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 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 2, 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 COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
53 extern cpp_reader *parse_in;
55 /* This structure contains information about the initializations
56 and/or destructions required for a particular priority level. */
57 typedef struct priority_info_s {
58 /* Nonzero if there have been any initializations at this priority
59 throughout the translation unit. */
60 int initializations_p;
61 /* Nonzero if there have been any destructions at this priority
62 throughout the translation unit. */
66 static void mark_vtable_entries (tree);
67 static bool maybe_emit_vtables (tree);
68 static bool acceptable_java_type (tree);
69 static tree start_objects (int, int);
70 static void finish_objects (int, int, tree);
71 static tree start_static_storage_duration_function (unsigned);
72 static void finish_static_storage_duration_function (tree);
73 static priority_info get_priority_info (int);
74 static void do_static_initialization (tree, tree);
75 static void do_static_destruction (tree);
76 static tree start_static_initialization_or_destruction (tree, int);
77 static void finish_static_initialization_or_destruction (tree);
78 static void generate_ctor_or_dtor_function (bool, int, location_t *);
79 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
81 static tree prune_vars_needing_no_initialization (tree *);
82 static void write_out_vars (tree);
83 static void import_export_class (tree);
84 static tree get_guard_bits (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. */
99 /* Functions called along with real static constructors and destructors. */
105 /* Incorporate `const' and `volatile' qualifiers for member functions.
106 FUNCTION is a TYPE_DECL or a FUNCTION_DECL.
107 QUALS is a list of qualifiers. Returns any explicit
108 top-level qualifiers of the method's this pointer, anything other than
109 TYPE_UNQUALIFIED will be an extension. */
112 grok_method_quals (tree ctype, tree function, cp_cv_quals quals)
114 tree fntype = TREE_TYPE (function);
115 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
116 int type_quals = TYPE_UNQUALIFIED;
117 int this_quals = TYPE_UNQUALIFIED;
119 type_quals = quals & ~TYPE_QUAL_RESTRICT;
120 this_quals = quals & TYPE_QUAL_RESTRICT;
122 ctype = cp_build_qualified_type (ctype, type_quals);
123 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
124 (TREE_CODE (fntype) == METHOD_TYPE
125 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
126 : TYPE_ARG_TYPES (fntype)));
128 fntype = build_exception_variant (fntype, raises);
130 TREE_TYPE (function) = fntype;
134 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
138 cp_build_parm_decl (tree name, tree type)
140 tree parm = build_decl (PARM_DECL, name, type);
141 /* DECL_ARG_TYPE is only used by the back end and the back end never
143 if (!processing_template_decl)
144 DECL_ARG_TYPE (parm) = type_passed_as (type);
148 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
152 build_artificial_parm (tree name, tree type)
154 tree parm = cp_build_parm_decl (name, type);
155 DECL_ARTIFICIAL (parm) = 1;
156 /* All our artificial parms are implicitly `const'; they cannot be
158 TREE_READONLY (parm) = 1;
162 /* Constructors for types with virtual baseclasses need an "in-charge" flag
163 saying whether this constructor is responsible for initialization of
164 virtual baseclasses or not. All destructors also need this "in-charge"
165 flag, which additionally determines whether or not the destructor should
166 free the memory for the object.
168 This function adds the "in-charge" flag to member function FN if
169 appropriate. It is called from grokclassfn and tsubst.
170 FN must be either a constructor or destructor.
172 The in-charge flag follows the 'this' parameter, and is followed by the
173 VTT parm (if any), then the user-written parms. */
176 maybe_retrofit_in_chrg (tree fn)
178 tree basetype, arg_types, parms, parm, fntype;
180 /* If we've already add the in-charge parameter don't do it again. */
181 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
184 /* When processing templates we can't know, in general, whether or
185 not we're going to have virtual baseclasses. */
186 if (processing_template_decl)
189 /* We don't need an in-charge parameter for constructors that don't
190 have virtual bases. */
191 if (DECL_CONSTRUCTOR_P (fn)
192 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
195 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
196 basetype = TREE_TYPE (TREE_VALUE (arg_types));
197 arg_types = TREE_CHAIN (arg_types);
199 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
201 /* If this is a subobject constructor or destructor, our caller will
202 pass us a pointer to our VTT. */
203 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
205 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
207 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
208 TREE_CHAIN (parm) = parms;
211 /* ...and then to TYPE_ARG_TYPES. */
212 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
214 DECL_HAS_VTT_PARM_P (fn) = 1;
217 /* Then add the in-charge parm (before the VTT parm). */
218 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
219 TREE_CHAIN (parm) = parms;
221 arg_types = hash_tree_chain (integer_type_node, arg_types);
223 /* Insert our new parameter(s) into the list. */
224 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
226 /* And rebuild the function type. */
227 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
229 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
230 fntype = build_exception_variant (fntype,
231 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
232 TREE_TYPE (fn) = fntype;
234 /* Now we've got the in-charge parameter. */
235 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
238 /* Classes overload their constituent function names automatically.
239 When a function name is declared in a record structure,
240 its name is changed to it overloaded name. Since names for
241 constructors and destructors can conflict, we place a leading
244 CNAME is the name of the class we are grokking for.
246 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
248 FLAGS contains bits saying what's special about today's
249 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
251 If FUNCTION is a destructor, then we must add the `auto-delete' field
252 as a second parameter. There is some hair associated with the fact
253 that we must "declare" this variable in the manner consistent with the
254 way the rest of the arguments were declared.
256 QUALS are the qualifiers for the this pointer. */
259 grokclassfn (tree ctype, tree function, enum overload_flags flags,
262 tree fn_name = DECL_NAME (function);
263 cp_cv_quals this_quals = TYPE_UNQUALIFIED;
265 /* Even within an `extern "C"' block, members get C++ linkage. See
266 [dcl.link] for details. */
267 SET_DECL_LANGUAGE (function, lang_cplusplus);
269 if (fn_name == NULL_TREE)
271 error ("name missing for member function");
272 fn_name = get_identifier ("<anonymous>");
273 DECL_NAME (function) = fn_name;
277 this_quals = grok_method_quals (ctype, function, quals);
279 if (TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
281 /* Must add the class instance variable up front. */
282 /* Right now we just make this a pointer. But later
283 we may wish to make it special. */
284 tree type = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (function)));
288 /* The `this' parameter is implicitly `const'; it cannot be
290 this_quals |= TYPE_QUAL_CONST;
291 qual_type = cp_build_qualified_type (type, this_quals);
292 parm = build_artificial_parm (this_identifier, qual_type);
293 cp_apply_type_quals_to_decl (this_quals, parm);
294 TREE_CHAIN (parm) = DECL_ARGUMENTS (function);
295 DECL_ARGUMENTS (function) = parm;
298 DECL_CONTEXT (function) = ctype;
300 if (flags == DTOR_FLAG)
301 DECL_DESTRUCTOR_P (function) = 1;
303 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
304 maybe_retrofit_in_chrg (function);
307 /* Create an ARRAY_REF, checking for the user doing things backwards
311 grok_array_decl (tree array_expr, tree index_exp)
315 tree orig_array_expr = array_expr;
316 tree orig_index_exp = index_exp;
318 if (error_operand_p (array_expr) || error_operand_p (index_exp))
319 return error_mark_node;
321 if (processing_template_decl)
323 if (type_dependent_expression_p (array_expr)
324 || type_dependent_expression_p (index_exp))
325 return build_min_nt (ARRAY_REF, array_expr, index_exp,
326 NULL_TREE, NULL_TREE);
327 array_expr = build_non_dependent_expr (array_expr);
328 index_exp = build_non_dependent_expr (index_exp);
331 type = TREE_TYPE (array_expr);
333 type = non_reference (type);
335 /* If they have an `operator[]', use that. */
336 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
337 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
338 array_expr, index_exp, NULL_TREE,
339 /*overloaded_p=*/NULL);
344 /* Otherwise, create an ARRAY_REF for a pointer or array type.
345 It is a little-known fact that, if `a' is an array and `i' is
346 an int, you can write `i[a]', which means the same thing as
348 if (TREE_CODE (type) == ARRAY_TYPE)
351 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
353 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
356 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
358 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
360 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
363 if ((p1 && i2) && (i1 && p2))
364 error ("ambiguous conversion for array subscript");
367 array_expr = p1, index_exp = i2;
369 array_expr = p2, index_exp = i1;
372 error ("invalid types %<%T[%T]%> for array subscript",
373 type, TREE_TYPE (index_exp));
374 return error_mark_node;
377 if (array_expr == error_mark_node || index_exp == error_mark_node)
378 error ("ambiguous conversion for array subscript");
380 expr = build_array_ref (array_expr, index_exp);
382 if (processing_template_decl && expr != error_mark_node)
383 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
384 NULL_TREE, NULL_TREE);
388 /* Given the cast expression EXP, checking out its validity. Either return
389 an error_mark_node if there was an unavoidable error, return a cast to
390 void for trying to delete a pointer w/ the value 0, or return the
391 call to delete. If DOING_VEC is true, we handle things differently
392 for doing an array delete.
393 Implements ARM $5.3.4. This is called from the parser. */
396 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
400 if (exp == error_mark_node)
403 if (processing_template_decl)
405 t = build_min (DELETE_EXPR, void_type_node, exp, size);
406 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
407 DELETE_EXPR_USE_VEC (t) = doing_vec;
408 TREE_SIDE_EFFECTS (t) = 1;
412 /* An array can't have been allocated by new, so complain. */
413 if (TREE_CODE (exp) == VAR_DECL
414 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
415 warning (0, "deleting array %q#D", exp);
417 t = build_expr_type_conversion (WANT_POINTER, exp, true);
419 if (t == NULL_TREE || t == error_mark_node)
421 error ("type %q#T argument given to %<delete%>, expected pointer",
423 return error_mark_node;
426 type = TREE_TYPE (t);
428 /* As of Valley Forge, you can delete a pointer to const. */
430 /* You can't delete functions. */
431 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
433 error ("cannot delete a function. Only pointer-to-objects are "
434 "valid arguments to %<delete%>");
435 return error_mark_node;
438 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
439 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
441 warning (0, "deleting %qT is undefined", type);
445 /* Deleting a pointer with the value zero is valid and has no effect. */
446 if (integer_zerop (t))
447 return build1 (NOP_EXPR, void_type_node, t);
450 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
451 sfk_deleting_destructor,
454 return build_delete (type, t, sfk_deleting_destructor,
455 LOOKUP_NORMAL, use_global_delete);
458 /* Report an error if the indicated template declaration is not the
459 sort of thing that should be a member template. */
462 check_member_template (tree tmpl)
466 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
467 decl = DECL_TEMPLATE_RESULT (tmpl);
469 if (TREE_CODE (decl) == FUNCTION_DECL
470 || (TREE_CODE (decl) == TYPE_DECL
471 && IS_AGGR_TYPE (TREE_TYPE (decl))))
473 if (current_function_decl)
474 /* 14.5.2.2 [temp.mem]
476 A local class shall not have member templates. */
477 error ("invalid declaration of member template %q#D in local class",
480 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VIRTUAL_P (decl))
482 /* 14.5.2.3 [temp.mem]
484 A member function template shall not be virtual. */
486 ("invalid use of %<virtual%> in template declaration of %q#D",
488 DECL_VIRTUAL_P (decl) = 0;
491 /* The debug-information generating code doesn't know what to do
492 with member templates. */
493 DECL_IGNORED_P (tmpl) = 1;
496 error ("template declaration of %q#D", decl);
499 /* Return true iff TYPE is a valid Java parameter or return type. */
502 acceptable_java_type (tree type)
504 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
506 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
508 type = TREE_TYPE (type);
509 if (TREE_CODE (type) == RECORD_TYPE)
512 if (! TYPE_FOR_JAVA (type))
514 if (! CLASSTYPE_TEMPLATE_INFO (type))
516 args = CLASSTYPE_TI_ARGS (type);
517 i = TREE_VEC_LENGTH (args);
520 type = TREE_VEC_ELT (args, i);
521 if (TREE_CODE (type) == POINTER_TYPE)
522 type = TREE_TYPE (type);
523 if (! TYPE_FOR_JAVA (type))
532 /* For a METHOD in a Java class CTYPE, return true if
533 the parameter and return types are valid Java types.
534 Otherwise, print appropriate error messages, and return false. */
537 check_java_method (tree method)
540 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
541 tree ret_type = TREE_TYPE (TREE_TYPE (method));
543 if (!acceptable_java_type (ret_type))
545 error ("Java method %qD has non-Java return type %qT",
550 arg_types = TREE_CHAIN (arg_types);
551 if (DECL_HAS_IN_CHARGE_PARM_P (method))
552 arg_types = TREE_CHAIN (arg_types);
553 if (DECL_HAS_VTT_PARM_P (method))
554 arg_types = TREE_CHAIN (arg_types);
556 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
558 tree type = TREE_VALUE (arg_types);
559 if (!acceptable_java_type (type))
561 error ("Java method %qD has non-Java parameter type %qT",
569 /* Sanity check: report error if this function FUNCTION is not
570 really a member of the class (CTYPE) it is supposed to belong to.
571 TEMPLATE_PARMS is used to specify the template parameters of a member
572 template passed as FUNCTION_DECL. If the member template is passed as a
573 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
574 from the declaration. If the function is not a function template, it
576 It returns the original declaration for the function, or NULL_TREE
577 if no declaration was found (and an error was emitted). */
580 check_classfn (tree ctype, tree function, tree template_parms)
585 if (DECL_USE_TEMPLATE (function)
586 && !(TREE_CODE (function) == TEMPLATE_DECL
587 && DECL_TEMPLATE_SPECIALIZATION (function))
588 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
589 /* Since this is a specialization of a member template,
590 we're not going to find the declaration in the class.
593 struct S { template <typename T> void f(T); };
594 template <> void S::f(int);
596 we're not going to find `S::f(int)', but there's no
597 reason we should, either. We let our callers know we didn't
598 find the method, but we don't complain. */
601 /* Basic sanity check: for a template function, the template parameters
602 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
603 if (TREE_CODE (function) == TEMPLATE_DECL)
605 gcc_assert (!template_parms
606 || comp_template_parms (template_parms,
607 DECL_TEMPLATE_PARMS (function)));
608 template_parms = DECL_TEMPLATE_PARMS (function);
611 /* OK, is this a definition of a member template? */
612 is_template = (template_parms != NULL_TREE);
614 ix = class_method_index_for_fn (complete_type (ctype), function);
617 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
618 tree fndecls, fndecl = 0;
621 const char *format = NULL;
623 pushed_scope = push_scope (ctype);
624 for (fndecls = VEC_index (tree, methods, ix);
625 fndecls; fndecls = OVL_NEXT (fndecls))
629 fndecl = OVL_CURRENT (fndecls);
630 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
631 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
633 /* We cannot simply call decls_match because this doesn't
634 work for static member functions that are pretending to
635 be methods, and because the name may have been changed by
638 /* Get rid of the this parameter on functions that become
640 if (DECL_STATIC_FUNCTION_P (fndecl)
641 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
642 p1 = TREE_CHAIN (p1);
644 /* A member template definition only matches a member template
646 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
649 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
650 TREE_TYPE (TREE_TYPE (fndecl)))
651 && compparms (p1, p2)
653 || comp_template_parms (template_parms,
654 DECL_TEMPLATE_PARMS (fndecl)))
655 && (DECL_TEMPLATE_SPECIALIZATION (function)
656 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
657 && (!DECL_TEMPLATE_SPECIALIZATION (function)
658 || (DECL_TI_TEMPLATE (function)
659 == DECL_TI_TEMPLATE (fndecl))))
663 pop_scope (pushed_scope);
665 return OVL_CURRENT (fndecls);
666 error ("prototype for %q#D does not match any in class %qT",
668 is_conv_op = DECL_CONV_FN_P (fndecl);
671 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
672 fndecls = VEC_index (tree, methods, ix);
675 fndecl = OVL_CURRENT (fndecls);
676 fndecls = OVL_NEXT (fndecls);
678 if (!fndecls && is_conv_op)
680 if (VEC_length (tree, methods) > (size_t) ++ix)
682 fndecls = VEC_index (tree, methods, ix);
683 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
695 format = "candidates are: %#D";
697 format = "candidate is: %#D";
698 cp_error_at (format, fndecl);
701 else if (!COMPLETE_TYPE_P (ctype))
702 cxx_incomplete_type_error (function, ctype);
704 error ("no %q#D member function declared in class %qT",
707 /* If we did not find the method in the class, add it to avoid
708 spurious errors (unless the CTYPE is not yet defined, in which
709 case we'll only confuse ourselves when the function is declared
710 properly within the class. */
711 if (COMPLETE_TYPE_P (ctype))
712 add_method (ctype, function);
716 /* DECL is a function with vague linkage. Remember it so that at the
717 end of the translation unit we can decide whether or not to emit
721 note_vague_linkage_fn (tree decl)
723 if (!DECL_DEFERRED_FN (decl))
725 DECL_DEFERRED_FN (decl) = 1;
726 DECL_DEFER_OUTPUT (decl) = 1;
727 VEC_safe_push (tree, gc, deferred_fns, decl);
731 /* Like note_vague_linkage_fn but for variables. */
734 note_vague_linkage_var (tree var)
736 VEC_safe_push (tree, gc, pending_statics, var);
739 /* We have just processed the DECL, which is a static data member.
740 Its initializer, if present, is INIT. The ASMSPEC_TREE, if
741 present, is the assembly-language name for the data member.
742 FLAGS is as for cp_finish_decl. */
745 finish_static_data_member_decl (tree decl, tree init, tree asmspec_tree,
748 gcc_assert (TREE_PUBLIC (decl));
750 DECL_CONTEXT (decl) = current_class_type;
752 /* We cannot call pushdecl here, because that would fill in the
753 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
754 the right thing, namely, to put this decl out straight away. */
755 /* current_class_type can be NULL_TREE in case of error. */
756 if (!asmspec_tree && current_class_type)
757 DECL_INITIAL (decl) = error_mark_node;
759 if (! processing_template_decl)
760 note_vague_linkage_var (decl);
762 if (LOCAL_CLASS_P (current_class_type))
763 pedwarn ("local class %q#T shall not have static data member %q#D",
764 current_class_type, decl);
766 /* Static consts need not be initialized in the class definition. */
767 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
769 static int explained = 0;
771 error ("initializer invalid for static member with constructor");
774 error ("(an out of class initialization is required)");
779 /* Force the compiler to know when an uninitialized static const
780 member is being used. */
781 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
782 TREE_USED (decl) = 1;
783 DECL_INITIAL (decl) = init;
784 DECL_IN_AGGR_P (decl) = 1;
786 cp_finish_decl (decl, init, asmspec_tree, flags);
789 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
790 of a structure component, returning a _DECL node.
791 QUALS is a list of type qualifiers for this decl (such as for declaring
792 const member functions).
794 This is done during the parsing of the struct declaration.
795 The _DECL nodes are chained together and the lot of them
796 are ultimately passed to `build_struct' to make the RECORD_TYPE node.
798 If class A defines that certain functions in class B are friends, then
799 the way I have set things up, it is B who is interested in permission
800 granted by A. However, it is in A's context that these declarations
801 are parsed. By returning a void_type_node, class A does not attempt
802 to incorporate the declarations of the friends within its structure.
804 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
805 CHANGES TO CODE IN `start_method'. */
808 grokfield (const cp_declarator *declarator,
809 cp_decl_specifier_seq *declspecs,
810 tree init, tree asmspec_tree,
814 const char *asmspec = 0;
815 int flags = LOOKUP_ONLYCONVERTING;
817 if (!declspecs->any_specifiers_p
818 && declarator->kind == cdk_id
819 && declarator->u.id.qualifying_scope
820 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
821 /* Access declaration */
822 return do_class_using_decl (declarator->u.id.qualifying_scope,
823 declarator->u.id.unqualified_name);
826 && TREE_CODE (init) == TREE_LIST
827 && TREE_VALUE (init) == error_mark_node
828 && TREE_CHAIN (init) == NULL_TREE)
831 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
832 if (! value || error_operand_p (value))
833 /* friend or constructor went bad. */
834 return error_mark_node;
836 if (TREE_CODE (value) == TYPE_DECL && init)
838 error ("typedef %qD is initialized (use __typeof__ instead)", value);
842 /* Pass friendly classes back. */
843 if (value == void_type_node)
846 /* Pass friend decls back. */
847 if ((TREE_CODE (value) == FUNCTION_DECL
848 || TREE_CODE (value) == TEMPLATE_DECL)
849 && DECL_CONTEXT (value) != current_class_type)
852 if (DECL_NAME (value) != NULL_TREE
853 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
854 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
855 error ("member %qD conflicts with virtual function table field name",
858 /* Stash away type declarations. */
859 if (TREE_CODE (value) == TYPE_DECL)
861 DECL_NONLOCAL (value) = 1;
862 DECL_CONTEXT (value) = current_class_type;
864 if (processing_template_decl)
865 value = push_template_decl (value);
869 /* Avoid storing attributes in template parameters:
870 tsubst is not ready to handle them. */
871 tree type = TREE_TYPE (value);
872 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
873 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
874 sorry ("applying attributes to template parameters is not implemented");
876 cplus_decl_attributes (&value, attrlist, 0);
882 if (DECL_IN_AGGR_P (value))
884 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
885 return void_type_node;
889 asmspec = TREE_STRING_POINTER (asmspec_tree);
893 if (TREE_CODE (value) == FUNCTION_DECL)
895 /* Initializers for functions are rejected early in the parser.
896 If we get here, it must be a pure specifier for a method. */
897 gcc_assert (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE);
898 gcc_assert (error_operand_p (init) || integer_zerop (init));
899 DECL_PURE_VIRTUAL_P (value) = 1;
901 else if (pedantic && TREE_CODE (value) != VAR_DECL)
902 /* Already complained in grokdeclarator. */
906 /* We allow initializers to become parameters to base
908 if (TREE_CODE (init) == TREE_LIST)
910 if (TREE_CHAIN (init) == NULL_TREE)
911 init = TREE_VALUE (init);
913 init = digest_init (TREE_TYPE (value), init, (tree *)0);
916 if (!processing_template_decl)
918 if (TREE_CODE (init) == CONSTRUCTOR)
919 init = digest_init (TREE_TYPE (value), init, (tree *)0);
921 init = integral_constant_value (init);
923 if (init != error_mark_node && ! TREE_CONSTANT (init))
925 /* We can allow references to things that are effectively
926 static, since references are initialized with the
928 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
929 || (TREE_STATIC (init) == 0
930 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
932 error ("field initializer is not constant");
933 init = error_mark_node;
940 if (processing_template_decl
941 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
943 value = push_template_decl (value);
944 if (error_operand_p (value))
945 return error_mark_node;
949 cplus_decl_attributes (&value, attrlist, 0);
951 switch (TREE_CODE (value))
954 finish_static_data_member_decl (value, init, asmspec_tree,
960 error ("%<asm%> specifiers are not permitted on non-static data members");
961 if (DECL_INITIAL (value) == error_mark_node)
962 init = error_mark_node;
963 cp_finish_decl (value, init, NULL_TREE, flags);
964 DECL_INITIAL (value) = init;
965 DECL_IN_AGGR_P (value) = 1;
970 set_user_assembler_name (value, asmspec);
971 if (!DECL_FRIEND_P (value))
972 grok_special_member_properties (value);
974 cp_finish_decl (value, init, asmspec_tree, flags);
976 /* Pass friends back this way. */
977 if (DECL_FRIEND_P (value))
978 return void_type_node;
980 DECL_IN_AGGR_P (value) = 1;
989 /* Like `grokfield', but for bitfields.
990 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
993 grokbitfield (const cp_declarator *declarator,
994 cp_decl_specifier_seq *declspecs, tree width)
996 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
998 if (! value) return NULL_TREE; /* friends went bad. */
1000 /* Pass friendly classes back. */
1001 if (TREE_CODE (value) == VOID_TYPE)
1002 return void_type_node;
1004 if (TREE_CODE (value) == TYPE_DECL)
1006 error ("cannot declare %qD to be a bit-field type", value);
1010 /* Usually, finish_struct_1 catches bitfields with invalid types.
1011 But, in the case of bitfields with function type, we confuse
1012 ourselves into thinking they are member functions, so we must
1014 if (TREE_CODE (value) == FUNCTION_DECL)
1016 error ("cannot declare bit-field %qD with function type",
1021 if (DECL_IN_AGGR_P (value))
1023 error ("%qD is already defined in the class %qT", value,
1024 DECL_CONTEXT (value));
1025 return void_type_node;
1028 if (TREE_STATIC (value))
1030 error ("static member %qD cannot be a bit-field", value);
1033 cp_finish_decl (value, NULL_TREE, NULL_TREE, 0);
1035 if (width != error_mark_node)
1037 constant_expression_warning (width);
1038 DECL_INITIAL (value) = width;
1039 SET_DECL_C_BIT_FIELD (value);
1042 DECL_IN_AGGR_P (value) = 1;
1048 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1050 if (*decl == NULL_TREE || *decl == void_type_node)
1053 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1054 decl = &DECL_TEMPLATE_RESULT (*decl);
1056 decl_attributes (decl, attributes, flags);
1058 if (TREE_CODE (*decl) == TYPE_DECL)
1059 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1062 /* Walks through the namespace- or function-scope anonymous union
1063 OBJECT, with the indicated TYPE, building appropriate ALIAS_DECLs.
1064 Returns one of the fields for use in the mangled name. */
1067 build_anon_union_vars (tree type, tree object)
1069 tree main_decl = NULL_TREE;
1072 /* Rather than write the code to handle the non-union case,
1073 just give an error. */
1074 if (TREE_CODE (type) != UNION_TYPE)
1075 error ("anonymous struct not inside named type");
1077 for (field = TYPE_FIELDS (type);
1079 field = TREE_CHAIN (field))
1084 if (DECL_ARTIFICIAL (field))
1086 if (TREE_CODE (field) != FIELD_DECL)
1088 cp_pedwarn_at ("%q#D invalid; an anonymous union can only "
1089 "have non-static data members",
1094 if (TREE_PRIVATE (field))
1095 cp_pedwarn_at ("private member %q#D in anonymous union", field);
1096 else if (TREE_PROTECTED (field))
1097 cp_pedwarn_at ("protected member %q#D in anonymous union", field);
1099 if (processing_template_decl)
1100 ref = build_min_nt (COMPONENT_REF, object,
1101 DECL_NAME (field), NULL_TREE);
1103 ref = build_class_member_access_expr (object, field, NULL_TREE,
1106 if (DECL_NAME (field))
1108 decl = build_decl (ALIAS_DECL, DECL_NAME (field), TREE_TYPE (field));
1109 DECL_INITIAL (decl) = ref;
1110 TREE_PUBLIC (decl) = 0;
1111 TREE_STATIC (decl) = 0;
1112 DECL_EXTERNAL (decl) = 1;
1113 decl = pushdecl (decl);
1115 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1116 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1120 if (main_decl == NULL_TREE)
1127 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1128 anonymous union, then all members must be laid out together. PUBLIC_P
1129 is nonzero if this union is not declared static. */
1132 finish_anon_union (tree anon_union_decl)
1138 if (anon_union_decl == error_mark_node)
1141 type = TREE_TYPE (anon_union_decl);
1142 public_p = TREE_PUBLIC (anon_union_decl);
1144 /* The VAR_DECL's context is the same as the TYPE's context. */
1145 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1147 if (TYPE_FIELDS (type) == NULL_TREE)
1152 error ("namespace-scope anonymous aggregates must be static");
1156 main_decl = build_anon_union_vars (type, anon_union_decl);
1157 if (main_decl == NULL_TREE)
1159 warning (0, "anonymous union with no members");
1163 if (!processing_template_decl)
1165 /* Use main_decl to set the mangled name. */
1166 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1167 mangle_decl (anon_union_decl);
1168 DECL_NAME (anon_union_decl) = NULL_TREE;
1171 pushdecl (anon_union_decl);
1172 if (building_stmt_tree ()
1173 && at_function_scope_p ())
1174 add_decl_expr (anon_union_decl);
1175 else if (!processing_template_decl)
1176 rest_of_decl_compilation (anon_union_decl,
1177 toplevel_bindings_p (), at_eof);
1180 /* Auxiliary functions to make type signatures for
1181 `operator new' and `operator delete' correspond to
1182 what compiler will be expecting. */
1185 coerce_new_type (tree type)
1188 tree args = TYPE_ARG_TYPES (type);
1190 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1192 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1195 error ("%<operator new%> must return type %qT", ptr_type_node);
1198 if (!args || args == void_list_node
1199 || !same_type_p (TREE_VALUE (args), size_type_node))
1202 if (args && args != void_list_node)
1203 args = TREE_CHAIN (args);
1204 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1205 "as first parameter", size_type_node);
1210 args = tree_cons (NULL_TREE, size_type_node, args);
1213 type = build_exception_variant
1214 (build_function_type (ptr_type_node, args),
1215 TYPE_RAISES_EXCEPTIONS (type));
1223 coerce_delete_type (tree type)
1226 tree args = TYPE_ARG_TYPES (type);
1228 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1230 if (!same_type_p (TREE_TYPE (type), void_type_node))
1233 error ("%<operator delete%> must return type %qT", void_type_node);
1236 if (!args || args == void_list_node
1237 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1240 if (args && args != void_list_node)
1241 args = TREE_CHAIN (args);
1242 error ("%<operator delete%> takes type %qT as first parameter",
1248 args = tree_cons (NULL_TREE, ptr_type_node, args);
1251 type = build_exception_variant
1252 (build_function_type (void_type_node, args),
1253 TYPE_RAISES_EXCEPTIONS (type));
1262 mark_vtable_entries (tree decl)
1264 tree entries = CONSTRUCTOR_ELTS (DECL_INITIAL (decl));
1266 for (; entries; entries = TREE_CHAIN (entries))
1268 tree fnaddr = TREE_VALUE (entries);
1271 STRIP_NOPS (fnaddr);
1273 if (TREE_CODE (fnaddr) != ADDR_EXPR
1274 && TREE_CODE (fnaddr) != FDESC_EXPR)
1275 /* This entry is an offset: a virtual base class offset, a
1276 virtual call offset, an RTTI offset, etc. */
1279 fn = TREE_OPERAND (fnaddr, 0);
1280 TREE_ADDRESSABLE (fn) = 1;
1281 /* When we don't have vcall offsets, we output thunks whenever
1282 we output the vtables that contain them. With vcall offsets,
1283 we know all the thunks we'll need when we emit a virtual
1284 function, so we emit the thunks there instead. */
1285 if (DECL_THUNK_P (fn))
1286 use_thunk (fn, /*emit_p=*/0);
1291 /* Set DECL up to have the closest approximation of "initialized common"
1292 linkage available. */
1295 comdat_linkage (tree decl)
1298 make_decl_one_only (decl);
1299 else if (TREE_CODE (decl) == FUNCTION_DECL
1300 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1301 /* We can just emit function and compiler-generated variables
1302 statically; having multiple copies is (for the most part) only
1305 There are two correctness issues, however: the address of a
1306 template instantiation with external linkage should be the
1307 same, independent of what translation unit asks for the
1308 address, and this will not hold when we emit multiple copies of
1309 the function. However, there's little else we can do.
1311 Also, by default, the typeinfo implementation assumes that
1312 there will be only one copy of the string used as the name for
1313 each type. Therefore, if weak symbols are unavailable, the
1314 run-time library should perform a more conservative check; it
1315 should perform a string comparison, rather than an address
1317 TREE_PUBLIC (decl) = 0;
1320 /* Static data member template instantiations, however, cannot
1321 have multiple copies. */
1322 if (DECL_INITIAL (decl) == 0
1323 || DECL_INITIAL (decl) == error_mark_node)
1324 DECL_COMMON (decl) = 1;
1325 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1327 DECL_COMMON (decl) = 1;
1328 DECL_INITIAL (decl) = error_mark_node;
1330 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1332 /* We can't do anything useful; leave vars for explicit
1334 DECL_EXTERNAL (decl) = 1;
1335 DECL_NOT_REALLY_EXTERN (decl) = 0;
1339 if (DECL_LANG_SPECIFIC (decl))
1340 DECL_COMDAT (decl) = 1;
1343 /* For win32 we also want to put explicit instantiations in
1344 linkonce sections, so that they will be merged with implicit
1345 instantiations; otherwise we get duplicate symbol errors.
1346 For Darwin we do not want explicit instantiations to be
1350 maybe_make_one_only (tree decl)
1352 /* We used to say that this was not necessary on targets that support weak
1353 symbols, because the implicit instantiations will defer to the explicit
1354 one. However, that's not actually the case in SVR4; a strong definition
1355 after a weak one is an error. Also, not making explicit
1356 instantiations one_only means that we can end up with two copies of
1357 some template instantiations. */
1361 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1362 we can get away with not emitting them if they aren't used. We need
1363 to for variables so that cp_finish_decl will update their linkage,
1364 because their DECL_INITIAL may not have been set properly yet. */
1366 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1367 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1368 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1370 make_decl_one_only (decl);
1372 if (TREE_CODE (decl) == VAR_DECL)
1374 DECL_COMDAT (decl) = 1;
1375 /* Mark it needed so we don't forget to emit it. */
1376 mark_decl_referenced (decl);
1381 /* Determine whether or not we want to specifically import or export CTYPE,
1382 using various heuristics. */
1385 import_export_class (tree ctype)
1387 /* -1 for imported, 1 for exported. */
1388 int import_export = 0;
1390 /* It only makes sense to call this function at EOF. The reason is
1391 that this function looks at whether or not the first non-inline
1392 non-abstract virtual member function has been defined in this
1393 translation unit. But, we can't possibly know that until we've
1394 seen the entire translation unit. */
1395 gcc_assert (at_eof);
1397 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1400 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1401 we will have CLASSTYPE_INTERFACE_ONLY set but not
1402 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1403 heuristic because someone will supply a #pragma implementation
1404 elsewhere, and deducing it here would produce a conflict. */
1405 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1408 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1410 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1412 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1413 && !flag_implicit_templates)
1414 /* For a template class, without -fimplicit-templates, check the
1415 repository. If the virtual table is assigned to this
1416 translation unit, then export the class; otherwise, import
1418 import_export = repo_export_class_p (ctype) ? 1 : -1;
1419 else if (TYPE_POLYMORPHIC_P (ctype))
1421 /* The ABI specifies that the virtual table and associated
1422 information are emitted with the key method, if any. */
1423 tree method = CLASSTYPE_KEY_METHOD (ctype);
1424 /* If weak symbol support is not available, then we must be
1425 careful not to emit the vtable when the key function is
1426 inline. An inline function can be defined in multiple
1427 translation units. If we were to emit the vtable in each
1428 translation unit containing a definition, we would get
1429 multiple definition errors at link-time. */
1430 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1431 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1434 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1435 a definition anywhere else. */
1436 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1439 /* Allow backends the chance to overrule the decision. */
1440 if (targetm.cxx.import_export_class)
1441 import_export = targetm.cxx.import_export_class (ctype, import_export);
1445 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1446 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1450 /* Return true if VAR has already been provided to the back end; in that
1451 case VAR should not be modified further by the front end. */
1453 var_finalized_p (tree var)
1455 return cgraph_varpool_node (var)->finalized;
1458 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1459 must be emitted in this translation unit. Mark it as such. */
1462 mark_needed (tree decl)
1464 /* It's possible that we no longer need to set
1465 TREE_SYMBOL_REFERENCED here directly, but doing so is
1467 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1468 mark_decl_referenced (decl);
1471 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1472 returns true if a definition of this entity should be provided in
1473 this object file. Callers use this function to determine whether
1474 or not to let the back end know that a definition of DECL is
1475 available in this translation unit. */
1478 decl_needed_p (tree decl)
1480 gcc_assert (TREE_CODE (decl) == VAR_DECL
1481 || TREE_CODE (decl) == FUNCTION_DECL);
1482 /* This function should only be called at the end of the translation
1483 unit. We cannot be sure of whether or not something will be
1484 COMDAT until that point. */
1485 gcc_assert (at_eof);
1487 /* All entities with external linkage that are not COMDAT should be
1488 emitted; they may be referred to from other object files. */
1489 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1491 /* If this entity was used, let the back-end see it; it will decide
1492 whether or not to emit it into the object file. */
1493 if (TREE_USED (decl)
1494 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1495 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1497 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1498 reference to DECL might cause it to be emitted later. */
1502 /* If necessary, write out the vtables for the dynamic class CTYPE.
1503 Returns true if any vtables were emitted. */
1506 maybe_emit_vtables (tree ctype)
1512 /* If the vtables for this class have already been emitted there is
1513 nothing more to do. */
1514 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1515 if (var_finalized_p (primary_vtbl))
1517 /* Ignore dummy vtables made by get_vtable_decl. */
1518 if (TREE_TYPE (primary_vtbl) == void_type_node)
1521 /* On some targets, we cannot determine the key method until the end
1522 of the translation unit -- which is when this function is
1524 if (!targetm.cxx.key_method_may_be_inline ())
1525 determine_key_method (ctype);
1527 /* See if any of the vtables are needed. */
1528 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1530 import_export_decl (vtbl);
1531 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1536 /* If the references to this class' vtables are optimized away,
1537 still emit the appropriate debugging information. See
1539 if (DECL_COMDAT (primary_vtbl)
1540 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1541 note_debug_info_needed (ctype);
1545 /* The ABI requires that we emit all of the vtables if we emit any
1547 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1549 /* Mark entities references from the virtual table as used. */
1550 mark_vtable_entries (vtbl);
1552 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1554 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1556 /* It had better be all done at compile-time. */
1561 DECL_EXTERNAL (vtbl) = 0;
1562 rest_of_decl_compilation (vtbl, 1, 1);
1564 /* Because we're only doing syntax-checking, we'll never end up
1565 actually marking the variable as written. */
1566 if (flag_syntax_only)
1567 TREE_ASM_WRITTEN (vtbl) = 1;
1570 /* Since we're writing out the vtable here, also write the debug
1572 note_debug_info_needed (ctype);
1577 /* Like c_determine_visibility, but with additional C++-specific
1581 determine_visibility (tree decl)
1585 /* Cloned constructors and destructors get the same visibility as
1586 the underlying function. That should be set up in
1587 maybe_clone_body. */
1588 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1590 /* Give the common code a chance to make a determination. */
1591 if (c_determine_visibility (decl))
1594 /* If DECL is a member of a class, visibility specifiers on the
1595 class can influence the visibility of the DECL. */
1596 if (DECL_CLASS_SCOPE_P (decl))
1597 class_type = DECL_CONTEXT (decl);
1598 else if (TREE_CODE (decl) == VAR_DECL
1599 && DECL_TINFO_P (decl)
1600 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1601 class_type = TREE_TYPE (DECL_NAME (decl));
1604 /* Virtual tables have DECL_CONTEXT set to their associated class,
1605 so they are automatically handled above. */
1606 gcc_assert (TREE_CODE (decl) != VAR_DECL
1607 || !DECL_VTABLE_OR_VTT_P (decl));
1608 /* Entities not associated with any class just get the
1609 visibility specified by their attributes. */
1613 /* By default, static data members and function members receive
1614 the visibility of their containing class. */
1617 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1618 && lookup_attribute ("dllexport", TYPE_ATTRIBUTES (class_type)))
1620 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1621 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1623 else if (TREE_CODE (decl) == FUNCTION_DECL
1624 && DECL_DECLARED_INLINE_P (decl)
1625 && visibility_options.inlines_hidden)
1627 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1628 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1630 else if (CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1632 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1633 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1635 else if (!DECL_VISIBILITY_SPECIFIED (decl))
1637 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1638 DECL_VISIBILITY_SPECIFIED (decl) = 0;
1643 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1644 for DECL has not already been determined, do so now by setting
1645 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1646 function is called entities with vague linkage whose definitions
1647 are available must have TREE_PUBLIC set.
1649 If this function decides to place DECL in COMDAT, it will set
1650 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1651 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1652 callers defer that decision until it is clear that DECL is actually
1656 import_export_decl (tree decl)
1661 tree class_type = NULL_TREE;
1663 if (DECL_INTERFACE_KNOWN (decl))
1666 /* We cannot determine what linkage to give to an entity with vague
1667 linkage until the end of the file. For example, a virtual table
1668 for a class will be defined if and only if the key method is
1669 defined in this translation unit. As a further example, consider
1670 that when compiling a translation unit that uses PCH file with
1671 "-frepo" it would be incorrect to make decisions about what
1672 entities to emit when building the PCH; those decisions must be
1673 delayed until the repository information has been processed. */
1674 gcc_assert (at_eof);
1675 /* Object file linkage for explicit instantiations is handled in
1676 mark_decl_instantiated. For static variables in functions with
1677 vague linkage, maybe_commonize_var is used.
1679 Therefore, the only declarations that should be provided to this
1680 function are those with external linkage that are:
1682 * implicit instantiations of function templates
1686 * implicit instantiations of static data members of class
1693 Furthermore, all entities that reach this point must have a
1694 definition available in this translation unit.
1696 The following assertions check these conditions. */
1697 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1698 || TREE_CODE (decl) == VAR_DECL);
1699 /* Any code that creates entities with TREE_PUBLIC cleared should
1700 also set DECL_INTERFACE_KNOWN. */
1701 gcc_assert (TREE_PUBLIC (decl));
1702 if (TREE_CODE (decl) == FUNCTION_DECL)
1703 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1704 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1705 || DECL_DECLARED_INLINE_P (decl));
1707 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1708 || DECL_VTABLE_OR_VTT_P (decl)
1709 || DECL_TINFO_P (decl));
1710 /* Check that a definition of DECL is available in this translation
1712 gcc_assert (!DECL_REALLY_EXTERN (decl));
1714 /* Assume that DECL will not have COMDAT linkage. */
1716 /* Assume that DECL will not be imported into this translation
1720 /* See if the repository tells us whether or not to emit DECL in
1721 this translation unit. */
1722 emit_p = repo_emit_p (decl);
1725 else if (emit_p == 1)
1727 /* The repository indicates that this entity should be defined
1728 here. Make sure the back end honors that request. */
1729 if (TREE_CODE (decl) == VAR_DECL)
1731 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1732 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1735 FOR_EACH_CLONE (clone, decl)
1736 mark_needed (clone);
1740 /* Output the definition as an ordinary strong definition. */
1741 DECL_EXTERNAL (decl) = 0;
1742 DECL_INTERFACE_KNOWN (decl) = 1;
1747 /* We have already decided what to do with this DECL; there is no
1748 need to check anything further. */
1750 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1752 class_type = DECL_CONTEXT (decl);
1753 import_export_class (class_type);
1754 if (TYPE_FOR_JAVA (class_type))
1756 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
1757 && CLASSTYPE_INTERFACE_ONLY (class_type))
1759 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1760 && !CLASSTYPE_USE_TEMPLATE (class_type)
1761 && CLASSTYPE_KEY_METHOD (class_type)
1762 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
1763 /* The ABI requires that all virtual tables be emitted with
1764 COMDAT linkage. However, on systems where COMDAT symbols
1765 don't show up in the table of contents for a static
1766 archive, or on systems without weak symbols (where we
1767 approximate COMDAT linkage by using internal linkage), the
1768 linker will report errors about undefined symbols because
1769 it will not see the virtual table definition. Therefore,
1770 in the case that we know that the virtual table will be
1771 emitted in only one translation unit, we make the virtual
1772 table an ordinary definition with external linkage. */
1773 DECL_EXTERNAL (decl) = 0;
1774 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
1776 /* CLASS_TYPE is being exported from this translation unit,
1777 so DECL should be defined here. */
1778 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
1779 /* If a class is declared in a header with the "extern
1780 template" extension, then it will not be instantiated,
1781 even in translation units that would normally require
1782 it. Often such classes are explicitly instantiated in
1783 one translation unit. Therefore, the explicit
1784 instantiation must be made visible to other translation
1786 DECL_EXTERNAL (decl) = 0;
1789 /* The generic C++ ABI says that class data is always
1790 COMDAT, even if there is a key function. Some
1791 variants (e.g., the ARM EABI) says that class data
1792 only has COMDAT linkage if the the class data might
1793 be emitted in more than one translation unit. */
1794 if (!CLASSTYPE_KEY_METHOD (class_type)
1795 || targetm.cxx.class_data_always_comdat ())
1797 /* The ABI requires COMDAT linkage. Normally, we
1798 only emit COMDAT things when they are needed;
1799 make sure that we realize that this entity is
1806 else if (!flag_implicit_templates
1807 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
1812 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1814 tree type = TREE_TYPE (DECL_NAME (decl));
1815 if (CLASS_TYPE_P (type))
1818 import_export_class (type);
1819 if (CLASSTYPE_INTERFACE_KNOWN (type)
1820 && TYPE_POLYMORPHIC_P (type)
1821 && CLASSTYPE_INTERFACE_ONLY (type)
1822 /* If -fno-rtti was specified, then we cannot be sure
1823 that RTTI information will be emitted with the
1824 virtual table of the class, so we must emit it
1825 wherever it is used. */
1830 if (CLASSTYPE_INTERFACE_KNOWN (type)
1831 && !CLASSTYPE_INTERFACE_ONLY (type))
1833 comdat_p = targetm.cxx.class_data_always_comdat ();
1838 DECL_EXTERNAL (decl) = 0;
1848 else if (DECL_TEMPLATE_INSTANTIATION (decl)
1849 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1851 /* DECL is an implicit instantiation of a function or static
1853 if (flag_implicit_templates
1854 || (flag_implicit_inline_templates
1855 && TREE_CODE (decl) == FUNCTION_DECL
1856 && DECL_DECLARED_INLINE_P (decl)))
1859 /* If we are not implicitly generating templates, then mark
1860 this entity as undefined in this translation unit. */
1863 else if (DECL_FUNCTION_MEMBER_P (decl))
1865 if (!DECL_DECLARED_INLINE_P (decl))
1867 tree ctype = DECL_CONTEXT (decl);
1868 import_export_class (ctype);
1869 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1871 DECL_NOT_REALLY_EXTERN (decl)
1872 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1873 || (DECL_DECLARED_INLINE_P (decl)
1874 && ! flag_implement_inlines
1875 && !DECL_VINDEX (decl)));
1877 if (!DECL_NOT_REALLY_EXTERN (decl))
1878 DECL_EXTERNAL (decl) = 1;
1880 /* Always make artificials weak. */
1881 if (DECL_ARTIFICIAL (decl) && flag_weak)
1884 maybe_make_one_only (decl);
1895 /* If we are importing DECL into this translation unit, mark is
1896 an undefined here. */
1897 DECL_EXTERNAL (decl) = 1;
1898 DECL_NOT_REALLY_EXTERN (decl) = 0;
1902 /* If we decided to put DECL in COMDAT, mark it accordingly at
1904 comdat_linkage (decl);
1907 /* Give the target a chance to override the visibility associated
1909 if (TREE_CODE (decl) == VAR_DECL
1910 && (DECL_TINFO_P (decl)
1911 || (DECL_VTABLE_OR_VTT_P (decl)
1912 /* Construction virtual tables are not exported because
1913 they cannot be referred to from other object files;
1914 their name is not standardized by the ABI. */
1915 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1916 && TREE_PUBLIC (decl)
1917 && !DECL_REALLY_EXTERN (decl)
1918 && DECL_VISIBILITY_SPECIFIED (decl)
1919 && (!class_type || !CLASSTYPE_VISIBILITY_SPECIFIED (class_type)))
1920 targetm.cxx.determine_class_data_visibility (decl);
1922 DECL_INTERFACE_KNOWN (decl) = 1;
1925 /* Return an expression that performs the destruction of DECL, which
1926 must be a VAR_DECL whose type has a non-trivial destructor, or is
1927 an array whose (innermost) elements have a non-trivial destructor. */
1930 build_cleanup (tree decl)
1933 tree type = TREE_TYPE (decl);
1935 /* This function should only be called for declarations that really
1936 require cleanups. */
1937 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
1939 /* Treat all objects with destructors as used; the destructor may do
1940 something substantive. */
1943 if (TREE_CODE (type) == ARRAY_TYPE)
1947 cxx_mark_addressable (decl);
1948 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1950 temp = build_delete (TREE_TYPE (temp), temp,
1951 sfk_complete_destructor,
1952 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1956 /* Returns the initialization guard variable for the variable DECL,
1957 which has static storage duration. */
1960 get_guard (tree decl)
1965 sname = mangle_guard_variable (decl);
1966 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1971 /* We use a type that is big enough to contain a mutex as well
1972 as an integer counter. */
1973 guard_type = targetm.cxx.guard_type ();
1974 guard = build_decl (VAR_DECL, sname, guard_type);
1976 /* The guard should have the same linkage as what it guards. */
1977 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1978 TREE_STATIC (guard) = TREE_STATIC (decl);
1979 DECL_COMMON (guard) = DECL_COMMON (decl);
1980 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1981 if (TREE_PUBLIC (decl))
1982 DECL_WEAK (guard) = DECL_WEAK (decl);
1984 DECL_ARTIFICIAL (guard) = 1;
1985 DECL_IGNORED_P (guard) = 1;
1986 TREE_USED (guard) = 1;
1987 pushdecl_top_level_and_finish (guard, NULL_TREE);
1992 /* Return those bits of the GUARD variable that should be set when the
1993 guarded entity is actually initialized. */
1996 get_guard_bits (tree guard)
1998 if (!targetm.cxx.guard_mask_bit ())
2000 /* We only set the first byte of the guard, in order to leave room
2001 for a mutex in the high-order bits. */
2002 guard = build1 (ADDR_EXPR,
2003 build_pointer_type (TREE_TYPE (guard)),
2005 guard = build1 (NOP_EXPR,
2006 build_pointer_type (char_type_node),
2008 guard = build1 (INDIRECT_REF, char_type_node, guard);
2014 /* Return an expression which determines whether or not the GUARD
2015 variable has already been initialized. */
2018 get_guard_cond (tree guard)
2022 /* Check to see if the GUARD is zero. */
2023 guard = get_guard_bits (guard);
2025 /* Mask off all but the low bit. */
2026 if (targetm.cxx.guard_mask_bit ())
2028 guard_value = integer_one_node;
2029 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2030 guard_value = convert (TREE_TYPE (guard), guard_value);
2031 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2034 guard_value = integer_zero_node;
2035 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2036 guard_value = convert (TREE_TYPE (guard), guard_value);
2037 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2040 /* Return an expression which sets the GUARD variable, indicating that
2041 the variable being guarded has been initialized. */
2044 set_guard (tree guard)
2048 /* Set the GUARD to one. */
2049 guard = get_guard_bits (guard);
2050 guard_init = integer_one_node;
2051 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2052 guard_init = convert (TREE_TYPE (guard), guard_init);
2053 return build_modify_expr (guard, NOP_EXPR, guard_init);
2056 /* Start the process of running a particular set of global constructors
2057 or destructors. Subroutine of do_[cd]tors. */
2060 start_objects (int method_type, int initp)
2066 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2068 if (initp != DEFAULT_INIT_PRIORITY)
2078 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2081 sprintf (type, "%c", method_type);
2083 fndecl = build_lang_decl (FUNCTION_DECL,
2084 get_file_function_name_long (type),
2085 build_function_type (void_type_node,
2087 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2089 /* It can be a static function as long as collect2 does not have
2090 to scan the object file to find its ctor/dtor routine. */
2091 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2093 /* Mark this declaration as used to avoid spurious warnings. */
2094 TREE_USED (current_function_decl) = 1;
2096 /* Mark this function as a global constructor or destructor. */
2097 if (method_type == 'I')
2098 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2100 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2101 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2103 body = begin_compound_stmt (BCS_FN_BODY);
2105 /* We cannot allow these functions to be elided, even if they do not
2106 have external linkage. And, there's no point in deferring
2107 compilation of thes functions; they're all going to have to be
2109 DECL_INLINE (current_function_decl) = 0;
2110 DECL_UNINLINABLE (current_function_decl) = 1;
2115 /* Finish the process of running a particular set of global constructors
2116 or destructors. Subroutine of do_[cd]tors. */
2119 finish_objects (int method_type, int initp, tree body)
2124 finish_compound_stmt (body);
2125 fn = finish_function (0);
2126 expand_or_defer_fn (fn);
2128 /* When only doing semantic analysis, and no RTL generation, we
2129 can't call functions that directly emit assembly code; there is
2130 no assembly file in which to put the code. */
2131 if (flag_syntax_only)
2134 if (targetm.have_ctors_dtors)
2136 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2137 cgraph_mark_needed_node (cgraph_node (fn));
2138 if (method_type == 'I')
2139 (* targetm.asm_out.constructor) (fnsym, initp);
2141 (* targetm.asm_out.destructor) (fnsym, initp);
2145 /* The names of the parameters to the function created to handle
2146 initializations and destructions for objects with static storage
2148 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2149 #define PRIORITY_IDENTIFIER "__priority"
2151 /* The name of the function we create to handle initializations and
2152 destructions for objects with static storage duration. */
2153 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2155 /* The declaration for the __INITIALIZE_P argument. */
2156 static GTY(()) tree initialize_p_decl;
2158 /* The declaration for the __PRIORITY argument. */
2159 static GTY(()) tree priority_decl;
2161 /* The declaration for the static storage duration function. */
2162 static GTY(()) tree ssdf_decl;
2164 /* All the static storage duration functions created in this
2165 translation unit. */
2166 static GTY(()) VEC(tree,gc) *ssdf_decls;
2168 /* A map from priority levels to information about that priority
2169 level. There may be many such levels, so efficient lookup is
2171 static splay_tree priority_info_map;
2173 /* Begins the generation of the function that will handle all
2174 initialization and destruction of objects with static storage
2175 duration. The function generated takes two parameters of type
2176 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2177 nonzero, it performs initializations. Otherwise, it performs
2178 destructions. It only performs those initializations or
2179 destructions with the indicated __PRIORITY. The generated function
2182 It is assumed that this function will only be called once per
2183 translation unit. */
2186 start_static_storage_duration_function (unsigned count)
2191 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2193 /* Create the identifier for this function. It will be of the form
2194 SSDF_IDENTIFIER_<number>. */
2195 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2197 /* Create the parameters. */
2198 parm_types = void_list_node;
2199 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2200 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2201 type = build_function_type (void_type_node, parm_types);
2203 /* Create the FUNCTION_DECL itself. */
2204 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2205 get_identifier (id),
2207 TREE_PUBLIC (ssdf_decl) = 0;
2208 DECL_ARTIFICIAL (ssdf_decl) = 1;
2210 /* Put this function in the list of functions to be called from the
2211 static constructors and destructors. */
2214 ssdf_decls = VEC_alloc (tree, gc, 32);
2216 /* Take this opportunity to initialize the map from priority
2217 numbers to information about that priority level. */
2218 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2219 /*delete_key_fn=*/0,
2220 /*delete_value_fn=*/
2221 (splay_tree_delete_value_fn) &free);
2223 /* We always need to generate functions for the
2224 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2225 priorities later, we'll be sure to find the
2226 DEFAULT_INIT_PRIORITY. */
2227 get_priority_info (DEFAULT_INIT_PRIORITY);
2230 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2232 /* Create the argument list. */
2233 initialize_p_decl = cp_build_parm_decl
2234 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2235 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2236 TREE_USED (initialize_p_decl) = 1;
2237 priority_decl = cp_build_parm_decl
2238 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2239 DECL_CONTEXT (priority_decl) = ssdf_decl;
2240 TREE_USED (priority_decl) = 1;
2242 TREE_CHAIN (initialize_p_decl) = priority_decl;
2243 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2245 /* Put the function in the global scope. */
2246 pushdecl (ssdf_decl);
2248 /* Start the function itself. This is equivalent to declaring the
2251 static void __ssdf (int __initialize_p, init __priority_p);
2253 It is static because we only need to call this function from the
2254 various constructor and destructor functions for this module. */
2255 start_preparsed_function (ssdf_decl,
2256 /*attrs=*/NULL_TREE,
2259 /* Set up the scope of the outermost block in the function. */
2260 body = begin_compound_stmt (BCS_FN_BODY);
2262 /* This function must not be deferred because we are depending on
2263 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2264 DECL_INLINE (ssdf_decl) = 0;
2265 DECL_UNINLINABLE (ssdf_decl) = 1;
2270 /* Finish the generation of the function which performs initialization
2271 and destruction of objects with static storage duration. After
2272 this point, no more such objects can be created. */
2275 finish_static_storage_duration_function (tree body)
2277 /* Close out the function. */
2278 finish_compound_stmt (body);
2279 expand_or_defer_fn (finish_function (0));
2282 /* Return the information about the indicated PRIORITY level. If no
2283 code to handle this level has yet been generated, generate the
2284 appropriate prologue. */
2286 static priority_info
2287 get_priority_info (int priority)
2292 n = splay_tree_lookup (priority_info_map,
2293 (splay_tree_key) priority);
2296 /* Create a new priority information structure, and insert it
2298 pi = xmalloc (sizeof (struct priority_info_s));
2299 pi->initializations_p = 0;
2300 pi->destructions_p = 0;
2301 splay_tree_insert (priority_info_map,
2302 (splay_tree_key) priority,
2303 (splay_tree_value) pi);
2306 pi = (priority_info) n->value;
2311 /* Set up to handle the initialization or destruction of DECL. If
2312 INITP is nonzero, we are initializing the variable. Otherwise, we
2313 are destroying it. */
2316 start_static_initialization_or_destruction (tree decl, int initp)
2318 tree guard_if_stmt = NULL_TREE;
2325 /* Figure out the priority for this declaration. */
2326 priority = DECL_INIT_PRIORITY (decl);
2328 priority = DEFAULT_INIT_PRIORITY;
2330 /* Remember that we had an initialization or finalization at this
2332 pi = get_priority_info (priority);
2334 pi->initializations_p = 1;
2336 pi->destructions_p = 1;
2338 /* Trick the compiler into thinking we are at the file and line
2339 where DECL was declared so that error-messages make sense, and so
2340 that the debugger will show somewhat sensible file and line
2342 input_location = DECL_SOURCE_LOCATION (decl);
2348 Access control for implicit calls to the constructors,
2349 the conversion functions, or the destructor called to
2350 create and destroy a static data member is performed as
2351 if these calls appeared in the scope of the member's
2354 we pretend we are in a static member function of the class of
2355 which the DECL is a member. */
2356 if (member_p (decl))
2358 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2359 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2362 /* Conditionalize this initialization on being in the right priority
2363 and being initializing/finalizing appropriately. */
2364 guard_if_stmt = begin_if_stmt ();
2365 cond = cp_build_binary_op (EQ_EXPR,
2367 build_int_cst (NULL_TREE, priority));
2368 init_cond = initp ? integer_one_node : integer_zero_node;
2369 init_cond = cp_build_binary_op (EQ_EXPR,
2372 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, init_cond);
2374 /* Assume we don't need a guard. */
2376 /* We need a guard if this is an object with external linkage that
2377 might be initialized in more than one place. (For example, a
2378 static data member of a template, when the data member requires
2380 if (TREE_PUBLIC (decl) && (DECL_COMMON (decl)
2381 || DECL_ONE_ONLY (decl)
2382 || DECL_WEAK (decl)))
2386 guard = get_guard (decl);
2388 /* When using __cxa_atexit, we just check the GUARD as we would
2389 for a local static. */
2390 if (flag_use_cxa_atexit)
2392 /* When using __cxa_atexit, we never try to destroy
2393 anything from a static destructor. */
2395 guard_cond = get_guard_cond (guard);
2397 /* If we don't have __cxa_atexit, then we will be running
2398 destructors from .fini sections, or their equivalents. So,
2399 we need to know how many times we've tried to initialize this
2400 object. We do initializations only if the GUARD is zero,
2401 i.e., if we are the first to initialize the variable. We do
2402 destructions only if the GUARD is one, i.e., if we are the
2403 last to destroy the variable. */
2406 = cp_build_binary_op (EQ_EXPR,
2407 build_unary_op (PREINCREMENT_EXPR,
2413 = cp_build_binary_op (EQ_EXPR,
2414 build_unary_op (PREDECREMENT_EXPR,
2419 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, guard_cond);
2422 finish_if_stmt_cond (cond, guard_if_stmt);
2424 /* If we're using __cxa_atexit, we have not already set the GUARD,
2425 so we must do so now. */
2426 if (guard && initp && flag_use_cxa_atexit)
2427 finish_expr_stmt (set_guard (guard));
2429 return guard_if_stmt;
2432 /* We've just finished generating code to do an initialization or
2433 finalization. GUARD_IF_STMT is the if-statement we used to guard
2434 the initialization. */
2437 finish_static_initialization_or_destruction (tree guard_if_stmt)
2439 finish_then_clause (guard_if_stmt);
2440 finish_if_stmt (guard_if_stmt);
2442 /* Now that we're done with DECL we don't need to pretend to be a
2443 member of its class any longer. */
2444 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2445 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2448 /* Generate code to do the initialization of DECL, a VAR_DECL with
2449 static storage duration. The initialization is INIT. */
2452 do_static_initialization (tree decl, tree init)
2456 /* Set up for the initialization. */
2458 = start_static_initialization_or_destruction (decl,
2461 /* Perform the initialization. */
2463 finish_expr_stmt (init);
2465 /* If we're using __cxa_atexit, register a function that calls the
2466 destructor for the object. */
2467 if (flag_use_cxa_atexit)
2468 finish_expr_stmt (register_dtor_fn (decl));
2471 finish_static_initialization_or_destruction (guard_if_stmt);
2474 /* Generate code to do the static destruction of DECL. If DECL may be
2475 initialized more than once in different object files, GUARD is the
2476 guard variable to check. PRIORITY is the priority for the
2480 do_static_destruction (tree decl)
2484 /* If we're using __cxa_atexit, then destructors are registered
2485 immediately after objects are initialized. */
2486 gcc_assert (!flag_use_cxa_atexit);
2488 /* If we don't need a destructor, there's nothing to do. */
2489 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2492 /* Actually do the destruction. */
2493 guard_if_stmt = start_static_initialization_or_destruction (decl,
2495 finish_expr_stmt (build_cleanup (decl));
2496 finish_static_initialization_or_destruction (guard_if_stmt);
2499 /* VARS is a list of variables with static storage duration which may
2500 need initialization and/or finalization. Remove those variables
2501 that don't really need to be initialized or finalized, and return
2502 the resulting list. The order in which the variables appear in
2503 VARS is in reverse order of the order in which they should actually
2504 be initialized. The list we return is in the unreversed order;
2505 i.e., the first variable should be initialized first. */
2508 prune_vars_needing_no_initialization (tree *vars)
2511 tree result = NULL_TREE;
2516 tree decl = TREE_VALUE (t);
2517 tree init = TREE_PURPOSE (t);
2519 /* Deal gracefully with error. */
2520 if (decl == error_mark_node)
2522 var = &TREE_CHAIN (t);
2526 /* The only things that can be initialized are variables. */
2527 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2529 /* If this object is not defined, we don't need to do anything
2531 if (DECL_EXTERNAL (decl))
2533 var = &TREE_CHAIN (t);
2537 /* Also, if the initializer already contains errors, we can bail
2539 if (init && TREE_CODE (init) == TREE_LIST
2540 && value_member (error_mark_node, init))
2542 var = &TREE_CHAIN (t);
2546 /* This variable is going to need initialization and/or
2547 finalization, so we add it to the list. */
2548 *var = TREE_CHAIN (t);
2549 TREE_CHAIN (t) = result;
2556 /* Make sure we have told the back end about all the variables in
2560 write_out_vars (tree vars)
2564 for (v = vars; v; v = TREE_CHAIN (v))
2566 tree var = TREE_VALUE (v);
2567 if (!var_finalized_p (var))
2569 import_export_decl (var);
2570 rest_of_decl_compilation (var, 1, 1);
2575 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2576 (otherwise) that will initialize all gobal objects with static
2577 storage duration having the indicated PRIORITY. */
2580 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2589 input_location = *locus;
2590 #ifdef USE_MAPPED_LOCATION
2596 /* We use `I' to indicate initialization and `D' to indicate
2598 function_key = constructor_p ? 'I' : 'D';
2600 /* We emit the function lazily, to avoid generating empty
2601 global constructors and destructors. */
2604 /* Call the static storage duration function with appropriate
2606 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2608 /* Calls to pure or const functions will expand to nothing. */
2609 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2612 body = start_objects (function_key, priority);
2614 arguments = tree_cons (NULL_TREE,
2615 build_int_cst (NULL_TREE, priority),
2617 arguments = tree_cons (NULL_TREE,
2618 build_int_cst (NULL_TREE, constructor_p),
2620 finish_expr_stmt (build_function_call (fndecl, arguments));
2624 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2625 calls to any functions marked with attributes indicating that
2626 they should be called at initialization- or destruction-time. */
2627 if (priority == DEFAULT_INIT_PRIORITY)
2631 for (fns = constructor_p ? static_ctors : static_dtors;
2633 fns = TREE_CHAIN (fns))
2635 fndecl = TREE_VALUE (fns);
2637 /* Calls to pure/const functions will expand to nothing. */
2638 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2641 body = start_objects (function_key, priority);
2642 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2647 /* Close out the function. */
2649 finish_objects (function_key, priority, body);
2652 /* Generate constructor and destructor functions for the priority
2656 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2658 location_t *locus = data;
2659 int priority = (int) n->key;
2660 priority_info pi = (priority_info) n->value;
2662 /* Generate the functions themselves, but only if they are really
2664 if (pi->initializations_p
2665 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2666 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2667 if (pi->destructions_p
2668 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2669 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2671 /* Keep iterating. */
2675 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2676 decls referenced from frontend specific constructs; it will be called
2677 only for language-specific tree nodes.
2679 Here we must deal with member pointers. */
2682 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2683 tree from ATTRIBUTE_UNUSED)
2687 switch (TREE_CODE (t))
2690 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2691 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2694 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2695 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2698 if (DECL_VTABLE_OR_VTT_P (t))
2700 /* The ABI requires that all virtual tables be emitted
2701 whenever one of them is. */
2703 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2705 vtbl = TREE_CHAIN (vtbl))
2706 mark_decl_referenced (vtbl);
2708 else if (DECL_CONTEXT (t)
2709 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2710 /* If we need a static variable in a function, then we
2711 need the containing function. */
2712 mark_decl_referenced (DECL_CONTEXT (t));
2721 /* This routine is called from the last rule in yyparse ().
2722 Its job is to create all the code needed to initialize and
2723 destroy the global aggregates. We do the destruction
2724 first, since that way we only need to reverse the decls once. */
2727 cp_finish_file (void)
2733 unsigned ssdf_count = 0;
2737 locus = input_location;
2740 /* Bad parse errors. Just forget about it. */
2741 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2745 c_common_write_pch ();
2747 #ifdef USE_MAPPED_LOCATION
2750 /* Otherwise, GDB can get confused, because in only knows
2751 about source for LINENO-1 lines. */
2755 /* We now have to write out all the stuff we put off writing out.
2758 o Template specializations that we have not yet instantiated,
2759 but which are needed.
2760 o Initialization and destruction for non-local objects with
2761 static storage duration. (Local objects with static storage
2762 duration are initialized when their scope is first entered,
2763 and are cleaned up via atexit.)
2764 o Virtual function tables.
2766 All of these may cause others to be needed. For example,
2767 instantiating one function may cause another to be needed, and
2768 generating the initializer for an object may cause templates to be
2769 instantiated, etc., etc. */
2771 timevar_push (TV_VARCONST);
2773 emit_support_tinfos ();
2782 /* If there are templates that we've put off instantiating, do
2784 instantiate_pending_templates (retries);
2787 /* Write out virtual tables as required. Note that writing out
2788 the virtual table for a template class may cause the
2789 instantiation of members of that class. If we write out
2790 vtables then we remove the class from our list so we don't
2791 have to look at it again. */
2793 while (keyed_classes != NULL_TREE
2794 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2797 keyed_classes = TREE_CHAIN (keyed_classes);
2803 tree next = TREE_CHAIN (t);
2807 if (maybe_emit_vtables (TREE_VALUE (next)))
2810 TREE_CHAIN (t) = TREE_CHAIN (next);
2815 next = TREE_CHAIN (t);
2819 /* Write out needed type info variables. We have to be careful
2820 looping through unemitted decls, because emit_tinfo_decl may
2821 cause other variables to be needed. New elements will be
2822 appended, and we remove from the vector those that actually
2824 for (i = VEC_length (tree, unemitted_tinfo_decls);
2825 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
2826 if (emit_tinfo_decl (t))
2829 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
2832 /* The list of objects with static storage duration is built up
2833 in reverse order. We clear STATIC_AGGREGATES so that any new
2834 aggregates added during the initialization of these will be
2835 initialized in the correct order when we next come around the
2837 vars = prune_vars_needing_no_initialization (&static_aggregates);
2843 /* We need to start a new initialization function each time
2844 through the loop. That's because we need to know which
2845 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2846 isn't computed until a function is finished, and written
2847 out. That's a deficiency in the back-end. When this is
2848 fixed, these initialization functions could all become
2849 inline, with resulting performance improvements. */
2852 /* Set the line and file, so that it is obviously not from
2854 input_location = locus;
2855 ssdf_body = start_static_storage_duration_function (ssdf_count);
2857 /* Make sure the back end knows about all the variables. */
2858 write_out_vars (vars);
2860 /* First generate code to do all the initializations. */
2861 for (v = vars; v; v = TREE_CHAIN (v))
2862 do_static_initialization (TREE_VALUE (v),
2865 /* Then, generate code to do all the destructions. Do these
2866 in reverse order so that the most recently constructed
2867 variable is the first destroyed. If we're using
2868 __cxa_atexit, then we don't need to do this; functions
2869 were registered at initialization time to destroy the
2871 if (!flag_use_cxa_atexit)
2873 vars = nreverse (vars);
2874 for (v = vars; v; v = TREE_CHAIN (v))
2875 do_static_destruction (TREE_VALUE (v));
2880 /* Finish up the static storage duration function for this
2882 input_location = locus;
2883 finish_static_storage_duration_function (ssdf_body);
2885 /* All those initializations and finalizations might cause
2886 us to need more inline functions, more template
2887 instantiations, etc. */
2890 #ifdef USE_MAPPED_LOCATION
2897 /* Go through the set of inline functions whose bodies have not
2898 been emitted yet. If out-of-line copies of these functions
2899 are required, emit them. */
2900 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
2902 /* Does it need synthesizing? */
2903 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2904 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2906 /* Even though we're already at the top-level, we push
2907 there again. That way, when we pop back a few lines
2908 hence, all of our state is restored. Otherwise,
2909 finish_function doesn't clean things up, and we end
2910 up with CURRENT_FUNCTION_DECL set. */
2911 push_to_top_level ();
2912 synthesize_method (decl);
2913 pop_from_top_level ();
2917 if (!DECL_SAVED_TREE (decl))
2920 import_export_decl (decl);
2922 /* We lie to the back-end, pretending that some functions
2923 are not defined when they really are. This keeps these
2924 functions from being put out unnecessarily. But, we must
2925 stop lying when the functions are referenced, or if they
2926 are not comdat since they need to be put out now. This
2927 is done in a separate for cycle, because if some deferred
2928 function is contained in another deferred function later
2929 in deferred_fns varray, rest_of_compilation would skip
2930 this function and we really cannot expand the same
2932 if (DECL_NOT_REALLY_EXTERN (decl)
2933 && DECL_INITIAL (decl)
2934 && decl_needed_p (decl))
2935 DECL_EXTERNAL (decl) = 0;
2937 /* If we're going to need to write this function out, and
2938 there's already a body for it, create RTL for it now.
2939 (There might be no body if this is a method we haven't
2940 gotten around to synthesizing yet.) */
2941 if (!DECL_EXTERNAL (decl)
2942 && decl_needed_p (decl)
2943 && !TREE_ASM_WRITTEN (decl)
2944 && !cgraph_node (decl)->local.finalized)
2946 /* We will output the function; no longer consider it in this
2948 DECL_DEFER_OUTPUT (decl) = 0;
2949 /* Generate RTL for this function now that we know we
2951 expand_or_defer_fn (decl);
2952 /* If we're compiling -fsyntax-only pretend that this
2953 function has been written out so that we don't try to
2955 if (flag_syntax_only)
2956 TREE_ASM_WRITTEN (decl) = 1;
2961 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
2964 /* Static data members are just like namespace-scope globals. */
2965 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
2967 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
2969 import_export_decl (decl);
2970 /* If this static data member is needed, provide it to the
2972 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
2973 DECL_EXTERNAL (decl) = 0;
2975 if (VEC_length (tree, pending_statics) != 0
2976 && wrapup_global_declarations (VEC_address (tree, pending_statics),
2977 VEC_length (tree, pending_statics)))
2984 /* All used inline functions must have a definition at this point. */
2985 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
2987 if (/* Check online inline functions that were actually used. */
2988 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
2989 /* But not defined. */
2990 && DECL_REALLY_EXTERN (decl)
2991 /* If we decided to emit this function in another
2992 translation unit, the fact that the definition was
2993 missing here likely indicates only that the repository
2994 decided to place the function elsewhere. With -Winline,
2995 we will still warn if we could not inline the
2997 && !flag_use_repository
2998 /* An explicit instantiation can be used to specify
2999 that the body is in another unit. It will have
3000 already verified there was a definition. */
3001 && !DECL_EXPLICIT_INSTANTIATION (decl))
3003 cp_warning_at ("inline function %qD used but never defined", decl);
3004 /* This symbol is effectively an "extern" declaration now.
3005 This is not strictly necessary, but removes a duplicate
3007 TREE_PUBLIC (decl) = 1;
3011 /* We give C linkage to static constructors and destructors. */
3012 push_lang_context (lang_name_c);
3014 /* Generate initialization and destruction functions for all
3015 priorities for which they are required. */
3016 if (priority_info_map)
3017 splay_tree_foreach (priority_info_map,
3018 generate_ctor_and_dtor_functions_for_priority,
3024 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3025 DEFAULT_INIT_PRIORITY, &locus);
3027 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3028 DEFAULT_INIT_PRIORITY, &locus);
3031 /* We're done with the splay-tree now. */
3032 if (priority_info_map)
3033 splay_tree_delete (priority_info_map);
3035 /* Generate any missing aliases. */
3036 maybe_apply_pending_pragma_weaks ();
3038 /* We're done with static constructors, so we can go back to "C++"
3040 pop_lang_context ();
3042 cgraph_finalize_compilation_unit ();
3045 /* Now, issue warnings about static, but not defined, functions,
3046 etc., and emit debugging information. */
3047 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3048 if (VEC_length (tree, pending_statics) != 0)
3049 check_global_declarations (VEC_address (tree, pending_statics),
3050 VEC_length (tree, pending_statics));
3054 /* The entire file is now complete. If requested, dump everything
3058 FILE *stream = dump_begin (TDI_tu, &flags);
3062 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3063 dump_end (TDI_tu, stream);
3067 timevar_pop (TV_VARCONST);
3069 if (flag_detailed_statistics)
3071 dump_tree_statistics ();
3072 dump_time_statistics ();
3074 input_location = locus;
3076 #ifdef ENABLE_CHECKING
3077 validate_conversion_obstack ();
3078 #endif /* ENABLE_CHECKING */
3081 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3082 function to call in parse-tree form; it has not yet been
3083 semantically analyzed. ARGS are the arguments to the function.
3084 They have already been semantically analyzed. */
3087 build_offset_ref_call_from_tree (tree fn, tree args)
3096 object = TREE_OPERAND (fn, 0);
3098 if (processing_template_decl)
3100 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3101 || TREE_CODE (fn) == MEMBER_REF);
3102 if (type_dependent_expression_p (fn)
3103 || any_type_dependent_arguments_p (args))
3104 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3106 /* Transform the arguments and add the implicit "this"
3107 parameter. That must be done before the FN is transformed
3108 because we depend on the form of FN. */
3109 args = build_non_dependent_args (args);
3110 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3111 object = build_unary_op (ADDR_EXPR, object, 0);
3112 object = build_non_dependent_expr (object);
3113 args = tree_cons (NULL_TREE, object, args);
3114 /* Now that the arguments are done, transform FN. */
3115 fn = build_non_dependent_expr (fn);
3118 /* A qualified name corresponding to a bound pointer-to-member is
3119 represented as an OFFSET_REF:
3121 struct B { void g(); };
3123 void B::g() { (this->*p)(); } */
3124 if (TREE_CODE (fn) == OFFSET_REF)
3126 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3127 fn = TREE_OPERAND (fn, 1);
3128 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3129 args = tree_cons (NULL_TREE, object_addr, args);
3132 expr = build_function_call (fn, args);
3133 if (processing_template_decl && expr != error_mark_node)
3134 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3140 check_default_args (tree x)
3142 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3143 bool saw_def = false;
3144 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3145 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3147 if (TREE_PURPOSE (arg))
3151 cp_error_at ("default argument missing for parameter %P of %q+#D",
3159 mark_used (tree decl)
3161 TREE_USED (decl) = 1;
3162 if (processing_template_decl || skip_evaluation)
3165 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3166 && !TREE_ASM_WRITTEN (decl))
3167 /* Remember it, so we can check it was defined. */
3169 if (DECL_DEFERRED_FN (decl))
3171 note_vague_linkage_fn (decl);
3174 assemble_external (decl);
3176 /* Is it a synthesized method that needs to be synthesized? */
3177 if (TREE_CODE (decl) == FUNCTION_DECL
3178 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3179 && DECL_ARTIFICIAL (decl)
3180 && !DECL_THUNK_P (decl)
3181 && ! DECL_INITIAL (decl)
3182 /* Kludge: don't synthesize for default args. Unfortunately this
3183 rules out initializers of namespace-scoped objects too, but
3184 it's sort-of ok if the implicit ctor or dtor decl keeps
3185 pointing to the class location. */
3186 && current_function_decl)
3188 /* Put the function definition at the position where it is needed,
3189 rather than within the body of the class. That way, an error
3190 during the generation of the implicit body points at the place
3191 where the attempt to generate the function occurs, giving the
3192 user a hint as to why we are attempting to generate the
3194 DECL_SOURCE_LOCATION (decl) = input_location;
3196 synthesize_method (decl);
3197 /* If we've already synthesized the method we don't need to
3198 instantiate it, so we can return right away. */
3202 /* If this is a function or variable that is an instance of some
3203 template, we now know that we will need to actually do the
3204 instantiation. We check that DECL is not an explicit
3205 instantiation because that is not checked in instantiate_decl. */
3206 if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3207 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3208 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3209 || (TREE_CODE (decl) == FUNCTION_DECL
3210 && DECL_INLINE (DECL_TEMPLATE_RESULT
3211 (template_for_substitution (decl))))))
3212 /* We put off instantiating functions in order to improve compile
3213 times. Maintaining a stack of active functions is expensive,
3214 and the inliner knows to instantiate any functions it might
3216 instantiate_decl (decl, /*defer_ok=*/true, /*undefined_ok=*/0);
3219 #include "gt-cp-decl2.h"