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, 2008 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 (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL, tf_warning_or_error);
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 && MAYBE_CLASS_TYPE_P (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 permerror ("local class %q#T shall not have static data member %q#D",
720 current_class_type, decl);
722 /* Static consts need not be initialized in the class definition. */
723 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
725 static int explained = 0;
727 error ("initializer invalid for static member with constructor");
730 error ("(an out of class initialization is required)");
735 /* Force the compiler to know when an uninitialized static const
736 member is being used. */
737 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
738 TREE_USED (decl) = 1;
739 DECL_INITIAL (decl) = init;
740 DECL_IN_AGGR_P (decl) = 1;
742 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
745 /* DECLARATOR and DECLSPECS correspond to a class member. The other
746 parameters are as for cp_finish_decl. Return the DECL for the
747 class member declared. */
750 grokfield (const cp_declarator *declarator,
751 cp_decl_specifier_seq *declspecs,
752 tree init, bool init_const_expr_p,
757 const char *asmspec = 0;
758 int flags = LOOKUP_ONLYCONVERTING;
761 && TREE_CODE (init) == TREE_LIST
762 && TREE_VALUE (init) == error_mark_node
763 && TREE_CHAIN (init) == NULL_TREE)
766 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
767 if (! value || error_operand_p (value))
768 /* friend or constructor went bad. */
769 return error_mark_node;
771 if (TREE_CODE (value) == TYPE_DECL && init)
773 error ("typedef %qD is initialized (use __typeof__ instead)", value);
777 /* Pass friendly classes back. */
778 if (value == void_type_node)
781 /* Pass friend decls back. */
782 if ((TREE_CODE (value) == FUNCTION_DECL
783 || TREE_CODE (value) == TEMPLATE_DECL)
784 && DECL_CONTEXT (value) != current_class_type)
787 if (DECL_NAME (value) != NULL_TREE
788 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
789 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
790 error ("member %qD conflicts with virtual function table field name",
793 /* Stash away type declarations. */
794 if (TREE_CODE (value) == TYPE_DECL)
796 DECL_NONLOCAL (value) = 1;
797 DECL_CONTEXT (value) = current_class_type;
799 if (processing_template_decl)
800 value = push_template_decl (value);
803 cplus_decl_attributes (&value, attrlist, 0);
808 if (DECL_IN_AGGR_P (value))
810 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
811 return void_type_node;
814 if (asmspec_tree && asmspec_tree != error_mark_node)
815 asmspec = TREE_STRING_POINTER (asmspec_tree);
819 if (TREE_CODE (value) == FUNCTION_DECL)
821 /* Initializers for functions are rejected early in the parser.
822 If we get here, it must be a pure specifier for a method. */
823 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
825 gcc_assert (error_operand_p (init) || integer_zerop (init));
826 DECL_PURE_VIRTUAL_P (value) = 1;
830 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
831 error ("initializer specified for static member function %qD",
835 else if (pedantic && TREE_CODE (value) != VAR_DECL)
836 /* Already complained in grokdeclarator. */
838 else if (!processing_template_decl)
840 if (TREE_CODE (init) == CONSTRUCTOR)
841 init = digest_init (TREE_TYPE (value), init);
843 init = integral_constant_value (init);
845 if (init != error_mark_node && !TREE_CONSTANT (init))
847 /* We can allow references to things that are effectively
848 static, since references are initialized with the
850 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
851 || (TREE_STATIC (init) == 0
852 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
854 error ("field initializer is not constant");
855 init = error_mark_node;
861 if (processing_template_decl
862 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
864 value = push_template_decl (value);
865 if (error_operand_p (value))
866 return error_mark_node;
870 cplus_decl_attributes (&value, attrlist, 0);
872 switch (TREE_CODE (value))
875 finish_static_data_member_decl (value, init, init_const_expr_p,
876 asmspec_tree, flags);
881 error ("%<asm%> specifiers are not permitted on non-static data members");
882 if (DECL_INITIAL (value) == error_mark_node)
883 init = error_mark_node;
884 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
886 DECL_INITIAL (value) = init;
887 DECL_IN_AGGR_P (value) = 1;
892 set_user_assembler_name (value, asmspec);
894 cp_finish_decl (value,
896 /*init_const_expr_p=*/false,
897 asmspec_tree, flags);
899 /* Pass friends back this way. */
900 if (DECL_FRIEND_P (value))
901 return void_type_node;
903 DECL_IN_AGGR_P (value) = 1;
912 /* Like `grokfield', but for bitfields.
913 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
916 grokbitfield (const cp_declarator *declarator,
917 cp_decl_specifier_seq *declspecs, tree width,
920 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
922 if (value == error_mark_node)
923 return NULL_TREE; /* friends went bad. */
925 /* Pass friendly classes back. */
926 if (TREE_CODE (value) == VOID_TYPE)
927 return void_type_node;
929 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
930 && (POINTER_TYPE_P (value)
931 || !dependent_type_p (TREE_TYPE (value))))
933 error ("bit-field %qD with non-integral type", value);
934 return error_mark_node;
937 if (TREE_CODE (value) == TYPE_DECL)
939 error ("cannot declare %qD to be a bit-field type", value);
943 /* Usually, finish_struct_1 catches bitfields with invalid types.
944 But, in the case of bitfields with function type, we confuse
945 ourselves into thinking they are member functions, so we must
947 if (TREE_CODE (value) == FUNCTION_DECL)
949 error ("cannot declare bit-field %qD with function type",
954 if (DECL_IN_AGGR_P (value))
956 error ("%qD is already defined in the class %qT", value,
957 DECL_CONTEXT (value));
958 return void_type_node;
961 if (TREE_STATIC (value))
963 error ("static member %qD cannot be a bit-field", value);
966 finish_decl (value, NULL_TREE, NULL_TREE);
968 if (width != error_mark_node)
970 constant_expression_warning (width);
971 DECL_INITIAL (value) = width;
972 SET_DECL_C_BIT_FIELD (value);
975 DECL_IN_AGGR_P (value) = 1;
978 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
984 /* Returns true iff ATTR is an attribute which needs to be applied at
985 instantiation time rather than template definition time. */
988 is_late_template_attribute (tree attr, tree decl)
990 tree name = TREE_PURPOSE (attr);
991 tree args = TREE_VALUE (attr);
992 const struct attribute_spec *spec = lookup_attribute_spec (name);
996 /* Unknown attribute. */
999 /* Attribute weak handling wants to write out assembly right away. */
1000 if (is_attribute_p ("weak", name))
1003 /* If any of the arguments are dependent expressions, we can't evaluate
1004 the attribute until instantiation time. */
1005 for (arg = args; arg; arg = TREE_CHAIN (arg))
1007 tree t = TREE_VALUE (arg);
1008 if (value_dependent_expression_p (t)
1009 || type_dependent_expression_p (t))
1013 if (TREE_CODE (decl) == TYPE_DECL
1015 || spec->type_required)
1017 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1019 /* We can't apply any attributes to a completely unknown type until
1020 instantiation time. */
1021 enum tree_code code = TREE_CODE (type);
1022 if (code == TEMPLATE_TYPE_PARM
1023 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1024 || code == TYPENAME_TYPE)
1026 /* Also defer most attributes on dependent types. This is not
1027 necessary in all cases, but is the better default. */
1028 else if (dependent_type_p (type)
1029 /* But attribute visibility specifically works on
1031 && !is_attribute_p ("visibility", name))
1040 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1041 applied at instantiation time and return them. If IS_DEPENDENT is true,
1042 the declaration itself is dependent, so all attributes should be applied
1043 at instantiation time. */
1046 splice_template_attributes (tree *attr_p, tree decl)
1049 tree late_attrs = NULL_TREE;
1050 tree *q = &late_attrs;
1057 if (is_late_template_attribute (*p, decl))
1059 ATTR_IS_DEPENDENT (*p) = 1;
1061 *p = TREE_CHAIN (*p);
1062 q = &TREE_CHAIN (*q);
1066 p = &TREE_CHAIN (*p);
1072 /* Remove any late attributes from the list in ATTR_P and attach them to
1076 save_template_attributes (tree *attr_p, tree *decl_p)
1078 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1080 tree old_attrs = NULL_TREE;
1085 /* Give this type a name so we know to look it up again at instantiation
1087 if (TREE_CODE (*decl_p) == TYPE_DECL
1088 && DECL_ORIGINAL_TYPE (*decl_p) == NULL_TREE)
1090 tree oldt = TREE_TYPE (*decl_p);
1091 tree newt = build_variant_type_copy (oldt);
1092 DECL_ORIGINAL_TYPE (*decl_p) = oldt;
1093 TREE_TYPE (*decl_p) = newt;
1094 TYPE_NAME (newt) = *decl_p;
1095 TREE_USED (newt) = TREE_USED (*decl_p);
1098 if (DECL_P (*decl_p))
1099 q = &DECL_ATTRIBUTES (*decl_p);
1101 q = &TYPE_ATTRIBUTES (*decl_p);
1105 /* Place the late attributes at the beginning of the attribute
1107 TREE_CHAIN (tree_last (late_attrs)) = *q;
1110 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1112 /* We've added new attributes directly to the main variant, so
1113 now we need to update all of the other variants to include
1114 these new attributes. */
1116 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1117 variant = TYPE_NEXT_VARIANT (variant))
1119 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1120 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1125 /* Like reconstruct_complex_type, but handle also template trees. */
1128 cp_reconstruct_complex_type (tree type, tree bottom)
1132 if (TREE_CODE (type) == POINTER_TYPE)
1134 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1135 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1136 TYPE_REF_CAN_ALIAS_ALL (type));
1138 else if (TREE_CODE (type) == REFERENCE_TYPE)
1140 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1141 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1142 TYPE_REF_CAN_ALIAS_ALL (type));
1144 else if (TREE_CODE (type) == ARRAY_TYPE)
1146 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1147 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1148 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1149 element type qualification will be handled by the recursive
1150 cp_reconstruct_complex_type call and cp_build_qualified_type
1151 for ARRAY_TYPEs changes the element type. */
1154 else if (TREE_CODE (type) == FUNCTION_TYPE)
1156 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1157 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1159 else if (TREE_CODE (type) == METHOD_TYPE)
1161 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1162 /* The build_method_type_directly() routine prepends 'this' to argument list,
1163 so we must compensate by getting rid of it. */
1165 = build_method_type_directly
1166 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1168 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1170 else if (TREE_CODE (type) == OFFSET_TYPE)
1172 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1173 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1178 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1181 /* Like decl_attributes, but handle C++ complexity. */
1184 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1186 if (*decl == NULL_TREE || *decl == void_type_node
1187 || *decl == error_mark_node
1188 || attributes == NULL_TREE)
1191 if (processing_template_decl)
1193 if (check_for_bare_parameter_packs (attributes))
1196 save_template_attributes (&attributes, decl);
1197 if (attributes == NULL_TREE)
1201 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1202 decl = &DECL_TEMPLATE_RESULT (*decl);
1204 decl_attributes (decl, attributes, flags);
1206 if (TREE_CODE (*decl) == TYPE_DECL)
1207 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1210 /* Walks through the namespace- or function-scope anonymous union
1211 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1212 Returns one of the fields for use in the mangled name. */
1215 build_anon_union_vars (tree type, tree object)
1217 tree main_decl = NULL_TREE;
1220 /* Rather than write the code to handle the non-union case,
1221 just give an error. */
1222 if (TREE_CODE (type) != UNION_TYPE)
1223 error ("anonymous struct not inside named type");
1225 for (field = TYPE_FIELDS (type);
1227 field = TREE_CHAIN (field))
1232 if (DECL_ARTIFICIAL (field))
1234 if (TREE_CODE (field) != FIELD_DECL)
1236 permerror ("%q+#D invalid; an anonymous union can only "
1237 "have non-static data members", field);
1241 if (TREE_PRIVATE (field))
1242 permerror ("private member %q+#D in anonymous union", field);
1243 else if (TREE_PROTECTED (field))
1244 permerror ("protected member %q+#D in anonymous union", field);
1246 if (processing_template_decl)
1247 ref = build_min_nt (COMPONENT_REF, object,
1248 DECL_NAME (field), NULL_TREE);
1250 ref = build_class_member_access_expr (object, field, NULL_TREE,
1251 false, tf_warning_or_error);
1253 if (DECL_NAME (field))
1257 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1258 DECL_ANON_UNION_VAR_P (decl) = 1;
1260 base = get_base_address (object);
1261 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1262 TREE_STATIC (decl) = TREE_STATIC (base);
1263 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1265 SET_DECL_VALUE_EXPR (decl, ref);
1266 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1268 decl = pushdecl (decl);
1270 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1271 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1275 if (main_decl == NULL_TREE)
1282 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1283 anonymous union, then all members must be laid out together. PUBLIC_P
1284 is nonzero if this union is not declared static. */
1287 finish_anon_union (tree anon_union_decl)
1293 if (anon_union_decl == error_mark_node)
1296 type = TREE_TYPE (anon_union_decl);
1297 public_p = TREE_PUBLIC (anon_union_decl);
1299 /* The VAR_DECL's context is the same as the TYPE's context. */
1300 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1302 if (TYPE_FIELDS (type) == NULL_TREE)
1307 error ("namespace-scope anonymous aggregates must be static");
1311 main_decl = build_anon_union_vars (type, anon_union_decl);
1312 if (main_decl == error_mark_node)
1314 if (main_decl == NULL_TREE)
1316 warning (0, "anonymous union with no members");
1320 if (!processing_template_decl)
1322 /* Use main_decl to set the mangled name. */
1323 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1324 mangle_decl (anon_union_decl);
1325 DECL_NAME (anon_union_decl) = NULL_TREE;
1328 pushdecl (anon_union_decl);
1329 if (building_stmt_tree ()
1330 && at_function_scope_p ())
1331 add_decl_expr (anon_union_decl);
1332 else if (!processing_template_decl)
1333 rest_of_decl_compilation (anon_union_decl,
1334 toplevel_bindings_p (), at_eof);
1337 /* Auxiliary functions to make type signatures for
1338 `operator new' and `operator delete' correspond to
1339 what compiler will be expecting. */
1342 coerce_new_type (tree type)
1345 tree args = TYPE_ARG_TYPES (type);
1347 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1349 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1352 error ("%<operator new%> must return type %qT", ptr_type_node);
1355 if (args && args != void_list_node)
1357 if (TREE_PURPOSE (args))
1359 /* [basic.stc.dynamic.allocation]
1361 The first parameter shall not have an associated default
1363 error ("the first parameter of %<operator new%> cannot "
1364 "have a default argument");
1365 /* Throw away the default argument. */
1366 TREE_PURPOSE (args) = NULL_TREE;
1369 if (!same_type_p (TREE_VALUE (args), size_type_node))
1372 args = TREE_CHAIN (args);
1379 permerror ("%<operator new%> takes type %<size_t%> (%qT) "
1380 "as first parameter", size_type_node);
1385 args = tree_cons (NULL_TREE, size_type_node, args);
1388 type = build_exception_variant
1389 (build_function_type (ptr_type_node, args),
1390 TYPE_RAISES_EXCEPTIONS (type));
1398 coerce_delete_type (tree type)
1401 tree args = TYPE_ARG_TYPES (type);
1403 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1405 if (!same_type_p (TREE_TYPE (type), void_type_node))
1408 error ("%<operator delete%> must return type %qT", void_type_node);
1411 if (!args || args == void_list_node
1412 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1415 if (args && args != void_list_node)
1416 args = TREE_CHAIN (args);
1417 error ("%<operator delete%> takes type %qT as first parameter",
1423 args = tree_cons (NULL_TREE, ptr_type_node, args);
1426 type = build_exception_variant
1427 (build_function_type (void_type_node, args),
1428 TYPE_RAISES_EXCEPTIONS (type));
1436 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1437 and mark them as needed. */
1440 mark_vtable_entries (tree decl)
1443 unsigned HOST_WIDE_INT idx;
1445 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1450 STRIP_NOPS (fnaddr);
1452 if (TREE_CODE (fnaddr) != ADDR_EXPR
1453 && TREE_CODE (fnaddr) != FDESC_EXPR)
1454 /* This entry is an offset: a virtual base class offset, a
1455 virtual call offset, an RTTI offset, etc. */
1458 fn = TREE_OPERAND (fnaddr, 0);
1459 TREE_ADDRESSABLE (fn) = 1;
1460 /* When we don't have vcall offsets, we output thunks whenever
1461 we output the vtables that contain them. With vcall offsets,
1462 we know all the thunks we'll need when we emit a virtual
1463 function, so we emit the thunks there instead. */
1464 if (DECL_THUNK_P (fn))
1465 use_thunk (fn, /*emit_p=*/0);
1470 /* Set DECL up to have the closest approximation of "initialized common"
1471 linkage available. */
1474 comdat_linkage (tree decl)
1477 make_decl_one_only (decl);
1478 else if (TREE_CODE (decl) == FUNCTION_DECL
1479 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1480 /* We can just emit function and compiler-generated variables
1481 statically; having multiple copies is (for the most part) only
1484 There are two correctness issues, however: the address of a
1485 template instantiation with external linkage should be the
1486 same, independent of what translation unit asks for the
1487 address, and this will not hold when we emit multiple copies of
1488 the function. However, there's little else we can do.
1490 Also, by default, the typeinfo implementation assumes that
1491 there will be only one copy of the string used as the name for
1492 each type. Therefore, if weak symbols are unavailable, the
1493 run-time library should perform a more conservative check; it
1494 should perform a string comparison, rather than an address
1496 TREE_PUBLIC (decl) = 0;
1499 /* Static data member template instantiations, however, cannot
1500 have multiple copies. */
1501 if (DECL_INITIAL (decl) == 0
1502 || DECL_INITIAL (decl) == error_mark_node)
1503 DECL_COMMON (decl) = 1;
1504 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1506 DECL_COMMON (decl) = 1;
1507 DECL_INITIAL (decl) = error_mark_node;
1509 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1511 /* We can't do anything useful; leave vars for explicit
1513 DECL_EXTERNAL (decl) = 1;
1514 DECL_NOT_REALLY_EXTERN (decl) = 0;
1518 if (DECL_LANG_SPECIFIC (decl))
1519 DECL_COMDAT (decl) = 1;
1522 /* For win32 we also want to put explicit instantiations in
1523 linkonce sections, so that they will be merged with implicit
1524 instantiations; otherwise we get duplicate symbol errors.
1525 For Darwin we do not want explicit instantiations to be
1529 maybe_make_one_only (tree decl)
1531 /* We used to say that this was not necessary on targets that support weak
1532 symbols, because the implicit instantiations will defer to the explicit
1533 one. However, that's not actually the case in SVR4; a strong definition
1534 after a weak one is an error. Also, not making explicit
1535 instantiations one_only means that we can end up with two copies of
1536 some template instantiations. */
1540 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1541 we can get away with not emitting them if they aren't used. We need
1542 to for variables so that cp_finish_decl will update their linkage,
1543 because their DECL_INITIAL may not have been set properly yet. */
1545 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1546 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1547 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1549 make_decl_one_only (decl);
1551 if (TREE_CODE (decl) == VAR_DECL)
1553 DECL_COMDAT (decl) = 1;
1554 /* Mark it needed so we don't forget to emit it. */
1555 mark_decl_referenced (decl);
1560 /* Determine whether or not we want to specifically import or export CTYPE,
1561 using various heuristics. */
1564 import_export_class (tree ctype)
1566 /* -1 for imported, 1 for exported. */
1567 int import_export = 0;
1569 /* It only makes sense to call this function at EOF. The reason is
1570 that this function looks at whether or not the first non-inline
1571 non-abstract virtual member function has been defined in this
1572 translation unit. But, we can't possibly know that until we've
1573 seen the entire translation unit. */
1574 gcc_assert (at_eof);
1576 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1579 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1580 we will have CLASSTYPE_INTERFACE_ONLY set but not
1581 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1582 heuristic because someone will supply a #pragma implementation
1583 elsewhere, and deducing it here would produce a conflict. */
1584 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1587 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1589 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1591 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1592 && !flag_implicit_templates)
1593 /* For a template class, without -fimplicit-templates, check the
1594 repository. If the virtual table is assigned to this
1595 translation unit, then export the class; otherwise, import
1597 import_export = repo_export_class_p (ctype) ? 1 : -1;
1598 else if (TYPE_POLYMORPHIC_P (ctype))
1600 /* The ABI specifies that the virtual table and associated
1601 information are emitted with the key method, if any. */
1602 tree method = CLASSTYPE_KEY_METHOD (ctype);
1603 /* If weak symbol support is not available, then we must be
1604 careful not to emit the vtable when the key function is
1605 inline. An inline function can be defined in multiple
1606 translation units. If we were to emit the vtable in each
1607 translation unit containing a definition, we would get
1608 multiple definition errors at link-time. */
1609 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1610 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1613 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1614 a definition anywhere else. */
1615 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1618 /* Allow back ends the chance to overrule the decision. */
1619 if (targetm.cxx.import_export_class)
1620 import_export = targetm.cxx.import_export_class (ctype, import_export);
1624 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1625 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1629 /* Return true if VAR has already been provided to the back end; in that
1630 case VAR should not be modified further by the front end. */
1632 var_finalized_p (tree var)
1634 return varpool_node (var)->finalized;
1637 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1638 must be emitted in this translation unit. Mark it as such. */
1641 mark_needed (tree decl)
1643 /* It's possible that we no longer need to set
1644 TREE_SYMBOL_REFERENCED here directly, but doing so is
1646 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1647 mark_decl_referenced (decl);
1650 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1651 returns true if a definition of this entity should be provided in
1652 this object file. Callers use this function to determine whether
1653 or not to let the back end know that a definition of DECL is
1654 available in this translation unit. */
1657 decl_needed_p (tree decl)
1659 gcc_assert (TREE_CODE (decl) == VAR_DECL
1660 || TREE_CODE (decl) == FUNCTION_DECL);
1661 /* This function should only be called at the end of the translation
1662 unit. We cannot be sure of whether or not something will be
1663 COMDAT until that point. */
1664 gcc_assert (at_eof);
1666 /* All entities with external linkage that are not COMDAT should be
1667 emitted; they may be referred to from other object files. */
1668 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1670 /* If this entity was used, let the back end see it; it will decide
1671 whether or not to emit it into the object file. */
1672 if (TREE_USED (decl)
1673 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1674 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1676 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1677 reference to DECL might cause it to be emitted later. */
1681 /* If necessary, write out the vtables for the dynamic class CTYPE.
1682 Returns true if any vtables were emitted. */
1685 maybe_emit_vtables (tree ctype)
1691 /* If the vtables for this class have already been emitted there is
1692 nothing more to do. */
1693 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1694 if (var_finalized_p (primary_vtbl))
1696 /* Ignore dummy vtables made by get_vtable_decl. */
1697 if (TREE_TYPE (primary_vtbl) == void_type_node)
1700 /* On some targets, we cannot determine the key method until the end
1701 of the translation unit -- which is when this function is
1703 if (!targetm.cxx.key_method_may_be_inline ())
1704 determine_key_method (ctype);
1706 /* See if any of the vtables are needed. */
1707 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1709 import_export_decl (vtbl);
1710 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1715 /* If the references to this class' vtables are optimized away,
1716 still emit the appropriate debugging information. See
1718 if (DECL_COMDAT (primary_vtbl)
1719 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1720 note_debug_info_needed (ctype);
1724 /* The ABI requires that we emit all of the vtables if we emit any
1726 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1728 /* Mark entities references from the virtual table as used. */
1729 mark_vtable_entries (vtbl);
1731 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1733 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1735 /* It had better be all done at compile-time. */
1740 DECL_EXTERNAL (vtbl) = 0;
1741 rest_of_decl_compilation (vtbl, 1, 1);
1743 /* Because we're only doing syntax-checking, we'll never end up
1744 actually marking the variable as written. */
1745 if (flag_syntax_only)
1746 TREE_ASM_WRITTEN (vtbl) = 1;
1749 /* Since we're writing out the vtable here, also write the debug
1751 note_debug_info_needed (ctype);
1756 /* A special return value from type_visibility meaning internal
1759 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1761 /* walk_tree helper function for type_visibility. */
1764 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1766 int *vis_p = (int *)data;
1771 else if (CLASS_TYPE_P (*tp))
1773 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1775 *vis_p = VISIBILITY_ANON;
1778 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1779 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1784 /* Returns the visibility of TYPE, which is the minimum visibility of its
1788 type_visibility (tree type)
1790 int vis = VISIBILITY_DEFAULT;
1791 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1795 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1796 specified (or if VISIBILITY is static). */
1799 constrain_visibility (tree decl, int visibility)
1801 if (visibility == VISIBILITY_ANON)
1803 /* extern "C" declarations aren't affected by the anonymous
1805 if (!DECL_EXTERN_C_P (decl))
1807 TREE_PUBLIC (decl) = 0;
1808 DECL_ONE_ONLY (decl) = 0;
1809 DECL_INTERFACE_KNOWN (decl) = 1;
1810 if (DECL_LANG_SPECIFIC (decl))
1811 DECL_NOT_REALLY_EXTERN (decl) = 1;
1814 else if (visibility > DECL_VISIBILITY (decl)
1815 && !DECL_VISIBILITY_SPECIFIED (decl))
1817 DECL_VISIBILITY (decl) = visibility;
1823 /* Constrain the visibility of DECL based on the visibility of its template
1827 constrain_visibility_for_template (tree decl, tree targs)
1829 /* If this is a template instantiation, check the innermost
1830 template args for visibility constraints. The outer template
1831 args are covered by the class check. */
1832 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1834 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1838 tree arg = TREE_VEC_ELT (args, i-1);
1840 vis = type_visibility (arg);
1841 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1844 if (TREE_CODE (arg) == ADDR_EXPR)
1845 arg = TREE_OPERAND (arg, 0);
1846 if (TREE_CODE (arg) == VAR_DECL
1847 || TREE_CODE (arg) == FUNCTION_DECL)
1849 if (! TREE_PUBLIC (arg))
1850 vis = VISIBILITY_ANON;
1852 vis = DECL_VISIBILITY (arg);
1856 constrain_visibility (decl, vis);
1860 /* Like c_determine_visibility, but with additional C++-specific
1863 Function-scope entities can rely on the function's visibility because
1864 it is set in start_preparsed_function.
1866 Class-scope entities cannot rely on the class's visibility until the end
1867 of the enclosing class definition.
1869 Note that because namespaces have multiple independent definitions,
1870 namespace visibility is handled elsewhere using the #pragma visibility
1871 machinery rather than by decorating the namespace declaration.
1873 The goal is for constraints from the type to give a diagnostic, and
1874 other constraints to be applied silently. */
1877 determine_visibility (tree decl)
1879 tree class_type = NULL_TREE;
1882 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1884 /* Only relevant for names with external linkage. */
1885 if (!TREE_PUBLIC (decl))
1888 /* Cloned constructors and destructors get the same visibility as
1889 the underlying function. That should be set up in
1890 maybe_clone_body. */
1891 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1893 if (TREE_CODE (decl) == TYPE_DECL)
1895 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1896 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1897 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1902 else if (DECL_LANG_SPECIFIC (decl))
1903 use_template = DECL_USE_TEMPLATE (decl);
1907 /* If DECL is a member of a class, visibility specifiers on the
1908 class can influence the visibility of the DECL. */
1909 if (DECL_CLASS_SCOPE_P (decl))
1910 class_type = DECL_CONTEXT (decl);
1913 /* Not a class member. */
1915 /* Virtual tables have DECL_CONTEXT set to their associated class,
1916 so they are automatically handled above. */
1917 gcc_assert (TREE_CODE (decl) != VAR_DECL
1918 || !DECL_VTABLE_OR_VTT_P (decl));
1920 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1922 /* Local statics and classes get the visibility of their
1923 containing function by default, except that
1924 -fvisibility-inlines-hidden doesn't affect them. */
1925 tree fn = DECL_CONTEXT (decl);
1926 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1928 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1929 DECL_VISIBILITY_SPECIFIED (decl) =
1930 DECL_VISIBILITY_SPECIFIED (fn);
1933 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1935 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1936 but have no TEMPLATE_INFO, so don't try to check it. */
1939 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1940 && flag_visibility_ms_compat)
1942 /* Under -fvisibility-ms-compat, types are visible by default,
1943 even though their contents aren't. */
1944 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1945 int underlying_vis = type_visibility (underlying_type);
1946 if (underlying_vis == VISIBILITY_ANON
1947 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1948 constrain_visibility (decl, underlying_vis);
1950 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1952 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1954 /* tinfo visibility is based on the type it's for. */
1955 constrain_visibility
1956 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1958 else if (use_template)
1959 /* Template instantiations and specializations get visibility based
1960 on their template unless they override it with an attribute. */;
1961 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1963 /* Set default visibility to whatever the user supplied with
1964 #pragma GCC visibility or a namespace visibility attribute. */
1965 DECL_VISIBILITY (decl) = default_visibility;
1966 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1972 /* If the specialization doesn't specify visibility, use the
1973 visibility from the template. */
1974 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1975 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1976 : DECL_TEMPLATE_INFO (decl));
1977 tree args = TI_ARGS (tinfo);
1979 if (args != error_mark_node)
1981 int depth = TMPL_ARGS_DEPTH (args);
1982 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1984 if (!DECL_VISIBILITY_SPECIFIED (decl))
1986 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1987 DECL_VISIBILITY_SPECIFIED (decl)
1988 = DECL_VISIBILITY_SPECIFIED (pattern);
1991 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1992 if (args && depth > template_class_depth (class_type))
1993 /* Limit visibility based on its template arguments. */
1994 constrain_visibility_for_template (decl, args);
1999 determine_visibility_from_class (decl, class_type);
2001 if (decl_anon_ns_mem_p (decl))
2002 /* Names in an anonymous namespace get internal linkage.
2003 This might change once we implement export. */
2004 constrain_visibility (decl, VISIBILITY_ANON);
2005 else if (TREE_CODE (decl) != TYPE_DECL)
2007 /* Propagate anonymity from type to decl. */
2008 int tvis = type_visibility (TREE_TYPE (decl));
2009 if (tvis == VISIBILITY_ANON
2010 || ! DECL_VISIBILITY_SPECIFIED (decl))
2011 constrain_visibility (decl, tvis);
2015 /* By default, static data members and function members receive
2016 the visibility of their containing class. */
2019 determine_visibility_from_class (tree decl, tree class_type)
2021 if (DECL_VISIBILITY_SPECIFIED (decl))
2024 if (visibility_options.inlines_hidden
2025 /* Don't do this for inline templates; specializations might not be
2026 inline, and we don't want them to inherit the hidden
2027 visibility. We'll set it here for all inline instantiations. */
2028 && !processing_template_decl
2029 && TREE_CODE (decl) == FUNCTION_DECL
2030 && DECL_DECLARED_INLINE_P (decl)
2031 && (! DECL_LANG_SPECIFIC (decl)
2032 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2033 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2036 /* Default to the class visibility. */
2037 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2038 DECL_VISIBILITY_SPECIFIED (decl)
2039 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2042 /* Give the target a chance to override the visibility associated
2044 if (TREE_CODE (decl) == VAR_DECL
2045 && (DECL_TINFO_P (decl)
2046 || (DECL_VTABLE_OR_VTT_P (decl)
2047 /* Construction virtual tables are not exported because
2048 they cannot be referred to from other object files;
2049 their name is not standardized by the ABI. */
2050 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2051 && TREE_PUBLIC (decl)
2052 && !DECL_REALLY_EXTERN (decl)
2053 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2054 targetm.cxx.determine_class_data_visibility (decl);
2057 /* Constrain the visibility of a class TYPE based on the visibility of its
2058 field types. Warn if any fields require lesser visibility. */
2061 constrain_class_visibility (tree type)
2067 int vis = type_visibility (type);
2069 if (vis == VISIBILITY_ANON
2070 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2073 /* Don't warn about visibility if the class has explicit visibility. */
2074 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2075 vis = VISIBILITY_INTERNAL;
2077 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2078 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2080 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2081 int subvis = type_visibility (ftype);
2083 if (subvis == VISIBILITY_ANON)
2085 if (!in_main_input_context ())
2087 %qT has a field %qD whose type uses the anonymous namespace",
2090 else if (MAYBE_CLASS_TYPE_P (ftype)
2091 && vis < VISIBILITY_HIDDEN
2092 && subvis >= VISIBILITY_HIDDEN)
2093 warning (OPT_Wattributes, "\
2094 %qT declared with greater visibility than the type of its field %qD",
2098 binfo = TYPE_BINFO (type);
2099 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2101 int subvis = type_visibility (TREE_TYPE (t));
2103 if (subvis == VISIBILITY_ANON)
2105 if (!in_main_input_context())
2107 %qT has a base %qT whose type uses the anonymous namespace",
2108 type, TREE_TYPE (t));
2110 else if (vis < VISIBILITY_HIDDEN
2111 && subvis >= VISIBILITY_HIDDEN)
2112 warning (OPT_Wattributes, "\
2113 %qT declared with greater visibility than its base %qT",
2114 type, TREE_TYPE (t));
2118 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2119 for DECL has not already been determined, do so now by setting
2120 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2121 function is called entities with vague linkage whose definitions
2122 are available must have TREE_PUBLIC set.
2124 If this function decides to place DECL in COMDAT, it will set
2125 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2126 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2127 callers defer that decision until it is clear that DECL is actually
2131 import_export_decl (tree decl)
2136 tree class_type = NULL_TREE;
2138 if (DECL_INTERFACE_KNOWN (decl))
2141 /* We cannot determine what linkage to give to an entity with vague
2142 linkage until the end of the file. For example, a virtual table
2143 for a class will be defined if and only if the key method is
2144 defined in this translation unit. As a further example, consider
2145 that when compiling a translation unit that uses PCH file with
2146 "-frepo" it would be incorrect to make decisions about what
2147 entities to emit when building the PCH; those decisions must be
2148 delayed until the repository information has been processed. */
2149 gcc_assert (at_eof);
2150 /* Object file linkage for explicit instantiations is handled in
2151 mark_decl_instantiated. For static variables in functions with
2152 vague linkage, maybe_commonize_var is used.
2154 Therefore, the only declarations that should be provided to this
2155 function are those with external linkage that are:
2157 * implicit instantiations of function templates
2161 * implicit instantiations of static data members of class
2168 Furthermore, all entities that reach this point must have a
2169 definition available in this translation unit.
2171 The following assertions check these conditions. */
2172 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2173 || TREE_CODE (decl) == VAR_DECL);
2174 /* Any code that creates entities with TREE_PUBLIC cleared should
2175 also set DECL_INTERFACE_KNOWN. */
2176 gcc_assert (TREE_PUBLIC (decl));
2177 if (TREE_CODE (decl) == FUNCTION_DECL)
2178 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2179 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2180 || DECL_DECLARED_INLINE_P (decl));
2182 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2183 || DECL_VTABLE_OR_VTT_P (decl)
2184 || DECL_TINFO_P (decl));
2185 /* Check that a definition of DECL is available in this translation
2187 gcc_assert (!DECL_REALLY_EXTERN (decl));
2189 /* Assume that DECL will not have COMDAT linkage. */
2191 /* Assume that DECL will not be imported into this translation
2195 /* See if the repository tells us whether or not to emit DECL in
2196 this translation unit. */
2197 emit_p = repo_emit_p (decl);
2200 else if (emit_p == 1)
2202 /* The repository indicates that this entity should be defined
2203 here. Make sure the back end honors that request. */
2204 if (TREE_CODE (decl) == VAR_DECL)
2206 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2207 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2210 FOR_EACH_CLONE (clone, decl)
2211 mark_needed (clone);
2215 /* Output the definition as an ordinary strong definition. */
2216 DECL_EXTERNAL (decl) = 0;
2217 DECL_INTERFACE_KNOWN (decl) = 1;
2222 /* We have already decided what to do with this DECL; there is no
2223 need to check anything further. */
2225 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2227 class_type = DECL_CONTEXT (decl);
2228 import_export_class (class_type);
2229 if (TYPE_FOR_JAVA (class_type))
2231 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2232 && CLASSTYPE_INTERFACE_ONLY (class_type))
2234 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2235 && !CLASSTYPE_USE_TEMPLATE (class_type)
2236 && CLASSTYPE_KEY_METHOD (class_type)
2237 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2238 /* The ABI requires that all virtual tables be emitted with
2239 COMDAT linkage. However, on systems where COMDAT symbols
2240 don't show up in the table of contents for a static
2241 archive, or on systems without weak symbols (where we
2242 approximate COMDAT linkage by using internal linkage), the
2243 linker will report errors about undefined symbols because
2244 it will not see the virtual table definition. Therefore,
2245 in the case that we know that the virtual table will be
2246 emitted in only one translation unit, we make the virtual
2247 table an ordinary definition with external linkage. */
2248 DECL_EXTERNAL (decl) = 0;
2249 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2251 /* CLASS_TYPE is being exported from this translation unit,
2252 so DECL should be defined here. */
2253 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2254 /* If a class is declared in a header with the "extern
2255 template" extension, then it will not be instantiated,
2256 even in translation units that would normally require
2257 it. Often such classes are explicitly instantiated in
2258 one translation unit. Therefore, the explicit
2259 instantiation must be made visible to other translation
2261 DECL_EXTERNAL (decl) = 0;
2264 /* The generic C++ ABI says that class data is always
2265 COMDAT, even if there is a key function. Some
2266 variants (e.g., the ARM EABI) says that class data
2267 only has COMDAT linkage if the class data might be
2268 emitted in more than one translation unit. When the
2269 key method can be inline and is inline, we still have
2270 to arrange for comdat even though
2271 class_data_always_comdat is false. */
2272 if (!CLASSTYPE_KEY_METHOD (class_type)
2273 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2274 || targetm.cxx.class_data_always_comdat ())
2276 /* The ABI requires COMDAT linkage. Normally, we
2277 only emit COMDAT things when they are needed;
2278 make sure that we realize that this entity is
2285 else if (!flag_implicit_templates
2286 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2291 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2293 tree type = TREE_TYPE (DECL_NAME (decl));
2294 if (CLASS_TYPE_P (type))
2297 import_export_class (type);
2298 if (CLASSTYPE_INTERFACE_KNOWN (type)
2299 && TYPE_POLYMORPHIC_P (type)
2300 && CLASSTYPE_INTERFACE_ONLY (type)
2301 /* If -fno-rtti was specified, then we cannot be sure
2302 that RTTI information will be emitted with the
2303 virtual table of the class, so we must emit it
2304 wherever it is used. */
2309 if (CLASSTYPE_INTERFACE_KNOWN (type)
2310 && !CLASSTYPE_INTERFACE_ONLY (type))
2312 comdat_p = (targetm.cxx.class_data_always_comdat ()
2313 || (CLASSTYPE_KEY_METHOD (type)
2314 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2319 DECL_EXTERNAL (decl) = 0;
2329 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2330 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2332 /* DECL is an implicit instantiation of a function or static
2334 if ((flag_implicit_templates
2335 && !flag_use_repository)
2336 || (flag_implicit_inline_templates
2337 && TREE_CODE (decl) == FUNCTION_DECL
2338 && DECL_DECLARED_INLINE_P (decl)))
2341 /* If we are not implicitly generating templates, then mark
2342 this entity as undefined in this translation unit. */
2345 else if (DECL_FUNCTION_MEMBER_P (decl))
2347 if (!DECL_DECLARED_INLINE_P (decl))
2349 tree ctype = DECL_CONTEXT (decl);
2350 import_export_class (ctype);
2351 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2353 DECL_NOT_REALLY_EXTERN (decl)
2354 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2355 || (DECL_DECLARED_INLINE_P (decl)
2356 && ! flag_implement_inlines
2357 && !DECL_VINDEX (decl)));
2359 if (!DECL_NOT_REALLY_EXTERN (decl))
2360 DECL_EXTERNAL (decl) = 1;
2362 /* Always make artificials weak. */
2363 if (DECL_ARTIFICIAL (decl) && flag_weak)
2366 maybe_make_one_only (decl);
2377 /* If we are importing DECL into this translation unit, mark is
2378 an undefined here. */
2379 DECL_EXTERNAL (decl) = 1;
2380 DECL_NOT_REALLY_EXTERN (decl) = 0;
2384 /* If we decided to put DECL in COMDAT, mark it accordingly at
2386 comdat_linkage (decl);
2389 DECL_INTERFACE_KNOWN (decl) = 1;
2392 /* Return an expression that performs the destruction of DECL, which
2393 must be a VAR_DECL whose type has a non-trivial destructor, or is
2394 an array whose (innermost) elements have a non-trivial destructor. */
2397 build_cleanup (tree decl)
2400 tree type = TREE_TYPE (decl);
2402 /* This function should only be called for declarations that really
2403 require cleanups. */
2404 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2406 /* Treat all objects with destructors as used; the destructor may do
2407 something substantive. */
2410 if (TREE_CODE (type) == ARRAY_TYPE)
2413 temp = build_address (decl);
2414 temp = build_delete (TREE_TYPE (temp), temp,
2415 sfk_complete_destructor,
2416 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2420 /* Returns the initialization guard variable for the variable DECL,
2421 which has static storage duration. */
2424 get_guard (tree decl)
2429 sname = mangle_guard_variable (decl);
2430 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2435 /* We use a type that is big enough to contain a mutex as well
2436 as an integer counter. */
2437 guard_type = targetm.cxx.guard_type ();
2438 guard = build_decl (VAR_DECL, sname, guard_type);
2440 /* The guard should have the same linkage as what it guards. */
2441 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2442 TREE_STATIC (guard) = TREE_STATIC (decl);
2443 DECL_COMMON (guard) = DECL_COMMON (decl);
2444 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2445 if (TREE_PUBLIC (decl))
2446 DECL_WEAK (guard) = DECL_WEAK (decl);
2447 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2448 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2450 DECL_ARTIFICIAL (guard) = 1;
2451 DECL_IGNORED_P (guard) = 1;
2452 TREE_USED (guard) = 1;
2453 pushdecl_top_level_and_finish (guard, NULL_TREE);
2458 /* Return those bits of the GUARD variable that should be set when the
2459 guarded entity is actually initialized. */
2462 get_guard_bits (tree guard)
2464 if (!targetm.cxx.guard_mask_bit ())
2466 /* We only set the first byte of the guard, in order to leave room
2467 for a mutex in the high-order bits. */
2468 guard = build1 (ADDR_EXPR,
2469 build_pointer_type (TREE_TYPE (guard)),
2471 guard = build1 (NOP_EXPR,
2472 build_pointer_type (char_type_node),
2474 guard = build1 (INDIRECT_REF, char_type_node, guard);
2480 /* Return an expression which determines whether or not the GUARD
2481 variable has already been initialized. */
2484 get_guard_cond (tree guard)
2488 /* Check to see if the GUARD is zero. */
2489 guard = get_guard_bits (guard);
2491 /* Mask off all but the low bit. */
2492 if (targetm.cxx.guard_mask_bit ())
2494 guard_value = integer_one_node;
2495 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2496 guard_value = convert (TREE_TYPE (guard), guard_value);
2497 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value,
2498 tf_warning_or_error);
2501 guard_value = integer_zero_node;
2502 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2503 guard_value = convert (TREE_TYPE (guard), guard_value);
2504 return cp_build_binary_op (EQ_EXPR, guard, guard_value,
2505 tf_warning_or_error);
2508 /* Return an expression which sets the GUARD variable, indicating that
2509 the variable being guarded has been initialized. */
2512 set_guard (tree guard)
2516 /* Set the GUARD to one. */
2517 guard = get_guard_bits (guard);
2518 guard_init = integer_one_node;
2519 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2520 guard_init = convert (TREE_TYPE (guard), guard_init);
2521 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2522 tf_warning_or_error);
2525 /* Start the process of running a particular set of global constructors
2526 or destructors. Subroutine of do_[cd]tors. */
2529 start_objects (int method_type, int initp)
2535 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2537 if (initp != DEFAULT_INIT_PRIORITY)
2547 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2550 sprintf (type, "%c", method_type);
2552 fndecl = build_lang_decl (FUNCTION_DECL,
2553 get_file_function_name (type),
2554 build_function_type (void_type_node,
2556 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2558 TREE_PUBLIC (current_function_decl) = 0;
2560 /* Mark as artificial because it's not explicitly in the user's
2562 DECL_ARTIFICIAL (current_function_decl) = 1;
2564 /* Mark this declaration as used to avoid spurious warnings. */
2565 TREE_USED (current_function_decl) = 1;
2567 /* Mark this function as a global constructor or destructor. */
2568 if (method_type == 'I')
2569 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2571 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2572 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2574 body = begin_compound_stmt (BCS_FN_BODY);
2579 /* Finish the process of running a particular set of global constructors
2580 or destructors. Subroutine of do_[cd]tors. */
2583 finish_objects (int method_type, int initp, tree body)
2588 finish_compound_stmt (body);
2589 fn = finish_function (0);
2591 if (method_type == 'I')
2593 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2594 decl_init_priority_insert (fn, initp);
2598 DECL_STATIC_DESTRUCTOR (fn) = 1;
2599 decl_fini_priority_insert (fn, initp);
2602 expand_or_defer_fn (fn);
2605 /* The names of the parameters to the function created to handle
2606 initializations and destructions for objects with static storage
2608 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2609 #define PRIORITY_IDENTIFIER "__priority"
2611 /* The name of the function we create to handle initializations and
2612 destructions for objects with static storage duration. */
2613 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2615 /* The declaration for the __INITIALIZE_P argument. */
2616 static GTY(()) tree initialize_p_decl;
2618 /* The declaration for the __PRIORITY argument. */
2619 static GTY(()) tree priority_decl;
2621 /* The declaration for the static storage duration function. */
2622 static GTY(()) tree ssdf_decl;
2624 /* All the static storage duration functions created in this
2625 translation unit. */
2626 static GTY(()) VEC(tree,gc) *ssdf_decls;
2628 /* A map from priority levels to information about that priority
2629 level. There may be many such levels, so efficient lookup is
2631 static splay_tree priority_info_map;
2633 /* Begins the generation of the function that will handle all
2634 initialization and destruction of objects with static storage
2635 duration. The function generated takes two parameters of type
2636 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2637 nonzero, it performs initializations. Otherwise, it performs
2638 destructions. It only performs those initializations or
2639 destructions with the indicated __PRIORITY. The generated function
2642 It is assumed that this function will only be called once per
2643 translation unit. */
2646 start_static_storage_duration_function (unsigned count)
2651 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2653 /* Create the identifier for this function. It will be of the form
2654 SSDF_IDENTIFIER_<number>. */
2655 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2657 /* Create the parameters. */
2658 parm_types = void_list_node;
2659 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2660 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2661 type = build_function_type (void_type_node, parm_types);
2663 /* Create the FUNCTION_DECL itself. */
2664 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2665 get_identifier (id),
2667 TREE_PUBLIC (ssdf_decl) = 0;
2668 DECL_ARTIFICIAL (ssdf_decl) = 1;
2669 DECL_INLINE (ssdf_decl) = 1;
2671 /* Put this function in the list of functions to be called from the
2672 static constructors and destructors. */
2675 ssdf_decls = VEC_alloc (tree, gc, 32);
2677 /* Take this opportunity to initialize the map from priority
2678 numbers to information about that priority level. */
2679 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2680 /*delete_key_fn=*/0,
2681 /*delete_value_fn=*/
2682 (splay_tree_delete_value_fn) &free);
2684 /* We always need to generate functions for the
2685 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2686 priorities later, we'll be sure to find the
2687 DEFAULT_INIT_PRIORITY. */
2688 get_priority_info (DEFAULT_INIT_PRIORITY);
2691 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2693 /* Create the argument list. */
2694 initialize_p_decl = cp_build_parm_decl
2695 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2696 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2697 TREE_USED (initialize_p_decl) = 1;
2698 priority_decl = cp_build_parm_decl
2699 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2700 DECL_CONTEXT (priority_decl) = ssdf_decl;
2701 TREE_USED (priority_decl) = 1;
2703 TREE_CHAIN (initialize_p_decl) = priority_decl;
2704 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2706 /* Put the function in the global scope. */
2707 pushdecl (ssdf_decl);
2709 /* Start the function itself. This is equivalent to declaring the
2712 static void __ssdf (int __initialize_p, init __priority_p);
2714 It is static because we only need to call this function from the
2715 various constructor and destructor functions for this module. */
2716 start_preparsed_function (ssdf_decl,
2717 /*attrs=*/NULL_TREE,
2720 /* Set up the scope of the outermost block in the function. */
2721 body = begin_compound_stmt (BCS_FN_BODY);
2726 /* Finish the generation of the function which performs initialization
2727 and destruction of objects with static storage duration. After
2728 this point, no more such objects can be created. */
2731 finish_static_storage_duration_function (tree body)
2733 /* Close out the function. */
2734 finish_compound_stmt (body);
2735 expand_or_defer_fn (finish_function (0));
2738 /* Return the information about the indicated PRIORITY level. If no
2739 code to handle this level has yet been generated, generate the
2740 appropriate prologue. */
2742 static priority_info
2743 get_priority_info (int priority)
2748 n = splay_tree_lookup (priority_info_map,
2749 (splay_tree_key) priority);
2752 /* Create a new priority information structure, and insert it
2754 pi = XNEW (struct priority_info_s);
2755 pi->initializations_p = 0;
2756 pi->destructions_p = 0;
2757 splay_tree_insert (priority_info_map,
2758 (splay_tree_key) priority,
2759 (splay_tree_value) pi);
2762 pi = (priority_info) n->value;
2767 /* The effective initialization priority of a DECL. */
2769 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2770 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2771 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2773 /* Whether a DECL needs a guard to protect it against multiple
2776 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2777 || DECL_ONE_ONLY (decl) \
2778 || DECL_WEAK (decl)))
2780 /* Set up to handle the initialization or destruction of DECL. If
2781 INITP is nonzero, we are initializing the variable. Otherwise, we
2782 are destroying it. */
2785 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2787 tree guard_if_stmt = NULL_TREE;
2790 /* If we are supposed to destruct and there's a trivial destructor,
2791 nothing has to be done. */
2793 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2796 /* Trick the compiler into thinking we are at the file and line
2797 where DECL was declared so that error-messages make sense, and so
2798 that the debugger will show somewhat sensible file and line
2800 input_location = DECL_SOURCE_LOCATION (decl);
2806 Access control for implicit calls to the constructors,
2807 the conversion functions, or the destructor called to
2808 create and destroy a static data member is performed as
2809 if these calls appeared in the scope of the member's
2812 we pretend we are in a static member function of the class of
2813 which the DECL is a member. */
2814 if (member_p (decl))
2816 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2817 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2820 /* Assume we don't need a guard. */
2822 /* We need a guard if this is an object with external linkage that
2823 might be initialized in more than one place. (For example, a
2824 static data member of a template, when the data member requires
2826 if (NEEDS_GUARD_P (decl))
2830 guard = get_guard (decl);
2832 /* When using __cxa_atexit, we just check the GUARD as we would
2833 for a local static. */
2834 if (flag_use_cxa_atexit)
2836 /* When using __cxa_atexit, we never try to destroy
2837 anything from a static destructor. */
2839 guard_cond = get_guard_cond (guard);
2841 /* If we don't have __cxa_atexit, then we will be running
2842 destructors from .fini sections, or their equivalents. So,
2843 we need to know how many times we've tried to initialize this
2844 object. We do initializations only if the GUARD is zero,
2845 i.e., if we are the first to initialize the variable. We do
2846 destructions only if the GUARD is one, i.e., if we are the
2847 last to destroy the variable. */
2850 = cp_build_binary_op (EQ_EXPR,
2851 cp_build_unary_op (PREINCREMENT_EXPR,
2854 tf_warning_or_error),
2856 tf_warning_or_error);
2859 = cp_build_binary_op (EQ_EXPR,
2860 cp_build_unary_op (PREDECREMENT_EXPR,
2863 tf_warning_or_error),
2865 tf_warning_or_error);
2867 guard_if_stmt = begin_if_stmt ();
2868 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2872 /* If we're using __cxa_atexit, we have not already set the GUARD,
2873 so we must do so now. */
2874 if (guard && initp && flag_use_cxa_atexit)
2875 finish_expr_stmt (set_guard (guard));
2877 /* Perform the initialization or destruction. */
2881 finish_expr_stmt (init);
2883 /* If we're using __cxa_atexit, register a function that calls the
2884 destructor for the object. */
2885 if (flag_use_cxa_atexit)
2886 finish_expr_stmt (register_dtor_fn (decl));
2889 finish_expr_stmt (build_cleanup (decl));
2891 /* Finish the guard if-stmt, if necessary. */
2894 finish_then_clause (guard_if_stmt);
2895 finish_if_stmt (guard_if_stmt);
2898 /* Now that we're done with DECL we don't need to pretend to be a
2899 member of its class any longer. */
2900 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2901 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2904 /* Generate code to do the initialization or destruction of the decls in VARS,
2905 a TREE_LIST of VAR_DECL with static storage duration.
2906 Whether initialization or destruction is performed is specified by INITP. */
2909 do_static_initialization_or_destruction (tree vars, bool initp)
2911 tree node, init_if_stmt, cond;
2913 /* Build the outer if-stmt to check for initialization or destruction. */
2914 init_if_stmt = begin_if_stmt ();
2915 cond = initp ? integer_one_node : integer_zero_node;
2916 cond = cp_build_binary_op (EQ_EXPR,
2919 tf_warning_or_error);
2920 finish_if_stmt_cond (cond, init_if_stmt);
2924 tree decl = TREE_VALUE (node);
2925 tree priority_if_stmt;
2929 /* If we don't need a destructor, there's nothing to do. Avoid
2930 creating a possibly empty if-stmt. */
2931 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2933 node = TREE_CHAIN (node);
2937 /* Remember that we had an initialization or finalization at this
2939 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2940 pi = get_priority_info (priority);
2942 pi->initializations_p = 1;
2944 pi->destructions_p = 1;
2946 /* Conditionalize this initialization on being in the right priority
2947 and being initializing/finalizing appropriately. */
2948 priority_if_stmt = begin_if_stmt ();
2949 cond = cp_build_binary_op (EQ_EXPR,
2951 build_int_cst (NULL_TREE, priority),
2952 tf_warning_or_error);
2953 finish_if_stmt_cond (cond, priority_if_stmt);
2955 /* Process initializers with same priority. */
2957 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2958 node = TREE_CHAIN (node))
2959 /* Do one initialization or destruction. */
2960 one_static_initialization_or_destruction (TREE_VALUE (node),
2961 TREE_PURPOSE (node), initp);
2963 /* Finish up the priority if-stmt body. */
2964 finish_then_clause (priority_if_stmt);
2965 finish_if_stmt (priority_if_stmt);
2969 /* Finish up the init/destruct if-stmt body. */
2970 finish_then_clause (init_if_stmt);
2971 finish_if_stmt (init_if_stmt);
2974 /* VARS is a list of variables with static storage duration which may
2975 need initialization and/or finalization. Remove those variables
2976 that don't really need to be initialized or finalized, and return
2977 the resulting list. The order in which the variables appear in
2978 VARS is in reverse order of the order in which they should actually
2979 be initialized. The list we return is in the unreversed order;
2980 i.e., the first variable should be initialized first. */
2983 prune_vars_needing_no_initialization (tree *vars)
2986 tree result = NULL_TREE;
2991 tree decl = TREE_VALUE (t);
2992 tree init = TREE_PURPOSE (t);
2994 /* Deal gracefully with error. */
2995 if (decl == error_mark_node)
2997 var = &TREE_CHAIN (t);
3001 /* The only things that can be initialized are variables. */
3002 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3004 /* If this object is not defined, we don't need to do anything
3006 if (DECL_EXTERNAL (decl))
3008 var = &TREE_CHAIN (t);
3012 /* Also, if the initializer already contains errors, we can bail
3014 if (init && TREE_CODE (init) == TREE_LIST
3015 && value_member (error_mark_node, init))
3017 var = &TREE_CHAIN (t);
3021 /* This variable is going to need initialization and/or
3022 finalization, so we add it to the list. */
3023 *var = TREE_CHAIN (t);
3024 TREE_CHAIN (t) = result;
3031 /* Make sure we have told the back end about all the variables in
3035 write_out_vars (tree vars)
3039 for (v = vars; v; v = TREE_CHAIN (v))
3041 tree var = TREE_VALUE (v);
3042 if (!var_finalized_p (var))
3044 import_export_decl (var);
3045 rest_of_decl_compilation (var, 1, 1);
3050 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3051 (otherwise) that will initialize all global objects with static
3052 storage duration having the indicated PRIORITY. */
3055 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3064 input_location = *locus;
3066 /* Was: locus->line++; */
3068 /* We use `I' to indicate initialization and `D' to indicate
3070 function_key = constructor_p ? 'I' : 'D';
3072 /* We emit the function lazily, to avoid generating empty
3073 global constructors and destructors. */
3076 /* For Objective-C++, we may need to initialize metadata found in this module.
3077 This must be done _before_ any other static initializations. */
3078 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3079 && constructor_p && objc_static_init_needed_p ())
3081 body = start_objects (function_key, priority);
3082 objc_generate_static_init_call (NULL_TREE);
3085 /* Call the static storage duration function with appropriate
3087 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3089 /* Calls to pure or const functions will expand to nothing. */
3090 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3093 body = start_objects (function_key, priority);
3095 arguments = tree_cons (NULL_TREE,
3096 build_int_cst (NULL_TREE, priority),
3098 arguments = tree_cons (NULL_TREE,
3099 build_int_cst (NULL_TREE, constructor_p),
3101 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3102 tf_warning_or_error));
3106 /* Close out the function. */
3108 finish_objects (function_key, priority, body);
3111 /* Generate constructor and destructor functions for the priority
3115 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3117 location_t *locus = (location_t *) data;
3118 int priority = (int) n->key;
3119 priority_info pi = (priority_info) n->value;
3121 /* Generate the functions themselves, but only if they are really
3123 if (pi->initializations_p)
3124 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3125 if (pi->destructions_p)
3126 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3128 /* Keep iterating. */
3132 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3133 decls referenced from front-end specific constructs; it will be called
3134 only for language-specific tree nodes.
3136 Here we must deal with member pointers. */
3139 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3143 switch (TREE_CODE (t))
3146 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3147 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3150 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3151 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3154 if (DECL_VTABLE_OR_VTT_P (t))
3156 /* The ABI requires that all virtual tables be emitted
3157 whenever one of them is. */
3159 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3161 vtbl = TREE_CHAIN (vtbl))
3162 mark_decl_referenced (vtbl);
3164 else if (DECL_CONTEXT (t)
3165 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3166 /* If we need a static variable in a function, then we
3167 need the containing function. */
3168 mark_decl_referenced (DECL_CONTEXT (t));
3177 /* Java requires that we be able to reference a local address for a
3178 method, and not be confused by PLT entries. If hidden aliases are
3179 supported, emit one for each java function that we've emitted. */
3182 build_java_method_aliases (void)
3184 struct cgraph_node *node;
3186 #ifndef HAVE_GAS_HIDDEN
3190 for (node = cgraph_nodes; node ; node = node->next)
3192 tree fndecl = node->decl;
3194 if (TREE_ASM_WRITTEN (fndecl)
3195 && DECL_CONTEXT (fndecl)
3196 && TYPE_P (DECL_CONTEXT (fndecl))
3197 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3198 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3200 /* Mangle the name in a predictable way; we need to reference
3201 this from a java compiled object file. */
3202 tree oid, nid, alias;
3206 oid = DECL_ASSEMBLER_NAME (fndecl);
3207 oname = IDENTIFIER_POINTER (oid);
3208 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3209 nname = ACONCAT (("_ZGA", oname+2, NULL));
3210 nid = get_identifier (nname);
3212 alias = make_alias_for (fndecl, nid);
3213 TREE_PUBLIC (alias) = 1;
3214 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3216 assemble_alias (alias, oid);
3221 /* This routine is called at the end of compilation.
3222 Its job is to create all the code needed to initialize and
3223 destroy the global aggregates. We do the destruction
3224 first, since that way we only need to reverse the decls once. */
3227 cp_write_global_declarations (void)
3233 unsigned ssdf_count = 0;
3237 locus = input_location;
3240 /* Bad parse errors. Just forget about it. */
3241 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3245 c_common_write_pch ();
3247 /* FIXME - huh? was input_line -= 1;*/
3249 /* We now have to write out all the stuff we put off writing out.
3252 o Template specializations that we have not yet instantiated,
3253 but which are needed.
3254 o Initialization and destruction for non-local objects with
3255 static storage duration. (Local objects with static storage
3256 duration are initialized when their scope is first entered,
3257 and are cleaned up via atexit.)
3258 o Virtual function tables.
3260 All of these may cause others to be needed. For example,
3261 instantiating one function may cause another to be needed, and
3262 generating the initializer for an object may cause templates to be
3263 instantiated, etc., etc. */
3265 timevar_push (TV_VARCONST);
3267 emit_support_tinfos ();
3276 /* If there are templates that we've put off instantiating, do
3278 instantiate_pending_templates (retries);
3281 /* Write out virtual tables as required. Note that writing out
3282 the virtual table for a template class may cause the
3283 instantiation of members of that class. If we write out
3284 vtables then we remove the class from our list so we don't
3285 have to look at it again. */
3287 while (keyed_classes != NULL_TREE
3288 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3291 keyed_classes = TREE_CHAIN (keyed_classes);
3297 tree next = TREE_CHAIN (t);
3301 if (maybe_emit_vtables (TREE_VALUE (next)))
3304 TREE_CHAIN (t) = TREE_CHAIN (next);
3309 next = TREE_CHAIN (t);
3313 /* Write out needed type info variables. We have to be careful
3314 looping through unemitted decls, because emit_tinfo_decl may
3315 cause other variables to be needed. New elements will be
3316 appended, and we remove from the vector those that actually
3318 for (i = VEC_length (tree, unemitted_tinfo_decls);
3319 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3320 if (emit_tinfo_decl (t))
3323 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3326 /* The list of objects with static storage duration is built up
3327 in reverse order. We clear STATIC_AGGREGATES so that any new
3328 aggregates added during the initialization of these will be
3329 initialized in the correct order when we next come around the
3331 vars = prune_vars_needing_no_initialization (&static_aggregates);
3335 /* We need to start a new initialization function each time
3336 through the loop. That's because we need to know which
3337 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3338 isn't computed until a function is finished, and written
3339 out. That's a deficiency in the back end. When this is
3340 fixed, these initialization functions could all become
3341 inline, with resulting performance improvements. */
3344 /* Set the line and file, so that it is obviously not from
3346 input_location = locus;
3347 ssdf_body = start_static_storage_duration_function (ssdf_count);
3349 /* Make sure the back end knows about all the variables. */
3350 write_out_vars (vars);
3352 /* First generate code to do all the initializations. */
3354 do_static_initialization_or_destruction (vars, /*initp=*/true);
3356 /* Then, generate code to do all the destructions. Do these
3357 in reverse order so that the most recently constructed
3358 variable is the first destroyed. If we're using
3359 __cxa_atexit, then we don't need to do this; functions
3360 were registered at initialization time to destroy the
3362 if (!flag_use_cxa_atexit && vars)
3364 vars = nreverse (vars);
3365 do_static_initialization_or_destruction (vars, /*initp=*/false);
3370 /* Finish up the static storage duration function for this
3372 input_location = locus;
3373 finish_static_storage_duration_function (ssdf_body);
3375 /* All those initializations and finalizations might cause
3376 us to need more inline functions, more template
3377 instantiations, etc. */
3380 /* ??? was: locus.line++; */
3383 /* Go through the set of inline functions whose bodies have not
3384 been emitted yet. If out-of-line copies of these functions
3385 are required, emit them. */
3386 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3388 /* Does it need synthesizing? */
3389 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3390 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3392 /* Even though we're already at the top-level, we push
3393 there again. That way, when we pop back a few lines
3394 hence, all of our state is restored. Otherwise,
3395 finish_function doesn't clean things up, and we end
3396 up with CURRENT_FUNCTION_DECL set. */
3397 push_to_top_level ();
3398 /* The decl's location will mark where it was first
3399 needed. Save that so synthesize method can indicate
3400 where it was needed from, in case of error */
3401 input_location = DECL_SOURCE_LOCATION (decl);
3402 synthesize_method (decl);
3403 pop_from_top_level ();
3407 if (!DECL_SAVED_TREE (decl))
3410 /* We lie to the back end, pretending that some functions
3411 are not defined when they really are. This keeps these
3412 functions from being put out unnecessarily. But, we must
3413 stop lying when the functions are referenced, or if they
3414 are not comdat since they need to be put out now. If
3415 DECL_INTERFACE_KNOWN, then we have already set
3416 DECL_EXTERNAL appropriately, so there's no need to check
3417 again, and we do not want to clear DECL_EXTERNAL if a
3418 previous call to import_export_decl set it.
3420 This is done in a separate for cycle, because if some
3421 deferred function is contained in another deferred
3422 function later in deferred_fns varray,
3423 rest_of_compilation would skip this function and we
3424 really cannot expand the same function twice. */
3425 import_export_decl (decl);
3426 if (DECL_NOT_REALLY_EXTERN (decl)
3427 && DECL_INITIAL (decl)
3428 && decl_needed_p (decl))
3429 DECL_EXTERNAL (decl) = 0;
3431 /* If we're going to need to write this function out, and
3432 there's already a body for it, create RTL for it now.
3433 (There might be no body if this is a method we haven't
3434 gotten around to synthesizing yet.) */
3435 if (!DECL_EXTERNAL (decl)
3436 && decl_needed_p (decl)
3437 && !TREE_ASM_WRITTEN (decl)
3438 && !cgraph_node (decl)->local.finalized)
3440 /* We will output the function; no longer consider it in this
3442 DECL_DEFER_OUTPUT (decl) = 0;
3443 /* Generate RTL for this function now that we know we
3445 expand_or_defer_fn (decl);
3446 /* If we're compiling -fsyntax-only pretend that this
3447 function has been written out so that we don't try to
3449 if (flag_syntax_only)
3450 TREE_ASM_WRITTEN (decl) = 1;
3455 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3458 /* Static data members are just like namespace-scope globals. */
3459 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3461 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3462 /* Don't write it out if we haven't seen a definition. */
3463 || DECL_IN_AGGR_P (decl))
3465 import_export_decl (decl);
3466 /* If this static data member is needed, provide it to the
3468 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3469 DECL_EXTERNAL (decl) = 0;
3471 if (VEC_length (tree, pending_statics) != 0
3472 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3473 VEC_length (tree, pending_statics)))
3480 /* All used inline functions must have a definition at this point. */
3481 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3483 if (/* Check online inline functions that were actually used. */
3484 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3485 /* If the definition actually was available here, then the
3486 fact that the function was not defined merely represents
3487 that for some reason (use of a template repository,
3488 #pragma interface, etc.) we decided not to emit the
3490 && !DECL_INITIAL (decl)
3491 /* An explicit instantiation can be used to specify
3492 that the body is in another unit. It will have
3493 already verified there was a definition. */
3494 && !DECL_EXPLICIT_INSTANTIATION (decl))
3496 warning (0, "inline function %q+D used but never defined", decl);
3497 /* Avoid a duplicate warning from check_global_declaration_1. */
3498 TREE_NO_WARNING (decl) = 1;
3502 /* We give C linkage to static constructors and destructors. */
3503 push_lang_context (lang_name_c);
3505 /* Generate initialization and destruction functions for all
3506 priorities for which they are required. */
3507 if (priority_info_map)
3508 splay_tree_foreach (priority_info_map,
3509 generate_ctor_and_dtor_functions_for_priority,
3511 else if (c_dialect_objc () && objc_static_init_needed_p ())
3512 /* If this is obj-c++ and we need a static init, call
3513 generate_ctor_or_dtor_function. */
3514 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3515 DEFAULT_INIT_PRIORITY, &locus);
3517 /* We're done with the splay-tree now. */
3518 if (priority_info_map)
3519 splay_tree_delete (priority_info_map);
3521 /* Generate any missing aliases. */
3522 maybe_apply_pending_pragma_weaks ();
3524 /* We're done with static constructors, so we can go back to "C++"
3526 pop_lang_context ();
3528 cgraph_finalize_compilation_unit ();
3531 /* Now, issue warnings about static, but not defined, functions,
3532 etc., and emit debugging information. */
3533 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3534 if (VEC_length (tree, pending_statics) != 0)
3536 check_global_declarations (VEC_address (tree, pending_statics),
3537 VEC_length (tree, pending_statics));
3538 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3539 VEC_length (tree, pending_statics));
3542 /* Generate hidden aliases for Java. */
3543 build_java_method_aliases ();
3547 /* The entire file is now complete. If requested, dump everything
3551 FILE *stream = dump_begin (TDI_tu, &flags);
3555 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3556 dump_end (TDI_tu, stream);
3560 timevar_pop (TV_VARCONST);
3562 if (flag_detailed_statistics)
3564 dump_tree_statistics ();
3565 dump_time_statistics ();
3567 input_location = locus;
3569 #ifdef ENABLE_CHECKING
3570 validate_conversion_obstack ();
3571 #endif /* ENABLE_CHECKING */
3574 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3575 function to call in parse-tree form; it has not yet been
3576 semantically analyzed. ARGS are the arguments to the function.
3577 They have already been semantically analyzed. */
3580 build_offset_ref_call_from_tree (tree fn, tree args)
3589 object = TREE_OPERAND (fn, 0);
3591 if (processing_template_decl)
3593 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3594 || TREE_CODE (fn) == MEMBER_REF);
3595 if (type_dependent_expression_p (fn)
3596 || any_type_dependent_arguments_p (args))
3597 return build_nt_call_list (fn, args);
3599 /* Transform the arguments and add the implicit "this"
3600 parameter. That must be done before the FN is transformed
3601 because we depend on the form of FN. */
3602 args = build_non_dependent_args (args);
3603 object = build_non_dependent_expr (object);
3604 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3605 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3606 args = tree_cons (NULL_TREE, object, args);
3607 /* Now that the arguments are done, transform FN. */
3608 fn = build_non_dependent_expr (fn);
3611 /* A qualified name corresponding to a bound pointer-to-member is
3612 represented as an OFFSET_REF:
3614 struct B { void g(); };
3616 void B::g() { (this->*p)(); } */
3617 if (TREE_CODE (fn) == OFFSET_REF)
3619 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3620 tf_warning_or_error);
3621 fn = TREE_OPERAND (fn, 1);
3622 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3623 args = tree_cons (NULL_TREE, object_addr, args);
3626 expr = cp_build_function_call (fn, args, tf_warning_or_error);
3627 if (processing_template_decl && expr != error_mark_node)
3628 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3634 check_default_args (tree x)
3636 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3637 bool saw_def = false;
3638 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3639 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3641 if (TREE_PURPOSE (arg))
3645 error ("default argument missing for parameter %P of %q+#D", i, x);
3646 TREE_PURPOSE (arg) = error_mark_node;
3651 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3652 If DECL is a specialization or implicitly declared class member,
3653 generate the actual definition. */
3656 mark_used (tree decl)
3658 HOST_WIDE_INT saved_processing_template_decl = 0;
3660 /* If DECL is a BASELINK for a single function, then treat it just
3661 like the DECL for the function. Otherwise, if the BASELINK is
3662 for an overloaded function, we don't know which function was
3663 actually used until after overload resolution. */
3664 if (TREE_CODE (decl) == BASELINK)
3666 decl = BASELINK_FUNCTIONS (decl);
3667 if (really_overloaded_fn (decl))
3669 decl = OVL_CURRENT (decl);
3672 TREE_USED (decl) = 1;
3673 if (DECL_CLONED_FUNCTION_P (decl))
3674 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3675 /* If we don't need a value, then we don't need to synthesize DECL. */
3676 if (skip_evaluation)
3678 /* Normally, we can wait until instantiation-time to synthesize
3679 DECL. However, if DECL is a static data member initialized with
3680 a constant, we need the value right now because a reference to
3681 such a data member is not value-dependent. */
3682 if (TREE_CODE (decl) == VAR_DECL
3683 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3684 && DECL_CLASS_SCOPE_P (decl))
3686 /* Don't try to instantiate members of dependent types. We
3687 cannot just use dependent_type_p here because this function
3688 may be called from fold_non_dependent_expr, and then we may
3689 see dependent types, even though processing_template_decl
3691 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3692 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3694 /* Pretend that we are not in a template, even if we are, so
3695 that the static data member initializer will be processed. */
3696 saved_processing_template_decl = processing_template_decl;
3697 processing_template_decl = 0;
3700 if (processing_template_decl)
3703 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3704 && !TREE_ASM_WRITTEN (decl))
3705 /* Remember it, so we can check it was defined. */
3707 if (DECL_DEFERRED_FN (decl))
3710 /* Remember the current location for a function we will end up
3711 synthesizing. Then we can inform the user where it was
3712 required in the case of error. */
3713 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3714 && !DECL_THUNK_P (decl))
3715 DECL_SOURCE_LOCATION (decl) = input_location;
3717 note_vague_linkage_fn (decl);
3720 assemble_external (decl);
3722 /* Is it a synthesized method that needs to be synthesized? */
3723 if (TREE_CODE (decl) == FUNCTION_DECL
3724 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3725 && DECL_ARTIFICIAL (decl)
3726 && !DECL_THUNK_P (decl)
3727 && ! DECL_INITIAL (decl)
3728 /* Kludge: don't synthesize for default args. Unfortunately this
3729 rules out initializers of namespace-scoped objects too, but
3730 it's sort-of ok if the implicit ctor or dtor decl keeps
3731 pointing to the class location. */
3732 && current_function_decl)
3734 synthesize_method (decl);
3735 /* If we've already synthesized the method we don't need to
3736 do the instantiation test below. */
3738 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3739 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3740 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3741 || (TREE_CODE (decl) == FUNCTION_DECL
3742 && DECL_INLINE (DECL_TEMPLATE_RESULT
3743 (template_for_substitution (decl))))
3744 /* We need to instantiate static data members so that there
3745 initializers are available in integral constant
3747 || (TREE_CODE (decl) == VAR_DECL
3748 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3749 /* If this is a function or variable that is an instance of some
3750 template, we now know that we will need to actually do the
3751 instantiation. We check that DECL is not an explicit
3752 instantiation because that is not checked in instantiate_decl.
3754 We put off instantiating functions in order to improve compile
3755 times. Maintaining a stack of active functions is expensive,
3756 and the inliner knows to instantiate any functions it might
3757 need. Therefore, we always try to defer instantiation. */
3758 instantiate_decl (decl, /*defer_ok=*/true,
3759 /*expl_inst_class_mem_p=*/false);
3761 processing_template_decl = saved_processing_template_decl;
3764 #include "gt-cp-decl2.h"