1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* Process declarations and symbol lookup for C++ front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
32 #include "coretypes.h"
47 #include "tree-mudflap.h"
49 #include "tree-inline.h"
51 #include "tree-dump.h"
54 extern cpp_reader *parse_in;
56 /* This structure contains information about the initializations
57 and/or destructions required for a particular priority level. */
58 typedef struct priority_info_s {
59 /* Nonzero if there have been any initializations at this priority
60 throughout the translation unit. */
61 int initializations_p;
62 /* Nonzero if there have been any destructions at this priority
63 throughout the translation unit. */
67 static void mark_vtable_entries (tree);
68 static bool maybe_emit_vtables (tree);
69 static bool acceptable_java_type (tree);
70 static tree start_objects (int, int);
71 static void finish_objects (int, int, tree);
72 static tree start_static_storage_duration_function (unsigned);
73 static void finish_static_storage_duration_function (tree);
74 static priority_info get_priority_info (int);
75 static void do_static_initialization_or_destruction (tree, bool);
76 static void one_static_initialization_or_destruction (tree, tree, bool);
77 static void generate_ctor_or_dtor_function (bool, int, location_t *);
78 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
80 static tree prune_vars_needing_no_initialization (tree *);
81 static void write_out_vars (tree);
82 static void import_export_class (tree);
83 static tree get_guard_bits (tree);
84 static void determine_visibility_from_class (tree, tree);
86 /* A list of static class variables. This is needed, because a
87 static class variable can be declared inside the class without
88 an initializer, and then initialized, statically, outside the class. */
89 static GTY(()) VEC(tree,gc) *pending_statics;
91 /* A list of functions which were declared inline, but which we
92 may need to emit outline anyway. */
93 static GTY(()) VEC(tree,gc) *deferred_fns;
95 /* Nonzero if we're done parsing and into end-of-file activities. */
101 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
102 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
103 that apply to the function). */
106 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
111 if (fntype == error_mark_node || ctype == error_mark_node)
112 return error_mark_node;
114 type_quals = quals & ~TYPE_QUAL_RESTRICT;
115 ctype = cp_build_qualified_type (ctype, type_quals);
116 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
117 (TREE_CODE (fntype) == METHOD_TYPE
118 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
119 : TYPE_ARG_TYPES (fntype)));
120 raises = TYPE_RAISES_EXCEPTIONS (fntype);
122 fntype = build_exception_variant (fntype, raises);
127 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
131 cp_build_parm_decl (tree name, tree type)
133 tree parm = build_decl (PARM_DECL, name, type);
134 /* DECL_ARG_TYPE is only used by the back end and the back end never
136 if (!processing_template_decl)
137 DECL_ARG_TYPE (parm) = type_passed_as (type);
139 /* If the type is a pack expansion, then we have a function
141 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
142 FUNCTION_PARAMETER_PACK_P (parm) = 1;
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name, tree type)
153 tree parm = cp_build_parm_decl (name, type);
154 DECL_ARTIFICIAL (parm) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn)
177 tree basetype, arg_types, parms, parm, fntype;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
194 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
195 basetype = TREE_TYPE (TREE_VALUE (arg_types));
196 arg_types = TREE_CHAIN (arg_types);
198 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm) = parms;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
213 DECL_HAS_VTT_PARM_P (fn) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
218 TREE_CHAIN (parm) = parms;
220 arg_types = hash_tree_chain (integer_type_node, arg_types);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
225 /* And rebuild the function type. */
226 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
229 fntype = build_exception_variant (fntype,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
231 TREE_TYPE (fn) = fntype;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype, tree function, enum overload_flags flags)
260 tree fn_name = DECL_NAME (function);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function, lang_cplusplus);
266 if (fn_name == NULL_TREE)
268 error ("name missing for member function");
269 fn_name = get_identifier ("<anonymous>");
270 DECL_NAME (function) = fn_name;
273 DECL_CONTEXT (function) = ctype;
275 if (flags == DTOR_FLAG)
276 DECL_DESTRUCTOR_P (function) = 1;
278 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
279 maybe_retrofit_in_chrg (function);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr, tree index_exp)
290 tree orig_array_expr = array_expr;
291 tree orig_index_exp = index_exp;
293 if (error_operand_p (array_expr) || error_operand_p (index_exp))
294 return error_mark_node;
296 if (processing_template_decl)
298 if (type_dependent_expression_p (array_expr)
299 || type_dependent_expression_p (index_exp))
300 return build_min_nt (ARRAY_REF, array_expr, index_exp,
301 NULL_TREE, NULL_TREE);
302 array_expr = build_non_dependent_expr (array_expr);
303 index_exp = build_non_dependent_expr (index_exp);
306 type = TREE_TYPE (array_expr);
308 type = non_reference (type);
310 /* If they have an `operator[]', use that. */
311 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type) == ARRAY_TYPE)
326 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
328 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
331 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
333 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
335 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
338 if ((p1 && i2) && (i1 && p2))
339 error ("ambiguous conversion for array subscript");
342 array_expr = p1, index_exp = i2;
344 array_expr = p2, index_exp = i1;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type, TREE_TYPE (index_exp));
349 return error_mark_node;
352 if (array_expr == error_mark_node || index_exp == error_mark_node)
353 error ("ambiguous conversion for array subscript");
355 expr = build_array_ref (array_expr, index_exp);
357 if (processing_template_decl && expr != error_mark_node)
358 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
359 NULL_TREE, NULL_TREE);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
375 if (exp == error_mark_node)
378 if (processing_template_decl)
380 t = build_min (DELETE_EXPR, void_type_node, exp, size);
381 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
382 DELETE_EXPR_USE_VEC (t) = doing_vec;
383 TREE_SIDE_EFFECTS (t) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
390 warning (0, "deleting array %q#D", exp);
392 t = build_expr_type_conversion (WANT_POINTER, exp, true);
394 if (t == NULL_TREE || t == error_mark_node)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node;
401 type = TREE_TYPE (t);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
416 warning (0, "deleting %qT is undefined", type);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t))
422 return build1 (NOP_EXPR, void_type_node, t);
425 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
426 sfk_deleting_destructor,
429 return build_delete (type, t, sfk_deleting_destructor,
430 LOOKUP_NORMAL, use_global_delete);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl)
441 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
442 decl = DECL_TEMPLATE_RESULT (tmpl);
444 if (TREE_CODE (decl) == FUNCTION_DECL
445 || (TREE_CODE (decl) == TYPE_DECL
446 && IS_AGGR_TYPE (TREE_TYPE (decl))))
448 /* The parser rejects template declarations in local classes. */
449 gcc_assert (!current_function_decl);
450 /* The parser rejects any use of virtual in a function template. */
451 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
452 && DECL_VIRTUAL_P (decl)));
454 /* The debug-information generating code doesn't know what to do
455 with member templates. */
456 DECL_IGNORED_P (tmpl) = 1;
459 error ("template declaration of %q#D", decl);
462 /* Return true iff TYPE is a valid Java parameter or return type. */
465 acceptable_java_type (tree type)
467 if (type == error_mark_node)
470 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
472 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
474 type = TREE_TYPE (type);
475 if (TREE_CODE (type) == RECORD_TYPE)
478 if (! TYPE_FOR_JAVA (type))
480 if (! CLASSTYPE_TEMPLATE_INFO (type))
482 args = CLASSTYPE_TI_ARGS (type);
483 i = TREE_VEC_LENGTH (args);
486 type = TREE_VEC_ELT (args, i);
487 if (TREE_CODE (type) == POINTER_TYPE)
488 type = TREE_TYPE (type);
489 if (! TYPE_FOR_JAVA (type))
498 /* For a METHOD in a Java class CTYPE, return true if
499 the parameter and return types are valid Java types.
500 Otherwise, print appropriate error messages, and return false. */
503 check_java_method (tree method)
506 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
507 tree ret_type = TREE_TYPE (TREE_TYPE (method));
509 if (!acceptable_java_type (ret_type))
511 error ("Java method %qD has non-Java return type %qT",
516 arg_types = TREE_CHAIN (arg_types);
517 if (DECL_HAS_IN_CHARGE_PARM_P (method))
518 arg_types = TREE_CHAIN (arg_types);
519 if (DECL_HAS_VTT_PARM_P (method))
520 arg_types = TREE_CHAIN (arg_types);
522 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
524 tree type = TREE_VALUE (arg_types);
525 if (!acceptable_java_type (type))
527 if (type != error_mark_node)
528 error ("Java method %qD has non-Java parameter type %qT",
536 /* Sanity check: report error if this function FUNCTION is not
537 really a member of the class (CTYPE) it is supposed to belong to.
538 TEMPLATE_PARMS is used to specify the template parameters of a member
539 template passed as FUNCTION_DECL. If the member template is passed as a
540 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
541 from the declaration. If the function is not a function template, it
543 It returns the original declaration for the function, NULL_TREE if
544 no declaration was found, error_mark_node if an error was emitted. */
547 check_classfn (tree ctype, tree function, tree template_parms)
553 if (DECL_USE_TEMPLATE (function)
554 && !(TREE_CODE (function) == TEMPLATE_DECL
555 && DECL_TEMPLATE_SPECIALIZATION (function))
556 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
557 /* Since this is a specialization of a member template,
558 we're not going to find the declaration in the class.
561 struct S { template <typename T> void f(T); };
562 template <> void S::f(int);
564 we're not going to find `S::f(int)', but there's no
565 reason we should, either. We let our callers know we didn't
566 find the method, but we don't complain. */
569 /* Basic sanity check: for a template function, the template parameters
570 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
571 if (TREE_CODE (function) == TEMPLATE_DECL)
573 gcc_assert (!template_parms
574 || comp_template_parms (template_parms,
575 DECL_TEMPLATE_PARMS (function)));
576 template_parms = DECL_TEMPLATE_PARMS (function);
579 /* OK, is this a definition of a member template? */
580 is_template = (template_parms != NULL_TREE);
582 /* We must enter the scope here, because conversion operators are
583 named by target type, and type equivalence relies on typenames
584 resolving within the scope of CTYPE. */
585 pushed_scope = push_scope (ctype);
586 ix = class_method_index_for_fn (complete_type (ctype), function);
589 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
590 tree fndecls, fndecl = 0;
592 const char *format = NULL;
594 for (fndecls = VEC_index (tree, methods, ix);
595 fndecls; fndecls = OVL_NEXT (fndecls))
599 fndecl = OVL_CURRENT (fndecls);
600 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
601 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
603 /* We cannot simply call decls_match because this doesn't
604 work for static member functions that are pretending to
605 be methods, and because the name may have been changed by
608 /* Get rid of the this parameter on functions that become
610 if (DECL_STATIC_FUNCTION_P (fndecl)
611 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
612 p1 = TREE_CHAIN (p1);
614 /* A member template definition only matches a member template
616 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
619 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
620 TREE_TYPE (TREE_TYPE (fndecl)))
621 && compparms (p1, p2)
623 || comp_template_parms (template_parms,
624 DECL_TEMPLATE_PARMS (fndecl)))
625 && (DECL_TEMPLATE_SPECIALIZATION (function)
626 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
627 && (!DECL_TEMPLATE_SPECIALIZATION (function)
628 || (DECL_TI_TEMPLATE (function)
629 == DECL_TI_TEMPLATE (fndecl))))
635 pop_scope (pushed_scope);
636 return OVL_CURRENT (fndecls);
639 error ("prototype for %q#D does not match any in class %qT",
641 is_conv_op = DECL_CONV_FN_P (fndecl);
644 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
645 fndecls = VEC_index (tree, methods, ix);
648 fndecl = OVL_CURRENT (fndecls);
649 fndecls = OVL_NEXT (fndecls);
651 if (!fndecls && is_conv_op)
653 if (VEC_length (tree, methods) > (size_t) ++ix)
655 fndecls = VEC_index (tree, methods, ix);
656 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
668 format = N_("candidates are: %+#D");
670 format = N_("candidate is: %+#D");
671 error (format, fndecl);
674 else if (!COMPLETE_TYPE_P (ctype))
675 cxx_incomplete_type_error (function, ctype);
677 error ("no %q#D member function declared in class %qT",
681 pop_scope (pushed_scope);
682 return error_mark_node;
685 /* DECL is a function with vague linkage. Remember it so that at the
686 end of the translation unit we can decide whether or not to emit
690 note_vague_linkage_fn (tree decl)
692 if (!DECL_DEFERRED_FN (decl))
694 DECL_DEFERRED_FN (decl) = 1;
695 DECL_DEFER_OUTPUT (decl) = 1;
696 VEC_safe_push (tree, gc, deferred_fns, decl);
700 /* We have just processed the DECL, which is a static data member.
701 The other parameters are as for cp_finish_decl. */
704 finish_static_data_member_decl (tree decl,
705 tree init, bool init_const_expr_p,
709 DECL_CONTEXT (decl) = current_class_type;
711 /* We cannot call pushdecl here, because that would fill in the
712 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
713 the right thing, namely, to put this decl out straight away. */
715 if (! processing_template_decl)
716 VEC_safe_push (tree, gc, pending_statics, decl);
718 if (LOCAL_CLASS_P (current_class_type))
719 pedwarn ("local class %q#T shall not have static data member %q#D",
720 current_class_type, decl);
722 /* Static consts need not be initialized in the class definition. */
723 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
725 static int explained = 0;
727 error ("initializer invalid for static member with constructor");
730 error ("(an out of class initialization is required)");
735 /* Force the compiler to know when an uninitialized static const
736 member is being used. */
737 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
738 TREE_USED (decl) = 1;
739 DECL_INITIAL (decl) = init;
740 DECL_IN_AGGR_P (decl) = 1;
742 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
745 /* DECLARATOR and DECLSPECS correspond to a class member. The other
746 parameters are as for cp_finish_decl. Return the DECL for the
747 class member declared. */
750 grokfield (const cp_declarator *declarator,
751 cp_decl_specifier_seq *declspecs,
752 tree init, bool init_const_expr_p,
757 const char *asmspec = 0;
758 int flags = LOOKUP_ONLYCONVERTING;
761 && TREE_CODE (init) == TREE_LIST
762 && TREE_VALUE (init) == error_mark_node
763 && TREE_CHAIN (init) == NULL_TREE)
766 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
767 if (! value || error_operand_p (value))
768 /* friend or constructor went bad. */
769 return error_mark_node;
771 if (TREE_CODE (value) == TYPE_DECL && init)
773 error ("typedef %qD is initialized (use __typeof__ instead)", value);
777 /* Pass friendly classes back. */
778 if (value == void_type_node)
781 /* Pass friend decls back. */
782 if ((TREE_CODE (value) == FUNCTION_DECL
783 || TREE_CODE (value) == TEMPLATE_DECL)
784 && DECL_CONTEXT (value) != current_class_type)
787 if (DECL_NAME (value) != NULL_TREE
788 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
789 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
790 error ("member %qD conflicts with virtual function table field name",
793 /* Stash away type declarations. */
794 if (TREE_CODE (value) == TYPE_DECL)
796 DECL_NONLOCAL (value) = 1;
797 DECL_CONTEXT (value) = current_class_type;
799 if (processing_template_decl)
800 value = push_template_decl (value);
804 /* Avoid storing attributes in template parameters:
805 tsubst is not ready to handle them. */
806 tree type = TREE_TYPE (value);
807 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
808 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
809 sorry ("applying attributes to template parameters is not implemented");
811 cplus_decl_attributes (&value, attrlist, 0);
817 if (DECL_IN_AGGR_P (value))
819 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
820 return void_type_node;
823 if (asmspec_tree && asmspec_tree != error_mark_node)
824 asmspec = TREE_STRING_POINTER (asmspec_tree);
828 if (TREE_CODE (value) == FUNCTION_DECL)
830 /* Initializers for functions are rejected early in the parser.
831 If we get here, it must be a pure specifier for a method. */
832 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
834 gcc_assert (error_operand_p (init) || integer_zerop (init));
835 DECL_PURE_VIRTUAL_P (value) = 1;
839 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
840 error ("initializer specified for static member function %qD",
844 else if (pedantic && TREE_CODE (value) != VAR_DECL)
845 /* Already complained in grokdeclarator. */
847 else if (!processing_template_decl)
849 if (TREE_CODE (init) == CONSTRUCTOR)
850 init = digest_init (TREE_TYPE (value), init);
852 init = integral_constant_value (init);
854 if (init != error_mark_node && !TREE_CONSTANT (init))
856 /* We can allow references to things that are effectively
857 static, since references are initialized with the
859 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
860 || (TREE_STATIC (init) == 0
861 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
863 error ("field initializer is not constant");
864 init = error_mark_node;
870 if (processing_template_decl
871 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
873 value = push_template_decl (value);
874 if (error_operand_p (value))
875 return error_mark_node;
879 cplus_decl_attributes (&value, attrlist, 0);
881 switch (TREE_CODE (value))
884 finish_static_data_member_decl (value, init, init_const_expr_p,
885 asmspec_tree, flags);
890 error ("%<asm%> specifiers are not permitted on non-static data members");
891 if (DECL_INITIAL (value) == error_mark_node)
892 init = error_mark_node;
893 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
895 DECL_INITIAL (value) = init;
896 DECL_IN_AGGR_P (value) = 1;
901 set_user_assembler_name (value, asmspec);
903 cp_finish_decl (value,
905 /*init_const_expr_p=*/false,
906 asmspec_tree, flags);
908 /* Pass friends back this way. */
909 if (DECL_FRIEND_P (value))
910 return void_type_node;
912 DECL_IN_AGGR_P (value) = 1;
921 /* Like `grokfield', but for bitfields.
922 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
925 grokbitfield (const cp_declarator *declarator,
926 cp_decl_specifier_seq *declspecs, tree width)
928 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
930 if (value == error_mark_node)
931 return NULL_TREE; /* friends went bad. */
933 /* Pass friendly classes back. */
934 if (TREE_CODE (value) == VOID_TYPE)
935 return void_type_node;
937 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
938 && (POINTER_TYPE_P (value)
939 || !dependent_type_p (TREE_TYPE (value))))
941 error ("bit-field %qD with non-integral type", value);
942 return error_mark_node;
945 if (TREE_CODE (value) == TYPE_DECL)
947 error ("cannot declare %qD to be a bit-field type", value);
951 /* Usually, finish_struct_1 catches bitfields with invalid types.
952 But, in the case of bitfields with function type, we confuse
953 ourselves into thinking they are member functions, so we must
955 if (TREE_CODE (value) == FUNCTION_DECL)
957 error ("cannot declare bit-field %qD with function type",
962 if (DECL_IN_AGGR_P (value))
964 error ("%qD is already defined in the class %qT", value,
965 DECL_CONTEXT (value));
966 return void_type_node;
969 if (TREE_STATIC (value))
971 error ("static member %qD cannot be a bit-field", value);
974 finish_decl (value, NULL_TREE, NULL_TREE);
976 if (width != error_mark_node)
978 constant_expression_warning (width);
979 DECL_INITIAL (value) = width;
980 SET_DECL_C_BIT_FIELD (value);
983 DECL_IN_AGGR_P (value) = 1;
989 cplus_decl_attributes (tree *decl, tree attributes, int flags)
991 if (*decl == NULL_TREE || *decl == void_type_node
992 || *decl == error_mark_node)
995 if (TREE_CODE (*decl) == TEMPLATE_DECL)
996 decl = &DECL_TEMPLATE_RESULT (*decl);
998 decl_attributes (decl, attributes, flags);
1000 if (TREE_CODE (*decl) == TYPE_DECL)
1001 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1004 /* Walks through the namespace- or function-scope anonymous union
1005 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1006 Returns one of the fields for use in the mangled name. */
1009 build_anon_union_vars (tree type, tree object)
1011 tree main_decl = NULL_TREE;
1014 /* Rather than write the code to handle the non-union case,
1015 just give an error. */
1016 if (TREE_CODE (type) != UNION_TYPE)
1017 error ("anonymous struct not inside named type");
1019 for (field = TYPE_FIELDS (type);
1021 field = TREE_CHAIN (field))
1026 if (DECL_ARTIFICIAL (field))
1028 if (TREE_CODE (field) != FIELD_DECL)
1030 pedwarn ("%q+#D invalid; an anonymous union can only "
1031 "have non-static data members", field);
1035 if (TREE_PRIVATE (field))
1036 pedwarn ("private member %q+#D in anonymous union", field);
1037 else if (TREE_PROTECTED (field))
1038 pedwarn ("protected member %q+#D in anonymous union", field);
1040 if (processing_template_decl)
1041 ref = build_min_nt (COMPONENT_REF, object,
1042 DECL_NAME (field), NULL_TREE);
1044 ref = build_class_member_access_expr (object, field, NULL_TREE,
1047 if (DECL_NAME (field))
1051 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1052 DECL_ANON_UNION_VAR_P (decl) = 1;
1054 base = get_base_address (object);
1055 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1056 TREE_STATIC (decl) = TREE_STATIC (base);
1057 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1059 SET_DECL_VALUE_EXPR (decl, ref);
1060 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1062 decl = pushdecl (decl);
1064 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1065 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1069 if (main_decl == NULL_TREE)
1076 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1077 anonymous union, then all members must be laid out together. PUBLIC_P
1078 is nonzero if this union is not declared static. */
1081 finish_anon_union (tree anon_union_decl)
1087 if (anon_union_decl == error_mark_node)
1090 type = TREE_TYPE (anon_union_decl);
1091 public_p = TREE_PUBLIC (anon_union_decl);
1093 /* The VAR_DECL's context is the same as the TYPE's context. */
1094 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1096 if (TYPE_FIELDS (type) == NULL_TREE)
1101 error ("namespace-scope anonymous aggregates must be static");
1105 main_decl = build_anon_union_vars (type, anon_union_decl);
1106 if (main_decl == error_mark_node)
1108 if (main_decl == NULL_TREE)
1110 warning (0, "anonymous union with no members");
1114 if (!processing_template_decl)
1116 /* Use main_decl to set the mangled name. */
1117 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1118 mangle_decl (anon_union_decl);
1119 DECL_NAME (anon_union_decl) = NULL_TREE;
1122 pushdecl (anon_union_decl);
1123 if (building_stmt_tree ()
1124 && at_function_scope_p ())
1125 add_decl_expr (anon_union_decl);
1126 else if (!processing_template_decl)
1127 rest_of_decl_compilation (anon_union_decl,
1128 toplevel_bindings_p (), at_eof);
1131 /* Auxiliary functions to make type signatures for
1132 `operator new' and `operator delete' correspond to
1133 what compiler will be expecting. */
1136 coerce_new_type (tree type)
1139 tree args = TYPE_ARG_TYPES (type);
1141 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1143 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1146 error ("%<operator new%> must return type %qT", ptr_type_node);
1149 if (!args || args == void_list_node
1150 || !same_type_p (TREE_VALUE (args), size_type_node))
1153 if (args && args != void_list_node)
1154 args = TREE_CHAIN (args);
1155 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1156 "as first parameter", size_type_node);
1161 args = tree_cons (NULL_TREE, size_type_node, args);
1164 type = build_exception_variant
1165 (build_function_type (ptr_type_node, args),
1166 TYPE_RAISES_EXCEPTIONS (type));
1174 coerce_delete_type (tree type)
1177 tree args = TYPE_ARG_TYPES (type);
1179 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1181 if (!same_type_p (TREE_TYPE (type), void_type_node))
1184 error ("%<operator delete%> must return type %qT", void_type_node);
1187 if (!args || args == void_list_node
1188 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1191 if (args && args != void_list_node)
1192 args = TREE_CHAIN (args);
1193 error ("%<operator delete%> takes type %qT as first parameter",
1199 args = tree_cons (NULL_TREE, ptr_type_node, args);
1202 type = build_exception_variant
1203 (build_function_type (void_type_node, args),
1204 TYPE_RAISES_EXCEPTIONS (type));
1213 mark_vtable_entries (tree decl)
1216 unsigned HOST_WIDE_INT idx;
1218 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1223 STRIP_NOPS (fnaddr);
1225 if (TREE_CODE (fnaddr) != ADDR_EXPR
1226 && TREE_CODE (fnaddr) != FDESC_EXPR)
1227 /* This entry is an offset: a virtual base class offset, a
1228 virtual call offset, an RTTI offset, etc. */
1231 fn = TREE_OPERAND (fnaddr, 0);
1232 TREE_ADDRESSABLE (fn) = 1;
1233 /* When we don't have vcall offsets, we output thunks whenever
1234 we output the vtables that contain them. With vcall offsets,
1235 we know all the thunks we'll need when we emit a virtual
1236 function, so we emit the thunks there instead. */
1237 if (DECL_THUNK_P (fn))
1238 use_thunk (fn, /*emit_p=*/0);
1243 /* Set DECL up to have the closest approximation of "initialized common"
1244 linkage available. */
1247 comdat_linkage (tree decl)
1250 make_decl_one_only (decl);
1251 else if (TREE_CODE (decl) == FUNCTION_DECL
1252 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1253 /* We can just emit function and compiler-generated variables
1254 statically; having multiple copies is (for the most part) only
1257 There are two correctness issues, however: the address of a
1258 template instantiation with external linkage should be the
1259 same, independent of what translation unit asks for the
1260 address, and this will not hold when we emit multiple copies of
1261 the function. However, there's little else we can do.
1263 Also, by default, the typeinfo implementation assumes that
1264 there will be only one copy of the string used as the name for
1265 each type. Therefore, if weak symbols are unavailable, the
1266 run-time library should perform a more conservative check; it
1267 should perform a string comparison, rather than an address
1269 TREE_PUBLIC (decl) = 0;
1272 /* Static data member template instantiations, however, cannot
1273 have multiple copies. */
1274 if (DECL_INITIAL (decl) == 0
1275 || DECL_INITIAL (decl) == error_mark_node)
1276 DECL_COMMON (decl) = 1;
1277 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1279 DECL_COMMON (decl) = 1;
1280 DECL_INITIAL (decl) = error_mark_node;
1282 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1284 /* We can't do anything useful; leave vars for explicit
1286 DECL_EXTERNAL (decl) = 1;
1287 DECL_NOT_REALLY_EXTERN (decl) = 0;
1291 if (DECL_LANG_SPECIFIC (decl))
1292 DECL_COMDAT (decl) = 1;
1295 /* For win32 we also want to put explicit instantiations in
1296 linkonce sections, so that they will be merged with implicit
1297 instantiations; otherwise we get duplicate symbol errors.
1298 For Darwin we do not want explicit instantiations to be
1302 maybe_make_one_only (tree decl)
1304 /* We used to say that this was not necessary on targets that support weak
1305 symbols, because the implicit instantiations will defer to the explicit
1306 one. However, that's not actually the case in SVR4; a strong definition
1307 after a weak one is an error. Also, not making explicit
1308 instantiations one_only means that we can end up with two copies of
1309 some template instantiations. */
1313 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1314 we can get away with not emitting them if they aren't used. We need
1315 to for variables so that cp_finish_decl will update their linkage,
1316 because their DECL_INITIAL may not have been set properly yet. */
1318 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1319 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1320 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1322 make_decl_one_only (decl);
1324 if (TREE_CODE (decl) == VAR_DECL)
1326 DECL_COMDAT (decl) = 1;
1327 /* Mark it needed so we don't forget to emit it. */
1328 mark_decl_referenced (decl);
1333 /* Determine whether or not we want to specifically import or export CTYPE,
1334 using various heuristics. */
1337 import_export_class (tree ctype)
1339 /* -1 for imported, 1 for exported. */
1340 int import_export = 0;
1342 /* It only makes sense to call this function at EOF. The reason is
1343 that this function looks at whether or not the first non-inline
1344 non-abstract virtual member function has been defined in this
1345 translation unit. But, we can't possibly know that until we've
1346 seen the entire translation unit. */
1347 gcc_assert (at_eof);
1349 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1352 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1353 we will have CLASSTYPE_INTERFACE_ONLY set but not
1354 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1355 heuristic because someone will supply a #pragma implementation
1356 elsewhere, and deducing it here would produce a conflict. */
1357 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1360 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1362 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1364 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1365 && !flag_implicit_templates)
1366 /* For a template class, without -fimplicit-templates, check the
1367 repository. If the virtual table is assigned to this
1368 translation unit, then export the class; otherwise, import
1370 import_export = repo_export_class_p (ctype) ? 1 : -1;
1371 else if (TYPE_POLYMORPHIC_P (ctype))
1373 /* The ABI specifies that the virtual table and associated
1374 information are emitted with the key method, if any. */
1375 tree method = CLASSTYPE_KEY_METHOD (ctype);
1376 /* If weak symbol support is not available, then we must be
1377 careful not to emit the vtable when the key function is
1378 inline. An inline function can be defined in multiple
1379 translation units. If we were to emit the vtable in each
1380 translation unit containing a definition, we would get
1381 multiple definition errors at link-time. */
1382 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1383 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1386 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1387 a definition anywhere else. */
1388 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1391 /* Allow back ends the chance to overrule the decision. */
1392 if (targetm.cxx.import_export_class)
1393 import_export = targetm.cxx.import_export_class (ctype, import_export);
1397 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1398 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1402 /* Return true if VAR has already been provided to the back end; in that
1403 case VAR should not be modified further by the front end. */
1405 var_finalized_p (tree var)
1407 return varpool_node (var)->finalized;
1410 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1411 must be emitted in this translation unit. Mark it as such. */
1414 mark_needed (tree decl)
1416 /* It's possible that we no longer need to set
1417 TREE_SYMBOL_REFERENCED here directly, but doing so is
1419 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1420 mark_decl_referenced (decl);
1423 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1424 returns true if a definition of this entity should be provided in
1425 this object file. Callers use this function to determine whether
1426 or not to let the back end know that a definition of DECL is
1427 available in this translation unit. */
1430 decl_needed_p (tree decl)
1432 gcc_assert (TREE_CODE (decl) == VAR_DECL
1433 || TREE_CODE (decl) == FUNCTION_DECL);
1434 /* This function should only be called at the end of the translation
1435 unit. We cannot be sure of whether or not something will be
1436 COMDAT until that point. */
1437 gcc_assert (at_eof);
1439 /* All entities with external linkage that are not COMDAT should be
1440 emitted; they may be referred to from other object files. */
1441 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1443 /* If this entity was used, let the back end see it; it will decide
1444 whether or not to emit it into the object file. */
1445 if (TREE_USED (decl)
1446 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1447 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1449 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1450 reference to DECL might cause it to be emitted later. */
1454 /* If necessary, write out the vtables for the dynamic class CTYPE.
1455 Returns true if any vtables were emitted. */
1458 maybe_emit_vtables (tree ctype)
1464 /* If the vtables for this class have already been emitted there is
1465 nothing more to do. */
1466 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1467 if (var_finalized_p (primary_vtbl))
1469 /* Ignore dummy vtables made by get_vtable_decl. */
1470 if (TREE_TYPE (primary_vtbl) == void_type_node)
1473 /* On some targets, we cannot determine the key method until the end
1474 of the translation unit -- which is when this function is
1476 if (!targetm.cxx.key_method_may_be_inline ())
1477 determine_key_method (ctype);
1479 /* See if any of the vtables are needed. */
1480 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1482 import_export_decl (vtbl);
1483 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1488 /* If the references to this class' vtables are optimized away,
1489 still emit the appropriate debugging information. See
1491 if (DECL_COMDAT (primary_vtbl)
1492 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1493 note_debug_info_needed (ctype);
1497 /* The ABI requires that we emit all of the vtables if we emit any
1499 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1501 /* Mark entities references from the virtual table as used. */
1502 mark_vtable_entries (vtbl);
1504 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1506 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1508 /* It had better be all done at compile-time. */
1513 DECL_EXTERNAL (vtbl) = 0;
1514 rest_of_decl_compilation (vtbl, 1, 1);
1516 /* Because we're only doing syntax-checking, we'll never end up
1517 actually marking the variable as written. */
1518 if (flag_syntax_only)
1519 TREE_ASM_WRITTEN (vtbl) = 1;
1522 /* Since we're writing out the vtable here, also write the debug
1524 note_debug_info_needed (ctype);
1529 /* A special return value from type_visibility meaning internal
1532 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1534 /* walk_tree helper function for type_visibility. */
1537 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1539 int *vis_p = (int *)data;
1544 else if (CLASS_TYPE_P (*tp))
1546 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1548 *vis_p = VISIBILITY_ANON;
1551 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1552 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1557 /* Returns the visibility of TYPE, which is the minimum visibility of its
1561 type_visibility (tree type)
1563 int vis = VISIBILITY_DEFAULT;
1564 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1568 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1569 specified (or if VISIBILITY is static). */
1572 constrain_visibility (tree decl, int visibility)
1574 if (visibility == VISIBILITY_ANON)
1576 /* extern "C" declarations aren't affected by the anonymous
1578 if (!DECL_EXTERN_C_P (decl))
1580 TREE_PUBLIC (decl) = 0;
1581 DECL_INTERFACE_KNOWN (decl) = 1;
1582 if (DECL_LANG_SPECIFIC (decl))
1583 DECL_NOT_REALLY_EXTERN (decl) = 1;
1586 else if (visibility > DECL_VISIBILITY (decl)
1587 && !DECL_VISIBILITY_SPECIFIED (decl))
1589 DECL_VISIBILITY (decl) = visibility;
1595 /* Constrain the visibility of DECL based on the visibility of its template
1599 constrain_visibility_for_template (tree decl, tree targs)
1601 /* If this is a template instantiation, check the innermost
1602 template args for visibility constraints. The outer template
1603 args are covered by the class check. */
1604 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1606 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1610 tree arg = TREE_VEC_ELT (args, i-1);
1612 vis = type_visibility (arg);
1613 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1616 if (TREE_CODE (arg) == ADDR_EXPR)
1617 arg = TREE_OPERAND (arg, 0);
1618 if (TREE_CODE (arg) == VAR_DECL
1619 || TREE_CODE (arg) == FUNCTION_DECL)
1621 if (! TREE_PUBLIC (arg))
1622 vis = VISIBILITY_ANON;
1624 vis = DECL_VISIBILITY (arg);
1628 constrain_visibility (decl, vis);
1632 /* Like c_determine_visibility, but with additional C++-specific
1635 Function-scope entities can rely on the function's visibility because
1636 it is set in start_preparsed_function.
1638 Class-scope entities cannot rely on the class's visibility until the end
1639 of the enclosing class definition.
1641 Note that because namespaces have multiple independent definitions,
1642 namespace visibility is handled elsewhere using the #pragma visibility
1643 machinery rather than by decorating the namespace declaration.
1645 The goal is for constraints from the type to give a diagnostic, and
1646 other constraints to be applied silently. */
1649 determine_visibility (tree decl)
1651 tree class_type = NULL_TREE;
1654 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1656 /* Only relevant for names with external linkage. */
1657 if (!TREE_PUBLIC (decl))
1660 /* Cloned constructors and destructors get the same visibility as
1661 the underlying function. That should be set up in
1662 maybe_clone_body. */
1663 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1665 if (TREE_CODE (decl) == TYPE_DECL)
1667 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1668 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1669 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1674 else if (DECL_LANG_SPECIFIC (decl))
1675 use_template = DECL_USE_TEMPLATE (decl);
1679 /* If DECL is a member of a class, visibility specifiers on the
1680 class can influence the visibility of the DECL. */
1681 if (DECL_CLASS_SCOPE_P (decl))
1682 class_type = DECL_CONTEXT (decl);
1685 /* Not a class member. */
1687 /* Virtual tables have DECL_CONTEXT set to their associated class,
1688 so they are automatically handled above. */
1689 gcc_assert (TREE_CODE (decl) != VAR_DECL
1690 || !DECL_VTABLE_OR_VTT_P (decl));
1692 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1694 /* Local statics and classes get the visibility of their
1695 containing function by default, except that
1696 -fvisibility-inlines-hidden doesn't affect them. */
1697 tree fn = DECL_CONTEXT (decl);
1698 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1700 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1701 DECL_VISIBILITY_SPECIFIED (decl) =
1702 DECL_VISIBILITY_SPECIFIED (fn);
1705 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1707 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1708 but have no TEMPLATE_INFO, so don't try to check it. */
1711 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1712 && flag_visibility_ms_compat)
1714 /* Under -fvisibility-ms-compat, types are visible by default,
1715 even though their contents aren't. */
1716 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1717 int underlying_vis = type_visibility (underlying_type);
1718 if (underlying_vis == VISIBILITY_ANON
1719 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1720 constrain_visibility (decl, underlying_vis);
1722 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1724 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1726 /* tinfo visibility is based on the type it's for. */
1727 constrain_visibility
1728 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1730 else if (use_template)
1731 /* Template instantiations and specializations get visibility based
1732 on their template unless they override it with an attribute. */;
1733 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1735 /* Set default visibility to whatever the user supplied with
1736 #pragma GCC visibility or a namespace visibility attribute. */
1737 DECL_VISIBILITY (decl) = default_visibility;
1738 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1744 /* If the specialization doesn't specify visibility, use the
1745 visibility from the template. */
1746 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1747 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1748 : DECL_TEMPLATE_INFO (decl));
1749 tree args = TI_ARGS (tinfo);
1751 if (args != error_mark_node)
1753 int depth = TMPL_ARGS_DEPTH (args);
1754 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1756 if (!DECL_VISIBILITY_SPECIFIED (decl))
1758 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1759 DECL_VISIBILITY_SPECIFIED (decl)
1760 = DECL_VISIBILITY_SPECIFIED (pattern);
1763 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1764 if (args && depth > template_class_depth (class_type))
1765 /* Limit visibility based on its template arguments. */
1766 constrain_visibility_for_template (decl, args);
1771 determine_visibility_from_class (decl, class_type);
1773 if (decl_anon_ns_mem_p (decl))
1774 /* Names in an anonymous namespace get internal linkage.
1775 This might change once we implement export. */
1776 constrain_visibility (decl, VISIBILITY_ANON);
1777 else if (TREE_CODE (decl) != TYPE_DECL)
1779 /* Propagate anonymity from type to decl. */
1780 int tvis = type_visibility (TREE_TYPE (decl));
1781 if (tvis == VISIBILITY_ANON
1782 || ! DECL_VISIBILITY_SPECIFIED (decl))
1783 constrain_visibility (decl, tvis);
1787 /* By default, static data members and function members receive
1788 the visibility of their containing class. */
1791 determine_visibility_from_class (tree decl, tree class_type)
1793 if (DECL_VISIBILITY_SPECIFIED (decl))
1796 if (visibility_options.inlines_hidden
1797 /* Don't do this for inline templates; specializations might not be
1798 inline, and we don't want them to inherit the hidden
1799 visibility. We'll set it here for all inline instantiations. */
1800 && !processing_template_decl
1801 && TREE_CODE (decl) == FUNCTION_DECL
1802 && DECL_DECLARED_INLINE_P (decl)
1803 && (! DECL_LANG_SPECIFIC (decl)
1804 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1805 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1808 /* Default to the class visibility. */
1809 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1810 DECL_VISIBILITY_SPECIFIED (decl)
1811 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1814 /* Give the target a chance to override the visibility associated
1816 if (TREE_CODE (decl) == VAR_DECL
1817 && (DECL_TINFO_P (decl)
1818 || (DECL_VTABLE_OR_VTT_P (decl)
1819 /* Construction virtual tables are not exported because
1820 they cannot be referred to from other object files;
1821 their name is not standardized by the ABI. */
1822 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1823 && TREE_PUBLIC (decl)
1824 && !DECL_REALLY_EXTERN (decl)
1825 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1826 targetm.cxx.determine_class_data_visibility (decl);
1829 /* Constrain the visibility of a class TYPE based on the visibility of its
1830 field types. Warn if any fields require lesser visibility. */
1833 constrain_class_visibility (tree type)
1839 int vis = type_visibility (type);
1841 if (vis == VISIBILITY_ANON
1842 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1845 /* Don't warn about visibility if the class has explicit visibility. */
1846 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1847 vis = VISIBILITY_INTERNAL;
1849 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1850 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1852 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
1853 int subvis = type_visibility (ftype);
1855 if (subvis == VISIBILITY_ANON)
1857 if (!in_main_input_context ())
1859 %qT has a field %qD whose type uses the anonymous namespace",
1862 else if (IS_AGGR_TYPE (ftype)
1863 && vis < VISIBILITY_HIDDEN
1864 && subvis >= VISIBILITY_HIDDEN)
1865 warning (OPT_Wattributes, "\
1866 %qT declared with greater visibility than the type of its field %qD",
1870 binfo = TYPE_BINFO (type);
1871 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1873 int subvis = type_visibility (TREE_TYPE (t));
1875 if (subvis == VISIBILITY_ANON)
1877 if (!in_main_input_context())
1879 %qT has a base %qT whose type uses the anonymous namespace",
1880 type, TREE_TYPE (t));
1882 else if (vis < VISIBILITY_HIDDEN
1883 && subvis >= VISIBILITY_HIDDEN)
1884 warning (OPT_Wattributes, "\
1885 %qT declared with greater visibility than its base %qT",
1886 type, TREE_TYPE (t));
1890 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1891 for DECL has not already been determined, do so now by setting
1892 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1893 function is called entities with vague linkage whose definitions
1894 are available must have TREE_PUBLIC set.
1896 If this function decides to place DECL in COMDAT, it will set
1897 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1898 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1899 callers defer that decision until it is clear that DECL is actually
1903 import_export_decl (tree decl)
1908 tree class_type = NULL_TREE;
1910 if (DECL_INTERFACE_KNOWN (decl))
1913 /* We cannot determine what linkage to give to an entity with vague
1914 linkage until the end of the file. For example, a virtual table
1915 for a class will be defined if and only if the key method is
1916 defined in this translation unit. As a further example, consider
1917 that when compiling a translation unit that uses PCH file with
1918 "-frepo" it would be incorrect to make decisions about what
1919 entities to emit when building the PCH; those decisions must be
1920 delayed until the repository information has been processed. */
1921 gcc_assert (at_eof);
1922 /* Object file linkage for explicit instantiations is handled in
1923 mark_decl_instantiated. For static variables in functions with
1924 vague linkage, maybe_commonize_var is used.
1926 Therefore, the only declarations that should be provided to this
1927 function are those with external linkage that are:
1929 * implicit instantiations of function templates
1933 * implicit instantiations of static data members of class
1940 Furthermore, all entities that reach this point must have a
1941 definition available in this translation unit.
1943 The following assertions check these conditions. */
1944 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1945 || TREE_CODE (decl) == VAR_DECL);
1946 /* Any code that creates entities with TREE_PUBLIC cleared should
1947 also set DECL_INTERFACE_KNOWN. */
1948 gcc_assert (TREE_PUBLIC (decl));
1949 if (TREE_CODE (decl) == FUNCTION_DECL)
1950 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1951 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1952 || DECL_DECLARED_INLINE_P (decl));
1954 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1955 || DECL_VTABLE_OR_VTT_P (decl)
1956 || DECL_TINFO_P (decl));
1957 /* Check that a definition of DECL is available in this translation
1959 gcc_assert (!DECL_REALLY_EXTERN (decl));
1961 /* Assume that DECL will not have COMDAT linkage. */
1963 /* Assume that DECL will not be imported into this translation
1967 /* See if the repository tells us whether or not to emit DECL in
1968 this translation unit. */
1969 emit_p = repo_emit_p (decl);
1972 else if (emit_p == 1)
1974 /* The repository indicates that this entity should be defined
1975 here. Make sure the back end honors that request. */
1976 if (TREE_CODE (decl) == VAR_DECL)
1978 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1979 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1982 FOR_EACH_CLONE (clone, decl)
1983 mark_needed (clone);
1987 /* Output the definition as an ordinary strong definition. */
1988 DECL_EXTERNAL (decl) = 0;
1989 DECL_INTERFACE_KNOWN (decl) = 1;
1994 /* We have already decided what to do with this DECL; there is no
1995 need to check anything further. */
1997 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1999 class_type = DECL_CONTEXT (decl);
2000 import_export_class (class_type);
2001 if (TYPE_FOR_JAVA (class_type))
2003 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2004 && CLASSTYPE_INTERFACE_ONLY (class_type))
2006 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2007 && !CLASSTYPE_USE_TEMPLATE (class_type)
2008 && CLASSTYPE_KEY_METHOD (class_type)
2009 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2010 /* The ABI requires that all virtual tables be emitted with
2011 COMDAT linkage. However, on systems where COMDAT symbols
2012 don't show up in the table of contents for a static
2013 archive, or on systems without weak symbols (where we
2014 approximate COMDAT linkage by using internal linkage), the
2015 linker will report errors about undefined symbols because
2016 it will not see the virtual table definition. Therefore,
2017 in the case that we know that the virtual table will be
2018 emitted in only one translation unit, we make the virtual
2019 table an ordinary definition with external linkage. */
2020 DECL_EXTERNAL (decl) = 0;
2021 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2023 /* CLASS_TYPE is being exported from this translation unit,
2024 so DECL should be defined here. */
2025 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2026 /* If a class is declared in a header with the "extern
2027 template" extension, then it will not be instantiated,
2028 even in translation units that would normally require
2029 it. Often such classes are explicitly instantiated in
2030 one translation unit. Therefore, the explicit
2031 instantiation must be made visible to other translation
2033 DECL_EXTERNAL (decl) = 0;
2036 /* The generic C++ ABI says that class data is always
2037 COMDAT, even if there is a key function. Some
2038 variants (e.g., the ARM EABI) says that class data
2039 only has COMDAT linkage if the class data might be
2040 emitted in more than one translation unit. When the
2041 key method can be inline and is inline, we still have
2042 to arrange for comdat even though
2043 class_data_always_comdat is false. */
2044 if (!CLASSTYPE_KEY_METHOD (class_type)
2045 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2046 || targetm.cxx.class_data_always_comdat ())
2048 /* The ABI requires COMDAT linkage. Normally, we
2049 only emit COMDAT things when they are needed;
2050 make sure that we realize that this entity is
2057 else if (!flag_implicit_templates
2058 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2063 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2065 tree type = TREE_TYPE (DECL_NAME (decl));
2066 if (CLASS_TYPE_P (type))
2069 import_export_class (type);
2070 if (CLASSTYPE_INTERFACE_KNOWN (type)
2071 && TYPE_POLYMORPHIC_P (type)
2072 && CLASSTYPE_INTERFACE_ONLY (type)
2073 /* If -fno-rtti was specified, then we cannot be sure
2074 that RTTI information will be emitted with the
2075 virtual table of the class, so we must emit it
2076 wherever it is used. */
2081 if (CLASSTYPE_INTERFACE_KNOWN (type)
2082 && !CLASSTYPE_INTERFACE_ONLY (type))
2084 comdat_p = (targetm.cxx.class_data_always_comdat ()
2085 || (CLASSTYPE_KEY_METHOD (type)
2086 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2091 DECL_EXTERNAL (decl) = 0;
2101 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2102 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2104 /* DECL is an implicit instantiation of a function or static
2106 if (flag_implicit_templates
2107 || (flag_implicit_inline_templates
2108 && TREE_CODE (decl) == FUNCTION_DECL
2109 && DECL_DECLARED_INLINE_P (decl)))
2112 /* If we are not implicitly generating templates, then mark
2113 this entity as undefined in this translation unit. */
2116 else if (DECL_FUNCTION_MEMBER_P (decl))
2118 if (!DECL_DECLARED_INLINE_P (decl))
2120 tree ctype = DECL_CONTEXT (decl);
2121 import_export_class (ctype);
2122 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2124 DECL_NOT_REALLY_EXTERN (decl)
2125 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2126 || (DECL_DECLARED_INLINE_P (decl)
2127 && ! flag_implement_inlines
2128 && !DECL_VINDEX (decl)));
2130 if (!DECL_NOT_REALLY_EXTERN (decl))
2131 DECL_EXTERNAL (decl) = 1;
2133 /* Always make artificials weak. */
2134 if (DECL_ARTIFICIAL (decl) && flag_weak)
2137 maybe_make_one_only (decl);
2148 /* If we are importing DECL into this translation unit, mark is
2149 an undefined here. */
2150 DECL_EXTERNAL (decl) = 1;
2151 DECL_NOT_REALLY_EXTERN (decl) = 0;
2155 /* If we decided to put DECL in COMDAT, mark it accordingly at
2157 comdat_linkage (decl);
2160 DECL_INTERFACE_KNOWN (decl) = 1;
2163 /* Return an expression that performs the destruction of DECL, which
2164 must be a VAR_DECL whose type has a non-trivial destructor, or is
2165 an array whose (innermost) elements have a non-trivial destructor. */
2168 build_cleanup (tree decl)
2171 tree type = TREE_TYPE (decl);
2173 /* This function should only be called for declarations that really
2174 require cleanups. */
2175 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2177 /* Treat all objects with destructors as used; the destructor may do
2178 something substantive. */
2181 if (TREE_CODE (type) == ARRAY_TYPE)
2184 temp = build_address (decl);
2185 temp = build_delete (TREE_TYPE (temp), temp,
2186 sfk_complete_destructor,
2187 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2191 /* Returns the initialization guard variable for the variable DECL,
2192 which has static storage duration. */
2195 get_guard (tree decl)
2200 sname = mangle_guard_variable (decl);
2201 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2206 /* We use a type that is big enough to contain a mutex as well
2207 as an integer counter. */
2208 guard_type = targetm.cxx.guard_type ();
2209 guard = build_decl (VAR_DECL, sname, guard_type);
2211 /* The guard should have the same linkage as what it guards. */
2212 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2213 TREE_STATIC (guard) = TREE_STATIC (decl);
2214 DECL_COMMON (guard) = DECL_COMMON (decl);
2215 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2216 if (TREE_PUBLIC (decl))
2217 DECL_WEAK (guard) = DECL_WEAK (decl);
2218 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2219 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2221 DECL_ARTIFICIAL (guard) = 1;
2222 DECL_IGNORED_P (guard) = 1;
2223 TREE_USED (guard) = 1;
2224 pushdecl_top_level_and_finish (guard, NULL_TREE);
2229 /* Return those bits of the GUARD variable that should be set when the
2230 guarded entity is actually initialized. */
2233 get_guard_bits (tree guard)
2235 if (!targetm.cxx.guard_mask_bit ())
2237 /* We only set the first byte of the guard, in order to leave room
2238 for a mutex in the high-order bits. */
2239 guard = build1 (ADDR_EXPR,
2240 build_pointer_type (TREE_TYPE (guard)),
2242 guard = build1 (NOP_EXPR,
2243 build_pointer_type (char_type_node),
2245 guard = build1 (INDIRECT_REF, char_type_node, guard);
2251 /* Return an expression which determines whether or not the GUARD
2252 variable has already been initialized. */
2255 get_guard_cond (tree guard)
2259 /* Check to see if the GUARD is zero. */
2260 guard = get_guard_bits (guard);
2262 /* Mask off all but the low bit. */
2263 if (targetm.cxx.guard_mask_bit ())
2265 guard_value = integer_one_node;
2266 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2267 guard_value = convert (TREE_TYPE (guard), guard_value);
2268 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2271 guard_value = integer_zero_node;
2272 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2273 guard_value = convert (TREE_TYPE (guard), guard_value);
2274 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2277 /* Return an expression which sets the GUARD variable, indicating that
2278 the variable being guarded has been initialized. */
2281 set_guard (tree guard)
2285 /* Set the GUARD to one. */
2286 guard = get_guard_bits (guard);
2287 guard_init = integer_one_node;
2288 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2289 guard_init = convert (TREE_TYPE (guard), guard_init);
2290 return build_modify_expr (guard, NOP_EXPR, guard_init);
2293 /* Start the process of running a particular set of global constructors
2294 or destructors. Subroutine of do_[cd]tors. */
2297 start_objects (int method_type, int initp)
2303 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2305 if (initp != DEFAULT_INIT_PRIORITY)
2315 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2318 sprintf (type, "%c", method_type);
2320 fndecl = build_lang_decl (FUNCTION_DECL,
2321 get_file_function_name (type),
2322 build_function_type (void_type_node,
2324 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2326 TREE_PUBLIC (current_function_decl) = 0;
2328 /* Mark as artificial because it's not explicitly in the user's
2330 DECL_ARTIFICIAL (current_function_decl) = 1;
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);
2359 if (method_type == 'I')
2361 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2362 decl_init_priority_insert (fn, initp);
2366 DECL_STATIC_DESTRUCTOR (fn) = 1;
2367 decl_fini_priority_insert (fn, initp);
2370 expand_or_defer_fn (fn);
2373 /* The names of the parameters to the function created to handle
2374 initializations and destructions for objects with static storage
2376 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2377 #define PRIORITY_IDENTIFIER "__priority"
2379 /* The name of the function we create to handle initializations and
2380 destructions for objects with static storage duration. */
2381 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2383 /* The declaration for the __INITIALIZE_P argument. */
2384 static GTY(()) tree initialize_p_decl;
2386 /* The declaration for the __PRIORITY argument. */
2387 static GTY(()) tree priority_decl;
2389 /* The declaration for the static storage duration function. */
2390 static GTY(()) tree ssdf_decl;
2392 /* All the static storage duration functions created in this
2393 translation unit. */
2394 static GTY(()) VEC(tree,gc) *ssdf_decls;
2396 /* A map from priority levels to information about that priority
2397 level. There may be many such levels, so efficient lookup is
2399 static splay_tree priority_info_map;
2401 /* Begins the generation of the function that will handle all
2402 initialization and destruction of objects with static storage
2403 duration. The function generated takes two parameters of type
2404 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2405 nonzero, it performs initializations. Otherwise, it performs
2406 destructions. It only performs those initializations or
2407 destructions with the indicated __PRIORITY. The generated function
2410 It is assumed that this function will only be called once per
2411 translation unit. */
2414 start_static_storage_duration_function (unsigned count)
2419 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2421 /* Create the identifier for this function. It will be of the form
2422 SSDF_IDENTIFIER_<number>. */
2423 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2425 /* Create the parameters. */
2426 parm_types = void_list_node;
2427 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2428 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2429 type = build_function_type (void_type_node, parm_types);
2431 /* Create the FUNCTION_DECL itself. */
2432 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2433 get_identifier (id),
2435 TREE_PUBLIC (ssdf_decl) = 0;
2436 DECL_ARTIFICIAL (ssdf_decl) = 1;
2437 DECL_INLINE (ssdf_decl) = 1;
2439 /* Put this function in the list of functions to be called from the
2440 static constructors and destructors. */
2443 ssdf_decls = VEC_alloc (tree, gc, 32);
2445 /* Take this opportunity to initialize the map from priority
2446 numbers to information about that priority level. */
2447 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2448 /*delete_key_fn=*/0,
2449 /*delete_value_fn=*/
2450 (splay_tree_delete_value_fn) &free);
2452 /* We always need to generate functions for the
2453 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2454 priorities later, we'll be sure to find the
2455 DEFAULT_INIT_PRIORITY. */
2456 get_priority_info (DEFAULT_INIT_PRIORITY);
2459 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2461 /* Create the argument list. */
2462 initialize_p_decl = cp_build_parm_decl
2463 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2464 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2465 TREE_USED (initialize_p_decl) = 1;
2466 priority_decl = cp_build_parm_decl
2467 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2468 DECL_CONTEXT (priority_decl) = ssdf_decl;
2469 TREE_USED (priority_decl) = 1;
2471 TREE_CHAIN (initialize_p_decl) = priority_decl;
2472 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2474 /* Put the function in the global scope. */
2475 pushdecl (ssdf_decl);
2477 /* Start the function itself. This is equivalent to declaring the
2480 static void __ssdf (int __initialize_p, init __priority_p);
2482 It is static because we only need to call this function from the
2483 various constructor and destructor functions for this module. */
2484 start_preparsed_function (ssdf_decl,
2485 /*attrs=*/NULL_TREE,
2488 /* Set up the scope of the outermost block in the function. */
2489 body = begin_compound_stmt (BCS_FN_BODY);
2494 /* Finish the generation of the function which performs initialization
2495 and destruction of objects with static storage duration. After
2496 this point, no more such objects can be created. */
2499 finish_static_storage_duration_function (tree body)
2501 /* Close out the function. */
2502 finish_compound_stmt (body);
2503 expand_or_defer_fn (finish_function (0));
2506 /* Return the information about the indicated PRIORITY level. If no
2507 code to handle this level has yet been generated, generate the
2508 appropriate prologue. */
2510 static priority_info
2511 get_priority_info (int priority)
2516 n = splay_tree_lookup (priority_info_map,
2517 (splay_tree_key) priority);
2520 /* Create a new priority information structure, and insert it
2522 pi = XNEW (struct priority_info_s);
2523 pi->initializations_p = 0;
2524 pi->destructions_p = 0;
2525 splay_tree_insert (priority_info_map,
2526 (splay_tree_key) priority,
2527 (splay_tree_value) pi);
2530 pi = (priority_info) n->value;
2535 /* The effective initialization priority of a DECL. */
2537 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2538 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2539 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2541 /* Whether a DECL needs a guard to protect it against multiple
2544 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2545 || DECL_ONE_ONLY (decl) \
2546 || DECL_WEAK (decl)))
2548 /* Set up to handle the initialization or destruction of DECL. If
2549 INITP is nonzero, we are initializing the variable. Otherwise, we
2550 are destroying it. */
2553 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2555 tree guard_if_stmt = NULL_TREE;
2558 /* If we are supposed to destruct and there's a trivial destructor,
2559 nothing has to be done. */
2561 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2564 /* Trick the compiler into thinking we are at the file and line
2565 where DECL was declared so that error-messages make sense, and so
2566 that the debugger will show somewhat sensible file and line
2568 input_location = DECL_SOURCE_LOCATION (decl);
2574 Access control for implicit calls to the constructors,
2575 the conversion functions, or the destructor called to
2576 create and destroy a static data member is performed as
2577 if these calls appeared in the scope of the member's
2580 we pretend we are in a static member function of the class of
2581 which the DECL is a member. */
2582 if (member_p (decl))
2584 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2585 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2588 /* Assume we don't need a guard. */
2590 /* We need a guard if this is an object with external linkage that
2591 might be initialized in more than one place. (For example, a
2592 static data member of a template, when the data member requires
2594 if (NEEDS_GUARD_P (decl))
2598 guard = get_guard (decl);
2600 /* When using __cxa_atexit, we just check the GUARD as we would
2601 for a local static. */
2602 if (flag_use_cxa_atexit)
2604 /* When using __cxa_atexit, we never try to destroy
2605 anything from a static destructor. */
2607 guard_cond = get_guard_cond (guard);
2609 /* If we don't have __cxa_atexit, then we will be running
2610 destructors from .fini sections, or their equivalents. So,
2611 we need to know how many times we've tried to initialize this
2612 object. We do initializations only if the GUARD is zero,
2613 i.e., if we are the first to initialize the variable. We do
2614 destructions only if the GUARD is one, i.e., if we are the
2615 last to destroy the variable. */
2618 = cp_build_binary_op (EQ_EXPR,
2619 build_unary_op (PREINCREMENT_EXPR,
2625 = cp_build_binary_op (EQ_EXPR,
2626 build_unary_op (PREDECREMENT_EXPR,
2631 guard_if_stmt = begin_if_stmt ();
2632 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2636 /* If we're using __cxa_atexit, we have not already set the GUARD,
2637 so we must do so now. */
2638 if (guard && initp && flag_use_cxa_atexit)
2639 finish_expr_stmt (set_guard (guard));
2641 /* Perform the initialization or destruction. */
2645 finish_expr_stmt (init);
2647 /* If we're using __cxa_atexit, register a function that calls the
2648 destructor for the object. */
2649 if (flag_use_cxa_atexit)
2650 finish_expr_stmt (register_dtor_fn (decl));
2653 finish_expr_stmt (build_cleanup (decl));
2655 /* Finish the guard if-stmt, if necessary. */
2658 finish_then_clause (guard_if_stmt);
2659 finish_if_stmt (guard_if_stmt);
2662 /* Now that we're done with DECL we don't need to pretend to be a
2663 member of its class any longer. */
2664 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2665 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2668 /* Generate code to do the initialization or destruction of the decls in VARS,
2669 a TREE_LIST of VAR_DECL with static storage duration.
2670 Whether initialization or destruction is performed is specified by INITP. */
2673 do_static_initialization_or_destruction (tree vars, bool initp)
2675 tree node, init_if_stmt, cond;
2677 /* Build the outer if-stmt to check for initialization or destruction. */
2678 init_if_stmt = begin_if_stmt ();
2679 cond = initp ? integer_one_node : integer_zero_node;
2680 cond = cp_build_binary_op (EQ_EXPR,
2683 finish_if_stmt_cond (cond, init_if_stmt);
2687 tree decl = TREE_VALUE (node);
2688 tree priority_if_stmt;
2692 /* If we don't need a destructor, there's nothing to do. Avoid
2693 creating a possibly empty if-stmt. */
2694 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2696 node = TREE_CHAIN (node);
2700 /* Remember that we had an initialization or finalization at this
2702 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2703 pi = get_priority_info (priority);
2705 pi->initializations_p = 1;
2707 pi->destructions_p = 1;
2709 /* Conditionalize this initialization on being in the right priority
2710 and being initializing/finalizing appropriately. */
2711 priority_if_stmt = begin_if_stmt ();
2712 cond = cp_build_binary_op (EQ_EXPR,
2714 build_int_cst (NULL_TREE, priority));
2715 finish_if_stmt_cond (cond, priority_if_stmt);
2717 /* Process initializers with same priority. */
2719 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2720 node = TREE_CHAIN (node))
2721 /* Do one initialization or destruction. */
2722 one_static_initialization_or_destruction (TREE_VALUE (node),
2723 TREE_PURPOSE (node), initp);
2725 /* Finish up the priority if-stmt body. */
2726 finish_then_clause (priority_if_stmt);
2727 finish_if_stmt (priority_if_stmt);
2731 /* Finish up the init/destruct if-stmt body. */
2732 finish_then_clause (init_if_stmt);
2733 finish_if_stmt (init_if_stmt);
2736 /* VARS is a list of variables with static storage duration which may
2737 need initialization and/or finalization. Remove those variables
2738 that don't really need to be initialized or finalized, and return
2739 the resulting list. The order in which the variables appear in
2740 VARS is in reverse order of the order in which they should actually
2741 be initialized. The list we return is in the unreversed order;
2742 i.e., the first variable should be initialized first. */
2745 prune_vars_needing_no_initialization (tree *vars)
2748 tree result = NULL_TREE;
2753 tree decl = TREE_VALUE (t);
2754 tree init = TREE_PURPOSE (t);
2756 /* Deal gracefully with error. */
2757 if (decl == error_mark_node)
2759 var = &TREE_CHAIN (t);
2763 /* The only things that can be initialized are variables. */
2764 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2766 /* If this object is not defined, we don't need to do anything
2768 if (DECL_EXTERNAL (decl))
2770 var = &TREE_CHAIN (t);
2774 /* Also, if the initializer already contains errors, we can bail
2776 if (init && TREE_CODE (init) == TREE_LIST
2777 && value_member (error_mark_node, init))
2779 var = &TREE_CHAIN (t);
2783 /* This variable is going to need initialization and/or
2784 finalization, so we add it to the list. */
2785 *var = TREE_CHAIN (t);
2786 TREE_CHAIN (t) = result;
2793 /* Make sure we have told the back end about all the variables in
2797 write_out_vars (tree vars)
2801 for (v = vars; v; v = TREE_CHAIN (v))
2803 tree var = TREE_VALUE (v);
2804 if (!var_finalized_p (var))
2806 import_export_decl (var);
2807 rest_of_decl_compilation (var, 1, 1);
2812 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2813 (otherwise) that will initialize all global objects with static
2814 storage duration having the indicated PRIORITY. */
2817 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2826 input_location = *locus;
2827 #ifdef USE_MAPPED_LOCATION
2833 /* We use `I' to indicate initialization and `D' to indicate
2835 function_key = constructor_p ? 'I' : 'D';
2837 /* We emit the function lazily, to avoid generating empty
2838 global constructors and destructors. */
2841 /* For Objective-C++, we may need to initialize metadata found in this module.
2842 This must be done _before_ any other static initializations. */
2843 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2844 && constructor_p && objc_static_init_needed_p ())
2846 body = start_objects (function_key, priority);
2847 objc_generate_static_init_call (NULL_TREE);
2850 /* Call the static storage duration function with appropriate
2852 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2854 /* Calls to pure or const functions will expand to nothing. */
2855 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2858 body = start_objects (function_key, priority);
2860 arguments = tree_cons (NULL_TREE,
2861 build_int_cst (NULL_TREE, priority),
2863 arguments = tree_cons (NULL_TREE,
2864 build_int_cst (NULL_TREE, constructor_p),
2866 finish_expr_stmt (build_function_call (fndecl, arguments));
2870 /* Close out the function. */
2872 finish_objects (function_key, priority, body);
2875 /* Generate constructor and destructor functions for the priority
2879 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2881 location_t *locus = (location_t *) data;
2882 int priority = (int) n->key;
2883 priority_info pi = (priority_info) n->value;
2885 /* Generate the functions themselves, but only if they are really
2887 if (pi->initializations_p)
2888 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2889 if (pi->destructions_p)
2890 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2892 /* Keep iterating. */
2896 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2897 decls referenced from front-end specific constructs; it will be called
2898 only for language-specific tree nodes.
2900 Here we must deal with member pointers. */
2903 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2904 tree from ATTRIBUTE_UNUSED)
2908 switch (TREE_CODE (t))
2911 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2912 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2915 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2916 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2919 if (DECL_VTABLE_OR_VTT_P (t))
2921 /* The ABI requires that all virtual tables be emitted
2922 whenever one of them is. */
2924 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2926 vtbl = TREE_CHAIN (vtbl))
2927 mark_decl_referenced (vtbl);
2929 else if (DECL_CONTEXT (t)
2930 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2931 /* If we need a static variable in a function, then we
2932 need the containing function. */
2933 mark_decl_referenced (DECL_CONTEXT (t));
2942 /* Java requires that we be able to reference a local address for a
2943 method, and not be confused by PLT entries. If hidden aliases are
2944 supported, emit one for each java function that we've emitted. */
2947 build_java_method_aliases (void)
2949 struct cgraph_node *node;
2951 #ifndef HAVE_GAS_HIDDEN
2955 for (node = cgraph_nodes; node ; node = node->next)
2957 tree fndecl = node->decl;
2959 if (TREE_ASM_WRITTEN (fndecl)
2960 && DECL_CONTEXT (fndecl)
2961 && TYPE_P (DECL_CONTEXT (fndecl))
2962 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2963 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2965 /* Mangle the name in a predictable way; we need to reference
2966 this from a java compiled object file. */
2967 tree oid, nid, alias;
2971 oid = DECL_ASSEMBLER_NAME (fndecl);
2972 oname = IDENTIFIER_POINTER (oid);
2973 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
2974 nname = ACONCAT (("_ZGA", oname+2, NULL));
2975 nid = get_identifier (nname);
2977 alias = make_alias_for (fndecl, nid);
2978 TREE_PUBLIC (alias) = 1;
2979 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
2981 assemble_alias (alias, oid);
2986 /* This routine is called at the end of compilation.
2987 Its job is to create all the code needed to initialize and
2988 destroy the global aggregates. We do the destruction
2989 first, since that way we only need to reverse the decls once. */
2992 cp_write_global_declarations (void)
2998 unsigned ssdf_count = 0;
3002 locus = input_location;
3005 /* Bad parse errors. Just forget about it. */
3006 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3010 c_common_write_pch ();
3012 #ifdef USE_MAPPED_LOCATION
3015 /* Otherwise, GDB can get confused, because in only knows
3016 about source for LINENO-1 lines. */
3020 /* We now have to write out all the stuff we put off writing out.
3023 o Template specializations that we have not yet instantiated,
3024 but which are needed.
3025 o Initialization and destruction for non-local objects with
3026 static storage duration. (Local objects with static storage
3027 duration are initialized when their scope is first entered,
3028 and are cleaned up via atexit.)
3029 o Virtual function tables.
3031 All of these may cause others to be needed. For example,
3032 instantiating one function may cause another to be needed, and
3033 generating the initializer for an object may cause templates to be
3034 instantiated, etc., etc. */
3036 timevar_push (TV_VARCONST);
3038 emit_support_tinfos ();
3047 /* If there are templates that we've put off instantiating, do
3049 instantiate_pending_templates (retries);
3052 /* Write out virtual tables as required. Note that writing out
3053 the virtual table for a template class may cause the
3054 instantiation of members of that class. If we write out
3055 vtables then we remove the class from our list so we don't
3056 have to look at it again. */
3058 while (keyed_classes != NULL_TREE
3059 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3062 keyed_classes = TREE_CHAIN (keyed_classes);
3068 tree next = TREE_CHAIN (t);
3072 if (maybe_emit_vtables (TREE_VALUE (next)))
3075 TREE_CHAIN (t) = TREE_CHAIN (next);
3080 next = TREE_CHAIN (t);
3084 /* Write out needed type info variables. We have to be careful
3085 looping through unemitted decls, because emit_tinfo_decl may
3086 cause other variables to be needed. New elements will be
3087 appended, and we remove from the vector those that actually
3089 for (i = VEC_length (tree, unemitted_tinfo_decls);
3090 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3091 if (emit_tinfo_decl (t))
3094 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3097 /* The list of objects with static storage duration is built up
3098 in reverse order. We clear STATIC_AGGREGATES so that any new
3099 aggregates added during the initialization of these will be
3100 initialized in the correct order when we next come around the
3102 vars = prune_vars_needing_no_initialization (&static_aggregates);
3106 /* We need to start a new initialization function each time
3107 through the loop. That's because we need to know which
3108 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3109 isn't computed until a function is finished, and written
3110 out. That's a deficiency in the back end. When this is
3111 fixed, these initialization functions could all become
3112 inline, with resulting performance improvements. */
3115 /* Set the line and file, so that it is obviously not from
3117 input_location = locus;
3118 ssdf_body = start_static_storage_duration_function (ssdf_count);
3120 /* Make sure the back end knows about all the variables. */
3121 write_out_vars (vars);
3123 /* First generate code to do all the initializations. */
3125 do_static_initialization_or_destruction (vars, /*initp=*/true);
3127 /* Then, generate code to do all the destructions. Do these
3128 in reverse order so that the most recently constructed
3129 variable is the first destroyed. If we're using
3130 __cxa_atexit, then we don't need to do this; functions
3131 were registered at initialization time to destroy the
3133 if (!flag_use_cxa_atexit && vars)
3135 vars = nreverse (vars);
3136 do_static_initialization_or_destruction (vars, /*initp=*/false);
3141 /* Finish up the static storage duration function for this
3143 input_location = locus;
3144 finish_static_storage_duration_function (ssdf_body);
3146 /* All those initializations and finalizations might cause
3147 us to need more inline functions, more template
3148 instantiations, etc. */
3151 #ifdef USE_MAPPED_LOCATION
3158 /* Go through the set of inline functions whose bodies have not
3159 been emitted yet. If out-of-line copies of these functions
3160 are required, emit them. */
3161 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3163 /* Does it need synthesizing? */
3164 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3165 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3167 /* Even though we're already at the top-level, we push
3168 there again. That way, when we pop back a few lines
3169 hence, all of our state is restored. Otherwise,
3170 finish_function doesn't clean things up, and we end
3171 up with CURRENT_FUNCTION_DECL set. */
3172 push_to_top_level ();
3173 /* The decl's location will mark where it was first
3174 needed. Save that so synthesize method can indicate
3175 where it was needed from, in case of error */
3176 input_location = DECL_SOURCE_LOCATION (decl);
3177 synthesize_method (decl);
3178 pop_from_top_level ();
3182 if (!DECL_SAVED_TREE (decl))
3185 /* We lie to the back end, pretending that some functions
3186 are not defined when they really are. This keeps these
3187 functions from being put out unnecessarily. But, we must
3188 stop lying when the functions are referenced, or if they
3189 are not comdat since they need to be put out now. If
3190 DECL_INTERFACE_KNOWN, then we have already set
3191 DECL_EXTERNAL appropriately, so there's no need to check
3192 again, and we do not want to clear DECL_EXTERNAL if a
3193 previous call to import_export_decl set it.
3195 This is done in a separate for cycle, because if some
3196 deferred function is contained in another deferred
3197 function later in deferred_fns varray,
3198 rest_of_compilation would skip this function and we
3199 really cannot expand the same function twice. */
3200 import_export_decl (decl);
3201 if (DECL_NOT_REALLY_EXTERN (decl)
3202 && DECL_INITIAL (decl)
3203 && decl_needed_p (decl))
3204 DECL_EXTERNAL (decl) = 0;
3206 /* If we're going to need to write this function out, and
3207 there's already a body for it, create RTL for it now.
3208 (There might be no body if this is a method we haven't
3209 gotten around to synthesizing yet.) */
3210 if (!DECL_EXTERNAL (decl)
3211 && decl_needed_p (decl)
3212 && !TREE_ASM_WRITTEN (decl)
3213 && !cgraph_node (decl)->local.finalized)
3215 /* We will output the function; no longer consider it in this
3217 DECL_DEFER_OUTPUT (decl) = 0;
3218 /* Generate RTL for this function now that we know we
3220 expand_or_defer_fn (decl);
3221 /* If we're compiling -fsyntax-only pretend that this
3222 function has been written out so that we don't try to
3224 if (flag_syntax_only)
3225 TREE_ASM_WRITTEN (decl) = 1;
3230 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3233 /* Static data members are just like namespace-scope globals. */
3234 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3236 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3238 import_export_decl (decl);
3239 /* If this static data member is needed, provide it to the
3241 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3242 DECL_EXTERNAL (decl) = 0;
3244 if (VEC_length (tree, pending_statics) != 0
3245 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3246 VEC_length (tree, pending_statics)))
3253 /* All used inline functions must have a definition at this point. */
3254 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3256 if (/* Check online inline functions that were actually used. */
3257 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3258 /* If the definition actually was available here, then the
3259 fact that the function was not defined merely represents
3260 that for some reason (use of a template repository,
3261 #pragma interface, etc.) we decided not to emit the
3263 && !DECL_INITIAL (decl)
3264 /* An explicit instantiation can be used to specify
3265 that the body is in another unit. It will have
3266 already verified there was a definition. */
3267 && !DECL_EXPLICIT_INSTANTIATION (decl))
3269 warning (0, "inline function %q+D used but never defined", decl);
3270 /* Avoid a duplicate warning from check_global_declaration_1. */
3271 TREE_NO_WARNING (decl) = 1;
3275 /* We give C linkage to static constructors and destructors. */
3276 push_lang_context (lang_name_c);
3278 /* Generate initialization and destruction functions for all
3279 priorities for which they are required. */
3280 if (priority_info_map)
3281 splay_tree_foreach (priority_info_map,
3282 generate_ctor_and_dtor_functions_for_priority,
3284 else if (c_dialect_objc () && objc_static_init_needed_p ())
3285 /* If this is obj-c++ and we need a static init, call
3286 generate_ctor_or_dtor_function. */
3287 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3288 DEFAULT_INIT_PRIORITY, &locus);
3290 /* We're done with the splay-tree now. */
3291 if (priority_info_map)
3292 splay_tree_delete (priority_info_map);
3294 /* Generate any missing aliases. */
3295 maybe_apply_pending_pragma_weaks ();
3297 /* We're done with static constructors, so we can go back to "C++"
3299 pop_lang_context ();
3301 cgraph_finalize_compilation_unit ();
3304 /* Now, issue warnings about static, but not defined, functions,
3305 etc., and emit debugging information. */
3306 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3307 if (VEC_length (tree, pending_statics) != 0)
3309 check_global_declarations (VEC_address (tree, pending_statics),
3310 VEC_length (tree, pending_statics));
3311 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3312 VEC_length (tree, pending_statics));
3315 /* Generate hidden aliases for Java. */
3316 build_java_method_aliases ();
3320 /* The entire file is now complete. If requested, dump everything
3324 FILE *stream = dump_begin (TDI_tu, &flags);
3328 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3329 dump_end (TDI_tu, stream);
3333 timevar_pop (TV_VARCONST);
3335 if (flag_detailed_statistics)
3337 dump_tree_statistics ();
3338 dump_time_statistics ();
3340 input_location = locus;
3342 #ifdef ENABLE_CHECKING
3343 validate_conversion_obstack ();
3344 #endif /* ENABLE_CHECKING */
3347 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3348 function to call in parse-tree form; it has not yet been
3349 semantically analyzed. ARGS are the arguments to the function.
3350 They have already been semantically analyzed. */
3353 build_offset_ref_call_from_tree (tree fn, tree args)
3362 object = TREE_OPERAND (fn, 0);
3364 if (processing_template_decl)
3366 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3367 || TREE_CODE (fn) == MEMBER_REF);
3368 if (type_dependent_expression_p (fn)
3369 || any_type_dependent_arguments_p (args))
3370 return build_nt_call_list (fn, args);
3372 /* Transform the arguments and add the implicit "this"
3373 parameter. That must be done before the FN is transformed
3374 because we depend on the form of FN. */
3375 args = build_non_dependent_args (args);
3376 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3377 object = build_unary_op (ADDR_EXPR, object, 0);
3378 object = build_non_dependent_expr (object);
3379 args = tree_cons (NULL_TREE, object, args);
3380 /* Now that the arguments are done, transform FN. */
3381 fn = build_non_dependent_expr (fn);
3384 /* A qualified name corresponding to a bound pointer-to-member is
3385 represented as an OFFSET_REF:
3387 struct B { void g(); };
3389 void B::g() { (this->*p)(); } */
3390 if (TREE_CODE (fn) == OFFSET_REF)
3392 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3393 fn = TREE_OPERAND (fn, 1);
3394 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3395 args = tree_cons (NULL_TREE, object_addr, args);
3398 expr = build_function_call (fn, args);
3399 if (processing_template_decl && expr != error_mark_node)
3400 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3406 check_default_args (tree x)
3408 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3409 bool saw_def = false;
3410 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3411 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3413 if (TREE_PURPOSE (arg))
3417 error ("default argument missing for parameter %P of %q+#D", i, x);
3418 TREE_PURPOSE (arg) = error_mark_node;
3423 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3424 If DECL is a specialization or implicitly declared class member,
3425 generate the actual definition. */
3428 mark_used (tree decl)
3430 HOST_WIDE_INT saved_processing_template_decl = 0;
3432 /* If DECL is a BASELINK for a single function, then treat it just
3433 like the DECL for the function. Otherwise, if the BASELINK is
3434 for an overloaded function, we don't know which function was
3435 actually used until after overload resolution. */
3436 if (TREE_CODE (decl) == BASELINK)
3438 decl = BASELINK_FUNCTIONS (decl);
3439 if (really_overloaded_fn (decl))
3441 decl = OVL_CURRENT (decl);
3444 TREE_USED (decl) = 1;
3445 if (DECL_CLONED_FUNCTION_P (decl))
3446 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3447 /* If we don't need a value, then we don't need to synthesize DECL. */
3448 if (skip_evaluation)
3450 /* Normally, we can wait until instantiation-time to synthesize
3451 DECL. However, if DECL is a static data member initialized with
3452 a constant, we need the value right now because a reference to
3453 such a data member is not value-dependent. */
3454 if (TREE_CODE (decl) == VAR_DECL
3455 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3456 && DECL_CLASS_SCOPE_P (decl))
3458 /* Don't try to instantiate members of dependent types. We
3459 cannot just use dependent_type_p here because this function
3460 may be called from fold_non_dependent_expr, and then we may
3461 see dependent types, even though processing_template_decl
3463 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3464 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3466 /* Pretend that we are not in a template, even if we are, so
3467 that the static data member initializer will be processed. */
3468 saved_processing_template_decl = processing_template_decl;
3469 processing_template_decl = 0;
3472 if (processing_template_decl)
3475 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3476 && !TREE_ASM_WRITTEN (decl))
3477 /* Remember it, so we can check it was defined. */
3479 if (DECL_DEFERRED_FN (decl))
3482 /* Remember the current location for a function we will end up
3483 synthesizing. Then we can inform the user where it was
3484 required in the case of error. */
3485 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3486 && !DECL_THUNK_P (decl))
3487 DECL_SOURCE_LOCATION (decl) = input_location;
3489 note_vague_linkage_fn (decl);
3492 assemble_external (decl);
3494 /* Is it a synthesized method that needs to be synthesized? */
3495 if (TREE_CODE (decl) == FUNCTION_DECL
3496 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3497 && DECL_ARTIFICIAL (decl)
3498 && !DECL_THUNK_P (decl)
3499 && ! DECL_INITIAL (decl)
3500 /* Kludge: don't synthesize for default args. Unfortunately this
3501 rules out initializers of namespace-scoped objects too, but
3502 it's sort-of ok if the implicit ctor or dtor decl keeps
3503 pointing to the class location. */
3504 && current_function_decl)
3506 synthesize_method (decl);
3507 /* If we've already synthesized the method we don't need to
3508 do the instantiation test below. */
3510 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3511 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3512 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3513 || (TREE_CODE (decl) == FUNCTION_DECL
3514 && DECL_INLINE (DECL_TEMPLATE_RESULT
3515 (template_for_substitution (decl))))
3516 /* We need to instantiate static data members so that there
3517 initializers are available in integral constant
3519 || (TREE_CODE (decl) == VAR_DECL
3520 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3521 /* If this is a function or variable that is an instance of some
3522 template, we now know that we will need to actually do the
3523 instantiation. We check that DECL is not an explicit
3524 instantiation because that is not checked in instantiate_decl.
3526 We put off instantiating functions in order to improve compile
3527 times. Maintaining a stack of active functions is expensive,
3528 and the inliner knows to instantiate any functions it might
3529 need. Therefore, we always try to defer instantiation. */
3530 instantiate_decl (decl, /*defer_ok=*/true,
3531 /*expl_inst_class_mem_p=*/false);
3533 processing_template_decl = saved_processing_template_decl;
3536 #include "gt-cp-decl2.h"