1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* Process declarations and symbol lookup for C++ front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
32 #include "coretypes.h"
47 #include "tree-mudflap.h"
49 #include "tree-inline.h"
51 #include "tree-dump.h"
54 extern cpp_reader *parse_in;
56 /* This structure contains information about the initializations
57 and/or destructions required for a particular priority level. */
58 typedef struct priority_info_s {
59 /* Nonzero if there have been any initializations at this priority
60 throughout the translation unit. */
61 int initializations_p;
62 /* Nonzero if there have been any destructions at this priority
63 throughout the translation unit. */
67 static void mark_vtable_entries (tree);
68 static bool maybe_emit_vtables (tree);
69 static bool acceptable_java_type (tree);
70 static tree start_objects (int, int);
71 static void finish_objects (int, int, tree);
72 static tree start_static_storage_duration_function (unsigned);
73 static void finish_static_storage_duration_function (tree);
74 static priority_info get_priority_info (int);
75 static void do_static_initialization_or_destruction (tree, bool);
76 static void one_static_initialization_or_destruction (tree, tree, bool);
77 static void generate_ctor_or_dtor_function (bool, int, location_t *);
78 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
80 static tree prune_vars_needing_no_initialization (tree *);
81 static void write_out_vars (tree);
82 static void import_export_class (tree);
83 static tree get_guard_bits (tree);
84 static void determine_visibility_from_class (tree, tree);
86 /* A list of static class variables. This is needed, because a
87 static class variable can be declared inside the class without
88 an initializer, and then initialized, statically, outside the class. */
89 static GTY(()) VEC(tree,gc) *pending_statics;
91 /* A list of functions which were declared inline, but which we
92 may need to emit outline anyway. */
93 static GTY(()) VEC(tree,gc) *deferred_fns;
95 /* Nonzero if we're done parsing and into end-of-file activities. */
101 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
102 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
103 that apply to the function). */
106 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
111 if (fntype == error_mark_node || ctype == error_mark_node)
112 return error_mark_node;
114 type_quals = quals & ~TYPE_QUAL_RESTRICT;
115 ctype = cp_build_qualified_type (ctype, type_quals);
116 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
117 (TREE_CODE (fntype) == METHOD_TYPE
118 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
119 : TYPE_ARG_TYPES (fntype)));
120 raises = TYPE_RAISES_EXCEPTIONS (fntype);
122 fntype = build_exception_variant (fntype, raises);
127 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
131 cp_build_parm_decl (tree name, tree type)
133 tree parm = build_decl (PARM_DECL, name, type);
134 /* DECL_ARG_TYPE is only used by the back end and the back end never
136 if (!processing_template_decl)
137 DECL_ARG_TYPE (parm) = type_passed_as (type);
139 /* If the type is a pack expansion, then we have a function
141 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
142 FUNCTION_PARAMETER_PACK_P (parm) = 1;
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name, tree type)
153 tree parm = cp_build_parm_decl (name, type);
154 DECL_ARTIFICIAL (parm) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn)
177 tree basetype, arg_types, parms, parm, fntype;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
194 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
195 basetype = TREE_TYPE (TREE_VALUE (arg_types));
196 arg_types = TREE_CHAIN (arg_types);
198 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm) = parms;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
213 DECL_HAS_VTT_PARM_P (fn) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
218 TREE_CHAIN (parm) = parms;
220 arg_types = hash_tree_chain (integer_type_node, arg_types);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
225 /* And rebuild the function type. */
226 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
229 fntype = build_exception_variant (fntype,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
231 TREE_TYPE (fn) = fntype;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype, tree function, enum overload_flags flags)
260 tree fn_name = DECL_NAME (function);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function, lang_cplusplus);
266 if (fn_name == NULL_TREE)
268 error ("name missing for member function");
269 fn_name = get_identifier ("<anonymous>");
270 DECL_NAME (function) = fn_name;
273 DECL_CONTEXT (function) = ctype;
275 if (flags == DTOR_FLAG)
276 DECL_DESTRUCTOR_P (function) = 1;
278 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
279 maybe_retrofit_in_chrg (function);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr, tree index_exp)
290 tree orig_array_expr = array_expr;
291 tree orig_index_exp = index_exp;
293 if (error_operand_p (array_expr) || error_operand_p (index_exp))
294 return error_mark_node;
296 if (processing_template_decl)
298 if (type_dependent_expression_p (array_expr)
299 || type_dependent_expression_p (index_exp))
300 return build_min_nt (ARRAY_REF, array_expr, index_exp,
301 NULL_TREE, NULL_TREE);
302 array_expr = build_non_dependent_expr (array_expr);
303 index_exp = build_non_dependent_expr (index_exp);
306 type = TREE_TYPE (array_expr);
308 type = non_reference (type);
310 /* If they have an `operator[]', use that. */
311 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type) == ARRAY_TYPE)
326 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
328 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
331 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
333 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
335 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
338 if ((p1 && i2) && (i1 && p2))
339 error ("ambiguous conversion for array subscript");
342 array_expr = p1, index_exp = i2;
344 array_expr = p2, index_exp = i1;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type, TREE_TYPE (index_exp));
349 return error_mark_node;
352 if (array_expr == error_mark_node || index_exp == error_mark_node)
353 error ("ambiguous conversion for array subscript");
355 expr = build_array_ref (array_expr, index_exp);
357 if (processing_template_decl && expr != error_mark_node)
358 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
359 NULL_TREE, NULL_TREE);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
375 if (exp == error_mark_node)
378 if (processing_template_decl)
380 t = build_min (DELETE_EXPR, void_type_node, exp, size);
381 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
382 DELETE_EXPR_USE_VEC (t) = doing_vec;
383 TREE_SIDE_EFFECTS (t) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
390 warning (0, "deleting array %q#D", exp);
392 t = build_expr_type_conversion (WANT_POINTER, exp, true);
394 if (t == NULL_TREE || t == error_mark_node)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node;
401 type = TREE_TYPE (t);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
416 warning (0, "deleting %qT is undefined", type);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t))
422 return build1 (NOP_EXPR, void_type_node, t);
425 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
426 sfk_deleting_destructor,
429 return build_delete (type, t, sfk_deleting_destructor,
430 LOOKUP_NORMAL, use_global_delete);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl)
441 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
442 decl = DECL_TEMPLATE_RESULT (tmpl);
444 if (TREE_CODE (decl) == FUNCTION_DECL
445 || (TREE_CODE (decl) == TYPE_DECL
446 && IS_AGGR_TYPE (TREE_TYPE (decl))))
448 /* The parser rejects template declarations in local classes. */
449 gcc_assert (!current_function_decl);
450 /* The parser rejects any use of virtual in a function template. */
451 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
452 && DECL_VIRTUAL_P (decl)));
454 /* The debug-information generating code doesn't know what to do
455 with member templates. */
456 DECL_IGNORED_P (tmpl) = 1;
459 error ("template declaration of %q#D", decl);
462 /* Return true iff TYPE is a valid Java parameter or return type. */
465 acceptable_java_type (tree type)
467 if (type == error_mark_node)
470 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
472 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
474 type = TREE_TYPE (type);
475 if (TREE_CODE (type) == RECORD_TYPE)
478 if (! TYPE_FOR_JAVA (type))
480 if (! CLASSTYPE_TEMPLATE_INFO (type))
482 args = CLASSTYPE_TI_ARGS (type);
483 i = TREE_VEC_LENGTH (args);
486 type = TREE_VEC_ELT (args, i);
487 if (TREE_CODE (type) == POINTER_TYPE)
488 type = TREE_TYPE (type);
489 if (! TYPE_FOR_JAVA (type))
498 /* For a METHOD in a Java class CTYPE, return true if
499 the parameter and return types are valid Java types.
500 Otherwise, print appropriate error messages, and return false. */
503 check_java_method (tree method)
506 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
507 tree ret_type = TREE_TYPE (TREE_TYPE (method));
509 if (!acceptable_java_type (ret_type))
511 error ("Java method %qD has non-Java return type %qT",
516 arg_types = TREE_CHAIN (arg_types);
517 if (DECL_HAS_IN_CHARGE_PARM_P (method))
518 arg_types = TREE_CHAIN (arg_types);
519 if (DECL_HAS_VTT_PARM_P (method))
520 arg_types = TREE_CHAIN (arg_types);
522 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
524 tree type = TREE_VALUE (arg_types);
525 if (!acceptable_java_type (type))
527 if (type != error_mark_node)
528 error ("Java method %qD has non-Java parameter type %qT",
536 /* Sanity check: report error if this function FUNCTION is not
537 really a member of the class (CTYPE) it is supposed to belong to.
538 TEMPLATE_PARMS is used to specify the template parameters of a member
539 template passed as FUNCTION_DECL. If the member template is passed as a
540 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
541 from the declaration. If the function is not a function template, it
543 It returns the original declaration for the function, NULL_TREE if
544 no declaration was found, error_mark_node if an error was emitted. */
547 check_classfn (tree ctype, tree function, tree template_parms)
553 if (DECL_USE_TEMPLATE (function)
554 && !(TREE_CODE (function) == TEMPLATE_DECL
555 && DECL_TEMPLATE_SPECIALIZATION (function))
556 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
557 /* Since this is a specialization of a member template,
558 we're not going to find the declaration in the class.
561 struct S { template <typename T> void f(T); };
562 template <> void S::f(int);
564 we're not going to find `S::f(int)', but there's no
565 reason we should, either. We let our callers know we didn't
566 find the method, but we don't complain. */
569 /* Basic sanity check: for a template function, the template parameters
570 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
571 if (TREE_CODE (function) == TEMPLATE_DECL)
573 gcc_assert (!template_parms
574 || comp_template_parms (template_parms,
575 DECL_TEMPLATE_PARMS (function)));
576 template_parms = DECL_TEMPLATE_PARMS (function);
579 /* OK, is this a definition of a member template? */
580 is_template = (template_parms != NULL_TREE);
582 /* We must enter the scope here, because conversion operators are
583 named by target type, and type equivalence relies on typenames
584 resolving within the scope of CTYPE. */
585 pushed_scope = push_scope (ctype);
586 ix = class_method_index_for_fn (complete_type (ctype), function);
589 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
590 tree fndecls, fndecl = 0;
592 const char *format = NULL;
594 for (fndecls = VEC_index (tree, methods, ix);
595 fndecls; fndecls = OVL_NEXT (fndecls))
599 fndecl = OVL_CURRENT (fndecls);
600 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
601 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
603 /* We cannot simply call decls_match because this doesn't
604 work for static member functions that are pretending to
605 be methods, and because the name may have been changed by
608 /* Get rid of the this parameter on functions that become
610 if (DECL_STATIC_FUNCTION_P (fndecl)
611 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
612 p1 = TREE_CHAIN (p1);
614 /* A member template definition only matches a member template
616 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
619 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
620 TREE_TYPE (TREE_TYPE (fndecl)))
621 && compparms (p1, p2)
623 || comp_template_parms (template_parms,
624 DECL_TEMPLATE_PARMS (fndecl)))
625 && (DECL_TEMPLATE_SPECIALIZATION (function)
626 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
627 && (!DECL_TEMPLATE_SPECIALIZATION (function)
628 || (DECL_TI_TEMPLATE (function)
629 == DECL_TI_TEMPLATE (fndecl))))
635 pop_scope (pushed_scope);
636 return OVL_CURRENT (fndecls);
639 error ("prototype for %q#D does not match any in class %qT",
641 is_conv_op = DECL_CONV_FN_P (fndecl);
644 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
645 fndecls = VEC_index (tree, methods, ix);
648 fndecl = OVL_CURRENT (fndecls);
649 fndecls = OVL_NEXT (fndecls);
651 if (!fndecls && is_conv_op)
653 if (VEC_length (tree, methods) > (size_t) ++ix)
655 fndecls = VEC_index (tree, methods, ix);
656 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
668 format = N_("candidates are: %+#D");
670 format = N_("candidate is: %+#D");
671 error (format, fndecl);
674 else if (!COMPLETE_TYPE_P (ctype))
675 cxx_incomplete_type_error (function, ctype);
677 error ("no %q#D member function declared in class %qT",
681 pop_scope (pushed_scope);
682 return error_mark_node;
685 /* DECL is a function with vague linkage. Remember it so that at the
686 end of the translation unit we can decide whether or not to emit
690 note_vague_linkage_fn (tree decl)
692 if (!DECL_DEFERRED_FN (decl))
694 DECL_DEFERRED_FN (decl) = 1;
695 DECL_DEFER_OUTPUT (decl) = 1;
696 VEC_safe_push (tree, gc, deferred_fns, decl);
700 /* We have just processed the DECL, which is a static data member.
701 The other parameters are as for cp_finish_decl. */
704 finish_static_data_member_decl (tree decl,
705 tree init, bool init_const_expr_p,
709 DECL_CONTEXT (decl) = current_class_type;
711 /* We cannot call pushdecl here, because that would fill in the
712 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
713 the right thing, namely, to put this decl out straight away. */
715 if (! processing_template_decl)
716 VEC_safe_push (tree, gc, pending_statics, decl);
718 if (LOCAL_CLASS_P (current_class_type))
719 pedwarn ("local class %q#T shall not have static data member %q#D",
720 current_class_type, decl);
722 /* Static consts need not be initialized in the class definition. */
723 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
725 static int explained = 0;
727 error ("initializer invalid for static member with constructor");
730 error ("(an out of class initialization is required)");
735 /* Force the compiler to know when an uninitialized static const
736 member is being used. */
737 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
738 TREE_USED (decl) = 1;
739 DECL_INITIAL (decl) = init;
740 DECL_IN_AGGR_P (decl) = 1;
742 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
745 /* DECLARATOR and DECLSPECS correspond to a class member. The other
746 parameters are as for cp_finish_decl. Return the DECL for the
747 class member declared. */
750 grokfield (const cp_declarator *declarator,
751 cp_decl_specifier_seq *declspecs,
752 tree init, bool init_const_expr_p,
757 const char *asmspec = 0;
758 int flags = LOOKUP_ONLYCONVERTING;
761 && TREE_CODE (init) == TREE_LIST
762 && TREE_VALUE (init) == error_mark_node
763 && TREE_CHAIN (init) == NULL_TREE)
766 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
767 if (! value || error_operand_p (value))
768 /* friend or constructor went bad. */
769 return error_mark_node;
771 if (TREE_CODE (value) == TYPE_DECL && init)
773 error ("typedef %qD is initialized (use __typeof__ instead)", value);
777 /* Pass friendly classes back. */
778 if (value == void_type_node)
781 /* Pass friend decls back. */
782 if ((TREE_CODE (value) == FUNCTION_DECL
783 || TREE_CODE (value) == TEMPLATE_DECL)
784 && DECL_CONTEXT (value) != current_class_type)
787 if (DECL_NAME (value) != NULL_TREE
788 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
789 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
790 error ("member %qD conflicts with virtual function table field name",
793 /* Stash away type declarations. */
794 if (TREE_CODE (value) == TYPE_DECL)
796 DECL_NONLOCAL (value) = 1;
797 DECL_CONTEXT (value) = current_class_type;
799 if (processing_template_decl)
800 value = push_template_decl (value);
803 cplus_decl_attributes (&value, attrlist, 0);
808 if (DECL_IN_AGGR_P (value))
810 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
811 return void_type_node;
814 if (asmspec_tree && asmspec_tree != error_mark_node)
815 asmspec = TREE_STRING_POINTER (asmspec_tree);
819 if (TREE_CODE (value) == FUNCTION_DECL)
821 /* Initializers for functions are rejected early in the parser.
822 If we get here, it must be a pure specifier for a method. */
823 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
825 gcc_assert (error_operand_p (init) || integer_zerop (init));
826 DECL_PURE_VIRTUAL_P (value) = 1;
830 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
831 error ("initializer specified for static member function %qD",
835 else if (pedantic && TREE_CODE (value) != VAR_DECL)
836 /* Already complained in grokdeclarator. */
838 else if (!processing_template_decl)
840 if (TREE_CODE (init) == CONSTRUCTOR)
841 init = digest_init (TREE_TYPE (value), init);
843 init = integral_constant_value (init);
845 if (init != error_mark_node && !TREE_CONSTANT (init))
847 /* We can allow references to things that are effectively
848 static, since references are initialized with the
850 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
851 || (TREE_STATIC (init) == 0
852 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
854 error ("field initializer is not constant");
855 init = error_mark_node;
861 if (processing_template_decl
862 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
864 value = push_template_decl (value);
865 if (error_operand_p (value))
866 return error_mark_node;
870 cplus_decl_attributes (&value, attrlist, 0);
872 switch (TREE_CODE (value))
875 finish_static_data_member_decl (value, init, init_const_expr_p,
876 asmspec_tree, flags);
881 error ("%<asm%> specifiers are not permitted on non-static data members");
882 if (DECL_INITIAL (value) == error_mark_node)
883 init = error_mark_node;
884 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
886 DECL_INITIAL (value) = init;
887 DECL_IN_AGGR_P (value) = 1;
892 set_user_assembler_name (value, asmspec);
894 cp_finish_decl (value,
896 /*init_const_expr_p=*/false,
897 asmspec_tree, flags);
899 /* Pass friends back this way. */
900 if (DECL_FRIEND_P (value))
901 return void_type_node;
903 DECL_IN_AGGR_P (value) = 1;
912 /* Like `grokfield', but for bitfields.
913 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
916 grokbitfield (const cp_declarator *declarator,
917 cp_decl_specifier_seq *declspecs, tree width)
919 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
921 if (value == error_mark_node)
922 return NULL_TREE; /* friends went bad. */
924 /* Pass friendly classes back. */
925 if (TREE_CODE (value) == VOID_TYPE)
926 return void_type_node;
928 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
929 && (POINTER_TYPE_P (value)
930 || !dependent_type_p (TREE_TYPE (value))))
932 error ("bit-field %qD with non-integral type", value);
933 return error_mark_node;
936 if (TREE_CODE (value) == TYPE_DECL)
938 error ("cannot declare %qD to be a bit-field type", value);
942 /* Usually, finish_struct_1 catches bitfields with invalid types.
943 But, in the case of bitfields with function type, we confuse
944 ourselves into thinking they are member functions, so we must
946 if (TREE_CODE (value) == FUNCTION_DECL)
948 error ("cannot declare bit-field %qD with function type",
953 if (DECL_IN_AGGR_P (value))
955 error ("%qD is already defined in the class %qT", value,
956 DECL_CONTEXT (value));
957 return void_type_node;
960 if (TREE_STATIC (value))
962 error ("static member %qD cannot be a bit-field", value);
965 finish_decl (value, NULL_TREE, NULL_TREE);
967 if (width != error_mark_node)
969 constant_expression_warning (width);
970 DECL_INITIAL (value) = width;
971 SET_DECL_C_BIT_FIELD (value);
974 DECL_IN_AGGR_P (value) = 1;
979 /* Returns true iff ATTR is an attribute which needs to be applied at
980 instantiation time rather than template definition time. */
983 is_late_template_attribute (tree attr, tree decl)
985 tree name = TREE_PURPOSE (attr);
986 tree args = TREE_VALUE (attr);
987 const struct attribute_spec *spec = lookup_attribute_spec (name);
991 /* Unknown attribute. */
994 /* If any of the arguments are dependent expressions, we can't evaluate
995 the attribute until instantiation time. */
996 for (arg = args; arg; arg = TREE_CHAIN (arg))
998 tree t = TREE_VALUE (arg);
999 if (value_dependent_expression_p (t)
1000 || type_dependent_expression_p (t))
1004 if (TREE_CODE (decl) == TYPE_DECL
1006 || spec->type_required)
1008 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1010 /* We can't apply any attributes to a completely unknown type until
1011 instantiation time. */
1012 enum tree_code code = TREE_CODE (type);
1013 if (code == TEMPLATE_TYPE_PARM
1014 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1015 || code == TYPENAME_TYPE)
1017 /* Also defer most attributes on dependent types. This is not
1018 necessary in all cases, but is the better default. */
1019 else if (dependent_type_p (type)
1020 /* But attribute visibility specifically works on
1022 && !is_attribute_p ("visibility", name))
1031 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1032 applied at instantiation time and return them. If IS_DEPENDENT is true,
1033 the declaration itself is dependent, so all attributes should be applied
1034 at instantiation time. */
1037 splice_template_attributes (tree *attr_p, tree decl)
1040 tree late_attrs = NULL_TREE;
1041 tree *q = &late_attrs;
1048 if (is_late_template_attribute (*p, decl))
1050 ATTR_IS_DEPENDENT (*p) = 1;
1052 *p = TREE_CHAIN (*p);
1053 q = &TREE_CHAIN (*q);
1057 p = &TREE_CHAIN (*p);
1063 /* Remove any late attributes from the list in ATTR_P and attach them to
1067 save_template_attributes (tree *attr_p, tree *decl_p)
1069 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1075 /* Give this type a name so we know to look it up again at instantiation
1077 if (TREE_CODE (*decl_p) == TYPE_DECL
1078 && DECL_ORIGINAL_TYPE (*decl_p) == NULL_TREE)
1080 tree oldt = TREE_TYPE (*decl_p);
1081 tree newt = build_variant_type_copy (oldt);
1082 DECL_ORIGINAL_TYPE (*decl_p) = oldt;
1083 TREE_TYPE (*decl_p) = newt;
1084 TYPE_NAME (newt) = *decl_p;
1085 TREE_USED (newt) = TREE_USED (*decl_p);
1088 if (DECL_P (*decl_p))
1089 q = &DECL_ATTRIBUTES (*decl_p);
1091 q = &TYPE_ATTRIBUTES (*decl_p);
1094 q = &TREE_CHAIN (tree_last (*q));
1098 /* Like decl_attributes, but handle C++ complexity. */
1101 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1103 if (*decl == NULL_TREE || *decl == void_type_node
1104 || *decl == error_mark_node
1105 || attributes == NULL_TREE)
1108 if (processing_template_decl)
1110 save_template_attributes (&attributes, decl);
1111 if (attributes == NULL_TREE)
1115 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1116 decl = &DECL_TEMPLATE_RESULT (*decl);
1118 decl_attributes (decl, attributes, flags);
1120 if (TREE_CODE (*decl) == TYPE_DECL)
1121 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1124 /* Walks through the namespace- or function-scope anonymous union
1125 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1126 Returns one of the fields for use in the mangled name. */
1129 build_anon_union_vars (tree type, tree object)
1131 tree main_decl = NULL_TREE;
1134 /* Rather than write the code to handle the non-union case,
1135 just give an error. */
1136 if (TREE_CODE (type) != UNION_TYPE)
1137 error ("anonymous struct not inside named type");
1139 for (field = TYPE_FIELDS (type);
1141 field = TREE_CHAIN (field))
1146 if (DECL_ARTIFICIAL (field))
1148 if (TREE_CODE (field) != FIELD_DECL)
1150 pedwarn ("%q+#D invalid; an anonymous union can only "
1151 "have non-static data members", field);
1155 if (TREE_PRIVATE (field))
1156 pedwarn ("private member %q+#D in anonymous union", field);
1157 else if (TREE_PROTECTED (field))
1158 pedwarn ("protected member %q+#D in anonymous union", field);
1160 if (processing_template_decl)
1161 ref = build_min_nt (COMPONENT_REF, object,
1162 DECL_NAME (field), NULL_TREE);
1164 ref = build_class_member_access_expr (object, field, NULL_TREE,
1167 if (DECL_NAME (field))
1171 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1172 DECL_ANON_UNION_VAR_P (decl) = 1;
1174 base = get_base_address (object);
1175 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1176 TREE_STATIC (decl) = TREE_STATIC (base);
1177 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1179 SET_DECL_VALUE_EXPR (decl, ref);
1180 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1182 decl = pushdecl (decl);
1184 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1185 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1189 if (main_decl == NULL_TREE)
1196 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1197 anonymous union, then all members must be laid out together. PUBLIC_P
1198 is nonzero if this union is not declared static. */
1201 finish_anon_union (tree anon_union_decl)
1207 if (anon_union_decl == error_mark_node)
1210 type = TREE_TYPE (anon_union_decl);
1211 public_p = TREE_PUBLIC (anon_union_decl);
1213 /* The VAR_DECL's context is the same as the TYPE's context. */
1214 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1216 if (TYPE_FIELDS (type) == NULL_TREE)
1221 error ("namespace-scope anonymous aggregates must be static");
1225 main_decl = build_anon_union_vars (type, anon_union_decl);
1226 if (main_decl == error_mark_node)
1228 if (main_decl == NULL_TREE)
1230 warning (0, "anonymous union with no members");
1234 if (!processing_template_decl)
1236 /* Use main_decl to set the mangled name. */
1237 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1238 mangle_decl (anon_union_decl);
1239 DECL_NAME (anon_union_decl) = NULL_TREE;
1242 pushdecl (anon_union_decl);
1243 if (building_stmt_tree ()
1244 && at_function_scope_p ())
1245 add_decl_expr (anon_union_decl);
1246 else if (!processing_template_decl)
1247 rest_of_decl_compilation (anon_union_decl,
1248 toplevel_bindings_p (), at_eof);
1251 /* Auxiliary functions to make type signatures for
1252 `operator new' and `operator delete' correspond to
1253 what compiler will be expecting. */
1256 coerce_new_type (tree type)
1259 tree args = TYPE_ARG_TYPES (type);
1261 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1263 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1266 error ("%<operator new%> must return type %qT", ptr_type_node);
1269 if (args && args != void_list_node)
1271 if (TREE_PURPOSE (args))
1273 /* [basic.stc.dynamic.allocation]
1275 The first parameter shall not have an associated default
1277 error ("the first parameter of %<operator new%> cannot "
1278 "have a default argument");
1279 /* Throw away the default argument. */
1280 TREE_PURPOSE (args) = NULL_TREE;
1283 if (!same_type_p (TREE_VALUE (args), size_type_node))
1286 args = TREE_CHAIN (args);
1293 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1294 "as first parameter", size_type_node);
1299 args = tree_cons (NULL_TREE, size_type_node, args);
1302 type = build_exception_variant
1303 (build_function_type (ptr_type_node, args),
1304 TYPE_RAISES_EXCEPTIONS (type));
1312 coerce_delete_type (tree type)
1315 tree args = TYPE_ARG_TYPES (type);
1317 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1319 if (!same_type_p (TREE_TYPE (type), void_type_node))
1322 error ("%<operator delete%> must return type %qT", void_type_node);
1325 if (!args || args == void_list_node
1326 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1329 if (args && args != void_list_node)
1330 args = TREE_CHAIN (args);
1331 error ("%<operator delete%> takes type %qT as first parameter",
1337 args = tree_cons (NULL_TREE, ptr_type_node, args);
1340 type = build_exception_variant
1341 (build_function_type (void_type_node, args),
1342 TYPE_RAISES_EXCEPTIONS (type));
1350 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1351 and mark them as needed. */
1354 mark_vtable_entries (tree decl)
1357 unsigned HOST_WIDE_INT idx;
1359 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1364 STRIP_NOPS (fnaddr);
1366 if (TREE_CODE (fnaddr) != ADDR_EXPR
1367 && TREE_CODE (fnaddr) != FDESC_EXPR)
1368 /* This entry is an offset: a virtual base class offset, a
1369 virtual call offset, an RTTI offset, etc. */
1372 fn = TREE_OPERAND (fnaddr, 0);
1373 TREE_ADDRESSABLE (fn) = 1;
1374 /* When we don't have vcall offsets, we output thunks whenever
1375 we output the vtables that contain them. With vcall offsets,
1376 we know all the thunks we'll need when we emit a virtual
1377 function, so we emit the thunks there instead. */
1378 if (DECL_THUNK_P (fn))
1379 use_thunk (fn, /*emit_p=*/0);
1384 /* Set DECL up to have the closest approximation of "initialized common"
1385 linkage available. */
1388 comdat_linkage (tree decl)
1391 make_decl_one_only (decl);
1392 else if (TREE_CODE (decl) == FUNCTION_DECL
1393 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1394 /* We can just emit function and compiler-generated variables
1395 statically; having multiple copies is (for the most part) only
1398 There are two correctness issues, however: the address of a
1399 template instantiation with external linkage should be the
1400 same, independent of what translation unit asks for the
1401 address, and this will not hold when we emit multiple copies of
1402 the function. However, there's little else we can do.
1404 Also, by default, the typeinfo implementation assumes that
1405 there will be only one copy of the string used as the name for
1406 each type. Therefore, if weak symbols are unavailable, the
1407 run-time library should perform a more conservative check; it
1408 should perform a string comparison, rather than an address
1410 TREE_PUBLIC (decl) = 0;
1413 /* Static data member template instantiations, however, cannot
1414 have multiple copies. */
1415 if (DECL_INITIAL (decl) == 0
1416 || DECL_INITIAL (decl) == error_mark_node)
1417 DECL_COMMON (decl) = 1;
1418 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1420 DECL_COMMON (decl) = 1;
1421 DECL_INITIAL (decl) = error_mark_node;
1423 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1425 /* We can't do anything useful; leave vars for explicit
1427 DECL_EXTERNAL (decl) = 1;
1428 DECL_NOT_REALLY_EXTERN (decl) = 0;
1432 if (DECL_LANG_SPECIFIC (decl))
1433 DECL_COMDAT (decl) = 1;
1436 /* For win32 we also want to put explicit instantiations in
1437 linkonce sections, so that they will be merged with implicit
1438 instantiations; otherwise we get duplicate symbol errors.
1439 For Darwin we do not want explicit instantiations to be
1443 maybe_make_one_only (tree decl)
1445 /* We used to say that this was not necessary on targets that support weak
1446 symbols, because the implicit instantiations will defer to the explicit
1447 one. However, that's not actually the case in SVR4; a strong definition
1448 after a weak one is an error. Also, not making explicit
1449 instantiations one_only means that we can end up with two copies of
1450 some template instantiations. */
1454 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1455 we can get away with not emitting them if they aren't used. We need
1456 to for variables so that cp_finish_decl will update their linkage,
1457 because their DECL_INITIAL may not have been set properly yet. */
1459 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1460 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1461 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1463 make_decl_one_only (decl);
1465 if (TREE_CODE (decl) == VAR_DECL)
1467 DECL_COMDAT (decl) = 1;
1468 /* Mark it needed so we don't forget to emit it. */
1469 mark_decl_referenced (decl);
1474 /* Determine whether or not we want to specifically import or export CTYPE,
1475 using various heuristics. */
1478 import_export_class (tree ctype)
1480 /* -1 for imported, 1 for exported. */
1481 int import_export = 0;
1483 /* It only makes sense to call this function at EOF. The reason is
1484 that this function looks at whether or not the first non-inline
1485 non-abstract virtual member function has been defined in this
1486 translation unit. But, we can't possibly know that until we've
1487 seen the entire translation unit. */
1488 gcc_assert (at_eof);
1490 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1493 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1494 we will have CLASSTYPE_INTERFACE_ONLY set but not
1495 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1496 heuristic because someone will supply a #pragma implementation
1497 elsewhere, and deducing it here would produce a conflict. */
1498 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1501 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1503 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1505 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1506 && !flag_implicit_templates)
1507 /* For a template class, without -fimplicit-templates, check the
1508 repository. If the virtual table is assigned to this
1509 translation unit, then export the class; otherwise, import
1511 import_export = repo_export_class_p (ctype) ? 1 : -1;
1512 else if (TYPE_POLYMORPHIC_P (ctype))
1514 /* The ABI specifies that the virtual table and associated
1515 information are emitted with the key method, if any. */
1516 tree method = CLASSTYPE_KEY_METHOD (ctype);
1517 /* If weak symbol support is not available, then we must be
1518 careful not to emit the vtable when the key function is
1519 inline. An inline function can be defined in multiple
1520 translation units. If we were to emit the vtable in each
1521 translation unit containing a definition, we would get
1522 multiple definition errors at link-time. */
1523 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1524 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1527 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1528 a definition anywhere else. */
1529 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1532 /* Allow back ends the chance to overrule the decision. */
1533 if (targetm.cxx.import_export_class)
1534 import_export = targetm.cxx.import_export_class (ctype, import_export);
1538 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1539 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1543 /* Return true if VAR has already been provided to the back end; in that
1544 case VAR should not be modified further by the front end. */
1546 var_finalized_p (tree var)
1548 return varpool_node (var)->finalized;
1551 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1552 must be emitted in this translation unit. Mark it as such. */
1555 mark_needed (tree decl)
1557 /* It's possible that we no longer need to set
1558 TREE_SYMBOL_REFERENCED here directly, but doing so is
1560 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1561 mark_decl_referenced (decl);
1564 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1565 returns true if a definition of this entity should be provided in
1566 this object file. Callers use this function to determine whether
1567 or not to let the back end know that a definition of DECL is
1568 available in this translation unit. */
1571 decl_needed_p (tree decl)
1573 gcc_assert (TREE_CODE (decl) == VAR_DECL
1574 || TREE_CODE (decl) == FUNCTION_DECL);
1575 /* This function should only be called at the end of the translation
1576 unit. We cannot be sure of whether or not something will be
1577 COMDAT until that point. */
1578 gcc_assert (at_eof);
1580 /* All entities with external linkage that are not COMDAT should be
1581 emitted; they may be referred to from other object files. */
1582 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1584 /* If this entity was used, let the back end see it; it will decide
1585 whether or not to emit it into the object file. */
1586 if (TREE_USED (decl)
1587 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1588 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1590 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1591 reference to DECL might cause it to be emitted later. */
1595 /* If necessary, write out the vtables for the dynamic class CTYPE.
1596 Returns true if any vtables were emitted. */
1599 maybe_emit_vtables (tree ctype)
1605 /* If the vtables for this class have already been emitted there is
1606 nothing more to do. */
1607 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1608 if (var_finalized_p (primary_vtbl))
1610 /* Ignore dummy vtables made by get_vtable_decl. */
1611 if (TREE_TYPE (primary_vtbl) == void_type_node)
1614 /* On some targets, we cannot determine the key method until the end
1615 of the translation unit -- which is when this function is
1617 if (!targetm.cxx.key_method_may_be_inline ())
1618 determine_key_method (ctype);
1620 /* See if any of the vtables are needed. */
1621 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1623 import_export_decl (vtbl);
1624 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1629 /* If the references to this class' vtables are optimized away,
1630 still emit the appropriate debugging information. See
1632 if (DECL_COMDAT (primary_vtbl)
1633 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1634 note_debug_info_needed (ctype);
1638 /* The ABI requires that we emit all of the vtables if we emit any
1640 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1642 /* Mark entities references from the virtual table as used. */
1643 mark_vtable_entries (vtbl);
1645 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1647 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1649 /* It had better be all done at compile-time. */
1654 DECL_EXTERNAL (vtbl) = 0;
1655 rest_of_decl_compilation (vtbl, 1, 1);
1657 /* Because we're only doing syntax-checking, we'll never end up
1658 actually marking the variable as written. */
1659 if (flag_syntax_only)
1660 TREE_ASM_WRITTEN (vtbl) = 1;
1663 /* Since we're writing out the vtable here, also write the debug
1665 note_debug_info_needed (ctype);
1670 /* A special return value from type_visibility meaning internal
1673 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1675 /* walk_tree helper function for type_visibility. */
1678 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1680 int *vis_p = (int *)data;
1685 else if (CLASS_TYPE_P (*tp))
1687 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1689 *vis_p = VISIBILITY_ANON;
1692 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1693 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1698 /* Returns the visibility of TYPE, which is the minimum visibility of its
1702 type_visibility (tree type)
1704 int vis = VISIBILITY_DEFAULT;
1705 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1709 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1710 specified (or if VISIBILITY is static). */
1713 constrain_visibility (tree decl, int visibility)
1715 if (visibility == VISIBILITY_ANON)
1717 /* extern "C" declarations aren't affected by the anonymous
1719 if (!DECL_EXTERN_C_P (decl))
1721 TREE_PUBLIC (decl) = 0;
1722 DECL_ONE_ONLY (decl) = 0;
1723 DECL_INTERFACE_KNOWN (decl) = 1;
1724 if (DECL_LANG_SPECIFIC (decl))
1725 DECL_NOT_REALLY_EXTERN (decl) = 1;
1728 else if (visibility > DECL_VISIBILITY (decl)
1729 && !DECL_VISIBILITY_SPECIFIED (decl))
1731 DECL_VISIBILITY (decl) = visibility;
1737 /* Constrain the visibility of DECL based on the visibility of its template
1741 constrain_visibility_for_template (tree decl, tree targs)
1743 /* If this is a template instantiation, check the innermost
1744 template args for visibility constraints. The outer template
1745 args are covered by the class check. */
1746 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1748 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1752 tree arg = TREE_VEC_ELT (args, i-1);
1754 vis = type_visibility (arg);
1755 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1758 if (TREE_CODE (arg) == ADDR_EXPR)
1759 arg = TREE_OPERAND (arg, 0);
1760 if (TREE_CODE (arg) == VAR_DECL
1761 || TREE_CODE (arg) == FUNCTION_DECL)
1763 if (! TREE_PUBLIC (arg))
1764 vis = VISIBILITY_ANON;
1766 vis = DECL_VISIBILITY (arg);
1770 constrain_visibility (decl, vis);
1774 /* Like c_determine_visibility, but with additional C++-specific
1777 Function-scope entities can rely on the function's visibility because
1778 it is set in start_preparsed_function.
1780 Class-scope entities cannot rely on the class's visibility until the end
1781 of the enclosing class definition.
1783 Note that because namespaces have multiple independent definitions,
1784 namespace visibility is handled elsewhere using the #pragma visibility
1785 machinery rather than by decorating the namespace declaration.
1787 The goal is for constraints from the type to give a diagnostic, and
1788 other constraints to be applied silently. */
1791 determine_visibility (tree decl)
1793 tree class_type = NULL_TREE;
1796 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1798 /* Only relevant for names with external linkage. */
1799 if (!TREE_PUBLIC (decl))
1802 /* Cloned constructors and destructors get the same visibility as
1803 the underlying function. That should be set up in
1804 maybe_clone_body. */
1805 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1807 if (TREE_CODE (decl) == TYPE_DECL)
1809 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1810 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1811 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1816 else if (DECL_LANG_SPECIFIC (decl))
1817 use_template = DECL_USE_TEMPLATE (decl);
1821 /* If DECL is a member of a class, visibility specifiers on the
1822 class can influence the visibility of the DECL. */
1823 if (DECL_CLASS_SCOPE_P (decl))
1824 class_type = DECL_CONTEXT (decl);
1827 /* Not a class member. */
1829 /* Virtual tables have DECL_CONTEXT set to their associated class,
1830 so they are automatically handled above. */
1831 gcc_assert (TREE_CODE (decl) != VAR_DECL
1832 || !DECL_VTABLE_OR_VTT_P (decl));
1834 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1836 /* Local statics and classes get the visibility of their
1837 containing function by default, except that
1838 -fvisibility-inlines-hidden doesn't affect them. */
1839 tree fn = DECL_CONTEXT (decl);
1840 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1842 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1843 DECL_VISIBILITY_SPECIFIED (decl) =
1844 DECL_VISIBILITY_SPECIFIED (fn);
1847 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1849 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1850 but have no TEMPLATE_INFO, so don't try to check it. */
1853 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1854 && flag_visibility_ms_compat)
1856 /* Under -fvisibility-ms-compat, types are visible by default,
1857 even though their contents aren't. */
1858 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1859 int underlying_vis = type_visibility (underlying_type);
1860 if (underlying_vis == VISIBILITY_ANON
1861 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1862 constrain_visibility (decl, underlying_vis);
1864 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1866 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1868 /* tinfo visibility is based on the type it's for. */
1869 constrain_visibility
1870 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1872 else if (use_template)
1873 /* Template instantiations and specializations get visibility based
1874 on their template unless they override it with an attribute. */;
1875 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1877 /* Set default visibility to whatever the user supplied with
1878 #pragma GCC visibility or a namespace visibility attribute. */
1879 DECL_VISIBILITY (decl) = default_visibility;
1880 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1886 /* If the specialization doesn't specify visibility, use the
1887 visibility from the template. */
1888 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1889 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1890 : DECL_TEMPLATE_INFO (decl));
1891 tree args = TI_ARGS (tinfo);
1893 if (args != error_mark_node)
1895 int depth = TMPL_ARGS_DEPTH (args);
1896 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1898 if (!DECL_VISIBILITY_SPECIFIED (decl))
1900 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1901 DECL_VISIBILITY_SPECIFIED (decl)
1902 = DECL_VISIBILITY_SPECIFIED (pattern);
1905 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1906 if (args && depth > template_class_depth (class_type))
1907 /* Limit visibility based on its template arguments. */
1908 constrain_visibility_for_template (decl, args);
1913 determine_visibility_from_class (decl, class_type);
1915 if (decl_anon_ns_mem_p (decl))
1916 /* Names in an anonymous namespace get internal linkage.
1917 This might change once we implement export. */
1918 constrain_visibility (decl, VISIBILITY_ANON);
1919 else if (TREE_CODE (decl) != TYPE_DECL)
1921 /* Propagate anonymity from type to decl. */
1922 int tvis = type_visibility (TREE_TYPE (decl));
1923 if (tvis == VISIBILITY_ANON
1924 || ! DECL_VISIBILITY_SPECIFIED (decl))
1925 constrain_visibility (decl, tvis);
1929 /* By default, static data members and function members receive
1930 the visibility of their containing class. */
1933 determine_visibility_from_class (tree decl, tree class_type)
1935 if (DECL_VISIBILITY_SPECIFIED (decl))
1938 if (visibility_options.inlines_hidden
1939 /* Don't do this for inline templates; specializations might not be
1940 inline, and we don't want them to inherit the hidden
1941 visibility. We'll set it here for all inline instantiations. */
1942 && !processing_template_decl
1943 && TREE_CODE (decl) == FUNCTION_DECL
1944 && DECL_DECLARED_INLINE_P (decl)
1945 && (! DECL_LANG_SPECIFIC (decl)
1946 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1947 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1950 /* Default to the class visibility. */
1951 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1952 DECL_VISIBILITY_SPECIFIED (decl)
1953 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1956 /* Give the target a chance to override the visibility associated
1958 if (TREE_CODE (decl) == VAR_DECL
1959 && (DECL_TINFO_P (decl)
1960 || (DECL_VTABLE_OR_VTT_P (decl)
1961 /* Construction virtual tables are not exported because
1962 they cannot be referred to from other object files;
1963 their name is not standardized by the ABI. */
1964 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1965 && TREE_PUBLIC (decl)
1966 && !DECL_REALLY_EXTERN (decl)
1967 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1968 targetm.cxx.determine_class_data_visibility (decl);
1971 /* Constrain the visibility of a class TYPE based on the visibility of its
1972 field types. Warn if any fields require lesser visibility. */
1975 constrain_class_visibility (tree type)
1981 int vis = type_visibility (type);
1983 if (vis == VISIBILITY_ANON
1984 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1987 /* Don't warn about visibility if the class has explicit visibility. */
1988 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1989 vis = VISIBILITY_INTERNAL;
1991 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1992 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1994 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
1995 int subvis = type_visibility (ftype);
1997 if (subvis == VISIBILITY_ANON)
1999 if (!in_main_input_context ())
2001 %qT has a field %qD whose type uses the anonymous namespace",
2004 else if (IS_AGGR_TYPE (ftype)
2005 && vis < VISIBILITY_HIDDEN
2006 && subvis >= VISIBILITY_HIDDEN)
2007 warning (OPT_Wattributes, "\
2008 %qT declared with greater visibility than the type of its field %qD",
2012 binfo = TYPE_BINFO (type);
2013 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2015 int subvis = type_visibility (TREE_TYPE (t));
2017 if (subvis == VISIBILITY_ANON)
2019 if (!in_main_input_context())
2021 %qT has a base %qT whose type uses the anonymous namespace",
2022 type, TREE_TYPE (t));
2024 else if (vis < VISIBILITY_HIDDEN
2025 && subvis >= VISIBILITY_HIDDEN)
2026 warning (OPT_Wattributes, "\
2027 %qT declared with greater visibility than its base %qT",
2028 type, TREE_TYPE (t));
2032 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2033 for DECL has not already been determined, do so now by setting
2034 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2035 function is called entities with vague linkage whose definitions
2036 are available must have TREE_PUBLIC set.
2038 If this function decides to place DECL in COMDAT, it will set
2039 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2040 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2041 callers defer that decision until it is clear that DECL is actually
2045 import_export_decl (tree decl)
2050 tree class_type = NULL_TREE;
2052 if (DECL_INTERFACE_KNOWN (decl))
2055 /* We cannot determine what linkage to give to an entity with vague
2056 linkage until the end of the file. For example, a virtual table
2057 for a class will be defined if and only if the key method is
2058 defined in this translation unit. As a further example, consider
2059 that when compiling a translation unit that uses PCH file with
2060 "-frepo" it would be incorrect to make decisions about what
2061 entities to emit when building the PCH; those decisions must be
2062 delayed until the repository information has been processed. */
2063 gcc_assert (at_eof);
2064 /* Object file linkage for explicit instantiations is handled in
2065 mark_decl_instantiated. For static variables in functions with
2066 vague linkage, maybe_commonize_var is used.
2068 Therefore, the only declarations that should be provided to this
2069 function are those with external linkage that are:
2071 * implicit instantiations of function templates
2075 * implicit instantiations of static data members of class
2082 Furthermore, all entities that reach this point must have a
2083 definition available in this translation unit.
2085 The following assertions check these conditions. */
2086 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2087 || TREE_CODE (decl) == VAR_DECL);
2088 /* Any code that creates entities with TREE_PUBLIC cleared should
2089 also set DECL_INTERFACE_KNOWN. */
2090 gcc_assert (TREE_PUBLIC (decl));
2091 if (TREE_CODE (decl) == FUNCTION_DECL)
2092 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2093 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2094 || DECL_DECLARED_INLINE_P (decl));
2096 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2097 || DECL_VTABLE_OR_VTT_P (decl)
2098 || DECL_TINFO_P (decl));
2099 /* Check that a definition of DECL is available in this translation
2101 gcc_assert (!DECL_REALLY_EXTERN (decl));
2103 /* Assume that DECL will not have COMDAT linkage. */
2105 /* Assume that DECL will not be imported into this translation
2109 /* See if the repository tells us whether or not to emit DECL in
2110 this translation unit. */
2111 emit_p = repo_emit_p (decl);
2114 else if (emit_p == 1)
2116 /* The repository indicates that this entity should be defined
2117 here. Make sure the back end honors that request. */
2118 if (TREE_CODE (decl) == VAR_DECL)
2120 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2121 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2124 FOR_EACH_CLONE (clone, decl)
2125 mark_needed (clone);
2129 /* Output the definition as an ordinary strong definition. */
2130 DECL_EXTERNAL (decl) = 0;
2131 DECL_INTERFACE_KNOWN (decl) = 1;
2136 /* We have already decided what to do with this DECL; there is no
2137 need to check anything further. */
2139 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2141 class_type = DECL_CONTEXT (decl);
2142 import_export_class (class_type);
2143 if (TYPE_FOR_JAVA (class_type))
2145 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2146 && CLASSTYPE_INTERFACE_ONLY (class_type))
2148 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2149 && !CLASSTYPE_USE_TEMPLATE (class_type)
2150 && CLASSTYPE_KEY_METHOD (class_type)
2151 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2152 /* The ABI requires that all virtual tables be emitted with
2153 COMDAT linkage. However, on systems where COMDAT symbols
2154 don't show up in the table of contents for a static
2155 archive, or on systems without weak symbols (where we
2156 approximate COMDAT linkage by using internal linkage), the
2157 linker will report errors about undefined symbols because
2158 it will not see the virtual table definition. Therefore,
2159 in the case that we know that the virtual table will be
2160 emitted in only one translation unit, we make the virtual
2161 table an ordinary definition with external linkage. */
2162 DECL_EXTERNAL (decl) = 0;
2163 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2165 /* CLASS_TYPE is being exported from this translation unit,
2166 so DECL should be defined here. */
2167 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2168 /* If a class is declared in a header with the "extern
2169 template" extension, then it will not be instantiated,
2170 even in translation units that would normally require
2171 it. Often such classes are explicitly instantiated in
2172 one translation unit. Therefore, the explicit
2173 instantiation must be made visible to other translation
2175 DECL_EXTERNAL (decl) = 0;
2178 /* The generic C++ ABI says that class data is always
2179 COMDAT, even if there is a key function. Some
2180 variants (e.g., the ARM EABI) says that class data
2181 only has COMDAT linkage if the class data might be
2182 emitted in more than one translation unit. When the
2183 key method can be inline and is inline, we still have
2184 to arrange for comdat even though
2185 class_data_always_comdat is false. */
2186 if (!CLASSTYPE_KEY_METHOD (class_type)
2187 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2188 || targetm.cxx.class_data_always_comdat ())
2190 /* The ABI requires COMDAT linkage. Normally, we
2191 only emit COMDAT things when they are needed;
2192 make sure that we realize that this entity is
2199 else if (!flag_implicit_templates
2200 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2205 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2207 tree type = TREE_TYPE (DECL_NAME (decl));
2208 if (CLASS_TYPE_P (type))
2211 import_export_class (type);
2212 if (CLASSTYPE_INTERFACE_KNOWN (type)
2213 && TYPE_POLYMORPHIC_P (type)
2214 && CLASSTYPE_INTERFACE_ONLY (type)
2215 /* If -fno-rtti was specified, then we cannot be sure
2216 that RTTI information will be emitted with the
2217 virtual table of the class, so we must emit it
2218 wherever it is used. */
2223 if (CLASSTYPE_INTERFACE_KNOWN (type)
2224 && !CLASSTYPE_INTERFACE_ONLY (type))
2226 comdat_p = (targetm.cxx.class_data_always_comdat ()
2227 || (CLASSTYPE_KEY_METHOD (type)
2228 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2233 DECL_EXTERNAL (decl) = 0;
2243 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2244 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2246 /* DECL is an implicit instantiation of a function or static
2248 if ((flag_implicit_templates
2249 && !flag_use_repository)
2250 || (flag_implicit_inline_templates
2251 && TREE_CODE (decl) == FUNCTION_DECL
2252 && DECL_DECLARED_INLINE_P (decl)))
2255 /* If we are not implicitly generating templates, then mark
2256 this entity as undefined in this translation unit. */
2259 else if (DECL_FUNCTION_MEMBER_P (decl))
2261 if (!DECL_DECLARED_INLINE_P (decl))
2263 tree ctype = DECL_CONTEXT (decl);
2264 import_export_class (ctype);
2265 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2267 DECL_NOT_REALLY_EXTERN (decl)
2268 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2269 || (DECL_DECLARED_INLINE_P (decl)
2270 && ! flag_implement_inlines
2271 && !DECL_VINDEX (decl)));
2273 if (!DECL_NOT_REALLY_EXTERN (decl))
2274 DECL_EXTERNAL (decl) = 1;
2276 /* Always make artificials weak. */
2277 if (DECL_ARTIFICIAL (decl) && flag_weak)
2280 maybe_make_one_only (decl);
2291 /* If we are importing DECL into this translation unit, mark is
2292 an undefined here. */
2293 DECL_EXTERNAL (decl) = 1;
2294 DECL_NOT_REALLY_EXTERN (decl) = 0;
2298 /* If we decided to put DECL in COMDAT, mark it accordingly at
2300 comdat_linkage (decl);
2303 DECL_INTERFACE_KNOWN (decl) = 1;
2306 /* Return an expression that performs the destruction of DECL, which
2307 must be a VAR_DECL whose type has a non-trivial destructor, or is
2308 an array whose (innermost) elements have a non-trivial destructor. */
2311 build_cleanup (tree decl)
2314 tree type = TREE_TYPE (decl);
2316 /* This function should only be called for declarations that really
2317 require cleanups. */
2318 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2320 /* Treat all objects with destructors as used; the destructor may do
2321 something substantive. */
2324 if (TREE_CODE (type) == ARRAY_TYPE)
2327 temp = build_address (decl);
2328 temp = build_delete (TREE_TYPE (temp), temp,
2329 sfk_complete_destructor,
2330 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2334 /* Returns the initialization guard variable for the variable DECL,
2335 which has static storage duration. */
2338 get_guard (tree decl)
2343 sname = mangle_guard_variable (decl);
2344 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2349 /* We use a type that is big enough to contain a mutex as well
2350 as an integer counter. */
2351 guard_type = targetm.cxx.guard_type ();
2352 guard = build_decl (VAR_DECL, sname, guard_type);
2354 /* The guard should have the same linkage as what it guards. */
2355 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2356 TREE_STATIC (guard) = TREE_STATIC (decl);
2357 DECL_COMMON (guard) = DECL_COMMON (decl);
2358 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2359 if (TREE_PUBLIC (decl))
2360 DECL_WEAK (guard) = DECL_WEAK (decl);
2361 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2362 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2364 DECL_ARTIFICIAL (guard) = 1;
2365 DECL_IGNORED_P (guard) = 1;
2366 TREE_USED (guard) = 1;
2367 pushdecl_top_level_and_finish (guard, NULL_TREE);
2372 /* Return those bits of the GUARD variable that should be set when the
2373 guarded entity is actually initialized. */
2376 get_guard_bits (tree guard)
2378 if (!targetm.cxx.guard_mask_bit ())
2380 /* We only set the first byte of the guard, in order to leave room
2381 for a mutex in the high-order bits. */
2382 guard = build1 (ADDR_EXPR,
2383 build_pointer_type (TREE_TYPE (guard)),
2385 guard = build1 (NOP_EXPR,
2386 build_pointer_type (char_type_node),
2388 guard = build1 (INDIRECT_REF, char_type_node, guard);
2394 /* Return an expression which determines whether or not the GUARD
2395 variable has already been initialized. */
2398 get_guard_cond (tree guard)
2402 /* Check to see if the GUARD is zero. */
2403 guard = get_guard_bits (guard);
2405 /* Mask off all but the low bit. */
2406 if (targetm.cxx.guard_mask_bit ())
2408 guard_value = integer_one_node;
2409 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2410 guard_value = convert (TREE_TYPE (guard), guard_value);
2411 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2414 guard_value = integer_zero_node;
2415 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2416 guard_value = convert (TREE_TYPE (guard), guard_value);
2417 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2420 /* Return an expression which sets the GUARD variable, indicating that
2421 the variable being guarded has been initialized. */
2424 set_guard (tree guard)
2428 /* Set the GUARD to one. */
2429 guard = get_guard_bits (guard);
2430 guard_init = integer_one_node;
2431 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2432 guard_init = convert (TREE_TYPE (guard), guard_init);
2433 return build_modify_expr (guard, NOP_EXPR, guard_init);
2436 /* Start the process of running a particular set of global constructors
2437 or destructors. Subroutine of do_[cd]tors. */
2440 start_objects (int method_type, int initp)
2446 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2448 if (initp != DEFAULT_INIT_PRIORITY)
2458 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2461 sprintf (type, "%c", method_type);
2463 fndecl = build_lang_decl (FUNCTION_DECL,
2464 get_file_function_name (type),
2465 build_function_type (void_type_node,
2467 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2469 TREE_PUBLIC (current_function_decl) = 0;
2471 /* Mark as artificial because it's not explicitly in the user's
2473 DECL_ARTIFICIAL (current_function_decl) = 1;
2475 /* Mark this declaration as used to avoid spurious warnings. */
2476 TREE_USED (current_function_decl) = 1;
2478 /* Mark this function as a global constructor or destructor. */
2479 if (method_type == 'I')
2480 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2482 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2483 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2485 body = begin_compound_stmt (BCS_FN_BODY);
2490 /* Finish the process of running a particular set of global constructors
2491 or destructors. Subroutine of do_[cd]tors. */
2494 finish_objects (int method_type, int initp, tree body)
2499 finish_compound_stmt (body);
2500 fn = finish_function (0);
2502 if (method_type == 'I')
2504 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2505 decl_init_priority_insert (fn, initp);
2509 DECL_STATIC_DESTRUCTOR (fn) = 1;
2510 decl_fini_priority_insert (fn, initp);
2513 expand_or_defer_fn (fn);
2516 /* The names of the parameters to the function created to handle
2517 initializations and destructions for objects with static storage
2519 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2520 #define PRIORITY_IDENTIFIER "__priority"
2522 /* The name of the function we create to handle initializations and
2523 destructions for objects with static storage duration. */
2524 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2526 /* The declaration for the __INITIALIZE_P argument. */
2527 static GTY(()) tree initialize_p_decl;
2529 /* The declaration for the __PRIORITY argument. */
2530 static GTY(()) tree priority_decl;
2532 /* The declaration for the static storage duration function. */
2533 static GTY(()) tree ssdf_decl;
2535 /* All the static storage duration functions created in this
2536 translation unit. */
2537 static GTY(()) VEC(tree,gc) *ssdf_decls;
2539 /* A map from priority levels to information about that priority
2540 level. There may be many such levels, so efficient lookup is
2542 static splay_tree priority_info_map;
2544 /* Begins the generation of the function that will handle all
2545 initialization and destruction of objects with static storage
2546 duration. The function generated takes two parameters of type
2547 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2548 nonzero, it performs initializations. Otherwise, it performs
2549 destructions. It only performs those initializations or
2550 destructions with the indicated __PRIORITY. The generated function
2553 It is assumed that this function will only be called once per
2554 translation unit. */
2557 start_static_storage_duration_function (unsigned count)
2562 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2564 /* Create the identifier for this function. It will be of the form
2565 SSDF_IDENTIFIER_<number>. */
2566 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2568 /* Create the parameters. */
2569 parm_types = void_list_node;
2570 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2571 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2572 type = build_function_type (void_type_node, parm_types);
2574 /* Create the FUNCTION_DECL itself. */
2575 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2576 get_identifier (id),
2578 TREE_PUBLIC (ssdf_decl) = 0;
2579 DECL_ARTIFICIAL (ssdf_decl) = 1;
2580 DECL_INLINE (ssdf_decl) = 1;
2582 /* Put this function in the list of functions to be called from the
2583 static constructors and destructors. */
2586 ssdf_decls = VEC_alloc (tree, gc, 32);
2588 /* Take this opportunity to initialize the map from priority
2589 numbers to information about that priority level. */
2590 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2591 /*delete_key_fn=*/0,
2592 /*delete_value_fn=*/
2593 (splay_tree_delete_value_fn) &free);
2595 /* We always need to generate functions for the
2596 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2597 priorities later, we'll be sure to find the
2598 DEFAULT_INIT_PRIORITY. */
2599 get_priority_info (DEFAULT_INIT_PRIORITY);
2602 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2604 /* Create the argument list. */
2605 initialize_p_decl = cp_build_parm_decl
2606 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2607 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2608 TREE_USED (initialize_p_decl) = 1;
2609 priority_decl = cp_build_parm_decl
2610 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2611 DECL_CONTEXT (priority_decl) = ssdf_decl;
2612 TREE_USED (priority_decl) = 1;
2614 TREE_CHAIN (initialize_p_decl) = priority_decl;
2615 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2617 /* Put the function in the global scope. */
2618 pushdecl (ssdf_decl);
2620 /* Start the function itself. This is equivalent to declaring the
2623 static void __ssdf (int __initialize_p, init __priority_p);
2625 It is static because we only need to call this function from the
2626 various constructor and destructor functions for this module. */
2627 start_preparsed_function (ssdf_decl,
2628 /*attrs=*/NULL_TREE,
2631 /* Set up the scope of the outermost block in the function. */
2632 body = begin_compound_stmt (BCS_FN_BODY);
2637 /* Finish the generation of the function which performs initialization
2638 and destruction of objects with static storage duration. After
2639 this point, no more such objects can be created. */
2642 finish_static_storage_duration_function (tree body)
2644 /* Close out the function. */
2645 finish_compound_stmt (body);
2646 expand_or_defer_fn (finish_function (0));
2649 /* Return the information about the indicated PRIORITY level. If no
2650 code to handle this level has yet been generated, generate the
2651 appropriate prologue. */
2653 static priority_info
2654 get_priority_info (int priority)
2659 n = splay_tree_lookup (priority_info_map,
2660 (splay_tree_key) priority);
2663 /* Create a new priority information structure, and insert it
2665 pi = XNEW (struct priority_info_s);
2666 pi->initializations_p = 0;
2667 pi->destructions_p = 0;
2668 splay_tree_insert (priority_info_map,
2669 (splay_tree_key) priority,
2670 (splay_tree_value) pi);
2673 pi = (priority_info) n->value;
2678 /* The effective initialization priority of a DECL. */
2680 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2681 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2682 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2684 /* Whether a DECL needs a guard to protect it against multiple
2687 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2688 || DECL_ONE_ONLY (decl) \
2689 || DECL_WEAK (decl)))
2691 /* Set up to handle the initialization or destruction of DECL. If
2692 INITP is nonzero, we are initializing the variable. Otherwise, we
2693 are destroying it. */
2696 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2698 tree guard_if_stmt = NULL_TREE;
2701 /* If we are supposed to destruct and there's a trivial destructor,
2702 nothing has to be done. */
2704 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2707 /* Trick the compiler into thinking we are at the file and line
2708 where DECL was declared so that error-messages make sense, and so
2709 that the debugger will show somewhat sensible file and line
2711 input_location = DECL_SOURCE_LOCATION (decl);
2717 Access control for implicit calls to the constructors,
2718 the conversion functions, or the destructor called to
2719 create and destroy a static data member is performed as
2720 if these calls appeared in the scope of the member's
2723 we pretend we are in a static member function of the class of
2724 which the DECL is a member. */
2725 if (member_p (decl))
2727 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2728 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2731 /* Assume we don't need a guard. */
2733 /* We need a guard if this is an object with external linkage that
2734 might be initialized in more than one place. (For example, a
2735 static data member of a template, when the data member requires
2737 if (NEEDS_GUARD_P (decl))
2741 guard = get_guard (decl);
2743 /* When using __cxa_atexit, we just check the GUARD as we would
2744 for a local static. */
2745 if (flag_use_cxa_atexit)
2747 /* When using __cxa_atexit, we never try to destroy
2748 anything from a static destructor. */
2750 guard_cond = get_guard_cond (guard);
2752 /* If we don't have __cxa_atexit, then we will be running
2753 destructors from .fini sections, or their equivalents. So,
2754 we need to know how many times we've tried to initialize this
2755 object. We do initializations only if the GUARD is zero,
2756 i.e., if we are the first to initialize the variable. We do
2757 destructions only if the GUARD is one, i.e., if we are the
2758 last to destroy the variable. */
2761 = cp_build_binary_op (EQ_EXPR,
2762 build_unary_op (PREINCREMENT_EXPR,
2768 = cp_build_binary_op (EQ_EXPR,
2769 build_unary_op (PREDECREMENT_EXPR,
2774 guard_if_stmt = begin_if_stmt ();
2775 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2779 /* If we're using __cxa_atexit, we have not already set the GUARD,
2780 so we must do so now. */
2781 if (guard && initp && flag_use_cxa_atexit)
2782 finish_expr_stmt (set_guard (guard));
2784 /* Perform the initialization or destruction. */
2788 finish_expr_stmt (init);
2790 /* If we're using __cxa_atexit, register a function that calls the
2791 destructor for the object. */
2792 if (flag_use_cxa_atexit)
2793 finish_expr_stmt (register_dtor_fn (decl));
2796 finish_expr_stmt (build_cleanup (decl));
2798 /* Finish the guard if-stmt, if necessary. */
2801 finish_then_clause (guard_if_stmt);
2802 finish_if_stmt (guard_if_stmt);
2805 /* Now that we're done with DECL we don't need to pretend to be a
2806 member of its class any longer. */
2807 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2808 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2811 /* Generate code to do the initialization or destruction of the decls in VARS,
2812 a TREE_LIST of VAR_DECL with static storage duration.
2813 Whether initialization or destruction is performed is specified by INITP. */
2816 do_static_initialization_or_destruction (tree vars, bool initp)
2818 tree node, init_if_stmt, cond;
2820 /* Build the outer if-stmt to check for initialization or destruction. */
2821 init_if_stmt = begin_if_stmt ();
2822 cond = initp ? integer_one_node : integer_zero_node;
2823 cond = cp_build_binary_op (EQ_EXPR,
2826 finish_if_stmt_cond (cond, init_if_stmt);
2830 tree decl = TREE_VALUE (node);
2831 tree priority_if_stmt;
2835 /* If we don't need a destructor, there's nothing to do. Avoid
2836 creating a possibly empty if-stmt. */
2837 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2839 node = TREE_CHAIN (node);
2843 /* Remember that we had an initialization or finalization at this
2845 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2846 pi = get_priority_info (priority);
2848 pi->initializations_p = 1;
2850 pi->destructions_p = 1;
2852 /* Conditionalize this initialization on being in the right priority
2853 and being initializing/finalizing appropriately. */
2854 priority_if_stmt = begin_if_stmt ();
2855 cond = cp_build_binary_op (EQ_EXPR,
2857 build_int_cst (NULL_TREE, priority));
2858 finish_if_stmt_cond (cond, priority_if_stmt);
2860 /* Process initializers with same priority. */
2862 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2863 node = TREE_CHAIN (node))
2864 /* Do one initialization or destruction. */
2865 one_static_initialization_or_destruction (TREE_VALUE (node),
2866 TREE_PURPOSE (node), initp);
2868 /* Finish up the priority if-stmt body. */
2869 finish_then_clause (priority_if_stmt);
2870 finish_if_stmt (priority_if_stmt);
2874 /* Finish up the init/destruct if-stmt body. */
2875 finish_then_clause (init_if_stmt);
2876 finish_if_stmt (init_if_stmt);
2879 /* VARS is a list of variables with static storage duration which may
2880 need initialization and/or finalization. Remove those variables
2881 that don't really need to be initialized or finalized, and return
2882 the resulting list. The order in which the variables appear in
2883 VARS is in reverse order of the order in which they should actually
2884 be initialized. The list we return is in the unreversed order;
2885 i.e., the first variable should be initialized first. */
2888 prune_vars_needing_no_initialization (tree *vars)
2891 tree result = NULL_TREE;
2896 tree decl = TREE_VALUE (t);
2897 tree init = TREE_PURPOSE (t);
2899 /* Deal gracefully with error. */
2900 if (decl == error_mark_node)
2902 var = &TREE_CHAIN (t);
2906 /* The only things that can be initialized are variables. */
2907 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2909 /* If this object is not defined, we don't need to do anything
2911 if (DECL_EXTERNAL (decl))
2913 var = &TREE_CHAIN (t);
2917 /* Also, if the initializer already contains errors, we can bail
2919 if (init && TREE_CODE (init) == TREE_LIST
2920 && value_member (error_mark_node, init))
2922 var = &TREE_CHAIN (t);
2926 /* This variable is going to need initialization and/or
2927 finalization, so we add it to the list. */
2928 *var = TREE_CHAIN (t);
2929 TREE_CHAIN (t) = result;
2936 /* Make sure we have told the back end about all the variables in
2940 write_out_vars (tree vars)
2944 for (v = vars; v; v = TREE_CHAIN (v))
2946 tree var = TREE_VALUE (v);
2947 if (!var_finalized_p (var))
2949 import_export_decl (var);
2950 rest_of_decl_compilation (var, 1, 1);
2955 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2956 (otherwise) that will initialize all global objects with static
2957 storage duration having the indicated PRIORITY. */
2960 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2969 input_location = *locus;
2970 #ifdef USE_MAPPED_LOCATION
2976 /* We use `I' to indicate initialization and `D' to indicate
2978 function_key = constructor_p ? 'I' : 'D';
2980 /* We emit the function lazily, to avoid generating empty
2981 global constructors and destructors. */
2984 /* For Objective-C++, we may need to initialize metadata found in this module.
2985 This must be done _before_ any other static initializations. */
2986 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2987 && constructor_p && objc_static_init_needed_p ())
2989 body = start_objects (function_key, priority);
2990 objc_generate_static_init_call (NULL_TREE);
2993 /* Call the static storage duration function with appropriate
2995 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2997 /* Calls to pure or const functions will expand to nothing. */
2998 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3001 body = start_objects (function_key, priority);
3003 arguments = tree_cons (NULL_TREE,
3004 build_int_cst (NULL_TREE, priority),
3006 arguments = tree_cons (NULL_TREE,
3007 build_int_cst (NULL_TREE, constructor_p),
3009 finish_expr_stmt (build_function_call (fndecl, arguments));
3013 /* Close out the function. */
3015 finish_objects (function_key, priority, body);
3018 /* Generate constructor and destructor functions for the priority
3022 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3024 location_t *locus = (location_t *) data;
3025 int priority = (int) n->key;
3026 priority_info pi = (priority_info) n->value;
3028 /* Generate the functions themselves, but only if they are really
3030 if (pi->initializations_p)
3031 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3032 if (pi->destructions_p)
3033 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3035 /* Keep iterating. */
3039 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3040 decls referenced from front-end specific constructs; it will be called
3041 only for language-specific tree nodes.
3043 Here we must deal with member pointers. */
3046 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3050 switch (TREE_CODE (t))
3053 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3054 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3057 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3058 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3061 if (DECL_VTABLE_OR_VTT_P (t))
3063 /* The ABI requires that all virtual tables be emitted
3064 whenever one of them is. */
3066 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3068 vtbl = TREE_CHAIN (vtbl))
3069 mark_decl_referenced (vtbl);
3071 else if (DECL_CONTEXT (t)
3072 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3073 /* If we need a static variable in a function, then we
3074 need the containing function. */
3075 mark_decl_referenced (DECL_CONTEXT (t));
3084 /* Java requires that we be able to reference a local address for a
3085 method, and not be confused by PLT entries. If hidden aliases are
3086 supported, emit one for each java function that we've emitted. */
3089 build_java_method_aliases (void)
3091 struct cgraph_node *node;
3093 #ifndef HAVE_GAS_HIDDEN
3097 for (node = cgraph_nodes; node ; node = node->next)
3099 tree fndecl = node->decl;
3101 if (TREE_ASM_WRITTEN (fndecl)
3102 && DECL_CONTEXT (fndecl)
3103 && TYPE_P (DECL_CONTEXT (fndecl))
3104 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3105 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3107 /* Mangle the name in a predictable way; we need to reference
3108 this from a java compiled object file. */
3109 tree oid, nid, alias;
3113 oid = DECL_ASSEMBLER_NAME (fndecl);
3114 oname = IDENTIFIER_POINTER (oid);
3115 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3116 nname = ACONCAT (("_ZGA", oname+2, NULL));
3117 nid = get_identifier (nname);
3119 alias = make_alias_for (fndecl, nid);
3120 TREE_PUBLIC (alias) = 1;
3121 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3123 assemble_alias (alias, oid);
3128 /* This routine is called at the end of compilation.
3129 Its job is to create all the code needed to initialize and
3130 destroy the global aggregates. We do the destruction
3131 first, since that way we only need to reverse the decls once. */
3134 cp_write_global_declarations (void)
3140 unsigned ssdf_count = 0;
3144 locus = input_location;
3147 /* Bad parse errors. Just forget about it. */
3148 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3152 c_common_write_pch ();
3154 #ifdef USE_MAPPED_LOCATION
3157 /* Otherwise, GDB can get confused, because in only knows
3158 about source for LINENO-1 lines. */
3162 /* We now have to write out all the stuff we put off writing out.
3165 o Template specializations that we have not yet instantiated,
3166 but which are needed.
3167 o Initialization and destruction for non-local objects with
3168 static storage duration. (Local objects with static storage
3169 duration are initialized when their scope is first entered,
3170 and are cleaned up via atexit.)
3171 o Virtual function tables.
3173 All of these may cause others to be needed. For example,
3174 instantiating one function may cause another to be needed, and
3175 generating the initializer for an object may cause templates to be
3176 instantiated, etc., etc. */
3178 timevar_push (TV_VARCONST);
3180 emit_support_tinfos ();
3189 /* If there are templates that we've put off instantiating, do
3191 instantiate_pending_templates (retries);
3194 /* Write out virtual tables as required. Note that writing out
3195 the virtual table for a template class may cause the
3196 instantiation of members of that class. If we write out
3197 vtables then we remove the class from our list so we don't
3198 have to look at it again. */
3200 while (keyed_classes != NULL_TREE
3201 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3204 keyed_classes = TREE_CHAIN (keyed_classes);
3210 tree next = TREE_CHAIN (t);
3214 if (maybe_emit_vtables (TREE_VALUE (next)))
3217 TREE_CHAIN (t) = TREE_CHAIN (next);
3222 next = TREE_CHAIN (t);
3226 /* Write out needed type info variables. We have to be careful
3227 looping through unemitted decls, because emit_tinfo_decl may
3228 cause other variables to be needed. New elements will be
3229 appended, and we remove from the vector those that actually
3231 for (i = VEC_length (tree, unemitted_tinfo_decls);
3232 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3233 if (emit_tinfo_decl (t))
3236 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3239 /* The list of objects with static storage duration is built up
3240 in reverse order. We clear STATIC_AGGREGATES so that any new
3241 aggregates added during the initialization of these will be
3242 initialized in the correct order when we next come around the
3244 vars = prune_vars_needing_no_initialization (&static_aggregates);
3248 /* We need to start a new initialization function each time
3249 through the loop. That's because we need to know which
3250 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3251 isn't computed until a function is finished, and written
3252 out. That's a deficiency in the back end. When this is
3253 fixed, these initialization functions could all become
3254 inline, with resulting performance improvements. */
3257 /* Set the line and file, so that it is obviously not from
3259 input_location = locus;
3260 ssdf_body = start_static_storage_duration_function (ssdf_count);
3262 /* Make sure the back end knows about all the variables. */
3263 write_out_vars (vars);
3265 /* First generate code to do all the initializations. */
3267 do_static_initialization_or_destruction (vars, /*initp=*/true);
3269 /* Then, generate code to do all the destructions. Do these
3270 in reverse order so that the most recently constructed
3271 variable is the first destroyed. If we're using
3272 __cxa_atexit, then we don't need to do this; functions
3273 were registered at initialization time to destroy the
3275 if (!flag_use_cxa_atexit && vars)
3277 vars = nreverse (vars);
3278 do_static_initialization_or_destruction (vars, /*initp=*/false);
3283 /* Finish up the static storage duration function for this
3285 input_location = locus;
3286 finish_static_storage_duration_function (ssdf_body);
3288 /* All those initializations and finalizations might cause
3289 us to need more inline functions, more template
3290 instantiations, etc. */
3293 #ifdef USE_MAPPED_LOCATION
3300 /* Go through the set of inline functions whose bodies have not
3301 been emitted yet. If out-of-line copies of these functions
3302 are required, emit them. */
3303 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3305 /* Does it need synthesizing? */
3306 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3307 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3309 /* Even though we're already at the top-level, we push
3310 there again. That way, when we pop back a few lines
3311 hence, all of our state is restored. Otherwise,
3312 finish_function doesn't clean things up, and we end
3313 up with CURRENT_FUNCTION_DECL set. */
3314 push_to_top_level ();
3315 /* The decl's location will mark where it was first
3316 needed. Save that so synthesize method can indicate
3317 where it was needed from, in case of error */
3318 input_location = DECL_SOURCE_LOCATION (decl);
3319 synthesize_method (decl);
3320 pop_from_top_level ();
3324 if (!DECL_SAVED_TREE (decl))
3327 /* We lie to the back end, pretending that some functions
3328 are not defined when they really are. This keeps these
3329 functions from being put out unnecessarily. But, we must
3330 stop lying when the functions are referenced, or if they
3331 are not comdat since they need to be put out now. If
3332 DECL_INTERFACE_KNOWN, then we have already set
3333 DECL_EXTERNAL appropriately, so there's no need to check
3334 again, and we do not want to clear DECL_EXTERNAL if a
3335 previous call to import_export_decl set it.
3337 This is done in a separate for cycle, because if some
3338 deferred function is contained in another deferred
3339 function later in deferred_fns varray,
3340 rest_of_compilation would skip this function and we
3341 really cannot expand the same function twice. */
3342 import_export_decl (decl);
3343 if (DECL_NOT_REALLY_EXTERN (decl)
3344 && DECL_INITIAL (decl)
3345 && decl_needed_p (decl))
3346 DECL_EXTERNAL (decl) = 0;
3348 /* If we're going to need to write this function out, and
3349 there's already a body for it, create RTL for it now.
3350 (There might be no body if this is a method we haven't
3351 gotten around to synthesizing yet.) */
3352 if (!DECL_EXTERNAL (decl)
3353 && decl_needed_p (decl)
3354 && !TREE_ASM_WRITTEN (decl)
3355 && !cgraph_node (decl)->local.finalized)
3357 /* We will output the function; no longer consider it in this
3359 DECL_DEFER_OUTPUT (decl) = 0;
3360 /* Generate RTL for this function now that we know we
3362 expand_or_defer_fn (decl);
3363 /* If we're compiling -fsyntax-only pretend that this
3364 function has been written out so that we don't try to
3366 if (flag_syntax_only)
3367 TREE_ASM_WRITTEN (decl) = 1;
3372 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3375 /* Static data members are just like namespace-scope globals. */
3376 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3378 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3380 import_export_decl (decl);
3381 /* If this static data member is needed, provide it to the
3383 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3384 DECL_EXTERNAL (decl) = 0;
3386 if (VEC_length (tree, pending_statics) != 0
3387 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3388 VEC_length (tree, pending_statics)))
3395 /* All used inline functions must have a definition at this point. */
3396 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3398 if (/* Check online inline functions that were actually used. */
3399 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3400 /* If the definition actually was available here, then the
3401 fact that the function was not defined merely represents
3402 that for some reason (use of a template repository,
3403 #pragma interface, etc.) we decided not to emit the
3405 && !DECL_INITIAL (decl)
3406 /* An explicit instantiation can be used to specify
3407 that the body is in another unit. It will have
3408 already verified there was a definition. */
3409 && !DECL_EXPLICIT_INSTANTIATION (decl))
3411 warning (0, "inline function %q+D used but never defined", decl);
3412 /* Avoid a duplicate warning from check_global_declaration_1. */
3413 TREE_NO_WARNING (decl) = 1;
3417 /* We give C linkage to static constructors and destructors. */
3418 push_lang_context (lang_name_c);
3420 /* Generate initialization and destruction functions for all
3421 priorities for which they are required. */
3422 if (priority_info_map)
3423 splay_tree_foreach (priority_info_map,
3424 generate_ctor_and_dtor_functions_for_priority,
3426 else if (c_dialect_objc () && objc_static_init_needed_p ())
3427 /* If this is obj-c++ and we need a static init, call
3428 generate_ctor_or_dtor_function. */
3429 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3430 DEFAULT_INIT_PRIORITY, &locus);
3432 /* We're done with the splay-tree now. */
3433 if (priority_info_map)
3434 splay_tree_delete (priority_info_map);
3436 /* Generate any missing aliases. */
3437 maybe_apply_pending_pragma_weaks ();
3439 /* We're done with static constructors, so we can go back to "C++"
3441 pop_lang_context ();
3443 cgraph_finalize_compilation_unit ();
3446 /* Now, issue warnings about static, but not defined, functions,
3447 etc., and emit debugging information. */
3448 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3449 if (VEC_length (tree, pending_statics) != 0)
3451 check_global_declarations (VEC_address (tree, pending_statics),
3452 VEC_length (tree, pending_statics));
3453 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3454 VEC_length (tree, pending_statics));
3457 /* Generate hidden aliases for Java. */
3458 build_java_method_aliases ();
3462 /* The entire file is now complete. If requested, dump everything
3466 FILE *stream = dump_begin (TDI_tu, &flags);
3470 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3471 dump_end (TDI_tu, stream);
3475 timevar_pop (TV_VARCONST);
3477 if (flag_detailed_statistics)
3479 dump_tree_statistics ();
3480 dump_time_statistics ();
3482 input_location = locus;
3484 #ifdef ENABLE_CHECKING
3485 validate_conversion_obstack ();
3486 #endif /* ENABLE_CHECKING */
3489 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3490 function to call in parse-tree form; it has not yet been
3491 semantically analyzed. ARGS are the arguments to the function.
3492 They have already been semantically analyzed. */
3495 build_offset_ref_call_from_tree (tree fn, tree args)
3504 object = TREE_OPERAND (fn, 0);
3506 if (processing_template_decl)
3508 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3509 || TREE_CODE (fn) == MEMBER_REF);
3510 if (type_dependent_expression_p (fn)
3511 || any_type_dependent_arguments_p (args))
3512 return build_nt_call_list (fn, args);
3514 /* Transform the arguments and add the implicit "this"
3515 parameter. That must be done before the FN is transformed
3516 because we depend on the form of FN. */
3517 args = build_non_dependent_args (args);
3518 object = build_non_dependent_expr (object);
3519 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3520 object = build_unary_op (ADDR_EXPR, object, 0);
3521 args = tree_cons (NULL_TREE, object, args);
3522 /* Now that the arguments are done, transform FN. */
3523 fn = build_non_dependent_expr (fn);
3526 /* A qualified name corresponding to a bound pointer-to-member is
3527 represented as an OFFSET_REF:
3529 struct B { void g(); };
3531 void B::g() { (this->*p)(); } */
3532 if (TREE_CODE (fn) == OFFSET_REF)
3534 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3535 fn = TREE_OPERAND (fn, 1);
3536 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3537 args = tree_cons (NULL_TREE, object_addr, args);
3540 expr = build_function_call (fn, args);
3541 if (processing_template_decl && expr != error_mark_node)
3542 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3548 check_default_args (tree x)
3550 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3551 bool saw_def = false;
3552 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3553 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3555 if (TREE_PURPOSE (arg))
3559 error ("default argument missing for parameter %P of %q+#D", i, x);
3560 TREE_PURPOSE (arg) = error_mark_node;
3565 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3566 If DECL is a specialization or implicitly declared class member,
3567 generate the actual definition. */
3570 mark_used (tree decl)
3572 HOST_WIDE_INT saved_processing_template_decl = 0;
3574 /* If DECL is a BASELINK for a single function, then treat it just
3575 like the DECL for the function. Otherwise, if the BASELINK is
3576 for an overloaded function, we don't know which function was
3577 actually used until after overload resolution. */
3578 if (TREE_CODE (decl) == BASELINK)
3580 decl = BASELINK_FUNCTIONS (decl);
3581 if (really_overloaded_fn (decl))
3583 decl = OVL_CURRENT (decl);
3586 TREE_USED (decl) = 1;
3587 if (DECL_CLONED_FUNCTION_P (decl))
3588 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3589 /* If we don't need a value, then we don't need to synthesize DECL. */
3590 if (skip_evaluation)
3592 /* Normally, we can wait until instantiation-time to synthesize
3593 DECL. However, if DECL is a static data member initialized with
3594 a constant, we need the value right now because a reference to
3595 such a data member is not value-dependent. */
3596 if (TREE_CODE (decl) == VAR_DECL
3597 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3598 && DECL_CLASS_SCOPE_P (decl))
3600 /* Don't try to instantiate members of dependent types. We
3601 cannot just use dependent_type_p here because this function
3602 may be called from fold_non_dependent_expr, and then we may
3603 see dependent types, even though processing_template_decl
3605 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3606 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3608 /* Pretend that we are not in a template, even if we are, so
3609 that the static data member initializer will be processed. */
3610 saved_processing_template_decl = processing_template_decl;
3611 processing_template_decl = 0;
3614 if (processing_template_decl)
3617 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3618 && !TREE_ASM_WRITTEN (decl))
3619 /* Remember it, so we can check it was defined. */
3621 if (DECL_DEFERRED_FN (decl))
3624 /* Remember the current location for a function we will end up
3625 synthesizing. Then we can inform the user where it was
3626 required in the case of error. */
3627 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3628 && !DECL_THUNK_P (decl))
3629 DECL_SOURCE_LOCATION (decl) = input_location;
3631 note_vague_linkage_fn (decl);
3634 assemble_external (decl);
3636 /* Is it a synthesized method that needs to be synthesized? */
3637 if (TREE_CODE (decl) == FUNCTION_DECL
3638 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3639 && DECL_ARTIFICIAL (decl)
3640 && !DECL_THUNK_P (decl)
3641 && ! DECL_INITIAL (decl)
3642 /* Kludge: don't synthesize for default args. Unfortunately this
3643 rules out initializers of namespace-scoped objects too, but
3644 it's sort-of ok if the implicit ctor or dtor decl keeps
3645 pointing to the class location. */
3646 && current_function_decl)
3648 synthesize_method (decl);
3649 /* If we've already synthesized the method we don't need to
3650 do the instantiation test below. */
3652 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3653 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3654 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3655 || (TREE_CODE (decl) == FUNCTION_DECL
3656 && DECL_INLINE (DECL_TEMPLATE_RESULT
3657 (template_for_substitution (decl))))
3658 /* We need to instantiate static data members so that there
3659 initializers are available in integral constant
3661 || (TREE_CODE (decl) == VAR_DECL
3662 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3663 /* If this is a function or variable that is an instance of some
3664 template, we now know that we will need to actually do the
3665 instantiation. We check that DECL is not an explicit
3666 instantiation because that is not checked in instantiate_decl.
3668 We put off instantiating functions in order to improve compile
3669 times. Maintaining a stack of active functions is expensive,
3670 and the inliner knows to instantiate any functions it might
3671 need. Therefore, we always try to defer instantiation. */
3672 instantiate_decl (decl, /*defer_ok=*/true,
3673 /*expl_inst_class_mem_p=*/false);
3675 processing_template_decl = saved_processing_template_decl;
3678 #include "gt-cp-decl2.h"