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);
991 /* Unknown attribute. */
994 /* If any of the arguments are dependent expressions, we can't evaluate
995 the attribute until instantiation time. */
996 for (arg = args; arg; arg = TREE_CHAIN (arg))
998 tree t = TREE_VALUE (arg);
999 if (value_dependent_expression_p (t)
1000 || type_dependent_expression_p (t))
1004 if (TREE_CODE (decl) == TYPE_DECL
1006 || spec->type_required)
1008 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1010 /* We can't apply any attributes to a completely unknown type until
1011 instantiation time. */
1012 enum tree_code code = TREE_CODE (type);
1013 if (code == TEMPLATE_TYPE_PARM
1014 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1015 || code == TYPENAME_TYPE)
1017 /* Also defer attributes on dependent types. This is not necessary
1018 in all cases, but is the better default. */
1019 else if (dependent_type_p (type))
1028 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1029 applied at instantiation time and return them. If IS_DEPENDENT is true,
1030 the declaration itself is dependent, so all attributes should be applied
1031 at instantiation time. */
1034 splice_template_attributes (tree *attr_p, tree decl)
1037 tree late_attrs = NULL_TREE;
1038 tree *q = &late_attrs;
1045 if (is_late_template_attribute (*p, decl))
1047 ATTR_IS_DEPENDENT (*p) = 1;
1049 *p = TREE_CHAIN (*p);
1050 q = &TREE_CHAIN (*q);
1054 p = &TREE_CHAIN (*p);
1060 /* Remove any late attributes from the list in ATTR_P and attach them to
1064 save_template_attributes (tree *attr_p, tree *decl_p)
1066 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1072 /* Give this type a name so we know to look it up again at instantiation
1074 if (TREE_CODE (*decl_p) == TYPE_DECL
1075 && DECL_ORIGINAL_TYPE (*decl_p) == NULL_TREE)
1077 tree oldt = TREE_TYPE (*decl_p);
1078 tree newt = build_variant_type_copy (oldt);
1079 DECL_ORIGINAL_TYPE (*decl_p) = oldt;
1080 TREE_TYPE (*decl_p) = newt;
1081 TYPE_NAME (newt) = *decl_p;
1082 TREE_USED (newt) = TREE_USED (*decl_p);
1085 if (DECL_P (*decl_p))
1086 q = &DECL_ATTRIBUTES (*decl_p);
1088 q = &TYPE_ATTRIBUTES (*decl_p);
1091 q = &TREE_CHAIN (tree_last (*q));
1095 /* Like decl_attributes, but handle C++ complexity. */
1098 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1100 if (*decl == NULL_TREE || *decl == void_type_node
1101 || *decl == error_mark_node
1102 || attributes == NULL_TREE)
1105 if (processing_template_decl)
1107 save_template_attributes (&attributes, decl);
1108 if (attributes == NULL_TREE)
1112 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1113 decl = &DECL_TEMPLATE_RESULT (*decl);
1115 decl_attributes (decl, attributes, flags);
1117 if (TREE_CODE (*decl) == TYPE_DECL)
1118 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1121 /* Walks through the namespace- or function-scope anonymous union
1122 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1123 Returns one of the fields for use in the mangled name. */
1126 build_anon_union_vars (tree type, tree object)
1128 tree main_decl = NULL_TREE;
1131 /* Rather than write the code to handle the non-union case,
1132 just give an error. */
1133 if (TREE_CODE (type) != UNION_TYPE)
1134 error ("anonymous struct not inside named type");
1136 for (field = TYPE_FIELDS (type);
1138 field = TREE_CHAIN (field))
1143 if (DECL_ARTIFICIAL (field))
1145 if (TREE_CODE (field) != FIELD_DECL)
1147 pedwarn ("%q+#D invalid; an anonymous union can only "
1148 "have non-static data members", field);
1152 if (TREE_PRIVATE (field))
1153 pedwarn ("private member %q+#D in anonymous union", field);
1154 else if (TREE_PROTECTED (field))
1155 pedwarn ("protected member %q+#D in anonymous union", field);
1157 if (processing_template_decl)
1158 ref = build_min_nt (COMPONENT_REF, object,
1159 DECL_NAME (field), NULL_TREE);
1161 ref = build_class_member_access_expr (object, field, NULL_TREE,
1164 if (DECL_NAME (field))
1168 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1169 DECL_ANON_UNION_VAR_P (decl) = 1;
1171 base = get_base_address (object);
1172 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1173 TREE_STATIC (decl) = TREE_STATIC (base);
1174 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1176 SET_DECL_VALUE_EXPR (decl, ref);
1177 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1179 decl = pushdecl (decl);
1181 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1182 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1186 if (main_decl == NULL_TREE)
1193 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1194 anonymous union, then all members must be laid out together. PUBLIC_P
1195 is nonzero if this union is not declared static. */
1198 finish_anon_union (tree anon_union_decl)
1204 if (anon_union_decl == error_mark_node)
1207 type = TREE_TYPE (anon_union_decl);
1208 public_p = TREE_PUBLIC (anon_union_decl);
1210 /* The VAR_DECL's context is the same as the TYPE's context. */
1211 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1213 if (TYPE_FIELDS (type) == NULL_TREE)
1218 error ("namespace-scope anonymous aggregates must be static");
1222 main_decl = build_anon_union_vars (type, anon_union_decl);
1223 if (main_decl == error_mark_node)
1225 if (main_decl == NULL_TREE)
1227 warning (0, "anonymous union with no members");
1231 if (!processing_template_decl)
1233 /* Use main_decl to set the mangled name. */
1234 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1235 mangle_decl (anon_union_decl);
1236 DECL_NAME (anon_union_decl) = NULL_TREE;
1239 pushdecl (anon_union_decl);
1240 if (building_stmt_tree ()
1241 && at_function_scope_p ())
1242 add_decl_expr (anon_union_decl);
1243 else if (!processing_template_decl)
1244 rest_of_decl_compilation (anon_union_decl,
1245 toplevel_bindings_p (), at_eof);
1248 /* Auxiliary functions to make type signatures for
1249 `operator new' and `operator delete' correspond to
1250 what compiler will be expecting. */
1253 coerce_new_type (tree type)
1256 tree args = TYPE_ARG_TYPES (type);
1258 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1260 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1263 error ("%<operator new%> must return type %qT", ptr_type_node);
1266 if (args && args != void_list_node)
1268 if (TREE_PURPOSE (args))
1270 /* [basic.stc.dynamic.allocation]
1272 The first parameter shall not have an associated default
1274 error ("the first parameter of %<operator new%> cannot "
1275 "have a default argument");
1276 /* Throw away the default argument. */
1277 TREE_PURPOSE (args) = NULL_TREE;
1280 if (!same_type_p (TREE_VALUE (args), size_type_node))
1283 args = TREE_CHAIN (args);
1290 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1291 "as first parameter", size_type_node);
1296 args = tree_cons (NULL_TREE, size_type_node, args);
1299 type = build_exception_variant
1300 (build_function_type (ptr_type_node, args),
1301 TYPE_RAISES_EXCEPTIONS (type));
1309 coerce_delete_type (tree type)
1312 tree args = TYPE_ARG_TYPES (type);
1314 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1316 if (!same_type_p (TREE_TYPE (type), void_type_node))
1319 error ("%<operator delete%> must return type %qT", void_type_node);
1322 if (!args || args == void_list_node
1323 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1326 if (args && args != void_list_node)
1327 args = TREE_CHAIN (args);
1328 error ("%<operator delete%> takes type %qT as first parameter",
1334 args = tree_cons (NULL_TREE, ptr_type_node, args);
1337 type = build_exception_variant
1338 (build_function_type (void_type_node, args),
1339 TYPE_RAISES_EXCEPTIONS (type));
1347 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1348 and mark them as needed. */
1351 mark_vtable_entries (tree decl)
1354 unsigned HOST_WIDE_INT idx;
1356 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1361 STRIP_NOPS (fnaddr);
1363 if (TREE_CODE (fnaddr) != ADDR_EXPR
1364 && TREE_CODE (fnaddr) != FDESC_EXPR)
1365 /* This entry is an offset: a virtual base class offset, a
1366 virtual call offset, an RTTI offset, etc. */
1369 fn = TREE_OPERAND (fnaddr, 0);
1370 TREE_ADDRESSABLE (fn) = 1;
1371 /* When we don't have vcall offsets, we output thunks whenever
1372 we output the vtables that contain them. With vcall offsets,
1373 we know all the thunks we'll need when we emit a virtual
1374 function, so we emit the thunks there instead. */
1375 if (DECL_THUNK_P (fn))
1376 use_thunk (fn, /*emit_p=*/0);
1381 /* Set DECL up to have the closest approximation of "initialized common"
1382 linkage available. */
1385 comdat_linkage (tree decl)
1388 make_decl_one_only (decl);
1389 else if (TREE_CODE (decl) == FUNCTION_DECL
1390 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1391 /* We can just emit function and compiler-generated variables
1392 statically; having multiple copies is (for the most part) only
1395 There are two correctness issues, however: the address of a
1396 template instantiation with external linkage should be the
1397 same, independent of what translation unit asks for the
1398 address, and this will not hold when we emit multiple copies of
1399 the function. However, there's little else we can do.
1401 Also, by default, the typeinfo implementation assumes that
1402 there will be only one copy of the string used as the name for
1403 each type. Therefore, if weak symbols are unavailable, the
1404 run-time library should perform a more conservative check; it
1405 should perform a string comparison, rather than an address
1407 TREE_PUBLIC (decl) = 0;
1410 /* Static data member template instantiations, however, cannot
1411 have multiple copies. */
1412 if (DECL_INITIAL (decl) == 0
1413 || DECL_INITIAL (decl) == error_mark_node)
1414 DECL_COMMON (decl) = 1;
1415 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1417 DECL_COMMON (decl) = 1;
1418 DECL_INITIAL (decl) = error_mark_node;
1420 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1422 /* We can't do anything useful; leave vars for explicit
1424 DECL_EXTERNAL (decl) = 1;
1425 DECL_NOT_REALLY_EXTERN (decl) = 0;
1429 if (DECL_LANG_SPECIFIC (decl))
1430 DECL_COMDAT (decl) = 1;
1433 /* For win32 we also want to put explicit instantiations in
1434 linkonce sections, so that they will be merged with implicit
1435 instantiations; otherwise we get duplicate symbol errors.
1436 For Darwin we do not want explicit instantiations to be
1440 maybe_make_one_only (tree decl)
1442 /* We used to say that this was not necessary on targets that support weak
1443 symbols, because the implicit instantiations will defer to the explicit
1444 one. However, that's not actually the case in SVR4; a strong definition
1445 after a weak one is an error. Also, not making explicit
1446 instantiations one_only means that we can end up with two copies of
1447 some template instantiations. */
1451 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1452 we can get away with not emitting them if they aren't used. We need
1453 to for variables so that cp_finish_decl will update their linkage,
1454 because their DECL_INITIAL may not have been set properly yet. */
1456 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1457 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1458 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1460 make_decl_one_only (decl);
1462 if (TREE_CODE (decl) == VAR_DECL)
1464 DECL_COMDAT (decl) = 1;
1465 /* Mark it needed so we don't forget to emit it. */
1466 mark_decl_referenced (decl);
1471 /* Determine whether or not we want to specifically import or export CTYPE,
1472 using various heuristics. */
1475 import_export_class (tree ctype)
1477 /* -1 for imported, 1 for exported. */
1478 int import_export = 0;
1480 /* It only makes sense to call this function at EOF. The reason is
1481 that this function looks at whether or not the first non-inline
1482 non-abstract virtual member function has been defined in this
1483 translation unit. But, we can't possibly know that until we've
1484 seen the entire translation unit. */
1485 gcc_assert (at_eof);
1487 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1490 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1491 we will have CLASSTYPE_INTERFACE_ONLY set but not
1492 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1493 heuristic because someone will supply a #pragma implementation
1494 elsewhere, and deducing it here would produce a conflict. */
1495 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1498 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1500 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1502 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1503 && !flag_implicit_templates)
1504 /* For a template class, without -fimplicit-templates, check the
1505 repository. If the virtual table is assigned to this
1506 translation unit, then export the class; otherwise, import
1508 import_export = repo_export_class_p (ctype) ? 1 : -1;
1509 else if (TYPE_POLYMORPHIC_P (ctype))
1511 /* The ABI specifies that the virtual table and associated
1512 information are emitted with the key method, if any. */
1513 tree method = CLASSTYPE_KEY_METHOD (ctype);
1514 /* If weak symbol support is not available, then we must be
1515 careful not to emit the vtable when the key function is
1516 inline. An inline function can be defined in multiple
1517 translation units. If we were to emit the vtable in each
1518 translation unit containing a definition, we would get
1519 multiple definition errors at link-time. */
1520 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1521 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1524 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1525 a definition anywhere else. */
1526 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1529 /* Allow back ends the chance to overrule the decision. */
1530 if (targetm.cxx.import_export_class)
1531 import_export = targetm.cxx.import_export_class (ctype, import_export);
1535 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1536 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1540 /* Return true if VAR has already been provided to the back end; in that
1541 case VAR should not be modified further by the front end. */
1543 var_finalized_p (tree var)
1545 return varpool_node (var)->finalized;
1548 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1549 must be emitted in this translation unit. Mark it as such. */
1552 mark_needed (tree decl)
1554 /* It's possible that we no longer need to set
1555 TREE_SYMBOL_REFERENCED here directly, but doing so is
1557 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1558 mark_decl_referenced (decl);
1561 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1562 returns true if a definition of this entity should be provided in
1563 this object file. Callers use this function to determine whether
1564 or not to let the back end know that a definition of DECL is
1565 available in this translation unit. */
1568 decl_needed_p (tree decl)
1570 gcc_assert (TREE_CODE (decl) == VAR_DECL
1571 || TREE_CODE (decl) == FUNCTION_DECL);
1572 /* This function should only be called at the end of the translation
1573 unit. We cannot be sure of whether or not something will be
1574 COMDAT until that point. */
1575 gcc_assert (at_eof);
1577 /* All entities with external linkage that are not COMDAT should be
1578 emitted; they may be referred to from other object files. */
1579 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1581 /* If this entity was used, let the back end see it; it will decide
1582 whether or not to emit it into the object file. */
1583 if (TREE_USED (decl)
1584 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1585 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1587 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1588 reference to DECL might cause it to be emitted later. */
1592 /* If necessary, write out the vtables for the dynamic class CTYPE.
1593 Returns true if any vtables were emitted. */
1596 maybe_emit_vtables (tree ctype)
1602 /* If the vtables for this class have already been emitted there is
1603 nothing more to do. */
1604 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1605 if (var_finalized_p (primary_vtbl))
1607 /* Ignore dummy vtables made by get_vtable_decl. */
1608 if (TREE_TYPE (primary_vtbl) == void_type_node)
1611 /* On some targets, we cannot determine the key method until the end
1612 of the translation unit -- which is when this function is
1614 if (!targetm.cxx.key_method_may_be_inline ())
1615 determine_key_method (ctype);
1617 /* See if any of the vtables are needed. */
1618 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1620 import_export_decl (vtbl);
1621 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1626 /* If the references to this class' vtables are optimized away,
1627 still emit the appropriate debugging information. See
1629 if (DECL_COMDAT (primary_vtbl)
1630 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1631 note_debug_info_needed (ctype);
1635 /* The ABI requires that we emit all of the vtables if we emit any
1637 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1639 /* Mark entities references from the virtual table as used. */
1640 mark_vtable_entries (vtbl);
1642 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1644 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1646 /* It had better be all done at compile-time. */
1651 DECL_EXTERNAL (vtbl) = 0;
1652 rest_of_decl_compilation (vtbl, 1, 1);
1654 /* Because we're only doing syntax-checking, we'll never end up
1655 actually marking the variable as written. */
1656 if (flag_syntax_only)
1657 TREE_ASM_WRITTEN (vtbl) = 1;
1660 /* Since we're writing out the vtable here, also write the debug
1662 note_debug_info_needed (ctype);
1667 /* A special return value from type_visibility meaning internal
1670 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1672 /* walk_tree helper function for type_visibility. */
1675 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1677 int *vis_p = (int *)data;
1682 else if (CLASS_TYPE_P (*tp))
1684 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1686 *vis_p = VISIBILITY_ANON;
1689 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1690 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1695 /* Returns the visibility of TYPE, which is the minimum visibility of its
1699 type_visibility (tree type)
1701 int vis = VISIBILITY_DEFAULT;
1702 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1706 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1707 specified (or if VISIBILITY is static). */
1710 constrain_visibility (tree decl, int visibility)
1712 if (visibility == VISIBILITY_ANON)
1714 /* extern "C" declarations aren't affected by the anonymous
1716 if (!DECL_EXTERN_C_P (decl))
1718 TREE_PUBLIC (decl) = 0;
1719 DECL_ONE_ONLY (decl) = 0;
1720 DECL_INTERFACE_KNOWN (decl) = 1;
1721 if (DECL_LANG_SPECIFIC (decl))
1722 DECL_NOT_REALLY_EXTERN (decl) = 1;
1725 else if (visibility > DECL_VISIBILITY (decl)
1726 && !DECL_VISIBILITY_SPECIFIED (decl))
1728 DECL_VISIBILITY (decl) = visibility;
1734 /* Constrain the visibility of DECL based on the visibility of its template
1738 constrain_visibility_for_template (tree decl, tree targs)
1740 /* If this is a template instantiation, check the innermost
1741 template args for visibility constraints. The outer template
1742 args are covered by the class check. */
1743 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1745 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1749 tree arg = TREE_VEC_ELT (args, i-1);
1751 vis = type_visibility (arg);
1752 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1755 if (TREE_CODE (arg) == ADDR_EXPR)
1756 arg = TREE_OPERAND (arg, 0);
1757 if (TREE_CODE (arg) == VAR_DECL
1758 || TREE_CODE (arg) == FUNCTION_DECL)
1760 if (! TREE_PUBLIC (arg))
1761 vis = VISIBILITY_ANON;
1763 vis = DECL_VISIBILITY (arg);
1767 constrain_visibility (decl, vis);
1771 /* Like c_determine_visibility, but with additional C++-specific
1774 Function-scope entities can rely on the function's visibility because
1775 it is set in start_preparsed_function.
1777 Class-scope entities cannot rely on the class's visibility until the end
1778 of the enclosing class definition.
1780 Note that because namespaces have multiple independent definitions,
1781 namespace visibility is handled elsewhere using the #pragma visibility
1782 machinery rather than by decorating the namespace declaration.
1784 The goal is for constraints from the type to give a diagnostic, and
1785 other constraints to be applied silently. */
1788 determine_visibility (tree decl)
1790 tree class_type = NULL_TREE;
1793 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1795 /* Only relevant for names with external linkage. */
1796 if (!TREE_PUBLIC (decl))
1799 /* Cloned constructors and destructors get the same visibility as
1800 the underlying function. That should be set up in
1801 maybe_clone_body. */
1802 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1804 if (TREE_CODE (decl) == TYPE_DECL)
1806 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1807 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1808 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1813 else if (DECL_LANG_SPECIFIC (decl))
1814 use_template = DECL_USE_TEMPLATE (decl);
1818 /* If DECL is a member of a class, visibility specifiers on the
1819 class can influence the visibility of the DECL. */
1820 if (DECL_CLASS_SCOPE_P (decl))
1821 class_type = DECL_CONTEXT (decl);
1824 /* Not a class member. */
1826 /* Virtual tables have DECL_CONTEXT set to their associated class,
1827 so they are automatically handled above. */
1828 gcc_assert (TREE_CODE (decl) != VAR_DECL
1829 || !DECL_VTABLE_OR_VTT_P (decl));
1831 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1833 /* Local statics and classes get the visibility of their
1834 containing function by default, except that
1835 -fvisibility-inlines-hidden doesn't affect them. */
1836 tree fn = DECL_CONTEXT (decl);
1837 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1839 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1840 DECL_VISIBILITY_SPECIFIED (decl) =
1841 DECL_VISIBILITY_SPECIFIED (fn);
1844 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1846 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1847 but have no TEMPLATE_INFO, so don't try to check it. */
1850 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1851 && flag_visibility_ms_compat)
1853 /* Under -fvisibility-ms-compat, types are visible by default,
1854 even though their contents aren't. */
1855 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1856 int underlying_vis = type_visibility (underlying_type);
1857 if (underlying_vis == VISIBILITY_ANON
1858 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1859 constrain_visibility (decl, underlying_vis);
1861 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1863 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1865 /* tinfo visibility is based on the type it's for. */
1866 constrain_visibility
1867 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1869 else if (use_template)
1870 /* Template instantiations and specializations get visibility based
1871 on their template unless they override it with an attribute. */;
1872 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1874 /* Set default visibility to whatever the user supplied with
1875 #pragma GCC visibility or a namespace visibility attribute. */
1876 DECL_VISIBILITY (decl) = default_visibility;
1877 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1883 /* If the specialization doesn't specify visibility, use the
1884 visibility from the template. */
1885 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1886 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1887 : DECL_TEMPLATE_INFO (decl));
1888 tree args = TI_ARGS (tinfo);
1890 if (args != error_mark_node)
1892 int depth = TMPL_ARGS_DEPTH (args);
1893 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1895 if (!DECL_VISIBILITY_SPECIFIED (decl))
1897 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1898 DECL_VISIBILITY_SPECIFIED (decl)
1899 = DECL_VISIBILITY_SPECIFIED (pattern);
1902 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1903 if (args && depth > template_class_depth (class_type))
1904 /* Limit visibility based on its template arguments. */
1905 constrain_visibility_for_template (decl, args);
1910 determine_visibility_from_class (decl, class_type);
1912 if (decl_anon_ns_mem_p (decl))
1913 /* Names in an anonymous namespace get internal linkage.
1914 This might change once we implement export. */
1915 constrain_visibility (decl, VISIBILITY_ANON);
1916 else if (TREE_CODE (decl) != TYPE_DECL)
1918 /* Propagate anonymity from type to decl. */
1919 int tvis = type_visibility (TREE_TYPE (decl));
1920 if (tvis == VISIBILITY_ANON
1921 || ! DECL_VISIBILITY_SPECIFIED (decl))
1922 constrain_visibility (decl, tvis);
1926 /* By default, static data members and function members receive
1927 the visibility of their containing class. */
1930 determine_visibility_from_class (tree decl, tree class_type)
1932 if (DECL_VISIBILITY_SPECIFIED (decl))
1935 if (visibility_options.inlines_hidden
1936 /* Don't do this for inline templates; specializations might not be
1937 inline, and we don't want them to inherit the hidden
1938 visibility. We'll set it here for all inline instantiations. */
1939 && !processing_template_decl
1940 && TREE_CODE (decl) == FUNCTION_DECL
1941 && DECL_DECLARED_INLINE_P (decl)
1942 && (! DECL_LANG_SPECIFIC (decl)
1943 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1944 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1947 /* Default to the class visibility. */
1948 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1949 DECL_VISIBILITY_SPECIFIED (decl)
1950 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1953 /* Give the target a chance to override the visibility associated
1955 if (TREE_CODE (decl) == VAR_DECL
1956 && (DECL_TINFO_P (decl)
1957 || (DECL_VTABLE_OR_VTT_P (decl)
1958 /* Construction virtual tables are not exported because
1959 they cannot be referred to from other object files;
1960 their name is not standardized by the ABI. */
1961 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1962 && TREE_PUBLIC (decl)
1963 && !DECL_REALLY_EXTERN (decl)
1964 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1965 targetm.cxx.determine_class_data_visibility (decl);
1968 /* Constrain the visibility of a class TYPE based on the visibility of its
1969 field types. Warn if any fields require lesser visibility. */
1972 constrain_class_visibility (tree type)
1978 int vis = type_visibility (type);
1980 if (vis == VISIBILITY_ANON
1981 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1984 /* Don't warn about visibility if the class has explicit visibility. */
1985 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1986 vis = VISIBILITY_INTERNAL;
1988 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1989 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1991 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
1992 int subvis = type_visibility (ftype);
1994 if (subvis == VISIBILITY_ANON)
1996 if (!in_main_input_context ())
1998 %qT has a field %qD whose type uses the anonymous namespace",
2001 else if (IS_AGGR_TYPE (ftype)
2002 && vis < VISIBILITY_HIDDEN
2003 && subvis >= VISIBILITY_HIDDEN)
2004 warning (OPT_Wattributes, "\
2005 %qT declared with greater visibility than the type of its field %qD",
2009 binfo = TYPE_BINFO (type);
2010 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2012 int subvis = type_visibility (TREE_TYPE (t));
2014 if (subvis == VISIBILITY_ANON)
2016 if (!in_main_input_context())
2018 %qT has a base %qT whose type uses the anonymous namespace",
2019 type, TREE_TYPE (t));
2021 else if (vis < VISIBILITY_HIDDEN
2022 && subvis >= VISIBILITY_HIDDEN)
2023 warning (OPT_Wattributes, "\
2024 %qT declared with greater visibility than its base %qT",
2025 type, TREE_TYPE (t));
2029 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2030 for DECL has not already been determined, do so now by setting
2031 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2032 function is called entities with vague linkage whose definitions
2033 are available must have TREE_PUBLIC set.
2035 If this function decides to place DECL in COMDAT, it will set
2036 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2037 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2038 callers defer that decision until it is clear that DECL is actually
2042 import_export_decl (tree decl)
2047 tree class_type = NULL_TREE;
2049 if (DECL_INTERFACE_KNOWN (decl))
2052 /* We cannot determine what linkage to give to an entity with vague
2053 linkage until the end of the file. For example, a virtual table
2054 for a class will be defined if and only if the key method is
2055 defined in this translation unit. As a further example, consider
2056 that when compiling a translation unit that uses PCH file with
2057 "-frepo" it would be incorrect to make decisions about what
2058 entities to emit when building the PCH; those decisions must be
2059 delayed until the repository information has been processed. */
2060 gcc_assert (at_eof);
2061 /* Object file linkage for explicit instantiations is handled in
2062 mark_decl_instantiated. For static variables in functions with
2063 vague linkage, maybe_commonize_var is used.
2065 Therefore, the only declarations that should be provided to this
2066 function are those with external linkage that are:
2068 * implicit instantiations of function templates
2072 * implicit instantiations of static data members of class
2079 Furthermore, all entities that reach this point must have a
2080 definition available in this translation unit.
2082 The following assertions check these conditions. */
2083 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2084 || TREE_CODE (decl) == VAR_DECL);
2085 /* Any code that creates entities with TREE_PUBLIC cleared should
2086 also set DECL_INTERFACE_KNOWN. */
2087 gcc_assert (TREE_PUBLIC (decl));
2088 if (TREE_CODE (decl) == FUNCTION_DECL)
2089 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2090 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2091 || DECL_DECLARED_INLINE_P (decl));
2093 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2094 || DECL_VTABLE_OR_VTT_P (decl)
2095 || DECL_TINFO_P (decl));
2096 /* Check that a definition of DECL is available in this translation
2098 gcc_assert (!DECL_REALLY_EXTERN (decl));
2100 /* Assume that DECL will not have COMDAT linkage. */
2102 /* Assume that DECL will not be imported into this translation
2106 /* See if the repository tells us whether or not to emit DECL in
2107 this translation unit. */
2108 emit_p = repo_emit_p (decl);
2111 else if (emit_p == 1)
2113 /* The repository indicates that this entity should be defined
2114 here. Make sure the back end honors that request. */
2115 if (TREE_CODE (decl) == VAR_DECL)
2117 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2118 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2121 FOR_EACH_CLONE (clone, decl)
2122 mark_needed (clone);
2126 /* Output the definition as an ordinary strong definition. */
2127 DECL_EXTERNAL (decl) = 0;
2128 DECL_INTERFACE_KNOWN (decl) = 1;
2133 /* We have already decided what to do with this DECL; there is no
2134 need to check anything further. */
2136 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2138 class_type = DECL_CONTEXT (decl);
2139 import_export_class (class_type);
2140 if (TYPE_FOR_JAVA (class_type))
2142 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2143 && CLASSTYPE_INTERFACE_ONLY (class_type))
2145 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2146 && !CLASSTYPE_USE_TEMPLATE (class_type)
2147 && CLASSTYPE_KEY_METHOD (class_type)
2148 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2149 /* The ABI requires that all virtual tables be emitted with
2150 COMDAT linkage. However, on systems where COMDAT symbols
2151 don't show up in the table of contents for a static
2152 archive, or on systems without weak symbols (where we
2153 approximate COMDAT linkage by using internal linkage), the
2154 linker will report errors about undefined symbols because
2155 it will not see the virtual table definition. Therefore,
2156 in the case that we know that the virtual table will be
2157 emitted in only one translation unit, we make the virtual
2158 table an ordinary definition with external linkage. */
2159 DECL_EXTERNAL (decl) = 0;
2160 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2162 /* CLASS_TYPE is being exported from this translation unit,
2163 so DECL should be defined here. */
2164 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2165 /* If a class is declared in a header with the "extern
2166 template" extension, then it will not be instantiated,
2167 even in translation units that would normally require
2168 it. Often such classes are explicitly instantiated in
2169 one translation unit. Therefore, the explicit
2170 instantiation must be made visible to other translation
2172 DECL_EXTERNAL (decl) = 0;
2175 /* The generic C++ ABI says that class data is always
2176 COMDAT, even if there is a key function. Some
2177 variants (e.g., the ARM EABI) says that class data
2178 only has COMDAT linkage if the class data might be
2179 emitted in more than one translation unit. When the
2180 key method can be inline and is inline, we still have
2181 to arrange for comdat even though
2182 class_data_always_comdat is false. */
2183 if (!CLASSTYPE_KEY_METHOD (class_type)
2184 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2185 || targetm.cxx.class_data_always_comdat ())
2187 /* The ABI requires COMDAT linkage. Normally, we
2188 only emit COMDAT things when they are needed;
2189 make sure that we realize that this entity is
2196 else if (!flag_implicit_templates
2197 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2202 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2204 tree type = TREE_TYPE (DECL_NAME (decl));
2205 if (CLASS_TYPE_P (type))
2208 import_export_class (type);
2209 if (CLASSTYPE_INTERFACE_KNOWN (type)
2210 && TYPE_POLYMORPHIC_P (type)
2211 && CLASSTYPE_INTERFACE_ONLY (type)
2212 /* If -fno-rtti was specified, then we cannot be sure
2213 that RTTI information will be emitted with the
2214 virtual table of the class, so we must emit it
2215 wherever it is used. */
2220 if (CLASSTYPE_INTERFACE_KNOWN (type)
2221 && !CLASSTYPE_INTERFACE_ONLY (type))
2223 comdat_p = (targetm.cxx.class_data_always_comdat ()
2224 || (CLASSTYPE_KEY_METHOD (type)
2225 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2230 DECL_EXTERNAL (decl) = 0;
2240 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2241 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2243 /* DECL is an implicit instantiation of a function or static
2245 if ((flag_implicit_templates
2246 && !flag_use_repository)
2247 || (flag_implicit_inline_templates
2248 && TREE_CODE (decl) == FUNCTION_DECL
2249 && DECL_DECLARED_INLINE_P (decl)))
2252 /* If we are not implicitly generating templates, then mark
2253 this entity as undefined in this translation unit. */
2256 else if (DECL_FUNCTION_MEMBER_P (decl))
2258 if (!DECL_DECLARED_INLINE_P (decl))
2260 tree ctype = DECL_CONTEXT (decl);
2261 import_export_class (ctype);
2262 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2264 DECL_NOT_REALLY_EXTERN (decl)
2265 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2266 || (DECL_DECLARED_INLINE_P (decl)
2267 && ! flag_implement_inlines
2268 && !DECL_VINDEX (decl)));
2270 if (!DECL_NOT_REALLY_EXTERN (decl))
2271 DECL_EXTERNAL (decl) = 1;
2273 /* Always make artificials weak. */
2274 if (DECL_ARTIFICIAL (decl) && flag_weak)
2277 maybe_make_one_only (decl);
2288 /* If we are importing DECL into this translation unit, mark is
2289 an undefined here. */
2290 DECL_EXTERNAL (decl) = 1;
2291 DECL_NOT_REALLY_EXTERN (decl) = 0;
2295 /* If we decided to put DECL in COMDAT, mark it accordingly at
2297 comdat_linkage (decl);
2300 DECL_INTERFACE_KNOWN (decl) = 1;
2303 /* Return an expression that performs the destruction of DECL, which
2304 must be a VAR_DECL whose type has a non-trivial destructor, or is
2305 an array whose (innermost) elements have a non-trivial destructor. */
2308 build_cleanup (tree decl)
2311 tree type = TREE_TYPE (decl);
2313 /* This function should only be called for declarations that really
2314 require cleanups. */
2315 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2317 /* Treat all objects with destructors as used; the destructor may do
2318 something substantive. */
2321 if (TREE_CODE (type) == ARRAY_TYPE)
2324 temp = build_address (decl);
2325 temp = build_delete (TREE_TYPE (temp), temp,
2326 sfk_complete_destructor,
2327 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2331 /* Returns the initialization guard variable for the variable DECL,
2332 which has static storage duration. */
2335 get_guard (tree decl)
2340 sname = mangle_guard_variable (decl);
2341 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2346 /* We use a type that is big enough to contain a mutex as well
2347 as an integer counter. */
2348 guard_type = targetm.cxx.guard_type ();
2349 guard = build_decl (VAR_DECL, sname, guard_type);
2351 /* The guard should have the same linkage as what it guards. */
2352 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2353 TREE_STATIC (guard) = TREE_STATIC (decl);
2354 DECL_COMMON (guard) = DECL_COMMON (decl);
2355 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2356 if (TREE_PUBLIC (decl))
2357 DECL_WEAK (guard) = DECL_WEAK (decl);
2358 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2359 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2361 DECL_ARTIFICIAL (guard) = 1;
2362 DECL_IGNORED_P (guard) = 1;
2363 TREE_USED (guard) = 1;
2364 pushdecl_top_level_and_finish (guard, NULL_TREE);
2369 /* Return those bits of the GUARD variable that should be set when the
2370 guarded entity is actually initialized. */
2373 get_guard_bits (tree guard)
2375 if (!targetm.cxx.guard_mask_bit ())
2377 /* We only set the first byte of the guard, in order to leave room
2378 for a mutex in the high-order bits. */
2379 guard = build1 (ADDR_EXPR,
2380 build_pointer_type (TREE_TYPE (guard)),
2382 guard = build1 (NOP_EXPR,
2383 build_pointer_type (char_type_node),
2385 guard = build1 (INDIRECT_REF, char_type_node, guard);
2391 /* Return an expression which determines whether or not the GUARD
2392 variable has already been initialized. */
2395 get_guard_cond (tree guard)
2399 /* Check to see if the GUARD is zero. */
2400 guard = get_guard_bits (guard);
2402 /* Mask off all but the low bit. */
2403 if (targetm.cxx.guard_mask_bit ())
2405 guard_value = integer_one_node;
2406 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2407 guard_value = convert (TREE_TYPE (guard), guard_value);
2408 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2411 guard_value = integer_zero_node;
2412 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2413 guard_value = convert (TREE_TYPE (guard), guard_value);
2414 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2417 /* Return an expression which sets the GUARD variable, indicating that
2418 the variable being guarded has been initialized. */
2421 set_guard (tree guard)
2425 /* Set the GUARD to one. */
2426 guard = get_guard_bits (guard);
2427 guard_init = integer_one_node;
2428 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2429 guard_init = convert (TREE_TYPE (guard), guard_init);
2430 return build_modify_expr (guard, NOP_EXPR, guard_init);
2433 /* Start the process of running a particular set of global constructors
2434 or destructors. Subroutine of do_[cd]tors. */
2437 start_objects (int method_type, int initp)
2443 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2445 if (initp != DEFAULT_INIT_PRIORITY)
2455 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2458 sprintf (type, "%c", method_type);
2460 fndecl = build_lang_decl (FUNCTION_DECL,
2461 get_file_function_name (type),
2462 build_function_type (void_type_node,
2464 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2466 TREE_PUBLIC (current_function_decl) = 0;
2468 /* Mark as artificial because it's not explicitly in the user's
2470 DECL_ARTIFICIAL (current_function_decl) = 1;
2472 /* Mark this declaration as used to avoid spurious warnings. */
2473 TREE_USED (current_function_decl) = 1;
2475 /* Mark this function as a global constructor or destructor. */
2476 if (method_type == 'I')
2477 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2479 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2480 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2482 body = begin_compound_stmt (BCS_FN_BODY);
2487 /* Finish the process of running a particular set of global constructors
2488 or destructors. Subroutine of do_[cd]tors. */
2491 finish_objects (int method_type, int initp, tree body)
2496 finish_compound_stmt (body);
2497 fn = finish_function (0);
2499 if (method_type == 'I')
2501 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2502 decl_init_priority_insert (fn, initp);
2506 DECL_STATIC_DESTRUCTOR (fn) = 1;
2507 decl_fini_priority_insert (fn, initp);
2510 expand_or_defer_fn (fn);
2513 /* The names of the parameters to the function created to handle
2514 initializations and destructions for objects with static storage
2516 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2517 #define PRIORITY_IDENTIFIER "__priority"
2519 /* The name of the function we create to handle initializations and
2520 destructions for objects with static storage duration. */
2521 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2523 /* The declaration for the __INITIALIZE_P argument. */
2524 static GTY(()) tree initialize_p_decl;
2526 /* The declaration for the __PRIORITY argument. */
2527 static GTY(()) tree priority_decl;
2529 /* The declaration for the static storage duration function. */
2530 static GTY(()) tree ssdf_decl;
2532 /* All the static storage duration functions created in this
2533 translation unit. */
2534 static GTY(()) VEC(tree,gc) *ssdf_decls;
2536 /* A map from priority levels to information about that priority
2537 level. There may be many such levels, so efficient lookup is
2539 static splay_tree priority_info_map;
2541 /* Begins the generation of the function that will handle all
2542 initialization and destruction of objects with static storage
2543 duration. The function generated takes two parameters of type
2544 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2545 nonzero, it performs initializations. Otherwise, it performs
2546 destructions. It only performs those initializations or
2547 destructions with the indicated __PRIORITY. The generated function
2550 It is assumed that this function will only be called once per
2551 translation unit. */
2554 start_static_storage_duration_function (unsigned count)
2559 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2561 /* Create the identifier for this function. It will be of the form
2562 SSDF_IDENTIFIER_<number>. */
2563 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2565 /* Create the parameters. */
2566 parm_types = void_list_node;
2567 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2568 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2569 type = build_function_type (void_type_node, parm_types);
2571 /* Create the FUNCTION_DECL itself. */
2572 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2573 get_identifier (id),
2575 TREE_PUBLIC (ssdf_decl) = 0;
2576 DECL_ARTIFICIAL (ssdf_decl) = 1;
2577 DECL_INLINE (ssdf_decl) = 1;
2579 /* Put this function in the list of functions to be called from the
2580 static constructors and destructors. */
2583 ssdf_decls = VEC_alloc (tree, gc, 32);
2585 /* Take this opportunity to initialize the map from priority
2586 numbers to information about that priority level. */
2587 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2588 /*delete_key_fn=*/0,
2589 /*delete_value_fn=*/
2590 (splay_tree_delete_value_fn) &free);
2592 /* We always need to generate functions for the
2593 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2594 priorities later, we'll be sure to find the
2595 DEFAULT_INIT_PRIORITY. */
2596 get_priority_info (DEFAULT_INIT_PRIORITY);
2599 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2601 /* Create the argument list. */
2602 initialize_p_decl = cp_build_parm_decl
2603 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2604 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2605 TREE_USED (initialize_p_decl) = 1;
2606 priority_decl = cp_build_parm_decl
2607 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2608 DECL_CONTEXT (priority_decl) = ssdf_decl;
2609 TREE_USED (priority_decl) = 1;
2611 TREE_CHAIN (initialize_p_decl) = priority_decl;
2612 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2614 /* Put the function in the global scope. */
2615 pushdecl (ssdf_decl);
2617 /* Start the function itself. This is equivalent to declaring the
2620 static void __ssdf (int __initialize_p, init __priority_p);
2622 It is static because we only need to call this function from the
2623 various constructor and destructor functions for this module. */
2624 start_preparsed_function (ssdf_decl,
2625 /*attrs=*/NULL_TREE,
2628 /* Set up the scope of the outermost block in the function. */
2629 body = begin_compound_stmt (BCS_FN_BODY);
2634 /* Finish the generation of the function which performs initialization
2635 and destruction of objects with static storage duration. After
2636 this point, no more such objects can be created. */
2639 finish_static_storage_duration_function (tree body)
2641 /* Close out the function. */
2642 finish_compound_stmt (body);
2643 expand_or_defer_fn (finish_function (0));
2646 /* Return the information about the indicated PRIORITY level. If no
2647 code to handle this level has yet been generated, generate the
2648 appropriate prologue. */
2650 static priority_info
2651 get_priority_info (int priority)
2656 n = splay_tree_lookup (priority_info_map,
2657 (splay_tree_key) priority);
2660 /* Create a new priority information structure, and insert it
2662 pi = XNEW (struct priority_info_s);
2663 pi->initializations_p = 0;
2664 pi->destructions_p = 0;
2665 splay_tree_insert (priority_info_map,
2666 (splay_tree_key) priority,
2667 (splay_tree_value) pi);
2670 pi = (priority_info) n->value;
2675 /* The effective initialization priority of a DECL. */
2677 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2678 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2679 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2681 /* Whether a DECL needs a guard to protect it against multiple
2684 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2685 || DECL_ONE_ONLY (decl) \
2686 || DECL_WEAK (decl)))
2688 /* Set up to handle the initialization or destruction of DECL. If
2689 INITP is nonzero, we are initializing the variable. Otherwise, we
2690 are destroying it. */
2693 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2695 tree guard_if_stmt = NULL_TREE;
2698 /* If we are supposed to destruct and there's a trivial destructor,
2699 nothing has to be done. */
2701 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2704 /* Trick the compiler into thinking we are at the file and line
2705 where DECL was declared so that error-messages make sense, and so
2706 that the debugger will show somewhat sensible file and line
2708 input_location = DECL_SOURCE_LOCATION (decl);
2714 Access control for implicit calls to the constructors,
2715 the conversion functions, or the destructor called to
2716 create and destroy a static data member is performed as
2717 if these calls appeared in the scope of the member's
2720 we pretend we are in a static member function of the class of
2721 which the DECL is a member. */
2722 if (member_p (decl))
2724 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2725 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2728 /* Assume we don't need a guard. */
2730 /* We need a guard if this is an object with external linkage that
2731 might be initialized in more than one place. (For example, a
2732 static data member of a template, when the data member requires
2734 if (NEEDS_GUARD_P (decl))
2738 guard = get_guard (decl);
2740 /* When using __cxa_atexit, we just check the GUARD as we would
2741 for a local static. */
2742 if (flag_use_cxa_atexit)
2744 /* When using __cxa_atexit, we never try to destroy
2745 anything from a static destructor. */
2747 guard_cond = get_guard_cond (guard);
2749 /* If we don't have __cxa_atexit, then we will be running
2750 destructors from .fini sections, or their equivalents. So,
2751 we need to know how many times we've tried to initialize this
2752 object. We do initializations only if the GUARD is zero,
2753 i.e., if we are the first to initialize the variable. We do
2754 destructions only if the GUARD is one, i.e., if we are the
2755 last to destroy the variable. */
2758 = cp_build_binary_op (EQ_EXPR,
2759 build_unary_op (PREINCREMENT_EXPR,
2765 = cp_build_binary_op (EQ_EXPR,
2766 build_unary_op (PREDECREMENT_EXPR,
2771 guard_if_stmt = begin_if_stmt ();
2772 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2776 /* If we're using __cxa_atexit, we have not already set the GUARD,
2777 so we must do so now. */
2778 if (guard && initp && flag_use_cxa_atexit)
2779 finish_expr_stmt (set_guard (guard));
2781 /* Perform the initialization or destruction. */
2785 finish_expr_stmt (init);
2787 /* If we're using __cxa_atexit, register a function that calls the
2788 destructor for the object. */
2789 if (flag_use_cxa_atexit)
2790 finish_expr_stmt (register_dtor_fn (decl));
2793 finish_expr_stmt (build_cleanup (decl));
2795 /* Finish the guard if-stmt, if necessary. */
2798 finish_then_clause (guard_if_stmt);
2799 finish_if_stmt (guard_if_stmt);
2802 /* Now that we're done with DECL we don't need to pretend to be a
2803 member of its class any longer. */
2804 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2805 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2808 /* Generate code to do the initialization or destruction of the decls in VARS,
2809 a TREE_LIST of VAR_DECL with static storage duration.
2810 Whether initialization or destruction is performed is specified by INITP. */
2813 do_static_initialization_or_destruction (tree vars, bool initp)
2815 tree node, init_if_stmt, cond;
2817 /* Build the outer if-stmt to check for initialization or destruction. */
2818 init_if_stmt = begin_if_stmt ();
2819 cond = initp ? integer_one_node : integer_zero_node;
2820 cond = cp_build_binary_op (EQ_EXPR,
2823 finish_if_stmt_cond (cond, init_if_stmt);
2827 tree decl = TREE_VALUE (node);
2828 tree priority_if_stmt;
2832 /* If we don't need a destructor, there's nothing to do. Avoid
2833 creating a possibly empty if-stmt. */
2834 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2836 node = TREE_CHAIN (node);
2840 /* Remember that we had an initialization or finalization at this
2842 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2843 pi = get_priority_info (priority);
2845 pi->initializations_p = 1;
2847 pi->destructions_p = 1;
2849 /* Conditionalize this initialization on being in the right priority
2850 and being initializing/finalizing appropriately. */
2851 priority_if_stmt = begin_if_stmt ();
2852 cond = cp_build_binary_op (EQ_EXPR,
2854 build_int_cst (NULL_TREE, priority));
2855 finish_if_stmt_cond (cond, priority_if_stmt);
2857 /* Process initializers with same priority. */
2859 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2860 node = TREE_CHAIN (node))
2861 /* Do one initialization or destruction. */
2862 one_static_initialization_or_destruction (TREE_VALUE (node),
2863 TREE_PURPOSE (node), initp);
2865 /* Finish up the priority if-stmt body. */
2866 finish_then_clause (priority_if_stmt);
2867 finish_if_stmt (priority_if_stmt);
2871 /* Finish up the init/destruct if-stmt body. */
2872 finish_then_clause (init_if_stmt);
2873 finish_if_stmt (init_if_stmt);
2876 /* VARS is a list of variables with static storage duration which may
2877 need initialization and/or finalization. Remove those variables
2878 that don't really need to be initialized or finalized, and return
2879 the resulting list. The order in which the variables appear in
2880 VARS is in reverse order of the order in which they should actually
2881 be initialized. The list we return is in the unreversed order;
2882 i.e., the first variable should be initialized first. */
2885 prune_vars_needing_no_initialization (tree *vars)
2888 tree result = NULL_TREE;
2893 tree decl = TREE_VALUE (t);
2894 tree init = TREE_PURPOSE (t);
2896 /* Deal gracefully with error. */
2897 if (decl == error_mark_node)
2899 var = &TREE_CHAIN (t);
2903 /* The only things that can be initialized are variables. */
2904 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2906 /* If this object is not defined, we don't need to do anything
2908 if (DECL_EXTERNAL (decl))
2910 var = &TREE_CHAIN (t);
2914 /* Also, if the initializer already contains errors, we can bail
2916 if (init && TREE_CODE (init) == TREE_LIST
2917 && value_member (error_mark_node, init))
2919 var = &TREE_CHAIN (t);
2923 /* This variable is going to need initialization and/or
2924 finalization, so we add it to the list. */
2925 *var = TREE_CHAIN (t);
2926 TREE_CHAIN (t) = result;
2933 /* Make sure we have told the back end about all the variables in
2937 write_out_vars (tree vars)
2941 for (v = vars; v; v = TREE_CHAIN (v))
2943 tree var = TREE_VALUE (v);
2944 if (!var_finalized_p (var))
2946 import_export_decl (var);
2947 rest_of_decl_compilation (var, 1, 1);
2952 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2953 (otherwise) that will initialize all global objects with static
2954 storage duration having the indicated PRIORITY. */
2957 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2966 input_location = *locus;
2967 #ifdef USE_MAPPED_LOCATION
2973 /* We use `I' to indicate initialization and `D' to indicate
2975 function_key = constructor_p ? 'I' : 'D';
2977 /* We emit the function lazily, to avoid generating empty
2978 global constructors and destructors. */
2981 /* For Objective-C++, we may need to initialize metadata found in this module.
2982 This must be done _before_ any other static initializations. */
2983 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2984 && constructor_p && objc_static_init_needed_p ())
2986 body = start_objects (function_key, priority);
2987 objc_generate_static_init_call (NULL_TREE);
2990 /* Call the static storage duration function with appropriate
2992 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2994 /* Calls to pure or const functions will expand to nothing. */
2995 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2998 body = start_objects (function_key, priority);
3000 arguments = tree_cons (NULL_TREE,
3001 build_int_cst (NULL_TREE, priority),
3003 arguments = tree_cons (NULL_TREE,
3004 build_int_cst (NULL_TREE, constructor_p),
3006 finish_expr_stmt (build_function_call (fndecl, arguments));
3010 /* Close out the function. */
3012 finish_objects (function_key, priority, body);
3015 /* Generate constructor and destructor functions for the priority
3019 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3021 location_t *locus = (location_t *) data;
3022 int priority = (int) n->key;
3023 priority_info pi = (priority_info) n->value;
3025 /* Generate the functions themselves, but only if they are really
3027 if (pi->initializations_p)
3028 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3029 if (pi->destructions_p)
3030 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3032 /* Keep iterating. */
3036 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3037 decls referenced from front-end specific constructs; it will be called
3038 only for language-specific tree nodes.
3040 Here we must deal with member pointers. */
3043 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3047 switch (TREE_CODE (t))
3050 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3051 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3054 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3055 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3058 if (DECL_VTABLE_OR_VTT_P (t))
3060 /* The ABI requires that all virtual tables be emitted
3061 whenever one of them is. */
3063 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3065 vtbl = TREE_CHAIN (vtbl))
3066 mark_decl_referenced (vtbl);
3068 else if (DECL_CONTEXT (t)
3069 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3070 /* If we need a static variable in a function, then we
3071 need the containing function. */
3072 mark_decl_referenced (DECL_CONTEXT (t));
3081 /* Java requires that we be able to reference a local address for a
3082 method, and not be confused by PLT entries. If hidden aliases are
3083 supported, emit one for each java function that we've emitted. */
3086 build_java_method_aliases (void)
3088 struct cgraph_node *node;
3090 #ifndef HAVE_GAS_HIDDEN
3094 for (node = cgraph_nodes; node ; node = node->next)
3096 tree fndecl = node->decl;
3098 if (TREE_ASM_WRITTEN (fndecl)
3099 && DECL_CONTEXT (fndecl)
3100 && TYPE_P (DECL_CONTEXT (fndecl))
3101 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3102 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3104 /* Mangle the name in a predictable way; we need to reference
3105 this from a java compiled object file. */
3106 tree oid, nid, alias;
3110 oid = DECL_ASSEMBLER_NAME (fndecl);
3111 oname = IDENTIFIER_POINTER (oid);
3112 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3113 nname = ACONCAT (("_ZGA", oname+2, NULL));
3114 nid = get_identifier (nname);
3116 alias = make_alias_for (fndecl, nid);
3117 TREE_PUBLIC (alias) = 1;
3118 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3120 assemble_alias (alias, oid);
3125 /* This routine is called at the end of compilation.
3126 Its job is to create all the code needed to initialize and
3127 destroy the global aggregates. We do the destruction
3128 first, since that way we only need to reverse the decls once. */
3131 cp_write_global_declarations (void)
3137 unsigned ssdf_count = 0;
3141 locus = input_location;
3144 /* Bad parse errors. Just forget about it. */
3145 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3149 c_common_write_pch ();
3151 #ifdef USE_MAPPED_LOCATION
3154 /* Otherwise, GDB can get confused, because in only knows
3155 about source for LINENO-1 lines. */
3159 /* We now have to write out all the stuff we put off writing out.
3162 o Template specializations that we have not yet instantiated,
3163 but which are needed.
3164 o Initialization and destruction for non-local objects with
3165 static storage duration. (Local objects with static storage
3166 duration are initialized when their scope is first entered,
3167 and are cleaned up via atexit.)
3168 o Virtual function tables.
3170 All of these may cause others to be needed. For example,
3171 instantiating one function may cause another to be needed, and
3172 generating the initializer for an object may cause templates to be
3173 instantiated, etc., etc. */
3175 timevar_push (TV_VARCONST);
3177 emit_support_tinfos ();
3186 /* If there are templates that we've put off instantiating, do
3188 instantiate_pending_templates (retries);
3191 /* Write out virtual tables as required. Note that writing out
3192 the virtual table for a template class may cause the
3193 instantiation of members of that class. If we write out
3194 vtables then we remove the class from our list so we don't
3195 have to look at it again. */
3197 while (keyed_classes != NULL_TREE
3198 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3201 keyed_classes = TREE_CHAIN (keyed_classes);
3207 tree next = TREE_CHAIN (t);
3211 if (maybe_emit_vtables (TREE_VALUE (next)))
3214 TREE_CHAIN (t) = TREE_CHAIN (next);
3219 next = TREE_CHAIN (t);
3223 /* Write out needed type info variables. We have to be careful
3224 looping through unemitted decls, because emit_tinfo_decl may
3225 cause other variables to be needed. New elements will be
3226 appended, and we remove from the vector those that actually
3228 for (i = VEC_length (tree, unemitted_tinfo_decls);
3229 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3230 if (emit_tinfo_decl (t))
3233 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3236 /* The list of objects with static storage duration is built up
3237 in reverse order. We clear STATIC_AGGREGATES so that any new
3238 aggregates added during the initialization of these will be
3239 initialized in the correct order when we next come around the
3241 vars = prune_vars_needing_no_initialization (&static_aggregates);
3245 /* We need to start a new initialization function each time
3246 through the loop. That's because we need to know which
3247 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3248 isn't computed until a function is finished, and written
3249 out. That's a deficiency in the back end. When this is
3250 fixed, these initialization functions could all become
3251 inline, with resulting performance improvements. */
3254 /* Set the line and file, so that it is obviously not from
3256 input_location = locus;
3257 ssdf_body = start_static_storage_duration_function (ssdf_count);
3259 /* Make sure the back end knows about all the variables. */
3260 write_out_vars (vars);
3262 /* First generate code to do all the initializations. */
3264 do_static_initialization_or_destruction (vars, /*initp=*/true);
3266 /* Then, generate code to do all the destructions. Do these
3267 in reverse order so that the most recently constructed
3268 variable is the first destroyed. If we're using
3269 __cxa_atexit, then we don't need to do this; functions
3270 were registered at initialization time to destroy the
3272 if (!flag_use_cxa_atexit && vars)
3274 vars = nreverse (vars);
3275 do_static_initialization_or_destruction (vars, /*initp=*/false);
3280 /* Finish up the static storage duration function for this
3282 input_location = locus;
3283 finish_static_storage_duration_function (ssdf_body);
3285 /* All those initializations and finalizations might cause
3286 us to need more inline functions, more template
3287 instantiations, etc. */
3290 #ifdef USE_MAPPED_LOCATION
3297 /* Go through the set of inline functions whose bodies have not
3298 been emitted yet. If out-of-line copies of these functions
3299 are required, emit them. */
3300 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3302 /* Does it need synthesizing? */
3303 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3304 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3306 /* Even though we're already at the top-level, we push
3307 there again. That way, when we pop back a few lines
3308 hence, all of our state is restored. Otherwise,
3309 finish_function doesn't clean things up, and we end
3310 up with CURRENT_FUNCTION_DECL set. */
3311 push_to_top_level ();
3312 /* The decl's location will mark where it was first
3313 needed. Save that so synthesize method can indicate
3314 where it was needed from, in case of error */
3315 input_location = DECL_SOURCE_LOCATION (decl);
3316 synthesize_method (decl);
3317 pop_from_top_level ();
3321 if (!DECL_SAVED_TREE (decl))
3324 /* We lie to the back end, pretending that some functions
3325 are not defined when they really are. This keeps these
3326 functions from being put out unnecessarily. But, we must
3327 stop lying when the functions are referenced, or if they
3328 are not comdat since they need to be put out now. If
3329 DECL_INTERFACE_KNOWN, then we have already set
3330 DECL_EXTERNAL appropriately, so there's no need to check
3331 again, and we do not want to clear DECL_EXTERNAL if a
3332 previous call to import_export_decl set it.
3334 This is done in a separate for cycle, because if some
3335 deferred function is contained in another deferred
3336 function later in deferred_fns varray,
3337 rest_of_compilation would skip this function and we
3338 really cannot expand the same function twice. */
3339 import_export_decl (decl);
3340 if (DECL_NOT_REALLY_EXTERN (decl)
3341 && DECL_INITIAL (decl)
3342 && decl_needed_p (decl))
3343 DECL_EXTERNAL (decl) = 0;
3345 /* If we're going to need to write this function out, and
3346 there's already a body for it, create RTL for it now.
3347 (There might be no body if this is a method we haven't
3348 gotten around to synthesizing yet.) */
3349 if (!DECL_EXTERNAL (decl)
3350 && decl_needed_p (decl)
3351 && !TREE_ASM_WRITTEN (decl)
3352 && !cgraph_node (decl)->local.finalized)
3354 /* We will output the function; no longer consider it in this
3356 DECL_DEFER_OUTPUT (decl) = 0;
3357 /* Generate RTL for this function now that we know we
3359 expand_or_defer_fn (decl);
3360 /* If we're compiling -fsyntax-only pretend that this
3361 function has been written out so that we don't try to
3363 if (flag_syntax_only)
3364 TREE_ASM_WRITTEN (decl) = 1;
3369 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3372 /* Static data members are just like namespace-scope globals. */
3373 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3375 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3377 import_export_decl (decl);
3378 /* If this static data member is needed, provide it to the
3380 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3381 DECL_EXTERNAL (decl) = 0;
3383 if (VEC_length (tree, pending_statics) != 0
3384 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3385 VEC_length (tree, pending_statics)))
3392 /* All used inline functions must have a definition at this point. */
3393 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3395 if (/* Check online inline functions that were actually used. */
3396 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3397 /* If the definition actually was available here, then the
3398 fact that the function was not defined merely represents
3399 that for some reason (use of a template repository,
3400 #pragma interface, etc.) we decided not to emit the
3402 && !DECL_INITIAL (decl)
3403 /* An explicit instantiation can be used to specify
3404 that the body is in another unit. It will have
3405 already verified there was a definition. */
3406 && !DECL_EXPLICIT_INSTANTIATION (decl))
3408 warning (0, "inline function %q+D used but never defined", decl);
3409 /* Avoid a duplicate warning from check_global_declaration_1. */
3410 TREE_NO_WARNING (decl) = 1;
3414 /* We give C linkage to static constructors and destructors. */
3415 push_lang_context (lang_name_c);
3417 /* Generate initialization and destruction functions for all
3418 priorities for which they are required. */
3419 if (priority_info_map)
3420 splay_tree_foreach (priority_info_map,
3421 generate_ctor_and_dtor_functions_for_priority,
3423 else if (c_dialect_objc () && objc_static_init_needed_p ())
3424 /* If this is obj-c++ and we need a static init, call
3425 generate_ctor_or_dtor_function. */
3426 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3427 DEFAULT_INIT_PRIORITY, &locus);
3429 /* We're done with the splay-tree now. */
3430 if (priority_info_map)
3431 splay_tree_delete (priority_info_map);
3433 /* Generate any missing aliases. */
3434 maybe_apply_pending_pragma_weaks ();
3436 /* We're done with static constructors, so we can go back to "C++"
3438 pop_lang_context ();
3440 cgraph_finalize_compilation_unit ();
3443 /* Now, issue warnings about static, but not defined, functions,
3444 etc., and emit debugging information. */
3445 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3446 if (VEC_length (tree, pending_statics) != 0)
3448 check_global_declarations (VEC_address (tree, pending_statics),
3449 VEC_length (tree, pending_statics));
3450 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3451 VEC_length (tree, pending_statics));
3454 /* Generate hidden aliases for Java. */
3455 build_java_method_aliases ();
3459 /* The entire file is now complete. If requested, dump everything
3463 FILE *stream = dump_begin (TDI_tu, &flags);
3467 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3468 dump_end (TDI_tu, stream);
3472 timevar_pop (TV_VARCONST);
3474 if (flag_detailed_statistics)
3476 dump_tree_statistics ();
3477 dump_time_statistics ();
3479 input_location = locus;
3481 #ifdef ENABLE_CHECKING
3482 validate_conversion_obstack ();
3483 #endif /* ENABLE_CHECKING */
3486 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3487 function to call in parse-tree form; it has not yet been
3488 semantically analyzed. ARGS are the arguments to the function.
3489 They have already been semantically analyzed. */
3492 build_offset_ref_call_from_tree (tree fn, tree args)
3501 object = TREE_OPERAND (fn, 0);
3503 if (processing_template_decl)
3505 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3506 || TREE_CODE (fn) == MEMBER_REF);
3507 if (type_dependent_expression_p (fn)
3508 || any_type_dependent_arguments_p (args))
3509 return build_nt_call_list (fn, args);
3511 /* Transform the arguments and add the implicit "this"
3512 parameter. That must be done before the FN is transformed
3513 because we depend on the form of FN. */
3514 args = build_non_dependent_args (args);
3515 object = build_non_dependent_expr (object);
3516 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3517 object = build_unary_op (ADDR_EXPR, object, 0);
3518 args = tree_cons (NULL_TREE, object, args);
3519 /* Now that the arguments are done, transform FN. */
3520 fn = build_non_dependent_expr (fn);
3523 /* A qualified name corresponding to a bound pointer-to-member is
3524 represented as an OFFSET_REF:
3526 struct B { void g(); };
3528 void B::g() { (this->*p)(); } */
3529 if (TREE_CODE (fn) == OFFSET_REF)
3531 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3532 fn = TREE_OPERAND (fn, 1);
3533 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3534 args = tree_cons (NULL_TREE, object_addr, args);
3537 expr = build_function_call (fn, args);
3538 if (processing_template_decl && expr != error_mark_node)
3539 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3545 check_default_args (tree x)
3547 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3548 bool saw_def = false;
3549 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3550 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3552 if (TREE_PURPOSE (arg))
3556 error ("default argument missing for parameter %P of %q+#D", i, x);
3557 TREE_PURPOSE (arg) = error_mark_node;
3562 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3563 If DECL is a specialization or implicitly declared class member,
3564 generate the actual definition. */
3567 mark_used (tree decl)
3569 HOST_WIDE_INT saved_processing_template_decl = 0;
3571 /* If DECL is a BASELINK for a single function, then treat it just
3572 like the DECL for the function. Otherwise, if the BASELINK is
3573 for an overloaded function, we don't know which function was
3574 actually used until after overload resolution. */
3575 if (TREE_CODE (decl) == BASELINK)
3577 decl = BASELINK_FUNCTIONS (decl);
3578 if (really_overloaded_fn (decl))
3580 decl = OVL_CURRENT (decl);
3583 TREE_USED (decl) = 1;
3584 if (DECL_CLONED_FUNCTION_P (decl))
3585 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3586 /* If we don't need a value, then we don't need to synthesize DECL. */
3587 if (skip_evaluation)
3589 /* Normally, we can wait until instantiation-time to synthesize
3590 DECL. However, if DECL is a static data member initialized with
3591 a constant, we need the value right now because a reference to
3592 such a data member is not value-dependent. */
3593 if (TREE_CODE (decl) == VAR_DECL
3594 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3595 && DECL_CLASS_SCOPE_P (decl))
3597 /* Don't try to instantiate members of dependent types. We
3598 cannot just use dependent_type_p here because this function
3599 may be called from fold_non_dependent_expr, and then we may
3600 see dependent types, even though processing_template_decl
3602 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3603 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3605 /* Pretend that we are not in a template, even if we are, so
3606 that the static data member initializer will be processed. */
3607 saved_processing_template_decl = processing_template_decl;
3608 processing_template_decl = 0;
3611 if (processing_template_decl)
3614 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3615 && !TREE_ASM_WRITTEN (decl))
3616 /* Remember it, so we can check it was defined. */
3618 if (DECL_DEFERRED_FN (decl))
3621 /* Remember the current location for a function we will end up
3622 synthesizing. Then we can inform the user where it was
3623 required in the case of error. */
3624 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3625 && !DECL_THUNK_P (decl))
3626 DECL_SOURCE_LOCATION (decl) = input_location;
3628 note_vague_linkage_fn (decl);
3631 assemble_external (decl);
3633 /* Is it a synthesized method that needs to be synthesized? */
3634 if (TREE_CODE (decl) == FUNCTION_DECL
3635 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3636 && DECL_ARTIFICIAL (decl)
3637 && !DECL_THUNK_P (decl)
3638 && ! DECL_INITIAL (decl)
3639 /* Kludge: don't synthesize for default args. Unfortunately this
3640 rules out initializers of namespace-scoped objects too, but
3641 it's sort-of ok if the implicit ctor or dtor decl keeps
3642 pointing to the class location. */
3643 && current_function_decl)
3645 synthesize_method (decl);
3646 /* If we've already synthesized the method we don't need to
3647 do the instantiation test below. */
3649 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3650 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3651 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3652 || (TREE_CODE (decl) == FUNCTION_DECL
3653 && DECL_INLINE (DECL_TEMPLATE_RESULT
3654 (template_for_substitution (decl))))
3655 /* We need to instantiate static data members so that there
3656 initializers are available in integral constant
3658 || (TREE_CODE (decl) == VAR_DECL
3659 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3660 /* If this is a function or variable that is an instance of some
3661 template, we now know that we will need to actually do the
3662 instantiation. We check that DECL is not an explicit
3663 instantiation because that is not checked in instantiate_decl.
3665 We put off instantiating functions in order to improve compile
3666 times. Maintaining a stack of active functions is expensive,
3667 and the inliner knows to instantiate any functions it might
3668 need. Therefore, we always try to defer instantiation. */
3669 instantiate_decl (decl, /*defer_ok=*/true,
3670 /*expl_inst_class_mem_p=*/false);
3672 processing_template_decl = saved_processing_template_decl;
3675 #include "gt-cp-decl2.h"