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(()) varray_type pending_statics;
90 #define pending_statics_used \
91 (pending_statics ? pending_statics->elements_used : 0)
93 /* A list of functions which were declared inline, but which we
94 may need to emit outline anyway. */
95 static GTY(()) varray_type deferred_fns;
96 #define deferred_fns_used \
97 (deferred_fns ? deferred_fns->elements_used : 0)
99 /* Flag used when debugging spew.c */
101 extern int spew_debug;
103 /* Nonzero if we're done parsing and into end-of-file activities. */
107 /* Functions called along with real static constructors and destructors. */
113 /* Incorporate `const' and `volatile' qualifiers for member functions.
114 FUNCTION is a TYPE_DECL or a FUNCTION_DECL.
115 QUALS is a list of qualifiers. Returns any explicit
116 top-level qualifiers of the method's this pointer, anything other than
117 TYPE_UNQUALIFIED will be an extension. */
120 grok_method_quals (tree ctype, tree function, cp_cv_quals quals)
122 tree fntype = TREE_TYPE (function);
123 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
124 int type_quals = TYPE_UNQUALIFIED;
125 int this_quals = TYPE_UNQUALIFIED;
127 type_quals = quals & ~TYPE_QUAL_RESTRICT;
128 this_quals = quals & TYPE_QUAL_RESTRICT;
130 ctype = cp_build_qualified_type (ctype, type_quals);
131 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
132 (TREE_CODE (fntype) == METHOD_TYPE
133 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
134 : TYPE_ARG_TYPES (fntype)));
136 fntype = build_exception_variant (fntype, raises);
138 TREE_TYPE (function) = fntype;
142 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
146 cp_build_parm_decl (tree name, tree type)
148 tree parm = build_decl (PARM_DECL, name, type);
149 /* DECL_ARG_TYPE is only used by the back end and the back end never
151 if (!processing_template_decl)
152 DECL_ARG_TYPE (parm) = type_passed_as (type);
156 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
160 build_artificial_parm (tree name, tree type)
162 tree parm = cp_build_parm_decl (name, type);
163 DECL_ARTIFICIAL (parm) = 1;
164 /* All our artificial parms are implicitly `const'; they cannot be
166 TREE_READONLY (parm) = 1;
170 /* Constructors for types with virtual baseclasses need an "in-charge" flag
171 saying whether this constructor is responsible for initialization of
172 virtual baseclasses or not. All destructors also need this "in-charge"
173 flag, which additionally determines whether or not the destructor should
174 free the memory for the object.
176 This function adds the "in-charge" flag to member function FN if
177 appropriate. It is called from grokclassfn and tsubst.
178 FN must be either a constructor or destructor.
180 The in-charge flag follows the 'this' parameter, and is followed by the
181 VTT parm (if any), then the user-written parms. */
184 maybe_retrofit_in_chrg (tree fn)
186 tree basetype, arg_types, parms, parm, fntype;
188 /* If we've already add the in-charge parameter don't do it again. */
189 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
192 /* When processing templates we can't know, in general, whether or
193 not we're going to have virtual baseclasses. */
194 if (processing_template_decl)
197 /* We don't need an in-charge parameter for constructors that don't
198 have virtual bases. */
199 if (DECL_CONSTRUCTOR_P (fn)
200 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
203 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
204 basetype = TREE_TYPE (TREE_VALUE (arg_types));
205 arg_types = TREE_CHAIN (arg_types);
207 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
209 /* If this is a subobject constructor or destructor, our caller will
210 pass us a pointer to our VTT. */
211 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
213 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
215 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
216 TREE_CHAIN (parm) = parms;
219 /* ...and then to TYPE_ARG_TYPES. */
220 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
222 DECL_HAS_VTT_PARM_P (fn) = 1;
225 /* Then add the in-charge parm (before the VTT parm). */
226 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
227 TREE_CHAIN (parm) = parms;
229 arg_types = hash_tree_chain (integer_type_node, arg_types);
231 /* Insert our new parameter(s) into the list. */
232 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
234 /* And rebuild the function type. */
235 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
237 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
238 fntype = build_exception_variant (fntype,
239 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
240 TREE_TYPE (fn) = fntype;
242 /* Now we've got the in-charge parameter. */
243 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
246 /* Classes overload their constituent function names automatically.
247 When a function name is declared in a record structure,
248 its name is changed to it overloaded name. Since names for
249 constructors and destructors can conflict, we place a leading
252 CNAME is the name of the class we are grokking for.
254 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
256 FLAGS contains bits saying what's special about today's
257 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
259 If FUNCTION is a destructor, then we must add the `auto-delete' field
260 as a second parameter. There is some hair associated with the fact
261 that we must "declare" this variable in the manner consistent with the
262 way the rest of the arguments were declared.
264 QUALS are the qualifiers for the this pointer. */
267 grokclassfn (tree ctype, tree function, enum overload_flags flags,
270 tree fn_name = DECL_NAME (function);
271 cp_cv_quals this_quals = TYPE_UNQUALIFIED;
273 /* Even within an `extern "C"' block, members get C++ linkage. See
274 [dcl.link] for details. */
275 SET_DECL_LANGUAGE (function, lang_cplusplus);
277 if (fn_name == NULL_TREE)
279 error ("name missing for member function");
280 fn_name = get_identifier ("<anonymous>");
281 DECL_NAME (function) = fn_name;
285 this_quals = grok_method_quals (ctype, function, quals);
287 if (TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
289 /* Must add the class instance variable up front. */
290 /* Right now we just make this a pointer. But later
291 we may wish to make it special. */
292 tree type = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (function)));
296 /* The `this' parameter is implicitly `const'; it cannot be
298 this_quals |= TYPE_QUAL_CONST;
299 qual_type = cp_build_qualified_type (type, this_quals);
300 parm = build_artificial_parm (this_identifier, qual_type);
301 cp_apply_type_quals_to_decl (this_quals, parm);
302 TREE_CHAIN (parm) = DECL_ARGUMENTS (function);
303 DECL_ARGUMENTS (function) = parm;
306 DECL_CONTEXT (function) = ctype;
308 if (flags == DTOR_FLAG)
309 DECL_DESTRUCTOR_P (function) = 1;
311 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
312 maybe_retrofit_in_chrg (function);
315 /* Create an ARRAY_REF, checking for the user doing things backwards
319 grok_array_decl (tree array_expr, tree index_exp)
323 tree orig_array_expr = array_expr;
324 tree orig_index_exp = index_exp;
326 if (error_operand_p (array_expr) || error_operand_p (index_exp))
327 return error_mark_node;
329 if (processing_template_decl)
331 if (type_dependent_expression_p (array_expr)
332 || type_dependent_expression_p (index_exp))
333 return build_min_nt (ARRAY_REF, array_expr, index_exp,
334 NULL_TREE, NULL_TREE);
335 array_expr = build_non_dependent_expr (array_expr);
336 index_exp = build_non_dependent_expr (index_exp);
339 type = TREE_TYPE (array_expr);
341 type = non_reference (type);
343 /* If they have an `operator[]', use that. */
344 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
345 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
346 array_expr, index_exp, NULL_TREE,
347 /*overloaded_p=*/NULL);
352 /* Otherwise, create an ARRAY_REF for a pointer or array type.
353 It is a little-known fact that, if `a' is an array and `i' is
354 an int, you can write `i[a]', which means the same thing as
356 if (TREE_CODE (type) == ARRAY_TYPE)
359 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
361 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
364 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
366 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
368 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
371 if ((p1 && i2) && (i1 && p2))
372 error ("ambiguous conversion for array subscript");
375 array_expr = p1, index_exp = i2;
377 array_expr = p2, index_exp = i1;
380 error ("invalid types %<%T[%T]%> for array subscript",
381 type, TREE_TYPE (index_exp));
382 return error_mark_node;
385 if (array_expr == error_mark_node || index_exp == error_mark_node)
386 error ("ambiguous conversion for array subscript");
388 expr = build_array_ref (array_expr, index_exp);
390 if (processing_template_decl && expr != error_mark_node)
391 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
392 NULL_TREE, NULL_TREE);
396 /* Given the cast expression EXP, checking out its validity. Either return
397 an error_mark_node if there was an unavoidable error, return a cast to
398 void for trying to delete a pointer w/ the value 0, or return the
399 call to delete. If DOING_VEC is true, we handle things differently
400 for doing an array delete.
401 Implements ARM $5.3.4. This is called from the parser. */
404 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
408 if (exp == error_mark_node)
411 if (processing_template_decl)
413 t = build_min (DELETE_EXPR, void_type_node, exp, size);
414 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
415 DELETE_EXPR_USE_VEC (t) = doing_vec;
416 TREE_SIDE_EFFECTS (t) = 1;
420 /* An array can't have been allocated by new, so complain. */
421 if (TREE_CODE (exp) == VAR_DECL
422 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
423 warning ("deleting array %q#D", exp);
425 t = build_expr_type_conversion (WANT_POINTER, exp, true);
427 if (t == NULL_TREE || t == error_mark_node)
429 error ("type %q#T argument given to %<delete%>, expected pointer",
431 return error_mark_node;
434 type = TREE_TYPE (t);
436 /* As of Valley Forge, you can delete a pointer to const. */
438 /* You can't delete functions. */
439 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
441 error ("cannot delete a function. Only pointer-to-objects are "
442 "valid arguments to %<delete%>");
443 return error_mark_node;
446 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
447 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
449 warning ("deleting %qT is undefined", type);
453 /* Deleting a pointer with the value zero is valid and has no effect. */
454 if (integer_zerop (t))
455 return build1 (NOP_EXPR, void_type_node, t);
458 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
459 sfk_deleting_destructor,
462 return build_delete (type, t, sfk_deleting_destructor,
463 LOOKUP_NORMAL, use_global_delete);
466 /* Report an error if the indicated template declaration is not the
467 sort of thing that should be a member template. */
470 check_member_template (tree tmpl)
474 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
475 decl = DECL_TEMPLATE_RESULT (tmpl);
477 if (TREE_CODE (decl) == FUNCTION_DECL
478 || (TREE_CODE (decl) == TYPE_DECL
479 && IS_AGGR_TYPE (TREE_TYPE (decl))))
481 if (current_function_decl)
482 /* 14.5.2.2 [temp.mem]
484 A local class shall not have member templates. */
485 error ("invalid declaration of member template %q#D in local class",
488 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VIRTUAL_P (decl))
490 /* 14.5.2.3 [temp.mem]
492 A member function template shall not be virtual. */
494 ("invalid use of %<virtual%> in template declaration of %q#D",
496 DECL_VIRTUAL_P (decl) = 0;
499 /* The debug-information generating code doesn't know what to do
500 with member templates. */
501 DECL_IGNORED_P (tmpl) = 1;
504 error ("template declaration of %q#D", decl);
507 /* Return true iff TYPE is a valid Java parameter or return type. */
510 acceptable_java_type (tree type)
512 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
514 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
516 type = TREE_TYPE (type);
517 if (TREE_CODE (type) == RECORD_TYPE)
520 if (! TYPE_FOR_JAVA (type))
522 if (! CLASSTYPE_TEMPLATE_INFO (type))
524 args = CLASSTYPE_TI_ARGS (type);
525 i = TREE_VEC_LENGTH (args);
528 type = TREE_VEC_ELT (args, i);
529 if (TREE_CODE (type) == POINTER_TYPE)
530 type = TREE_TYPE (type);
531 if (! TYPE_FOR_JAVA (type))
540 /* For a METHOD in a Java class CTYPE, return true if
541 the parameter and return types are valid Java types.
542 Otherwise, print appropriate error messages, and return false. */
545 check_java_method (tree method)
548 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
549 tree ret_type = TREE_TYPE (TREE_TYPE (method));
551 if (!acceptable_java_type (ret_type))
553 error ("Java method %qD has non-Java return type %qT",
558 arg_types = TREE_CHAIN (arg_types);
559 if (DECL_HAS_IN_CHARGE_PARM_P (method))
560 arg_types = TREE_CHAIN (arg_types);
561 if (DECL_HAS_VTT_PARM_P (method))
562 arg_types = TREE_CHAIN (arg_types);
564 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
566 tree type = TREE_VALUE (arg_types);
567 if (!acceptable_java_type (type))
569 error ("Java method %qD has non-Java parameter type %qT",
577 /* Sanity check: report error if this function FUNCTION is not
578 really a member of the class (CTYPE) it is supposed to belong to.
579 TEMPLATE_PARMS is used to specify the template parameters of a member
580 template passed as FUNCTION_DECL. If the member template is passed as a
581 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
582 from the declaration. If the function is not a function template, it
584 It returns the original declaration for the function, or NULL_TREE
585 if no declaration was found (and an error was emitted). */
588 check_classfn (tree ctype, tree function, tree template_parms)
593 if (DECL_USE_TEMPLATE (function)
594 && !(TREE_CODE (function) == TEMPLATE_DECL
595 && DECL_TEMPLATE_SPECIALIZATION (function))
596 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
597 /* Since this is a specialization of a member template,
598 we're not going to find the declaration in the class.
601 struct S { template <typename T> void f(T); };
602 template <> void S::f(int);
604 we're not going to find `S::f(int)', but there's no
605 reason we should, either. We let our callers know we didn't
606 find the method, but we don't complain. */
609 /* Basic sanity check: for a template function, the template parameters
610 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
611 if (TREE_CODE (function) == TEMPLATE_DECL)
613 gcc_assert (!template_parms
614 || comp_template_parms (template_parms,
615 DECL_TEMPLATE_PARMS (function)));
616 template_parms = DECL_TEMPLATE_PARMS (function);
619 /* OK, is this a definition of a member template? */
620 is_template = (template_parms != NULL_TREE);
622 ix = class_method_index_for_fn (complete_type (ctype), function);
625 VEC(tree) *methods = CLASSTYPE_METHOD_VEC (ctype);
626 tree fndecls, fndecl = 0;
629 const char *format = NULL;
631 pushed_scope = push_scope (ctype);
632 for (fndecls = VEC_index (tree, methods, ix);
633 fndecls; fndecls = OVL_NEXT (fndecls))
637 fndecl = OVL_CURRENT (fndecls);
638 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
639 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
641 /* We cannot simply call decls_match because this doesn't
642 work for static member functions that are pretending to
643 be methods, and because the name may have been changed by
646 /* Get rid of the this parameter on functions that become
648 if (DECL_STATIC_FUNCTION_P (fndecl)
649 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
650 p1 = TREE_CHAIN (p1);
652 /* A member template definition only matches a member template
654 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
657 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
658 TREE_TYPE (TREE_TYPE (fndecl)))
659 && compparms (p1, p2)
661 || comp_template_parms (template_parms,
662 DECL_TEMPLATE_PARMS (fndecl)))
663 && (DECL_TEMPLATE_SPECIALIZATION (function)
664 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
665 && (!DECL_TEMPLATE_SPECIALIZATION (function)
666 || (DECL_TI_TEMPLATE (function)
667 == DECL_TI_TEMPLATE (fndecl))))
671 pop_scope (pushed_scope);
673 return OVL_CURRENT (fndecls);
674 error ("prototype for %q#D does not match any in class %qT",
676 is_conv_op = DECL_CONV_FN_P (fndecl);
679 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
680 fndecls = VEC_index (tree, methods, ix);
683 fndecl = OVL_CURRENT (fndecls);
684 fndecls = OVL_NEXT (fndecls);
686 if (!fndecls && is_conv_op)
688 if (VEC_length (tree, methods) > (size_t) ++ix)
690 fndecls = VEC_index (tree, methods, ix);
691 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
703 format = "candidates are: %#D";
705 format = "candidate is: %#D";
706 cp_error_at (format, fndecl);
709 else if (!COMPLETE_TYPE_P (ctype))
710 cxx_incomplete_type_error (function, ctype);
712 error ("no %q#D member function declared in class %qT",
715 /* If we did not find the method in the class, add it to avoid
716 spurious errors (unless the CTYPE is not yet defined, in which
717 case we'll only confuse ourselves when the function is declared
718 properly within the class. */
719 if (COMPLETE_TYPE_P (ctype))
720 add_method (ctype, function);
724 /* DECL is a function with vague linkage. Remember it so that at the
725 end of the translation unit we can decide whether or not to emit
729 note_vague_linkage_fn (tree decl)
731 if (!DECL_DEFERRED_FN (decl))
733 DECL_DEFERRED_FN (decl) = 1;
734 DECL_DEFER_OUTPUT (decl) = 1;
736 VARRAY_TREE_INIT (deferred_fns, 32, "deferred_fns");
737 VARRAY_PUSH_TREE (deferred_fns, decl);
741 /* Like note_vague_linkage_fn but for variables. */
744 note_vague_linkage_var (tree var)
746 if (!pending_statics)
747 VARRAY_TREE_INIT (pending_statics, 32, "pending_statics");
748 VARRAY_PUSH_TREE (pending_statics, var);
751 /* We have just processed the DECL, which is a static data member.
752 Its initializer, if present, is INIT. The ASMSPEC_TREE, if
753 present, is the assembly-language name for the data member.
754 FLAGS is as for cp_finish_decl. */
757 finish_static_data_member_decl (tree decl, tree init, tree asmspec_tree,
760 gcc_assert (TREE_PUBLIC (decl));
762 DECL_CONTEXT (decl) = current_class_type;
764 /* We cannot call pushdecl here, because that would fill in the
765 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
766 the right thing, namely, to put this decl out straight away. */
767 /* current_class_type can be NULL_TREE in case of error. */
768 if (!asmspec_tree && current_class_type)
769 DECL_INITIAL (decl) = error_mark_node;
771 if (! processing_template_decl)
772 note_vague_linkage_var (decl);
774 if (LOCAL_CLASS_P (current_class_type))
775 pedwarn ("local class %q#T shall not have static data member %q#D",
776 current_class_type, decl);
778 /* Static consts need not be initialized in the class definition. */
779 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
781 static int explained = 0;
783 error ("initializer invalid for static member with constructor");
786 error ("(an out of class initialization is required)");
791 /* Force the compiler to know when an uninitialized static const
792 member is being used. */
793 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
794 TREE_USED (decl) = 1;
795 DECL_INITIAL (decl) = init;
796 DECL_IN_AGGR_P (decl) = 1;
798 cp_finish_decl (decl, init, asmspec_tree, flags);
801 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
802 of a structure component, returning a _DECL node.
803 QUALS is a list of type qualifiers for this decl (such as for declaring
804 const member functions).
806 This is done during the parsing of the struct declaration.
807 The _DECL nodes are chained together and the lot of them
808 are ultimately passed to `build_struct' to make the RECORD_TYPE node.
810 If class A defines that certain functions in class B are friends, then
811 the way I have set things up, it is B who is interested in permission
812 granted by A. However, it is in A's context that these declarations
813 are parsed. By returning a void_type_node, class A does not attempt
814 to incorporate the declarations of the friends within its structure.
816 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
817 CHANGES TO CODE IN `start_method'. */
820 grokfield (const cp_declarator *declarator,
821 cp_decl_specifier_seq *declspecs,
822 tree init, tree asmspec_tree,
826 const char *asmspec = 0;
827 int flags = LOOKUP_ONLYCONVERTING;
829 if (!declspecs->any_specifiers_p
830 && declarator->kind == cdk_id
831 && declarator->u.id.qualifying_scope
832 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
833 /* Access declaration */
834 return do_class_using_decl (declarator->u.id.qualifying_scope,
835 declarator->u.id.unqualified_name);
838 && TREE_CODE (init) == TREE_LIST
839 && TREE_VALUE (init) == error_mark_node
840 && TREE_CHAIN (init) == NULL_TREE)
843 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
844 if (! value || error_operand_p (value))
845 /* friend or constructor went bad. */
846 return error_mark_node;
848 if (TREE_CODE (value) == TYPE_DECL && init)
850 error ("typedef %qD is initialized (use __typeof__ instead)", value);
854 /* Pass friendly classes back. */
855 if (value == void_type_node)
858 /* Pass friend decls back. */
859 if ((TREE_CODE (value) == FUNCTION_DECL
860 || TREE_CODE (value) == TEMPLATE_DECL)
861 && DECL_CONTEXT (value) != current_class_type)
864 if (DECL_NAME (value) != NULL_TREE
865 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
866 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
867 error ("member %qD conflicts with virtual function table field name",
870 /* Stash away type declarations. */
871 if (TREE_CODE (value) == TYPE_DECL)
873 DECL_NONLOCAL (value) = 1;
874 DECL_CONTEXT (value) = current_class_type;
876 if (processing_template_decl)
877 value = push_template_decl (value);
881 /* Avoid storing attributes in template parameters:
882 tsubst is not ready to handle them. */
883 tree type = TREE_TYPE (value);
884 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
885 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
886 sorry ("applying attributes to template parameters is not implemented");
888 cplus_decl_attributes (&value, attrlist, 0);
894 if (DECL_IN_AGGR_P (value))
896 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
897 return void_type_node;
901 asmspec = TREE_STRING_POINTER (asmspec_tree);
905 if (TREE_CODE (value) == FUNCTION_DECL)
907 /* Initializers for functions are rejected early in the parser.
908 If we get here, it must be a pure specifier for a method. */
909 gcc_assert (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE);
910 gcc_assert (error_operand_p (init) || integer_zerop (init));
911 DECL_PURE_VIRTUAL_P (value) = 1;
913 else if (pedantic && TREE_CODE (value) != VAR_DECL)
914 /* Already complained in grokdeclarator. */
918 /* We allow initializers to become parameters to base
920 if (TREE_CODE (init) == TREE_LIST)
922 if (TREE_CHAIN (init) == NULL_TREE)
923 init = TREE_VALUE (init);
925 init = digest_init (TREE_TYPE (value), init, (tree *)0);
928 if (!processing_template_decl)
930 if (TREE_CODE (init) == CONSTRUCTOR)
931 init = digest_init (TREE_TYPE (value), init, (tree *)0);
933 init = integral_constant_value (init);
935 if (init != error_mark_node && ! TREE_CONSTANT (init))
937 /* We can allow references to things that are effectively
938 static, since references are initialized with the
940 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
941 || (TREE_STATIC (init) == 0
942 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
944 error ("field initializer is not constant");
945 init = error_mark_node;
952 if (processing_template_decl
953 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
955 value = push_template_decl (value);
956 if (error_operand_p (value))
957 return error_mark_node;
961 cplus_decl_attributes (&value, attrlist, 0);
963 switch (TREE_CODE (value))
966 finish_static_data_member_decl (value, init, asmspec_tree,
972 error ("%<asm%> specifiers are not permitted on non-static data members");
973 if (DECL_INITIAL (value) == error_mark_node)
974 init = error_mark_node;
975 cp_finish_decl (value, init, NULL_TREE, flags);
976 DECL_INITIAL (value) = init;
977 DECL_IN_AGGR_P (value) = 1;
982 set_user_assembler_name (value, asmspec);
983 if (!DECL_FRIEND_P (value))
984 grok_special_member_properties (value);
986 cp_finish_decl (value, init, asmspec_tree, flags);
988 /* Pass friends back this way. */
989 if (DECL_FRIEND_P (value))
990 return void_type_node;
992 DECL_IN_AGGR_P (value) = 1;
1001 /* Like `grokfield', but for bitfields.
1002 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1005 grokbitfield (const cp_declarator *declarator,
1006 cp_decl_specifier_seq *declspecs, tree width)
1008 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
1010 if (! value) return NULL_TREE; /* friends went bad. */
1012 /* Pass friendly classes back. */
1013 if (TREE_CODE (value) == VOID_TYPE)
1014 return void_type_node;
1016 if (TREE_CODE (value) == TYPE_DECL)
1018 error ("cannot declare %qD to be a bit-field type", value);
1022 /* Usually, finish_struct_1 catches bitfields with invalid types.
1023 But, in the case of bitfields with function type, we confuse
1024 ourselves into thinking they are member functions, so we must
1026 if (TREE_CODE (value) == FUNCTION_DECL)
1028 error ("cannot declare bit-field %qD with function type",
1033 if (DECL_IN_AGGR_P (value))
1035 error ("%qD is already defined in the class %qT", value,
1036 DECL_CONTEXT (value));
1037 return void_type_node;
1040 if (TREE_STATIC (value))
1042 error ("static member %qD cannot be a bit-field", value);
1045 cp_finish_decl (value, NULL_TREE, NULL_TREE, 0);
1047 if (width != error_mark_node)
1049 constant_expression_warning (width);
1050 DECL_INITIAL (value) = width;
1051 SET_DECL_C_BIT_FIELD (value);
1054 DECL_IN_AGGR_P (value) = 1;
1060 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1062 if (*decl == NULL_TREE || *decl == void_type_node)
1065 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1066 decl = &DECL_TEMPLATE_RESULT (*decl);
1068 decl_attributes (decl, attributes, flags);
1070 if (TREE_CODE (*decl) == TYPE_DECL)
1071 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1074 /* Walks through the namespace- or function-scope anonymous union
1075 OBJECT, with the indicated TYPE, building appropriate ALIAS_DECLs.
1076 Returns one of the fields for use in the mangled name. */
1079 build_anon_union_vars (tree type, tree object)
1081 tree main_decl = NULL_TREE;
1084 /* Rather than write the code to handle the non-union case,
1085 just give an error. */
1086 if (TREE_CODE (type) != UNION_TYPE)
1087 error ("anonymous struct not inside named type");
1089 for (field = TYPE_FIELDS (type);
1091 field = TREE_CHAIN (field))
1096 if (DECL_ARTIFICIAL (field))
1098 if (TREE_CODE (field) != FIELD_DECL)
1100 cp_pedwarn_at ("%q#D invalid; an anonymous union can only "
1101 "have non-static data members",
1106 if (TREE_PRIVATE (field))
1107 cp_pedwarn_at ("private member %q#D in anonymous union", field);
1108 else if (TREE_PROTECTED (field))
1109 cp_pedwarn_at ("protected member %q#D in anonymous union", field);
1111 if (processing_template_decl)
1112 ref = build_min_nt (COMPONENT_REF, object,
1113 DECL_NAME (field), NULL_TREE);
1115 ref = build_class_member_access_expr (object, field, NULL_TREE,
1118 if (DECL_NAME (field))
1120 decl = build_decl (ALIAS_DECL, DECL_NAME (field), TREE_TYPE (field));
1121 DECL_INITIAL (decl) = ref;
1122 TREE_PUBLIC (decl) = 0;
1123 TREE_STATIC (decl) = 0;
1124 DECL_EXTERNAL (decl) = 1;
1125 decl = pushdecl (decl);
1127 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1128 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1132 if (main_decl == NULL_TREE)
1139 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1140 anonymous union, then all members must be laid out together. PUBLIC_P
1141 is nonzero if this union is not declared static. */
1144 finish_anon_union (tree anon_union_decl)
1150 if (anon_union_decl == error_mark_node)
1153 type = TREE_TYPE (anon_union_decl);
1154 public_p = TREE_PUBLIC (anon_union_decl);
1156 /* The VAR_DECL's context is the same as the TYPE's context. */
1157 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1159 if (TYPE_FIELDS (type) == NULL_TREE)
1164 error ("namespace-scope anonymous aggregates must be static");
1168 main_decl = build_anon_union_vars (type, anon_union_decl);
1169 if (main_decl == NULL_TREE)
1171 warning ("anonymous union with no members");
1175 if (!processing_template_decl)
1177 /* Use main_decl to set the mangled name. */
1178 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1179 mangle_decl (anon_union_decl);
1180 DECL_NAME (anon_union_decl) = NULL_TREE;
1183 pushdecl (anon_union_decl);
1184 if (building_stmt_tree ()
1185 && at_function_scope_p ())
1186 add_decl_expr (anon_union_decl);
1187 else if (!processing_template_decl)
1188 rest_of_decl_compilation (anon_union_decl,
1189 toplevel_bindings_p (), at_eof);
1192 /* Auxiliary functions to make type signatures for
1193 `operator new' and `operator delete' correspond to
1194 what compiler will be expecting. */
1197 coerce_new_type (tree type)
1200 tree args = TYPE_ARG_TYPES (type);
1202 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1204 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1207 error ("%<operator new%> must return type %qT", ptr_type_node);
1210 if (!args || args == void_list_node
1211 || !same_type_p (TREE_VALUE (args), size_type_node))
1214 if (args && args != void_list_node)
1215 args = TREE_CHAIN (args);
1216 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1217 "as first parameter", size_type_node);
1222 args = tree_cons (NULL_TREE, size_type_node, args);
1225 type = build_exception_variant
1226 (build_function_type (ptr_type_node, args),
1227 TYPE_RAISES_EXCEPTIONS (type));
1235 coerce_delete_type (tree type)
1238 tree args = TYPE_ARG_TYPES (type);
1240 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1242 if (!same_type_p (TREE_TYPE (type), void_type_node))
1245 error ("%<operator delete%> must return type %qT", void_type_node);
1248 if (!args || args == void_list_node
1249 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1252 if (args && args != void_list_node)
1253 args = TREE_CHAIN (args);
1254 error ("%<operator delete%> takes type %qT as first parameter",
1260 args = tree_cons (NULL_TREE, ptr_type_node, args);
1263 type = build_exception_variant
1264 (build_function_type (void_type_node, args),
1265 TYPE_RAISES_EXCEPTIONS (type));
1274 mark_vtable_entries (tree decl)
1276 tree entries = CONSTRUCTOR_ELTS (DECL_INITIAL (decl));
1278 for (; entries; entries = TREE_CHAIN (entries))
1280 tree fnaddr = TREE_VALUE (entries);
1283 STRIP_NOPS (fnaddr);
1285 if (TREE_CODE (fnaddr) != ADDR_EXPR
1286 && TREE_CODE (fnaddr) != FDESC_EXPR)
1287 /* This entry is an offset: a virtual base class offset, a
1288 virtual call offset, an RTTI offset, etc. */
1291 fn = TREE_OPERAND (fnaddr, 0);
1292 TREE_ADDRESSABLE (fn) = 1;
1293 /* When we don't have vcall offsets, we output thunks whenever
1294 we output the vtables that contain them. With vcall offsets,
1295 we know all the thunks we'll need when we emit a virtual
1296 function, so we emit the thunks there instead. */
1297 if (DECL_THUNK_P (fn))
1298 use_thunk (fn, /*emit_p=*/0);
1303 /* Set DECL up to have the closest approximation of "initialized common"
1304 linkage available. */
1307 comdat_linkage (tree decl)
1310 make_decl_one_only (decl);
1311 else if (TREE_CODE (decl) == FUNCTION_DECL
1312 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1313 /* We can just emit function and compiler-generated variables
1314 statically; having multiple copies is (for the most part) only
1317 There are two correctness issues, however: the address of a
1318 template instantiation with external linkage should be the
1319 same, independent of what translation unit asks for the
1320 address, and this will not hold when we emit multiple copies of
1321 the function. However, there's little else we can do.
1323 Also, by default, the typeinfo implementation assumes that
1324 there will be only one copy of the string used as the name for
1325 each type. Therefore, if weak symbols are unavailable, the
1326 run-time library should perform a more conservative check; it
1327 should perform a string comparison, rather than an address
1329 TREE_PUBLIC (decl) = 0;
1332 /* Static data member template instantiations, however, cannot
1333 have multiple copies. */
1334 if (DECL_INITIAL (decl) == 0
1335 || DECL_INITIAL (decl) == error_mark_node)
1336 DECL_COMMON (decl) = 1;
1337 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1339 DECL_COMMON (decl) = 1;
1340 DECL_INITIAL (decl) = error_mark_node;
1342 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1344 /* We can't do anything useful; leave vars for explicit
1346 DECL_EXTERNAL (decl) = 1;
1347 DECL_NOT_REALLY_EXTERN (decl) = 0;
1351 if (DECL_LANG_SPECIFIC (decl))
1352 DECL_COMDAT (decl) = 1;
1355 /* For win32 we also want to put explicit instantiations in
1356 linkonce sections, so that they will be merged with implicit
1357 instantiations; otherwise we get duplicate symbol errors.
1358 For Darwin we do not want explicit instantiations to be
1362 maybe_make_one_only (tree decl)
1364 /* We used to say that this was not necessary on targets that support weak
1365 symbols, because the implicit instantiations will defer to the explicit
1366 one. However, that's not actually the case in SVR4; a strong definition
1367 after a weak one is an error. Also, not making explicit
1368 instantiations one_only means that we can end up with two copies of
1369 some template instantiations. */
1373 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1374 we can get away with not emitting them if they aren't used. We need
1375 to for variables so that cp_finish_decl will update their linkage,
1376 because their DECL_INITIAL may not have been set properly yet. */
1378 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1379 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1380 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1382 make_decl_one_only (decl);
1384 if (TREE_CODE (decl) == VAR_DECL)
1386 DECL_COMDAT (decl) = 1;
1387 /* Mark it needed so we don't forget to emit it. */
1388 mark_decl_referenced (decl);
1393 /* Determine whether or not we want to specifically import or export CTYPE,
1394 using various heuristics. */
1397 import_export_class (tree ctype)
1399 /* -1 for imported, 1 for exported. */
1400 int import_export = 0;
1402 /* It only makes sense to call this function at EOF. The reason is
1403 that this function looks at whether or not the first non-inline
1404 non-abstract virtual member function has been defined in this
1405 translation unit. But, we can't possibly know that until we've
1406 seen the entire translation unit. */
1407 gcc_assert (at_eof);
1409 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1412 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1413 we will have CLASSTYPE_INTERFACE_ONLY set but not
1414 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1415 heuristic because someone will supply a #pragma implementation
1416 elsewhere, and deducing it here would produce a conflict. */
1417 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1420 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1422 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1424 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1425 && !flag_implicit_templates)
1426 /* For a template class, without -fimplicit-templates, check the
1427 repository. If the virtual table is assigned to this
1428 translation unit, then export the class; otherwise, import
1430 import_export = repo_export_class_p (ctype) ? 1 : -1;
1431 else if (TYPE_POLYMORPHIC_P (ctype))
1433 /* The ABI specifies that the virtual table and associated
1434 information are emitted with the key method, if any. */
1435 tree method = CLASSTYPE_KEY_METHOD (ctype);
1436 /* If weak symbol support is not available, then we must be
1437 careful not to emit the vtable when the key function is
1438 inline. An inline function can be defined in multiple
1439 translation units. If we were to emit the vtable in each
1440 translation unit containing a definition, we would get
1441 multiple definition errors at link-time. */
1442 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1443 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1446 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1447 a definition anywhere else. */
1448 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1451 /* Allow backends the chance to overrule the decision. */
1452 if (targetm.cxx.import_export_class)
1453 import_export = targetm.cxx.import_export_class (ctype, import_export);
1457 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1458 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1462 /* Return true if VAR has already been provided to the back end; in that
1463 case VAR should not be modified further by the front end. */
1465 var_finalized_p (tree var)
1467 return cgraph_varpool_node (var)->finalized;
1470 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1471 must be emitted in this translation unit. Mark it as such. */
1474 mark_needed (tree decl)
1476 /* It's possible that we no longer need to set
1477 TREE_SYMBOL_REFERENCED here directly, but doing so is
1479 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1480 mark_decl_referenced (decl);
1483 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1484 returns true if a definition of this entity should be provided in
1485 this object file. Callers use this function to determine whether
1486 or not to let the back end know that a definition of DECL is
1487 available in this translation unit. */
1490 decl_needed_p (tree decl)
1492 gcc_assert (TREE_CODE (decl) == VAR_DECL
1493 || TREE_CODE (decl) == FUNCTION_DECL);
1494 /* This function should only be called at the end of the translation
1495 unit. We cannot be sure of whether or not something will be
1496 COMDAT until that point. */
1497 gcc_assert (at_eof);
1499 /* All entities with external linkage that are not COMDAT should be
1500 emitted; they may be referred to from other object files. */
1501 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1503 /* If this entity was used, let the back-end see it; it will decide
1504 whether or not to emit it into the object file. */
1505 if (TREE_USED (decl)
1506 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1507 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1509 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1510 reference to DECL might cause it to be emitted later. */
1514 /* If necessary, write out the vtables for the dynamic class CTYPE.
1515 Returns true if any vtables were emitted. */
1518 maybe_emit_vtables (tree ctype)
1524 /* If the vtables for this class have already been emitted there is
1525 nothing more to do. */
1526 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1527 if (var_finalized_p (primary_vtbl))
1529 /* Ignore dummy vtables made by get_vtable_decl. */
1530 if (TREE_TYPE (primary_vtbl) == void_type_node)
1533 /* On some targets, we cannot determine the key method until the end
1534 of the translation unit -- which is when this function is
1536 if (!targetm.cxx.key_method_may_be_inline ())
1537 determine_key_method (ctype);
1539 /* See if any of the vtables are needed. */
1540 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1542 import_export_decl (vtbl);
1543 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1548 /* If the references to this class' vtables are optimized away,
1549 still emit the appropriate debugging information. See
1551 if (DECL_COMDAT (primary_vtbl)
1552 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1553 note_debug_info_needed (ctype);
1557 /* The ABI requires that we emit all of the vtables if we emit any
1559 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1561 /* Mark entities references from the virtual table as used. */
1562 mark_vtable_entries (vtbl);
1564 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1566 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1568 /* It had better be all done at compile-time. */
1573 DECL_EXTERNAL (vtbl) = 0;
1574 rest_of_decl_compilation (vtbl, 1, 1);
1576 /* Because we're only doing syntax-checking, we'll never end up
1577 actually marking the variable as written. */
1578 if (flag_syntax_only)
1579 TREE_ASM_WRITTEN (vtbl) = 1;
1582 /* Since we're writing out the vtable here, also write the debug
1584 note_debug_info_needed (ctype);
1589 /* Like c_determine_visibility, but with additional C++-specific
1593 determine_visibility (tree decl)
1597 /* Cloned constructors and destructors get the same visibility as
1598 the underlying function. That should be set up in
1599 maybe_clone_body. */
1600 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1602 /* Give the common code a chance to make a determination. */
1603 if (c_determine_visibility (decl))
1606 /* If DECL is a member of a class, visibility specifiers on the
1607 class can influence the visibility of the DECL. */
1608 if (DECL_CLASS_SCOPE_P (decl))
1609 class_type = DECL_CONTEXT (decl);
1610 else if (TREE_CODE (decl) == VAR_DECL
1611 && DECL_TINFO_P (decl)
1612 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1613 class_type = TREE_TYPE (DECL_NAME (decl));
1616 /* Virtual tables have DECL_CONTEXT set to their associated class,
1617 so they are automatically handled above. */
1618 gcc_assert (TREE_CODE (decl) != VAR_DECL
1619 || !DECL_VTABLE_OR_VTT_P (decl));
1620 /* Entities not associated with any class just get the
1621 visibility specified by their attributes. */
1625 /* By default, static data members and function members receive
1626 the visibility of their containing class. */
1629 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1630 && lookup_attribute ("dllexport", TYPE_ATTRIBUTES (class_type)))
1632 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1633 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1635 else if (TREE_CODE (decl) == FUNCTION_DECL
1636 && DECL_DECLARED_INLINE_P (decl)
1637 && visibility_options.inlines_hidden)
1639 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1640 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1642 else if (CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1644 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1645 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1647 /* If no explicit visibility information has been provided for
1648 this class, some targets require that class data be
1650 else if (TREE_CODE (decl) == VAR_DECL
1651 && targetm.cxx.export_class_data ()
1652 && (DECL_TINFO_P (decl)
1653 || (DECL_VTABLE_OR_VTT_P (decl)
1654 /* Construction virtual tables are not emitted
1655 because they cannot be referred to from other
1656 object files; their name is not standardized by
1658 && !DECL_CONSTRUCTION_VTABLE_P (decl))))
1659 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1662 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1663 DECL_VISIBILITY_SPECIFIED (decl) = 0;
1668 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1669 for DECL has not already been determined, do so now by setting
1670 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1671 function is called entities with vague linkage whose definitions
1672 are available must have TREE_PUBLIC set.
1674 If this function decides to place DECL in COMDAT, it will set
1675 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1676 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1677 callers defer that decision until it is clear that DECL is actually
1681 import_export_decl (tree decl)
1687 if (DECL_INTERFACE_KNOWN (decl))
1690 /* We cannot determine what linkage to give to an entity with vague
1691 linkage until the end of the file. For example, a virtual table
1692 for a class will be defined if and only if the key method is
1693 defined in this translation unit. As a further example, consider
1694 that when compiling a translation unit that uses PCH file with
1695 "-frepo" it would be incorrect to make decisions about what
1696 entities to emit when building the PCH; those decisions must be
1697 delayed until the repository information has been processed. */
1698 gcc_assert (at_eof);
1699 /* Object file linkage for explicit instantiations is handled in
1700 mark_decl_instantiated. For static variables in functions with
1701 vague linkage, maybe_commonize_var is used.
1703 Therefore, the only declarations that should be provided to this
1704 function are those with external linkage that are:
1706 * implicit instantiations of function templates
1710 * implicit instantiations of static data members of class
1717 Furthermore, all entities that reach this point must have a
1718 definition available in this translation unit.
1720 The following assertions check these conditions. */
1721 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1722 || TREE_CODE (decl) == VAR_DECL);
1723 /* Any code that creates entities with TREE_PUBLIC cleared should
1724 also set DECL_INTERFACE_KNOWN. */
1725 gcc_assert (TREE_PUBLIC (decl));
1726 if (TREE_CODE (decl) == FUNCTION_DECL)
1727 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1728 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1729 || DECL_DECLARED_INLINE_P (decl));
1731 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1732 || DECL_VTABLE_OR_VTT_P (decl)
1733 || DECL_TINFO_P (decl));
1734 /* Check that a definition of DECL is available in this translation
1736 gcc_assert (!DECL_REALLY_EXTERN (decl));
1738 /* Assume that DECL will not have COMDAT linkage. */
1740 /* Assume that DECL will not be imported into this translation
1744 /* See if the repository tells us whether or not to emit DECL in
1745 this translation unit. */
1746 emit_p = repo_emit_p (decl);
1749 else if (emit_p == 1)
1751 /* The repository indicates that this entity should be defined
1752 here. Make sure the back end honors that request. */
1753 if (TREE_CODE (decl) == VAR_DECL)
1755 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1756 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1759 FOR_EACH_CLONE (clone, decl)
1760 mark_needed (clone);
1764 /* Output the definition as an ordinary strong definition. */
1765 DECL_EXTERNAL (decl) = 0;
1766 DECL_INTERFACE_KNOWN (decl) = 1;
1771 /* We have already decided what to do with this DECL; there is no
1772 need to check anything further. */
1774 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1776 tree type = DECL_CONTEXT (decl);
1777 import_export_class (type);
1778 if (TYPE_FOR_JAVA (type))
1780 else if (CLASSTYPE_INTERFACE_KNOWN (type)
1781 && CLASSTYPE_INTERFACE_ONLY (type))
1783 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1784 && !CLASSTYPE_USE_TEMPLATE (type)
1785 && CLASSTYPE_KEY_METHOD (type)
1786 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type)))
1787 /* The ABI requires that all virtual tables be emitted with
1788 COMDAT linkage. However, on systems where COMDAT symbols
1789 don't show up in the table of contents for a static
1790 archive, or on systems without weak symbols (where we
1791 approximate COMDAT linkage by using internal linkage), the
1792 linker will report errors about undefined symbols because
1793 it will not see the virtual table definition. Therefore,
1794 in the case that we know that the virtual table will be
1795 emitted in only one translation unit, we make the virtual
1796 table an ordinary definition with external linkage. */
1797 DECL_EXTERNAL (decl) = 0;
1798 else if (CLASSTYPE_INTERFACE_KNOWN (type))
1800 /* TYPE is being exported from this translation unit, so DECL
1801 should be defined here. */
1802 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (type))
1803 /* If a class is declared in a header with the "extern
1804 template" extension, then it will not be instantiated,
1805 even in translation units that would normally require
1806 it. Often such classes are explicitly instantiated in
1807 one translation unit. Therefore, the explicit
1808 instantiation must be made visible to other translation
1810 DECL_EXTERNAL (decl) = 0;
1813 /* The ABI requires COMDAT linkage. Normally, we only
1814 emit COMDAT things when they are needed; make sure
1815 that we realize that this entity is indeed
1821 else if (!flag_implicit_templates
1822 && CLASSTYPE_IMPLICIT_INSTANTIATION (type))
1827 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1829 tree type = TREE_TYPE (DECL_NAME (decl));
1830 if (CLASS_TYPE_P (type))
1832 import_export_class (type);
1833 if (CLASSTYPE_INTERFACE_KNOWN (type)
1834 && TYPE_POLYMORPHIC_P (type)
1835 && CLASSTYPE_INTERFACE_ONLY (type)
1836 /* If -fno-rtti was specified, then we cannot be sure
1837 that RTTI information will be emitted with the
1838 virtual table of the class, so we must emit it
1839 wherever it is used. */
1845 if (CLASSTYPE_INTERFACE_KNOWN (type)
1846 && !CLASSTYPE_INTERFACE_ONLY (type))
1852 DECL_EXTERNAL (decl) = 0;
1860 else if (DECL_TEMPLATE_INSTANTIATION (decl)
1861 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1863 /* DECL is an implicit instantiation of a function or static
1865 if (flag_implicit_templates
1866 || (flag_implicit_inline_templates
1867 && TREE_CODE (decl) == FUNCTION_DECL
1868 && DECL_DECLARED_INLINE_P (decl)))
1871 /* If we are not implicitly generating templates, then mark
1872 this entity as undefined in this translation unit. */
1875 else if (DECL_FUNCTION_MEMBER_P (decl))
1877 if (!DECL_DECLARED_INLINE_P (decl))
1879 tree ctype = DECL_CONTEXT (decl);
1880 import_export_class (ctype);
1881 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1883 DECL_NOT_REALLY_EXTERN (decl)
1884 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1885 || (DECL_DECLARED_INLINE_P (decl)
1886 && ! flag_implement_inlines
1887 && !DECL_VINDEX (decl)));
1889 if (!DECL_NOT_REALLY_EXTERN (decl))
1890 DECL_EXTERNAL (decl) = 1;
1892 /* Always make artificials weak. */
1893 if (DECL_ARTIFICIAL (decl) && flag_weak)
1896 maybe_make_one_only (decl);
1907 /* If we are importing DECL into this translation unit, mark is
1908 an undefined here. */
1909 DECL_EXTERNAL (decl) = 1;
1910 DECL_NOT_REALLY_EXTERN (decl) = 0;
1914 /* If we decided to put DECL in COMDAT, mark it accordingly at
1916 comdat_linkage (decl);
1919 DECL_INTERFACE_KNOWN (decl) = 1;
1922 /* Return an expression that performs the destruction of DECL, which
1923 must be a VAR_DECL whose type has a non-trivial destructor, or is
1924 an array whose (innermost) elements have a non-trivial destructor. */
1927 build_cleanup (tree decl)
1930 tree type = TREE_TYPE (decl);
1932 /* This function should only be called for declarations that really
1933 require cleanups. */
1934 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
1936 /* Treat all objects with destructors as used; the destructor may do
1937 something substantive. */
1940 if (TREE_CODE (type) == ARRAY_TYPE)
1944 cxx_mark_addressable (decl);
1945 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1947 temp = build_delete (TREE_TYPE (temp), temp,
1948 sfk_complete_destructor,
1949 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1953 /* Returns the initialization guard variable for the variable DECL,
1954 which has static storage duration. */
1957 get_guard (tree decl)
1962 sname = mangle_guard_variable (decl);
1963 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1968 /* We use a type that is big enough to contain a mutex as well
1969 as an integer counter. */
1970 guard_type = targetm.cxx.guard_type ();
1971 guard = build_decl (VAR_DECL, sname, guard_type);
1973 /* The guard should have the same linkage as what it guards. */
1974 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1975 TREE_STATIC (guard) = TREE_STATIC (decl);
1976 DECL_COMMON (guard) = DECL_COMMON (decl);
1977 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1978 if (TREE_PUBLIC (decl))
1979 DECL_WEAK (guard) = DECL_WEAK (decl);
1981 DECL_ARTIFICIAL (guard) = 1;
1982 DECL_IGNORED_P (guard) = 1;
1983 TREE_USED (guard) = 1;
1984 pushdecl_top_level_and_finish (guard, NULL_TREE);
1989 /* Return those bits of the GUARD variable that should be set when the
1990 guarded entity is actually initialized. */
1993 get_guard_bits (tree guard)
1995 if (!targetm.cxx.guard_mask_bit ())
1997 /* We only set the first byte of the guard, in order to leave room
1998 for a mutex in the high-order bits. */
1999 guard = build1 (ADDR_EXPR,
2000 build_pointer_type (TREE_TYPE (guard)),
2002 guard = build1 (NOP_EXPR,
2003 build_pointer_type (char_type_node),
2005 guard = build1 (INDIRECT_REF, char_type_node, guard);
2011 /* Return an expression which determines whether or not the GUARD
2012 variable has already been initialized. */
2015 get_guard_cond (tree guard)
2019 /* Check to see if the GUARD is zero. */
2020 guard = get_guard_bits (guard);
2022 /* Mask off all but the low bit. */
2023 if (targetm.cxx.guard_mask_bit ())
2025 guard_value = integer_one_node;
2026 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2027 guard_value = convert (TREE_TYPE (guard), guard_value);
2028 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2031 guard_value = integer_zero_node;
2032 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2033 guard_value = convert (TREE_TYPE (guard), guard_value);
2034 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2037 /* Return an expression which sets the GUARD variable, indicating that
2038 the variable being guarded has been initialized. */
2041 set_guard (tree guard)
2045 /* Set the GUARD to one. */
2046 guard = get_guard_bits (guard);
2047 guard_init = integer_one_node;
2048 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2049 guard_init = convert (TREE_TYPE (guard), guard_init);
2050 return build_modify_expr (guard, NOP_EXPR, guard_init);
2053 /* Start the process of running a particular set of global constructors
2054 or destructors. Subroutine of do_[cd]tors. */
2057 start_objects (int method_type, int initp)
2063 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2065 if (initp != DEFAULT_INIT_PRIORITY)
2075 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2078 sprintf (type, "%c", method_type);
2080 fndecl = build_lang_decl (FUNCTION_DECL,
2081 get_file_function_name_long (type),
2082 build_function_type (void_type_node,
2084 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2086 /* It can be a static function as long as collect2 does not have
2087 to scan the object file to find its ctor/dtor routine. */
2088 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2090 /* Mark this declaration as used to avoid spurious warnings. */
2091 TREE_USED (current_function_decl) = 1;
2093 /* Mark this function as a global constructor or destructor. */
2094 if (method_type == 'I')
2095 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2097 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2098 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2100 body = begin_compound_stmt (BCS_FN_BODY);
2102 /* We cannot allow these functions to be elided, even if they do not
2103 have external linkage. And, there's no point in deferring
2104 compilation of thes functions; they're all going to have to be
2106 DECL_INLINE (current_function_decl) = 0;
2107 DECL_UNINLINABLE (current_function_decl) = 1;
2112 /* Finish the process of running a particular set of global constructors
2113 or destructors. Subroutine of do_[cd]tors. */
2116 finish_objects (int method_type, int initp, tree body)
2121 finish_compound_stmt (body);
2122 fn = finish_function (0);
2123 expand_or_defer_fn (fn);
2125 /* When only doing semantic analysis, and no RTL generation, we
2126 can't call functions that directly emit assembly code; there is
2127 no assembly file in which to put the code. */
2128 if (flag_syntax_only)
2131 if (targetm.have_ctors_dtors)
2133 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2134 if (method_type == 'I')
2135 (* targetm.asm_out.constructor) (fnsym, initp);
2137 (* targetm.asm_out.destructor) (fnsym, initp);
2141 /* The names of the parameters to the function created to handle
2142 initializations and destructions for objects with static storage
2144 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2145 #define PRIORITY_IDENTIFIER "__priority"
2147 /* The name of the function we create to handle initializations and
2148 destructions for objects with static storage duration. */
2149 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2151 /* The declaration for the __INITIALIZE_P argument. */
2152 static GTY(()) tree initialize_p_decl;
2154 /* The declaration for the __PRIORITY argument. */
2155 static GTY(()) tree priority_decl;
2157 /* The declaration for the static storage duration function. */
2158 static GTY(()) tree ssdf_decl;
2160 /* All the static storage duration functions created in this
2161 translation unit. */
2162 static GTY(()) varray_type ssdf_decls;
2164 /* A map from priority levels to information about that priority
2165 level. There may be many such levels, so efficient lookup is
2167 static splay_tree priority_info_map;
2169 /* Begins the generation of the function that will handle all
2170 initialization and destruction of objects with static storage
2171 duration. The function generated takes two parameters of type
2172 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2173 nonzero, it performs initializations. Otherwise, it performs
2174 destructions. It only performs those initializations or
2175 destructions with the indicated __PRIORITY. The generated function
2178 It is assumed that this function will only be called once per
2179 translation unit. */
2182 start_static_storage_duration_function (unsigned count)
2187 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2189 /* Create the identifier for this function. It will be of the form
2190 SSDF_IDENTIFIER_<number>. */
2191 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2193 /* Create the parameters. */
2194 parm_types = void_list_node;
2195 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2196 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2197 type = build_function_type (void_type_node, parm_types);
2199 /* Create the FUNCTION_DECL itself. */
2200 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2201 get_identifier (id),
2203 TREE_PUBLIC (ssdf_decl) = 0;
2204 DECL_ARTIFICIAL (ssdf_decl) = 1;
2206 /* Put this function in the list of functions to be called from the
2207 static constructors and destructors. */
2210 VARRAY_TREE_INIT (ssdf_decls, 32, "ssdf_decls");
2212 /* Take this opportunity to initialize the map from priority
2213 numbers to information about that priority level. */
2214 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2215 /*delete_key_fn=*/0,
2216 /*delete_value_fn=*/
2217 (splay_tree_delete_value_fn) &free);
2219 /* We always need to generate functions for the
2220 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2221 priorities later, we'll be sure to find the
2222 DEFAULT_INIT_PRIORITY. */
2223 get_priority_info (DEFAULT_INIT_PRIORITY);
2226 VARRAY_PUSH_TREE (ssdf_decls, ssdf_decl);
2228 /* Create the argument list. */
2229 initialize_p_decl = cp_build_parm_decl
2230 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2231 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2232 TREE_USED (initialize_p_decl) = 1;
2233 priority_decl = cp_build_parm_decl
2234 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2235 DECL_CONTEXT (priority_decl) = ssdf_decl;
2236 TREE_USED (priority_decl) = 1;
2238 TREE_CHAIN (initialize_p_decl) = priority_decl;
2239 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2241 /* Put the function in the global scope. */
2242 pushdecl (ssdf_decl);
2244 /* Start the function itself. This is equivalent to declaring the
2247 static void __ssdf (int __initialize_p, init __priority_p);
2249 It is static because we only need to call this function from the
2250 various constructor and destructor functions for this module. */
2251 start_preparsed_function (ssdf_decl,
2252 /*attrs=*/NULL_TREE,
2255 /* Set up the scope of the outermost block in the function. */
2256 body = begin_compound_stmt (BCS_FN_BODY);
2258 /* This function must not be deferred because we are depending on
2259 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2260 DECL_INLINE (ssdf_decl) = 0;
2261 DECL_UNINLINABLE (ssdf_decl) = 1;
2266 /* Finish the generation of the function which performs initialization
2267 and destruction of objects with static storage duration. After
2268 this point, no more such objects can be created. */
2271 finish_static_storage_duration_function (tree body)
2273 /* Close out the function. */
2274 finish_compound_stmt (body);
2275 expand_or_defer_fn (finish_function (0));
2278 /* Return the information about the indicated PRIORITY level. If no
2279 code to handle this level has yet been generated, generate the
2280 appropriate prologue. */
2282 static priority_info
2283 get_priority_info (int priority)
2288 n = splay_tree_lookup (priority_info_map,
2289 (splay_tree_key) priority);
2292 /* Create a new priority information structure, and insert it
2294 pi = xmalloc (sizeof (struct priority_info_s));
2295 pi->initializations_p = 0;
2296 pi->destructions_p = 0;
2297 splay_tree_insert (priority_info_map,
2298 (splay_tree_key) priority,
2299 (splay_tree_value) pi);
2302 pi = (priority_info) n->value;
2307 /* Set up to handle the initialization or destruction of DECL. If
2308 INITP is nonzero, we are initializing the variable. Otherwise, we
2309 are destroying it. */
2312 start_static_initialization_or_destruction (tree decl, int initp)
2314 tree guard_if_stmt = NULL_TREE;
2321 /* Figure out the priority for this declaration. */
2322 priority = DECL_INIT_PRIORITY (decl);
2324 priority = DEFAULT_INIT_PRIORITY;
2326 /* Remember that we had an initialization or finalization at this
2328 pi = get_priority_info (priority);
2330 pi->initializations_p = 1;
2332 pi->destructions_p = 1;
2334 /* Trick the compiler into thinking we are at the file and line
2335 where DECL was declared so that error-messages make sense, and so
2336 that the debugger will show somewhat sensible file and line
2338 input_location = DECL_SOURCE_LOCATION (decl);
2344 Access control for implicit calls to the constructors,
2345 the conversion functions, or the destructor called to
2346 create and destroy a static data member is performed as
2347 if these calls appeared in the scope of the member's
2350 we pretend we are in a static member function of the class of
2351 which the DECL is a member. */
2352 if (member_p (decl))
2354 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2355 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2358 /* Conditionalize this initialization on being in the right priority
2359 and being initializing/finalizing appropriately. */
2360 guard_if_stmt = begin_if_stmt ();
2361 cond = cp_build_binary_op (EQ_EXPR,
2363 build_int_cst (NULL_TREE, priority));
2364 init_cond = initp ? integer_one_node : integer_zero_node;
2365 init_cond = cp_build_binary_op (EQ_EXPR,
2368 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, init_cond);
2370 /* Assume we don't need a guard. */
2372 /* We need a guard if this is an object with external linkage that
2373 might be initialized in more than one place. (For example, a
2374 static data member of a template, when the data member requires
2376 if (TREE_PUBLIC (decl) && (DECL_COMMON (decl)
2377 || DECL_ONE_ONLY (decl)
2378 || DECL_WEAK (decl)))
2382 guard = get_guard (decl);
2384 /* When using __cxa_atexit, we just check the GUARD as we would
2385 for a local static. */
2386 if (flag_use_cxa_atexit)
2388 /* When using __cxa_atexit, we never try to destroy
2389 anything from a static destructor. */
2391 guard_cond = get_guard_cond (guard);
2393 /* If we don't have __cxa_atexit, then we will be running
2394 destructors from .fini sections, or their equivalents. So,
2395 we need to know how many times we've tried to initialize this
2396 object. We do initializations only if the GUARD is zero,
2397 i.e., if we are the first to initialize the variable. We do
2398 destructions only if the GUARD is one, i.e., if we are the
2399 last to destroy the variable. */
2402 = cp_build_binary_op (EQ_EXPR,
2403 build_unary_op (PREINCREMENT_EXPR,
2409 = cp_build_binary_op (EQ_EXPR,
2410 build_unary_op (PREDECREMENT_EXPR,
2415 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, guard_cond);
2418 finish_if_stmt_cond (cond, guard_if_stmt);
2420 /* If we're using __cxa_atexit, we have not already set the GUARD,
2421 so we must do so now. */
2422 if (guard && initp && flag_use_cxa_atexit)
2423 finish_expr_stmt (set_guard (guard));
2425 return guard_if_stmt;
2428 /* We've just finished generating code to do an initialization or
2429 finalization. GUARD_IF_STMT is the if-statement we used to guard
2430 the initialization. */
2433 finish_static_initialization_or_destruction (tree guard_if_stmt)
2435 finish_then_clause (guard_if_stmt);
2436 finish_if_stmt (guard_if_stmt);
2438 /* Now that we're done with DECL we don't need to pretend to be a
2439 member of its class any longer. */
2440 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2441 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2444 /* Generate code to do the initialization of DECL, a VAR_DECL with
2445 static storage duration. The initialization is INIT. */
2448 do_static_initialization (tree decl, tree init)
2452 /* Set up for the initialization. */
2454 = start_static_initialization_or_destruction (decl,
2457 /* Perform the initialization. */
2459 finish_expr_stmt (init);
2461 /* If we're using __cxa_atexit, register a function that calls the
2462 destructor for the object. */
2463 if (flag_use_cxa_atexit)
2464 finish_expr_stmt (register_dtor_fn (decl));
2467 finish_static_initialization_or_destruction (guard_if_stmt);
2470 /* Generate code to do the static destruction of DECL. If DECL may be
2471 initialized more than once in different object files, GUARD is the
2472 guard variable to check. PRIORITY is the priority for the
2476 do_static_destruction (tree decl)
2480 /* If we're using __cxa_atexit, then destructors are registered
2481 immediately after objects are initialized. */
2482 gcc_assert (!flag_use_cxa_atexit);
2484 /* If we don't need a destructor, there's nothing to do. */
2485 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2488 /* Actually do the destruction. */
2489 guard_if_stmt = start_static_initialization_or_destruction (decl,
2491 finish_expr_stmt (build_cleanup (decl));
2492 finish_static_initialization_or_destruction (guard_if_stmt);
2495 /* VARS is a list of variables with static storage duration which may
2496 need initialization and/or finalization. Remove those variables
2497 that don't really need to be initialized or finalized, and return
2498 the resulting list. The order in which the variables appear in
2499 VARS is in reverse order of the order in which they should actually
2500 be initialized. The list we return is in the unreversed order;
2501 i.e., the first variable should be initialized first. */
2504 prune_vars_needing_no_initialization (tree *vars)
2507 tree result = NULL_TREE;
2512 tree decl = TREE_VALUE (t);
2513 tree init = TREE_PURPOSE (t);
2515 /* Deal gracefully with error. */
2516 if (decl == error_mark_node)
2518 var = &TREE_CHAIN (t);
2522 /* The only things that can be initialized are variables. */
2523 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2525 /* If this object is not defined, we don't need to do anything
2527 if (DECL_EXTERNAL (decl))
2529 var = &TREE_CHAIN (t);
2533 /* Also, if the initializer already contains errors, we can bail
2535 if (init && TREE_CODE (init) == TREE_LIST
2536 && value_member (error_mark_node, init))
2538 var = &TREE_CHAIN (t);
2542 /* This variable is going to need initialization and/or
2543 finalization, so we add it to the list. */
2544 *var = TREE_CHAIN (t);
2545 TREE_CHAIN (t) = result;
2552 /* Make sure we have told the back end about all the variables in
2556 write_out_vars (tree vars)
2560 for (v = vars; v; v = TREE_CHAIN (v))
2562 tree var = TREE_VALUE (v);
2563 if (!var_finalized_p (var))
2565 import_export_decl (var);
2566 rest_of_decl_compilation (var, 1, 1);
2571 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2572 (otherwise) that will initialize all gobal objects with static
2573 storage duration having the indicated PRIORITY. */
2576 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2585 input_location = *locus;
2586 #ifdef USE_MAPPED_LOCATION
2592 /* We use `I' to indicate initialization and `D' to indicate
2594 function_key = constructor_p ? 'I' : 'D';
2596 /* We emit the function lazily, to avoid generating empty
2597 global constructors and destructors. */
2600 /* Call the static storage duration function with appropriate
2603 for (i = 0; i < ssdf_decls->elements_used; ++i)
2605 fndecl = VARRAY_TREE (ssdf_decls, i);
2607 /* Calls to pure or const functions will expand to nothing. */
2608 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2611 body = start_objects (function_key, priority);
2613 arguments = tree_cons (NULL_TREE,
2614 build_int_cst (NULL_TREE, priority),
2616 arguments = tree_cons (NULL_TREE,
2617 build_int_cst (NULL_TREE, constructor_p),
2619 finish_expr_stmt (build_function_call (fndecl, arguments));
2623 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2624 calls to any functions marked with attributes indicating that
2625 they should be called at initialization- or destruction-time. */
2626 if (priority == DEFAULT_INIT_PRIORITY)
2630 for (fns = constructor_p ? static_ctors : static_dtors;
2632 fns = TREE_CHAIN (fns))
2634 fndecl = TREE_VALUE (fns);
2636 /* Calls to pure/const functions will expand to nothing. */
2637 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2640 body = start_objects (function_key, priority);
2641 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2646 /* Close out the function. */
2648 finish_objects (function_key, priority, body);
2651 /* Generate constructor and destructor functions for the priority
2655 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2657 location_t *locus = data;
2658 int priority = (int) n->key;
2659 priority_info pi = (priority_info) n->value;
2661 /* Generate the functions themselves, but only if they are really
2663 if (pi->initializations_p
2664 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2665 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2666 if (pi->destructions_p
2667 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2668 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2670 /* Keep iterating. */
2674 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2675 decls referenced from frontend specific constructs; it will be called
2676 only for language-specific tree nodes.
2678 Here we must deal with member pointers. */
2681 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2682 tree from ATTRIBUTE_UNUSED)
2686 switch (TREE_CODE (t))
2689 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2690 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2693 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2694 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2697 if (DECL_VTABLE_OR_VTT_P (t))
2699 /* The ABI requires that all virtual tables be emitted
2700 whenever one of them is. */
2702 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2704 vtbl = TREE_CHAIN (vtbl))
2705 mark_decl_referenced (vtbl);
2707 else if (DECL_CONTEXT (t)
2708 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2709 /* If we need a static variable in a function, then we
2710 need the containing function. */
2711 mark_decl_referenced (DECL_CONTEXT (t));
2720 /* This routine is called from the last rule in yyparse ().
2721 Its job is to create all the code needed to initialize and
2722 destroy the global aggregates. We do the destruction
2723 first, since that way we only need to reverse the decls once. */
2726 cp_finish_file (void)
2732 unsigned ssdf_count = 0;
2735 locus = input_location;
2738 /* Bad parse errors. Just forget about it. */
2739 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2743 c_common_write_pch ();
2745 #ifdef USE_MAPPED_LOCATION
2748 /* Otherwise, GDB can get confused, because in only knows
2749 about source for LINENO-1 lines. */
2753 /* We now have to write out all the stuff we put off writing out.
2756 o Template specializations that we have not yet instantiated,
2757 but which are needed.
2758 o Initialization and destruction for non-local objects with
2759 static storage duration. (Local objects with static storage
2760 duration are initialized when their scope is first entered,
2761 and are cleaned up via atexit.)
2762 o Virtual function tables.
2764 All of these may cause others to be needed. For example,
2765 instantiating one function may cause another to be needed, and
2766 generating the initializer for an object may cause templates to be
2767 instantiated, etc., etc. */
2769 timevar_push (TV_VARCONST);
2771 emit_support_tinfos ();
2779 /* If there are templates that we've put off instantiating, do
2781 instantiate_pending_templates (retries);
2784 /* Write out virtual tables as required. Note that writing out
2785 the virtual table for a template class may cause the
2786 instantiation of members of that class. If we write out
2787 vtables then we remove the class from our list so we don't
2788 have to look at it again. */
2790 while (keyed_classes != NULL_TREE
2791 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2794 keyed_classes = TREE_CHAIN (keyed_classes);
2800 tree next = TREE_CHAIN (t);
2804 if (maybe_emit_vtables (TREE_VALUE (next)))
2807 TREE_CHAIN (t) = TREE_CHAIN (next);
2812 next = TREE_CHAIN (t);
2816 /* Write out needed type info variables. We have to be careful
2817 looping through unemitted decls, because emit_tinfo_decl may
2818 cause other variables to be needed. New elements will be
2819 appended, and we remove from the vector those that actually
2821 for (i = VEC_length (tree, unemitted_tinfo_decls);
2822 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
2823 if (emit_tinfo_decl (t))
2826 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
2829 /* The list of objects with static storage duration is built up
2830 in reverse order. We clear STATIC_AGGREGATES so that any new
2831 aggregates added during the initialization of these will be
2832 initialized in the correct order when we next come around the
2834 vars = prune_vars_needing_no_initialization (&static_aggregates);
2840 /* We need to start a new initialization function each time
2841 through the loop. That's because we need to know which
2842 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2843 isn't computed until a function is finished, and written
2844 out. That's a deficiency in the back-end. When this is
2845 fixed, these initialization functions could all become
2846 inline, with resulting performance improvements. */
2849 /* Set the line and file, so that it is obviously not from
2851 input_location = locus;
2852 ssdf_body = start_static_storage_duration_function (ssdf_count);
2854 /* Make sure the back end knows about all the variables. */
2855 write_out_vars (vars);
2857 /* First generate code to do all the initializations. */
2858 for (v = vars; v; v = TREE_CHAIN (v))
2859 do_static_initialization (TREE_VALUE (v),
2862 /* Then, generate code to do all the destructions. Do these
2863 in reverse order so that the most recently constructed
2864 variable is the first destroyed. If we're using
2865 __cxa_atexit, then we don't need to do this; functions
2866 were registered at initialization time to destroy the
2868 if (!flag_use_cxa_atexit)
2870 vars = nreverse (vars);
2871 for (v = vars; v; v = TREE_CHAIN (v))
2872 do_static_destruction (TREE_VALUE (v));
2877 /* Finish up the static storage duration function for this
2879 input_location = locus;
2880 finish_static_storage_duration_function (ssdf_body);
2882 /* All those initializations and finalizations might cause
2883 us to need more inline functions, more template
2884 instantiations, etc. */
2887 #ifdef USE_MAPPED_LOCATION
2894 /* Go through the set of inline functions whose bodies have not
2895 been emitted yet. If out-of-line copies of these functions
2896 are required, emit them. */
2897 for (i = 0; i < deferred_fns_used; ++i)
2899 tree decl = VARRAY_TREE (deferred_fns, i);
2901 /* Does it need synthesizing? */
2902 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2903 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2905 /* Even though we're already at the top-level, we push
2906 there again. That way, when we pop back a few lines
2907 hence, all of our state is restored. Otherwise,
2908 finish_function doesn't clean things up, and we end
2909 up with CURRENT_FUNCTION_DECL set. */
2910 push_to_top_level ();
2911 synthesize_method (decl);
2912 pop_from_top_level ();
2916 if (!DECL_SAVED_TREE (decl))
2919 import_export_decl (decl);
2921 /* We lie to the back-end, pretending that some functions
2922 are not defined when they really are. This keeps these
2923 functions from being put out unnecessarily. But, we must
2924 stop lying when the functions are referenced, or if they
2925 are not comdat since they need to be put out now. This
2926 is done in a separate for cycle, because if some deferred
2927 function is contained in another deferred function later
2928 in deferred_fns varray, rest_of_compilation would skip
2929 this function and we really cannot expand the same
2931 if (DECL_NOT_REALLY_EXTERN (decl)
2932 && DECL_INITIAL (decl)
2933 && decl_needed_p (decl))
2934 DECL_EXTERNAL (decl) = 0;
2936 /* If we're going to need to write this function out, and
2937 there's already a body for it, create RTL for it now.
2938 (There might be no body if this is a method we haven't
2939 gotten around to synthesizing yet.) */
2940 if (!DECL_EXTERNAL (decl)
2941 && decl_needed_p (decl)
2942 && !TREE_ASM_WRITTEN (decl)
2943 && !cgraph_node (decl)->local.finalized)
2945 /* We will output the function; no longer consider it in this
2947 DECL_DEFER_OUTPUT (decl) = 0;
2948 /* Generate RTL for this function now that we know we
2950 expand_or_defer_fn (decl);
2951 /* If we're compiling -fsyntax-only pretend that this
2952 function has been written out so that we don't try to
2954 if (flag_syntax_only)
2955 TREE_ASM_WRITTEN (decl) = 1;
2960 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
2963 /* Static data members are just like namespace-scope globals. */
2964 for (i = 0; i < pending_statics_used; ++i)
2966 tree decl = VARRAY_TREE (pending_statics, 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;
2976 && wrapup_global_declarations (&VARRAY_TREE (pending_statics, 0),
2977 pending_statics_used))
2980 /* Ask the back end to emit functions and variables that are
2981 enqueued. These emissions may result in marking more entities
2983 if (cgraph_assemble_pending_functions ())
2985 if (cgraph_varpool_assemble_pending_decls ())
2992 /* All used inline functions must have a definition at this point. */
2993 for (i = 0; i < deferred_fns_used; ++i)
2995 tree decl = VARRAY_TREE (deferred_fns, i);
2997 if (/* Check online inline functions that were actually used. */
2998 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
2999 /* But not defined. */
3000 && DECL_REALLY_EXTERN (decl)
3001 /* If we decided to emit this function in another
3002 translation unit, the fact that the definition was
3003 missing here likely indicates only that the repository
3004 decided to place the function elsewhere. With -Winline,
3005 we will still warn if we could not inline the
3007 && !flag_use_repository
3008 /* An explicit instantiation can be used to specify
3009 that the body is in another unit. It will have
3010 already verified there was a definition. */
3011 && !DECL_EXPLICIT_INSTANTIATION (decl))
3013 cp_warning_at ("inline function %qD used but never defined", decl);
3014 /* This symbol is effectively an "extern" declaration now.
3015 This is not strictly necessary, but removes a duplicate
3017 TREE_PUBLIC (decl) = 1;
3021 /* We give C linkage to static constructors and destructors. */
3022 push_lang_context (lang_name_c);
3024 /* Generate initialization and destruction functions for all
3025 priorities for which they are required. */
3026 if (priority_info_map)
3027 splay_tree_foreach (priority_info_map,
3028 generate_ctor_and_dtor_functions_for_priority,
3034 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3035 DEFAULT_INIT_PRIORITY, &locus);
3037 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3038 DEFAULT_INIT_PRIORITY, &locus);
3041 /* We're done with the splay-tree now. */
3042 if (priority_info_map)
3043 splay_tree_delete (priority_info_map);
3045 /* Generate any missing aliases. */
3046 maybe_apply_pending_pragma_weaks ();
3048 /* We're done with static constructors, so we can go back to "C++"
3050 pop_lang_context ();
3052 cgraph_finalize_compilation_unit ();
3055 /* Now, issue warnings about static, but not defined, functions,
3056 etc., and emit debugging information. */
3057 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3058 if (pending_statics)
3059 check_global_declarations (&VARRAY_TREE (pending_statics, 0),
3060 pending_statics_used);
3064 /* The entire file is now complete. If requested, dump everything
3068 FILE *stream = dump_begin (TDI_tu, &flags);
3072 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3073 dump_end (TDI_tu, stream);
3077 timevar_pop (TV_VARCONST);
3079 if (flag_detailed_statistics)
3081 dump_tree_statistics ();
3082 dump_time_statistics ();
3084 input_location = locus;
3086 #ifdef ENABLE_CHECKING
3087 validate_conversion_obstack ();
3088 #endif /* ENABLE_CHECKING */
3091 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3092 function to call in parse-tree form; it has not yet been
3093 semantically analyzed. ARGS are the arguments to the function.
3094 They have already been semantically analyzed. */
3097 build_offset_ref_call_from_tree (tree fn, tree args)
3106 object = TREE_OPERAND (fn, 0);
3108 if (processing_template_decl)
3110 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3111 || TREE_CODE (fn) == MEMBER_REF);
3112 if (type_dependent_expression_p (fn)
3113 || any_type_dependent_arguments_p (args))
3114 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3116 /* Transform the arguments and add the implicit "this"
3117 parameter. That must be done before the FN is transformed
3118 because we depend on the form of FN. */
3119 args = build_non_dependent_args (args);
3120 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3121 object = build_unary_op (ADDR_EXPR, object, 0);
3122 object = build_non_dependent_expr (object);
3123 args = tree_cons (NULL_TREE, object, args);
3124 /* Now that the arguments are done, transform FN. */
3125 fn = build_non_dependent_expr (fn);
3128 /* A qualified name corresponding to a bound pointer-to-member is
3129 represented as an OFFSET_REF:
3131 struct B { void g(); };
3133 void B::g() { (this->*p)(); } */
3134 if (TREE_CODE (fn) == OFFSET_REF)
3136 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3137 fn = TREE_OPERAND (fn, 1);
3138 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3139 args = tree_cons (NULL_TREE, object_addr, args);
3142 expr = build_function_call (fn, args);
3143 if (processing_template_decl && expr != error_mark_node)
3144 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3150 check_default_args (tree x)
3152 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3153 bool saw_def = false;
3154 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3155 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3157 if (TREE_PURPOSE (arg))
3161 cp_error_at ("default argument missing for parameter %P of %q+#D",
3169 mark_used (tree decl)
3171 TREE_USED (decl) = 1;
3172 if (processing_template_decl || skip_evaluation)
3175 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3176 && !TREE_ASM_WRITTEN (decl))
3177 /* Remember it, so we can check it was defined. */
3179 if (DECL_DEFERRED_FN (decl))
3181 note_vague_linkage_fn (decl);
3184 assemble_external (decl);
3186 /* Is it a synthesized method that needs to be synthesized? */
3187 if (TREE_CODE (decl) == FUNCTION_DECL
3188 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3189 && DECL_ARTIFICIAL (decl)
3190 && !DECL_THUNK_P (decl)
3191 && ! DECL_INITIAL (decl)
3192 /* Kludge: don't synthesize for default args. Unfortunately this
3193 rules out initializers of namespace-scoped objects too, but
3194 it's sort-of ok if the implicit ctor or dtor decl keeps
3195 pointing to the class location. */
3196 && current_function_decl)
3198 /* Put the function definition at the position where it is needed,
3199 rather than within the body of the class. That way, an error
3200 during the generation of the implicit body points at the place
3201 where the attempt to generate the function occurs, giving the
3202 user a hint as to why we are attempting to generate the
3204 DECL_SOURCE_LOCATION (decl) = input_location;
3206 synthesize_method (decl);
3207 /* If we've already synthesized the method we don't need to
3208 instantiate it, so we can return right away. */
3212 /* If this is a function or variable that is an instance of some
3213 template, we now know that we will need to actually do the
3214 instantiation. We check that DECL is not an explicit
3215 instantiation because that is not checked in instantiate_decl. */
3216 if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3217 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3218 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3219 || (TREE_CODE (decl) == FUNCTION_DECL
3220 && DECL_INLINE (DECL_TEMPLATE_RESULT
3221 (template_for_substitution (decl))))))
3222 /* We put off instantiating functions in order to improve compile
3223 times. Maintaining a stack of active functions is expensive,
3224 and the inliner knows to instantiate any functions it might
3226 instantiate_decl (decl, /*defer_ok=*/true, /*undefined_ok=*/0);
3229 #include "gt-cp-decl2.h"