_destructor)
9280 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
9281 tree decl = id_declarator->u.id.unqualified_name;
9284 if (qualifying_scope)
9286 if (at_function_scope_p ())
9290 A declarator-id shall not be qualified except
9293 None of the cases are permitted in block
9295 if (qualifying_scope == global_namespace)
9296 error ("invalid use of qualified-name %<::%D%>",
9298 else if (TYPE_P (qualifying_scope))
9299 error ("invalid use of qualified-name %<%T::%D%>",
9300 qualifying_scope, decl);
9302 error ("invalid use of qualified-name %<%D::%D%>",
9303 qualifying_scope, decl);
9304 return error_mark_node;
9306 else if (TYPE_P (qualifying_scope))
9308 ctype = qualifying_scope;
9309 if (!MAYBE_CLASS_TYPE_P (ctype))
9311 error ("%q#T is not a class or a namespace", ctype);
9314 else if (innermost_code != cdk_function
9315 && current_class_type
9316 && !uniquely_derived_from_p (ctype,
9317 current_class_type))
9319 error ("invalid use of qualified-name %<%T::%D%>",
9320 qualifying_scope, decl);
9321 return error_mark_node;
9324 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
9325 in_namespace = qualifying_scope;
9327 switch (TREE_CODE (decl))
9333 if (innermost_code != cdk_function)
9335 error ("declaration of %qD as non-function", decl);
9336 return error_mark_node;
9338 else if (!qualifying_scope
9339 && !(current_class_type && at_class_scope_p ()))
9341 error ("declaration of %qD as non-member", decl);
9342 return error_mark_node;
9345 type = TREE_OPERAND (decl, 0);
9347 type = constructor_name (type);
9348 name = identifier_to_locale (IDENTIFIER_POINTER (type));
9353 case TEMPLATE_ID_EXPR:
9355 tree fns = TREE_OPERAND (decl, 0);
9358 if (!identifier_p (dname))
9360 if (variable_template_p (dname))
9361 dname = DECL_NAME (dname);
9364 gcc_assert (is_overloaded_fn (dname));
9365 dname = DECL_NAME (get_first_fn (dname));
9371 case IDENTIFIER_NODE:
9372 if (identifier_p (decl))
9375 if (C_IS_RESERVED_WORD (dname))
9377 error ("declarator-id missing; using reserved word %qD",
9379 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9381 else if (!IDENTIFIER_TYPENAME_P (dname))
9382 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9385 gcc_assert (flags == NO_SPECIAL);
9386 flags = TYPENAME_FLAG;
9387 ctor_return_type = TREE_TYPE (dname);
9388 sfk = sfk_conversion;
9389 if (is_typename_at_global_scope (dname))
9390 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9392 name = "<invalid operator>";
9409 return error_mark_node;
9414 if (id_declarator->kind == cdk_id)
9420 The declarator in a function-definition shall have the form
9421 D1 ( parameter-declaration-clause) ... */
9422 if (funcdef_flag && innermost_code != cdk_function)
9424 error ("function definition does not declare parameters");
9425 return error_mark_node;
9428 if (flags == TYPENAME_FLAG
9429 && innermost_code != cdk_function
9430 && ! (ctype && !declspecs->any_specifiers_p))
9432 error ("declaration of %qD as non-function", dname);
9433 return error_mark_node;
9437 && identifier_p (dname)
9438 && UDLIT_OPER_P (dname)
9439 && innermost_code != cdk_function)
9441 error ("declaration of %qD as non-function", dname);
9442 return error_mark_node;
9445 if (dname && IDENTIFIER_OPNAME_P (dname))
9449 error ("declaration of %qD as %<typedef%>", dname);
9450 return error_mark_node;
9452 else if (decl_context == PARM || decl_context == CATCHPARM)
9454 error ("declaration of %qD as parameter", dname);
9455 return error_mark_node;
9459 /* Anything declared one level down from the top level
9460 must be one of the parameters of a function
9461 (because the body is at least two levels down). */
9463 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
9464 by not allowing C++ class definitions to specify their parameters
9465 with xdecls (must be spec.d in the parmlist).
9467 Since we now wait to push a class scope until we are sure that
9468 we are in a legitimate method context, we must set oldcname
9469 explicitly (since current_class_name is not yet alive).
9471 We also want to avoid calling this a PARM if it is in a namespace. */
9473 if (decl_context == NORMAL && !toplevel_bindings_p ())
9475 cp_binding_level *b = current_binding_level;
9476 current_binding_level = b->level_chain;
9477 if (current_binding_level != 0 && toplevel_bindings_p ())
9478 decl_context = PARM;
9479 current_binding_level = b;
9483 name = decl_context == PARM ? "parameter" : "type name";
9485 if (concept_p && typedef_p)
9487 error ("%<concept%> cannot appear in a typedef declaration");
9488 return error_mark_node;
9491 if (constexpr_p && typedef_p)
9493 error ("%<constexpr%> cannot appear in a typedef declaration");
9494 return error_mark_node;
9497 /* If there were multiple types specified in the decl-specifier-seq,
9498 issue an error message. */
9499 if (declspecs->multiple_types_p)
9501 error ("two or more data types in declaration of %qs", name);
9502 return error_mark_node;
9505 if (declspecs->conflicting_specifiers_p)
9507 error ("conflicting specifiers in declaration of %qs", name);
9508 return error_mark_node;
9511 /* Extract the basic type from the decl-specifier-seq. */
9512 type = declspecs->type;
9513 if (type == error_mark_node)
9516 type_was_error_mark_node = true;
9518 /* If the entire declaration is itself tagged as deprecated then
9519 suppress reports of deprecated items. */
9520 if (type && TREE_DEPRECATED (type)
9521 && deprecated_state != DEPRECATED_SUPPRESS)
9522 warn_deprecated_use (type, NULL_TREE);
9523 if (type && TREE_CODE (type) == TYPE_DECL)
9525 typedef_decl = type;
9526 type = TREE_TYPE (typedef_decl);
9527 if (TREE_DEPRECATED (type)
9528 && DECL_ARTIFICIAL (typedef_decl)
9529 && deprecated_state != DEPRECATED_SUPPRESS)
9530 warn_deprecated_use (type, NULL_TREE);
9532 /* No type at all: default to `int', and set DEFAULTED_INT
9533 because it was not a user-defined typedef. */
9534 if (type == NULL_TREE)
9536 if (signed_p || unsigned_p || long_p || short_p)
9538 /* These imply 'int'. */
9539 type = integer_type_node;
9542 /* If we just have "complex", it is equivalent to "complex double". */
9543 else if (!longlong && !explicit_intN
9544 && decl_spec_seq_has_spec_p (declspecs, ds_complex))
9546 type = double_type_node;
9547 pedwarn (declspecs->locations[ds_complex], OPT_Wpedantic,
9548 "ISO C++ does not support plain %<complex%> meaning "
9549 "%<double complex%>");
9553 explicit_int = declspecs->explicit_int_p;
9554 explicit_char = declspecs->explicit_char_p;
9557 /* See the code below that used this. */
9559 decl_attr = DECL_ATTRIBUTES (typedef_decl);
9561 typedef_type = type;
9564 if (sfk != sfk_conversion)
9565 ctor_return_type = ctype;
9567 if (sfk != sfk_none)
9569 type = check_special_function_return_type (sfk, type,
9572 declspecs->locations);
9573 type_quals = TYPE_UNQUALIFIED;
9575 else if (type == NULL_TREE)
9581 /* We handle `main' specially here, because 'main () { }' is so
9582 common. With no options, it is allowed. With -Wreturn-type,
9583 it is a warning. It is only an error with -pedantic-errors. */
9584 is_main = (funcdef_flag
9585 && dname && identifier_p (dname)
9586 && MAIN_NAME_P (dname)
9587 && ctype == NULL_TREE
9588 && in_namespace == NULL_TREE
9589 && current_namespace == global_namespace);
9591 if (type_was_error_mark_node)
9592 /* We've already issued an error, don't complain more. */;
9593 else if (in_system_header_at (input_location) || flag_ms_extensions)
9594 /* Allow it, sigh. */;
9596 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
9598 pedwarn (input_location, OPT_Wpedantic,
9599 "ISO C++ forbids declaration of %qs with no type", name);
9601 warning (OPT_Wreturn_type,
9602 "ISO C++ forbids declaration of %qs with no type", name);
9604 if (type_was_error_mark_node && template_parm_flag)
9605 /* FIXME we should be able to propagate the error_mark_node as is
9606 for other contexts too. */
9607 type = error_mark_node;
9609 type = integer_type_node;
9616 if (! int_n_enabled_p[declspecs->int_n_idx])
9618 error ("%<__int%d%> is not supported by this target",
9619 int_n_data[declspecs->int_n_idx].bitsize);
9620 explicit_intN = false;
9622 else if (pedantic && ! in_system_header_at (input_location))
9623 pedwarn (input_location, OPT_Wpedantic,
9624 "ISO C++ does not support %<__int%d%> for %qs",
9625 int_n_data[declspecs->int_n_idx].bitsize, name);
9628 /* Now process the modifiers that were specified
9629 and check for invalid combinations. */
9631 /* Long double is a special combination. */
9632 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
9635 type = cp_build_qualified_type (long_double_type_node,
9636 cp_type_quals (type));
9639 /* Check all other uses of type modifiers. */
9641 if (unsigned_p || signed_p || long_p || short_p)
9645 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
9646 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
9647 else if (signed_p && unsigned_p)
9648 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
9649 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
9650 error ("%<long long%> invalid for %qs", name);
9651 else if (long_p && TREE_CODE (type) == REAL_TYPE)
9652 error ("%<long%> invalid for %qs", name);
9653 else if (short_p && TREE_CODE (type) == REAL_TYPE)
9654 error ("%<short%> invalid for %qs", name);
9655 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
9656 error ("%<long%> or %<short%> invalid for %qs", name);
9657 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_intN)
9658 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
9659 else if ((long_p || short_p) && explicit_char)
9660 error ("%<long%> or %<short%> specified with char for %qs", name);
9661 else if (long_p && short_p)
9662 error ("%<long%> and %<short%> specified together for %qs", name);
9663 else if (type == char16_type_node || type == char32_type_node)
9665 if (signed_p || unsigned_p)
9666 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
9667 else if (short_p || long_p)
9668 error ("%<short%> or %<long%> invalid for %qs", name);
9673 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_intN && pedantic)
9675 pedwarn (input_location, OPT_Wpedantic,
9676 "long, short, signed or unsigned used invalidly for %qs",
9678 if (flag_pedantic_errors)
9683 /* Discard the type modifiers if they are invalid. */
9694 /* Decide whether an integer type is signed or not.
9695 Optionally treat bitfields as signed by default. */
9699 It is implementation-defined whether a plain (neither
9700 explicitly signed or unsigned) char, short, int, or long
9701 bit-field is signed or unsigned.
9703 Naturally, we extend this to long long as well. Note that
9704 this does not include wchar_t. */
9705 || (bitfield && !flag_signed_bitfields
9707 /* A typedef for plain `int' without `signed' can be
9708 controlled just like plain `int', but a typedef for
9709 `signed int' cannot be so controlled. */
9711 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
9712 && TREE_CODE (type) == INTEGER_TYPE
9713 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
9716 type = int_n_trees[declspecs->int_n_idx].unsigned_type;
9718 type = long_long_unsigned_type_node;
9720 type = long_unsigned_type_node;
9722 type = short_unsigned_type_node;
9723 else if (type == char_type_node)
9724 type = unsigned_char_type_node;
9725 else if (typedef_decl)
9726 type = unsigned_type_for (type);
9728 type = unsigned_type_node;
9730 else if (signed_p && type == char_type_node)
9731 type = signed_char_type_node;
9732 else if (explicit_intN)
9733 type = int_n_trees[declspecs->int_n_idx].signed_type;
9735 type = long_long_integer_type_node;
9737 type = long_integer_type_node;
9739 type = short_integer_type_node;
9741 if (decl_spec_seq_has_spec_p (declspecs, ds_complex))
9743 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
9744 error ("complex invalid for %qs", name);
9745 /* If a modifier is specified, the resulting complex is the complex
9746 form of TYPE. E.g, "complex short" is "complex short int". */
9747 else if (type == integer_type_node)
9748 type = complex_integer_type_node;
9749 else if (type == float_type_node)
9750 type = complex_float_type_node;
9751 else if (type == double_type_node)
9752 type = complex_double_type_node;
9753 else if (type == long_double_type_node)
9754 type = complex_long_double_type_node;
9756 type = build_complex_type (type);
9759 /* If we're using the injected-class-name to form a compound type or a
9760 declaration, replace it with the underlying class so we don't get
9761 redundant typedefs in the debug output. But if we are returning the
9762 type unchanged, leave it alone so that it's available to
9763 maybe_get_template_decl_from_type_decl. */
9764 if (CLASS_TYPE_P (type)
9765 && DECL_SELF_REFERENCE_P (TYPE_NAME (type))
9766 && type == TREE_TYPE (TYPE_NAME (type))
9767 && (declarator || type_quals))
9768 type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));
9770 type_quals |= cp_type_quals (type);
9771 type = cp_build_qualified_type_real
9772 (type, type_quals, ((((typedef_decl && !DECL_ARTIFICIAL (typedef_decl))
9773 || declspecs->decltype_p)
9774 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
9775 /* We might have ignored or rejected some of the qualifiers. */
9776 type_quals = cp_type_quals (type);
9779 inlinep = decl_spec_seq_has_spec_p (declspecs, ds_inline);
9780 virtualp = decl_spec_seq_has_spec_p (declspecs, ds_virtual);
9781 explicitp = decl_spec_seq_has_spec_p (declspecs, ds_explicit);
9783 storage_class = declspecs->storage_class;
9784 if (storage_class == sc_static)
9785 staticp = 1 + (decl_context == FIELD);
9791 error ("member %qD cannot be declared both %<virtual%> "
9792 "and %<static%>", dname);
9793 storage_class = sc_none;
9797 error ("member %qD cannot be declared both %<virtual%> "
9798 "and %<constexpr%>", dname);
9800 friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend);
9802 /* Issue errors about use of storage classes for parameters. */
9803 if (decl_context == PARM)
9807 error ("typedef declaration invalid in parameter declaration");
9808 return error_mark_node;
9810 else if (template_parm_flag && storage_class != sc_none)
9812 error ("storage class specified for template parameter %qs", name);
9813 return error_mark_node;
9815 else if (storage_class == sc_static
9816 || storage_class == sc_extern
9818 error ("storage class specifiers invalid in parameter declarations");
9820 /* Function parameters cannot be concept. */
9822 error ("a parameter cannot be declared %<concept%>");
9823 /* Function parameters cannot be constexpr. If we saw one, moan
9824 and pretend it wasn't there. */
9825 else if (constexpr_p)
9827 error ("a parameter cannot be declared %<constexpr%>");
9832 /* Give error if `virtual' is used outside of class declaration. */
9834 && (current_class_name == NULL_TREE || decl_context != FIELD))
9836 error_at (declspecs->locations[ds_virtual],
9837 "%<virtual%> outside class declaration");
9841 /* Static anonymous unions are dealt with here. */
9842 if (staticp && decl_context == TYPENAME
9844 && ANON_AGGR_TYPE_P (declspecs->type))
9845 decl_context = FIELD;
9847 /* Warn about storage classes that are invalid for certain
9848 kinds of declarations (parameters, typenames, etc.). */
9851 && storage_class != sc_extern
9852 && storage_class != sc_static)
9855 error ("multiple storage classes in declaration of %qs", name);
9858 if (decl_context != NORMAL
9859 && ((storage_class != sc_none
9860 && storage_class != sc_mutable)
9863 if ((decl_context == PARM || decl_context == CATCHPARM)
9864 && (storage_class == sc_register
9865 || storage_class == sc_auto))
9869 else if (decl_context == FIELD
9870 /* C++ allows static class elements. */
9871 && storage_class == sc_static)
9872 /* C++ also allows inlines and signed and unsigned elements,
9873 but in those cases we don't come in here. */
9877 if (decl_context == FIELD)
9878 error ("storage class specified for %qs", name);
9881 if (decl_context == PARM || decl_context == CATCHPARM)
9882 error ("storage class specified for parameter %qs", name);
9884 error ("storage class specified for typename");
9886 if (storage_class == sc_register
9887 || storage_class == sc_auto
9888 || storage_class == sc_extern
9890 storage_class = sc_none;
9893 else if (storage_class == sc_extern && funcdef_flag
9894 && ! toplevel_bindings_p ())
9895 error ("nested function %qs declared %<extern%>", name);
9896 else if (toplevel_bindings_p ())
9898 if (storage_class == sc_auto)
9899 error ("top-level declaration of %qs specifies %<auto%>", name);
9902 && storage_class != sc_extern
9903 && storage_class != sc_static)
9905 if (declspecs->gnu_thread_keyword_p)
9906 pedwarn (input_location, 0, "function-scope %qs implicitly auto and "
9907 "declared %<__thread%>", name);
9909 /* When thread_local is applied to a variable of block scope the
9910 storage-class-specifier static is implied if it does not appear
9912 storage_class = declspecs->storage_class = sc_static;
9916 if (storage_class && friendp)
9918 error ("storage class specifiers invalid in friend function declarations");
9919 storage_class = sc_none;
9924 unqualified_id = NULL_TREE;
9927 unqualified_id = id_declarator->u.id.unqualified_name;
9928 switch (TREE_CODE (unqualified_id))
9931 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9932 if (TYPE_P (unqualified_id))
9933 unqualified_id = constructor_name (unqualified_id);
9936 case IDENTIFIER_NODE:
9937 case TEMPLATE_ID_EXPR:
9945 if (declspecs->std_attributes)
9947 /* Apply the c++11 attributes to the type preceding them. */
9948 input_location = declspecs->locations[ds_std_attribute];
9949 decl_attributes (&type, declspecs->std_attributes, 0);
9950 input_location = saved_loc;
9953 /* Determine the type of the entity declared by recurring on the
9955 for (; declarator; declarator = declarator->declarator)
9957 const cp_declarator *inner_declarator;
9960 if (type == error_mark_node)
9961 return error_mark_node;
9963 attrs = declarator->attributes;
9969 if (declarator == NULL || declarator->kind == cdk_id)
9970 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9971 if (declarator->kind == cdk_function)
9972 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9973 if (declarator->kind == cdk_array)
9974 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9975 returned_attrs = decl_attributes (&type,
9976 chainon (returned_attrs, attrs),
9980 if (declarator->kind == cdk_id)
9983 inner_declarator = declarator->declarator;
9985 switch (declarator->kind)
9988 type = create_array_type_for_decl (dname, type,
9989 declarator->u.array.bounds);
9990 if (!valid_array_size_p (input_location, type, dname))
9991 type = error_mark_node;
9993 if (declarator->std_attributes)
9996 The optional attribute-specifier-seq appertains to the
9998 returned_attrs = chainon (returned_attrs,
9999 declarator->std_attributes);
10007 /* Declaring a function type.
10008 Make sure we have a valid type for the function to return. */
10010 if (type_quals != TYPE_UNQUALIFIED)
10012 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
10013 warning (OPT_Wignored_qualifiers,
10014 "type qualifiers ignored on function return type");
10015 /* We now know that the TYPE_QUALS don't apply to the
10016 decl, but to its return type. */
10017 type_quals = TYPE_UNQUALIFIED;
10019 errmsg = targetm.invalid_return_type (type);
10023 type = integer_type_node;
10026 /* Error about some types functions can't return. */
10028 if (TREE_CODE (type) == FUNCTION_TYPE)
10030 error ("%qs declared as function returning a function", name);
10031 return error_mark_node;
10033 if (TREE_CODE (type) == ARRAY_TYPE)
10035 error ("%qs declared as function returning an array", name);
10036 return error_mark_node;
10039 input_location = declspecs->locations[ds_type_spec];
10040 abstract_virtuals_error (ACU_RETURN, type);
10041 input_location = saved_loc;
10043 /* Pick up type qualifiers which should be applied to `this'. */
10044 memfn_quals = declarator->u.function.qualifiers;
10045 /* Pick up virt-specifiers. */
10046 virt_specifiers = declarator->u.function.virt_specifiers;
10047 /* And ref-qualifier, too */
10048 rqual = declarator->u.function.ref_qualifier;
10049 /* And tx-qualifier. */
10050 tree tx_qual = declarator->u.function.tx_qualifier;
10051 /* Pick up the exception specifications. */
10052 raises = declarator->u.function.exception_specification;
10053 /* If the exception-specification is ill-formed, let's pretend
10054 there wasn't one. */
10055 if (raises == error_mark_node)
10056 raises = NULL_TREE;
10059 error_at (location_of (reqs), "requires-clause on return type");
10060 reqs = declarator->u.function.requires_clause;
10062 /* Say it's a definition only for the CALL_EXPR
10063 closest to the identifier. */
10064 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
10066 /* Handle a late-specified return type. */
10069 if (type_uses_auto (type))
10071 if (!declarator->u.function.late_return_type)
10073 if (current_class_type
10074 && LAMBDA_TYPE_P (current_class_type))
10075 /* OK for C++11 lambdas. */;
10076 else if (cxx_dialect < cxx14)
10078 error ("%qs function uses "
10079 "%<auto%> type specifier without trailing "
10080 "return type", name);
10081 inform (input_location, "deduced return type "
10082 "only available with -std=c++14 or "
10087 error ("virtual function cannot "
10088 "have deduced return type");
10092 else if (!is_auto (type) && sfk != sfk_conversion)
10094 error ("%qs function with trailing return type has"
10095 " %qT as its type rather than plain %<auto%>",
10097 return error_mark_node;
10100 else if (declarator->u.function.late_return_type
10101 && sfk != sfk_conversion)
10103 if (cxx_dialect < cxx11)
10104 /* Not using maybe_warn_cpp0x because this should
10105 always be an error. */
10106 error ("trailing return type only available with "
10107 "-std=c++11 or -std=gnu++11");
10109 error ("%qs function with trailing return type not "
10110 "declared with %<auto%> type specifier", name);
10111 return error_mark_node;
10114 type = splice_late_return_type
10115 (type, declarator->u.function.late_return_type);
10116 if (type == error_mark_node)
10117 return error_mark_node;
10119 if (declarator->u.function.late_return_type)
10120 late_return_type_p = true;
10122 if (ctype == NULL_TREE
10123 && decl_context == FIELD
10126 ctype = current_class_type;
10128 if (ctype && (sfk == sfk_constructor
10129 || sfk == sfk_destructor))
10131 /* We are within a class's scope. If our declarator name
10132 is the same as the class name, and we are defining
10133 a function, then it is a constructor/destructor, and
10134 therefore returns a void type. */
10136 /* ISO C++ 12.4/2. A destructor may not be declared
10137 const or volatile. A destructor may not be static.
10138 A destructor may not be declared with ref-qualifier.
10140 ISO C++ 12.1. A constructor may not be declared
10141 const or volatile. A constructor may not be
10142 virtual. A constructor may not be static.
10143 A constructor may not be declared with ref-qualifier. */
10145 error ((flags == DTOR_FLAG)
10146 ? G_("destructor cannot be static member function")
10147 : G_("constructor cannot be static member function"));
10150 error ((flags == DTOR_FLAG)
10151 ? G_("destructors may not be cv-qualified")
10152 : G_("constructors may not be cv-qualified"));
10153 memfn_quals = TYPE_UNQUALIFIED;
10158 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER);
10159 error ((flags == DTOR_FLAG)
10160 ? "destructors may not be ref-qualified"
10161 : "constructors may not be ref-qualified");
10162 rqual = REF_QUAL_NONE;
10165 if (decl_context == FIELD
10166 && !member_function_or_else (ctype,
10167 current_class_type,
10169 return error_mark_node;
10171 if (flags != DTOR_FLAG)
10173 /* It's a constructor. */
10174 if (explicitp == 1)
10178 permerror (input_location,
10179 "constructors cannot be declared %<virtual%>");
10182 if (decl_context == FIELD
10183 && sfk != sfk_constructor)
10184 return error_mark_node;
10186 if (decl_context == FIELD)
10193 /* Cannot be both friend and virtual. */
10194 error ("virtual functions cannot be friends");
10197 if (decl_context == NORMAL)
10198 error ("friend declaration not in class definition");
10199 if (current_function_decl && funcdef_flag)
10200 error ("can%'t define friend function %qs in a local "
10201 "class definition",
10204 else if (ctype && sfk == sfk_conversion)
10206 if (explicitp == 1)
10208 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
10211 if (late_return_type_p)
10212 error ("a conversion function cannot have a trailing return type");
10215 arg_types = grokparms (declarator->u.function.parameters,
10218 if (inner_declarator
10219 && inner_declarator->kind == cdk_id
10220 && inner_declarator->u.id.sfk == sfk_destructor
10221 && arg_types != void_list_node)
10223 error ("destructors may not have parameters");
10224 arg_types = void_list_node;
10228 type = build_function_type (type, arg_types);
10230 tree attrs = declarator->std_attributes;
10233 tree att = build_tree_list (tx_qual, NULL_TREE);
10234 /* transaction_safe applies to the type, but
10235 transaction_safe_dynamic applies to the function. */
10236 if (is_attribute_p ("transaction_safe", tx_qual))
10237 attrs = chainon (attrs, att);
10239 returned_attrs = chainon (returned_attrs, att);
10244 The optional attribute-specifier-seq appertains to
10245 the function type. */
10246 decl_attributes (&type, attrs, 0);
10251 case cdk_reference:
10253 /* Filter out pointers-to-references and references-to-references.
10254 We can get these if a TYPE_DECL is used. */
10256 if (TREE_CODE (type) == REFERENCE_TYPE)
10258 if (declarator->kind != cdk_reference)
10260 error ("cannot declare pointer to %q#T", type);
10261 type = TREE_TYPE (type);
10264 /* In C++0x, we allow reference to reference declarations
10265 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
10266 and template type arguments [14.3.1/4 temp.arg.type]. The
10267 check for direct reference to reference declarations, which
10268 are still forbidden, occurs below. Reasoning behind the change
10269 can be found in DR106, DR540, and the rvalue reference
10271 else if (cxx_dialect == cxx98)
10273 error ("cannot declare reference to %q#T", type);
10274 type = TREE_TYPE (type);
10277 else if (VOID_TYPE_P (type))
10279 if (declarator->kind == cdk_reference)
10280 error ("cannot declare reference to %q#T", type);
10281 else if (declarator->kind == cdk_ptrmem)
10282 error ("cannot declare pointer to %q#T member", type);
10285 /* We now know that the TYPE_QUALS don't apply to the decl,
10286 but to the target of the pointer. */
10287 type_quals = TYPE_UNQUALIFIED;
10289 /* This code used to handle METHOD_TYPE, but I don't think it's
10290 possible to get it here anymore. */
10291 gcc_assert (TREE_CODE (type) != METHOD_TYPE);
10292 if (declarator->kind == cdk_ptrmem
10293 && TREE_CODE (type) == FUNCTION_TYPE)
10295 memfn_quals |= type_memfn_quals (type);
10296 type = build_memfn_type (type,
10297 declarator->u.pointer.class_type,
10300 if (type == error_mark_node)
10301 return error_mark_node;
10303 rqual = REF_QUAL_NONE;
10304 memfn_quals = TYPE_UNQUALIFIED;
10307 if (TREE_CODE (type) == FUNCTION_TYPE
10308 && (type_memfn_quals (type) != TYPE_UNQUALIFIED
10309 || type_memfn_rqual (type) != REF_QUAL_NONE))
10310 error (declarator->kind == cdk_reference
10311 ? G_("cannot declare reference to qualified function type %qT")
10312 : G_("cannot declare pointer to qualified function type %qT"),
10315 /* When the pointed-to type involves components of variable size,
10316 care must be taken to ensure that the size evaluation code is
10317 emitted early enough to dominate all the possible later uses
10318 and late enough for the variables on which it depends to have
10321 This is expected to happen automatically when the pointed-to
10322 type has a name/declaration of it's own, but special attention
10323 is required if the type is anonymous.
10325 We handle the NORMAL and FIELD contexts here by inserting a
10326 dummy statement that just evaluates the size at a safe point
10327 and ensures it is not deferred until e.g. within a deeper
10328 conditional context (c++/43555).
10330 We expect nothing to be needed here for PARM or TYPENAME.
10331 Evaluating the size at this point for TYPENAME would
10332 actually be incorrect, as we might be in the middle of an
10333 expression with side effects on the pointed-to type size
10334 "arguments" prior to the pointer declaration point and the
10335 size evaluation could end up prior to the side effects. */
10337 if (!TYPE_NAME (type)
10338 && (decl_context == NORMAL || decl_context == FIELD)
10339 && at_function_scope_p ()
10340 && variably_modified_type_p (type, NULL_TREE))
10341 /* Force evaluation of the SAVE_EXPR. */
10342 finish_expr_stmt (TYPE_SIZE (type));
10344 if (declarator->kind == cdk_reference)
10346 /* In C++0x, the type we are creating a reference to might be
10347 a typedef which is itself a reference type. In that case,
10348 we follow the reference collapsing rules in
10349 [7.1.3/8 dcl.typedef] to create the final reference type:
10351 "If a typedef TD names a type that is a reference to a type
10352 T, an attempt to create the type 'lvalue reference to cv TD'
10353 creates the type 'lvalue reference to T,' while an attempt
10354 to create the type "rvalue reference to cv TD' creates the
10357 if (VOID_TYPE_P (type))
10358 /* We already gave an error. */;
10359 else if (TREE_CODE (type) == REFERENCE_TYPE)
10361 if (declarator->u.reference.rvalue_ref)
10362 /* Leave type alone. */;
10364 type = cp_build_reference_type (TREE_TYPE (type), false);
10367 type = cp_build_reference_type
10368 (type, declarator->u.reference.rvalue_ref);
10370 /* In C++0x, we need this check for direct reference to
10371 reference declarations, which are forbidden by
10372 [8.3.2/5 dcl.ref]. Reference to reference declarations
10373 are only allowed indirectly through typedefs and template
10374 type arguments. Example:
10376 void foo(int & &); // invalid ref-to-ref decl
10378 typedef int & int_ref;
10379 void foo(int_ref &); // valid ref-to-ref decl
10381 if (inner_declarator && inner_declarator->kind == cdk_reference)
10382 error ("cannot declare reference to %q#T, which is not "
10383 "a typedef or a template type argument", type);
10385 else if (TREE_CODE (type) == METHOD_TYPE)
10386 type = build_ptrmemfunc_type (build_pointer_type (type));
10387 else if (declarator->kind == cdk_ptrmem)
10389 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
10390 != NAMESPACE_DECL);
10391 if (declarator->u.pointer.class_type == error_mark_node)
10392 /* We will already have complained. */
10393 type = error_mark_node;
10395 type = build_ptrmem_type (declarator->u.pointer.class_type,
10399 type = build_pointer_type (type);
10401 /* Process a list of type modifier keywords (such as
10402 const or volatile) that were given inside the `*' or `&'. */
10404 if (declarator->u.pointer.qualifiers)
10407 = cp_build_qualified_type (type,
10408 declarator->u.pointer.qualifiers);
10409 type_quals = cp_type_quals (type);
10412 /* Apply C++11 attributes to the pointer, and not to the
10413 type pointed to. This is unlike what is done for GNU
10414 attributes above. It is to comply with [dcl.ptr]/1:
10416 [the optional attribute-specifier-seq (7.6.1) appertains
10417 to the pointer and not to the object pointed to]. */
10418 if (declarator->std_attributes)
10419 decl_attributes (&type, declarator->std_attributes,
10429 gcc_unreachable ();
10433 /* A `constexpr' specifier used in an object declaration declares
10434 the object as `const'. */
10435 if (constexpr_p && innermost_code != cdk_function)
10437 /* DR1688 says that a `constexpr' specifier in combination with
10438 `volatile' is valid. */
10440 if (TREE_CODE (type) != REFERENCE_TYPE)
10442 type_quals |= TYPE_QUAL_CONST;
10443 type = cp_build_qualified_type (type, type_quals);
10447 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
10448 && TREE_CODE (type) != FUNCTION_TYPE
10449 && TREE_CODE (type) != METHOD_TYPE
10450 && !variable_template_p (TREE_OPERAND (unqualified_id, 0)))
10452 error ("template-id %qD used as a declarator",
10454 unqualified_id = dname;
10457 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
10458 qualified with a class-name, turn it into a METHOD_TYPE, unless
10459 we know that the function is static. We take advantage of this
10460 opportunity to do other processing that pertains to entities
10461 explicitly declared to be class members. Note that if DECLARATOR
10462 is non-NULL, we know it is a cdk_id declarator; otherwise, we
10463 would not have exited the loop above. */
10465 && declarator->u.id.qualifying_scope
10466 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
10468 ctype = declarator->u.id.qualifying_scope;
10469 ctype = TYPE_MAIN_VARIANT (ctype);
10470 template_count = num_template_headers_for_class (ctype);
10472 if (ctype == current_class_type)
10476 permerror (input_location, "member functions are implicitly friends of their class");
10480 permerror (declarator->id_loc,
10481 "extra qualification %<%T::%> on member %qs",
10484 else if (/* If the qualifying type is already complete, then we
10485 can skip the following checks. */
10486 !COMPLETE_TYPE_P (ctype)
10487 && (/* If the function is being defined, then
10488 qualifying type must certainly be complete. */
10490 /* A friend declaration of "T::f" is OK, even if
10491 "T" is a template parameter. But, if this
10492 function is not a friend, the qualifying type
10493 must be a class. */
10494 || (!friendp && !CLASS_TYPE_P (ctype))
10495 /* For a declaration, the type need not be
10496 complete, if either it is dependent (since there
10497 is no meaningful definition of complete in that
10498 case) or the qualifying class is currently being
10500 || !(dependent_type_p (ctype)
10501 || currently_open_class (ctype)))
10502 /* Check that the qualifying type is complete. */
10503 && !complete_type_or_else (ctype, NULL_TREE))
10504 return error_mark_node;
10505 else if (TREE_CODE (type) == FUNCTION_TYPE)
10507 if (current_class_type
10508 && (!friendp || funcdef_flag))
10510 error (funcdef_flag
10511 ? G_("cannot define member function %<%T::%s%> "
10513 : G_("cannot declare member function %<%T::%s%> "
10515 ctype, name, current_class_type);
10516 return error_mark_node;
10519 else if (typedef_p && current_class_type)
10521 error ("cannot declare member %<%T::%s%> within %qT",
10522 ctype, name, current_class_type);
10523 return error_mark_node;
10527 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
10528 ctype = current_class_type;
10530 /* Now TYPE has the actual type. */
10532 if (returned_attrs)
10535 *attrlist = chainon (returned_attrs, *attrlist);
10537 attrlist = &returned_attrs;
10541 && declarator->kind == cdk_id
10542 && declarator->std_attributes)
10543 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
10544 a declarator-id appertains to the entity that is declared. */
10545 *attrlist = chainon (*attrlist, declarator->std_attributes);
10547 /* Handle parameter packs. */
10548 if (parameter_pack_p)
10550 if (decl_context == PARM)
10551 /* Turn the type into a pack expansion.*/
10552 type = make_pack_expansion (type);
10554 error ("non-parameter %qs cannot be a parameter pack", name);
10557 if ((decl_context == FIELD || decl_context == PARM)
10558 && !processing_template_decl
10559 && variably_modified_type_p (type, NULL_TREE))
10561 if (decl_context == FIELD)
10562 error ("data member may not have variably modified type %qT", type);
10564 error ("parameter may not have variably modified type %qT", type);
10565 type = error_mark_node;
10568 if (explicitp == 1 || (explicitp && friendp))
10570 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
10571 in the declaration of a constructor or conversion function within
10572 a class definition. */
10573 if (!current_class_type)
10574 error_at (declspecs->locations[ds_explicit],
10575 "%<explicit%> outside class declaration");
10577 error_at (declspecs->locations[ds_explicit],
10578 "%<explicit%> in friend declaration");
10580 error_at (declspecs->locations[ds_explicit],
10581 "only declarations of constructors and conversion operators "
10582 "can be %<explicit%>");
10586 if (storage_class == sc_mutable)
10588 if (decl_context != FIELD || friendp)
10590 error ("non-member %qs cannot be declared %<mutable%>", name);
10591 storage_class = sc_none;
10593 else if (decl_context == TYPENAME || typedef_p)
10595 error ("non-object member %qs cannot be declared %<mutable%>", name);
10596 storage_class = sc_none;
10598 else if (TREE_CODE (type) == FUNCTION_TYPE
10599 || TREE_CODE (type) == METHOD_TYPE)
10601 error ("function %qs cannot be declared %<mutable%>", name);
10602 storage_class = sc_none;
10606 error ("static %qs cannot be declared %<mutable%>", name);
10607 storage_class = sc_none;
10609 else if (type_quals & TYPE_QUAL_CONST)
10611 error ("const %qs cannot be declared %<mutable%>", name);
10612 storage_class = sc_none;
10614 else if (TREE_CODE (type) == REFERENCE_TYPE)
10616 permerror (input_location, "reference %qs cannot be declared "
10617 "%<mutable%>", name);
10618 storage_class = sc_none;
10622 /* If this is declaring a typedef name, return a TYPE_DECL. */
10623 if (typedef_p && decl_context != TYPENAME)
10627 /* Note that the grammar rejects storage classes
10628 in typenames, fields or parameters. */
10629 if (current_lang_name == lang_name_java)
10630 TYPE_FOR_JAVA (type) = 1;
10632 /* This declaration:
10634 typedef void f(int) const;
10636 declares a function type which is not a member of any
10637 particular class, but which is cv-qualified; for
10638 example "f S::*" declares a pointer to a const-qualified
10639 member function of S. We record the cv-qualification in the
10641 if ((rqual || memfn_quals) && TREE_CODE (type) == FUNCTION_TYPE)
10643 type = apply_memfn_quals (type, memfn_quals, rqual);
10645 /* We have now dealt with these qualifiers. */
10646 memfn_quals = TYPE_UNQUALIFIED;
10647 rqual = REF_QUAL_NONE;
10650 if (type_uses_auto (type))
10652 error ("typedef declared %<auto%>");
10653 type = error_mark_node;
10657 error_at (location_of (reqs), "requires-clause on typedef");
10659 if (decl_context == FIELD)
10660 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
10662 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
10663 if (id_declarator && declarator->u.id.qualifying_scope) {
10664 error_at (DECL_SOURCE_LOCATION (decl),
10665 "typedef name may not be a nested-name-specifier");
10666 TREE_TYPE (decl) = error_mark_node;
10669 if (decl_context != FIELD)
10671 if (!current_function_decl)
10672 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
10673 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
10674 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
10675 (current_function_decl)))
10676 /* The TYPE_DECL is "abstract" because there will be
10677 clones of this constructor/destructor, and there will
10678 be copies of this TYPE_DECL generated in those
10679 clones. The decloning optimization (for space) may
10680 revert this subsequently if it determines that
10681 the clones should share a common implementation. */
10682 DECL_ABSTRACT_P (decl) = true;
10684 else if (current_class_type
10685 && constructor_name_p (unqualified_id, current_class_type))
10686 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
10687 "as enclosing class",
10690 /* If the user declares "typedef struct {...} foo" then the
10691 struct will have an anonymous name. Fill that name in now.
10692 Nothing can refer to it, so nothing needs know about the name
10694 if (type != error_mark_node
10696 && TYPE_NAME (type)
10697 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
10698 && TYPE_ANONYMOUS_P (type)
10699 && declspecs->type_definition_p
10700 && attributes_naming_typedef_ok (*attrlist)
10701 && cp_type_quals (type) == TYPE_UNQUALIFIED)
10705 /* Replace the anonymous name with the real name everywhere. */
10706 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
10708 if (anon_aggrname_p (TYPE_IDENTIFIER (t)))
10709 /* We do not rename the debug info representing the
10710 anonymous tagged type because the standard says in
10711 [dcl.typedef] that the naming applies only for
10712 linkage purposes. */
10713 /*debug_hooks->set_name (t, decl);*/
10714 TYPE_NAME (t) = decl;
10717 if (TYPE_LANG_SPECIFIC (type))
10718 TYPE_WAS_ANONYMOUS (type) = 1;
10720 /* If this is a typedef within a template class, the nested
10721 type is a (non-primary) template. The name for the
10722 template needs updating as well. */
10723 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
10724 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
10725 = TYPE_IDENTIFIER (type);
10727 /* Adjust linkage now that we aren't anonymous anymore. */
10728 reset_type_linkage (type);
10730 /* FIXME remangle member functions; member functions of a
10731 type with external linkage have external linkage. */
10735 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
10736 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
10738 bad_specifiers (decl, BSP_TYPE, virtualp,
10739 memfn_quals != TYPE_UNQUALIFIED,
10740 inlinep, friendp, raises != NULL_TREE);
10742 if (decl_spec_seq_has_spec_p (declspecs, ds_alias))
10743 /* Acknowledge that this was written:
10744 `using analias = atype;'. */
10745 TYPE_DECL_ALIAS_P (decl) = 1;
10750 /* Detect the case of an array type of unspecified size
10751 which came, as such, direct from a typedef name.
10752 We must copy the type, so that the array's domain can be
10753 individually set by the object's initializer. */
10755 if (type && typedef_type
10756 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
10757 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
10758 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
10760 /* Detect where we're using a typedef of function type to declare a
10761 function. PARMS will not be set, so we must create it now. */
10763 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
10765 tree decls = NULL_TREE;
10768 for (args = TYPE_ARG_TYPES (type);
10769 args && args != void_list_node;
10770 args = TREE_CHAIN (args))
10772 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
10774 DECL_CHAIN (decl) = decls;
10778 parms = nreverse (decls);
10780 if (decl_context != TYPENAME)
10782 /* The qualifiers on the function type become the qualifiers on
10783 the non-static member function. */
10784 memfn_quals |= type_memfn_quals (type);
10785 rqual = type_memfn_rqual (type);
10786 type_quals = TYPE_UNQUALIFIED;
10790 /* If this is a type name (such as, in a cast or sizeof),
10791 compute the type and return it now. */
10793 if (decl_context == TYPENAME)
10795 /* Note that here we don't care about type_quals. */
10797 /* Special case: "friend class foo" looks like a TYPENAME context. */
10802 error ("%<inline%> specified for friend class declaration");
10808 /* Don't allow friend declaration without a class-key. */
10809 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10810 permerror (input_location, "template parameters cannot be friends");
10811 else if (TREE_CODE (type) == TYPENAME_TYPE)
10812 permerror (input_location, "friend declaration requires class-key, "
10813 "i.e. %<friend class %T::%D%>",
10814 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
10816 permerror (input_location, "friend declaration requires class-key, "
10817 "i.e. %<friend %#T%>",
10821 /* Only try to do this stuff if we didn't already give up. */
10822 if (type != integer_type_node)
10824 /* A friendly class? */
10825 if (current_class_type)
10826 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
10827 /*complain=*/true);
10829 error ("trying to make class %qT a friend of global scope",
10832 type = void_type_node;
10835 else if (memfn_quals || rqual)
10837 if (ctype == NULL_TREE
10838 && TREE_CODE (type) == METHOD_TYPE)
10839 ctype = TYPE_METHOD_BASETYPE (type);
10842 type = build_memfn_type (type, ctype, memfn_quals, rqual);
10843 /* Core issue #547: need to allow this in template type args.
10844 Allow it in general in C++11 for alias-declarations. */
10845 else if ((template_type_arg || cxx_dialect >= cxx11)
10846 && TREE_CODE (type) == FUNCTION_TYPE)
10847 type = apply_memfn_quals (type, memfn_quals, rqual);
10849 error ("invalid qualifiers on non-member function type");
10853 error_at (location_of (reqs), "requires-clause on type-id");
10857 else if (unqualified_id == NULL_TREE && decl_context != PARM
10858 && decl_context != CATCHPARM
10859 && TREE_CODE (type) != UNION_TYPE
10862 error ("abstract declarator %qT used as declaration", type);
10863 return error_mark_node;
10866 /* Only functions may be declared using an operator-function-id. */
10868 && IDENTIFIER_OPNAME_P (unqualified_id)
10869 && TREE_CODE (type) != FUNCTION_TYPE
10870 && TREE_CODE (type) != METHOD_TYPE)
10872 error ("declaration of %qD as non-function", unqualified_id);
10873 return error_mark_node;
10877 && TREE_CODE (type) != FUNCTION_TYPE
10878 && TREE_CODE (type) != METHOD_TYPE)
10879 error_at (location_of (reqs),
10880 "requires-clause on declaration of non-function type %qT",
10883 /* We don't check parameter types here because we can emit a better
10884 error message later. */
10885 if (decl_context != PARM)
10887 type = check_var_type (unqualified_id, type);
10888 if (type == error_mark_node)
10889 return error_mark_node;
10892 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
10893 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
10895 if (decl_context == PARM || decl_context == CATCHPARM)
10897 if (ctype || in_namespace)
10898 error ("cannot use %<::%> in parameter declaration");
10900 if (type_uses_auto (type))
10902 if (cxx_dialect >= cxx14)
10903 error ("%<auto%> parameter not permitted in this context");
10905 error ("parameter declared %<auto%>");
10906 type = error_mark_node;
10909 /* A parameter declared as an array of T is really a pointer to T.
10910 One declared as a function is really a pointer to a function.
10911 One declared as a member is really a pointer to member. */
10913 if (TREE_CODE (type) == ARRAY_TYPE)
10915 /* Transfer const-ness of array into that of type pointed to. */
10916 type = build_pointer_type (TREE_TYPE (type));
10917 type_quals = TYPE_UNQUALIFIED;
10918 array_parameter_p = true;
10920 else if (TREE_CODE (type) == FUNCTION_TYPE)
10921 type = build_pointer_type (type);
10924 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
10925 && !NEW_DELETE_OPNAME_P (unqualified_id))
10927 cp_cv_quals real_quals = memfn_quals;
10928 if (cxx_dialect < cxx14 && constexpr_p
10929 && sfk != sfk_constructor && sfk != sfk_destructor)
10930 real_quals |= TYPE_QUAL_CONST;
10931 type = build_memfn_type (type, ctype, real_quals, rqual);
10935 tree decl = NULL_TREE;
10937 if (decl_context == PARM)
10939 decl = cp_build_parm_decl (unqualified_id, type);
10940 DECL_ARRAY_PARAMETER_P (decl) = array_parameter_p;
10942 bad_specifiers (decl, BSP_PARM, virtualp,
10943 memfn_quals != TYPE_UNQUALIFIED,
10944 inlinep, friendp, raises != NULL_TREE);
10946 else if (decl_context == FIELD)
10948 if (!staticp && !friendp && TREE_CODE (type) != METHOD_TYPE
10949 && type_uses_auto (type))
10951 error ("non-static data member declared %<auto%>");
10952 type = error_mark_node;
10955 /* The C99 flexible array extension. */
10956 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
10957 && TYPE_DOMAIN (type) == NULL_TREE)
10960 && (TREE_CODE (ctype) == UNION_TYPE
10961 || TREE_CODE (ctype) == QUAL_UNION_TYPE))
10963 error ("flexible array member in union");
10964 type = error_mark_node;
10968 /* Flexible array member has a null domain. */
10969 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
10973 if (type == error_mark_node)
10975 /* Happens when declaring arrays of sizes which
10976 are error_mark_node, for example. */
10979 else if (in_namespace && !friendp)
10981 /* Something like struct S { int N::j; }; */
10982 error ("invalid use of %<::%>");
10983 return error_mark_node;
10985 else if (TREE_CODE (type) == FUNCTION_TYPE
10986 || TREE_CODE (type) == METHOD_TYPE)
10989 tree function_context;
10993 /* This should never happen in pure C++ (the check
10994 could be an assert). It could happen in
10995 Objective-C++ if someone writes invalid code that
10996 uses a function declaration for an instance
10997 variable or property (instance variables and
10998 properties are parsed as FIELD_DECLs, but they are
10999 part of an Objective-C class, not a C++ class).
11000 That code is invalid and is caught by this
11004 error ("declaration of function %qD in invalid context",
11006 return error_mark_node;
11009 /* ``A union may [ ... ] not [ have ] virtual functions.''
11011 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
11013 error ("function %qD declared %<virtual%> inside a union",
11015 return error_mark_node;
11018 if (NEW_DELETE_OPNAME_P (unqualified_id))
11022 error ("%qD cannot be declared %<virtual%>, since it "
11023 "is always static",
11030 /* Check that the name used for a destructor makes sense. */
11031 if (sfk == sfk_destructor)
11033 tree uqname = id_declarator->u.id.unqualified_name;
11037 gcc_assert (friendp);
11038 error ("expected qualified name in friend declaration "
11039 "for destructor %qD", uqname);
11040 return error_mark_node;
11043 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
11045 error ("declaration of %qD as member of %qT",
11047 return error_mark_node;
11051 error ("a destructor cannot be %<concept%>");
11052 return error_mark_node;
11056 error ("a destructor cannot be %<constexpr%>");
11057 return error_mark_node;
11060 else if (sfk == sfk_constructor && friendp && !ctype)
11062 error ("expected qualified name in friend declaration "
11063 "for constructor %qD",
11064 id_declarator->u.id.unqualified_name);
11065 return error_mark_node;
11067 if (sfk == sfk_constructor)
11070 error ("a constructor cannot be %<concept%>");
11071 return error_mark_node;
11075 error ("a concept cannot be a member function");
11079 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
11081 tree tmpl = TREE_OPERAND (unqualified_id, 0);
11082 if (variable_template_p (tmpl))
11084 error ("specialization of variable template %qD "
11085 "declared as function", tmpl);
11086 inform (DECL_SOURCE_LOCATION (tmpl),
11087 "variable template declared here");
11088 return error_mark_node;
11092 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
11093 function_context = (ctype != NULL_TREE) ?
11094 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
11095 publicp = (! friendp || ! staticp)
11096 && function_context == NULL_TREE;
11098 if (late_return_type_p)
11099 TYPE_HAS_LATE_RETURN_TYPE (type) = 1;
11101 decl = grokfndecl (ctype, type,
11102 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
11103 ? unqualified_id : dname,
11107 virtualp, flags, memfn_quals, rqual, raises,
11108 friendp ? -1 : 0, friendp, publicp,
11109 inlinep | (2 * constexpr_p) | (4 * concept_p),
11110 initialized == SD_DELETED, sfk,
11111 funcdef_flag, template_count, in_namespace,
11112 attrlist, declarator->id_loc);
11113 decl = set_virt_specifiers (decl, virt_specifiers);
11114 if (decl == NULL_TREE)
11115 return error_mark_node;
11117 /* This clobbers the attrs stored in `decl' from `attrlist'. */
11118 /* The decl and setting of decl_attr is also turned off. */
11119 decl = build_decl_attribute_variant (decl, decl_attr);
11122 /* [class.conv.ctor]
11124 A constructor declared without the function-specifier
11125 explicit that can be called with a single parameter
11126 specifies a conversion from the type of its first
11127 parameter to the type of its class. Such a constructor
11128 is called a converting constructor. */
11129 if (explicitp == 2)
11130 DECL_NONCONVERTING_P (decl) = 1;
11132 else if (!staticp && !dependent_type_p (type)
11133 && !COMPLETE_TYPE_P (complete_type (type))
11134 && (TREE_CODE (type) != ARRAY_TYPE
11135 || !COMPLETE_TYPE_P (TREE_TYPE (type))
11136 || initialized == 0))
11138 if (TREE_CODE (type) != ARRAY_TYPE
11139 || !COMPLETE_TYPE_P (TREE_TYPE (type)))
11141 if (unqualified_id)
11143 error ("field %qD has incomplete type %qT",
11144 unqualified_id, type);
11145 cxx_incomplete_type_inform (strip_array_types (type));
11148 error ("name %qT has incomplete type", type);
11150 type = error_mark_node;
11158 error ("%qE is neither function nor member function; "
11159 "cannot be declared friend", unqualified_id);
11167 /* Friends are treated specially. */
11168 if (ctype == current_class_type)
11169 ; /* We already issued a permerror. */
11170 else if (decl && DECL_NAME (decl))
11172 if (template_class_depth (current_class_type) == 0)
11174 decl = check_explicit_specialization
11175 (unqualified_id, decl, template_count,
11176 2 * funcdef_flag + 4);
11177 if (decl == error_mark_node)
11178 return error_mark_node;
11181 decl = do_friend (ctype, unqualified_id, decl,
11187 return error_mark_node;
11190 /* Structure field. It may not be a function, except for C++. */
11192 if (decl == NULL_TREE)
11196 /* C++ allows static class members. All other work
11197 for this is done by grokfield. */
11198 decl = build_lang_decl_loc (declarator
11199 ? declarator->id_loc
11201 VAR_DECL, unqualified_id, type);
11202 set_linkage_for_static_data_member (decl);
11203 /* Even if there is an in-class initialization, DECL
11204 is considered undefined until an out-of-class
11205 definition is provided. */
11206 DECL_EXTERNAL (decl) = 1;
11210 CP_DECL_THREAD_LOCAL_P (decl) = true;
11211 if (!processing_template_decl)
11212 set_decl_tls_model (decl, decl_default_tls_model (decl));
11213 if (declspecs->gnu_thread_keyword_p)
11214 SET_DECL_GNU_TLS_P (decl);
11217 error ("static data member %qE declared %<concept%>",
11219 else if (constexpr_p && !initialized)
11221 error ("constexpr static data member %qD must have an "
11222 "initializer", decl);
11223 constexpr_p = false;
11229 error ("non-static data member %qE declared %<concept%>",
11231 else if (constexpr_p)
11233 error ("non-static data member %qE declared %<constexpr%>",
11235 constexpr_p = false;
11237 decl = build_decl (input_location,
11238 FIELD_DECL, unqualified_id, type);
11239 DECL_NONADDRESSABLE_P (decl) = bitfield;
11240 if (bitfield && !unqualified_id)
11241 TREE_NO_WARNING (decl) = 1;
11243 if (storage_class == sc_mutable)
11245 DECL_MUTABLE_P (decl) = 1;
11246 storage_class = sc_none;
11251 /* An attempt is being made to initialize a non-static
11252 member. This is new in C++11. */
11253 maybe_warn_cpp0x (CPP0X_NSDMI);
11255 /* If this has been parsed with static storage class, but
11256 errors forced staticp to be cleared, ensure NSDMI is
11258 if (declspecs->storage_class == sc_static)
11259 DECL_INITIAL (decl) = error_mark_node;
11263 bad_specifiers (decl, BSP_FIELD, virtualp,
11264 memfn_quals != TYPE_UNQUALIFIED,
11265 inlinep, friendp, raises != NULL_TREE);
11268 else if (TREE_CODE (type) == FUNCTION_TYPE
11269 || TREE_CODE (type) == METHOD_TYPE)
11271 tree original_name;
11274 if (!unqualified_id)
11275 return error_mark_node;
11277 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
11278 original_name = dname;
11280 original_name = unqualified_id;
11282 if (storage_class == sc_auto)
11283 error ("storage class %<auto%> invalid for function %qs", name);
11284 else if (storage_class == sc_register)
11285 error ("storage class %<register%> invalid for function %qs", name);
11288 if (declspecs->gnu_thread_keyword_p)
11289 error ("storage class %<__thread%> invalid for function %qs",
11292 error ("storage class %<thread_local%> invalid for function %qs",
11296 if (virt_specifiers)
11297 error ("virt-specifiers in %qs not allowed outside a class definition", name);
11298 /* Function declaration not at top level.
11299 Storage classes other than `extern' are not allowed
11300 and `extern' makes no difference. */
11301 if (! toplevel_bindings_p ()
11302 && (storage_class == sc_static
11303 || decl_spec_seq_has_spec_p (declspecs, ds_inline))
11306 if (storage_class == sc_static)
11307 pedwarn (input_location, OPT_Wpedantic,
11308 "%<static%> specified invalid for function %qs "
11309 "declared out of global scope", name);
11311 pedwarn (input_location, OPT_Wpedantic,
11312 "%<inline%> specifier invalid for function %qs "
11313 "declared out of global scope", name);
11316 if (ctype == NULL_TREE)
11320 error ("virtual non-class function %qs", name);
11323 else if (sfk == sfk_constructor
11324 || sfk == sfk_destructor)
11326 error (funcdef_flag
11327 ? G_("%qs defined in a non-class scope")
11328 : G_("%qs declared in a non-class scope"), name);
11333 /* Record whether the function is public. */
11334 publicp = (ctype != NULL_TREE
11335 || storage_class != sc_static);
11337 if (late_return_type_p)
11338 TYPE_HAS_LATE_RETURN_TYPE (type) = 1;
11340 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
11341 reqs, virtualp, flags, memfn_quals, rqual, raises,
11344 inlinep | (2 * constexpr_p) | (4 * concept_p),
11345 initialized == SD_DELETED,
11348 template_count, in_namespace, attrlist,
11349 declarator->id_loc);
11350 if (decl == NULL_TREE)
11351 return error_mark_node;
11355 int invalid_static = 0;
11357 /* Don't allow a static member function in a class, and forbid
11358 declaring main to be static. */
11359 if (TREE_CODE (type) == METHOD_TYPE)
11361 permerror (input_location, "cannot declare member function %qD to have "
11362 "static linkage", decl);
11363 invalid_static = 1;
11365 else if (current_function_decl)
11367 /* FIXME need arm citation */
11368 error ("cannot declare static function inside another function");
11369 invalid_static = 1;
11372 if (invalid_static)
11375 storage_class = sc_none;
11381 /* It's a variable. */
11383 /* An uninitialized decl with `extern' is a reference. */
11384 decl = grokvardecl (type, dname, unqualified_id,
11387 ((type_quals & TYPE_QUAL_CONST) != 0) | (2 * concept_p),
11389 ctype ? ctype : in_namespace);
11390 if (decl == NULL_TREE)
11391 return error_mark_node;
11393 bad_specifiers (decl, BSP_VAR, virtualp,
11394 memfn_quals != TYPE_UNQUALIFIED,
11395 inlinep, friendp, raises != NULL_TREE);
11399 DECL_CONTEXT (decl) = ctype;
11402 permerror (input_location, "%<static%> may not be used when defining "
11403 "(as opposed to declaring) a static data member");
11405 storage_class = sc_none;
11407 if (storage_class == sc_register && TREE_STATIC (decl))
11409 error ("static member %qD declared %<register%>", decl);
11410 storage_class = sc_none;
11412 if (storage_class == sc_extern && pedantic)
11414 pedwarn (input_location, OPT_Wpedantic,
11415 "cannot explicitly declare member %q#D to have "
11416 "extern linkage", decl);
11417 storage_class = sc_none;
11420 else if (constexpr_p && DECL_EXTERNAL (decl))
11422 error ("declaration of constexpr variable %qD is not a definition",
11424 constexpr_p = false;
11428 if (storage_class == sc_extern && initialized && !funcdef_flag)
11430 if (toplevel_bindings_p ())
11432 /* It's common practice (and completely valid) to have a const
11433 be initialized and declared extern. */
11434 if (!(type_quals & TYPE_QUAL_CONST))
11435 warning (0, "%qs initialized and declared %<extern%>", name);
11439 error ("%qs has both %<extern%> and initializer", name);
11440 return error_mark_node;
11444 /* Record `register' declaration for warnings on &
11445 and in case doing stupid register allocation. */
11447 if (storage_class == sc_register)
11448 DECL_REGISTER (decl) = 1;
11449 else if (storage_class == sc_extern)
11450 DECL_THIS_EXTERN (decl) = 1;
11451 else if (storage_class == sc_static)
11452 DECL_THIS_STATIC (decl) = 1;
11454 /* Set constexpr flag on vars (functions got it in grokfndecl). */
11455 if (constexpr_p && VAR_P (decl))
11456 DECL_DECLARED_CONSTEXPR_P (decl) = true;
11458 /* Record constancy and volatility on the DECL itself . There's
11459 no need to do this when processing a template; we'll do this
11460 for the instantiated declaration based on the type of DECL. */
11461 if (!processing_template_decl)
11462 cp_apply_type_quals_to_decl (type_quals, decl);
11468 /* Subroutine of start_function. Ensure that each of the parameter
11469 types (as listed in PARMS) is complete, as is required for a
11470 function definition. */
11473 require_complete_types_for_parms (tree parms)
11475 for (; parms; parms = DECL_CHAIN (parms))
11477 if (dependent_type_p (TREE_TYPE (parms)))
11479 if (!VOID_TYPE_P (TREE_TYPE (parms))
11480 && complete_type_or_else (TREE_TYPE (parms), parms))
11482 relayout_decl (parms);
11483 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
11486 /* grokparms or complete_type_or_else will have already issued
11488 TREE_TYPE (parms) = error_mark_node;
11492 /* Returns nonzero if T is a local variable. */
11495 local_variable_p (const_tree t)
11498 /* A VAR_DECL with a context that is a _TYPE is a static data
11500 && !TYPE_P (CP_DECL_CONTEXT (t))
11501 /* Any other non-local variable must be at namespace scope. */
11502 && !DECL_NAMESPACE_SCOPE_P (t))
11503 || (TREE_CODE (t) == PARM_DECL))
11509 /* Like local_variable_p, but suitable for use as a tree-walking
11513 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
11516 if (local_variable_p (*tp)
11517 && (!DECL_ARTIFICIAL (*tp) || DECL_NAME (*tp) == this_identifier))
11519 else if (TYPE_P (*tp))
11520 *walk_subtrees = 0;
11525 /* Check that ARG, which is a default-argument expression for a
11526 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
11527 something goes wrong. DECL may also be a _TYPE node, rather than a
11528 DECL, if there is no DECL available. */
11531 check_default_argument (tree decl, tree arg, tsubst_flags_t complain)
11536 if (TREE_CODE (arg) == DEFAULT_ARG)
11537 /* We get a DEFAULT_ARG when looking at an in-class declaration
11538 with a default argument. Ignore the argument for now; we'll
11539 deal with it after the class is complete. */
11548 decl_type = TREE_TYPE (decl);
11550 if (arg == error_mark_node
11551 || decl == error_mark_node
11552 || TREE_TYPE (arg) == error_mark_node
11553 || decl_type == error_mark_node)
11554 /* Something already went wrong. There's no need to check
11556 return error_mark_node;
11558 /* [dcl.fct.default]
11560 A default argument expression is implicitly converted to the
11562 ++cp_unevaluated_operand;
11563 perform_implicit_conversion_flags (decl_type, arg, complain,
11565 --cp_unevaluated_operand;
11567 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
11569 if (TYPE_PTR_OR_PTRMEM_P (decl_type)
11570 && null_ptr_cst_p (arg))
11571 return nullptr_node;
11573 /* [dcl.fct.default]
11575 Local variables shall not be used in default argument
11578 The keyword `this' shall not be used in a default argument of a
11579 member function. */
11580 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
11583 if (complain & tf_warning_or_error)
11585 if (DECL_NAME (var) == this_identifier)
11586 permerror (input_location, "default argument %qE uses %qD",
11589 error ("default argument %qE uses local variable %qD", arg, var);
11591 return error_mark_node;
11598 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
11601 type_is_deprecated (tree type)
11603 enum tree_code code;
11604 if (TREE_DEPRECATED (type))
11606 if (TYPE_NAME (type))
11608 if (TREE_DEPRECATED (TYPE_NAME (type)))
11614 /* Do warn about using typedefs to a deprecated class. */
11615 if (OVERLOAD_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
11616 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
11618 code = TREE_CODE (type);
11620 if (code == POINTER_TYPE || code == REFERENCE_TYPE
11621 || code == OFFSET_TYPE || code == FUNCTION_TYPE
11622 || code == METHOD_TYPE || code == ARRAY_TYPE)
11623 return type_is_deprecated (TREE_TYPE (type));
11625 if (TYPE_PTRMEMFUNC_P (type))
11626 return type_is_deprecated
11627 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
11632 /* Decode the list of parameter types for a function type.
11633 Given the list of things declared inside the parens,
11634 return a list of types.
11636 If this parameter does not end with an ellipsis, we append
11639 *PARMS is set to the chain of PARM_DECLs created. */
11642 grokparms (tree parmlist, tree *parms)
11644 tree result = NULL_TREE;
11645 tree decls = NULL_TREE;
11649 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
11651 tree type = NULL_TREE;
11652 tree init = TREE_PURPOSE (parm);
11653 tree decl = TREE_VALUE (parm);
11654 const char *errmsg;
11656 if (parm == void_list_node)
11659 if (! decl || TREE_TYPE (decl) == error_mark_node)
11662 type = TREE_TYPE (decl);
11663 if (VOID_TYPE_P (type))
11665 if (same_type_p (type, void_type_node)
11667 && !DECL_NAME (decl) && !result
11668 && TREE_CHAIN (parm) == void_list_node)
11669 /* DR 577: A parameter list consisting of a single
11670 unnamed parameter of non-dependent type 'void'. */
11672 else if (cv_qualified_p (type))
11673 error_at (DECL_SOURCE_LOCATION (decl),
11674 "invalid use of cv-qualified type %qT in "
11675 "parameter declaration", type);
11677 error_at (DECL_SOURCE_LOCATION (decl),
11678 "invalid use of type %<void%> in parameter "
11680 /* It's not a good idea to actually create parameters of
11681 type `void'; other parts of the compiler assume that a
11682 void type terminates the parameter list. */
11683 type = error_mark_node;
11684 TREE_TYPE (decl) = error_mark_node;
11687 if (type != error_mark_node
11688 && TYPE_FOR_JAVA (type)
11689 && MAYBE_CLASS_TYPE_P (type))
11691 error ("parameter %qD has Java class type", decl);
11692 type = error_mark_node;
11693 TREE_TYPE (decl) = error_mark_node;
11697 if (type != error_mark_node
11698 && (errmsg = targetm.invalid_parameter_type (type)))
11701 type = error_mark_node;
11702 TREE_TYPE (decl) = error_mark_node;
11705 if (type != error_mark_node)
11707 if (deprecated_state != DEPRECATED_SUPPRESS)
11709 tree deptype = type_is_deprecated (type);
11711 warn_deprecated_use (deptype, NULL_TREE);
11714 /* Top-level qualifiers on the parameters are
11715 ignored for function types. */
11716 type = cp_build_qualified_type (type, 0);
11717 if (TREE_CODE (type) == METHOD_TYPE)
11719 error ("parameter %qD invalidly declared method type", decl);
11720 type = build_pointer_type (type);
11721 TREE_TYPE (decl) = type;
11723 else if (abstract_virtuals_error (decl, type))
11724 any_error = 1; /* Seems like a good idea. */
11725 else if (POINTER_TYPE_P (type))
11727 /* [dcl.fct]/6, parameter types cannot contain pointers
11728 (references) to arrays of unknown bound. */
11729 tree t = TREE_TYPE (type);
11730 int ptr = TYPE_PTR_P (type);
11734 if (TYPE_PTR_P (t))
11736 else if (TREE_CODE (t) != ARRAY_TYPE)
11738 else if (!TYPE_DOMAIN (t))
11742 if (TREE_CODE (t) == ARRAY_TYPE)
11744 ? G_("parameter %qD includes pointer to array of "
11745 "unknown bound %qT")
11746 : G_("parameter %qD includes reference to array of "
11747 "unknown bound %qT"),
11753 else if (init && !processing_template_decl)
11754 init = check_default_argument (decl, init, tf_warning_or_error);
11757 DECL_CHAIN (decl) = decls;
11759 result = tree_cons (init, type, result);
11761 decls = nreverse (decls);
11762 result = nreverse (result);
11764 result = chainon (result, void_list_node);
11771 /* D is a constructor or overloaded `operator='.
11773 Let T be the class in which D is declared. Then, this function
11776 -1 if D's is an ill-formed constructor or copy assignment operator
11777 whose first parameter is of type `T'.
11778 0 if D is not a copy constructor or copy assignment
11780 1 if D is a copy constructor or copy assignment operator whose
11781 first parameter is a reference to non-const qualified T.
11782 2 if D is a copy constructor or copy assignment operator whose
11783 first parameter is a reference to const qualified T.
11785 This function can be used as a predicate. Positive values indicate
11786 a copy constructor and nonzero values indicate a copy assignment
11790 copy_fn_p (const_tree d)
11796 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
11798 if (TREE_CODE (d) == TEMPLATE_DECL
11799 || (DECL_TEMPLATE_INFO (d)
11800 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
11801 /* Instantiations of template member functions are never copy
11802 functions. Note that member functions of templated classes are
11803 represented as template functions internally, and we must
11804 accept those as copy functions. */
11807 args = FUNCTION_FIRST_USER_PARMTYPE (d);
11811 arg_type = TREE_VALUE (args);
11812 if (arg_type == error_mark_node)
11815 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
11817 /* Pass by value copy assignment operator. */
11820 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
11821 && !TYPE_REF_IS_RVALUE (arg_type)
11822 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
11824 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
11830 args = TREE_CHAIN (args);
11832 if (args && args != void_list_node && !TREE_PURPOSE (args))
11833 /* There are more non-optional args. */
11839 /* D is a constructor or overloaded `operator='.
11841 Let T be the class in which D is declared. Then, this function
11842 returns true when D is a move constructor or move assignment
11843 operator, false otherwise. */
11846 move_fn_p (const_tree d)
11848 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
11850 if (cxx_dialect == cxx98)
11851 /* There are no move constructors if we are in C++98 mode. */
11854 if (TREE_CODE (d) == TEMPLATE_DECL
11855 || (DECL_TEMPLATE_INFO (d)
11856 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
11857 /* Instantiations of template member functions are never move
11858 functions. Note that member functions of templated classes are
11859 represented as template functions internally, and we must
11860 accept those as move functions. */
11863 return move_signature_fn_p (d);
11866 /* D is a constructor or overloaded `operator='.
11868 Then, this function returns true when D has the same signature as a move
11869 constructor or move assignment operator (because either it is such a
11870 ctor/op= or it is a template specialization with the same signature),
11871 false otherwise. */
11874 move_signature_fn_p (const_tree d)
11878 bool result = false;
11880 args = FUNCTION_FIRST_USER_PARMTYPE (d);
11884 arg_type = TREE_VALUE (args);
11885 if (arg_type == error_mark_node)
11888 if (TREE_CODE (arg_type) == REFERENCE_TYPE
11889 && TYPE_REF_IS_RVALUE (arg_type)
11890 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
11894 args = TREE_CHAIN (args);
11896 if (args && args != void_list_node && !TREE_PURPOSE (args))
11897 /* There are more non-optional args. */
11903 /* Remember any special properties of member function DECL. */
11906 grok_special_member_properties (tree decl)
11910 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
11913 class_type = DECL_CONTEXT (decl);
11914 if (DECL_CONSTRUCTOR_P (decl))
11916 int ctor = copy_fn_p (decl);
11918 if (!DECL_ARTIFICIAL (decl))
11919 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
11925 A non-template constructor for class X is a copy
11926 constructor if its first parameter is of type X&, const
11927 X&, volatile X& or const volatile X&, and either there
11928 are no other parameters or else all other parameters have
11929 default arguments. */
11930 TYPE_HAS_COPY_CTOR (class_type) = 1;
11931 if (user_provided_p (decl))
11932 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
11934 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
11936 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
11937 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
11938 else if (move_fn_p (decl) && user_provided_p (decl))
11939 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
11940 else if (is_list_ctor (decl))
11941 TYPE_HAS_LIST_CTOR (class_type) = 1;
11943 if (DECL_DECLARED_CONSTEXPR_P (decl)
11944 && !copy_fn_p (decl) && !move_fn_p (decl))
11945 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
11947 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
11951 A non-template assignment operator for class X is a copy
11952 assignment operator if its parameter is of type X, X&, const
11953 X&, volatile X& or const volatile X&. */
11955 int assop = copy_fn_p (decl);
11959 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
11960 if (user_provided_p (decl))
11961 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
11963 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
11965 else if (move_fn_p (decl) && user_provided_p (decl))
11966 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
11968 /* Destructors are handled in check_methods. */
11971 /* Check a constructor DECL has the correct form. Complains
11972 if the class has a constructor of the form X(X). */
11975 grok_ctor_properties (const_tree ctype, const_tree decl)
11977 int ctor_parm = copy_fn_p (decl);
11983 A declaration of a constructor for a class X is ill-formed if
11984 its first parameter is of type (optionally cv-qualified) X
11985 and either there are no other parameters or else all other
11986 parameters have default arguments.
11988 We *don't* complain about member template instantiations that
11989 have this form, though; they can occur as we try to decide
11990 what constructor to use during overload resolution. Since
11991 overload resolution will never prefer such a constructor to
11992 the non-template copy constructor (which is either explicitly
11993 or implicitly defined), there's no need to worry about their
11994 existence. Theoretically, they should never even be
11995 instantiated, but that's hard to forestall. */
11996 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
12004 /* An operator with this code is unary, but can also be binary. */
12007 ambi_op_p (enum tree_code code)
12009 return (code == INDIRECT_REF
12010 || code == ADDR_EXPR
12011 || code == UNARY_PLUS_EXPR
12012 || code == NEGATE_EXPR
12013 || code == PREINCREMENT_EXPR
12014 || code == PREDECREMENT_EXPR);
12017 /* An operator with this name can only be unary. */
12020 unary_op_p (enum tree_code code)
12022 return (code == TRUTH_NOT_EXPR
12023 || code == BIT_NOT_EXPR
12024 || code == COMPONENT_REF
12025 || code == TYPE_EXPR);
12028 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
12029 errors are issued for invalid declarations. */
12032 grok_op_properties (tree decl, bool complain)
12034 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
12036 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
12037 tree name = DECL_NAME (decl);
12038 enum tree_code operator_code;
12043 /* Count the number of arguments and check for ellipsis. */
12044 for (argtype = argtypes, arity = 0;
12045 argtype && argtype != void_list_node;
12046 argtype = TREE_CHAIN (argtype))
12048 ellipsis_p = !argtype;
12050 class_type = DECL_CONTEXT (decl);
12051 if (class_type && !CLASS_TYPE_P (class_type))
12052 class_type = NULL_TREE;
12054 if (DECL_CONV_FN_P (decl))
12055 operator_code = TYPE_EXPR;
12059 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
12060 if (ansi_opname (CODE) == name) \
12062 operator_code = (CODE); \
12065 else if (ansi_assopname (CODE) == name) \
12067 operator_code = (CODE); \
12068 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
12072 #include "operators.def"
12073 #undef DEF_OPERATOR
12075 gcc_unreachable ();
12078 gcc_assert (operator_code != MAX_TREE_CODES);
12079 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
12082 switch (operator_code)
12085 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
12089 TYPE_GETS_DELETE (class_type) |= 1;
12093 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
12096 case VEC_DELETE_EXPR:
12097 TYPE_GETS_DELETE (class_type) |= 2;
12104 /* [basic.std.dynamic.allocation]/1:
12106 A program is ill-formed if an allocation function is declared
12107 in a namespace scope other than global scope or declared static
12110 The same also holds true for deallocation functions. */
12111 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
12112 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
12114 if (DECL_NAMESPACE_SCOPE_P (decl))
12116 if (CP_DECL_CONTEXT (decl) != global_namespace)
12118 error ("%qD may not be declared within a namespace", decl);
12121 else if (!TREE_PUBLIC (decl))
12123 error ("%qD may not be declared as static", decl);
12129 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
12131 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
12132 DECL_IS_OPERATOR_NEW (decl) = 1;
12134 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
12135 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
12138 /* An operator function must either be a non-static member function
12139 or have at least one parameter of a class, a reference to a class,
12140 an enumeration, or a reference to an enumeration. 13.4.0.6 */
12141 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
12143 if (operator_code == TYPE_EXPR
12144 || operator_code == CALL_EXPR
12145 || operator_code == COMPONENT_REF
12146 || operator_code == ARRAY_REF
12147 || operator_code == NOP_EXPR)
12149 error ("%qD must be a nonstatic member function", decl);
12156 if (DECL_STATIC_FUNCTION_P (decl))
12158 error ("%qD must be either a non-static member "
12159 "function or a non-member function", decl);
12163 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
12165 tree arg = non_reference (TREE_VALUE (p));
12166 if (arg == error_mark_node)
12169 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
12170 because these checks are performed even on
12171 template functions. */
12172 if (MAYBE_CLASS_TYPE_P (arg)
12173 || TREE_CODE (arg) == ENUMERAL_TYPE)
12177 if (!p || p == void_list_node)
12180 error ("%qD must have an argument of class or "
12181 "enumerated type", decl);
12187 /* There are no restrictions on the arguments to an overloaded
12189 if (operator_code == CALL_EXPR)
12192 /* Warn about conversion operators that will never be used. */
12193 if (IDENTIFIER_TYPENAME_P (name)
12194 && ! DECL_TEMPLATE_INFO (decl)
12196 /* Warn only declaring the function; there is no need to
12197 warn again about out-of-class definitions. */
12198 && class_type == current_class_type)
12200 tree t = TREE_TYPE (name);
12201 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
12204 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
12206 if (VOID_TYPE_P (t))
12207 warning (OPT_Wconversion,
12209 ? G_("conversion to a reference to void "
12210 "will never use a type conversion operator")
12211 : G_("conversion to void "
12212 "will never use a type conversion operator"));
12213 else if (class_type)
12215 if (t == class_type)
12216 warning (OPT_Wconversion,
12218 ? G_("conversion to a reference to the same type "
12219 "will never use a type conversion operator")
12220 : G_("conversion to the same type "
12221 "will never use a type conversion operator"));
12222 /* Don't force t to be complete here. */
12223 else if (MAYBE_CLASS_TYPE_P (t)
12224 && COMPLETE_TYPE_P (t)
12225 && DERIVED_FROM_P (t, class_type))
12226 warning (OPT_Wconversion,
12228 ? G_("conversion to a reference to a base class "
12229 "will never use a type conversion operator")
12230 : G_("conversion to a base class "
12231 "will never use a type conversion operator"));
12236 if (operator_code == COND_EXPR)
12239 error ("ISO C++ prohibits overloading operator ?:");
12242 else if (ellipsis_p)
12244 error ("%qD must not have variable number of arguments", decl);
12247 else if (ambi_op_p (operator_code))
12250 /* We pick the one-argument operator codes by default, so
12251 we don't have to change anything. */
12253 else if (arity == 2)
12255 /* If we thought this was a unary operator, we now know
12256 it to be a binary operator. */
12257 switch (operator_code)
12260 operator_code = MULT_EXPR;
12264 operator_code = BIT_AND_EXPR;
12267 case UNARY_PLUS_EXPR:
12268 operator_code = PLUS_EXPR;
12272 operator_code = MINUS_EXPR;
12275 case PREINCREMENT_EXPR:
12276 operator_code = POSTINCREMENT_EXPR;
12279 case PREDECREMENT_EXPR:
12280 operator_code = POSTDECREMENT_EXPR;
12284 gcc_unreachable ();
12287 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
12289 if ((operator_code == POSTINCREMENT_EXPR
12290 || operator_code == POSTDECREMENT_EXPR)
12291 && ! processing_template_decl
12292 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
12295 error ("postfix %qD must take %<int%> as its argument",
12298 error ("postfix %qD must take %<int%> as its second "
12306 error ("%qD must take either zero or one argument", decl);
12308 error ("%qD must take either one or two arguments", decl);
12312 /* More Effective C++ rule 6. */
12314 && (operator_code == POSTINCREMENT_EXPR
12315 || operator_code == POSTDECREMENT_EXPR
12316 || operator_code == PREINCREMENT_EXPR
12317 || operator_code == PREDECREMENT_EXPR))
12319 tree arg = TREE_VALUE (argtypes);
12320 tree ret = TREE_TYPE (TREE_TYPE (decl));
12321 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
12322 arg = TREE_TYPE (arg);
12323 arg = TYPE_MAIN_VARIANT (arg);
12324 if (operator_code == PREINCREMENT_EXPR
12325 || operator_code == PREDECREMENT_EXPR)
12327 if (TREE_CODE (ret) != REFERENCE_TYPE
12328 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
12330 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
12331 build_reference_type (arg));
12335 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
12336 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
12340 else if (unary_op_p (operator_code))
12345 error ("%qD must take %<void%>", decl);
12347 error ("%qD must take exactly one argument", decl);
12351 else /* if (binary_op_p (operator_code)) */
12356 error ("%qD must take exactly one argument", decl);
12358 error ("%qD must take exactly two arguments", decl);
12362 /* More Effective C++ rule 7. */
12364 && (operator_code == TRUTH_ANDIF_EXPR
12365 || operator_code == TRUTH_ORIF_EXPR
12366 || operator_code == COMPOUND_EXPR))
12367 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
12371 /* Effective C++ rule 23. */
12374 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
12375 && (operator_code == PLUS_EXPR
12376 || operator_code == MINUS_EXPR
12377 || operator_code == TRUNC_DIV_EXPR
12378 || operator_code == MULT_EXPR
12379 || operator_code == TRUNC_MOD_EXPR)
12380 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
12381 warning (OPT_Weffc__, "%qD should return by value", decl);
12383 /* [over.oper]/8 */
12384 for (; argtypes && argtypes != void_list_node;
12385 argtypes = TREE_CHAIN (argtypes))
12386 if (TREE_PURPOSE (argtypes))
12388 TREE_PURPOSE (argtypes) = NULL_TREE;
12389 if (operator_code == POSTINCREMENT_EXPR
12390 || operator_code == POSTDECREMENT_EXPR)
12392 pedwarn (input_location, OPT_Wpedantic, "%qD cannot have default arguments",
12397 error ("%qD cannot have default arguments", decl);
12405 /* Return a string giving the keyword associate with CODE. */
12407 static const char *
12408 tag_name (enum tag_types code)
12420 case typename_type:
12423 gcc_unreachable ();
12427 /* Name lookup in an elaborated-type-specifier (after the keyword
12428 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
12429 elaborated-type-specifier is invalid, issue a diagnostic and return
12430 error_mark_node; otherwise, return the *_TYPE to which it referred.
12431 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
12434 check_elaborated_type_specifier (enum tag_types tag_code,
12436 bool allow_template_p)
12442 struct S { struct S *p; };
12444 name lookup will find the TYPE_DECL for the implicit "S::S"
12445 typedef. Adjust for that here. */
12446 if (DECL_SELF_REFERENCE_P (decl))
12447 decl = TYPE_NAME (TREE_TYPE (decl));
12449 type = TREE_TYPE (decl);
12451 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
12452 is false for this case as well. */
12453 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
12455 error ("using template type parameter %qT after %qs",
12456 type, tag_name (tag_code));
12457 return error_mark_node;
12459 /* Accept template template parameters. */
12460 else if (allow_template_p
12461 && (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM
12462 || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM))
12466 If the identifier resolves to a typedef-name or the
12467 simple-template-id resolves to an alias template
12468 specialization, the elaborated-type-specifier is ill-formed.
12470 In other words, the only legitimate declaration to use in the
12471 elaborated type specifier is the implicit typedef created when
12472 the type is declared. */
12473 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
12474 && !DECL_SELF_REFERENCE_P (decl)
12475 && tag_code != typename_type)
12477 if (alias_template_specialization_p (type))
12478 error ("using alias template specialization %qT after %qs",
12479 type, tag_name (tag_code));
12481 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
12482 inform (DECL_SOURCE_LOCATION (decl),
12483 "%qD has a previous declaration here", decl);
12484 return error_mark_node;
12486 else if (TREE_CODE (type) != RECORD_TYPE
12487 && TREE_CODE (type) != UNION_TYPE
12488 && tag_code != enum_type
12489 && tag_code != typename_type)
12491 error ("%qT referred to as %qs", type, tag_name (tag_code));
12492 inform (input_location, "%q+T has a previous declaration here", type);
12493 return error_mark_node;
12495 else if (TREE_CODE (type) != ENUMERAL_TYPE
12496 && tag_code == enum_type)
12498 error ("%qT referred to as enum", type);
12499 inform (input_location, "%q+T has a previous declaration here", type);
12500 return error_mark_node;
12502 else if (!allow_template_p
12503 && TREE_CODE (type) == RECORD_TYPE
12504 && CLASSTYPE_IS_TEMPLATE (type))
12506 /* If a class template appears as elaborated type specifier
12507 without a template header such as:
12509 template <class T> class C {};
12510 void f(class C); // No template header here
12512 then the required template argument is missing. */
12513 error ("template argument required for %<%s %T%>",
12514 tag_name (tag_code),
12515 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
12516 return error_mark_node;
12522 /* Lookup NAME in elaborate type specifier in scope according to
12523 SCOPE and issue diagnostics if necessary.
12524 Return *_TYPE node upon success, NULL_TREE when the NAME is not
12525 found, and ERROR_MARK_NODE for type error. */
12528 lookup_and_check_tag (enum tag_types tag_code, tree name,
12529 tag_scope scope, bool template_header_p)
12533 if (scope == ts_global)
12535 /* First try ordinary name lookup, ignoring hidden class name
12536 injected via friend declaration. */
12537 decl = lookup_name_prefer_type (name, 2);
12538 decl = strip_using_decl (decl);
12539 /* If that fails, the name will be placed in the smallest
12540 non-class, non-function-prototype scope according to 3.3.1/5.
12541 We may already have a hidden name declared as friend in this
12542 scope. So lookup again but not ignoring hidden names.
12543 If we find one, that name will be made visible rather than
12544 creating a new tag. */
12546 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
12549 decl = lookup_type_scope (name, scope);
12552 && (DECL_CLASS_TEMPLATE_P (decl)
12553 /* If scope is ts_current we're defining a class, so ignore a
12554 template template parameter. */
12555 || (scope != ts_current
12556 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl))))
12557 decl = DECL_TEMPLATE_RESULT (decl);
12559 if (decl && TREE_CODE (decl) == TYPE_DECL)
12561 /* Look for invalid nested type:
12565 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
12567 error ("%qD has the same name as the class in which it is "
12570 return error_mark_node;
12573 /* Two cases we need to consider when deciding if a class
12574 template is allowed as an elaborated type specifier:
12575 1. It is a self reference to its own class.
12576 2. It comes with a template header.
12580 template <class T> class C {
12581 class C *c1; // DECL_SELF_REFERENCE_P is true
12584 template <class U> class C; // template_header_p is true
12585 template <class T> class C<T>::D {
12586 class C *c2; // DECL_SELF_REFERENCE_P is true
12589 t = check_elaborated_type_specifier (tag_code,
12592 | DECL_SELF_REFERENCE_P (decl));
12593 if (template_header_p && t && CLASS_TYPE_P (t)
12594 && (!CLASSTYPE_TEMPLATE_INFO (t)
12595 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))))
12597 error ("%qT is not a template", t);
12598 inform (location_of (t), "previous declaration here");
12599 if (TYPE_CLASS_SCOPE_P (t)
12600 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t)))
12601 inform (input_location,
12602 "perhaps you want to explicitly add %<%T::%>",
12604 t = error_mark_node;
12609 else if (decl && TREE_CODE (decl) == TREE_LIST)
12611 error ("reference to %qD is ambiguous", name);
12612 print_candidates (decl);
12613 return error_mark_node;
12619 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
12620 Define the tag as a forward-reference if it is not defined.
12622 If a declaration is given, process it here, and report an error if
12623 multiple declarations are not identical.
12625 SCOPE is TS_CURRENT when this is also a definition. Only look in
12626 the current frame for the name (since C++ allows new names in any
12627 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
12628 declaration. Only look beginning from the current scope outward up
12629 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
12631 TEMPLATE_HEADER_P is true when this declaration is preceded by
12632 a set of template parameters. */
12635 xref_tag_1 (enum tag_types tag_code, tree name,
12636 tag_scope orig_scope, bool template_header_p)
12638 enum tree_code code;
12640 tree context = NULL_TREE;
12643 gcc_assert (identifier_p (name));
12649 code = RECORD_TYPE;
12655 code = ENUMERAL_TYPE;
12658 gcc_unreachable ();
12661 if (orig_scope == ts_lambda)
12662 scope = ts_current;
12664 scope = orig_scope;
12666 /* In case of anonymous name, xref_tag is only called to
12667 make type node and push name. Name lookup is not required. */
12668 if (anon_aggrname_p (name))
12671 t = lookup_and_check_tag (tag_code, name,
12672 scope, template_header_p);
12674 if (t == error_mark_node)
12675 return error_mark_node;
12677 if (scope != ts_current && t && current_class_type
12678 && template_class_depth (current_class_type)
12679 && template_header_p)
12681 if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM)
12684 /* Since SCOPE is not TS_CURRENT, we are not looking at a
12685 definition of this tag. Since, in addition, we are currently
12686 processing a (member) template declaration of a template
12687 class, we must be very careful; consider:
12694 { template <class V>
12695 friend struct S1; };
12697 Here, the S2::S1 declaration should not be confused with the
12698 outer declaration. In particular, the inner version should
12699 have a template parameter of level 2, not level 1. This
12700 would be particularly important if the member declaration
12703 template <class V = U> friend struct S1;
12705 say, when we should tsubst into `U' when instantiating
12706 S2. On the other hand, when presented with:
12716 we must find the inner binding eventually. We
12717 accomplish this by making sure that the new type we
12718 create to represent this declaration has the right
12720 context = TYPE_CONTEXT (t);
12726 /* If no such tag is yet defined, create a forward-reference node
12727 and record it as the "definition".
12728 When a real declaration of this type is found,
12729 the forward-reference will be altered into a real type. */
12730 if (code == ENUMERAL_TYPE)
12732 error ("use of enum %q#D without previous declaration", name);
12733 return error_mark_node;
12737 t = make_class_type (code);
12738 TYPE_CONTEXT (t) = context;
12739 if (orig_scope == ts_lambda)
12740 /* Remember that we're declaring a lambda to avoid bogus errors
12741 in push_template_decl. */
12742 CLASSTYPE_LAMBDA_EXPR (t) = error_mark_node;
12743 t = pushtag (name, t, scope);
12748 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
12750 /* Check that we aren't trying to overload a class with different
12752 tree constr = NULL_TREE;
12753 if (current_template_parms)
12755 tree reqs = TEMPLATE_PARMS_CONSTRAINTS (current_template_parms);
12756 constr = build_constraints (reqs, NULL_TREE);
12758 if (!redeclare_class_template (t, current_template_parms, constr))
12759 return error_mark_node;
12761 else if (!processing_template_decl
12762 && CLASS_TYPE_P (t)
12763 && CLASSTYPE_IS_TEMPLATE (t))
12765 error ("redeclaration of %qT as a non-template", t);
12766 error ("previous declaration %q+D", t);
12767 return error_mark_node;
12770 /* Make injected friend class visible. */
12771 if (scope != ts_within_enclosing_non_class
12772 && hidden_name_p (TYPE_NAME (t)))
12774 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
12775 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
12777 if (TYPE_TEMPLATE_INFO (t))
12779 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
12780 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
12788 /* Wrapper for xref_tag_1. */
12791 xref_tag (enum tag_types tag_code, tree name,
12792 tag_scope scope, bool template_header_p)
12796 subtime = timevar_cond_start (TV_NAME_LOOKUP);
12797 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
12798 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
12804 xref_tag_from_type (tree old, tree id, tag_scope scope)
12806 enum tag_types tag_kind;
12808 if (TREE_CODE (old) == RECORD_TYPE)
12809 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
12811 tag_kind = union_type;
12813 if (id == NULL_TREE)
12814 id = TYPE_IDENTIFIER (old);
12816 return xref_tag (tag_kind, id, scope, false);
12819 /* Create the binfo hierarchy for REF with (possibly NULL) base list
12820 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
12821 access_* node, and the TREE_VALUE is the type of the base-class.
12822 Non-NULL TREE_TYPE indicates virtual inheritance.
12824 Returns true if the binfo hierarchy was successfully created,
12825 false if an error was detected. */
12828 xref_basetypes (tree ref, tree base_list)
12831 tree binfo, base_binfo;
12832 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
12833 unsigned max_bases = 0; /* Maximum direct bases. */
12834 unsigned max_dvbases = 0; /* Maximum direct virtual bases. */
12836 tree default_access;
12837 tree igo_prev; /* Track Inheritance Graph Order. */
12839 if (ref == error_mark_node)
12842 /* The base of a derived class is private by default, all others are
12844 default_access = (TREE_CODE (ref) == RECORD_TYPE
12845 && CLASSTYPE_DECLARED_CLASS (ref)
12846 ? access_private_node : access_public_node);
12848 /* First, make sure that any templates in base-classes are
12849 instantiated. This ensures that if we call ourselves recursively
12850 we do not get confused about which classes are marked and which
12852 basep = &base_list;
12855 tree basetype = TREE_VALUE (*basep);
12857 /* The dependent_type_p call below should really be dependent_scope_p
12858 so that we give a hard error about using an incomplete type as a
12859 base, but we allow it with a pedwarn for backward
12861 if (processing_template_decl
12862 && CLASS_TYPE_P (basetype) && TYPE_BEING_DEFINED (basetype))
12863 cxx_incomplete_type_diagnostic (NULL_TREE, basetype, DK_PEDWARN);
12864 if (!dependent_type_p (basetype)
12865 && !complete_type_or_else (basetype, NULL))
12866 /* An incomplete type. Remove it from the list. */
12867 *basep = TREE_CHAIN (*basep);
12871 if (TREE_TYPE (*basep))
12873 if (CLASS_TYPE_P (basetype))
12874 max_vbases += vec_safe_length (CLASSTYPE_VBASECLASSES (basetype));
12875 basep = &TREE_CHAIN (*basep);
12878 max_vbases += max_dvbases;
12880 TYPE_MARKED_P (ref) = 1;
12882 /* The binfo slot should be empty, unless this is an (ill-formed)
12884 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
12886 error ("redefinition of %q#T", ref);
12890 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
12892 binfo = make_tree_binfo (max_bases);
12894 TYPE_BINFO (ref) = binfo;
12895 BINFO_OFFSET (binfo) = size_zero_node;
12896 BINFO_TYPE (binfo) = ref;
12898 /* Apply base-class info set up to the variants of this type. */
12899 fixup_type_variants (ref);
12903 vec_alloc (BINFO_BASE_ACCESSES (binfo), max_bases);
12904 /* An aggregate cannot have baseclasses. */
12905 CLASSTYPE_NON_AGGREGATE (ref) = 1;
12907 if (TREE_CODE (ref) == UNION_TYPE)
12909 error ("derived union %qT invalid", ref);
12916 if (TYPE_FOR_JAVA (ref))
12918 error ("Java class %qT cannot have multiple bases", ref);
12922 warning (OPT_Wmultiple_inheritance,
12923 "%qT defined with multiple direct bases", ref);
12928 vec_alloc (CLASSTYPE_VBASECLASSES (ref), max_vbases);
12930 if (TYPE_FOR_JAVA (ref))
12932 error ("Java class %qT cannot have virtual bases", ref);
12935 else if (max_dvbases)
12936 warning (OPT_Wvirtual_inheritance,
12937 "%qT defined with direct virtual base", ref);
12940 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
12942 tree access = TREE_PURPOSE (base_list);
12943 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
12944 tree basetype = TREE_VALUE (base_list);
12946 if (access == access_default_node)
12947 access = default_access;
12949 if (PACK_EXPANSION_P (basetype))
12950 basetype = PACK_EXPANSION_PATTERN (basetype);
12951 if (TREE_CODE (basetype) == TYPE_DECL)
12952 basetype = TREE_TYPE (basetype);
12953 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
12955 error ("base type %qT fails to be a struct or class type",
12960 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
12961 TYPE_FOR_JAVA (ref) = 1;
12963 base_binfo = NULL_TREE;
12964 if (CLASS_TYPE_P (basetype) && !dependent_scope_p (basetype))
12966 base_binfo = TYPE_BINFO (basetype);
12967 /* The original basetype could have been a typedef'd type. */
12968 basetype = BINFO_TYPE (base_binfo);
12970 /* Inherit flags from the base. */
12971 TYPE_HAS_NEW_OPERATOR (ref)
12972 |= TYPE_HAS_NEW_OPERATOR (basetype);
12973 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
12974 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
12975 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
12976 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
12977 CLASSTYPE_DIAMOND_SHAPED_P (ref)
12978 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
12979 CLASSTYPE_REPEATED_BASE_P (ref)
12980 |= CLASSTYPE_REPEATED_BASE_P (basetype);
12983 /* We must do this test after we've seen through a typedef
12985 if (TYPE_MARKED_P (basetype))
12987 if (basetype == ref)
12988 error ("recursive type %qT undefined", basetype);
12990 error ("duplicate base type %qT invalid", basetype);
12994 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
12995 /* Regenerate the pack expansion for the bases. */
12996 basetype = make_pack_expansion (basetype);
12998 TYPE_MARKED_P (basetype) = 1;
13000 base_binfo = copy_binfo (base_binfo, basetype, ref,
13001 &igo_prev, via_virtual);
13002 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
13003 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
13005 BINFO_BASE_APPEND (binfo, base_binfo);
13006 BINFO_BASE_ACCESS_APPEND (binfo, access);
13009 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref)) < max_vbases)
13010 /* If we didn't get max_vbases vbases, we must have shared at
13011 least one of them, and are therefore diamond shaped. */
13012 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
13014 /* Unmark all the types. */
13015 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
13016 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
13017 TYPE_MARKED_P (ref) = 0;
13019 /* Now see if we have a repeated base type. */
13020 if (!CLASSTYPE_REPEATED_BASE_P (ref))
13022 for (base_binfo = binfo; base_binfo;
13023 base_binfo = TREE_CHAIN (base_binfo))
13025 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
13027 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
13030 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
13032 for (base_binfo = binfo; base_binfo;
13033 base_binfo = TREE_CHAIN (base_binfo))
13034 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
13035 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
13044 /* Copies the enum-related properties from type SRC to type DST.
13045 Used with the underlying type of an enum and the enum itself. */
13047 copy_type_enum (tree dst, tree src)
13050 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
13052 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
13053 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
13054 TYPE_SIZE (t) = TYPE_SIZE (src);
13055 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
13056 SET_TYPE_MODE (dst, TYPE_MODE (src));
13057 TYPE_PRECISION (t) = TYPE_PRECISION (src);
13058 unsigned valign = TYPE_ALIGN (src);
13059 if (TYPE_USER_ALIGN (t))
13060 valign = MAX (valign, TYPE_ALIGN (t));
13062 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
13063 TYPE_ALIGN (t) = valign;
13064 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
13068 /* Begin compiling the definition of an enumeration type.
13071 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
13073 UNDERLYING_TYPE is the type that will be used as the storage for
13074 the enumeration type. This should be NULL_TREE if no storage type
13077 ATTRIBUTES are any attributes specified after the enum-key.
13079 SCOPED_ENUM_P is true if this is a scoped enumeration type.
13081 if IS_NEW is not NULL, gets TRUE iff a new type is created.
13083 Returns the type object, as yet incomplete.
13084 Also records info about it so that build_enumerator
13085 may be used to declare the individual values as they are read. */
13088 start_enum (tree name, tree enumtype, tree underlying_type,
13089 tree attributes, bool scoped_enum_p, bool *is_new)
13091 tree prevtype = NULL_TREE;
13092 gcc_assert (identifier_p (name));
13096 /* [C++0x dcl.enum]p5:
13098 If not explicitly specified, the underlying type of a scoped
13099 enumeration type is int. */
13100 if (!underlying_type && scoped_enum_p)
13101 underlying_type = integer_type_node;
13103 if (underlying_type)
13104 underlying_type = cv_unqualified (underlying_type);
13106 /* If this is the real definition for a previous forward reference,
13107 fill in the contents in the same object that used to be the
13108 forward reference. */
13110 enumtype = lookup_and_check_tag (enum_type, name,
13111 /*tag_scope=*/ts_current,
13112 /*template_header_p=*/false);
13114 /* In case of a template_decl, the only check that should be deferred
13115 to instantiation time is the comparison of underlying types. */
13116 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
13118 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
13120 error_at (input_location, "scoped/unscoped mismatch "
13121 "in enum %q#T", enumtype);
13122 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
13123 "previous definition here");
13124 enumtype = error_mark_node;
13126 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
13128 error_at (input_location, "underlying type mismatch "
13129 "in enum %q#T", enumtype);
13130 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
13131 "previous definition here");
13132 enumtype = error_mark_node;
13134 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
13135 && !dependent_type_p (underlying_type)
13136 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
13137 && !same_type_p (underlying_type,
13138 ENUM_UNDERLYING_TYPE (enumtype)))
13140 error_at (input_location, "different underlying type "
13141 "in enum %q#T", enumtype);
13142 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
13143 "previous definition here");
13144 underlying_type = NULL_TREE;
13148 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
13149 || processing_template_decl)
13151 /* In case of error, make a dummy enum to allow parsing to
13153 if (enumtype == error_mark_node)
13155 name = make_anon_name ();
13156 enumtype = NULL_TREE;
13159 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
13160 of an opaque enum, or an opaque enum of an already defined
13161 enumeration (C++0x only).
13162 In any other case, it'll be NULL_TREE. */
13168 prevtype = enumtype;
13170 /* Do not push the decl more than once, unless we need to
13171 compare underlying types at instantiation time */
13173 || TREE_CODE (enumtype) != ENUMERAL_TYPE
13174 || (underlying_type
13175 && dependent_type_p (underlying_type))
13176 || (ENUM_UNDERLYING_TYPE (enumtype)
13177 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
13179 enumtype = cxx_make_type (ENUMERAL_TYPE);
13180 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
13183 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
13186 if (enumtype == error_mark_node)
13187 return error_mark_node;
13189 /* The enum is considered opaque until the opening '{' of the
13190 enumerator list. */
13191 SET_OPAQUE_ENUM_P (enumtype, true);
13192 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
13195 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
13197 cplus_decl_attributes (&enumtype, attributes, (int)ATTR_FLAG_TYPE_IN_PLACE);
13199 if (underlying_type)
13201 if (CP_INTEGRAL_TYPE_P (underlying_type))
13203 copy_type_enum (enumtype, underlying_type);
13204 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
13206 else if (dependent_type_p (underlying_type))
13207 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
13209 error ("underlying type %<%T%> of %<%T%> must be an integral type",
13210 underlying_type, enumtype);
13213 /* If into a template class, the returned enum is always the first
13214 declaration (opaque or not) seen. This way all the references to
13215 this type will be to the same declaration. The following ones are used
13216 only to check for definition errors. */
13217 if (prevtype && processing_template_decl)
13223 /* After processing and defining all the values of an enumeration type,
13224 install their decls in the enumeration type.
13225 ENUMTYPE is the type object. */
13228 finish_enum_value_list (tree enumtype)
13231 tree underlying_type;
13234 tree minnode, maxnode;
13237 bool fixed_underlying_type_p
13238 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
13240 /* We built up the VALUES in reverse order. */
13241 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
13243 /* For an enum defined in a template, just set the type of the values;
13244 all further processing is postponed until the template is
13245 instantiated. We need to set the type so that tsubst of a CONST_DECL
13247 if (processing_template_decl)
13249 for (values = TYPE_VALUES (enumtype);
13251 values = TREE_CHAIN (values))
13252 TREE_TYPE (TREE_VALUE (values)) = enumtype;
13256 /* Determine the minimum and maximum values of the enumerators. */
13257 if (TYPE_VALUES (enumtype))
13259 minnode = maxnode = NULL_TREE;
13261 for (values = TYPE_VALUES (enumtype);
13263 values = TREE_CHAIN (values))
13265 decl = TREE_VALUE (values);
13267 /* [dcl.enum]: Following the closing brace of an enum-specifier,
13268 each enumerator has the type of its enumeration. Prior to the
13269 closing brace, the type of each enumerator is the type of its
13270 initializing value. */
13271 TREE_TYPE (decl) = enumtype;
13273 /* Update the minimum and maximum values, if appropriate. */
13274 value = DECL_INITIAL (decl);
13275 if (value == error_mark_node)
13276 value = integer_zero_node;
13277 /* Figure out what the minimum and maximum values of the
13278 enumerators are. */
13280 minnode = maxnode = value;
13281 else if (tree_int_cst_lt (maxnode, value))
13283 else if (tree_int_cst_lt (value, minnode))
13290 If the enumerator-list is empty, the underlying type is as if
13291 the enumeration had a single enumerator with value 0. */
13292 minnode = maxnode = integer_zero_node;
13294 if (!fixed_underlying_type_p)
13296 /* Compute the number of bits require to represent all values of the
13297 enumeration. We must do this before the type of MINNODE and
13298 MAXNODE are transformed, since tree_int_cst_min_precision relies
13299 on the TREE_TYPE of the value it is passed. */
13300 signop sgn = tree_int_cst_sgn (minnode) >= 0 ? UNSIGNED : SIGNED;
13301 int lowprec = tree_int_cst_min_precision (minnode, sgn);
13302 int highprec = tree_int_cst_min_precision (maxnode, sgn);
13303 int precision = MAX (lowprec, highprec);
13305 bool use_short_enum;
13307 /* Determine the underlying type of the enumeration.
13311 The underlying type of an enumeration is an integral type that
13312 can represent all the enumerator values defined in the
13313 enumeration. It is implementation-defined which integral type is
13314 used as the underlying type for an enumeration except that the
13315 underlying type shall not be larger than int unless the value of
13316 an enumerator cannot fit in an int or unsigned int.
13318 We use "int" or an "unsigned int" as the underlying type, even if
13319 a smaller integral type would work, unless the user has
13320 explicitly requested that we use the smallest possible type. The
13321 user can request that for all enumerations with a command line
13322 flag, or for just one enumeration with an attribute. */
13324 use_short_enum = flag_short_enums
13325 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
13327 for (itk = (use_short_enum ? itk_char : itk_int);
13331 underlying_type = integer_types[itk];
13332 if (underlying_type != NULL_TREE
13333 && TYPE_PRECISION (underlying_type) >= precision
13334 && TYPE_SIGN (underlying_type) == sgn)
13337 if (itk == itk_none)
13341 IF no integral type can represent all the enumerator values, the
13342 enumeration is ill-formed. */
13343 error ("no integral type can represent all of the enumerator values "
13344 "for %qT", enumtype);
13345 precision = TYPE_PRECISION (long_long_integer_type_node);
13346 underlying_type = integer_types[itk_unsigned_long_long];
13351 The value of sizeof() applied to an enumeration type, an object
13352 of an enumeration type, or an enumerator, is the value of sizeof()
13353 applied to the underlying type. */
13354 copy_type_enum (enumtype, underlying_type);
13356 /* Compute the minimum and maximum values for the type.
13360 For an enumeration where emin is the smallest enumerator and emax
13361 is the largest, the values of the enumeration are the values of the
13362 underlying type in the range bmin to bmax, where bmin and bmax are,
13363 respectively, the smallest and largest values of the smallest bit-
13364 field that can store emin and emax. */
13366 /* The middle-end currently assumes that types with TYPE_PRECISION
13367 narrower than their underlying type are suitably zero or sign
13368 extended to fill their mode. Similarly, it assumes that the front
13369 end assures that a value of a particular type must be within
13370 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
13372 We used to set these fields based on bmin and bmax, but that led
13373 to invalid assumptions like optimizing away bounds checking. So
13374 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
13375 TYPE_MAX_VALUE to the values for the mode above and only restrict
13376 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
13377 ENUM_UNDERLYING_TYPE (enumtype)
13378 = build_distinct_type_copy (underlying_type);
13379 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
13380 set_min_and_max_values_for_integral_type
13381 (ENUM_UNDERLYING_TYPE (enumtype), precision, sgn);
13383 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
13384 if (flag_strict_enums)
13385 set_min_and_max_values_for_integral_type (enumtype, precision, sgn);
13388 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
13390 /* Convert each of the enumerators to the type of the underlying
13391 type of the enumeration. */
13392 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
13394 location_t saved_location;
13396 decl = TREE_VALUE (values);
13397 saved_location = input_location;
13398 input_location = DECL_SOURCE_LOCATION (decl);
13399 if (fixed_underlying_type_p)
13400 /* If the enumeration type has a fixed underlying type, we
13401 already checked all of the enumerator values. */
13402 value = DECL_INITIAL (decl);
13404 value = perform_implicit_conversion (underlying_type,
13405 DECL_INITIAL (decl),
13406 tf_warning_or_error);
13407 input_location = saved_location;
13409 /* Do not clobber shared ints. */
13410 value = copy_node (value);
13412 TREE_TYPE (value) = enumtype;
13413 DECL_INITIAL (decl) = value;
13416 /* Fix up all variant types of this enum type. */
13417 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
13418 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
13420 if (at_class_scope_p ()
13421 && COMPLETE_TYPE_P (current_class_type)
13422 && UNSCOPED_ENUM_P (enumtype))
13423 insert_late_enum_def_into_classtype_sorted_fields (enumtype,
13424 current_class_type);
13426 /* Finish debugging output for this type. */
13427 rest_of_type_compilation (enumtype, namespace_bindings_p ());
13429 /* Each enumerator now has the type of its enumeration. Clear the cache
13430 so that this change in types doesn't confuse us later on. */
13431 clear_cv_and_fold_caches ();
13434 /* Finishes the enum type. This is called only the first time an
13435 enumeration is seen, be it opaque or odinary.
13436 ENUMTYPE is the type object. */
13439 finish_enum (tree enumtype)
13441 if (processing_template_decl)
13443 if (at_function_scope_p ())
13444 add_stmt (build_min (TAG_DEFN, enumtype));
13448 /* If this is a forward declaration, there should not be any variants,
13449 though we can get a variant in the middle of an enum-specifier with
13450 wacky code like 'enum E { e = sizeof(const E*) };' */
13451 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
13452 && (TYPE_VALUES (enumtype)
13453 || !TYPE_NEXT_VARIANT (enumtype)));
13456 /* Build and install a CONST_DECL for an enumeration constant of the
13457 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
13458 Apply ATTRIBUTES if available. LOC is the location of NAME.
13459 Assignment of sequential values by default is handled here. */
13462 build_enumerator (tree name, tree value, tree enumtype, tree attributes,
13469 /* scalar_constant_value will pull out this expression, so make sure
13470 it's folded as appropriate. */
13471 if (processing_template_decl)
13472 value = fold_non_dependent_expr (value);
13474 /* If the VALUE was erroneous, pretend it wasn't there; that will
13475 result in the enum being assigned the next value in sequence. */
13476 if (value == error_mark_node)
13479 /* Remove no-op casts from the value. */
13481 STRIP_TYPE_NOPS (value);
13483 if (! processing_template_decl)
13485 /* Validate and default VALUE. */
13486 if (value != NULL_TREE)
13488 if (!ENUM_UNDERLYING_TYPE (enumtype))
13490 tree tmp_value = build_expr_type_conversion (WANT_INT | WANT_ENUM,
13495 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
13496 (TREE_TYPE (value)))
13497 value = perform_implicit_conversion_flags
13498 (ENUM_UNDERLYING_TYPE (enumtype), value, tf_warning_or_error,
13499 LOOKUP_IMPLICIT | LOOKUP_NO_NARROWING);
13501 if (value == error_mark_node)
13504 if (value != NULL_TREE)
13506 value = cxx_constant_value (value);
13508 if (TREE_CODE (value) != INTEGER_CST
13509 || ! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
13511 error ("enumerator value for %qD is not an integer constant",
13518 /* Default based on previous value. */
13519 if (value == NULL_TREE)
13521 if (TYPE_VALUES (enumtype))
13526 /* C++03 7.2/4: If no initializer is specified for the first
13527 enumerator, the type is an unspecified integral
13528 type. Otherwise the type is the same as the type of the
13529 initializing value of the preceding enumerator unless the
13530 incremented value is not representable in that type, in
13531 which case the type is an unspecified integral type
13532 sufficient to contain the incremented value. */
13533 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
13534 if (error_operand_p (prev_value))
13535 value = error_mark_node;
13538 tree type = TREE_TYPE (prev_value);
13539 signop sgn = TYPE_SIGN (type);
13540 widest_int wi = wi::add (wi::to_widest (prev_value), 1, sgn,
13544 bool pos = !wi::neg_p (wi, sgn);
13545 if (!wi::fits_to_tree_p (wi, type))
13548 for (itk = itk_int; itk != itk_none; itk++)
13550 type = integer_types[itk];
13551 if (type != NULL_TREE
13552 && (pos || !TYPE_UNSIGNED (type))
13553 && wi::fits_to_tree_p (wi, type))
13556 if (type && cxx_dialect < cxx11
13557 && itk > itk_unsigned_long)
13558 pedwarn (input_location, OPT_Wlong_long, pos ? "\
13559 incremented enumerator value is too large for %<unsigned long%>" : "\
13560 incremented enumerator value is too large for %<long%>");
13562 if (type == NULL_TREE)
13565 value = wide_int_to_tree (type, wi);
13570 error ("overflow in enumeration values at %qD", name);
13571 value = error_mark_node;
13576 value = integer_zero_node;
13579 /* Remove no-op casts from the value. */
13580 STRIP_TYPE_NOPS (value);
13582 /* If the underlying type of the enum is fixed, check whether
13583 the enumerator values fits in the underlying type. If it
13584 does not fit, the program is ill-formed [C++0x dcl.enum]. */
13585 if (ENUM_UNDERLYING_TYPE (enumtype)
13587 && TREE_CODE (value) == INTEGER_CST)
13589 if (!int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
13590 error ("enumerator value %E is outside the range of underlying "
13591 "type %<%T%>", value, ENUM_UNDERLYING_TYPE (enumtype));
13593 /* Convert the value to the appropriate type. */
13594 value = fold_convert (ENUM_UNDERLYING_TYPE (enumtype), value);
13598 /* C++ associates enums with global, function, or class declarations. */
13599 context = current_scope ();
13601 /* Build the actual enumeration constant. Note that the enumeration
13602 constants have the underlying type of the enum (if it is fixed)
13603 or the type of their initializer (if the underlying type of the
13604 enum is not fixed):
13608 If the underlying type is fixed, the type of each enumerator
13609 prior to the closing brace is the underlying type; if the
13610 initializing value of an enumerator cannot be represented by
13611 the underlying type, the program is ill-formed. If the
13612 underlying type is not fixed, the type of each enumerator is
13613 the type of its initializing value.
13615 If the underlying type is not fixed, it will be computed by
13616 finish_enum and we will reset the type of this enumerator. Of
13617 course, if we're processing a template, there may be no value. */
13618 type = value ? TREE_TYPE (value) : NULL_TREE;
13620 decl = build_decl (loc, CONST_DECL, name, type);
13622 DECL_CONTEXT (decl) = enumtype;
13623 TREE_CONSTANT (decl) = 1;
13624 TREE_READONLY (decl) = 1;
13625 DECL_INITIAL (decl) = value;
13628 cplus_decl_attributes (&decl, attributes, 0);
13630 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
13631 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
13632 on the TYPE_FIELDS list for `S'. (That's so that you can say
13633 things like `S::i' later.) */
13634 finish_member_declaration (decl);
13638 /* Add this enumeration constant to the list for this type. */
13639 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
13642 /* Look for an enumerator with the given NAME within the enumeration
13643 type ENUMTYPE. This routine is used primarily for qualified name
13644 lookup into an enumerator in C++0x, e.g.,
13646 enum class Color { Red, Green, Blue };
13648 Color color = Color::Red;
13650 Returns the value corresponding to the enumerator, or
13651 NULL_TREE if no such enumerator was found. */
13653 lookup_enumerator (tree enumtype, tree name)
13656 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
13658 e = purpose_member (name, TYPE_VALUES (enumtype));
13659 return e? TREE_VALUE (e) : NULL_TREE;
13663 /* We're defining DECL. Make sure that its type is OK. */
13666 check_function_type (tree decl, tree current_function_parms)
13668 tree fntype = TREE_TYPE (decl);
13669 tree return_type = complete_type (TREE_TYPE (fntype));
13671 /* In a function definition, arg types must be complete. */
13672 require_complete_types_for_parms (current_function_parms);
13674 if (dependent_type_p (return_type)
13675 || type_uses_auto (return_type))
13677 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
13678 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
13680 tree args = TYPE_ARG_TYPES (fntype);
13682 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
13683 error ("return type %q#T is incomplete", return_type);
13685 error ("return type has Java class type %q#T", return_type);
13687 /* Make it return void instead. */
13688 if (TREE_CODE (fntype) == METHOD_TYPE)
13689 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
13691 TREE_CHAIN (args));
13693 fntype = build_function_type (void_type_node, args);
13695 = build_exception_variant (fntype,
13696 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
13697 fntype = (cp_build_type_attribute_variant
13698 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
13699 TREE_TYPE (decl) = fntype;
13702 abstract_virtuals_error (decl, TREE_TYPE (fntype));
13705 /* True iff FN is an implicitly-defined default constructor. */
13708 implicit_default_ctor_p (tree fn)
13710 return (DECL_CONSTRUCTOR_P (fn)
13711 && !user_provided_p (fn)
13712 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn)));
13715 /* Create the FUNCTION_DECL for a function definition.
13716 DECLSPECS and DECLARATOR are the parts of the declaration;
13717 they describe the function's name and the type it returns,
13718 but twisted together in a fashion that parallels the syntax of C.
13720 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
13721 DECLARATOR is really the DECL for the function we are about to
13722 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
13723 indicating that the function is an inline defined in-class.
13725 This function creates a binding context for the function body
13726 as well as setting up the FUNCTION_DECL in current_function_decl.
13728 For C++, we must first check whether that datum makes any sense.
13729 For example, "class A local_a(1,2);" means that variable local_a
13730 is an aggregate of type A, which should have a constructor
13731 applied to it with the argument list [1, 2].
13733 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
13734 or may be a BLOCK if the function has been defined previously
13735 in this translation unit. On exit, DECL_INITIAL (decl1) will be
13736 error_mark_node if the function has never been defined, or
13737 a BLOCK if the function has been defined somewhere. */
13740 start_preparsed_function (tree decl1, tree attrs, int flags)
13742 tree ctype = NULL_TREE;
13745 int doing_friend = 0;
13746 cp_binding_level *bl;
13747 tree current_function_parms;
13748 struct c_fileinfo *finfo
13749 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
13750 bool honor_interface;
13752 /* Sanity check. */
13753 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node)));
13754 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
13756 fntype = TREE_TYPE (decl1);
13757 if (TREE_CODE (fntype) == METHOD_TYPE)
13758 ctype = TYPE_METHOD_BASETYPE (fntype);
13760 /* ISO C++ 11.4/5. A friend function defined in a class is in
13761 the (lexical) scope of the class in which it is defined. */
13762 if (!ctype && DECL_FRIEND_P (decl1))
13764 ctype = DECL_FRIEND_CONTEXT (decl1);
13766 /* CTYPE could be null here if we're dealing with a template;
13767 for example, `inline friend float foo()' inside a template
13768 will have no CTYPE set. */
13769 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
13775 if (DECL_DECLARED_INLINE_P (decl1)
13776 && lookup_attribute ("noinline", attrs))
13777 warning_at (DECL_SOURCE_LOCATION (decl1), 0,
13778 "inline function %qD given attribute noinline", decl1);
13780 /* Handle gnu_inline attribute. */
13781 if (GNU_INLINE_P (decl1))
13783 DECL_EXTERNAL (decl1) = 1;
13784 DECL_NOT_REALLY_EXTERN (decl1) = 0;
13785 DECL_INTERFACE_KNOWN (decl1) = 1;
13786 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
13789 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
13790 /* This is a constructor, we must ensure that any default args
13791 introduced by this definition are propagated to the clones
13792 now. The clones are used directly in overload resolution. */
13793 adjust_clone_args (decl1);
13795 /* Sometimes we don't notice that a function is a static member, and
13796 build a METHOD_TYPE for it. Fix that up now. */
13797 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
13798 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
13800 /* Set up current_class_type, and enter the scope of the class, if
13803 push_nested_class (ctype);
13804 else if (DECL_STATIC_FUNCTION_P (decl1))
13805 push_nested_class (DECL_CONTEXT (decl1));
13807 /* Now that we have entered the scope of the class, we must restore
13808 the bindings for any template parameters surrounding DECL1, if it
13809 is an inline member template. (Order is important; consider the
13810 case where a template parameter has the same name as a field of
13811 the class.) It is not until after this point that
13812 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
13813 if (flags & SF_INCLASS_INLINE)
13814 maybe_begin_member_template_processing (decl1);
13816 /* Effective C++ rule 15. */
13818 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
13819 && VOID_TYPE_P (TREE_TYPE (fntype)))
13820 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
13822 /* Make the init_value nonzero so pushdecl knows this is not tentative.
13823 error_mark_node is replaced below (in poplevel) with the BLOCK. */
13824 if (!DECL_INITIAL (decl1))
13825 DECL_INITIAL (decl1) = error_mark_node;
13827 /* This function exists in static storage.
13828 (This does not mean `static' in the C sense!) */
13829 TREE_STATIC (decl1) = 1;
13831 /* We must call push_template_decl after current_class_type is set
13832 up. (If we are processing inline definitions after exiting a
13833 class scope, current_class_type will be NULL_TREE until set above
13834 by push_nested_class.) */
13835 if (processing_template_decl)
13837 tree newdecl1 = push_template_decl (decl1);
13838 if (newdecl1 == error_mark_node)
13840 if (ctype || DECL_STATIC_FUNCTION_P (decl1))
13841 pop_nested_class ();
13847 /* We are now in the scope of the function being defined. */
13848 current_function_decl = decl1;
13850 /* Save the parm names or decls from this function's declarator
13851 where store_parm_decls will find them. */
13852 current_function_parms = DECL_ARGUMENTS (decl1);
13854 /* Make sure the parameter and return types are reasonable. When
13855 you declare a function, these types can be incomplete, but they
13856 must be complete when you define the function. */
13857 check_function_type (decl1, current_function_parms);
13859 /* Build the return declaration for the function. */
13860 restype = TREE_TYPE (fntype);
13862 if (DECL_RESULT (decl1) == NULL_TREE)
13866 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
13867 DECL_ARTIFICIAL (resdecl) = 1;
13868 DECL_IGNORED_P (resdecl) = 1;
13869 DECL_RESULT (decl1) = resdecl;
13871 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
13874 /* Let the user know we're compiling this function. */
13875 announce_function (decl1);
13877 /* Record the decl so that the function name is defined.
13878 If we already have a decl for this name, and it is a FUNCTION_DECL,
13879 use the old decl. */
13880 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
13882 /* A specialization is not used to guide overload resolution. */
13883 if (!DECL_FUNCTION_MEMBER_P (decl1)
13884 && !(DECL_USE_TEMPLATE (decl1) &&
13885 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
13887 tree olddecl = pushdecl (decl1);
13889 if (olddecl == error_mark_node)
13890 /* If something went wrong when registering the declaration,
13891 use DECL1; we have to have a FUNCTION_DECL to use when
13892 parsing the body of the function. */
13896 /* Otherwise, OLDDECL is either a previous declaration
13897 of the same function or DECL1 itself. */
13899 if (warn_missing_declarations
13900 && olddecl == decl1
13901 && !DECL_MAIN_P (decl1)
13902 && TREE_PUBLIC (decl1)
13903 && !DECL_DECLARED_INLINE_P (decl1))
13907 /* Check whether DECL1 is in an anonymous
13909 for (context = DECL_CONTEXT (decl1);
13911 context = DECL_CONTEXT (context))
13913 if (TREE_CODE (context) == NAMESPACE_DECL
13914 && DECL_NAME (context) == NULL_TREE)
13918 if (context == NULL)
13919 warning_at (DECL_SOURCE_LOCATION (decl1),
13920 OPT_Wmissing_declarations,
13921 "no previous declaration for %qD", decl1);
13929 /* We need to set the DECL_CONTEXT. */
13930 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
13931 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
13933 fntype = TREE_TYPE (decl1);
13934 restype = TREE_TYPE (fntype);
13936 /* If #pragma weak applies, mark the decl appropriately now.
13937 The pragma only applies to global functions. Because
13938 determining whether or not the #pragma applies involves
13939 computing the mangled name for the declaration, we cannot
13940 apply the pragma until after we have merged this declaration
13941 with any previous declarations; if the original declaration
13942 has a linkage specification, that specification applies to
13943 the definition as well, and may affect the mangled name. */
13944 if (DECL_FILE_SCOPE_P (decl1))
13945 maybe_apply_pragma_weak (decl1);
13948 /* Reset this in case the call to pushdecl changed it. */
13949 current_function_decl = decl1;
13951 gcc_assert (DECL_INITIAL (decl1));
13953 /* This function may already have been parsed, in which case just
13954 return; our caller will skip over the body without parsing. */
13955 if (DECL_INITIAL (decl1) != error_mark_node)
13958 /* Initialize RTL machinery. We cannot do this until
13959 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
13960 even when processing a template; this is how we get
13961 CFUN set up, and our per-function variables initialized.
13962 FIXME factor out the non-RTL stuff. */
13963 bl = current_binding_level;
13964 allocate_struct_function (decl1, processing_template_decl);
13966 /* Initialize the language data structures. Whenever we start
13967 a new function, we destroy temporaries in the usual way. */
13968 cfun->language = ggc_cleared_alloc<language_function> ();
13969 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
13970 current_binding_level = bl;
13972 if (!processing_template_decl && type_uses_auto (restype))
13974 FNDECL_USED_AUTO (decl1) = true;
13975 current_function_auto_return_pattern = restype;
13978 /* Start the statement-tree, start the tree now. */
13979 DECL_SAVED_TREE (decl1) = push_stmt_list ();
13981 /* If we are (erroneously) defining a function that we have already
13982 defined before, wipe out what we knew before. */
13983 if (!DECL_PENDING_INLINE_P (decl1))
13984 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
13986 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
13988 /* We know that this was set up by `grokclassfn'. We do not
13989 wait until `store_parm_decls', since evil parse errors may
13990 never get us to that point. Here we keep the consistency
13991 between `current_class_type' and `current_class_ptr'. */
13992 tree t = DECL_ARGUMENTS (decl1);
13994 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
13995 gcc_assert (TYPE_PTR_P (TREE_TYPE (t)));
13997 cp_function_chain->x_current_class_ref
13998 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
13999 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
14000 cp_function_chain->x_current_class_ptr = t;
14002 /* Constructors and destructors need to know whether they're "in
14003 charge" of initializing virtual base classes. */
14004 t = DECL_CHAIN (t);
14005 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
14007 current_in_charge_parm = t;
14008 t = DECL_CHAIN (t);
14010 if (DECL_HAS_VTT_PARM_P (decl1))
14012 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
14013 current_vtt_parm = t;
14017 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
14018 /* Implicitly-defined methods (like the
14019 destructor for a class in which no destructor
14020 is explicitly declared) must not be defined
14021 until their definition is needed. So, we
14022 ignore interface specifications for
14023 compiler-generated functions. */
14024 && !DECL_ARTIFICIAL (decl1));
14026 if (processing_template_decl)
14027 /* Don't mess with interface flags. */;
14028 else if (DECL_INTERFACE_KNOWN (decl1))
14030 tree ctx = decl_function_context (decl1);
14032 if (DECL_NOT_REALLY_EXTERN (decl1))
14033 DECL_EXTERNAL (decl1) = 0;
14035 if (ctx != NULL_TREE && vague_linkage_p (ctx))
14036 /* This is a function in a local class in an extern inline
14037 or template function. */
14038 comdat_linkage (decl1);
14040 /* If this function belongs to an interface, it is public.
14041 If it belongs to someone else's interface, it is also external.
14042 This only affects inlines and template instantiations. */
14043 else if (!finfo->interface_unknown && honor_interface)
14045 if (DECL_DECLARED_INLINE_P (decl1)
14046 || DECL_TEMPLATE_INSTANTIATION (decl1))
14048 DECL_EXTERNAL (decl1)
14049 = (finfo->interface_only
14050 || (DECL_DECLARED_INLINE_P (decl1)
14051 && ! flag_implement_inlines
14052 && !DECL_VINDEX (decl1)));
14054 /* For WIN32 we also want to put these in linkonce sections. */
14055 maybe_make_one_only (decl1);
14058 DECL_EXTERNAL (decl1) = 0;
14059 DECL_INTERFACE_KNOWN (decl1) = 1;
14060 /* If this function is in an interface implemented in this file,
14061 make sure that the back end knows to emit this function
14063 if (!DECL_EXTERNAL (decl1))
14064 mark_needed (decl1);
14066 else if (finfo->interface_unknown && finfo->interface_only
14067 && honor_interface)
14069 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
14070 interface, we will have both finfo->interface_unknown and
14071 finfo->interface_only set. In that case, we don't want to
14072 use the normal heuristics because someone will supply a
14073 #pragma implementation elsewhere, and deducing it here would
14074 produce a conflict. */
14075 comdat_linkage (decl1);
14076 DECL_EXTERNAL (decl1) = 0;
14077 DECL_INTERFACE_KNOWN (decl1) = 1;
14078 DECL_DEFER_OUTPUT (decl1) = 1;
14082 /* This is a definition, not a reference.
14083 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
14084 if (!GNU_INLINE_P (decl1))
14085 DECL_EXTERNAL (decl1) = 0;
14087 if ((DECL_DECLARED_INLINE_P (decl1)
14088 || DECL_TEMPLATE_INSTANTIATION (decl1))
14089 && ! DECL_INTERFACE_KNOWN (decl1))
14090 DECL_DEFER_OUTPUT (decl1) = 1;
14092 DECL_INTERFACE_KNOWN (decl1) = 1;
14095 /* Determine the ELF visibility attribute for the function. We must not
14096 do this before calling "pushdecl", as we must allow "duplicate_decls"
14097 to merge any attributes appropriately. We also need to wait until
14099 if (!DECL_CLONED_FUNCTION_P (decl1))
14100 determine_visibility (decl1);
14102 if (!processing_template_decl)
14103 maybe_instantiate_noexcept (decl1);
14105 begin_scope (sk_function_parms, decl1);
14109 if (DECL_DESTRUCTOR_P (decl1)
14110 || (DECL_CONSTRUCTOR_P (decl1)
14111 && targetm.cxx.cdtor_returns_this ()))
14113 cdtor_label = create_artificial_label (input_location);
14116 start_fname_decls ();
14118 store_parm_decls (current_function_parms);
14120 if (!processing_template_decl
14121 && (flag_lifetime_dse > 1)
14122 && DECL_CONSTRUCTOR_P (decl1)
14123 && !DECL_CLONED_FUNCTION_P (decl1)
14124 /* We can't clobber safely for an implicitly-defined default constructor
14125 because part of the initialization might happen before we enter the
14126 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
14127 && !implicit_default_ctor_p (decl1))
14129 /* Insert a clobber to let the back end know that the object storage
14130 is dead when we enter the constructor. */
14131 tree btype = CLASSTYPE_AS_BASE (current_class_type);
14132 tree clobber = build_constructor (btype, NULL);
14133 TREE_THIS_VOLATILE (clobber) = true;
14134 tree bref = build_nop (build_reference_type (btype), current_class_ptr);
14135 bref = convert_from_reference (bref);
14136 tree exprstmt = build2 (MODIFY_EXPR, btype, bref, clobber);
14137 finish_expr_stmt (exprstmt);
14140 if (!processing_template_decl
14141 && DECL_CONSTRUCTOR_P (decl1)
14142 && (flag_sanitize & SANITIZE_VPTR)
14143 && !DECL_CLONED_FUNCTION_P (decl1)
14144 && !implicit_default_ctor_p (decl1))
14145 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr);
14151 /* Like start_preparsed_function, except that instead of a
14152 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
14154 Returns true on success. If the DECLARATOR is not suitable
14155 for a function, we return false, which tells the parser to
14156 skip the entire function. */
14159 start_function (cp_decl_specifier_seq *declspecs,
14160 const cp_declarator *declarator,
14165 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
14166 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION, decl1);
14167 if (decl1 == error_mark_node)
14169 /* If the declarator is not suitable for a function definition,
14170 cause a syntax error. */
14171 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
14173 error ("invalid function declaration");
14177 if (DECL_MAIN_P (decl1))
14178 /* main must return int. grokfndecl should have corrected it
14179 (and issued a diagnostic) if the user got it wrong. */
14180 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
14181 integer_type_node));
14183 return start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
14186 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
14190 use_eh_spec_block (tree fn)
14192 return (flag_exceptions && flag_enforce_eh_specs
14193 && !processing_template_decl
14194 && !type_throw_all_p (TREE_TYPE (fn))
14195 /* We insert the EH_SPEC_BLOCK only in the original
14196 function; then, it is copied automatically to the
14198 && !DECL_CLONED_FUNCTION_P (fn)
14199 /* Implicitly-generated constructors and destructors have
14200 exception specifications. However, those specifications
14201 are the union of the possible exceptions specified by the
14202 constructors/destructors for bases and members, so no
14203 unallowed exception will ever reach this function. By
14204 not creating the EH_SPEC_BLOCK we save a little memory,
14205 and we avoid spurious warnings about unreachable
14207 && !DECL_DEFAULTED_FN (fn));
14210 /* Store the parameter declarations into the current function declaration.
14211 This is called after parsing the parameter declarations, before
14212 digesting the body of the function.
14214 Also install to binding contour return value identifier, if any. */
14217 store_parm_decls (tree current_function_parms)
14219 tree fndecl = current_function_decl;
14222 /* This is a chain of any other decls that came in among the parm
14223 declarations. If a parm is declared with enum {foo, bar} x;
14224 then CONST_DECLs for foo and bar are put here. */
14225 tree nonparms = NULL_TREE;
14227 if (current_function_parms)
14229 /* This case is when the function was defined with an ANSI prototype.
14230 The parms already have decls, so we need not do anything here
14231 except record them as in effect
14232 and complain if any redundant old-style parm decls were written. */
14234 tree specparms = current_function_parms;
14237 /* Must clear this because it might contain TYPE_DECLs declared
14239 current_binding_level->names = NULL;
14241 /* If we're doing semantic analysis, then we'll call pushdecl
14242 for each of these. We must do them in reverse order so that
14243 they end in the correct forward order. */
14244 specparms = nreverse (specparms);
14246 for (parm = specparms; parm; parm = next)
14248 next = DECL_CHAIN (parm);
14249 if (TREE_CODE (parm) == PARM_DECL)
14251 if (DECL_NAME (parm) == NULL_TREE
14252 || !VOID_TYPE_P (parm))
14255 error ("parameter %qD declared void", parm);
14259 /* If we find an enum constant or a type tag,
14260 put it aside for the moment. */
14261 TREE_CHAIN (parm) = NULL_TREE;
14262 nonparms = chainon (nonparms, parm);
14266 /* Get the decls in their original chain order and record in the
14267 function. This is all and only the PARM_DECLs that were
14268 pushed into scope by the loop above. */
14269 DECL_ARGUMENTS (fndecl) = getdecls ();
14272 DECL_ARGUMENTS (fndecl) = NULL_TREE;
14274 /* Now store the final chain of decls for the arguments
14275 as the decl-chain of the current lexical scope.
14276 Put the enumerators in as well, at the front so that
14277 DECL_ARGUMENTS is not modified. */
14278 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
14280 if (use_eh_spec_block (current_function_decl))
14281 current_eh_spec_block = begin_eh_spec_block ();
14285 /* We have finished doing semantic analysis on DECL, but have not yet
14286 generated RTL for its body. Save away our current state, so that
14287 when we want to generate RTL later we know what to do. */
14290 save_function_data (tree decl)
14292 struct language_function *f;
14294 /* Save the language-specific per-function data so that we can
14295 get it back when we really expand this function. */
14296 gcc_assert (!DECL_PENDING_INLINE_P (decl));
14299 f = ggc_alloc<language_function> ();
14300 memcpy (f, cp_function_chain, sizeof (struct language_function));
14301 DECL_SAVED_FUNCTION_DATA (decl) = f;
14303 /* Clear out the bits we don't need. */
14304 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
14305 f->bindings = NULL;
14306 f->x_local_names = NULL;
14307 f->base.local_typedefs = NULL;
14311 /* Set the return value of the constructor (if present). */
14314 finish_constructor_body (void)
14319 if (targetm.cxx.cdtor_returns_this ()
14320 && (! TYPE_FOR_JAVA (current_class_type)))
14322 /* Any return from a constructor will end up here. */
14323 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
14325 val = DECL_ARGUMENTS (current_function_decl);
14326 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
14327 DECL_RESULT (current_function_decl), val);
14328 /* Return the address of the object. */
14329 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
14330 add_stmt (exprstmt);
14334 /* Do all the processing for the beginning of a destructor; set up the
14335 vtable pointers and cleanups for bases and members. */
14338 begin_destructor_body (void)
14340 tree compound_stmt;
14342 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
14343 issued an error message. We still want to try to process the
14344 body of the function, but initialize_vtbl_ptrs will crash if
14345 TYPE_BINFO is NULL. */
14346 if (COMPLETE_TYPE_P (current_class_type))
14348 compound_stmt = begin_compound_stmt (0);
14349 /* Make all virtual function table pointers in non-virtual base
14350 classes point to CURRENT_CLASS_TYPE's virtual function
14352 initialize_vtbl_ptrs (current_class_ptr);
14353 finish_compound_stmt (compound_stmt);
14355 if (flag_lifetime_dse)
14357 /* Insert a cleanup to let the back end know that the object is dead
14358 when we exit the destructor, either normally or via exception. */
14359 tree btype = CLASSTYPE_AS_BASE (current_class_type);
14360 tree clobber = build_constructor (btype, NULL);
14361 TREE_THIS_VOLATILE (clobber) = true;
14362 tree bref = build_nop (build_reference_type (btype),
14363 current_class_ptr);
14364 bref = convert_from_reference (bref);
14365 tree exprstmt = build2 (MODIFY_EXPR, btype, bref, clobber);
14366 finish_decl_cleanup (NULL_TREE, exprstmt);
14369 /* And insert cleanups for our bases and members so that they
14370 will be properly destroyed if we throw. */
14371 push_base_cleanups ();
14375 /* At the end of every destructor we generate code to delete the object if
14376 necessary. Do that now. */
14379 finish_destructor_body (void)
14383 /* Any return from a destructor will end up here; that way all base
14384 and member cleanups will be run when the function returns. */
14385 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
14387 /* In a virtual destructor, we must call delete. */
14388 if (DECL_VIRTUAL_P (current_function_decl))
14391 tree virtual_size = cxx_sizeof (current_class_type);
14395 At the point of definition of a virtual destructor (including
14396 an implicit definition), non-placement operator delete shall
14397 be looked up in the scope of the destructor's class and if
14398 found shall be accessible and unambiguous. */
14399 exprstmt = build_op_delete_call (DELETE_EXPR, current_class_ptr,
14401 /*global_p=*/false,
14402 /*placement=*/NULL_TREE,
14403 /*alloc_fn=*/NULL_TREE,
14404 tf_warning_or_error);
14406 if_stmt = begin_if_stmt ();
14407 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
14408 current_in_charge_parm,
14411 finish_expr_stmt (exprstmt);
14412 finish_then_clause (if_stmt);
14413 finish_if_stmt (if_stmt);
14416 if (targetm.cxx.cdtor_returns_this ())
14420 val = DECL_ARGUMENTS (current_function_decl);
14421 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
14422 DECL_RESULT (current_function_decl), val);
14423 /* Return the address of the object. */
14424 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
14425 add_stmt (exprstmt);
14429 /* Do the necessary processing for the beginning of a function body, which
14430 in this case includes member-initializers, but not the catch clauses of
14431 a function-try-block. Currently, this means opening a binding level
14432 for the member-initializers (in a ctor), member cleanups (in a dtor),
14433 and capture proxies (in a lambda operator()). */
14436 begin_function_body (void)
14440 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
14443 if (processing_template_decl)
14444 /* Do nothing now. */;
14446 /* Always keep the BLOCK node associated with the outermost pair of
14447 curly braces of a function. These are needed for correct
14448 operation of dwarfout.c. */
14449 keep_next_level (true);
14451 stmt = begin_compound_stmt (BCS_FN_BODY);
14453 if (processing_template_decl)
14454 /* Do nothing now. */;
14455 else if (DECL_DESTRUCTOR_P (current_function_decl))
14456 begin_destructor_body ();
14461 /* Do the processing for the end of a function body. Currently, this means
14462 closing out the cleanups for fully-constructed bases and members, and in
14463 the case of the destructor, deleting the object if desired. Again, this
14464 is only meaningful for [cd]tors, since they are the only functions where
14465 there is a significant distinction between the main body and any
14466 function catch clauses. Handling, say, main() return semantics here
14467 would be wrong, as flowing off the end of a function catch clause for
14468 main() would also need to return 0. */
14471 finish_function_body (tree compstmt)
14473 if (compstmt == NULL_TREE)
14476 /* Close the block. */
14477 finish_compound_stmt (compstmt);
14479 if (processing_template_decl)
14480 /* Do nothing now. */;
14481 else if (DECL_CONSTRUCTOR_P (current_function_decl))
14482 finish_constructor_body ();
14483 else if (DECL_DESTRUCTOR_P (current_function_decl))
14484 finish_destructor_body ();
14487 /* Given a function, returns the BLOCK corresponding to the outermost level
14488 of curly braces, skipping the artificial block created for constructor
14492 outer_curly_brace_block (tree fndecl)
14494 tree block = DECL_INITIAL (fndecl);
14495 if (BLOCK_OUTER_CURLY_BRACE_P (block))
14497 block = BLOCK_SUBBLOCKS (block);
14498 if (BLOCK_OUTER_CURLY_BRACE_P (block))
14500 block = BLOCK_SUBBLOCKS (block);
14501 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block));
14505 /* If FNDECL is a class's key method, add the class to the list of
14506 keyed classes that should be emitted. */
14509 record_key_method_defined (tree fndecl)
14511 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
14512 && DECL_VIRTUAL_P (fndecl)
14513 && !processing_template_decl)
14515 tree fnclass = DECL_CONTEXT (fndecl);
14516 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
14517 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
14521 /* Subroutine of finish_function.
14522 Save the body of constexpr functions for possible
14523 future compile time evaluation. */
14526 maybe_save_function_definition (tree fun)
14528 if (!processing_template_decl
14529 && DECL_DECLARED_CONSTEXPR_P (fun)
14530 && !cp_function_chain->invalid_constexpr
14531 && !DECL_CLONED_FUNCTION_P (fun))
14532 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
14535 /* Finish up a function declaration and compile that function
14536 all the way to assembler language output. The free the storage
14537 for the function definition.
14539 FLAGS is a bitwise or of the following values:
14541 We just finished processing the body of an in-class inline
14542 function definition. (This processing will have taken place
14543 after the class definition is complete.) */
14546 finish_function (int flags)
14548 tree fndecl = current_function_decl;
14549 tree fntype, ctype = NULL_TREE;
14550 int inclass_inline = (flags & 2) != 0;
14552 /* When we get some parse errors, we can end up without a
14553 current_function_decl, so cope. */
14554 if (fndecl == NULL_TREE)
14555 return error_mark_node;
14557 if (c_dialect_objc ())
14558 objc_finish_function ();
14560 gcc_assert (!defer_mark_used_calls);
14561 defer_mark_used_calls = true;
14563 record_key_method_defined (fndecl);
14565 fntype = TREE_TYPE (fndecl);
14567 /* TREE_READONLY (fndecl) = 1;
14568 This caused &foo to be of type ptr-to-const-function
14569 which then got a warning when stored in a ptr-to-function variable. */
14571 gcc_assert (building_stmt_list_p ());
14572 /* The current function is being defined, so its DECL_INITIAL should
14573 be set, and unless there's a multiple definition, it should be
14574 error_mark_node. */
14575 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
14577 /* For a cloned function, we've already got all the code we need;
14578 there's no need to add any extra bits. */
14579 if (!DECL_CLONED_FUNCTION_P (fndecl))
14581 /* Make it so that `main' always returns 0 by default. */
14582 if (DECL_MAIN_P (current_function_decl))
14583 finish_return_stmt (integer_zero_node);
14585 if (use_eh_spec_block (current_function_decl))
14586 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
14587 (TREE_TYPE (current_function_decl)),
14588 current_eh_spec_block);
14591 /* If we're saving up tree structure, tie off the function now. */
14592 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
14594 if (fn_contains_cilk_spawn_p (cfun) && !processing_template_decl)
14595 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
14597 finish_fname_decls ();
14599 /* If this function can't throw any exceptions, remember that. */
14600 if (!processing_template_decl
14601 && !cp_function_chain->can_throw
14602 && !flag_non_call_exceptions
14603 && !decl_replaceable_p (fndecl))
14604 TREE_NOTHROW (fndecl) = 1;
14606 /* This must come after expand_function_end because cleanups might
14607 have declarations (from inline functions) that need to go into
14608 this function's blocks. */
14610 /* If the current binding level isn't the outermost binding level
14611 for this function, either there is a bug, or we have experienced
14612 syntax errors and the statement tree is malformed. */
14613 if (current_binding_level->kind != sk_function_parms)
14615 /* Make sure we have already experienced errors. */
14616 gcc_assert (errorcount);
14618 /* Throw away the broken statement tree and extra binding
14620 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
14622 while (current_binding_level->kind != sk_function_parms)
14624 if (current_binding_level->kind == sk_class)
14625 pop_nested_class ();
14627 poplevel (0, 0, 0);
14630 poplevel (1, 0, 1);
14632 /* Statements should always be full-expressions at the outermost set
14633 of curly braces for a function. */
14634 gcc_assert (stmts_are_full_exprs_p ());
14636 /* If there are no return statements in a function with auto return type,
14637 the return type is void. But if the declared type is something like
14638 auto*, this is an error. */
14639 if (!processing_template_decl && FNDECL_USED_AUTO (fndecl)
14640 && TREE_TYPE (fntype) == current_function_auto_return_pattern)
14642 if (!is_auto (current_function_auto_return_pattern)
14643 && !current_function_returns_value && !current_function_returns_null)
14645 error ("no return statements in function returning %qT",
14646 current_function_auto_return_pattern);
14647 inform (input_location, "only plain %<auto%> return type can be "
14648 "deduced to %<void%>");
14650 apply_deduced_return_type (fndecl, void_type_node);
14651 fntype = TREE_TYPE (fndecl);
14654 // If this is a concept, check that the definition is reasonable.
14655 if (DECL_DECLARED_CONCEPT_P (fndecl))
14656 check_function_concept (fndecl);
14658 /* Save constexpr function body before it gets munged by
14659 the NRV transformation. */
14660 maybe_save_function_definition (fndecl);
14662 /* Invoke the pre-genericize plugin before we start munging things. */
14663 if (!processing_template_decl)
14664 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
14666 /* Perform delayed folding before NRV transformation. */
14667 if (!processing_template_decl)
14668 cp_fold_function (fndecl);
14670 /* Set up the named return value optimization, if we can. Candidate
14671 variables are selected in check_return_expr. */
14672 if (current_function_return_value)
14674 tree r = current_function_return_value;
14677 if (r != error_mark_node
14678 /* This is only worth doing for fns that return in memory--and
14679 simpler, since we don't have to worry about promoted modes. */
14680 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
14681 /* Only allow this for variables declared in the outer scope of
14682 the function so we know that their lifetime always ends with a
14683 return; see g++.dg/opt/nrv6.C. We could be more flexible if
14684 we were to do this optimization in tree-ssa. */
14685 && (outer = outer_curly_brace_block (fndecl))
14686 && chain_member (r, BLOCK_VARS (outer)))
14687 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
14689 current_function_return_value = NULL_TREE;
14692 /* Remember that we were in class scope. */
14693 if (current_class_name)
14694 ctype = current_class_type;
14696 /* Must mark the RESULT_DECL as being in this function. */
14697 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
14699 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
14700 to the FUNCTION_DECL node itself. */
14701 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
14703 /* Save away current state, if appropriate. */
14704 if (!processing_template_decl)
14705 save_function_data (fndecl);
14707 /* Complain if there's just no return statement. */
14708 if (warn_return_type
14709 && !VOID_TYPE_P (TREE_TYPE (fntype))
14710 && !dependent_type_p (TREE_TYPE (fntype))
14711 && !current_function_returns_value && !current_function_returns_null
14712 /* Don't complain if we abort or throw. */
14713 && !current_function_returns_abnormally
14714 /* Don't complain if there's an infinite loop. */
14715 && !current_function_infinite_loop
14716 /* Don't complain if we are declared noreturn. */
14717 && !TREE_THIS_VOLATILE (fndecl)
14718 && !DECL_NAME (DECL_RESULT (fndecl))
14719 && !TREE_NO_WARNING (fndecl)
14720 /* Structor return values (if any) are set by the compiler. */
14721 && !DECL_CONSTRUCTOR_P (fndecl)
14722 && !DECL_DESTRUCTOR_P (fndecl)
14723 && targetm.warn_func_return (fndecl))
14725 warning (OPT_Wreturn_type,
14726 "no return statement in function returning non-void");
14727 TREE_NO_WARNING (fndecl) = 1;
14730 /* Store the end of the function, so that we get good line number
14731 info for the epilogue. */
14732 cfun->function_end_locus = input_location;
14734 /* Complain about parameters that are only set, but never otherwise used. */
14735 if (warn_unused_but_set_parameter
14736 && !processing_template_decl
14737 && errorcount == unused_but_set_errorcount
14738 && !DECL_CLONED_FUNCTION_P (fndecl))
14742 for (decl = DECL_ARGUMENTS (fndecl);
14744 decl = DECL_CHAIN (decl))
14745 if (TREE_USED (decl)
14746 && TREE_CODE (decl) == PARM_DECL
14747 && !DECL_READ_P (decl)
14748 && DECL_NAME (decl)
14749 && !DECL_ARTIFICIAL (decl)
14750 && !TREE_NO_WARNING (decl)
14751 && !DECL_IN_SYSTEM_HEADER (decl)
14752 && TREE_TYPE (decl) != error_mark_node
14753 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
14754 && (!CLASS_TYPE_P (TREE_TYPE (decl))
14755 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
14756 warning_at (DECL_SOURCE_LOCATION (decl),
14757 OPT_Wunused_but_set_parameter,
14758 "parameter %qD set but not used", decl);
14759 unused_but_set_errorcount = errorcount;
14762 /* Complain about locally defined typedefs that are not used in this
14764 maybe_warn_unused_local_typedefs ();
14766 /* Possibly warn about unused parameters. */
14767 if (warn_unused_parameter
14768 && !processing_template_decl
14769 && !DECL_CLONED_FUNCTION_P (fndecl))
14770 do_warn_unused_parameter (fndecl);
14772 /* Genericize before inlining. */
14773 if (!processing_template_decl)
14775 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
14776 cp_genericize (fndecl);
14777 /* Clear out the bits we don't need. */
14778 f->x_current_class_ptr = NULL;
14779 f->x_current_class_ref = NULL;
14780 f->x_eh_spec_block = NULL;
14781 f->x_in_charge_parm = NULL;
14782 f->x_vtt_parm = NULL;
14783 f->x_return_value = NULL;
14784 f->bindings = NULL;
14785 f->extern_decl_map = NULL;
14786 f->infinite_loops = NULL;
14788 /* Clear out the bits we don't need. */
14789 local_names = NULL;
14791 /* We're leaving the context of this function, so zap cfun. It's still in
14792 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
14794 current_function_decl = NULL;
14796 /* If this is an in-class inline definition, we may have to pop the
14797 bindings for the template parameters that we added in
14798 maybe_begin_member_template_processing when start_function was
14800 if (inclass_inline)
14801 maybe_end_member_template_processing ();
14803 /* Leave the scope of the class. */
14805 pop_nested_class ();
14810 current_function_decl = NULL_TREE;
14812 defer_mark_used_calls = false;
14813 if (deferred_mark_used_calls)
14818 FOR_EACH_VEC_SAFE_ELT (deferred_mark_used_calls, i, decl)
14820 vec_free (deferred_mark_used_calls);
14823 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION, fndecl);
14827 /* Create the FUNCTION_DECL for a function definition.
14828 DECLSPECS and DECLARATOR are the parts of the declaration;
14829 they describe the return type and the name of the function,
14830 but twisted together in a fashion that parallels the syntax of C.
14832 This function creates a binding context for the function body
14833 as well as setting up the FUNCTION_DECL in current_function_decl.
14835 Returns a FUNCTION_DECL on success.
14837 If the DECLARATOR is not suitable for a function (it defines a datum
14838 instead), we return 0, which tells yyparse to report a parse error.
14840 May return void_type_node indicating that this method is actually
14841 a friend. See grokfield for more details.
14843 Came here with a `.pushlevel' .
14845 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
14846 CHANGES TO CODE IN `grokfield'. */
14849 grokmethod (cp_decl_specifier_seq *declspecs,
14850 const cp_declarator *declarator, tree attrlist)
14852 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
14855 if (fndecl == error_mark_node)
14856 return error_mark_node;
14858 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
14860 error ("invalid member function declaration");
14861 return error_mark_node;
14865 cplus_decl_attributes (&fndecl, attrlist, 0);
14867 /* Pass friends other than inline friend functions back. */
14868 if (fndecl == void_type_node)
14871 if (DECL_IN_AGGR_P (fndecl))
14873 if (DECL_CLASS_SCOPE_P (fndecl))
14874 error ("%qD is already defined in class %qT", fndecl,
14875 DECL_CONTEXT (fndecl));
14876 return error_mark_node;
14879 check_template_shadow (fndecl);
14881 if (TREE_PUBLIC (fndecl))
14882 DECL_COMDAT (fndecl) = 1;
14883 DECL_DECLARED_INLINE_P (fndecl) = 1;
14884 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
14886 /* We process method specializations in finish_struct_1. */
14887 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
14889 fndecl = push_template_decl (fndecl);
14890 if (fndecl == error_mark_node)
14894 if (! DECL_FRIEND_P (fndecl))
14896 if (DECL_CHAIN (fndecl))
14898 fndecl = copy_node (fndecl);
14899 TREE_CHAIN (fndecl) = NULL_TREE;
14903 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
14905 DECL_IN_AGGR_P (fndecl) = 1;
14910 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
14911 we can lay it out later, when and if its type becomes complete.
14913 Also handle constexpr variables where the initializer involves
14914 an unlowered PTRMEM_CST because the class isn't complete yet. */
14917 maybe_register_incomplete_var (tree var)
14919 gcc_assert (VAR_P (var));
14921 /* Keep track of variables with incomplete types. */
14922 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
14923 && DECL_EXTERNAL (var))
14925 tree inner_type = TREE_TYPE (var);
14927 while (TREE_CODE (inner_type) == ARRAY_TYPE)
14928 inner_type = TREE_TYPE (inner_type);
14929 inner_type = TYPE_MAIN_VARIANT (inner_type);
14931 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
14932 /* RTTI TD entries are created while defining the type_info. */
14933 || (TYPE_LANG_SPECIFIC (inner_type)
14934 && TYPE_BEING_DEFINED (inner_type)))
14936 incomplete_var iv = {var, inner_type};
14937 vec_safe_push (incomplete_vars, iv);
14939 else if (!(DECL_LANG_SPECIFIC (var) && DECL_TEMPLATE_INFO (var))
14940 && decl_constant_var_p (var)
14941 && (TYPE_PTRMEM_P (inner_type) || CLASS_TYPE_P (inner_type)))
14943 /* When the outermost open class is complete we can resolve any
14944 pointers-to-members. */
14945 tree context = outermost_open_class ();
14946 incomplete_var iv = {var, context};
14947 vec_safe_push (incomplete_vars, iv);
14952 /* Called when a class type (given by TYPE) is defined. If there are
14953 any existing VAR_DECLs whose type has been completed by this
14954 declaration, update them now. */
14957 complete_vars (tree type)
14960 incomplete_var *iv;
14962 for (ix = 0; vec_safe_iterate (incomplete_vars, ix, &iv); )
14964 if (same_type_p (type, iv->incomplete_type))
14966 tree var = iv->decl;
14967 tree type = TREE_TYPE (var);
14969 if (TYPE_MAIN_VARIANT (strip_array_types (type))
14970 == iv->incomplete_type)
14972 /* Complete the type of the variable. The VAR_DECL itself
14973 will be laid out in expand_expr. */
14974 complete_type (type);
14975 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
14978 /* Remove this entry from the list. */
14979 incomplete_vars->unordered_remove (ix);
14985 /* Check for pending declarations which may have abstract type. */
14986 complete_type_check_abstract (type);
14989 /* If DECL is of a type which needs a cleanup, build and return an
14990 expression to perform that cleanup here. Return NULL_TREE if no
14991 cleanup need be done. */
14994 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
15000 /* Assume no cleanup is required. */
15001 cleanup = NULL_TREE;
15003 if (error_operand_p (decl))
15006 /* Handle "__attribute__((cleanup))". We run the cleanup function
15007 before the destructor since the destructor is what actually
15008 terminates the lifetime of the object. */
15009 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
15016 /* Get the name specified by the user for the cleanup function. */
15017 id = TREE_VALUE (TREE_VALUE (attr));
15018 /* Look up the name to find the cleanup function to call. It is
15019 important to use lookup_name here because that is what is
15020 used in c-common.c:handle_cleanup_attribute when performing
15021 initial checks on the attribute. Note that those checks
15022 include ensuring that the function found is not an overloaded
15023 function, or an object with an overloaded call operator,
15024 etc.; we can rely on the fact that the function found is an
15025 ordinary FUNCTION_DECL. */
15026 fn = lookup_name (id);
15027 arg = build_address (decl);
15028 if (!mark_used (decl, complain) && !(complain & tf_error))
15029 return error_mark_node;
15030 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
15031 if (cleanup == error_mark_node)
15032 return error_mark_node;
15034 /* Handle ordinary C++ destructors. */
15035 type = TREE_TYPE (decl);
15036 if (type_build_dtor_call (type))
15038 int flags = LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR;
15042 if (TREE_CODE (type) == ARRAY_TYPE)
15045 addr = build_address (decl);
15047 call = build_delete (TREE_TYPE (addr), addr,
15048 sfk_complete_destructor, flags, 0, complain);
15049 if (call == error_mark_node)
15050 cleanup = error_mark_node;
15051 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
15052 /* Discard the call. */;
15054 cleanup = cp_build_compound_expr (cleanup, call, complain);
15059 /* build_delete sets the location of the destructor call to the
15060 current location, even though the destructor is going to be
15061 called later, at the end of the current scope. This can lead to
15062 a "jumpy" behavior for users of debuggers when they step around
15063 the end of the block. So let's unset the location of the
15064 destructor call instead. */
15065 protected_set_expr_location (cleanup, UNKNOWN_LOCATION);
15068 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl)))
15069 /* Treat objects with destructors as used; the destructor may do
15070 something substantive. */
15071 && !mark_used (decl, complain) && !(complain & tf_error))
15072 return error_mark_node;
15078 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
15079 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
15080 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
15083 static_fn_type (tree memfntype)
15088 if (TYPE_PTRMEMFUNC_P (memfntype))
15089 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
15090 if (POINTER_TYPE_P (memfntype)
15091 || TREE_CODE (memfntype) == FUNCTION_DECL)
15092 memfntype = TREE_TYPE (memfntype);
15093 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
15095 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
15096 args = TYPE_ARG_TYPES (memfntype);
15097 cp_ref_qualifier rqual = type_memfn_rqual (memfntype);
15098 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
15099 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype), rqual);
15100 fntype = (cp_build_type_attribute_variant
15101 (fntype, TYPE_ATTRIBUTES (memfntype)));
15102 fntype = (build_exception_variant
15103 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
15104 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype))
15105 TYPE_HAS_LATE_RETURN_TYPE (fntype) = 1;
15109 /* DECL was originally constructed as a non-static member function,
15110 but turned out to be static. Update it accordingly. */
15113 revert_static_member_fn (tree decl)
15115 tree stype = static_fn_type (decl);
15116 cp_cv_quals quals = type_memfn_quals (stype);
15117 cp_ref_qualifier rqual = type_memfn_rqual (stype);
15119 if (quals != TYPE_UNQUALIFIED || rqual != REF_QUAL_NONE)
15120 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED, REF_QUAL_NONE);
15122 TREE_TYPE (decl) = stype;
15124 if (DECL_ARGUMENTS (decl))
15125 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
15126 DECL_STATIC_FUNCTION_P (decl) = 1;
15129 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
15130 one of the language-independent trees. */
15132 enum cp_tree_node_structure_enum
15133 cp_tree_node_structure (union lang_tree_node * t)
15135 switch (TREE_CODE (&t->generic))
15137 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
15138 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
15139 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
15140 case OVERLOAD: return TS_CP_OVERLOAD;
15141 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
15142 case PTRMEM_CST: return TS_CP_PTRMEM;
15143 case BASELINK: return TS_CP_BASELINK;
15144 case TEMPLATE_DECL: return TS_CP_TEMPLATE_DECL;
15145 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
15146 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
15147 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
15148 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
15149 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
15150 case CONSTRAINT_INFO: return TS_CP_CONSTRAINT_INFO;
15151 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
15152 default: return TS_CP_GENERIC;
15156 /* Build the void_list_node (void_type_node having been created). */
15158 build_void_list_node (void)
15160 tree t = build_tree_list (NULL_TREE, void_type_node);
15165 cp_missing_noreturn_ok_p (tree decl)
15167 /* A missing noreturn is ok for the `main' function. */
15168 return DECL_MAIN_P (decl);
15171 /* Return the decl used to identify the COMDAT group into which DECL should
15175 cxx_comdat_group (tree decl)
15177 /* Virtual tables, construction virtual tables, and virtual table
15178 tables all go in a single COMDAT group, named after the primary
15180 if (VAR_P (decl) && DECL_VTABLE_OR_VTT_P (decl))
15181 decl = CLASSTYPE_VTABLES (DECL_CONTEXT (decl));
15182 /* For all other DECLs, the COMDAT group is the mangled name of the
15183 declaration itself. */
15186 while (DECL_THUNK_P (decl))
15188 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
15189 into the same section as the target function. In that case
15190 we must return target's name. */
15191 tree target = THUNK_TARGET (decl);
15192 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
15193 && DECL_SECTION_NAME (target) != NULL
15194 && DECL_ONE_ONLY (target))
15204 /* Returns the return type for FN as written by the user, which may include
15205 a placeholder for a deduced return type. */
15208 fndecl_declared_return_type (tree fn)
15210 fn = STRIP_TEMPLATE (fn);
15211 if (FNDECL_USED_AUTO (fn))
15213 struct language_function *f = NULL;
15214 if (DECL_STRUCT_FUNCTION (fn))
15215 f = DECL_STRUCT_FUNCTION (fn)->language;
15217 f = DECL_SAVED_FUNCTION_DATA (fn);
15218 return f->x_auto_return_pattern;
15220 return TREE_TYPE (TREE_TYPE (fn));
15223 /* Returns true iff DECL was declared with an auto return type and it has
15224 not yet been deduced to a real type. */
15227 undeduced_auto_decl (tree decl)
15229 if (cxx_dialect < cxx14)
15231 return type_uses_auto (TREE_TYPE (decl));
15234 /* Complain if DECL has an undeduced return type. */
15237 require_deduced_type (tree decl)
15239 if (undeduced_auto_decl (decl))
15240 error ("use of %qD before deduction of %<auto%>", decl);
15243 #include "gt-cp-decl.h"