1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* Process declarations and symbol lookup for C++ front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
32 #include "coretypes.h"
47 #include "tree-mudflap.h"
49 #include "tree-inline.h"
51 #include "tree-dump.h"
54 extern cpp_reader *parse_in;
56 /* This structure contains information about the initializations
57 and/or destructions required for a particular priority level. */
58 typedef struct priority_info_s {
59 /* Nonzero if there have been any initializations at this priority
60 throughout the translation unit. */
61 int initializations_p;
62 /* Nonzero if there have been any destructions at this priority
63 throughout the translation unit. */
67 static void mark_vtable_entries (tree);
68 static bool maybe_emit_vtables (tree);
69 static bool acceptable_java_type (tree);
70 static tree start_objects (int, int);
71 static void finish_objects (int, int, tree);
72 static tree start_static_storage_duration_function (unsigned);
73 static void finish_static_storage_duration_function (tree);
74 static priority_info get_priority_info (int);
75 static void do_static_initialization_or_destruction (tree, bool);
76 static void one_static_initialization_or_destruction (tree, tree, bool);
77 static void generate_ctor_or_dtor_function (bool, int, location_t *);
78 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
80 static tree prune_vars_needing_no_initialization (tree *);
81 static void write_out_vars (tree);
82 static void import_export_class (tree);
83 static tree get_guard_bits (tree);
84 static void determine_visibility_from_class (tree, tree);
86 /* A list of static class variables. This is needed, because a
87 static class variable can be declared inside the class without
88 an initializer, and then initialized, statically, outside the class. */
89 static GTY(()) VEC(tree,gc) *pending_statics;
91 /* A list of functions which were declared inline, but which we
92 may need to emit outline anyway. */
93 static GTY(()) VEC(tree,gc) *deferred_fns;
95 /* Nonzero if we're done parsing and into end-of-file activities. */
101 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
102 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
103 that apply to the function). */
106 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
111 if (fntype == error_mark_node || ctype == error_mark_node)
112 return error_mark_node;
114 type_quals = quals & ~TYPE_QUAL_RESTRICT;
115 ctype = cp_build_qualified_type (ctype, type_quals);
116 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
117 (TREE_CODE (fntype) == METHOD_TYPE
118 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
119 : TYPE_ARG_TYPES (fntype)));
120 raises = TYPE_RAISES_EXCEPTIONS (fntype);
122 fntype = build_exception_variant (fntype, raises);
127 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
131 cp_build_parm_decl (tree name, tree type)
133 tree parm = build_decl (PARM_DECL, name, type);
134 /* DECL_ARG_TYPE is only used by the back end and the back end never
136 if (!processing_template_decl)
137 DECL_ARG_TYPE (parm) = type_passed_as (type);
139 /* If the type is a pack expansion, then we have a function
141 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
142 FUNCTION_PARAMETER_PACK_P (parm) = 1;
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name, tree type)
153 tree parm = cp_build_parm_decl (name, type);
154 DECL_ARTIFICIAL (parm) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn)
177 tree basetype, arg_types, parms, parm, fntype;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
194 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
195 basetype = TREE_TYPE (TREE_VALUE (arg_types));
196 arg_types = TREE_CHAIN (arg_types);
198 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm) = parms;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
213 DECL_HAS_VTT_PARM_P (fn) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
218 TREE_CHAIN (parm) = parms;
220 arg_types = hash_tree_chain (integer_type_node, arg_types);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
225 /* And rebuild the function type. */
226 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
229 fntype = build_exception_variant (fntype,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
231 TREE_TYPE (fn) = fntype;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype, tree function, enum overload_flags flags)
260 tree fn_name = DECL_NAME (function);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function, lang_cplusplus);
266 if (fn_name == NULL_TREE)
268 error ("name missing for member function");
269 fn_name = get_identifier ("<anonymous>");
270 DECL_NAME (function) = fn_name;
273 DECL_CONTEXT (function) = ctype;
275 if (flags == DTOR_FLAG)
276 DECL_DESTRUCTOR_P (function) = 1;
278 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
279 maybe_retrofit_in_chrg (function);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr, tree index_exp)
290 tree orig_array_expr = array_expr;
291 tree orig_index_exp = index_exp;
293 if (error_operand_p (array_expr) || error_operand_p (index_exp))
294 return error_mark_node;
296 if (processing_template_decl)
298 if (type_dependent_expression_p (array_expr)
299 || type_dependent_expression_p (index_exp))
300 return build_min_nt (ARRAY_REF, array_expr, index_exp,
301 NULL_TREE, NULL_TREE);
302 array_expr = build_non_dependent_expr (array_expr);
303 index_exp = build_non_dependent_expr (index_exp);
306 type = TREE_TYPE (array_expr);
308 type = non_reference (type);
310 /* If they have an `operator[]', use that. */
311 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type) == ARRAY_TYPE)
326 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
328 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
331 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
333 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
335 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
338 if ((p1 && i2) && (i1 && p2))
339 error ("ambiguous conversion for array subscript");
342 array_expr = p1, index_exp = i2;
344 array_expr = p2, index_exp = i1;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type, TREE_TYPE (index_exp));
349 return error_mark_node;
352 if (array_expr == error_mark_node || index_exp == error_mark_node)
353 error ("ambiguous conversion for array subscript");
355 expr = build_array_ref (array_expr, index_exp);
357 if (processing_template_decl && expr != error_mark_node)
358 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
359 NULL_TREE, NULL_TREE);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
375 if (exp == error_mark_node)
378 if (processing_template_decl)
380 t = build_min (DELETE_EXPR, void_type_node, exp, size);
381 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
382 DELETE_EXPR_USE_VEC (t) = doing_vec;
383 TREE_SIDE_EFFECTS (t) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
390 warning (0, "deleting array %q#D", exp);
392 t = build_expr_type_conversion (WANT_POINTER, exp, true);
394 if (t == NULL_TREE || t == error_mark_node)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node;
401 type = TREE_TYPE (t);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
416 warning (0, "deleting %qT is undefined", type);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t))
422 return build1 (NOP_EXPR, void_type_node, t);
425 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
426 sfk_deleting_destructor,
429 return build_delete (type, t, sfk_deleting_destructor,
430 LOOKUP_NORMAL, use_global_delete);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl)
441 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
442 decl = DECL_TEMPLATE_RESULT (tmpl);
444 if (TREE_CODE (decl) == FUNCTION_DECL
445 || (TREE_CODE (decl) == TYPE_DECL
446 && IS_AGGR_TYPE (TREE_TYPE (decl))))
448 /* The parser rejects template declarations in local classes. */
449 gcc_assert (!current_function_decl);
450 /* The parser rejects any use of virtual in a function template. */
451 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
452 && DECL_VIRTUAL_P (decl)));
454 /* The debug-information generating code doesn't know what to do
455 with member templates. */
456 DECL_IGNORED_P (tmpl) = 1;
459 error ("template declaration of %q#D", decl);
462 /* Return true iff TYPE is a valid Java parameter or return type. */
465 acceptable_java_type (tree type)
467 if (type == error_mark_node)
470 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
472 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
474 type = TREE_TYPE (type);
475 if (TREE_CODE (type) == RECORD_TYPE)
478 if (! TYPE_FOR_JAVA (type))
480 if (! CLASSTYPE_TEMPLATE_INFO (type))
482 args = CLASSTYPE_TI_ARGS (type);
483 i = TREE_VEC_LENGTH (args);
486 type = TREE_VEC_ELT (args, i);
487 if (TREE_CODE (type) == POINTER_TYPE)
488 type = TREE_TYPE (type);
489 if (! TYPE_FOR_JAVA (type))
498 /* For a METHOD in a Java class CTYPE, return true if
499 the parameter and return types are valid Java types.
500 Otherwise, print appropriate error messages, and return false. */
503 check_java_method (tree method)
506 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
507 tree ret_type = TREE_TYPE (TREE_TYPE (method));
509 if (!acceptable_java_type (ret_type))
511 error ("Java method %qD has non-Java return type %qT",
516 arg_types = TREE_CHAIN (arg_types);
517 if (DECL_HAS_IN_CHARGE_PARM_P (method))
518 arg_types = TREE_CHAIN (arg_types);
519 if (DECL_HAS_VTT_PARM_P (method))
520 arg_types = TREE_CHAIN (arg_types);
522 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
524 tree type = TREE_VALUE (arg_types);
525 if (!acceptable_java_type (type))
527 if (type != error_mark_node)
528 error ("Java method %qD has non-Java parameter type %qT",
536 /* Sanity check: report error if this function FUNCTION is not
537 really a member of the class (CTYPE) it is supposed to belong to.
538 TEMPLATE_PARMS is used to specify the template parameters of a member
539 template passed as FUNCTION_DECL. If the member template is passed as a
540 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
541 from the declaration. If the function is not a function template, it
543 It returns the original declaration for the function, NULL_TREE if
544 no declaration was found, error_mark_node if an error was emitted. */
547 check_classfn (tree ctype, tree function, tree template_parms)
553 if (DECL_USE_TEMPLATE (function)
554 && !(TREE_CODE (function) == TEMPLATE_DECL
555 && DECL_TEMPLATE_SPECIALIZATION (function))
556 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
557 /* Since this is a specialization of a member template,
558 we're not going to find the declaration in the class.
561 struct S { template <typename T> void f(T); };
562 template <> void S::f(int);
564 we're not going to find `S::f(int)', but there's no
565 reason we should, either. We let our callers know we didn't
566 find the method, but we don't complain. */
569 /* Basic sanity check: for a template function, the template parameters
570 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
571 if (TREE_CODE (function) == TEMPLATE_DECL)
573 gcc_assert (!template_parms
574 || comp_template_parms (template_parms,
575 DECL_TEMPLATE_PARMS (function)));
576 template_parms = DECL_TEMPLATE_PARMS (function);
579 /* OK, is this a definition of a member template? */
580 is_template = (template_parms != NULL_TREE);
582 /* We must enter the scope here, because conversion operators are
583 named by target type, and type equivalence relies on typenames
584 resolving within the scope of CTYPE. */
585 pushed_scope = push_scope (ctype);
586 ix = class_method_index_for_fn (complete_type (ctype), function);
589 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
590 tree fndecls, fndecl = 0;
592 const char *format = NULL;
594 for (fndecls = VEC_index (tree, methods, ix);
595 fndecls; fndecls = OVL_NEXT (fndecls))
599 fndecl = OVL_CURRENT (fndecls);
600 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
601 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
603 /* We cannot simply call decls_match because this doesn't
604 work for static member functions that are pretending to
605 be methods, and because the name may have been changed by
608 /* Get rid of the this parameter on functions that become
610 if (DECL_STATIC_FUNCTION_P (fndecl)
611 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
612 p1 = TREE_CHAIN (p1);
614 /* A member template definition only matches a member template
616 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
619 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
620 TREE_TYPE (TREE_TYPE (fndecl)))
621 && compparms (p1, p2)
623 || comp_template_parms (template_parms,
624 DECL_TEMPLATE_PARMS (fndecl)))
625 && (DECL_TEMPLATE_SPECIALIZATION (function)
626 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
627 && (!DECL_TEMPLATE_SPECIALIZATION (function)
628 || (DECL_TI_TEMPLATE (function)
629 == DECL_TI_TEMPLATE (fndecl))))
635 pop_scope (pushed_scope);
636 return OVL_CURRENT (fndecls);
639 error ("prototype for %q#D does not match any in class %qT",
641 is_conv_op = DECL_CONV_FN_P (fndecl);
644 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
645 fndecls = VEC_index (tree, methods, ix);
648 fndecl = OVL_CURRENT (fndecls);
649 fndecls = OVL_NEXT (fndecls);
651 if (!fndecls && is_conv_op)
653 if (VEC_length (tree, methods) > (size_t) ++ix)
655 fndecls = VEC_index (tree, methods, ix);
656 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
668 format = N_("candidates are: %+#D");
670 format = N_("candidate is: %+#D");
671 error (format, fndecl);
674 else if (!COMPLETE_TYPE_P (ctype))
675 cxx_incomplete_type_error (function, ctype);
677 error ("no %q#D member function declared in class %qT",
681 pop_scope (pushed_scope);
682 return error_mark_node;
685 /* DECL is a function with vague linkage. Remember it so that at the
686 end of the translation unit we can decide whether or not to emit
690 note_vague_linkage_fn (tree decl)
692 if (!DECL_DEFERRED_FN (decl))
694 DECL_DEFERRED_FN (decl) = 1;
695 DECL_DEFER_OUTPUT (decl) = 1;
696 VEC_safe_push (tree, gc, deferred_fns, decl);
700 /* We have just processed the DECL, which is a static data member.
701 The other parameters are as for cp_finish_decl. */
704 finish_static_data_member_decl (tree decl,
705 tree init, bool init_const_expr_p,
709 DECL_CONTEXT (decl) = current_class_type;
711 /* We cannot call pushdecl here, because that would fill in the
712 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
713 the right thing, namely, to put this decl out straight away. */
715 if (! processing_template_decl)
716 VEC_safe_push (tree, gc, pending_statics, decl);
718 if (LOCAL_CLASS_P (current_class_type))
719 pedwarn ("local class %q#T shall not have static data member %q#D",
720 current_class_type, decl);
722 /* Static consts need not be initialized in the class definition. */
723 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
725 static int explained = 0;
727 error ("initializer invalid for static member with constructor");
730 error ("(an out of class initialization is required)");
735 /* Force the compiler to know when an uninitialized static const
736 member is being used. */
737 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
738 TREE_USED (decl) = 1;
739 DECL_INITIAL (decl) = init;
740 DECL_IN_AGGR_P (decl) = 1;
742 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
745 /* DECLARATOR and DECLSPECS correspond to a class member. The other
746 parameters are as for cp_finish_decl. Return the DECL for the
747 class member declared. */
750 grokfield (const cp_declarator *declarator,
751 cp_decl_specifier_seq *declspecs,
752 tree init, bool init_const_expr_p,
757 const char *asmspec = 0;
758 int flags = LOOKUP_ONLYCONVERTING;
761 && TREE_CODE (init) == TREE_LIST
762 && TREE_VALUE (init) == error_mark_node
763 && TREE_CHAIN (init) == NULL_TREE)
766 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
767 if (! value || error_operand_p (value))
768 /* friend or constructor went bad. */
769 return error_mark_node;
771 if (TREE_CODE (value) == TYPE_DECL && init)
773 error ("typedef %qD is initialized (use __typeof__ instead)", value);
777 /* Pass friendly classes back. */
778 if (value == void_type_node)
781 /* Pass friend decls back. */
782 if ((TREE_CODE (value) == FUNCTION_DECL
783 || TREE_CODE (value) == TEMPLATE_DECL)
784 && DECL_CONTEXT (value) != current_class_type)
787 if (DECL_NAME (value) != NULL_TREE
788 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
789 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
790 error ("member %qD conflicts with virtual function table field name",
793 /* Stash away type declarations. */
794 if (TREE_CODE (value) == TYPE_DECL)
796 DECL_NONLOCAL (value) = 1;
797 DECL_CONTEXT (value) = current_class_type;
799 if (processing_template_decl)
800 value = push_template_decl (value);
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)
919 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
921 if (value == error_mark_node)
922 return NULL_TREE; /* friends went bad. */
924 /* Pass friendly classes back. */
925 if (TREE_CODE (value) == VOID_TYPE)
926 return void_type_node;
928 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
929 && (POINTER_TYPE_P (value)
930 || !dependent_type_p (TREE_TYPE (value))))
932 error ("bit-field %qD with non-integral type", value);
933 return error_mark_node;
936 if (TREE_CODE (value) == TYPE_DECL)
938 error ("cannot declare %qD to be a bit-field type", value);
942 /* Usually, finish_struct_1 catches bitfields with invalid types.
943 But, in the case of bitfields with function type, we confuse
944 ourselves into thinking they are member functions, so we must
946 if (TREE_CODE (value) == FUNCTION_DECL)
948 error ("cannot declare bit-field %qD with function type",
953 if (DECL_IN_AGGR_P (value))
955 error ("%qD is already defined in the class %qT", value,
956 DECL_CONTEXT (value));
957 return void_type_node;
960 if (TREE_STATIC (value))
962 error ("static member %qD cannot be a bit-field", value);
965 finish_decl (value, NULL_TREE, NULL_TREE);
967 if (width != error_mark_node)
969 constant_expression_warning (width);
970 DECL_INITIAL (value) = width;
971 SET_DECL_C_BIT_FIELD (value);
974 DECL_IN_AGGR_P (value) = 1;
979 /* Returns true iff ATTR is an attribute which needs to be applied at
980 instantiation time rather than template definition time. */
983 is_late_template_attribute (tree attr, tree decl)
985 tree name = TREE_PURPOSE (attr);
986 tree args = TREE_VALUE (attr);
987 const struct attribute_spec *spec = lookup_attribute_spec (name);
990 /* Unknown attribute. */
993 if (is_attribute_p ("aligned", name)
995 && value_dependent_expression_p (TREE_VALUE (args)))
996 /* Can't apply this until we know the desired alignment. */
998 else if (TREE_CODE (decl) == TYPE_DECL || spec->type_required)
1000 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1002 /* We can't apply any attributes to a completely unknown type until
1003 instantiation time. */
1004 enum tree_code code = TREE_CODE (type);
1005 if (code == TEMPLATE_TYPE_PARM
1006 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1007 || code == TYPENAME_TYPE)
1016 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1017 applied at instantiation time and return them. If IS_DEPENDENT is true,
1018 the declaration itself is dependent, so all attributes should be applied
1019 at instantiation time. */
1022 splice_template_attributes (tree *attr_p, tree decl)
1025 tree late_attrs = NULL_TREE;
1026 tree *q = &late_attrs;
1033 if (is_late_template_attribute (*p, decl))
1035 ATTR_IS_DEPENDENT (*p) = 1;
1037 *p = TREE_CHAIN (*p);
1038 q = &TREE_CHAIN (*q);
1042 p = &TREE_CHAIN (*p);
1048 /* Remove any late attributes from the list in ATTR_P and attach them to
1052 save_template_attributes (tree *attr_p, tree *decl_p)
1054 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1060 /* Give this type a name so we know to look it up again at instantiation
1062 if (TREE_CODE (*decl_p) == TYPE_DECL
1063 && DECL_ORIGINAL_TYPE (*decl_p) == NULL_TREE)
1065 tree oldt = TREE_TYPE (*decl_p);
1066 tree newt = build_variant_type_copy (oldt);
1067 DECL_ORIGINAL_TYPE (*decl_p) = oldt;
1068 TREE_TYPE (*decl_p) = newt;
1069 TYPE_NAME (newt) = *decl_p;
1070 TREE_USED (newt) = TREE_USED (*decl_p);
1073 if (DECL_P (*decl_p))
1074 q = &DECL_ATTRIBUTES (*decl_p);
1076 q = &TYPE_ATTRIBUTES (*decl_p);
1079 q = &TREE_CHAIN (tree_last (*q));
1083 /* Like decl_attributes, but handle C++ complexity. */
1086 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1088 if (*decl == NULL_TREE || *decl == void_type_node
1089 || *decl == error_mark_node
1090 || attributes == NULL_TREE)
1093 if (processing_template_decl)
1095 save_template_attributes (&attributes, decl);
1096 if (attributes == NULL_TREE)
1100 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1101 decl = &DECL_TEMPLATE_RESULT (*decl);
1103 decl_attributes (decl, attributes, flags);
1105 if (TREE_CODE (*decl) == TYPE_DECL)
1106 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1109 /* Walks through the namespace- or function-scope anonymous union
1110 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1111 Returns one of the fields for use in the mangled name. */
1114 build_anon_union_vars (tree type, tree object)
1116 tree main_decl = NULL_TREE;
1119 /* Rather than write the code to handle the non-union case,
1120 just give an error. */
1121 if (TREE_CODE (type) != UNION_TYPE)
1122 error ("anonymous struct not inside named type");
1124 for (field = TYPE_FIELDS (type);
1126 field = TREE_CHAIN (field))
1131 if (DECL_ARTIFICIAL (field))
1133 if (TREE_CODE (field) != FIELD_DECL)
1135 pedwarn ("%q+#D invalid; an anonymous union can only "
1136 "have non-static data members", field);
1140 if (TREE_PRIVATE (field))
1141 pedwarn ("private member %q+#D in anonymous union", field);
1142 else if (TREE_PROTECTED (field))
1143 pedwarn ("protected member %q+#D in anonymous union", field);
1145 if (processing_template_decl)
1146 ref = build_min_nt (COMPONENT_REF, object,
1147 DECL_NAME (field), NULL_TREE);
1149 ref = build_class_member_access_expr (object, field, NULL_TREE,
1152 if (DECL_NAME (field))
1156 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1157 DECL_ANON_UNION_VAR_P (decl) = 1;
1159 base = get_base_address (object);
1160 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1161 TREE_STATIC (decl) = TREE_STATIC (base);
1162 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1164 SET_DECL_VALUE_EXPR (decl, ref);
1165 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1167 decl = pushdecl (decl);
1169 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1170 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1174 if (main_decl == NULL_TREE)
1181 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1182 anonymous union, then all members must be laid out together. PUBLIC_P
1183 is nonzero if this union is not declared static. */
1186 finish_anon_union (tree anon_union_decl)
1192 if (anon_union_decl == error_mark_node)
1195 type = TREE_TYPE (anon_union_decl);
1196 public_p = TREE_PUBLIC (anon_union_decl);
1198 /* The VAR_DECL's context is the same as the TYPE's context. */
1199 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1201 if (TYPE_FIELDS (type) == NULL_TREE)
1206 error ("namespace-scope anonymous aggregates must be static");
1210 main_decl = build_anon_union_vars (type, anon_union_decl);
1211 if (main_decl == error_mark_node)
1213 if (main_decl == NULL_TREE)
1215 warning (0, "anonymous union with no members");
1219 if (!processing_template_decl)
1221 /* Use main_decl to set the mangled name. */
1222 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1223 mangle_decl (anon_union_decl);
1224 DECL_NAME (anon_union_decl) = NULL_TREE;
1227 pushdecl (anon_union_decl);
1228 if (building_stmt_tree ()
1229 && at_function_scope_p ())
1230 add_decl_expr (anon_union_decl);
1231 else if (!processing_template_decl)
1232 rest_of_decl_compilation (anon_union_decl,
1233 toplevel_bindings_p (), at_eof);
1236 /* Auxiliary functions to make type signatures for
1237 `operator new' and `operator delete' correspond to
1238 what compiler will be expecting. */
1241 coerce_new_type (tree type)
1244 tree args = TYPE_ARG_TYPES (type);
1246 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1248 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1251 error ("%<operator new%> must return type %qT", ptr_type_node);
1254 if (args && args != void_list_node)
1256 if (TREE_PURPOSE (args))
1258 /* [basic.stc.dynamic.allocation]
1260 The first parameter shall not have an associated default
1262 error ("the first parameter of %<operator new%> cannot "
1263 "have a default argument");
1264 /* Throw away the default argument. */
1265 TREE_PURPOSE (args) = NULL_TREE;
1268 if (!same_type_p (TREE_VALUE (args), size_type_node))
1271 args = TREE_CHAIN (args);
1278 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1279 "as first parameter", size_type_node);
1284 args = tree_cons (NULL_TREE, size_type_node, args);
1287 type = build_exception_variant
1288 (build_function_type (ptr_type_node, args),
1289 TYPE_RAISES_EXCEPTIONS (type));
1297 coerce_delete_type (tree type)
1300 tree args = TYPE_ARG_TYPES (type);
1302 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1304 if (!same_type_p (TREE_TYPE (type), void_type_node))
1307 error ("%<operator delete%> must return type %qT", void_type_node);
1310 if (!args || args == void_list_node
1311 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1314 if (args && args != void_list_node)
1315 args = TREE_CHAIN (args);
1316 error ("%<operator delete%> takes type %qT as first parameter",
1322 args = tree_cons (NULL_TREE, ptr_type_node, args);
1325 type = build_exception_variant
1326 (build_function_type (void_type_node, args),
1327 TYPE_RAISES_EXCEPTIONS (type));
1335 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1336 and mark them as needed. */
1339 mark_vtable_entries (tree decl)
1342 unsigned HOST_WIDE_INT idx;
1344 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1349 STRIP_NOPS (fnaddr);
1351 if (TREE_CODE (fnaddr) != ADDR_EXPR
1352 && TREE_CODE (fnaddr) != FDESC_EXPR)
1353 /* This entry is an offset: a virtual base class offset, a
1354 virtual call offset, an RTTI offset, etc. */
1357 fn = TREE_OPERAND (fnaddr, 0);
1358 TREE_ADDRESSABLE (fn) = 1;
1359 /* When we don't have vcall offsets, we output thunks whenever
1360 we output the vtables that contain them. With vcall offsets,
1361 we know all the thunks we'll need when we emit a virtual
1362 function, so we emit the thunks there instead. */
1363 if (DECL_THUNK_P (fn))
1364 use_thunk (fn, /*emit_p=*/0);
1369 /* Set DECL up to have the closest approximation of "initialized common"
1370 linkage available. */
1373 comdat_linkage (tree decl)
1376 make_decl_one_only (decl);
1377 else if (TREE_CODE (decl) == FUNCTION_DECL
1378 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1379 /* We can just emit function and compiler-generated variables
1380 statically; having multiple copies is (for the most part) only
1383 There are two correctness issues, however: the address of a
1384 template instantiation with external linkage should be the
1385 same, independent of what translation unit asks for the
1386 address, and this will not hold when we emit multiple copies of
1387 the function. However, there's little else we can do.
1389 Also, by default, the typeinfo implementation assumes that
1390 there will be only one copy of the string used as the name for
1391 each type. Therefore, if weak symbols are unavailable, the
1392 run-time library should perform a more conservative check; it
1393 should perform a string comparison, rather than an address
1395 TREE_PUBLIC (decl) = 0;
1398 /* Static data member template instantiations, however, cannot
1399 have multiple copies. */
1400 if (DECL_INITIAL (decl) == 0
1401 || DECL_INITIAL (decl) == error_mark_node)
1402 DECL_COMMON (decl) = 1;
1403 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1405 DECL_COMMON (decl) = 1;
1406 DECL_INITIAL (decl) = error_mark_node;
1408 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1410 /* We can't do anything useful; leave vars for explicit
1412 DECL_EXTERNAL (decl) = 1;
1413 DECL_NOT_REALLY_EXTERN (decl) = 0;
1417 if (DECL_LANG_SPECIFIC (decl))
1418 DECL_COMDAT (decl) = 1;
1421 /* For win32 we also want to put explicit instantiations in
1422 linkonce sections, so that they will be merged with implicit
1423 instantiations; otherwise we get duplicate symbol errors.
1424 For Darwin we do not want explicit instantiations to be
1428 maybe_make_one_only (tree decl)
1430 /* We used to say that this was not necessary on targets that support weak
1431 symbols, because the implicit instantiations will defer to the explicit
1432 one. However, that's not actually the case in SVR4; a strong definition
1433 after a weak one is an error. Also, not making explicit
1434 instantiations one_only means that we can end up with two copies of
1435 some template instantiations. */
1439 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1440 we can get away with not emitting them if they aren't used. We need
1441 to for variables so that cp_finish_decl will update their linkage,
1442 because their DECL_INITIAL may not have been set properly yet. */
1444 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1445 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1446 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1448 make_decl_one_only (decl);
1450 if (TREE_CODE (decl) == VAR_DECL)
1452 DECL_COMDAT (decl) = 1;
1453 /* Mark it needed so we don't forget to emit it. */
1454 mark_decl_referenced (decl);
1459 /* Determine whether or not we want to specifically import or export CTYPE,
1460 using various heuristics. */
1463 import_export_class (tree ctype)
1465 /* -1 for imported, 1 for exported. */
1466 int import_export = 0;
1468 /* It only makes sense to call this function at EOF. The reason is
1469 that this function looks at whether or not the first non-inline
1470 non-abstract virtual member function has been defined in this
1471 translation unit. But, we can't possibly know that until we've
1472 seen the entire translation unit. */
1473 gcc_assert (at_eof);
1475 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1478 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1479 we will have CLASSTYPE_INTERFACE_ONLY set but not
1480 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1481 heuristic because someone will supply a #pragma implementation
1482 elsewhere, and deducing it here would produce a conflict. */
1483 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1486 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1488 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1490 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1491 && !flag_implicit_templates)
1492 /* For a template class, without -fimplicit-templates, check the
1493 repository. If the virtual table is assigned to this
1494 translation unit, then export the class; otherwise, import
1496 import_export = repo_export_class_p (ctype) ? 1 : -1;
1497 else if (TYPE_POLYMORPHIC_P (ctype))
1499 /* The ABI specifies that the virtual table and associated
1500 information are emitted with the key method, if any. */
1501 tree method = CLASSTYPE_KEY_METHOD (ctype);
1502 /* If weak symbol support is not available, then we must be
1503 careful not to emit the vtable when the key function is
1504 inline. An inline function can be defined in multiple
1505 translation units. If we were to emit the vtable in each
1506 translation unit containing a definition, we would get
1507 multiple definition errors at link-time. */
1508 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1509 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1512 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1513 a definition anywhere else. */
1514 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1517 /* Allow back ends the chance to overrule the decision. */
1518 if (targetm.cxx.import_export_class)
1519 import_export = targetm.cxx.import_export_class (ctype, import_export);
1523 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1524 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1528 /* Return true if VAR has already been provided to the back end; in that
1529 case VAR should not be modified further by the front end. */
1531 var_finalized_p (tree var)
1533 return varpool_node (var)->finalized;
1536 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1537 must be emitted in this translation unit. Mark it as such. */
1540 mark_needed (tree decl)
1542 /* It's possible that we no longer need to set
1543 TREE_SYMBOL_REFERENCED here directly, but doing so is
1545 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1546 mark_decl_referenced (decl);
1549 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1550 returns true if a definition of this entity should be provided in
1551 this object file. Callers use this function to determine whether
1552 or not to let the back end know that a definition of DECL is
1553 available in this translation unit. */
1556 decl_needed_p (tree decl)
1558 gcc_assert (TREE_CODE (decl) == VAR_DECL
1559 || TREE_CODE (decl) == FUNCTION_DECL);
1560 /* This function should only be called at the end of the translation
1561 unit. We cannot be sure of whether or not something will be
1562 COMDAT until that point. */
1563 gcc_assert (at_eof);
1565 /* All entities with external linkage that are not COMDAT should be
1566 emitted; they may be referred to from other object files. */
1567 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1569 /* If this entity was used, let the back end see it; it will decide
1570 whether or not to emit it into the object file. */
1571 if (TREE_USED (decl)
1572 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1573 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1575 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1576 reference to DECL might cause it to be emitted later. */
1580 /* If necessary, write out the vtables for the dynamic class CTYPE.
1581 Returns true if any vtables were emitted. */
1584 maybe_emit_vtables (tree ctype)
1590 /* If the vtables for this class have already been emitted there is
1591 nothing more to do. */
1592 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1593 if (var_finalized_p (primary_vtbl))
1595 /* Ignore dummy vtables made by get_vtable_decl. */
1596 if (TREE_TYPE (primary_vtbl) == void_type_node)
1599 /* On some targets, we cannot determine the key method until the end
1600 of the translation unit -- which is when this function is
1602 if (!targetm.cxx.key_method_may_be_inline ())
1603 determine_key_method (ctype);
1605 /* See if any of the vtables are needed. */
1606 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1608 import_export_decl (vtbl);
1609 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1614 /* If the references to this class' vtables are optimized away,
1615 still emit the appropriate debugging information. See
1617 if (DECL_COMDAT (primary_vtbl)
1618 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1619 note_debug_info_needed (ctype);
1623 /* The ABI requires that we emit all of the vtables if we emit any
1625 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1627 /* Mark entities references from the virtual table as used. */
1628 mark_vtable_entries (vtbl);
1630 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1632 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1634 /* It had better be all done at compile-time. */
1639 DECL_EXTERNAL (vtbl) = 0;
1640 rest_of_decl_compilation (vtbl, 1, 1);
1642 /* Because we're only doing syntax-checking, we'll never end up
1643 actually marking the variable as written. */
1644 if (flag_syntax_only)
1645 TREE_ASM_WRITTEN (vtbl) = 1;
1648 /* Since we're writing out the vtable here, also write the debug
1650 note_debug_info_needed (ctype);
1655 /* A special return value from type_visibility meaning internal
1658 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1660 /* walk_tree helper function for type_visibility. */
1663 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1665 int *vis_p = (int *)data;
1670 else if (CLASS_TYPE_P (*tp))
1672 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1674 *vis_p = VISIBILITY_ANON;
1677 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1678 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1683 /* Returns the visibility of TYPE, which is the minimum visibility of its
1687 type_visibility (tree type)
1689 int vis = VISIBILITY_DEFAULT;
1690 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1694 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1695 specified (or if VISIBILITY is static). */
1698 constrain_visibility (tree decl, int visibility)
1700 if (visibility == VISIBILITY_ANON)
1702 /* extern "C" declarations aren't affected by the anonymous
1704 if (!DECL_EXTERN_C_P (decl))
1706 TREE_PUBLIC (decl) = 0;
1707 DECL_INTERFACE_KNOWN (decl) = 1;
1708 if (DECL_LANG_SPECIFIC (decl))
1709 DECL_NOT_REALLY_EXTERN (decl) = 1;
1712 else if (visibility > DECL_VISIBILITY (decl)
1713 && !DECL_VISIBILITY_SPECIFIED (decl))
1715 DECL_VISIBILITY (decl) = visibility;
1721 /* Constrain the visibility of DECL based on the visibility of its template
1725 constrain_visibility_for_template (tree decl, tree targs)
1727 /* If this is a template instantiation, check the innermost
1728 template args for visibility constraints. The outer template
1729 args are covered by the class check. */
1730 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1732 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1736 tree arg = TREE_VEC_ELT (args, i-1);
1738 vis = type_visibility (arg);
1739 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1742 if (TREE_CODE (arg) == ADDR_EXPR)
1743 arg = TREE_OPERAND (arg, 0);
1744 if (TREE_CODE (arg) == VAR_DECL
1745 || TREE_CODE (arg) == FUNCTION_DECL)
1747 if (! TREE_PUBLIC (arg))
1748 vis = VISIBILITY_ANON;
1750 vis = DECL_VISIBILITY (arg);
1754 constrain_visibility (decl, vis);
1758 /* Like c_determine_visibility, but with additional C++-specific
1761 Function-scope entities can rely on the function's visibility because
1762 it is set in start_preparsed_function.
1764 Class-scope entities cannot rely on the class's visibility until the end
1765 of the enclosing class definition.
1767 Note that because namespaces have multiple independent definitions,
1768 namespace visibility is handled elsewhere using the #pragma visibility
1769 machinery rather than by decorating the namespace declaration.
1771 The goal is for constraints from the type to give a diagnostic, and
1772 other constraints to be applied silently. */
1775 determine_visibility (tree decl)
1777 tree class_type = NULL_TREE;
1780 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1782 /* Only relevant for names with external linkage. */
1783 if (!TREE_PUBLIC (decl))
1786 /* Cloned constructors and destructors get the same visibility as
1787 the underlying function. That should be set up in
1788 maybe_clone_body. */
1789 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1791 if (TREE_CODE (decl) == TYPE_DECL)
1793 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1794 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1795 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1800 else if (DECL_LANG_SPECIFIC (decl))
1801 use_template = DECL_USE_TEMPLATE (decl);
1805 /* If DECL is a member of a class, visibility specifiers on the
1806 class can influence the visibility of the DECL. */
1807 if (DECL_CLASS_SCOPE_P (decl))
1808 class_type = DECL_CONTEXT (decl);
1811 /* Not a class member. */
1813 /* Virtual tables have DECL_CONTEXT set to their associated class,
1814 so they are automatically handled above. */
1815 gcc_assert (TREE_CODE (decl) != VAR_DECL
1816 || !DECL_VTABLE_OR_VTT_P (decl));
1818 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1820 /* Local statics and classes get the visibility of their
1821 containing function by default, except that
1822 -fvisibility-inlines-hidden doesn't affect them. */
1823 tree fn = DECL_CONTEXT (decl);
1824 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1826 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1827 DECL_VISIBILITY_SPECIFIED (decl) =
1828 DECL_VISIBILITY_SPECIFIED (fn);
1831 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1833 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1834 but have no TEMPLATE_INFO, so don't try to check it. */
1837 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1838 && flag_visibility_ms_compat)
1840 /* Under -fvisibility-ms-compat, types are visible by default,
1841 even though their contents aren't. */
1842 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1843 int underlying_vis = type_visibility (underlying_type);
1844 if (underlying_vis == VISIBILITY_ANON
1845 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1846 constrain_visibility (decl, underlying_vis);
1848 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1850 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1852 /* tinfo visibility is based on the type it's for. */
1853 constrain_visibility
1854 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1856 else if (use_template)
1857 /* Template instantiations and specializations get visibility based
1858 on their template unless they override it with an attribute. */;
1859 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1861 /* Set default visibility to whatever the user supplied with
1862 #pragma GCC visibility or a namespace visibility attribute. */
1863 DECL_VISIBILITY (decl) = default_visibility;
1864 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1870 /* If the specialization doesn't specify visibility, use the
1871 visibility from the template. */
1872 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1873 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1874 : DECL_TEMPLATE_INFO (decl));
1875 tree args = TI_ARGS (tinfo);
1877 if (args != error_mark_node)
1879 int depth = TMPL_ARGS_DEPTH (args);
1880 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1882 if (!DECL_VISIBILITY_SPECIFIED (decl))
1884 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1885 DECL_VISIBILITY_SPECIFIED (decl)
1886 = DECL_VISIBILITY_SPECIFIED (pattern);
1889 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1890 if (args && depth > template_class_depth (class_type))
1891 /* Limit visibility based on its template arguments. */
1892 constrain_visibility_for_template (decl, args);
1897 determine_visibility_from_class (decl, class_type);
1899 if (decl_anon_ns_mem_p (decl))
1900 /* Names in an anonymous namespace get internal linkage.
1901 This might change once we implement export. */
1902 constrain_visibility (decl, VISIBILITY_ANON);
1903 else if (TREE_CODE (decl) != TYPE_DECL)
1905 /* Propagate anonymity from type to decl. */
1906 int tvis = type_visibility (TREE_TYPE (decl));
1907 if (tvis == VISIBILITY_ANON
1908 || ! DECL_VISIBILITY_SPECIFIED (decl))
1909 constrain_visibility (decl, tvis);
1913 /* By default, static data members and function members receive
1914 the visibility of their containing class. */
1917 determine_visibility_from_class (tree decl, tree class_type)
1919 if (DECL_VISIBILITY_SPECIFIED (decl))
1922 if (visibility_options.inlines_hidden
1923 /* Don't do this for inline templates; specializations might not be
1924 inline, and we don't want them to inherit the hidden
1925 visibility. We'll set it here for all inline instantiations. */
1926 && !processing_template_decl
1927 && TREE_CODE (decl) == FUNCTION_DECL
1928 && DECL_DECLARED_INLINE_P (decl)
1929 && (! DECL_LANG_SPECIFIC (decl)
1930 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1931 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1934 /* Default to the class visibility. */
1935 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1936 DECL_VISIBILITY_SPECIFIED (decl)
1937 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1940 /* Give the target a chance to override the visibility associated
1942 if (TREE_CODE (decl) == VAR_DECL
1943 && (DECL_TINFO_P (decl)
1944 || (DECL_VTABLE_OR_VTT_P (decl)
1945 /* Construction virtual tables are not exported because
1946 they cannot be referred to from other object files;
1947 their name is not standardized by the ABI. */
1948 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1949 && TREE_PUBLIC (decl)
1950 && !DECL_REALLY_EXTERN (decl)
1951 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1952 targetm.cxx.determine_class_data_visibility (decl);
1955 /* Constrain the visibility of a class TYPE based on the visibility of its
1956 field types. Warn if any fields require lesser visibility. */
1959 constrain_class_visibility (tree type)
1965 int vis = type_visibility (type);
1967 if (vis == VISIBILITY_ANON
1968 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1971 /* Don't warn about visibility if the class has explicit visibility. */
1972 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1973 vis = VISIBILITY_INTERNAL;
1975 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1976 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1978 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
1979 int subvis = type_visibility (ftype);
1981 if (subvis == VISIBILITY_ANON)
1983 if (!in_main_input_context ())
1985 %qT has a field %qD whose type uses the anonymous namespace",
1988 else if (IS_AGGR_TYPE (ftype)
1989 && vis < VISIBILITY_HIDDEN
1990 && subvis >= VISIBILITY_HIDDEN)
1991 warning (OPT_Wattributes, "\
1992 %qT declared with greater visibility than the type of its field %qD",
1996 binfo = TYPE_BINFO (type);
1997 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1999 int subvis = type_visibility (TREE_TYPE (t));
2001 if (subvis == VISIBILITY_ANON)
2003 if (!in_main_input_context())
2005 %qT has a base %qT whose type uses the anonymous namespace",
2006 type, TREE_TYPE (t));
2008 else if (vis < VISIBILITY_HIDDEN
2009 && subvis >= VISIBILITY_HIDDEN)
2010 warning (OPT_Wattributes, "\
2011 %qT declared with greater visibility than its base %qT",
2012 type, TREE_TYPE (t));
2016 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2017 for DECL has not already been determined, do so now by setting
2018 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2019 function is called entities with vague linkage whose definitions
2020 are available must have TREE_PUBLIC set.
2022 If this function decides to place DECL in COMDAT, it will set
2023 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2024 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2025 callers defer that decision until it is clear that DECL is actually
2029 import_export_decl (tree decl)
2034 tree class_type = NULL_TREE;
2036 if (DECL_INTERFACE_KNOWN (decl))
2039 /* We cannot determine what linkage to give to an entity with vague
2040 linkage until the end of the file. For example, a virtual table
2041 for a class will be defined if and only if the key method is
2042 defined in this translation unit. As a further example, consider
2043 that when compiling a translation unit that uses PCH file with
2044 "-frepo" it would be incorrect to make decisions about what
2045 entities to emit when building the PCH; those decisions must be
2046 delayed until the repository information has been processed. */
2047 gcc_assert (at_eof);
2048 /* Object file linkage for explicit instantiations is handled in
2049 mark_decl_instantiated. For static variables in functions with
2050 vague linkage, maybe_commonize_var is used.
2052 Therefore, the only declarations that should be provided to this
2053 function are those with external linkage that are:
2055 * implicit instantiations of function templates
2059 * implicit instantiations of static data members of class
2066 Furthermore, all entities that reach this point must have a
2067 definition available in this translation unit.
2069 The following assertions check these conditions. */
2070 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2071 || TREE_CODE (decl) == VAR_DECL);
2072 /* Any code that creates entities with TREE_PUBLIC cleared should
2073 also set DECL_INTERFACE_KNOWN. */
2074 gcc_assert (TREE_PUBLIC (decl));
2075 if (TREE_CODE (decl) == FUNCTION_DECL)
2076 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2077 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2078 || DECL_DECLARED_INLINE_P (decl));
2080 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2081 || DECL_VTABLE_OR_VTT_P (decl)
2082 || DECL_TINFO_P (decl));
2083 /* Check that a definition of DECL is available in this translation
2085 gcc_assert (!DECL_REALLY_EXTERN (decl));
2087 /* Assume that DECL will not have COMDAT linkage. */
2089 /* Assume that DECL will not be imported into this translation
2093 /* See if the repository tells us whether or not to emit DECL in
2094 this translation unit. */
2095 emit_p = repo_emit_p (decl);
2098 else if (emit_p == 1)
2100 /* The repository indicates that this entity should be defined
2101 here. Make sure the back end honors that request. */
2102 if (TREE_CODE (decl) == VAR_DECL)
2104 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2105 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2108 FOR_EACH_CLONE (clone, decl)
2109 mark_needed (clone);
2113 /* Output the definition as an ordinary strong definition. */
2114 DECL_EXTERNAL (decl) = 0;
2115 DECL_INTERFACE_KNOWN (decl) = 1;
2120 /* We have already decided what to do with this DECL; there is no
2121 need to check anything further. */
2123 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2125 class_type = DECL_CONTEXT (decl);
2126 import_export_class (class_type);
2127 if (TYPE_FOR_JAVA (class_type))
2129 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2130 && CLASSTYPE_INTERFACE_ONLY (class_type))
2132 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2133 && !CLASSTYPE_USE_TEMPLATE (class_type)
2134 && CLASSTYPE_KEY_METHOD (class_type)
2135 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2136 /* The ABI requires that all virtual tables be emitted with
2137 COMDAT linkage. However, on systems where COMDAT symbols
2138 don't show up in the table of contents for a static
2139 archive, or on systems without weak symbols (where we
2140 approximate COMDAT linkage by using internal linkage), the
2141 linker will report errors about undefined symbols because
2142 it will not see the virtual table definition. Therefore,
2143 in the case that we know that the virtual table will be
2144 emitted in only one translation unit, we make the virtual
2145 table an ordinary definition with external linkage. */
2146 DECL_EXTERNAL (decl) = 0;
2147 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2149 /* CLASS_TYPE is being exported from this translation unit,
2150 so DECL should be defined here. */
2151 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2152 /* If a class is declared in a header with the "extern
2153 template" extension, then it will not be instantiated,
2154 even in translation units that would normally require
2155 it. Often such classes are explicitly instantiated in
2156 one translation unit. Therefore, the explicit
2157 instantiation must be made visible to other translation
2159 DECL_EXTERNAL (decl) = 0;
2162 /* The generic C++ ABI says that class data is always
2163 COMDAT, even if there is a key function. Some
2164 variants (e.g., the ARM EABI) says that class data
2165 only has COMDAT linkage if the class data might be
2166 emitted in more than one translation unit. When the
2167 key method can be inline and is inline, we still have
2168 to arrange for comdat even though
2169 class_data_always_comdat is false. */
2170 if (!CLASSTYPE_KEY_METHOD (class_type)
2171 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2172 || targetm.cxx.class_data_always_comdat ())
2174 /* The ABI requires COMDAT linkage. Normally, we
2175 only emit COMDAT things when they are needed;
2176 make sure that we realize that this entity is
2183 else if (!flag_implicit_templates
2184 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2189 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2191 tree type = TREE_TYPE (DECL_NAME (decl));
2192 if (CLASS_TYPE_P (type))
2195 import_export_class (type);
2196 if (CLASSTYPE_INTERFACE_KNOWN (type)
2197 && TYPE_POLYMORPHIC_P (type)
2198 && CLASSTYPE_INTERFACE_ONLY (type)
2199 /* If -fno-rtti was specified, then we cannot be sure
2200 that RTTI information will be emitted with the
2201 virtual table of the class, so we must emit it
2202 wherever it is used. */
2207 if (CLASSTYPE_INTERFACE_KNOWN (type)
2208 && !CLASSTYPE_INTERFACE_ONLY (type))
2210 comdat_p = (targetm.cxx.class_data_always_comdat ()
2211 || (CLASSTYPE_KEY_METHOD (type)
2212 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2217 DECL_EXTERNAL (decl) = 0;
2227 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2228 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2230 /* DECL is an implicit instantiation of a function or static
2232 if (flag_implicit_templates
2233 || (flag_implicit_inline_templates
2234 && TREE_CODE (decl) == FUNCTION_DECL
2235 && DECL_DECLARED_INLINE_P (decl)))
2238 /* If we are not implicitly generating templates, then mark
2239 this entity as undefined in this translation unit. */
2242 else if (DECL_FUNCTION_MEMBER_P (decl))
2244 if (!DECL_DECLARED_INLINE_P (decl))
2246 tree ctype = DECL_CONTEXT (decl);
2247 import_export_class (ctype);
2248 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2250 DECL_NOT_REALLY_EXTERN (decl)
2251 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2252 || (DECL_DECLARED_INLINE_P (decl)
2253 && ! flag_implement_inlines
2254 && !DECL_VINDEX (decl)));
2256 if (!DECL_NOT_REALLY_EXTERN (decl))
2257 DECL_EXTERNAL (decl) = 1;
2259 /* Always make artificials weak. */
2260 if (DECL_ARTIFICIAL (decl) && flag_weak)
2263 maybe_make_one_only (decl);
2274 /* If we are importing DECL into this translation unit, mark is
2275 an undefined here. */
2276 DECL_EXTERNAL (decl) = 1;
2277 DECL_NOT_REALLY_EXTERN (decl) = 0;
2281 /* If we decided to put DECL in COMDAT, mark it accordingly at
2283 comdat_linkage (decl);
2286 DECL_INTERFACE_KNOWN (decl) = 1;
2289 /* Return an expression that performs the destruction of DECL, which
2290 must be a VAR_DECL whose type has a non-trivial destructor, or is
2291 an array whose (innermost) elements have a non-trivial destructor. */
2294 build_cleanup (tree decl)
2297 tree type = TREE_TYPE (decl);
2299 /* This function should only be called for declarations that really
2300 require cleanups. */
2301 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2303 /* Treat all objects with destructors as used; the destructor may do
2304 something substantive. */
2307 if (TREE_CODE (type) == ARRAY_TYPE)
2310 temp = build_address (decl);
2311 temp = build_delete (TREE_TYPE (temp), temp,
2312 sfk_complete_destructor,
2313 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2317 /* Returns the initialization guard variable for the variable DECL,
2318 which has static storage duration. */
2321 get_guard (tree decl)
2326 sname = mangle_guard_variable (decl);
2327 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2332 /* We use a type that is big enough to contain a mutex as well
2333 as an integer counter. */
2334 guard_type = targetm.cxx.guard_type ();
2335 guard = build_decl (VAR_DECL, sname, guard_type);
2337 /* The guard should have the same linkage as what it guards. */
2338 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2339 TREE_STATIC (guard) = TREE_STATIC (decl);
2340 DECL_COMMON (guard) = DECL_COMMON (decl);
2341 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2342 if (TREE_PUBLIC (decl))
2343 DECL_WEAK (guard) = DECL_WEAK (decl);
2344 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2345 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2347 DECL_ARTIFICIAL (guard) = 1;
2348 DECL_IGNORED_P (guard) = 1;
2349 TREE_USED (guard) = 1;
2350 pushdecl_top_level_and_finish (guard, NULL_TREE);
2355 /* Return those bits of the GUARD variable that should be set when the
2356 guarded entity is actually initialized. */
2359 get_guard_bits (tree guard)
2361 if (!targetm.cxx.guard_mask_bit ())
2363 /* We only set the first byte of the guard, in order to leave room
2364 for a mutex in the high-order bits. */
2365 guard = build1 (ADDR_EXPR,
2366 build_pointer_type (TREE_TYPE (guard)),
2368 guard = build1 (NOP_EXPR,
2369 build_pointer_type (char_type_node),
2371 guard = build1 (INDIRECT_REF, char_type_node, guard);
2377 /* Return an expression which determines whether or not the GUARD
2378 variable has already been initialized. */
2381 get_guard_cond (tree guard)
2385 /* Check to see if the GUARD is zero. */
2386 guard = get_guard_bits (guard);
2388 /* Mask off all but the low bit. */
2389 if (targetm.cxx.guard_mask_bit ())
2391 guard_value = integer_one_node;
2392 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2393 guard_value = convert (TREE_TYPE (guard), guard_value);
2394 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2397 guard_value = integer_zero_node;
2398 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2399 guard_value = convert (TREE_TYPE (guard), guard_value);
2400 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2403 /* Return an expression which sets the GUARD variable, indicating that
2404 the variable being guarded has been initialized. */
2407 set_guard (tree guard)
2411 /* Set the GUARD to one. */
2412 guard = get_guard_bits (guard);
2413 guard_init = integer_one_node;
2414 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2415 guard_init = convert (TREE_TYPE (guard), guard_init);
2416 return build_modify_expr (guard, NOP_EXPR, guard_init);
2419 /* Start the process of running a particular set of global constructors
2420 or destructors. Subroutine of do_[cd]tors. */
2423 start_objects (int method_type, int initp)
2429 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2431 if (initp != DEFAULT_INIT_PRIORITY)
2441 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2444 sprintf (type, "%c", method_type);
2446 fndecl = build_lang_decl (FUNCTION_DECL,
2447 get_file_function_name (type),
2448 build_function_type (void_type_node,
2450 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2452 TREE_PUBLIC (current_function_decl) = 0;
2454 /* Mark as artificial because it's not explicitly in the user's
2456 DECL_ARTIFICIAL (current_function_decl) = 1;
2458 /* Mark this declaration as used to avoid spurious warnings. */
2459 TREE_USED (current_function_decl) = 1;
2461 /* Mark this function as a global constructor or destructor. */
2462 if (method_type == 'I')
2463 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2465 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2466 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2468 body = begin_compound_stmt (BCS_FN_BODY);
2473 /* Finish the process of running a particular set of global constructors
2474 or destructors. Subroutine of do_[cd]tors. */
2477 finish_objects (int method_type, int initp, tree body)
2482 finish_compound_stmt (body);
2483 fn = finish_function (0);
2485 if (method_type == 'I')
2487 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2488 decl_init_priority_insert (fn, initp);
2492 DECL_STATIC_DESTRUCTOR (fn) = 1;
2493 decl_fini_priority_insert (fn, initp);
2496 expand_or_defer_fn (fn);
2499 /* The names of the parameters to the function created to handle
2500 initializations and destructions for objects with static storage
2502 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2503 #define PRIORITY_IDENTIFIER "__priority"
2505 /* The name of the function we create to handle initializations and
2506 destructions for objects with static storage duration. */
2507 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2509 /* The declaration for the __INITIALIZE_P argument. */
2510 static GTY(()) tree initialize_p_decl;
2512 /* The declaration for the __PRIORITY argument. */
2513 static GTY(()) tree priority_decl;
2515 /* The declaration for the static storage duration function. */
2516 static GTY(()) tree ssdf_decl;
2518 /* All the static storage duration functions created in this
2519 translation unit. */
2520 static GTY(()) VEC(tree,gc) *ssdf_decls;
2522 /* A map from priority levels to information about that priority
2523 level. There may be many such levels, so efficient lookup is
2525 static splay_tree priority_info_map;
2527 /* Begins the generation of the function that will handle all
2528 initialization and destruction of objects with static storage
2529 duration. The function generated takes two parameters of type
2530 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2531 nonzero, it performs initializations. Otherwise, it performs
2532 destructions. It only performs those initializations or
2533 destructions with the indicated __PRIORITY. The generated function
2536 It is assumed that this function will only be called once per
2537 translation unit. */
2540 start_static_storage_duration_function (unsigned count)
2545 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2547 /* Create the identifier for this function. It will be of the form
2548 SSDF_IDENTIFIER_<number>. */
2549 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2551 /* Create the parameters. */
2552 parm_types = void_list_node;
2553 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2554 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2555 type = build_function_type (void_type_node, parm_types);
2557 /* Create the FUNCTION_DECL itself. */
2558 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2559 get_identifier (id),
2561 TREE_PUBLIC (ssdf_decl) = 0;
2562 DECL_ARTIFICIAL (ssdf_decl) = 1;
2563 DECL_INLINE (ssdf_decl) = 1;
2565 /* Put this function in the list of functions to be called from the
2566 static constructors and destructors. */
2569 ssdf_decls = VEC_alloc (tree, gc, 32);
2571 /* Take this opportunity to initialize the map from priority
2572 numbers to information about that priority level. */
2573 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2574 /*delete_key_fn=*/0,
2575 /*delete_value_fn=*/
2576 (splay_tree_delete_value_fn) &free);
2578 /* We always need to generate functions for the
2579 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2580 priorities later, we'll be sure to find the
2581 DEFAULT_INIT_PRIORITY. */
2582 get_priority_info (DEFAULT_INIT_PRIORITY);
2585 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2587 /* Create the argument list. */
2588 initialize_p_decl = cp_build_parm_decl
2589 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2590 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2591 TREE_USED (initialize_p_decl) = 1;
2592 priority_decl = cp_build_parm_decl
2593 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2594 DECL_CONTEXT (priority_decl) = ssdf_decl;
2595 TREE_USED (priority_decl) = 1;
2597 TREE_CHAIN (initialize_p_decl) = priority_decl;
2598 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2600 /* Put the function in the global scope. */
2601 pushdecl (ssdf_decl);
2603 /* Start the function itself. This is equivalent to declaring the
2606 static void __ssdf (int __initialize_p, init __priority_p);
2608 It is static because we only need to call this function from the
2609 various constructor and destructor functions for this module. */
2610 start_preparsed_function (ssdf_decl,
2611 /*attrs=*/NULL_TREE,
2614 /* Set up the scope of the outermost block in the function. */
2615 body = begin_compound_stmt (BCS_FN_BODY);
2620 /* Finish the generation of the function which performs initialization
2621 and destruction of objects with static storage duration. After
2622 this point, no more such objects can be created. */
2625 finish_static_storage_duration_function (tree body)
2627 /* Close out the function. */
2628 finish_compound_stmt (body);
2629 expand_or_defer_fn (finish_function (0));
2632 /* Return the information about the indicated PRIORITY level. If no
2633 code to handle this level has yet been generated, generate the
2634 appropriate prologue. */
2636 static priority_info
2637 get_priority_info (int priority)
2642 n = splay_tree_lookup (priority_info_map,
2643 (splay_tree_key) priority);
2646 /* Create a new priority information structure, and insert it
2648 pi = XNEW (struct priority_info_s);
2649 pi->initializations_p = 0;
2650 pi->destructions_p = 0;
2651 splay_tree_insert (priority_info_map,
2652 (splay_tree_key) priority,
2653 (splay_tree_value) pi);
2656 pi = (priority_info) n->value;
2661 /* The effective initialization priority of a DECL. */
2663 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2664 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2665 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2667 /* Whether a DECL needs a guard to protect it against multiple
2670 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2671 || DECL_ONE_ONLY (decl) \
2672 || DECL_WEAK (decl)))
2674 /* Set up to handle the initialization or destruction of DECL. If
2675 INITP is nonzero, we are initializing the variable. Otherwise, we
2676 are destroying it. */
2679 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2681 tree guard_if_stmt = NULL_TREE;
2684 /* If we are supposed to destruct and there's a trivial destructor,
2685 nothing has to be done. */
2687 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2690 /* Trick the compiler into thinking we are at the file and line
2691 where DECL was declared so that error-messages make sense, and so
2692 that the debugger will show somewhat sensible file and line
2694 input_location = DECL_SOURCE_LOCATION (decl);
2700 Access control for implicit calls to the constructors,
2701 the conversion functions, or the destructor called to
2702 create and destroy a static data member is performed as
2703 if these calls appeared in the scope of the member's
2706 we pretend we are in a static member function of the class of
2707 which the DECL is a member. */
2708 if (member_p (decl))
2710 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2711 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2714 /* Assume we don't need a guard. */
2716 /* We need a guard if this is an object with external linkage that
2717 might be initialized in more than one place. (For example, a
2718 static data member of a template, when the data member requires
2720 if (NEEDS_GUARD_P (decl))
2724 guard = get_guard (decl);
2726 /* When using __cxa_atexit, we just check the GUARD as we would
2727 for a local static. */
2728 if (flag_use_cxa_atexit)
2730 /* When using __cxa_atexit, we never try to destroy
2731 anything from a static destructor. */
2733 guard_cond = get_guard_cond (guard);
2735 /* If we don't have __cxa_atexit, then we will be running
2736 destructors from .fini sections, or their equivalents. So,
2737 we need to know how many times we've tried to initialize this
2738 object. We do initializations only if the GUARD is zero,
2739 i.e., if we are the first to initialize the variable. We do
2740 destructions only if the GUARD is one, i.e., if we are the
2741 last to destroy the variable. */
2744 = cp_build_binary_op (EQ_EXPR,
2745 build_unary_op (PREINCREMENT_EXPR,
2751 = cp_build_binary_op (EQ_EXPR,
2752 build_unary_op (PREDECREMENT_EXPR,
2757 guard_if_stmt = begin_if_stmt ();
2758 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2762 /* If we're using __cxa_atexit, we have not already set the GUARD,
2763 so we must do so now. */
2764 if (guard && initp && flag_use_cxa_atexit)
2765 finish_expr_stmt (set_guard (guard));
2767 /* Perform the initialization or destruction. */
2771 finish_expr_stmt (init);
2773 /* If we're using __cxa_atexit, register a function that calls the
2774 destructor for the object. */
2775 if (flag_use_cxa_atexit)
2776 finish_expr_stmt (register_dtor_fn (decl));
2779 finish_expr_stmt (build_cleanup (decl));
2781 /* Finish the guard if-stmt, if necessary. */
2784 finish_then_clause (guard_if_stmt);
2785 finish_if_stmt (guard_if_stmt);
2788 /* Now that we're done with DECL we don't need to pretend to be a
2789 member of its class any longer. */
2790 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2791 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2794 /* Generate code to do the initialization or destruction of the decls in VARS,
2795 a TREE_LIST of VAR_DECL with static storage duration.
2796 Whether initialization or destruction is performed is specified by INITP. */
2799 do_static_initialization_or_destruction (tree vars, bool initp)
2801 tree node, init_if_stmt, cond;
2803 /* Build the outer if-stmt to check for initialization or destruction. */
2804 init_if_stmt = begin_if_stmt ();
2805 cond = initp ? integer_one_node : integer_zero_node;
2806 cond = cp_build_binary_op (EQ_EXPR,
2809 finish_if_stmt_cond (cond, init_if_stmt);
2813 tree decl = TREE_VALUE (node);
2814 tree priority_if_stmt;
2818 /* If we don't need a destructor, there's nothing to do. Avoid
2819 creating a possibly empty if-stmt. */
2820 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2822 node = TREE_CHAIN (node);
2826 /* Remember that we had an initialization or finalization at this
2828 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2829 pi = get_priority_info (priority);
2831 pi->initializations_p = 1;
2833 pi->destructions_p = 1;
2835 /* Conditionalize this initialization on being in the right priority
2836 and being initializing/finalizing appropriately. */
2837 priority_if_stmt = begin_if_stmt ();
2838 cond = cp_build_binary_op (EQ_EXPR,
2840 build_int_cst (NULL_TREE, priority));
2841 finish_if_stmt_cond (cond, priority_if_stmt);
2843 /* Process initializers with same priority. */
2845 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2846 node = TREE_CHAIN (node))
2847 /* Do one initialization or destruction. */
2848 one_static_initialization_or_destruction (TREE_VALUE (node),
2849 TREE_PURPOSE (node), initp);
2851 /* Finish up the priority if-stmt body. */
2852 finish_then_clause (priority_if_stmt);
2853 finish_if_stmt (priority_if_stmt);
2857 /* Finish up the init/destruct if-stmt body. */
2858 finish_then_clause (init_if_stmt);
2859 finish_if_stmt (init_if_stmt);
2862 /* VARS is a list of variables with static storage duration which may
2863 need initialization and/or finalization. Remove those variables
2864 that don't really need to be initialized or finalized, and return
2865 the resulting list. The order in which the variables appear in
2866 VARS is in reverse order of the order in which they should actually
2867 be initialized. The list we return is in the unreversed order;
2868 i.e., the first variable should be initialized first. */
2871 prune_vars_needing_no_initialization (tree *vars)
2874 tree result = NULL_TREE;
2879 tree decl = TREE_VALUE (t);
2880 tree init = TREE_PURPOSE (t);
2882 /* Deal gracefully with error. */
2883 if (decl == error_mark_node)
2885 var = &TREE_CHAIN (t);
2889 /* The only things that can be initialized are variables. */
2890 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2892 /* If this object is not defined, we don't need to do anything
2894 if (DECL_EXTERNAL (decl))
2896 var = &TREE_CHAIN (t);
2900 /* Also, if the initializer already contains errors, we can bail
2902 if (init && TREE_CODE (init) == TREE_LIST
2903 && value_member (error_mark_node, init))
2905 var = &TREE_CHAIN (t);
2909 /* This variable is going to need initialization and/or
2910 finalization, so we add it to the list. */
2911 *var = TREE_CHAIN (t);
2912 TREE_CHAIN (t) = result;
2919 /* Make sure we have told the back end about all the variables in
2923 write_out_vars (tree vars)
2927 for (v = vars; v; v = TREE_CHAIN (v))
2929 tree var = TREE_VALUE (v);
2930 if (!var_finalized_p (var))
2932 import_export_decl (var);
2933 rest_of_decl_compilation (var, 1, 1);
2938 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2939 (otherwise) that will initialize all global objects with static
2940 storage duration having the indicated PRIORITY. */
2943 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2952 input_location = *locus;
2953 #ifdef USE_MAPPED_LOCATION
2959 /* We use `I' to indicate initialization and `D' to indicate
2961 function_key = constructor_p ? 'I' : 'D';
2963 /* We emit the function lazily, to avoid generating empty
2964 global constructors and destructors. */
2967 /* For Objective-C++, we may need to initialize metadata found in this module.
2968 This must be done _before_ any other static initializations. */
2969 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2970 && constructor_p && objc_static_init_needed_p ())
2972 body = start_objects (function_key, priority);
2973 objc_generate_static_init_call (NULL_TREE);
2976 /* Call the static storage duration function with appropriate
2978 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2980 /* Calls to pure or const functions will expand to nothing. */
2981 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2984 body = start_objects (function_key, priority);
2986 arguments = tree_cons (NULL_TREE,
2987 build_int_cst (NULL_TREE, priority),
2989 arguments = tree_cons (NULL_TREE,
2990 build_int_cst (NULL_TREE, constructor_p),
2992 finish_expr_stmt (build_function_call (fndecl, arguments));
2996 /* Close out the function. */
2998 finish_objects (function_key, priority, body);
3001 /* Generate constructor and destructor functions for the priority
3005 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3007 location_t *locus = (location_t *) data;
3008 int priority = (int) n->key;
3009 priority_info pi = (priority_info) n->value;
3011 /* Generate the functions themselves, but only if they are really
3013 if (pi->initializations_p)
3014 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3015 if (pi->destructions_p)
3016 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3018 /* Keep iterating. */
3022 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3023 decls referenced from front-end specific constructs; it will be called
3024 only for language-specific tree nodes.
3026 Here we must deal with member pointers. */
3029 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
3030 tree from ATTRIBUTE_UNUSED)
3034 switch (TREE_CODE (t))
3037 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3038 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3041 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3042 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3045 if (DECL_VTABLE_OR_VTT_P (t))
3047 /* The ABI requires that all virtual tables be emitted
3048 whenever one of them is. */
3050 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3052 vtbl = TREE_CHAIN (vtbl))
3053 mark_decl_referenced (vtbl);
3055 else if (DECL_CONTEXT (t)
3056 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3057 /* If we need a static variable in a function, then we
3058 need the containing function. */
3059 mark_decl_referenced (DECL_CONTEXT (t));
3068 /* Java requires that we be able to reference a local address for a
3069 method, and not be confused by PLT entries. If hidden aliases are
3070 supported, emit one for each java function that we've emitted. */
3073 build_java_method_aliases (void)
3075 struct cgraph_node *node;
3077 #ifndef HAVE_GAS_HIDDEN
3081 for (node = cgraph_nodes; node ; node = node->next)
3083 tree fndecl = node->decl;
3085 if (TREE_ASM_WRITTEN (fndecl)
3086 && DECL_CONTEXT (fndecl)
3087 && TYPE_P (DECL_CONTEXT (fndecl))
3088 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3089 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3091 /* Mangle the name in a predictable way; we need to reference
3092 this from a java compiled object file. */
3093 tree oid, nid, alias;
3097 oid = DECL_ASSEMBLER_NAME (fndecl);
3098 oname = IDENTIFIER_POINTER (oid);
3099 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3100 nname = ACONCAT (("_ZGA", oname+2, NULL));
3101 nid = get_identifier (nname);
3103 alias = make_alias_for (fndecl, nid);
3104 TREE_PUBLIC (alias) = 1;
3105 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3107 assemble_alias (alias, oid);
3112 /* This routine is called at the end of compilation.
3113 Its job is to create all the code needed to initialize and
3114 destroy the global aggregates. We do the destruction
3115 first, since that way we only need to reverse the decls once. */
3118 cp_write_global_declarations (void)
3124 unsigned ssdf_count = 0;
3128 locus = input_location;
3131 /* Bad parse errors. Just forget about it. */
3132 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3136 c_common_write_pch ();
3138 #ifdef USE_MAPPED_LOCATION
3141 /* Otherwise, GDB can get confused, because in only knows
3142 about source for LINENO-1 lines. */
3146 /* We now have to write out all the stuff we put off writing out.
3149 o Template specializations that we have not yet instantiated,
3150 but which are needed.
3151 o Initialization and destruction for non-local objects with
3152 static storage duration. (Local objects with static storage
3153 duration are initialized when their scope is first entered,
3154 and are cleaned up via atexit.)
3155 o Virtual function tables.
3157 All of these may cause others to be needed. For example,
3158 instantiating one function may cause another to be needed, and
3159 generating the initializer for an object may cause templates to be
3160 instantiated, etc., etc. */
3162 timevar_push (TV_VARCONST);
3164 emit_support_tinfos ();
3173 /* If there are templates that we've put off instantiating, do
3175 instantiate_pending_templates (retries);
3178 /* Write out virtual tables as required. Note that writing out
3179 the virtual table for a template class may cause the
3180 instantiation of members of that class. If we write out
3181 vtables then we remove the class from our list so we don't
3182 have to look at it again. */
3184 while (keyed_classes != NULL_TREE
3185 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3188 keyed_classes = TREE_CHAIN (keyed_classes);
3194 tree next = TREE_CHAIN (t);
3198 if (maybe_emit_vtables (TREE_VALUE (next)))
3201 TREE_CHAIN (t) = TREE_CHAIN (next);
3206 next = TREE_CHAIN (t);
3210 /* Write out needed type info variables. We have to be careful
3211 looping through unemitted decls, because emit_tinfo_decl may
3212 cause other variables to be needed. New elements will be
3213 appended, and we remove from the vector those that actually
3215 for (i = VEC_length (tree, unemitted_tinfo_decls);
3216 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3217 if (emit_tinfo_decl (t))
3220 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3223 /* The list of objects with static storage duration is built up
3224 in reverse order. We clear STATIC_AGGREGATES so that any new
3225 aggregates added during the initialization of these will be
3226 initialized in the correct order when we next come around the
3228 vars = prune_vars_needing_no_initialization (&static_aggregates);
3232 /* We need to start a new initialization function each time
3233 through the loop. That's because we need to know which
3234 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3235 isn't computed until a function is finished, and written
3236 out. That's a deficiency in the back end. When this is
3237 fixed, these initialization functions could all become
3238 inline, with resulting performance improvements. */
3241 /* Set the line and file, so that it is obviously not from
3243 input_location = locus;
3244 ssdf_body = start_static_storage_duration_function (ssdf_count);
3246 /* Make sure the back end knows about all the variables. */
3247 write_out_vars (vars);
3249 /* First generate code to do all the initializations. */
3251 do_static_initialization_or_destruction (vars, /*initp=*/true);
3253 /* Then, generate code to do all the destructions. Do these
3254 in reverse order so that the most recently constructed
3255 variable is the first destroyed. If we're using
3256 __cxa_atexit, then we don't need to do this; functions
3257 were registered at initialization time to destroy the
3259 if (!flag_use_cxa_atexit && vars)
3261 vars = nreverse (vars);
3262 do_static_initialization_or_destruction (vars, /*initp=*/false);
3267 /* Finish up the static storage duration function for this
3269 input_location = locus;
3270 finish_static_storage_duration_function (ssdf_body);
3272 /* All those initializations and finalizations might cause
3273 us to need more inline functions, more template
3274 instantiations, etc. */
3277 #ifdef USE_MAPPED_LOCATION
3284 /* Go through the set of inline functions whose bodies have not
3285 been emitted yet. If out-of-line copies of these functions
3286 are required, emit them. */
3287 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3289 /* Does it need synthesizing? */
3290 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3291 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3293 /* Even though we're already at the top-level, we push
3294 there again. That way, when we pop back a few lines
3295 hence, all of our state is restored. Otherwise,
3296 finish_function doesn't clean things up, and we end
3297 up with CURRENT_FUNCTION_DECL set. */
3298 push_to_top_level ();
3299 /* The decl's location will mark where it was first
3300 needed. Save that so synthesize method can indicate
3301 where it was needed from, in case of error */
3302 input_location = DECL_SOURCE_LOCATION (decl);
3303 synthesize_method (decl);
3304 pop_from_top_level ();
3308 if (!DECL_SAVED_TREE (decl))
3311 /* We lie to the back end, pretending that some functions
3312 are not defined when they really are. This keeps these
3313 functions from being put out unnecessarily. But, we must
3314 stop lying when the functions are referenced, or if they
3315 are not comdat since they need to be put out now. If
3316 DECL_INTERFACE_KNOWN, then we have already set
3317 DECL_EXTERNAL appropriately, so there's no need to check
3318 again, and we do not want to clear DECL_EXTERNAL if a
3319 previous call to import_export_decl set it.
3321 This is done in a separate for cycle, because if some
3322 deferred function is contained in another deferred
3323 function later in deferred_fns varray,
3324 rest_of_compilation would skip this function and we
3325 really cannot expand the same function twice. */
3326 import_export_decl (decl);
3327 if (DECL_NOT_REALLY_EXTERN (decl)
3328 && DECL_INITIAL (decl)
3329 && decl_needed_p (decl))
3330 DECL_EXTERNAL (decl) = 0;
3332 /* If we're going to need to write this function out, and
3333 there's already a body for it, create RTL for it now.
3334 (There might be no body if this is a method we haven't
3335 gotten around to synthesizing yet.) */
3336 if (!DECL_EXTERNAL (decl)
3337 && decl_needed_p (decl)
3338 && !TREE_ASM_WRITTEN (decl)
3339 && !cgraph_node (decl)->local.finalized)
3341 /* We will output the function; no longer consider it in this
3343 DECL_DEFER_OUTPUT (decl) = 0;
3344 /* Generate RTL for this function now that we know we
3346 expand_or_defer_fn (decl);
3347 /* If we're compiling -fsyntax-only pretend that this
3348 function has been written out so that we don't try to
3350 if (flag_syntax_only)
3351 TREE_ASM_WRITTEN (decl) = 1;
3356 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3359 /* Static data members are just like namespace-scope globals. */
3360 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3362 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3364 import_export_decl (decl);
3365 /* If this static data member is needed, provide it to the
3367 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3368 DECL_EXTERNAL (decl) = 0;
3370 if (VEC_length (tree, pending_statics) != 0
3371 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3372 VEC_length (tree, pending_statics)))
3379 /* All used inline functions must have a definition at this point. */
3380 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3382 if (/* Check online inline functions that were actually used. */
3383 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3384 /* If the definition actually was available here, then the
3385 fact that the function was not defined merely represents
3386 that for some reason (use of a template repository,
3387 #pragma interface, etc.) we decided not to emit the
3389 && !DECL_INITIAL (decl)
3390 /* An explicit instantiation can be used to specify
3391 that the body is in another unit. It will have
3392 already verified there was a definition. */
3393 && !DECL_EXPLICIT_INSTANTIATION (decl))
3395 warning (0, "inline function %q+D used but never defined", decl);
3396 /* Avoid a duplicate warning from check_global_declaration_1. */
3397 TREE_NO_WARNING (decl) = 1;
3401 /* We give C linkage to static constructors and destructors. */
3402 push_lang_context (lang_name_c);
3404 /* Generate initialization and destruction functions for all
3405 priorities for which they are required. */
3406 if (priority_info_map)
3407 splay_tree_foreach (priority_info_map,
3408 generate_ctor_and_dtor_functions_for_priority,
3410 else if (c_dialect_objc () && objc_static_init_needed_p ())
3411 /* If this is obj-c++ and we need a static init, call
3412 generate_ctor_or_dtor_function. */
3413 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3414 DEFAULT_INIT_PRIORITY, &locus);
3416 /* We're done with the splay-tree now. */
3417 if (priority_info_map)
3418 splay_tree_delete (priority_info_map);
3420 /* Generate any missing aliases. */
3421 maybe_apply_pending_pragma_weaks ();
3423 /* We're done with static constructors, so we can go back to "C++"
3425 pop_lang_context ();
3427 cgraph_finalize_compilation_unit ();
3430 /* Now, issue warnings about static, but not defined, functions,
3431 etc., and emit debugging information. */
3432 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3433 if (VEC_length (tree, pending_statics) != 0)
3435 check_global_declarations (VEC_address (tree, pending_statics),
3436 VEC_length (tree, pending_statics));
3437 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3438 VEC_length (tree, pending_statics));
3441 /* Generate hidden aliases for Java. */
3442 build_java_method_aliases ();
3446 /* The entire file is now complete. If requested, dump everything
3450 FILE *stream = dump_begin (TDI_tu, &flags);
3454 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3455 dump_end (TDI_tu, stream);
3459 timevar_pop (TV_VARCONST);
3461 if (flag_detailed_statistics)
3463 dump_tree_statistics ();
3464 dump_time_statistics ();
3466 input_location = locus;
3468 #ifdef ENABLE_CHECKING
3469 validate_conversion_obstack ();
3470 #endif /* ENABLE_CHECKING */
3473 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3474 function to call in parse-tree form; it has not yet been
3475 semantically analyzed. ARGS are the arguments to the function.
3476 They have already been semantically analyzed. */
3479 build_offset_ref_call_from_tree (tree fn, tree args)
3488 object = TREE_OPERAND (fn, 0);
3490 if (processing_template_decl)
3492 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3493 || TREE_CODE (fn) == MEMBER_REF);
3494 if (type_dependent_expression_p (fn)
3495 || any_type_dependent_arguments_p (args))
3496 return build_nt_call_list (fn, args);
3498 /* Transform the arguments and add the implicit "this"
3499 parameter. That must be done before the FN is transformed
3500 because we depend on the form of FN. */
3501 args = build_non_dependent_args (args);
3502 object = build_non_dependent_expr (object);
3503 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3504 object = build_unary_op (ADDR_EXPR, object, 0);
3505 args = tree_cons (NULL_TREE, object, args);
3506 /* Now that the arguments are done, transform FN. */
3507 fn = build_non_dependent_expr (fn);
3510 /* A qualified name corresponding to a bound pointer-to-member is
3511 represented as an OFFSET_REF:
3513 struct B { void g(); };
3515 void B::g() { (this->*p)(); } */
3516 if (TREE_CODE (fn) == OFFSET_REF)
3518 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3519 fn = TREE_OPERAND (fn, 1);
3520 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3521 args = tree_cons (NULL_TREE, object_addr, args);
3524 expr = build_function_call (fn, args);
3525 if (processing_template_decl && expr != error_mark_node)
3526 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3532 check_default_args (tree x)
3534 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3535 bool saw_def = false;
3536 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3537 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3539 if (TREE_PURPOSE (arg))
3543 error ("default argument missing for parameter %P of %q+#D", i, x);
3544 TREE_PURPOSE (arg) = error_mark_node;
3549 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3550 If DECL is a specialization or implicitly declared class member,
3551 generate the actual definition. */
3554 mark_used (tree decl)
3556 HOST_WIDE_INT saved_processing_template_decl = 0;
3558 /* If DECL is a BASELINK for a single function, then treat it just
3559 like the DECL for the function. Otherwise, if the BASELINK is
3560 for an overloaded function, we don't know which function was
3561 actually used until after overload resolution. */
3562 if (TREE_CODE (decl) == BASELINK)
3564 decl = BASELINK_FUNCTIONS (decl);
3565 if (really_overloaded_fn (decl))
3567 decl = OVL_CURRENT (decl);
3570 TREE_USED (decl) = 1;
3571 if (DECL_CLONED_FUNCTION_P (decl))
3572 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3573 /* If we don't need a value, then we don't need to synthesize DECL. */
3574 if (skip_evaluation)
3576 /* Normally, we can wait until instantiation-time to synthesize
3577 DECL. However, if DECL is a static data member initialized with
3578 a constant, we need the value right now because a reference to
3579 such a data member is not value-dependent. */
3580 if (TREE_CODE (decl) == VAR_DECL
3581 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3582 && DECL_CLASS_SCOPE_P (decl))
3584 /* Don't try to instantiate members of dependent types. We
3585 cannot just use dependent_type_p here because this function
3586 may be called from fold_non_dependent_expr, and then we may
3587 see dependent types, even though processing_template_decl
3589 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3590 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3592 /* Pretend that we are not in a template, even if we are, so
3593 that the static data member initializer will be processed. */
3594 saved_processing_template_decl = processing_template_decl;
3595 processing_template_decl = 0;
3598 if (processing_template_decl)
3601 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3602 && !TREE_ASM_WRITTEN (decl))
3603 /* Remember it, so we can check it was defined. */
3605 if (DECL_DEFERRED_FN (decl))
3608 /* Remember the current location for a function we will end up
3609 synthesizing. Then we can inform the user where it was
3610 required in the case of error. */
3611 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3612 && !DECL_THUNK_P (decl))
3613 DECL_SOURCE_LOCATION (decl) = input_location;
3615 note_vague_linkage_fn (decl);
3618 assemble_external (decl);
3620 /* Is it a synthesized method that needs to be synthesized? */
3621 if (TREE_CODE (decl) == FUNCTION_DECL
3622 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3623 && DECL_ARTIFICIAL (decl)
3624 && !DECL_THUNK_P (decl)
3625 && ! DECL_INITIAL (decl)
3626 /* Kludge: don't synthesize for default args. Unfortunately this
3627 rules out initializers of namespace-scoped objects too, but
3628 it's sort-of ok if the implicit ctor or dtor decl keeps
3629 pointing to the class location. */
3630 && current_function_decl)
3632 synthesize_method (decl);
3633 /* If we've already synthesized the method we don't need to
3634 do the instantiation test below. */
3636 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3637 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3638 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3639 || (TREE_CODE (decl) == FUNCTION_DECL
3640 && DECL_INLINE (DECL_TEMPLATE_RESULT
3641 (template_for_substitution (decl))))
3642 /* We need to instantiate static data members so that there
3643 initializers are available in integral constant
3645 || (TREE_CODE (decl) == VAR_DECL
3646 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3647 /* If this is a function or variable that is an instance of some
3648 template, we now know that we will need to actually do the
3649 instantiation. We check that DECL is not an explicit
3650 instantiation because that is not checked in instantiate_decl.
3652 We put off instantiating functions in order to improve compile
3653 times. Maintaining a stack of active functions is expensive,
3654 and the inliner knows to instantiate any functions it might
3655 need. Therefore, we always try to defer instantiation. */
3656 instantiate_decl (decl, /*defer_ok=*/true,
3657 /*expl_inst_class_mem_p=*/false);
3659 processing_template_decl = saved_processing_template_decl;
3662 #include "gt-cp-decl2.h"