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, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, 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"
52 #include "tree-dump.h"
55 extern cpp_reader *parse_in;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s {
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree);
69 static bool maybe_emit_vtables (tree);
70 static bool acceptable_java_type (tree);
71 static tree start_objects (int, int);
72 static void finish_objects (int, int, tree);
73 static tree start_static_storage_duration_function (unsigned);
74 static void finish_static_storage_duration_function (tree);
75 static priority_info get_priority_info (int);
76 static void do_static_initialization_or_destruction (tree, bool);
77 static void one_static_initialization_or_destruction (tree, tree, bool);
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);
85 static void determine_visibility_from_class (tree, tree);
87 /* A list of static class variables. This is needed, because a
88 static class variable can be declared inside the class without
89 an initializer, and then initialized, statically, outside the class. */
90 static GTY(()) VEC(tree,gc) *pending_statics;
92 /* A list of functions which were declared inline, but which we
93 may need to emit outline anyway. */
94 static GTY(()) VEC(tree,gc) *deferred_fns;
96 /* Nonzero if we're done parsing and into end-of-file activities. */
102 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
103 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
104 that apply to the function). */
107 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
112 if (fntype == error_mark_node || ctype == error_mark_node)
113 return error_mark_node;
115 type_quals = quals & ~TYPE_QUAL_RESTRICT;
116 ctype = cp_build_qualified_type (ctype, type_quals);
117 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
118 (TREE_CODE (fntype) == METHOD_TYPE
119 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
120 : TYPE_ARG_TYPES (fntype)));
121 raises = TYPE_RAISES_EXCEPTIONS (fntype);
123 fntype = build_exception_variant (fntype, raises);
128 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
132 cp_build_parm_decl (tree name, tree type)
134 tree parm = build_decl (PARM_DECL, name, type);
135 /* DECL_ARG_TYPE is only used by the back end and the back end never
137 if (!processing_template_decl)
138 DECL_ARG_TYPE (parm) = type_passed_as (type);
140 /* If the type is a pack expansion, then we have a function
142 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
143 FUNCTION_PARAMETER_PACK_P (parm) = 1;
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)
261 tree fn_name = DECL_NAME (function);
263 /* Even within an `extern "C"' block, members get C++ linkage. See
264 [dcl.link] for details. */
265 SET_DECL_LANGUAGE (function, lang_cplusplus);
267 if (fn_name == NULL_TREE)
269 error ("name missing for member function");
270 fn_name = get_identifier ("<anonymous>");
271 DECL_NAME (function) = fn_name;
274 DECL_CONTEXT (function) = ctype;
276 if (flags == DTOR_FLAG)
277 DECL_DESTRUCTOR_P (function) = 1;
279 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
280 maybe_retrofit_in_chrg (function);
283 /* Create an ARRAY_REF, checking for the user doing things backwards
287 grok_array_decl (tree array_expr, tree index_exp)
291 tree orig_array_expr = array_expr;
292 tree orig_index_exp = index_exp;
294 if (error_operand_p (array_expr) || error_operand_p (index_exp))
295 return error_mark_node;
297 if (processing_template_decl)
299 if (type_dependent_expression_p (array_expr)
300 || type_dependent_expression_p (index_exp))
301 return build_min_nt (ARRAY_REF, array_expr, index_exp,
302 NULL_TREE, NULL_TREE);
303 array_expr = build_non_dependent_expr (array_expr);
304 index_exp = build_non_dependent_expr (index_exp);
307 type = TREE_TYPE (array_expr);
309 type = non_reference (type);
311 /* If they have an `operator[]', use that. */
312 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
313 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
314 array_expr, index_exp, NULL_TREE,
315 /*overloaded_p=*/NULL);
320 /* Otherwise, create an ARRAY_REF for a pointer or array type.
321 It is a little-known fact that, if `a' is an array and `i' is
322 an int, you can write `i[a]', which means the same thing as
324 if (TREE_CODE (type) == ARRAY_TYPE)
327 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
329 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
332 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
334 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
336 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
339 if ((p1 && i2) && (i1 && p2))
340 error ("ambiguous conversion for array subscript");
343 array_expr = p1, index_exp = i2;
345 array_expr = p2, index_exp = i1;
348 error ("invalid types %<%T[%T]%> for array subscript",
349 type, TREE_TYPE (index_exp));
350 return error_mark_node;
353 if (array_expr == error_mark_node || index_exp == error_mark_node)
354 error ("ambiguous conversion for array subscript");
356 expr = build_array_ref (array_expr, index_exp);
358 if (processing_template_decl && expr != error_mark_node)
359 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
360 NULL_TREE, NULL_TREE);
364 /* Given the cast expression EXP, checking out its validity. Either return
365 an error_mark_node if there was an unavoidable error, return a cast to
366 void for trying to delete a pointer w/ the value 0, or return the
367 call to delete. If DOING_VEC is true, we handle things differently
368 for doing an array delete.
369 Implements ARM $5.3.4. This is called from the parser. */
372 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
376 if (exp == error_mark_node)
379 if (processing_template_decl)
381 t = build_min (DELETE_EXPR, void_type_node, exp, size);
382 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
383 DELETE_EXPR_USE_VEC (t) = doing_vec;
384 TREE_SIDE_EFFECTS (t) = 1;
388 /* An array can't have been allocated by new, so complain. */
389 if (TREE_CODE (exp) == VAR_DECL
390 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
391 warning (0, "deleting array %q#D", exp);
393 t = build_expr_type_conversion (WANT_POINTER, exp, true);
395 if (t == NULL_TREE || t == error_mark_node)
397 error ("type %q#T argument given to %<delete%>, expected pointer",
399 return error_mark_node;
402 type = TREE_TYPE (t);
404 /* As of Valley Forge, you can delete a pointer to const. */
406 /* You can't delete functions. */
407 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
409 error ("cannot delete a function. Only pointer-to-objects are "
410 "valid arguments to %<delete%>");
411 return error_mark_node;
414 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
415 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
417 warning (0, "deleting %qT is undefined", type);
421 /* Deleting a pointer with the value zero is valid and has no effect. */
422 if (integer_zerop (t))
423 return build1 (NOP_EXPR, void_type_node, t);
426 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
427 sfk_deleting_destructor,
430 return build_delete (type, t, sfk_deleting_destructor,
431 LOOKUP_NORMAL, use_global_delete);
434 /* Report an error if the indicated template declaration is not the
435 sort of thing that should be a member template. */
438 check_member_template (tree tmpl)
442 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
443 decl = DECL_TEMPLATE_RESULT (tmpl);
445 if (TREE_CODE (decl) == FUNCTION_DECL
446 || (TREE_CODE (decl) == TYPE_DECL
447 && IS_AGGR_TYPE (TREE_TYPE (decl))))
449 /* The parser rejects template declarations in local classes. */
450 gcc_assert (!current_function_decl);
451 /* The parser rejects any use of virtual in a function template. */
452 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
453 && DECL_VIRTUAL_P (decl)));
455 /* The debug-information generating code doesn't know what to do
456 with member templates. */
457 DECL_IGNORED_P (tmpl) = 1;
460 error ("template declaration of %q#D", decl);
463 /* Return true iff TYPE is a valid Java parameter or return type. */
466 acceptable_java_type (tree type)
468 if (type == error_mark_node)
471 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
473 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
475 type = TREE_TYPE (type);
476 if (TREE_CODE (type) == RECORD_TYPE)
479 if (! TYPE_FOR_JAVA (type))
481 if (! CLASSTYPE_TEMPLATE_INFO (type))
483 args = CLASSTYPE_TI_ARGS (type);
484 i = TREE_VEC_LENGTH (args);
487 type = TREE_VEC_ELT (args, i);
488 if (TREE_CODE (type) == POINTER_TYPE)
489 type = TREE_TYPE (type);
490 if (! TYPE_FOR_JAVA (type))
499 /* For a METHOD in a Java class CTYPE, return true if
500 the parameter and return types are valid Java types.
501 Otherwise, print appropriate error messages, and return false. */
504 check_java_method (tree method)
507 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
508 tree ret_type = TREE_TYPE (TREE_TYPE (method));
510 if (!acceptable_java_type (ret_type))
512 error ("Java method %qD has non-Java return type %qT",
517 arg_types = TREE_CHAIN (arg_types);
518 if (DECL_HAS_IN_CHARGE_PARM_P (method))
519 arg_types = TREE_CHAIN (arg_types);
520 if (DECL_HAS_VTT_PARM_P (method))
521 arg_types = TREE_CHAIN (arg_types);
523 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
525 tree type = TREE_VALUE (arg_types);
526 if (!acceptable_java_type (type))
528 if (type != error_mark_node)
529 error ("Java method %qD has non-Java parameter type %qT",
537 /* Sanity check: report error if this function FUNCTION is not
538 really a member of the class (CTYPE) it is supposed to belong to.
539 TEMPLATE_PARMS is used to specify the template parameters of a member
540 template passed as FUNCTION_DECL. If the member template is passed as a
541 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
542 from the declaration. If the function is not a function template, it
544 It returns the original declaration for the function, or NULL_TREE
545 if no declaration was found (and an error was emitted). */
548 check_classfn (tree ctype, tree function, tree template_parms)
554 if (DECL_USE_TEMPLATE (function)
555 && !(TREE_CODE (function) == TEMPLATE_DECL
556 && DECL_TEMPLATE_SPECIALIZATION (function))
557 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
558 /* Since this is a specialization of a member template,
559 we're not going to find the declaration in the class.
562 struct S { template <typename T> void f(T); };
563 template <> void S::f(int);
565 we're not going to find `S::f(int)', but there's no
566 reason we should, either. We let our callers know we didn't
567 find the method, but we don't complain. */
570 /* Basic sanity check: for a template function, the template parameters
571 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
572 if (TREE_CODE (function) == TEMPLATE_DECL)
574 gcc_assert (!template_parms
575 || comp_template_parms (template_parms,
576 DECL_TEMPLATE_PARMS (function)));
577 template_parms = DECL_TEMPLATE_PARMS (function);
580 /* OK, is this a definition of a member template? */
581 is_template = (template_parms != NULL_TREE);
583 /* We must enter the scope here, because conversion operators are
584 named by target type, and type equivalence relies on typenames
585 resolving within the scope of CTYPE. */
586 pushed_scope = push_scope (ctype);
587 ix = class_method_index_for_fn (complete_type (ctype), function);
590 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
591 tree fndecls, fndecl = 0;
593 const char *format = NULL;
595 for (fndecls = VEC_index (tree, methods, ix);
596 fndecls; fndecls = OVL_NEXT (fndecls))
600 fndecl = OVL_CURRENT (fndecls);
601 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
602 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
604 /* We cannot simply call decls_match because this doesn't
605 work for static member functions that are pretending to
606 be methods, and because the name may have been changed by
609 /* Get rid of the this parameter on functions that become
611 if (DECL_STATIC_FUNCTION_P (fndecl)
612 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
613 p1 = TREE_CHAIN (p1);
615 /* A member template definition only matches a member template
617 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
620 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
621 TREE_TYPE (TREE_TYPE (fndecl)))
622 && compparms (p1, p2)
624 || comp_template_parms (template_parms,
625 DECL_TEMPLATE_PARMS (fndecl)))
626 && (DECL_TEMPLATE_SPECIALIZATION (function)
627 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
628 && (!DECL_TEMPLATE_SPECIALIZATION (function)
629 || (DECL_TI_TEMPLATE (function)
630 == DECL_TI_TEMPLATE (fndecl))))
636 pop_scope (pushed_scope);
637 return OVL_CURRENT (fndecls);
640 error ("prototype for %q#D does not match any in class %qT",
642 is_conv_op = DECL_CONV_FN_P (fndecl);
645 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
646 fndecls = VEC_index (tree, methods, ix);
649 fndecl = OVL_CURRENT (fndecls);
650 fndecls = OVL_NEXT (fndecls);
652 if (!fndecls && is_conv_op)
654 if (VEC_length (tree, methods) > (size_t) ++ix)
656 fndecls = VEC_index (tree, methods, ix);
657 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
669 format = N_("candidates are: %+#D");
671 format = N_("candidate is: %+#D");
672 error (format, fndecl);
675 else if (!COMPLETE_TYPE_P (ctype))
676 cxx_incomplete_type_error (function, ctype);
678 error ("no %q#D member function declared in class %qT",
681 /* If we did not find the method in the class, add it to avoid
682 spurious errors (unless the CTYPE is not yet defined, in which
683 case we'll only confuse ourselves when the function is declared
684 properly within the class. */
685 if (COMPLETE_TYPE_P (ctype))
686 add_method (ctype, function, NULL_TREE);
689 pop_scope (pushed_scope);
693 /* DECL is a function with vague linkage. Remember it so that at the
694 end of the translation unit we can decide whether or not to emit
698 note_vague_linkage_fn (tree decl)
700 if (!DECL_DEFERRED_FN (decl))
702 DECL_DEFERRED_FN (decl) = 1;
703 DECL_DEFER_OUTPUT (decl) = 1;
704 VEC_safe_push (tree, gc, deferred_fns, decl);
708 /* We have just processed the DECL, which is a static data member.
709 The other parameters are as for cp_finish_decl. */
712 finish_static_data_member_decl (tree decl,
713 tree init, bool init_const_expr_p,
717 DECL_CONTEXT (decl) = current_class_type;
719 /* We cannot call pushdecl here, because that would fill in the
720 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
721 the right thing, namely, to put this decl out straight away. */
723 if (! processing_template_decl)
724 VEC_safe_push (tree, gc, pending_statics, decl);
726 if (LOCAL_CLASS_P (current_class_type))
727 pedwarn ("local class %q#T shall not have static data member %q#D",
728 current_class_type, decl);
730 /* Static consts need not be initialized in the class definition. */
731 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
733 static int explained = 0;
735 error ("initializer invalid for static member with constructor");
738 error ("(an out of class initialization is required)");
743 /* Force the compiler to know when an uninitialized static const
744 member is being used. */
745 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
746 TREE_USED (decl) = 1;
747 DECL_INITIAL (decl) = init;
748 DECL_IN_AGGR_P (decl) = 1;
750 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
753 /* DECLARATOR and DECLSPECS correspond to a class member. The other
754 parameters are as for cp_finish_decl. Return the DECL for the
755 class member declared. */
758 grokfield (const cp_declarator *declarator,
759 cp_decl_specifier_seq *declspecs,
760 tree init, bool init_const_expr_p,
765 const char *asmspec = 0;
766 int flags = LOOKUP_ONLYCONVERTING;
769 && TREE_CODE (init) == TREE_LIST
770 && TREE_VALUE (init) == error_mark_node
771 && TREE_CHAIN (init) == NULL_TREE)
774 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
775 if (! value || error_operand_p (value))
776 /* friend or constructor went bad. */
777 return error_mark_node;
779 if (TREE_CODE (value) == TYPE_DECL && init)
781 error ("typedef %qD is initialized (use __typeof__ instead)", value);
785 /* Pass friendly classes back. */
786 if (value == void_type_node)
789 /* Pass friend decls back. */
790 if ((TREE_CODE (value) == FUNCTION_DECL
791 || TREE_CODE (value) == TEMPLATE_DECL)
792 && DECL_CONTEXT (value) != current_class_type)
795 if (DECL_NAME (value) != NULL_TREE
796 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
797 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
798 error ("member %qD conflicts with virtual function table field name",
801 /* Stash away type declarations. */
802 if (TREE_CODE (value) == TYPE_DECL)
804 DECL_NONLOCAL (value) = 1;
805 DECL_CONTEXT (value) = current_class_type;
807 if (processing_template_decl)
808 value = push_template_decl (value);
812 /* Avoid storing attributes in template parameters:
813 tsubst is not ready to handle them. */
814 tree type = TREE_TYPE (value);
815 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
816 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
817 sorry ("applying attributes to template parameters is not implemented");
819 cplus_decl_attributes (&value, attrlist, 0);
825 if (DECL_IN_AGGR_P (value))
827 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
828 return void_type_node;
831 if (asmspec_tree && asmspec_tree != error_mark_node)
832 asmspec = TREE_STRING_POINTER (asmspec_tree);
836 if (TREE_CODE (value) == FUNCTION_DECL)
838 /* Initializers for functions are rejected early in the parser.
839 If we get here, it must be a pure specifier for a method. */
840 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
842 gcc_assert (error_operand_p (init) || integer_zerop (init));
843 DECL_PURE_VIRTUAL_P (value) = 1;
847 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
848 error ("initializer specified for static member function %qD",
852 else if (pedantic && TREE_CODE (value) != VAR_DECL)
853 /* Already complained in grokdeclarator. */
855 else if (!processing_template_decl)
857 if (TREE_CODE (init) == CONSTRUCTOR)
858 init = digest_init (TREE_TYPE (value), init);
860 init = integral_constant_value (init);
862 if (init != error_mark_node && !TREE_CONSTANT (init))
864 /* We can allow references to things that are effectively
865 static, since references are initialized with the
867 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
868 || (TREE_STATIC (init) == 0
869 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
871 error ("field initializer is not constant");
872 init = error_mark_node;
878 if (processing_template_decl
879 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
881 value = push_template_decl (value);
882 if (error_operand_p (value))
883 return error_mark_node;
887 cplus_decl_attributes (&value, attrlist, 0);
889 switch (TREE_CODE (value))
892 finish_static_data_member_decl (value, init, init_const_expr_p,
893 asmspec_tree, flags);
898 error ("%<asm%> specifiers are not permitted on non-static data members");
899 if (DECL_INITIAL (value) == error_mark_node)
900 init = error_mark_node;
901 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
903 DECL_INITIAL (value) = init;
904 DECL_IN_AGGR_P (value) = 1;
909 set_user_assembler_name (value, asmspec);
911 cp_finish_decl (value,
913 /*init_const_expr_p=*/false,
914 asmspec_tree, flags);
916 /* Pass friends back this way. */
917 if (DECL_FRIEND_P (value))
918 return void_type_node;
920 DECL_IN_AGGR_P (value) = 1;
929 /* Like `grokfield', but for bitfields.
930 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
933 grokbitfield (const cp_declarator *declarator,
934 cp_decl_specifier_seq *declspecs, tree width)
936 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
938 if (value == error_mark_node)
939 return NULL_TREE; /* friends went bad. */
941 /* Pass friendly classes back. */
942 if (TREE_CODE (value) == VOID_TYPE)
943 return void_type_node;
945 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
946 && (POINTER_TYPE_P (value)
947 || !dependent_type_p (TREE_TYPE (value))))
949 error ("bit-field %qD with non-integral type", value);
950 return error_mark_node;
953 if (TREE_CODE (value) == TYPE_DECL)
955 error ("cannot declare %qD to be a bit-field type", value);
959 /* Usually, finish_struct_1 catches bitfields with invalid types.
960 But, in the case of bitfields with function type, we confuse
961 ourselves into thinking they are member functions, so we must
963 if (TREE_CODE (value) == FUNCTION_DECL)
965 error ("cannot declare bit-field %qD with function type",
970 if (DECL_IN_AGGR_P (value))
972 error ("%qD is already defined in the class %qT", value,
973 DECL_CONTEXT (value));
974 return void_type_node;
977 if (TREE_STATIC (value))
979 error ("static member %qD cannot be a bit-field", value);
982 finish_decl (value, NULL_TREE, NULL_TREE);
984 if (width != error_mark_node)
986 constant_expression_warning (width);
987 DECL_INITIAL (value) = width;
988 SET_DECL_C_BIT_FIELD (value);
991 DECL_IN_AGGR_P (value) = 1;
997 cplus_decl_attributes (tree *decl, tree attributes, int flags)
999 if (*decl == NULL_TREE || *decl == void_type_node
1000 || *decl == error_mark_node)
1003 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1004 decl = &DECL_TEMPLATE_RESULT (*decl);
1006 decl_attributes (decl, attributes, flags);
1008 if (TREE_CODE (*decl) == TYPE_DECL)
1009 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1012 /* Walks through the namespace- or function-scope anonymous union
1013 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1014 Returns one of the fields for use in the mangled name. */
1017 build_anon_union_vars (tree type, tree object)
1019 tree main_decl = NULL_TREE;
1022 /* Rather than write the code to handle the non-union case,
1023 just give an error. */
1024 if (TREE_CODE (type) != UNION_TYPE)
1025 error ("anonymous struct not inside named type");
1027 for (field = TYPE_FIELDS (type);
1029 field = TREE_CHAIN (field))
1034 if (DECL_ARTIFICIAL (field))
1036 if (TREE_CODE (field) != FIELD_DECL)
1038 pedwarn ("%q+#D invalid; an anonymous union can only "
1039 "have non-static data members", field);
1043 if (TREE_PRIVATE (field))
1044 pedwarn ("private member %q+#D in anonymous union", field);
1045 else if (TREE_PROTECTED (field))
1046 pedwarn ("protected member %q+#D in anonymous union", field);
1048 if (processing_template_decl)
1049 ref = build_min_nt (COMPONENT_REF, object,
1050 DECL_NAME (field), NULL_TREE);
1052 ref = build_class_member_access_expr (object, field, NULL_TREE,
1055 if (DECL_NAME (field))
1059 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1061 base = get_base_address (object);
1062 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1063 TREE_STATIC (decl) = TREE_STATIC (base);
1064 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1066 SET_DECL_VALUE_EXPR (decl, ref);
1067 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1069 decl = pushdecl (decl);
1071 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1072 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1076 if (main_decl == NULL_TREE)
1083 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1084 anonymous union, then all members must be laid out together. PUBLIC_P
1085 is nonzero if this union is not declared static. */
1088 finish_anon_union (tree anon_union_decl)
1094 if (anon_union_decl == error_mark_node)
1097 type = TREE_TYPE (anon_union_decl);
1098 public_p = TREE_PUBLIC (anon_union_decl);
1100 /* The VAR_DECL's context is the same as the TYPE's context. */
1101 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1103 if (TYPE_FIELDS (type) == NULL_TREE)
1108 error ("namespace-scope anonymous aggregates must be static");
1112 main_decl = build_anon_union_vars (type, anon_union_decl);
1113 if (main_decl == error_mark_node)
1115 if (main_decl == NULL_TREE)
1117 warning (0, "anonymous union with no members");
1121 if (!processing_template_decl)
1123 /* Use main_decl to set the mangled name. */
1124 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1125 mangle_decl (anon_union_decl);
1126 DECL_NAME (anon_union_decl) = NULL_TREE;
1129 pushdecl (anon_union_decl);
1130 if (building_stmt_tree ()
1131 && at_function_scope_p ())
1132 add_decl_expr (anon_union_decl);
1133 else if (!processing_template_decl)
1134 rest_of_decl_compilation (anon_union_decl,
1135 toplevel_bindings_p (), at_eof);
1138 /* Auxiliary functions to make type signatures for
1139 `operator new' and `operator delete' correspond to
1140 what compiler will be expecting. */
1143 coerce_new_type (tree type)
1146 tree args = TYPE_ARG_TYPES (type);
1148 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1150 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1153 error ("%<operator new%> must return type %qT", ptr_type_node);
1156 if (!args || args == void_list_node
1157 || !same_type_p (TREE_VALUE (args), size_type_node))
1160 if (args && args != void_list_node)
1161 args = TREE_CHAIN (args);
1162 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1163 "as first parameter", size_type_node);
1168 args = tree_cons (NULL_TREE, size_type_node, args);
1171 type = build_exception_variant
1172 (build_function_type (ptr_type_node, args),
1173 TYPE_RAISES_EXCEPTIONS (type));
1181 coerce_delete_type (tree type)
1184 tree args = TYPE_ARG_TYPES (type);
1186 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1188 if (!same_type_p (TREE_TYPE (type), void_type_node))
1191 error ("%<operator delete%> must return type %qT", void_type_node);
1194 if (!args || args == void_list_node
1195 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1198 if (args && args != void_list_node)
1199 args = TREE_CHAIN (args);
1200 error ("%<operator delete%> takes type %qT as first parameter",
1206 args = tree_cons (NULL_TREE, ptr_type_node, args);
1209 type = build_exception_variant
1210 (build_function_type (void_type_node, args),
1211 TYPE_RAISES_EXCEPTIONS (type));
1220 mark_vtable_entries (tree decl)
1223 unsigned HOST_WIDE_INT idx;
1225 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1230 STRIP_NOPS (fnaddr);
1232 if (TREE_CODE (fnaddr) != ADDR_EXPR
1233 && TREE_CODE (fnaddr) != FDESC_EXPR)
1234 /* This entry is an offset: a virtual base class offset, a
1235 virtual call offset, an RTTI offset, etc. */
1238 fn = TREE_OPERAND (fnaddr, 0);
1239 TREE_ADDRESSABLE (fn) = 1;
1240 /* When we don't have vcall offsets, we output thunks whenever
1241 we output the vtables that contain them. With vcall offsets,
1242 we know all the thunks we'll need when we emit a virtual
1243 function, so we emit the thunks there instead. */
1244 if (DECL_THUNK_P (fn))
1245 use_thunk (fn, /*emit_p=*/0);
1250 /* Set DECL up to have the closest approximation of "initialized common"
1251 linkage available. */
1254 comdat_linkage (tree decl)
1257 make_decl_one_only (decl);
1258 else if (TREE_CODE (decl) == FUNCTION_DECL
1259 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1260 /* We can just emit function and compiler-generated variables
1261 statically; having multiple copies is (for the most part) only
1264 There are two correctness issues, however: the address of a
1265 template instantiation with external linkage should be the
1266 same, independent of what translation unit asks for the
1267 address, and this will not hold when we emit multiple copies of
1268 the function. However, there's little else we can do.
1270 Also, by default, the typeinfo implementation assumes that
1271 there will be only one copy of the string used as the name for
1272 each type. Therefore, if weak symbols are unavailable, the
1273 run-time library should perform a more conservative check; it
1274 should perform a string comparison, rather than an address
1276 TREE_PUBLIC (decl) = 0;
1279 /* Static data member template instantiations, however, cannot
1280 have multiple copies. */
1281 if (DECL_INITIAL (decl) == 0
1282 || DECL_INITIAL (decl) == error_mark_node)
1283 DECL_COMMON (decl) = 1;
1284 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1286 DECL_COMMON (decl) = 1;
1287 DECL_INITIAL (decl) = error_mark_node;
1289 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1291 /* We can't do anything useful; leave vars for explicit
1293 DECL_EXTERNAL (decl) = 1;
1294 DECL_NOT_REALLY_EXTERN (decl) = 0;
1298 if (DECL_LANG_SPECIFIC (decl))
1299 DECL_COMDAT (decl) = 1;
1302 /* For win32 we also want to put explicit instantiations in
1303 linkonce sections, so that they will be merged with implicit
1304 instantiations; otherwise we get duplicate symbol errors.
1305 For Darwin we do not want explicit instantiations to be
1309 maybe_make_one_only (tree decl)
1311 /* We used to say that this was not necessary on targets that support weak
1312 symbols, because the implicit instantiations will defer to the explicit
1313 one. However, that's not actually the case in SVR4; a strong definition
1314 after a weak one is an error. Also, not making explicit
1315 instantiations one_only means that we can end up with two copies of
1316 some template instantiations. */
1320 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1321 we can get away with not emitting them if they aren't used. We need
1322 to for variables so that cp_finish_decl will update their linkage,
1323 because their DECL_INITIAL may not have been set properly yet. */
1325 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1326 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1327 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1329 make_decl_one_only (decl);
1331 if (TREE_CODE (decl) == VAR_DECL)
1333 DECL_COMDAT (decl) = 1;
1334 /* Mark it needed so we don't forget to emit it. */
1335 mark_decl_referenced (decl);
1340 /* Determine whether or not we want to specifically import or export CTYPE,
1341 using various heuristics. */
1344 import_export_class (tree ctype)
1346 /* -1 for imported, 1 for exported. */
1347 int import_export = 0;
1349 /* It only makes sense to call this function at EOF. The reason is
1350 that this function looks at whether or not the first non-inline
1351 non-abstract virtual member function has been defined in this
1352 translation unit. But, we can't possibly know that until we've
1353 seen the entire translation unit. */
1354 gcc_assert (at_eof);
1356 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1359 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1360 we will have CLASSTYPE_INTERFACE_ONLY set but not
1361 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1362 heuristic because someone will supply a #pragma implementation
1363 elsewhere, and deducing it here would produce a conflict. */
1364 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1367 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1369 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1371 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1372 && !flag_implicit_templates)
1373 /* For a template class, without -fimplicit-templates, check the
1374 repository. If the virtual table is assigned to this
1375 translation unit, then export the class; otherwise, import
1377 import_export = repo_export_class_p (ctype) ? 1 : -1;
1378 else if (TYPE_POLYMORPHIC_P (ctype))
1380 /* The ABI specifies that the virtual table and associated
1381 information are emitted with the key method, if any. */
1382 tree method = CLASSTYPE_KEY_METHOD (ctype);
1383 /* If weak symbol support is not available, then we must be
1384 careful not to emit the vtable when the key function is
1385 inline. An inline function can be defined in multiple
1386 translation units. If we were to emit the vtable in each
1387 translation unit containing a definition, we would get
1388 multiple definition errors at link-time. */
1389 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1390 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1393 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1394 a definition anywhere else. */
1395 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1398 /* Allow back ends the chance to overrule the decision. */
1399 if (targetm.cxx.import_export_class)
1400 import_export = targetm.cxx.import_export_class (ctype, import_export);
1404 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1405 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1409 /* Return true if VAR has already been provided to the back end; in that
1410 case VAR should not be modified further by the front end. */
1412 var_finalized_p (tree var)
1414 return varpool_node (var)->finalized;
1417 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1418 must be emitted in this translation unit. Mark it as such. */
1421 mark_needed (tree decl)
1423 /* It's possible that we no longer need to set
1424 TREE_SYMBOL_REFERENCED here directly, but doing so is
1426 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1427 mark_decl_referenced (decl);
1430 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1431 returns true if a definition of this entity should be provided in
1432 this object file. Callers use this function to determine whether
1433 or not to let the back end know that a definition of DECL is
1434 available in this translation unit. */
1437 decl_needed_p (tree decl)
1439 gcc_assert (TREE_CODE (decl) == VAR_DECL
1440 || TREE_CODE (decl) == FUNCTION_DECL);
1441 /* This function should only be called at the end of the translation
1442 unit. We cannot be sure of whether or not something will be
1443 COMDAT until that point. */
1444 gcc_assert (at_eof);
1446 /* All entities with external linkage that are not COMDAT should be
1447 emitted; they may be referred to from other object files. */
1448 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1450 /* If this entity was used, let the back end see it; it will decide
1451 whether or not to emit it into the object file. */
1452 if (TREE_USED (decl)
1453 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1454 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1456 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1457 reference to DECL might cause it to be emitted later. */
1461 /* If necessary, write out the vtables for the dynamic class CTYPE.
1462 Returns true if any vtables were emitted. */
1465 maybe_emit_vtables (tree ctype)
1471 /* If the vtables for this class have already been emitted there is
1472 nothing more to do. */
1473 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1474 if (var_finalized_p (primary_vtbl))
1476 /* Ignore dummy vtables made by get_vtable_decl. */
1477 if (TREE_TYPE (primary_vtbl) == void_type_node)
1480 /* On some targets, we cannot determine the key method until the end
1481 of the translation unit -- which is when this function is
1483 if (!targetm.cxx.key_method_may_be_inline ())
1484 determine_key_method (ctype);
1486 /* See if any of the vtables are needed. */
1487 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1489 import_export_decl (vtbl);
1490 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1495 /* If the references to this class' vtables are optimized away,
1496 still emit the appropriate debugging information. See
1498 if (DECL_COMDAT (primary_vtbl)
1499 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1500 note_debug_info_needed (ctype);
1504 /* The ABI requires that we emit all of the vtables if we emit any
1506 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1508 /* Mark entities references from the virtual table as used. */
1509 mark_vtable_entries (vtbl);
1511 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1513 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1515 /* It had better be all done at compile-time. */
1520 DECL_EXTERNAL (vtbl) = 0;
1521 rest_of_decl_compilation (vtbl, 1, 1);
1523 /* Because we're only doing syntax-checking, we'll never end up
1524 actually marking the variable as written. */
1525 if (flag_syntax_only)
1526 TREE_ASM_WRITTEN (vtbl) = 1;
1529 /* Since we're writing out the vtable here, also write the debug
1531 note_debug_info_needed (ctype);
1536 /* A special return value from type_visibility meaning internal
1539 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1541 /* walk_tree helper function for type_visibility. */
1544 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1546 int *vis_p = (int *)data;
1551 else if (CLASS_TYPE_P (*tp))
1553 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1555 *vis_p = VISIBILITY_ANON;
1558 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1559 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1564 /* Returns the visibility of TYPE, which is the minimum visibility of its
1568 type_visibility (tree type)
1570 int vis = VISIBILITY_DEFAULT;
1571 walk_tree_without_duplicates (&type, min_vis_r, &vis);
1575 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1576 specified (or if VISIBILITY is static). */
1579 constrain_visibility (tree decl, int visibility)
1581 if (visibility == VISIBILITY_ANON)
1583 /* extern "C" declarations aren't affected by the anonymous
1585 if (!DECL_EXTERN_C_P (decl))
1587 TREE_PUBLIC (decl) = 0;
1588 DECL_INTERFACE_KNOWN (decl) = 1;
1589 if (DECL_LANG_SPECIFIC (decl))
1590 DECL_NOT_REALLY_EXTERN (decl) = 1;
1593 else if (visibility > DECL_VISIBILITY (decl)
1594 && !DECL_VISIBILITY_SPECIFIED (decl))
1596 DECL_VISIBILITY (decl) = visibility;
1602 /* Constrain the visibility of DECL based on the visibility of its template
1606 constrain_visibility_for_template (tree decl, tree targs)
1608 /* If this is a template instantiation, check the innermost
1609 template args for visibility constraints. The outer template
1610 args are covered by the class check. */
1611 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1613 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1617 tree arg = TREE_VEC_ELT (args, i-1);
1619 vis = type_visibility (arg);
1620 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1623 if (TREE_CODE (arg) == ADDR_EXPR)
1624 arg = TREE_OPERAND (arg, 0);
1625 if (TREE_CODE (arg) == VAR_DECL
1626 || TREE_CODE (arg) == FUNCTION_DECL)
1628 if (! TREE_PUBLIC (arg))
1629 vis = VISIBILITY_ANON;
1631 vis = DECL_VISIBILITY (arg);
1635 constrain_visibility (decl, vis);
1639 /* Like c_determine_visibility, but with additional C++-specific
1642 Function-scope entities can rely on the function's visibility because
1643 it is set in start_preparsed_function.
1645 Class-scope entities cannot rely on the class's visibility until the end
1646 of the enclosing class definition.
1648 Note that because namespaces have multiple independent definitions,
1649 namespace visibility is handled elsewhere using the #pragma visibility
1650 machinery rather than by decorating the namespace declaration.
1652 The goal is for constraints from the type to give a diagnostic, and
1653 other constraints to be applied silently. */
1656 determine_visibility (tree decl)
1658 tree class_type = NULL_TREE;
1661 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1663 /* Only relevant for names with external linkage. */
1664 if (!TREE_PUBLIC (decl))
1667 /* Cloned constructors and destructors get the same visibility as
1668 the underlying function. That should be set up in
1669 maybe_clone_body. */
1670 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1672 if (TREE_CODE (decl) == TYPE_DECL)
1674 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1675 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1676 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1681 else if (DECL_LANG_SPECIFIC (decl))
1682 use_template = DECL_USE_TEMPLATE (decl);
1686 /* Anything that is exported must have default visibility. */
1687 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1688 && lookup_attribute ("dllexport",
1689 TREE_CODE (decl) == TYPE_DECL
1690 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
1691 : DECL_ATTRIBUTES (decl)))
1693 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1694 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1697 /* If DECL is a member of a class, visibility specifiers on the
1698 class can influence the visibility of the DECL. */
1699 if (DECL_CLASS_SCOPE_P (decl))
1700 class_type = DECL_CONTEXT (decl);
1701 else if (TREE_CODE (decl) == VAR_DECL
1702 && DECL_TINFO_P (decl)
1703 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1704 class_type = TREE_TYPE (DECL_NAME (decl));
1707 /* Not a class member. */
1709 /* Virtual tables have DECL_CONTEXT set to their associated class,
1710 so they are automatically handled above. */
1711 gcc_assert (TREE_CODE (decl) != VAR_DECL
1712 || !DECL_VTABLE_OR_VTT_P (decl));
1714 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1716 /* Local statics and classes get the visibility of their
1717 containing function by default, except that
1718 -fvisibility-inlines-hidden doesn't affect them. */
1719 tree fn = DECL_CONTEXT (decl);
1720 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1722 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1723 DECL_VISIBILITY_SPECIFIED (decl) =
1724 DECL_VISIBILITY_SPECIFIED (fn);
1727 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1729 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1730 but have no TEMPLATE_INFO, so don't try to check it. */
1733 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1735 /* tinfo visibility is based on the type it's for. */
1736 constrain_visibility
1737 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1739 else if (use_template)
1740 /* Template instantiations and specializations get visibility based
1741 on their template unless they override it with an attribute. */;
1742 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1744 /* Set default visibility to whatever the user supplied with
1745 #pragma GCC visibility or a namespace visibility attribute. */
1746 DECL_VISIBILITY (decl) = default_visibility;
1747 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1753 /* If the specialization doesn't specify visibility, use the
1754 visibility from the template. */
1755 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1756 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1757 : DECL_TEMPLATE_INFO (decl));
1758 tree args = TI_ARGS (tinfo);
1760 if (args != error_mark_node)
1762 int depth = TMPL_ARGS_DEPTH (args);
1763 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1765 if (!DECL_VISIBILITY_SPECIFIED (decl))
1767 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1768 DECL_VISIBILITY_SPECIFIED (decl)
1769 = DECL_VISIBILITY_SPECIFIED (pattern);
1772 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1773 if (args && depth > template_class_depth (class_type))
1774 /* Limit visibility based on its template arguments. */
1775 constrain_visibility_for_template (decl, args);
1780 determine_visibility_from_class (decl, class_type);
1782 if (decl_anon_ns_mem_p (decl))
1783 /* Names in an anonymous namespace get internal linkage.
1784 This might change once we implement export. */
1785 constrain_visibility (decl, VISIBILITY_ANON);
1786 else if (TREE_CODE (decl) != TYPE_DECL)
1788 /* Propagate anonymity from type to decl. */
1789 int tvis = type_visibility (TREE_TYPE (decl));
1790 if (tvis == VISIBILITY_ANON)
1791 constrain_visibility (decl, tvis);
1795 /* By default, static data members and function members receive
1796 the visibility of their containing class. */
1799 determine_visibility_from_class (tree decl, tree class_type)
1801 if (visibility_options.inlines_hidden
1802 /* Don't do this for inline templates; specializations might not be
1803 inline, and we don't want them to inherit the hidden
1804 visibility. We'll set it here for all inline instantiations. */
1805 && !processing_template_decl
1806 && ! DECL_VISIBILITY_SPECIFIED (decl)
1807 && TREE_CODE (decl) == FUNCTION_DECL
1808 && DECL_DECLARED_INLINE_P (decl)
1809 && (! DECL_LANG_SPECIFIC (decl)
1810 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1811 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1812 else if (!DECL_VISIBILITY_SPECIFIED (decl))
1814 /* Default to the class visibility. */
1815 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1816 DECL_VISIBILITY_SPECIFIED (decl)
1817 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1820 /* Give the target a chance to override the visibility associated
1822 if (TREE_CODE (decl) == VAR_DECL
1823 && (DECL_TINFO_P (decl)
1824 || (DECL_VTABLE_OR_VTT_P (decl)
1825 /* Construction virtual tables are not exported because
1826 they cannot be referred to from other object files;
1827 their name is not standardized by the ABI. */
1828 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1829 && TREE_PUBLIC (decl)
1830 && !DECL_REALLY_EXTERN (decl)
1831 && !DECL_VISIBILITY_SPECIFIED (decl)
1832 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1833 targetm.cxx.determine_class_data_visibility (decl);
1836 /* Constrain the visibility of a class TYPE based on the visibility of its
1837 field types. Warn if any fields require lesser visibility. */
1840 constrain_class_visibility (tree type)
1846 int vis = type_visibility (type);
1848 if (vis == VISIBILITY_ANON
1849 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1852 /* Don't warn about visibility if the class has explicit visibility. */
1853 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1854 vis = VISIBILITY_INTERNAL;
1856 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1857 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1859 tree ftype = strip_array_types (TREE_TYPE (t));
1860 int subvis = type_visibility (ftype);
1862 if (subvis == VISIBILITY_ANON)
1864 %qT has a field %qD whose type uses the anonymous namespace",
1866 else if (IS_AGGR_TYPE (ftype)
1867 && vis < VISIBILITY_HIDDEN
1868 && subvis >= VISIBILITY_HIDDEN)
1869 warning (OPT_Wattributes, "\
1870 %qT declared with greater visibility than the type of its field %qD",
1874 binfo = TYPE_BINFO (type);
1875 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1877 int subvis = type_visibility (TREE_TYPE (t));
1879 if (subvis == VISIBILITY_ANON)
1881 %qT has a base %qT whose type uses the anonymous namespace",
1882 type, TREE_TYPE (t));
1883 else if (vis < VISIBILITY_HIDDEN
1884 && subvis >= VISIBILITY_HIDDEN)
1885 warning (OPT_Wattributes, "\
1886 %qT declared with greater visibility than its base %qT",
1887 type, TREE_TYPE (t));
1891 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1892 for DECL has not already been determined, do so now by setting
1893 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1894 function is called entities with vague linkage whose definitions
1895 are available must have TREE_PUBLIC set.
1897 If this function decides to place DECL in COMDAT, it will set
1898 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1899 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1900 callers defer that decision until it is clear that DECL is actually
1904 import_export_decl (tree decl)
1909 tree class_type = NULL_TREE;
1911 if (DECL_INTERFACE_KNOWN (decl))
1914 /* We cannot determine what linkage to give to an entity with vague
1915 linkage until the end of the file. For example, a virtual table
1916 for a class will be defined if and only if the key method is
1917 defined in this translation unit. As a further example, consider
1918 that when compiling a translation unit that uses PCH file with
1919 "-frepo" it would be incorrect to make decisions about what
1920 entities to emit when building the PCH; those decisions must be
1921 delayed until the repository information has been processed. */
1922 gcc_assert (at_eof);
1923 /* Object file linkage for explicit instantiations is handled in
1924 mark_decl_instantiated. For static variables in functions with
1925 vague linkage, maybe_commonize_var is used.
1927 Therefore, the only declarations that should be provided to this
1928 function are those with external linkage that are:
1930 * implicit instantiations of function templates
1934 * implicit instantiations of static data members of class
1941 Furthermore, all entities that reach this point must have a
1942 definition available in this translation unit.
1944 The following assertions check these conditions. */
1945 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1946 || TREE_CODE (decl) == VAR_DECL);
1947 /* Any code that creates entities with TREE_PUBLIC cleared should
1948 also set DECL_INTERFACE_KNOWN. */
1949 gcc_assert (TREE_PUBLIC (decl));
1950 if (TREE_CODE (decl) == FUNCTION_DECL)
1951 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1952 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1953 || DECL_DECLARED_INLINE_P (decl));
1955 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1956 || DECL_VTABLE_OR_VTT_P (decl)
1957 || DECL_TINFO_P (decl));
1958 /* Check that a definition of DECL is available in this translation
1960 gcc_assert (!DECL_REALLY_EXTERN (decl));
1962 /* Assume that DECL will not have COMDAT linkage. */
1964 /* Assume that DECL will not be imported into this translation
1968 /* See if the repository tells us whether or not to emit DECL in
1969 this translation unit. */
1970 emit_p = repo_emit_p (decl);
1973 else if (emit_p == 1)
1975 /* The repository indicates that this entity should be defined
1976 here. Make sure the back end honors that request. */
1977 if (TREE_CODE (decl) == VAR_DECL)
1979 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1980 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1983 FOR_EACH_CLONE (clone, decl)
1984 mark_needed (clone);
1988 /* Output the definition as an ordinary strong definition. */
1989 DECL_EXTERNAL (decl) = 0;
1990 DECL_INTERFACE_KNOWN (decl) = 1;
1995 /* We have already decided what to do with this DECL; there is no
1996 need to check anything further. */
1998 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2000 class_type = DECL_CONTEXT (decl);
2001 import_export_class (class_type);
2002 if (TYPE_FOR_JAVA (class_type))
2004 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2005 && CLASSTYPE_INTERFACE_ONLY (class_type))
2007 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2008 && !CLASSTYPE_USE_TEMPLATE (class_type)
2009 && CLASSTYPE_KEY_METHOD (class_type)
2010 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2011 /* The ABI requires that all virtual tables be emitted with
2012 COMDAT linkage. However, on systems where COMDAT symbols
2013 don't show up in the table of contents for a static
2014 archive, or on systems without weak symbols (where we
2015 approximate COMDAT linkage by using internal linkage), the
2016 linker will report errors about undefined symbols because
2017 it will not see the virtual table definition. Therefore,
2018 in the case that we know that the virtual table will be
2019 emitted in only one translation unit, we make the virtual
2020 table an ordinary definition with external linkage. */
2021 DECL_EXTERNAL (decl) = 0;
2022 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2024 /* CLASS_TYPE is being exported from this translation unit,
2025 so DECL should be defined here. */
2026 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2027 /* If a class is declared in a header with the "extern
2028 template" extension, then it will not be instantiated,
2029 even in translation units that would normally require
2030 it. Often such classes are explicitly instantiated in
2031 one translation unit. Therefore, the explicit
2032 instantiation must be made visible to other translation
2034 DECL_EXTERNAL (decl) = 0;
2037 /* The generic C++ ABI says that class data is always
2038 COMDAT, even if there is a key function. Some
2039 variants (e.g., the ARM EABI) says that class data
2040 only has COMDAT linkage if the class data might be
2041 emitted in more than one translation unit. When the
2042 key method can be inline and is inline, we still have
2043 to arrange for comdat even though
2044 class_data_always_comdat is false. */
2045 if (!CLASSTYPE_KEY_METHOD (class_type)
2046 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2047 || targetm.cxx.class_data_always_comdat ())
2049 /* The ABI requires COMDAT linkage. Normally, we
2050 only emit COMDAT things when they are needed;
2051 make sure that we realize that this entity is
2058 else if (!flag_implicit_templates
2059 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2064 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2066 tree type = TREE_TYPE (DECL_NAME (decl));
2067 if (CLASS_TYPE_P (type))
2070 import_export_class (type);
2071 if (CLASSTYPE_INTERFACE_KNOWN (type)
2072 && TYPE_POLYMORPHIC_P (type)
2073 && CLASSTYPE_INTERFACE_ONLY (type)
2074 /* If -fno-rtti was specified, then we cannot be sure
2075 that RTTI information will be emitted with the
2076 virtual table of the class, so we must emit it
2077 wherever it is used. */
2082 if (CLASSTYPE_INTERFACE_KNOWN (type)
2083 && !CLASSTYPE_INTERFACE_ONLY (type))
2085 comdat_p = (targetm.cxx.class_data_always_comdat ()
2086 || (CLASSTYPE_KEY_METHOD (type)
2087 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2092 DECL_EXTERNAL (decl) = 0;
2102 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2103 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2105 /* DECL is an implicit instantiation of a function or static
2107 if (flag_implicit_templates
2108 || (flag_implicit_inline_templates
2109 && TREE_CODE (decl) == FUNCTION_DECL
2110 && DECL_DECLARED_INLINE_P (decl)))
2113 /* If we are not implicitly generating templates, then mark
2114 this entity as undefined in this translation unit. */
2117 else if (DECL_FUNCTION_MEMBER_P (decl))
2119 if (!DECL_DECLARED_INLINE_P (decl))
2121 tree ctype = DECL_CONTEXT (decl);
2122 import_export_class (ctype);
2123 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2125 DECL_NOT_REALLY_EXTERN (decl)
2126 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2127 || (DECL_DECLARED_INLINE_P (decl)
2128 && ! flag_implement_inlines
2129 && !DECL_VINDEX (decl)));
2131 if (!DECL_NOT_REALLY_EXTERN (decl))
2132 DECL_EXTERNAL (decl) = 1;
2134 /* Always make artificials weak. */
2135 if (DECL_ARTIFICIAL (decl) && flag_weak)
2138 maybe_make_one_only (decl);
2149 /* If we are importing DECL into this translation unit, mark is
2150 an undefined here. */
2151 DECL_EXTERNAL (decl) = 1;
2152 DECL_NOT_REALLY_EXTERN (decl) = 0;
2156 /* If we decided to put DECL in COMDAT, mark it accordingly at
2158 comdat_linkage (decl);
2161 DECL_INTERFACE_KNOWN (decl) = 1;
2164 /* Return an expression that performs the destruction of DECL, which
2165 must be a VAR_DECL whose type has a non-trivial destructor, or is
2166 an array whose (innermost) elements have a non-trivial destructor. */
2169 build_cleanup (tree decl)
2172 tree type = TREE_TYPE (decl);
2174 /* This function should only be called for declarations that really
2175 require cleanups. */
2176 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2178 /* Treat all objects with destructors as used; the destructor may do
2179 something substantive. */
2182 if (TREE_CODE (type) == ARRAY_TYPE)
2186 cxx_mark_addressable (decl);
2187 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
2189 temp = build_delete (TREE_TYPE (temp), temp,
2190 sfk_complete_destructor,
2191 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2195 /* Returns the initialization guard variable for the variable DECL,
2196 which has static storage duration. */
2199 get_guard (tree decl)
2204 sname = mangle_guard_variable (decl);
2205 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2210 /* We use a type that is big enough to contain a mutex as well
2211 as an integer counter. */
2212 guard_type = targetm.cxx.guard_type ();
2213 guard = build_decl (VAR_DECL, sname, guard_type);
2215 /* The guard should have the same linkage as what it guards. */
2216 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2217 TREE_STATIC (guard) = TREE_STATIC (decl);
2218 DECL_COMMON (guard) = DECL_COMMON (decl);
2219 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2220 if (TREE_PUBLIC (decl))
2221 DECL_WEAK (guard) = DECL_WEAK (decl);
2223 DECL_ARTIFICIAL (guard) = 1;
2224 DECL_IGNORED_P (guard) = 1;
2225 TREE_USED (guard) = 1;
2226 pushdecl_top_level_and_finish (guard, NULL_TREE);
2231 /* Return those bits of the GUARD variable that should be set when the
2232 guarded entity is actually initialized. */
2235 get_guard_bits (tree guard)
2237 if (!targetm.cxx.guard_mask_bit ())
2239 /* We only set the first byte of the guard, in order to leave room
2240 for a mutex in the high-order bits. */
2241 guard = build1 (ADDR_EXPR,
2242 build_pointer_type (TREE_TYPE (guard)),
2244 guard = build1 (NOP_EXPR,
2245 build_pointer_type (char_type_node),
2247 guard = build1 (INDIRECT_REF, char_type_node, guard);
2253 /* Return an expression which determines whether or not the GUARD
2254 variable has already been initialized. */
2257 get_guard_cond (tree guard)
2261 /* Check to see if the GUARD is zero. */
2262 guard = get_guard_bits (guard);
2264 /* Mask off all but the low bit. */
2265 if (targetm.cxx.guard_mask_bit ())
2267 guard_value = integer_one_node;
2268 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2269 guard_value = convert (TREE_TYPE (guard), guard_value);
2270 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2273 guard_value = integer_zero_node;
2274 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2275 guard_value = convert (TREE_TYPE (guard), guard_value);
2276 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2279 /* Return an expression which sets the GUARD variable, indicating that
2280 the variable being guarded has been initialized. */
2283 set_guard (tree guard)
2287 /* Set the GUARD to one. */
2288 guard = get_guard_bits (guard);
2289 guard_init = integer_one_node;
2290 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2291 guard_init = convert (TREE_TYPE (guard), guard_init);
2292 return build_modify_expr (guard, NOP_EXPR, guard_init);
2295 /* Start the process of running a particular set of global constructors
2296 or destructors. Subroutine of do_[cd]tors. */
2299 start_objects (int method_type, int initp)
2305 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2307 if (initp != DEFAULT_INIT_PRIORITY)
2317 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2320 sprintf (type, "%c", method_type);
2322 fndecl = build_lang_decl (FUNCTION_DECL,
2323 get_file_function_name (type),
2324 build_function_type (void_type_node,
2326 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2328 /* It can be a static function as long as collect2 does not have
2329 to scan the object file to find its ctor/dtor routine. */
2330 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2332 /* Mark this declaration as used to avoid spurious warnings. */
2333 TREE_USED (current_function_decl) = 1;
2335 /* Mark this function as a global constructor or destructor. */
2336 if (method_type == 'I')
2337 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2339 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2340 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2342 body = begin_compound_stmt (BCS_FN_BODY);
2347 /* Finish the process of running a particular set of global constructors
2348 or destructors. Subroutine of do_[cd]tors. */
2351 finish_objects (int method_type, int initp, tree body)
2356 finish_compound_stmt (body);
2357 fn = finish_function (0);
2358 expand_or_defer_fn (fn);
2360 /* When only doing semantic analysis, and no RTL generation, we
2361 can't call functions that directly emit assembly code; there is
2362 no assembly file in which to put the code. */
2363 if (flag_syntax_only)
2366 if (targetm.have_ctors_dtors)
2368 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2369 cgraph_mark_needed_node (cgraph_node (fn));
2370 if (method_type == 'I')
2371 (* targetm.asm_out.constructor) (fnsym, initp);
2373 (* targetm.asm_out.destructor) (fnsym, initp);
2377 /* The names of the parameters to the function created to handle
2378 initializations and destructions for objects with static storage
2380 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2381 #define PRIORITY_IDENTIFIER "__priority"
2383 /* The name of the function we create to handle initializations and
2384 destructions for objects with static storage duration. */
2385 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2387 /* The declaration for the __INITIALIZE_P argument. */
2388 static GTY(()) tree initialize_p_decl;
2390 /* The declaration for the __PRIORITY argument. */
2391 static GTY(()) tree priority_decl;
2393 /* The declaration for the static storage duration function. */
2394 static GTY(()) tree ssdf_decl;
2396 /* All the static storage duration functions created in this
2397 translation unit. */
2398 static GTY(()) VEC(tree,gc) *ssdf_decls;
2400 /* A map from priority levels to information about that priority
2401 level. There may be many such levels, so efficient lookup is
2403 static splay_tree priority_info_map;
2405 /* Begins the generation of the function that will handle all
2406 initialization and destruction of objects with static storage
2407 duration. The function generated takes two parameters of type
2408 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2409 nonzero, it performs initializations. Otherwise, it performs
2410 destructions. It only performs those initializations or
2411 destructions with the indicated __PRIORITY. The generated function
2414 It is assumed that this function will only be called once per
2415 translation unit. */
2418 start_static_storage_duration_function (unsigned count)
2423 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2425 /* Create the identifier for this function. It will be of the form
2426 SSDF_IDENTIFIER_<number>. */
2427 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2429 /* Create the parameters. */
2430 parm_types = void_list_node;
2431 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2432 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2433 type = build_function_type (void_type_node, parm_types);
2435 /* Create the FUNCTION_DECL itself. */
2436 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2437 get_identifier (id),
2439 TREE_PUBLIC (ssdf_decl) = 0;
2440 DECL_ARTIFICIAL (ssdf_decl) = 1;
2441 DECL_INLINE (ssdf_decl) = 1;
2443 /* Put this function in the list of functions to be called from the
2444 static constructors and destructors. */
2447 ssdf_decls = VEC_alloc (tree, gc, 32);
2449 /* Take this opportunity to initialize the map from priority
2450 numbers to information about that priority level. */
2451 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2452 /*delete_key_fn=*/0,
2453 /*delete_value_fn=*/
2454 (splay_tree_delete_value_fn) &free);
2456 /* We always need to generate functions for the
2457 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2458 priorities later, we'll be sure to find the
2459 DEFAULT_INIT_PRIORITY. */
2460 get_priority_info (DEFAULT_INIT_PRIORITY);
2463 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2465 /* Create the argument list. */
2466 initialize_p_decl = cp_build_parm_decl
2467 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2468 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2469 TREE_USED (initialize_p_decl) = 1;
2470 priority_decl = cp_build_parm_decl
2471 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2472 DECL_CONTEXT (priority_decl) = ssdf_decl;
2473 TREE_USED (priority_decl) = 1;
2475 TREE_CHAIN (initialize_p_decl) = priority_decl;
2476 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2478 /* Put the function in the global scope. */
2479 pushdecl (ssdf_decl);
2481 /* Start the function itself. This is equivalent to declaring the
2484 static void __ssdf (int __initialize_p, init __priority_p);
2486 It is static because we only need to call this function from the
2487 various constructor and destructor functions for this module. */
2488 start_preparsed_function (ssdf_decl,
2489 /*attrs=*/NULL_TREE,
2492 /* Set up the scope of the outermost block in the function. */
2493 body = begin_compound_stmt (BCS_FN_BODY);
2498 /* Finish the generation of the function which performs initialization
2499 and destruction of objects with static storage duration. After
2500 this point, no more such objects can be created. */
2503 finish_static_storage_duration_function (tree body)
2505 /* Close out the function. */
2506 finish_compound_stmt (body);
2507 expand_or_defer_fn (finish_function (0));
2510 /* Return the information about the indicated PRIORITY level. If no
2511 code to handle this level has yet been generated, generate the
2512 appropriate prologue. */
2514 static priority_info
2515 get_priority_info (int priority)
2520 n = splay_tree_lookup (priority_info_map,
2521 (splay_tree_key) priority);
2524 /* Create a new priority information structure, and insert it
2526 pi = XNEW (struct priority_info_s);
2527 pi->initializations_p = 0;
2528 pi->destructions_p = 0;
2529 splay_tree_insert (priority_info_map,
2530 (splay_tree_key) priority,
2531 (splay_tree_value) pi);
2534 pi = (priority_info) n->value;
2539 /* The effective initialization priority of a DECL. */
2541 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2542 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2543 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2545 /* Whether a DECL needs a guard to protect it against multiple
2548 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2549 || DECL_ONE_ONLY (decl) \
2550 || DECL_WEAK (decl)))
2552 /* Set up to handle the initialization or destruction of DECL. If
2553 INITP is nonzero, we are initializing the variable. Otherwise, we
2554 are destroying it. */
2557 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2559 tree guard_if_stmt = NULL_TREE;
2562 /* If we are supposed to destruct and there's a trivial destructor,
2563 nothing has to be done. */
2565 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2568 /* Trick the compiler into thinking we are at the file and line
2569 where DECL was declared so that error-messages make sense, and so
2570 that the debugger will show somewhat sensible file and line
2572 input_location = DECL_SOURCE_LOCATION (decl);
2578 Access control for implicit calls to the constructors,
2579 the conversion functions, or the destructor called to
2580 create and destroy a static data member is performed as
2581 if these calls appeared in the scope of the member's
2584 we pretend we are in a static member function of the class of
2585 which the DECL is a member. */
2586 if (member_p (decl))
2588 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2589 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2592 /* Assume we don't need a guard. */
2594 /* We need a guard if this is an object with external linkage that
2595 might be initialized in more than one place. (For example, a
2596 static data member of a template, when the data member requires
2598 if (NEEDS_GUARD_P (decl))
2602 guard = get_guard (decl);
2604 /* When using __cxa_atexit, we just check the GUARD as we would
2605 for a local static. */
2606 if (flag_use_cxa_atexit)
2608 /* When using __cxa_atexit, we never try to destroy
2609 anything from a static destructor. */
2611 guard_cond = get_guard_cond (guard);
2613 /* If we don't have __cxa_atexit, then we will be running
2614 destructors from .fini sections, or their equivalents. So,
2615 we need to know how many times we've tried to initialize this
2616 object. We do initializations only if the GUARD is zero,
2617 i.e., if we are the first to initialize the variable. We do
2618 destructions only if the GUARD is one, i.e., if we are the
2619 last to destroy the variable. */
2622 = cp_build_binary_op (EQ_EXPR,
2623 build_unary_op (PREINCREMENT_EXPR,
2629 = cp_build_binary_op (EQ_EXPR,
2630 build_unary_op (PREDECREMENT_EXPR,
2635 guard_if_stmt = begin_if_stmt ();
2636 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2640 /* If we're using __cxa_atexit, we have not already set the GUARD,
2641 so we must do so now. */
2642 if (guard && initp && flag_use_cxa_atexit)
2643 finish_expr_stmt (set_guard (guard));
2645 /* Perform the initialization or destruction. */
2649 finish_expr_stmt (init);
2651 /* If we're using __cxa_atexit, register a function that calls the
2652 destructor for the object. */
2653 if (flag_use_cxa_atexit)
2654 finish_expr_stmt (register_dtor_fn (decl));
2657 finish_expr_stmt (build_cleanup (decl));
2659 /* Finish the guard if-stmt, if necessary. */
2662 finish_then_clause (guard_if_stmt);
2663 finish_if_stmt (guard_if_stmt);
2666 /* Now that we're done with DECL we don't need to pretend to be a
2667 member of its class any longer. */
2668 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2669 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2672 /* Generate code to do the initialization or destruction of the decls in VARS,
2673 a TREE_LIST of VAR_DECL with static storage duration.
2674 Whether initialization or destruction is performed is specified by INITP. */
2677 do_static_initialization_or_destruction (tree vars, bool initp)
2679 tree node, init_if_stmt, cond;
2681 /* Build the outer if-stmt to check for initialization or destruction. */
2682 init_if_stmt = begin_if_stmt ();
2683 cond = initp ? integer_one_node : integer_zero_node;
2684 cond = cp_build_binary_op (EQ_EXPR,
2687 finish_if_stmt_cond (cond, init_if_stmt);
2691 tree decl = TREE_VALUE (node);
2692 tree priority_if_stmt;
2696 /* If we don't need a destructor, there's nothing to do. Avoid
2697 creating a possibly empty if-stmt. */
2698 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2700 node = TREE_CHAIN (node);
2704 /* Remember that we had an initialization or finalization at this
2706 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2707 pi = get_priority_info (priority);
2709 pi->initializations_p = 1;
2711 pi->destructions_p = 1;
2713 /* Conditionalize this initialization on being in the right priority
2714 and being initializing/finalizing appropriately. */
2715 priority_if_stmt = begin_if_stmt ();
2716 cond = cp_build_binary_op (EQ_EXPR,
2718 build_int_cst (NULL_TREE, priority));
2719 finish_if_stmt_cond (cond, priority_if_stmt);
2721 /* Process initializers with same priority. */
2723 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2724 node = TREE_CHAIN (node))
2725 /* Do one initialization or destruction. */
2726 one_static_initialization_or_destruction (TREE_VALUE (node),
2727 TREE_PURPOSE (node), initp);
2729 /* Finish up the priority if-stmt body. */
2730 finish_then_clause (priority_if_stmt);
2731 finish_if_stmt (priority_if_stmt);
2735 /* Finish up the init/destruct if-stmt body. */
2736 finish_then_clause (init_if_stmt);
2737 finish_if_stmt (init_if_stmt);
2740 /* VARS is a list of variables with static storage duration which may
2741 need initialization and/or finalization. Remove those variables
2742 that don't really need to be initialized or finalized, and return
2743 the resulting list. The order in which the variables appear in
2744 VARS is in reverse order of the order in which they should actually
2745 be initialized. The list we return is in the unreversed order;
2746 i.e., the first variable should be initialized first. */
2749 prune_vars_needing_no_initialization (tree *vars)
2752 tree result = NULL_TREE;
2757 tree decl = TREE_VALUE (t);
2758 tree init = TREE_PURPOSE (t);
2760 /* Deal gracefully with error. */
2761 if (decl == error_mark_node)
2763 var = &TREE_CHAIN (t);
2767 /* The only things that can be initialized are variables. */
2768 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2770 /* If this object is not defined, we don't need to do anything
2772 if (DECL_EXTERNAL (decl))
2774 var = &TREE_CHAIN (t);
2778 /* Also, if the initializer already contains errors, we can bail
2780 if (init && TREE_CODE (init) == TREE_LIST
2781 && value_member (error_mark_node, init))
2783 var = &TREE_CHAIN (t);
2787 /* This variable is going to need initialization and/or
2788 finalization, so we add it to the list. */
2789 *var = TREE_CHAIN (t);
2790 TREE_CHAIN (t) = result;
2797 /* Make sure we have told the back end about all the variables in
2801 write_out_vars (tree vars)
2805 for (v = vars; v; v = TREE_CHAIN (v))
2807 tree var = TREE_VALUE (v);
2808 if (!var_finalized_p (var))
2810 import_export_decl (var);
2811 rest_of_decl_compilation (var, 1, 1);
2816 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2817 (otherwise) that will initialize all global objects with static
2818 storage duration having the indicated PRIORITY. */
2821 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2830 input_location = *locus;
2831 #ifdef USE_MAPPED_LOCATION
2837 /* We use `I' to indicate initialization and `D' to indicate
2839 function_key = constructor_p ? 'I' : 'D';
2841 /* We emit the function lazily, to avoid generating empty
2842 global constructors and destructors. */
2845 /* For Objective-C++, we may need to initialize metadata found in this module.
2846 This must be done _before_ any other static initializations. */
2847 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2848 && constructor_p && objc_static_init_needed_p ())
2850 body = start_objects (function_key, priority);
2851 objc_generate_static_init_call (NULL_TREE);
2854 /* Call the static storage duration function with appropriate
2856 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2858 /* Calls to pure or const functions will expand to nothing. */
2859 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2862 body = start_objects (function_key, priority);
2864 arguments = tree_cons (NULL_TREE,
2865 build_int_cst (NULL_TREE, priority),
2867 arguments = tree_cons (NULL_TREE,
2868 build_int_cst (NULL_TREE, constructor_p),
2870 finish_expr_stmt (build_function_call (fndecl, arguments));
2874 /* Close out the function. */
2876 finish_objects (function_key, priority, body);
2879 /* Generate constructor and destructor functions for the priority
2883 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2885 location_t *locus = (location_t *) data;
2886 int priority = (int) n->key;
2887 priority_info pi = (priority_info) n->value;
2889 /* Generate the functions themselves, but only if they are really
2891 if (pi->initializations_p)
2892 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2893 if (pi->destructions_p)
2894 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2896 /* Keep iterating. */
2900 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2901 decls referenced from front-end specific constructs; it will be called
2902 only for language-specific tree nodes.
2904 Here we must deal with member pointers. */
2907 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2908 tree from ATTRIBUTE_UNUSED)
2912 switch (TREE_CODE (t))
2915 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2916 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2919 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2920 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2923 if (DECL_VTABLE_OR_VTT_P (t))
2925 /* The ABI requires that all virtual tables be emitted
2926 whenever one of them is. */
2928 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2930 vtbl = TREE_CHAIN (vtbl))
2931 mark_decl_referenced (vtbl);
2933 else if (DECL_CONTEXT (t)
2934 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2935 /* If we need a static variable in a function, then we
2936 need the containing function. */
2937 mark_decl_referenced (DECL_CONTEXT (t));
2946 /* Java requires that we be able to reference a local address for a
2947 method, and not be confused by PLT entries. If hidden aliases are
2948 supported, emit one for each java function that we've emitted. */
2951 build_java_method_aliases (void)
2953 struct cgraph_node *node;
2955 #ifndef HAVE_GAS_HIDDEN
2959 for (node = cgraph_nodes; node ; node = node->next)
2961 tree fndecl = node->decl;
2963 if (TREE_ASM_WRITTEN (fndecl)
2964 && DECL_CONTEXT (fndecl)
2965 && TYPE_P (DECL_CONTEXT (fndecl))
2966 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2967 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2969 /* Mangle the name in a predictable way; we need to reference
2970 this from a java compiled object file. */
2971 tree oid, nid, alias;
2975 oid = DECL_ASSEMBLER_NAME (fndecl);
2976 oname = IDENTIFIER_POINTER (oid);
2977 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
2978 nname = ACONCAT (("_ZGA", oname+2, NULL));
2979 nid = get_identifier (nname);
2981 alias = make_alias_for (fndecl, nid);
2982 TREE_PUBLIC (alias) = 1;
2983 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
2985 assemble_alias (alias, oid);
2990 /* This routine is called at the end of compilation.
2991 Its job is to create all the code needed to initialize and
2992 destroy the global aggregates. We do the destruction
2993 first, since that way we only need to reverse the decls once. */
2996 cp_write_global_declarations (void)
3002 unsigned ssdf_count = 0;
3006 locus = input_location;
3009 /* Bad parse errors. Just forget about it. */
3010 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3014 c_common_write_pch ();
3016 #ifdef USE_MAPPED_LOCATION
3019 /* Otherwise, GDB can get confused, because in only knows
3020 about source for LINENO-1 lines. */
3024 /* We now have to write out all the stuff we put off writing out.
3027 o Template specializations that we have not yet instantiated,
3028 but which are needed.
3029 o Initialization and destruction for non-local objects with
3030 static storage duration. (Local objects with static storage
3031 duration are initialized when their scope is first entered,
3032 and are cleaned up via atexit.)
3033 o Virtual function tables.
3035 All of these may cause others to be needed. For example,
3036 instantiating one function may cause another to be needed, and
3037 generating the initializer for an object may cause templates to be
3038 instantiated, etc., etc. */
3040 timevar_push (TV_VARCONST);
3042 emit_support_tinfos ();
3051 /* If there are templates that we've put off instantiating, do
3053 instantiate_pending_templates (retries);
3056 /* Write out virtual tables as required. Note that writing out
3057 the virtual table for a template class may cause the
3058 instantiation of members of that class. If we write out
3059 vtables then we remove the class from our list so we don't
3060 have to look at it again. */
3062 while (keyed_classes != NULL_TREE
3063 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3066 keyed_classes = TREE_CHAIN (keyed_classes);
3072 tree next = TREE_CHAIN (t);
3076 if (maybe_emit_vtables (TREE_VALUE (next)))
3079 TREE_CHAIN (t) = TREE_CHAIN (next);
3084 next = TREE_CHAIN (t);
3088 /* Write out needed type info variables. We have to be careful
3089 looping through unemitted decls, because emit_tinfo_decl may
3090 cause other variables to be needed. New elements will be
3091 appended, and we remove from the vector those that actually
3093 for (i = VEC_length (tree, unemitted_tinfo_decls);
3094 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3095 if (emit_tinfo_decl (t))
3098 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3101 /* The list of objects with static storage duration is built up
3102 in reverse order. We clear STATIC_AGGREGATES so that any new
3103 aggregates added during the initialization of these will be
3104 initialized in the correct order when we next come around the
3106 vars = prune_vars_needing_no_initialization (&static_aggregates);
3110 /* We need to start a new initialization function each time
3111 through the loop. That's because we need to know which
3112 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3113 isn't computed until a function is finished, and written
3114 out. That's a deficiency in the back end. When this is
3115 fixed, these initialization functions could all become
3116 inline, with resulting performance improvements. */
3119 /* Set the line and file, so that it is obviously not from
3121 input_location = locus;
3122 ssdf_body = start_static_storage_duration_function (ssdf_count);
3124 /* Make sure the back end knows about all the variables. */
3125 write_out_vars (vars);
3127 /* First generate code to do all the initializations. */
3129 do_static_initialization_or_destruction (vars, /*initp=*/true);
3131 /* Then, generate code to do all the destructions. Do these
3132 in reverse order so that the most recently constructed
3133 variable is the first destroyed. If we're using
3134 __cxa_atexit, then we don't need to do this; functions
3135 were registered at initialization time to destroy the
3137 if (!flag_use_cxa_atexit && vars)
3139 vars = nreverse (vars);
3140 do_static_initialization_or_destruction (vars, /*initp=*/false);
3145 /* Finish up the static storage duration function for this
3147 input_location = locus;
3148 finish_static_storage_duration_function (ssdf_body);
3150 /* All those initializations and finalizations might cause
3151 us to need more inline functions, more template
3152 instantiations, etc. */
3155 #ifdef USE_MAPPED_LOCATION
3162 /* Go through the set of inline functions whose bodies have not
3163 been emitted yet. If out-of-line copies of these functions
3164 are required, emit them. */
3165 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3167 /* Does it need synthesizing? */
3168 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3169 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3171 /* Even though we're already at the top-level, we push
3172 there again. That way, when we pop back a few lines
3173 hence, all of our state is restored. Otherwise,
3174 finish_function doesn't clean things up, and we end
3175 up with CURRENT_FUNCTION_DECL set. */
3176 push_to_top_level ();
3177 /* The decl's location will mark where it was first
3178 needed. Save that so synthesize method can indicate
3179 where it was needed from, in case of error */
3180 input_location = DECL_SOURCE_LOCATION (decl);
3181 synthesize_method (decl);
3182 pop_from_top_level ();
3186 if (!DECL_SAVED_TREE (decl))
3189 /* We lie to the back end, pretending that some functions
3190 are not defined when they really are. This keeps these
3191 functions from being put out unnecessarily. But, we must
3192 stop lying when the functions are referenced, or if they
3193 are not comdat since they need to be put out now. If
3194 DECL_INTERFACE_KNOWN, then we have already set
3195 DECL_EXTERNAL appropriately, so there's no need to check
3196 again, and we do not want to clear DECL_EXTERNAL if a
3197 previous call to import_export_decl set it.
3199 This is done in a separate for cycle, because if some
3200 deferred function is contained in another deferred
3201 function later in deferred_fns varray,
3202 rest_of_compilation would skip this function and we
3203 really cannot expand the same function twice. */
3204 import_export_decl (decl);
3205 if (DECL_NOT_REALLY_EXTERN (decl)
3206 && DECL_INITIAL (decl)
3207 && decl_needed_p (decl))
3208 DECL_EXTERNAL (decl) = 0;
3210 /* If we're going to need to write this function out, and
3211 there's already a body for it, create RTL for it now.
3212 (There might be no body if this is a method we haven't
3213 gotten around to synthesizing yet.) */
3214 if (!DECL_EXTERNAL (decl)
3215 && decl_needed_p (decl)
3216 && !TREE_ASM_WRITTEN (decl)
3217 && !cgraph_node (decl)->local.finalized)
3219 /* We will output the function; no longer consider it in this
3221 DECL_DEFER_OUTPUT (decl) = 0;
3222 /* Generate RTL for this function now that we know we
3224 expand_or_defer_fn (decl);
3225 /* If we're compiling -fsyntax-only pretend that this
3226 function has been written out so that we don't try to
3228 if (flag_syntax_only)
3229 TREE_ASM_WRITTEN (decl) = 1;
3234 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3237 /* Static data members are just like namespace-scope globals. */
3238 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3240 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3242 import_export_decl (decl);
3243 /* If this static data member is needed, provide it to the
3245 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3246 DECL_EXTERNAL (decl) = 0;
3248 if (VEC_length (tree, pending_statics) != 0
3249 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3250 VEC_length (tree, pending_statics)))
3257 /* All used inline functions must have a definition at this point. */
3258 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3260 if (/* Check online inline functions that were actually used. */
3261 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3262 /* If the definition actually was available here, then the
3263 fact that the function was not defined merely represents
3264 that for some reason (use of a template repository,
3265 #pragma interface, etc.) we decided not to emit the
3267 && !DECL_INITIAL (decl)
3268 /* An explicit instantiation can be used to specify
3269 that the body is in another unit. It will have
3270 already verified there was a definition. */
3271 && !DECL_EXPLICIT_INSTANTIATION (decl))
3273 warning (0, "inline function %q+D used but never defined", decl);
3274 /* Avoid a duplicate warning from check_global_declaration_1. */
3275 TREE_NO_WARNING (decl) = 1;
3279 /* We give C linkage to static constructors and destructors. */
3280 push_lang_context (lang_name_c);
3282 /* Generate initialization and destruction functions for all
3283 priorities for which they are required. */
3284 if (priority_info_map)
3285 splay_tree_foreach (priority_info_map,
3286 generate_ctor_and_dtor_functions_for_priority,
3288 else if (c_dialect_objc () && objc_static_init_needed_p ())
3289 /* If this is obj-c++ and we need a static init, call
3290 generate_ctor_or_dtor_function. */
3291 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3292 DEFAULT_INIT_PRIORITY, &locus);
3294 /* We're done with the splay-tree now. */
3295 if (priority_info_map)
3296 splay_tree_delete (priority_info_map);
3298 c_build_cdtor_fns ();
3300 /* Generate any missing aliases. */
3301 maybe_apply_pending_pragma_weaks ();
3303 /* We're done with static constructors, so we can go back to "C++"
3305 pop_lang_context ();
3307 cgraph_finalize_compilation_unit ();
3310 /* Now, issue warnings about static, but not defined, functions,
3311 etc., and emit debugging information. */
3312 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3313 if (VEC_length (tree, pending_statics) != 0)
3315 check_global_declarations (VEC_address (tree, pending_statics),
3316 VEC_length (tree, pending_statics));
3317 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3318 VEC_length (tree, pending_statics));
3321 /* Generate hidden aliases for Java. */
3322 build_java_method_aliases ();
3326 /* The entire file is now complete. If requested, dump everything
3330 FILE *stream = dump_begin (TDI_tu, &flags);
3334 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3335 dump_end (TDI_tu, stream);
3339 timevar_pop (TV_VARCONST);
3341 if (flag_detailed_statistics)
3343 dump_tree_statistics ();
3344 dump_time_statistics ();
3346 input_location = locus;
3348 #ifdef ENABLE_CHECKING
3349 validate_conversion_obstack ();
3350 #endif /* ENABLE_CHECKING */
3353 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3354 function to call in parse-tree form; it has not yet been
3355 semantically analyzed. ARGS are the arguments to the function.
3356 They have already been semantically analyzed. */
3359 build_offset_ref_call_from_tree (tree fn, tree args)
3368 object = TREE_OPERAND (fn, 0);
3370 if (processing_template_decl)
3372 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3373 || TREE_CODE (fn) == MEMBER_REF);
3374 if (type_dependent_expression_p (fn)
3375 || any_type_dependent_arguments_p (args))
3376 return build_nt_call_list (fn, args);
3378 /* Transform the arguments and add the implicit "this"
3379 parameter. That must be done before the FN is transformed
3380 because we depend on the form of FN. */
3381 args = build_non_dependent_args (args);
3382 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3383 object = build_unary_op (ADDR_EXPR, object, 0);
3384 object = build_non_dependent_expr (object);
3385 args = tree_cons (NULL_TREE, object, args);
3386 /* Now that the arguments are done, transform FN. */
3387 fn = build_non_dependent_expr (fn);
3390 /* A qualified name corresponding to a bound pointer-to-member is
3391 represented as an OFFSET_REF:
3393 struct B { void g(); };
3395 void B::g() { (this->*p)(); } */
3396 if (TREE_CODE (fn) == OFFSET_REF)
3398 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3399 fn = TREE_OPERAND (fn, 1);
3400 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3401 args = tree_cons (NULL_TREE, object_addr, args);
3404 expr = build_function_call (fn, args);
3405 if (processing_template_decl && expr != error_mark_node)
3406 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3412 check_default_args (tree x)
3414 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3415 bool saw_def = false;
3416 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3417 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3419 if (TREE_PURPOSE (arg))
3423 error ("default argument missing for parameter %P of %q+#D", i, x);
3424 TREE_PURPOSE (arg) = error_mark_node;
3429 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3430 If DECL is a specialization or implicitly declared class member,
3431 generate the actual definition. */
3434 mark_used (tree decl)
3436 HOST_WIDE_INT saved_processing_template_decl = 0;
3438 /* If DECL is a BASELINK for a single function, then treat it just
3439 like the DECL for the function. Otherwise, if the BASELINK is
3440 for an overloaded function, we don't know which function was
3441 actually used until after overload resolution. */
3442 if (TREE_CODE (decl) == BASELINK)
3444 decl = BASELINK_FUNCTIONS (decl);
3445 if (really_overloaded_fn (decl))
3447 decl = OVL_CURRENT (decl);
3450 TREE_USED (decl) = 1;
3451 if (DECL_CLONED_FUNCTION_P (decl))
3452 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3453 /* If we don't need a value, then we don't need to synthesize DECL. */
3454 if (skip_evaluation)
3456 /* Normally, we can wait until instantiation-time to synthesize
3457 DECL. However, if DECL is a static data member initialized with
3458 a constant, we need the value right now because a reference to
3459 such a data member is not value-dependent. */
3460 if (TREE_CODE (decl) == VAR_DECL
3461 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3462 && DECL_CLASS_SCOPE_P (decl))
3464 /* Don't try to instantiate members of dependent types. We
3465 cannot just use dependent_type_p here because this function
3466 may be called from fold_non_dependent_expr, and then we may
3467 see dependent types, even though processing_template_decl
3469 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3470 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3472 /* Pretend that we are not in a template, even if we are, so
3473 that the static data member initializer will be processed. */
3474 saved_processing_template_decl = processing_template_decl;
3475 processing_template_decl = 0;
3478 if (processing_template_decl)
3481 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3482 && !TREE_ASM_WRITTEN (decl))
3483 /* Remember it, so we can check it was defined. */
3485 if (DECL_DEFERRED_FN (decl))
3488 /* Remember the current location for a function we will end up
3489 synthesizing. Then we can inform the user where it was
3490 required in the case of error. */
3491 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3492 && !DECL_THUNK_P (decl))
3493 DECL_SOURCE_LOCATION (decl) = input_location;
3495 note_vague_linkage_fn (decl);
3498 assemble_external (decl);
3500 /* Is it a synthesized method that needs to be synthesized? */
3501 if (TREE_CODE (decl) == FUNCTION_DECL
3502 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3503 && DECL_ARTIFICIAL (decl)
3504 && !DECL_THUNK_P (decl)
3505 && ! DECL_INITIAL (decl)
3506 /* Kludge: don't synthesize for default args. Unfortunately this
3507 rules out initializers of namespace-scoped objects too, but
3508 it's sort-of ok if the implicit ctor or dtor decl keeps
3509 pointing to the class location. */
3510 && current_function_decl)
3512 synthesize_method (decl);
3513 /* If we've already synthesized the method we don't need to
3514 do the instantiation test below. */
3516 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3517 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3518 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3519 || (TREE_CODE (decl) == FUNCTION_DECL
3520 && DECL_INLINE (DECL_TEMPLATE_RESULT
3521 (template_for_substitution (decl))))
3522 /* We need to instantiate static data members so that there
3523 initializers are available in integral constant
3525 || (TREE_CODE (decl) == VAR_DECL
3526 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3527 /* If this is a function or variable that is an instance of some
3528 template, we now know that we will need to actually do the
3529 instantiation. We check that DECL is not an explicit
3530 instantiation because that is not checked in instantiate_decl.
3532 We put off instantiating functions in order to improve compile
3533 times. Maintaining a stack of active functions is expensive,
3534 and the inliner knows to instantiate any functions it might
3535 need. Therefore, we always try to defer instantiation. */
3536 instantiate_decl (decl, /*defer_ok=*/true,
3537 /*expl_inst_class_mem_p=*/false);
3539 processing_template_decl = saved_processing_template_decl;
3542 #include "gt-cp-decl2.h"