1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* Process declarations and symbol lookup for C++ front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
32 #include "coretypes.h"
47 #include "tree-mudflap.h"
49 #include "tree-inline.h"
51 #include "tree-dump.h"
54 extern cpp_reader *parse_in;
56 /* This structure contains information about the initializations
57 and/or destructions required for a particular priority level. */
58 typedef struct priority_info_s {
59 /* Nonzero if there have been any initializations at this priority
60 throughout the translation unit. */
61 int initializations_p;
62 /* Nonzero if there have been any destructions at this priority
63 throughout the translation unit. */
67 static void mark_vtable_entries (tree);
68 static bool maybe_emit_vtables (tree);
69 static bool acceptable_java_type (tree);
70 static tree start_objects (int, int);
71 static void finish_objects (int, int, tree);
72 static tree start_static_storage_duration_function (unsigned);
73 static void finish_static_storage_duration_function (tree);
74 static priority_info get_priority_info (int);
75 static void do_static_initialization_or_destruction (tree, bool);
76 static void one_static_initialization_or_destruction (tree, tree, bool);
77 static void generate_ctor_or_dtor_function (bool, int, location_t *);
78 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
80 static tree prune_vars_needing_no_initialization (tree *);
81 static void write_out_vars (tree);
82 static void import_export_class (tree);
83 static tree get_guard_bits (tree);
84 static void determine_visibility_from_class (tree, tree);
86 /* A list of static class variables. This is needed, because a
87 static class variable can be declared inside the class without
88 an initializer, and then initialized, statically, outside the class. */
89 static GTY(()) VEC(tree,gc) *pending_statics;
91 /* A list of functions which were declared inline, but which we
92 may need to emit outline anyway. */
93 static GTY(()) VEC(tree,gc) *deferred_fns;
95 /* Nonzero if we're done parsing and into end-of-file activities. */
101 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
102 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
103 that apply to the function). */
106 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
111 if (fntype == error_mark_node || ctype == error_mark_node)
112 return error_mark_node;
114 type_quals = quals & ~TYPE_QUAL_RESTRICT;
115 ctype = cp_build_qualified_type (ctype, type_quals);
116 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
117 (TREE_CODE (fntype) == METHOD_TYPE
118 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
119 : TYPE_ARG_TYPES (fntype)));
120 raises = TYPE_RAISES_EXCEPTIONS (fntype);
122 fntype = build_exception_variant (fntype, raises);
127 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
131 cp_build_parm_decl (tree name, tree type)
133 tree parm = build_decl (PARM_DECL, name, type);
134 /* DECL_ARG_TYPE is only used by the back end and the back end never
136 if (!processing_template_decl)
137 DECL_ARG_TYPE (parm) = type_passed_as (type);
139 /* If the type is a pack expansion, then we have a function
141 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
142 FUNCTION_PARAMETER_PACK_P (parm) = 1;
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name, tree type)
153 tree parm = cp_build_parm_decl (name, type);
154 DECL_ARTIFICIAL (parm) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn)
177 tree basetype, arg_types, parms, parm, fntype;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
194 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
195 basetype = TREE_TYPE (TREE_VALUE (arg_types));
196 arg_types = TREE_CHAIN (arg_types);
198 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm) = parms;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
213 DECL_HAS_VTT_PARM_P (fn) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
218 TREE_CHAIN (parm) = parms;
220 arg_types = hash_tree_chain (integer_type_node, arg_types);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
225 /* And rebuild the function type. */
226 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
229 fntype = build_exception_variant (fntype,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
231 TREE_TYPE (fn) = fntype;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype, tree function, enum overload_flags flags)
260 tree fn_name = DECL_NAME (function);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function, lang_cplusplus);
266 if (fn_name == NULL_TREE)
268 error ("name missing for member function");
269 fn_name = get_identifier ("<anonymous>");
270 DECL_NAME (function) = fn_name;
273 DECL_CONTEXT (function) = ctype;
275 if (flags == DTOR_FLAG)
276 DECL_DESTRUCTOR_P (function) = 1;
278 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
279 maybe_retrofit_in_chrg (function);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr, tree index_exp)
290 tree orig_array_expr = array_expr;
291 tree orig_index_exp = index_exp;
293 if (error_operand_p (array_expr) || error_operand_p (index_exp))
294 return error_mark_node;
296 if (processing_template_decl)
298 if (type_dependent_expression_p (array_expr)
299 || type_dependent_expression_p (index_exp))
300 return build_min_nt (ARRAY_REF, array_expr, index_exp,
301 NULL_TREE, NULL_TREE);
302 array_expr = build_non_dependent_expr (array_expr);
303 index_exp = build_non_dependent_expr (index_exp);
306 type = TREE_TYPE (array_expr);
308 type = non_reference (type);
310 /* If they have an `operator[]', use that. */
311 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type) == ARRAY_TYPE)
326 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
328 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
331 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
333 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
335 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
338 if ((p1 && i2) && (i1 && p2))
339 error ("ambiguous conversion for array subscript");
342 array_expr = p1, index_exp = i2;
344 array_expr = p2, index_exp = i1;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type, TREE_TYPE (index_exp));
349 return error_mark_node;
352 if (array_expr == error_mark_node || index_exp == error_mark_node)
353 error ("ambiguous conversion for array subscript");
355 expr = build_array_ref (array_expr, index_exp);
357 if (processing_template_decl && expr != error_mark_node)
358 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
359 NULL_TREE, NULL_TREE);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
375 if (exp == error_mark_node)
378 if (processing_template_decl)
380 t = build_min (DELETE_EXPR, void_type_node, exp, size);
381 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
382 DELETE_EXPR_USE_VEC (t) = doing_vec;
383 TREE_SIDE_EFFECTS (t) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
390 warning (0, "deleting array %q#D", exp);
392 t = build_expr_type_conversion (WANT_POINTER, exp, true);
394 if (t == NULL_TREE || t == error_mark_node)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node;
401 type = TREE_TYPE (t);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
416 warning (0, "deleting %qT is undefined", type);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t))
422 return build1 (NOP_EXPR, void_type_node, t);
425 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
426 sfk_deleting_destructor,
429 return build_delete (type, t, sfk_deleting_destructor,
430 LOOKUP_NORMAL, use_global_delete);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl)
441 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
442 decl = DECL_TEMPLATE_RESULT (tmpl);
444 if (TREE_CODE (decl) == FUNCTION_DECL
445 || (TREE_CODE (decl) == TYPE_DECL
446 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
448 /* The parser rejects template declarations in local classes. */
449 gcc_assert (!current_function_decl);
450 /* The parser rejects any use of virtual in a function template. */
451 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
452 && DECL_VIRTUAL_P (decl)));
454 /* The debug-information generating code doesn't know what to do
455 with member templates. */
456 DECL_IGNORED_P (tmpl) = 1;
459 error ("template declaration of %q#D", decl);
462 /* Return true iff TYPE is a valid Java parameter or return type. */
465 acceptable_java_type (tree type)
467 if (type == error_mark_node)
470 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
472 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
474 type = TREE_TYPE (type);
475 if (TREE_CODE (type) == RECORD_TYPE)
478 if (! TYPE_FOR_JAVA (type))
480 if (! CLASSTYPE_TEMPLATE_INFO (type))
482 args = CLASSTYPE_TI_ARGS (type);
483 i = TREE_VEC_LENGTH (args);
486 type = TREE_VEC_ELT (args, i);
487 if (TREE_CODE (type) == POINTER_TYPE)
488 type = TREE_TYPE (type);
489 if (! TYPE_FOR_JAVA (type))
498 /* For a METHOD in a Java class CTYPE, return true if
499 the parameter and return types are valid Java types.
500 Otherwise, print appropriate error messages, and return false. */
503 check_java_method (tree method)
506 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
507 tree ret_type = TREE_TYPE (TREE_TYPE (method));
509 if (!acceptable_java_type (ret_type))
511 error ("Java method %qD has non-Java return type %qT",
516 arg_types = TREE_CHAIN (arg_types);
517 if (DECL_HAS_IN_CHARGE_PARM_P (method))
518 arg_types = TREE_CHAIN (arg_types);
519 if (DECL_HAS_VTT_PARM_P (method))
520 arg_types = TREE_CHAIN (arg_types);
522 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
524 tree type = TREE_VALUE (arg_types);
525 if (!acceptable_java_type (type))
527 if (type != error_mark_node)
528 error ("Java method %qD has non-Java parameter type %qT",
536 /* Sanity check: report error if this function FUNCTION is not
537 really a member of the class (CTYPE) it is supposed to belong to.
538 TEMPLATE_PARMS is used to specify the template parameters of a member
539 template passed as FUNCTION_DECL. If the member template is passed as a
540 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
541 from the declaration. If the function is not a function template, it
543 It returns the original declaration for the function, NULL_TREE if
544 no declaration was found, error_mark_node if an error was emitted. */
547 check_classfn (tree ctype, tree function, tree template_parms)
553 if (DECL_USE_TEMPLATE (function)
554 && !(TREE_CODE (function) == TEMPLATE_DECL
555 && DECL_TEMPLATE_SPECIALIZATION (function))
556 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
557 /* Since this is a specialization of a member template,
558 we're not going to find the declaration in the class.
561 struct S { template <typename T> void f(T); };
562 template <> void S::f(int);
564 we're not going to find `S::f(int)', but there's no
565 reason we should, either. We let our callers know we didn't
566 find the method, but we don't complain. */
569 /* Basic sanity check: for a template function, the template parameters
570 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
571 if (TREE_CODE (function) == TEMPLATE_DECL)
573 gcc_assert (!template_parms
574 || comp_template_parms (template_parms,
575 DECL_TEMPLATE_PARMS (function)));
576 template_parms = DECL_TEMPLATE_PARMS (function);
579 /* OK, is this a definition of a member template? */
580 is_template = (template_parms != NULL_TREE);
582 /* We must enter the scope here, because conversion operators are
583 named by target type, and type equivalence relies on typenames
584 resolving within the scope of CTYPE. */
585 pushed_scope = push_scope (ctype);
586 ix = class_method_index_for_fn (complete_type (ctype), function);
589 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
590 tree fndecls, fndecl = 0;
592 const char *format = NULL;
594 for (fndecls = VEC_index (tree, methods, ix);
595 fndecls; fndecls = OVL_NEXT (fndecls))
599 fndecl = OVL_CURRENT (fndecls);
600 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
601 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
603 /* We cannot simply call decls_match because this doesn't
604 work for static member functions that are pretending to
605 be methods, and because the name may have been changed by
608 /* Get rid of the this parameter on functions that become
610 if (DECL_STATIC_FUNCTION_P (fndecl)
611 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
612 p1 = TREE_CHAIN (p1);
614 /* A member template definition only matches a member template
616 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
619 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
620 TREE_TYPE (TREE_TYPE (fndecl)))
621 && compparms (p1, p2)
623 || comp_template_parms (template_parms,
624 DECL_TEMPLATE_PARMS (fndecl)))
625 && (DECL_TEMPLATE_SPECIALIZATION (function)
626 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
627 && (!DECL_TEMPLATE_SPECIALIZATION (function)
628 || (DECL_TI_TEMPLATE (function)
629 == DECL_TI_TEMPLATE (fndecl))))
635 pop_scope (pushed_scope);
636 return OVL_CURRENT (fndecls);
639 error ("prototype for %q#D does not match any in class %qT",
641 is_conv_op = DECL_CONV_FN_P (fndecl);
644 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
645 fndecls = VEC_index (tree, methods, ix);
648 fndecl = OVL_CURRENT (fndecls);
649 fndecls = OVL_NEXT (fndecls);
651 if (!fndecls && is_conv_op)
653 if (VEC_length (tree, methods) > (size_t) ++ix)
655 fndecls = VEC_index (tree, methods, ix);
656 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
668 format = N_("candidates are: %+#D");
670 format = N_("candidate is: %+#D");
671 error (format, fndecl);
674 else if (!COMPLETE_TYPE_P (ctype))
675 cxx_incomplete_type_error (function, ctype);
677 error ("no %q#D member function declared in class %qT",
681 pop_scope (pushed_scope);
682 return error_mark_node;
685 /* DECL is a function with vague linkage. Remember it so that at the
686 end of the translation unit we can decide whether or not to emit
690 note_vague_linkage_fn (tree decl)
692 if (!DECL_DEFERRED_FN (decl))
694 DECL_DEFERRED_FN (decl) = 1;
695 DECL_DEFER_OUTPUT (decl) = 1;
696 VEC_safe_push (tree, gc, deferred_fns, decl);
700 /* We have just processed the DECL, which is a static data member.
701 The other parameters are as for cp_finish_decl. */
704 finish_static_data_member_decl (tree decl,
705 tree init, bool init_const_expr_p,
709 DECL_CONTEXT (decl) = current_class_type;
711 /* We cannot call pushdecl here, because that would fill in the
712 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
713 the right thing, namely, to put this decl out straight away. */
715 if (! processing_template_decl)
716 VEC_safe_push (tree, gc, pending_statics, decl);
718 if (LOCAL_CLASS_P (current_class_type))
719 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 /* Attribute vector_size handling wants to dive into the back end array
995 building code, which breaks during template processing. */
996 if (is_attribute_p ("vector_size", name)
997 /* Attribute weak handling wants to write out assembly right away. */
998 || is_attribute_p ("weak", name))
1001 /* If any of the arguments are dependent expressions, we can't evaluate
1002 the attribute until instantiation time. */
1003 for (arg = args; arg; arg = TREE_CHAIN (arg))
1005 tree t = TREE_VALUE (arg);
1006 if (value_dependent_expression_p (t)
1007 || type_dependent_expression_p (t))
1011 if (TREE_CODE (decl) == TYPE_DECL
1013 || spec->type_required)
1015 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1017 /* We can't apply any attributes to a completely unknown type until
1018 instantiation time. */
1019 enum tree_code code = TREE_CODE (type);
1020 if (code == TEMPLATE_TYPE_PARM
1021 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1022 || code == TYPENAME_TYPE)
1024 /* Also defer most attributes on dependent types. This is not
1025 necessary in all cases, but is the better default. */
1026 else if (dependent_type_p (type)
1027 /* But attribute visibility specifically works on
1029 && !is_attribute_p ("visibility", name))
1038 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1039 applied at instantiation time and return them. If IS_DEPENDENT is true,
1040 the declaration itself is dependent, so all attributes should be applied
1041 at instantiation time. */
1044 splice_template_attributes (tree *attr_p, tree decl)
1047 tree late_attrs = NULL_TREE;
1048 tree *q = &late_attrs;
1055 if (is_late_template_attribute (*p, decl))
1057 ATTR_IS_DEPENDENT (*p) = 1;
1059 *p = TREE_CHAIN (*p);
1060 q = &TREE_CHAIN (*q);
1064 p = &TREE_CHAIN (*p);
1070 /* Remove any late attributes from the list in ATTR_P and attach them to
1074 save_template_attributes (tree *attr_p, tree *decl_p)
1076 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1078 tree old_attrs = NULL_TREE;
1083 /* Give this type a name so we know to look it up again at instantiation
1085 if (TREE_CODE (*decl_p) == TYPE_DECL
1086 && DECL_ORIGINAL_TYPE (*decl_p) == NULL_TREE)
1088 tree oldt = TREE_TYPE (*decl_p);
1089 tree newt = build_variant_type_copy (oldt);
1090 DECL_ORIGINAL_TYPE (*decl_p) = oldt;
1091 TREE_TYPE (*decl_p) = newt;
1092 TYPE_NAME (newt) = *decl_p;
1093 TREE_USED (newt) = TREE_USED (*decl_p);
1096 if (DECL_P (*decl_p))
1097 q = &DECL_ATTRIBUTES (*decl_p);
1099 q = &TYPE_ATTRIBUTES (*decl_p);
1103 /* Place the late attributes at the beginning of the attribute
1105 TREE_CHAIN (tree_last (late_attrs)) = *q;
1108 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1110 /* We've added new attributes directly to the main variant, so
1111 now we need to update all of the other variants to include
1112 these new attributes. */
1114 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1115 variant = TYPE_NEXT_VARIANT (variant))
1117 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1118 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1123 /* Like decl_attributes, but handle C++ complexity. */
1126 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1128 if (*decl == NULL_TREE || *decl == void_type_node
1129 || *decl == error_mark_node
1130 || attributes == NULL_TREE)
1133 if (processing_template_decl)
1135 if (check_for_bare_parameter_packs (attributes))
1138 save_template_attributes (&attributes, decl);
1139 if (attributes == NULL_TREE)
1143 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1144 decl = &DECL_TEMPLATE_RESULT (*decl);
1146 decl_attributes (decl, attributes, flags);
1148 if (TREE_CODE (*decl) == TYPE_DECL)
1149 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1152 /* Walks through the namespace- or function-scope anonymous union
1153 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1154 Returns one of the fields for use in the mangled name. */
1157 build_anon_union_vars (tree type, tree object)
1159 tree main_decl = NULL_TREE;
1162 /* Rather than write the code to handle the non-union case,
1163 just give an error. */
1164 if (TREE_CODE (type) != UNION_TYPE)
1165 error ("anonymous struct not inside named type");
1167 for (field = TYPE_FIELDS (type);
1169 field = TREE_CHAIN (field))
1174 if (DECL_ARTIFICIAL (field))
1176 if (TREE_CODE (field) != FIELD_DECL)
1178 pedwarn ("%q+#D invalid; an anonymous union can only "
1179 "have non-static data members", field);
1183 if (TREE_PRIVATE (field))
1184 pedwarn ("private member %q+#D in anonymous union", field);
1185 else if (TREE_PROTECTED (field))
1186 pedwarn ("protected member %q+#D in anonymous union", field);
1188 if (processing_template_decl)
1189 ref = build_min_nt (COMPONENT_REF, object,
1190 DECL_NAME (field), NULL_TREE);
1192 ref = build_class_member_access_expr (object, field, NULL_TREE,
1195 if (DECL_NAME (field))
1199 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1200 DECL_ANON_UNION_VAR_P (decl) = 1;
1202 base = get_base_address (object);
1203 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1204 TREE_STATIC (decl) = TREE_STATIC (base);
1205 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1207 SET_DECL_VALUE_EXPR (decl, ref);
1208 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1210 decl = pushdecl (decl);
1212 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1213 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1217 if (main_decl == NULL_TREE)
1224 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1225 anonymous union, then all members must be laid out together. PUBLIC_P
1226 is nonzero if this union is not declared static. */
1229 finish_anon_union (tree anon_union_decl)
1235 if (anon_union_decl == error_mark_node)
1238 type = TREE_TYPE (anon_union_decl);
1239 public_p = TREE_PUBLIC (anon_union_decl);
1241 /* The VAR_DECL's context is the same as the TYPE's context. */
1242 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1244 if (TYPE_FIELDS (type) == NULL_TREE)
1249 error ("namespace-scope anonymous aggregates must be static");
1253 main_decl = build_anon_union_vars (type, anon_union_decl);
1254 if (main_decl == error_mark_node)
1256 if (main_decl == NULL_TREE)
1258 warning (0, "anonymous union with no members");
1262 if (!processing_template_decl)
1264 /* Use main_decl to set the mangled name. */
1265 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1266 mangle_decl (anon_union_decl);
1267 DECL_NAME (anon_union_decl) = NULL_TREE;
1270 pushdecl (anon_union_decl);
1271 if (building_stmt_tree ()
1272 && at_function_scope_p ())
1273 add_decl_expr (anon_union_decl);
1274 else if (!processing_template_decl)
1275 rest_of_decl_compilation (anon_union_decl,
1276 toplevel_bindings_p (), at_eof);
1279 /* Auxiliary functions to make type signatures for
1280 `operator new' and `operator delete' correspond to
1281 what compiler will be expecting. */
1284 coerce_new_type (tree type)
1287 tree args = TYPE_ARG_TYPES (type);
1289 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1291 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1294 error ("%<operator new%> must return type %qT", ptr_type_node);
1297 if (args && args != void_list_node)
1299 if (TREE_PURPOSE (args))
1301 /* [basic.stc.dynamic.allocation]
1303 The first parameter shall not have an associated default
1305 error ("the first parameter of %<operator new%> cannot "
1306 "have a default argument");
1307 /* Throw away the default argument. */
1308 TREE_PURPOSE (args) = NULL_TREE;
1311 if (!same_type_p (TREE_VALUE (args), size_type_node))
1314 args = TREE_CHAIN (args);
1321 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1322 "as first parameter", size_type_node);
1327 args = tree_cons (NULL_TREE, size_type_node, args);
1330 type = build_exception_variant
1331 (build_function_type (ptr_type_node, args),
1332 TYPE_RAISES_EXCEPTIONS (type));
1340 coerce_delete_type (tree type)
1343 tree args = TYPE_ARG_TYPES (type);
1345 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1347 if (!same_type_p (TREE_TYPE (type), void_type_node))
1350 error ("%<operator delete%> must return type %qT", void_type_node);
1353 if (!args || args == void_list_node
1354 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1357 if (args && args != void_list_node)
1358 args = TREE_CHAIN (args);
1359 error ("%<operator delete%> takes type %qT as first parameter",
1365 args = tree_cons (NULL_TREE, ptr_type_node, args);
1368 type = build_exception_variant
1369 (build_function_type (void_type_node, args),
1370 TYPE_RAISES_EXCEPTIONS (type));
1378 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1379 and mark them as needed. */
1382 mark_vtable_entries (tree decl)
1385 unsigned HOST_WIDE_INT idx;
1387 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1392 STRIP_NOPS (fnaddr);
1394 if (TREE_CODE (fnaddr) != ADDR_EXPR
1395 && TREE_CODE (fnaddr) != FDESC_EXPR)
1396 /* This entry is an offset: a virtual base class offset, a
1397 virtual call offset, an RTTI offset, etc. */
1400 fn = TREE_OPERAND (fnaddr, 0);
1401 TREE_ADDRESSABLE (fn) = 1;
1402 /* When we don't have vcall offsets, we output thunks whenever
1403 we output the vtables that contain them. With vcall offsets,
1404 we know all the thunks we'll need when we emit a virtual
1405 function, so we emit the thunks there instead. */
1406 if (DECL_THUNK_P (fn))
1407 use_thunk (fn, /*emit_p=*/0);
1412 /* Set DECL up to have the closest approximation of "initialized common"
1413 linkage available. */
1416 comdat_linkage (tree decl)
1419 make_decl_one_only (decl);
1420 else if (TREE_CODE (decl) == FUNCTION_DECL
1421 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1422 /* We can just emit function and compiler-generated variables
1423 statically; having multiple copies is (for the most part) only
1426 There are two correctness issues, however: the address of a
1427 template instantiation with external linkage should be the
1428 same, independent of what translation unit asks for the
1429 address, and this will not hold when we emit multiple copies of
1430 the function. However, there's little else we can do.
1432 Also, by default, the typeinfo implementation assumes that
1433 there will be only one copy of the string used as the name for
1434 each type. Therefore, if weak symbols are unavailable, the
1435 run-time library should perform a more conservative check; it
1436 should perform a string comparison, rather than an address
1438 TREE_PUBLIC (decl) = 0;
1441 /* Static data member template instantiations, however, cannot
1442 have multiple copies. */
1443 if (DECL_INITIAL (decl) == 0
1444 || DECL_INITIAL (decl) == error_mark_node)
1445 DECL_COMMON (decl) = 1;
1446 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1448 DECL_COMMON (decl) = 1;
1449 DECL_INITIAL (decl) = error_mark_node;
1451 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1453 /* We can't do anything useful; leave vars for explicit
1455 DECL_EXTERNAL (decl) = 1;
1456 DECL_NOT_REALLY_EXTERN (decl) = 0;
1460 if (DECL_LANG_SPECIFIC (decl))
1461 DECL_COMDAT (decl) = 1;
1464 /* For win32 we also want to put explicit instantiations in
1465 linkonce sections, so that they will be merged with implicit
1466 instantiations; otherwise we get duplicate symbol errors.
1467 For Darwin we do not want explicit instantiations to be
1471 maybe_make_one_only (tree decl)
1473 /* We used to say that this was not necessary on targets that support weak
1474 symbols, because the implicit instantiations will defer to the explicit
1475 one. However, that's not actually the case in SVR4; a strong definition
1476 after a weak one is an error. Also, not making explicit
1477 instantiations one_only means that we can end up with two copies of
1478 some template instantiations. */
1482 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1483 we can get away with not emitting them if they aren't used. We need
1484 to for variables so that cp_finish_decl will update their linkage,
1485 because their DECL_INITIAL may not have been set properly yet. */
1487 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1488 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1489 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1491 make_decl_one_only (decl);
1493 if (TREE_CODE (decl) == VAR_DECL)
1495 DECL_COMDAT (decl) = 1;
1496 /* Mark it needed so we don't forget to emit it. */
1497 mark_decl_referenced (decl);
1502 /* Determine whether or not we want to specifically import or export CTYPE,
1503 using various heuristics. */
1506 import_export_class (tree ctype)
1508 /* -1 for imported, 1 for exported. */
1509 int import_export = 0;
1511 /* It only makes sense to call this function at EOF. The reason is
1512 that this function looks at whether or not the first non-inline
1513 non-abstract virtual member function has been defined in this
1514 translation unit. But, we can't possibly know that until we've
1515 seen the entire translation unit. */
1516 gcc_assert (at_eof);
1518 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1521 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1522 we will have CLASSTYPE_INTERFACE_ONLY set but not
1523 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1524 heuristic because someone will supply a #pragma implementation
1525 elsewhere, and deducing it here would produce a conflict. */
1526 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1529 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1531 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1533 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1534 && !flag_implicit_templates)
1535 /* For a template class, without -fimplicit-templates, check the
1536 repository. If the virtual table is assigned to this
1537 translation unit, then export the class; otherwise, import
1539 import_export = repo_export_class_p (ctype) ? 1 : -1;
1540 else if (TYPE_POLYMORPHIC_P (ctype))
1542 /* The ABI specifies that the virtual table and associated
1543 information are emitted with the key method, if any. */
1544 tree method = CLASSTYPE_KEY_METHOD (ctype);
1545 /* If weak symbol support is not available, then we must be
1546 careful not to emit the vtable when the key function is
1547 inline. An inline function can be defined in multiple
1548 translation units. If we were to emit the vtable in each
1549 translation unit containing a definition, we would get
1550 multiple definition errors at link-time. */
1551 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1552 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1555 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1556 a definition anywhere else. */
1557 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1560 /* Allow back ends the chance to overrule the decision. */
1561 if (targetm.cxx.import_export_class)
1562 import_export = targetm.cxx.import_export_class (ctype, import_export);
1566 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1567 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1571 /* Return true if VAR has already been provided to the back end; in that
1572 case VAR should not be modified further by the front end. */
1574 var_finalized_p (tree var)
1576 return varpool_node (var)->finalized;
1579 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1580 must be emitted in this translation unit. Mark it as such. */
1583 mark_needed (tree decl)
1585 /* It's possible that we no longer need to set
1586 TREE_SYMBOL_REFERENCED here directly, but doing so is
1588 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1589 mark_decl_referenced (decl);
1592 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1593 returns true if a definition of this entity should be provided in
1594 this object file. Callers use this function to determine whether
1595 or not to let the back end know that a definition of DECL is
1596 available in this translation unit. */
1599 decl_needed_p (tree decl)
1601 gcc_assert (TREE_CODE (decl) == VAR_DECL
1602 || TREE_CODE (decl) == FUNCTION_DECL);
1603 /* This function should only be called at the end of the translation
1604 unit. We cannot be sure of whether or not something will be
1605 COMDAT until that point. */
1606 gcc_assert (at_eof);
1608 /* All entities with external linkage that are not COMDAT should be
1609 emitted; they may be referred to from other object files. */
1610 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1612 /* If this entity was used, let the back end see it; it will decide
1613 whether or not to emit it into the object file. */
1614 if (TREE_USED (decl)
1615 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1616 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1618 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1619 reference to DECL might cause it to be emitted later. */
1623 /* If necessary, write out the vtables for the dynamic class CTYPE.
1624 Returns true if any vtables were emitted. */
1627 maybe_emit_vtables (tree ctype)
1633 /* If the vtables for this class have already been emitted there is
1634 nothing more to do. */
1635 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1636 if (var_finalized_p (primary_vtbl))
1638 /* Ignore dummy vtables made by get_vtable_decl. */
1639 if (TREE_TYPE (primary_vtbl) == void_type_node)
1642 /* On some targets, we cannot determine the key method until the end
1643 of the translation unit -- which is when this function is
1645 if (!targetm.cxx.key_method_may_be_inline ())
1646 determine_key_method (ctype);
1648 /* See if any of the vtables are needed. */
1649 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1651 import_export_decl (vtbl);
1652 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1657 /* If the references to this class' vtables are optimized away,
1658 still emit the appropriate debugging information. See
1660 if (DECL_COMDAT (primary_vtbl)
1661 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1662 note_debug_info_needed (ctype);
1666 /* The ABI requires that we emit all of the vtables if we emit any
1668 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1670 /* Mark entities references from the virtual table as used. */
1671 mark_vtable_entries (vtbl);
1673 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1675 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1677 /* It had better be all done at compile-time. */
1682 DECL_EXTERNAL (vtbl) = 0;
1683 rest_of_decl_compilation (vtbl, 1, 1);
1685 /* Because we're only doing syntax-checking, we'll never end up
1686 actually marking the variable as written. */
1687 if (flag_syntax_only)
1688 TREE_ASM_WRITTEN (vtbl) = 1;
1691 /* Since we're writing out the vtable here, also write the debug
1693 note_debug_info_needed (ctype);
1698 /* A special return value from type_visibility meaning internal
1701 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1703 /* walk_tree helper function for type_visibility. */
1706 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1708 int *vis_p = (int *)data;
1713 else if (CLASS_TYPE_P (*tp))
1715 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1717 *vis_p = VISIBILITY_ANON;
1720 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1721 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1726 /* Returns the visibility of TYPE, which is the minimum visibility of its
1730 type_visibility (tree type)
1732 int vis = VISIBILITY_DEFAULT;
1733 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1737 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1738 specified (or if VISIBILITY is static). */
1741 constrain_visibility (tree decl, int visibility)
1743 if (visibility == VISIBILITY_ANON)
1745 /* extern "C" declarations aren't affected by the anonymous
1747 if (!DECL_EXTERN_C_P (decl))
1749 TREE_PUBLIC (decl) = 0;
1750 DECL_ONE_ONLY (decl) = 0;
1751 DECL_INTERFACE_KNOWN (decl) = 1;
1752 if (DECL_LANG_SPECIFIC (decl))
1753 DECL_NOT_REALLY_EXTERN (decl) = 1;
1756 else if (visibility > DECL_VISIBILITY (decl)
1757 && !DECL_VISIBILITY_SPECIFIED (decl))
1759 DECL_VISIBILITY (decl) = visibility;
1765 /* Constrain the visibility of DECL based on the visibility of its template
1769 constrain_visibility_for_template (tree decl, tree targs)
1771 /* If this is a template instantiation, check the innermost
1772 template args for visibility constraints. The outer template
1773 args are covered by the class check. */
1774 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1776 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1780 tree arg = TREE_VEC_ELT (args, i-1);
1782 vis = type_visibility (arg);
1783 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1786 if (TREE_CODE (arg) == ADDR_EXPR)
1787 arg = TREE_OPERAND (arg, 0);
1788 if (TREE_CODE (arg) == VAR_DECL
1789 || TREE_CODE (arg) == FUNCTION_DECL)
1791 if (! TREE_PUBLIC (arg))
1792 vis = VISIBILITY_ANON;
1794 vis = DECL_VISIBILITY (arg);
1798 constrain_visibility (decl, vis);
1802 /* Like c_determine_visibility, but with additional C++-specific
1805 Function-scope entities can rely on the function's visibility because
1806 it is set in start_preparsed_function.
1808 Class-scope entities cannot rely on the class's visibility until the end
1809 of the enclosing class definition.
1811 Note that because namespaces have multiple independent definitions,
1812 namespace visibility is handled elsewhere using the #pragma visibility
1813 machinery rather than by decorating the namespace declaration.
1815 The goal is for constraints from the type to give a diagnostic, and
1816 other constraints to be applied silently. */
1819 determine_visibility (tree decl)
1821 tree class_type = NULL_TREE;
1824 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1826 /* Only relevant for names with external linkage. */
1827 if (!TREE_PUBLIC (decl))
1830 /* Cloned constructors and destructors get the same visibility as
1831 the underlying function. That should be set up in
1832 maybe_clone_body. */
1833 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1835 if (TREE_CODE (decl) == TYPE_DECL)
1837 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1838 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1839 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1844 else if (DECL_LANG_SPECIFIC (decl))
1845 use_template = DECL_USE_TEMPLATE (decl);
1849 /* If DECL is a member of a class, visibility specifiers on the
1850 class can influence the visibility of the DECL. */
1851 if (DECL_CLASS_SCOPE_P (decl))
1852 class_type = DECL_CONTEXT (decl);
1855 /* Not a class member. */
1857 /* Virtual tables have DECL_CONTEXT set to their associated class,
1858 so they are automatically handled above. */
1859 gcc_assert (TREE_CODE (decl) != VAR_DECL
1860 || !DECL_VTABLE_OR_VTT_P (decl));
1862 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1864 /* Local statics and classes get the visibility of their
1865 containing function by default, except that
1866 -fvisibility-inlines-hidden doesn't affect them. */
1867 tree fn = DECL_CONTEXT (decl);
1868 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1870 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1871 DECL_VISIBILITY_SPECIFIED (decl) =
1872 DECL_VISIBILITY_SPECIFIED (fn);
1875 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1877 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1878 but have no TEMPLATE_INFO, so don't try to check it. */
1881 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1882 && flag_visibility_ms_compat)
1884 /* Under -fvisibility-ms-compat, types are visible by default,
1885 even though their contents aren't. */
1886 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1887 int underlying_vis = type_visibility (underlying_type);
1888 if (underlying_vis == VISIBILITY_ANON
1889 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1890 constrain_visibility (decl, underlying_vis);
1892 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1894 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1896 /* tinfo visibility is based on the type it's for. */
1897 constrain_visibility
1898 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1900 else if (use_template)
1901 /* Template instantiations and specializations get visibility based
1902 on their template unless they override it with an attribute. */;
1903 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1905 /* Set default visibility to whatever the user supplied with
1906 #pragma GCC visibility or a namespace visibility attribute. */
1907 DECL_VISIBILITY (decl) = default_visibility;
1908 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1914 /* If the specialization doesn't specify visibility, use the
1915 visibility from the template. */
1916 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1917 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1918 : DECL_TEMPLATE_INFO (decl));
1919 tree args = TI_ARGS (tinfo);
1921 if (args != error_mark_node)
1923 int depth = TMPL_ARGS_DEPTH (args);
1924 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1926 if (!DECL_VISIBILITY_SPECIFIED (decl))
1928 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1929 DECL_VISIBILITY_SPECIFIED (decl)
1930 = DECL_VISIBILITY_SPECIFIED (pattern);
1933 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1934 if (args && depth > template_class_depth (class_type))
1935 /* Limit visibility based on its template arguments. */
1936 constrain_visibility_for_template (decl, args);
1941 determine_visibility_from_class (decl, class_type);
1943 if (decl_anon_ns_mem_p (decl))
1944 /* Names in an anonymous namespace get internal linkage.
1945 This might change once we implement export. */
1946 constrain_visibility (decl, VISIBILITY_ANON);
1947 else if (TREE_CODE (decl) != TYPE_DECL)
1949 /* Propagate anonymity from type to decl. */
1950 int tvis = type_visibility (TREE_TYPE (decl));
1951 if (tvis == VISIBILITY_ANON
1952 || ! DECL_VISIBILITY_SPECIFIED (decl))
1953 constrain_visibility (decl, tvis);
1957 /* By default, static data members and function members receive
1958 the visibility of their containing class. */
1961 determine_visibility_from_class (tree decl, tree class_type)
1963 if (DECL_VISIBILITY_SPECIFIED (decl))
1966 if (visibility_options.inlines_hidden
1967 /* Don't do this for inline templates; specializations might not be
1968 inline, and we don't want them to inherit the hidden
1969 visibility. We'll set it here for all inline instantiations. */
1970 && !processing_template_decl
1971 && TREE_CODE (decl) == FUNCTION_DECL
1972 && DECL_DECLARED_INLINE_P (decl)
1973 && (! DECL_LANG_SPECIFIC (decl)
1974 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1975 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1978 /* Default to the class visibility. */
1979 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1980 DECL_VISIBILITY_SPECIFIED (decl)
1981 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1984 /* Give the target a chance to override the visibility associated
1986 if (TREE_CODE (decl) == VAR_DECL
1987 && (DECL_TINFO_P (decl)
1988 || (DECL_VTABLE_OR_VTT_P (decl)
1989 /* Construction virtual tables are not exported because
1990 they cannot be referred to from other object files;
1991 their name is not standardized by the ABI. */
1992 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1993 && TREE_PUBLIC (decl)
1994 && !DECL_REALLY_EXTERN (decl)
1995 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1996 targetm.cxx.determine_class_data_visibility (decl);
1999 /* Constrain the visibility of a class TYPE based on the visibility of its
2000 field types. Warn if any fields require lesser visibility. */
2003 constrain_class_visibility (tree type)
2009 int vis = type_visibility (type);
2011 if (vis == VISIBILITY_ANON
2012 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2015 /* Don't warn about visibility if the class has explicit visibility. */
2016 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2017 vis = VISIBILITY_INTERNAL;
2019 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2020 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2022 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2023 int subvis = type_visibility (ftype);
2025 if (subvis == VISIBILITY_ANON)
2027 if (!in_main_input_context ())
2029 %qT has a field %qD whose type uses the anonymous namespace",
2032 else if (MAYBE_CLASS_TYPE_P (ftype)
2033 && vis < VISIBILITY_HIDDEN
2034 && subvis >= VISIBILITY_HIDDEN)
2035 warning (OPT_Wattributes, "\
2036 %qT declared with greater visibility than the type of its field %qD",
2040 binfo = TYPE_BINFO (type);
2041 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2043 int subvis = type_visibility (TREE_TYPE (t));
2045 if (subvis == VISIBILITY_ANON)
2047 if (!in_main_input_context())
2049 %qT has a base %qT whose type uses the anonymous namespace",
2050 type, TREE_TYPE (t));
2052 else if (vis < VISIBILITY_HIDDEN
2053 && subvis >= VISIBILITY_HIDDEN)
2054 warning (OPT_Wattributes, "\
2055 %qT declared with greater visibility than its base %qT",
2056 type, TREE_TYPE (t));
2060 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2061 for DECL has not already been determined, do so now by setting
2062 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2063 function is called entities with vague linkage whose definitions
2064 are available must have TREE_PUBLIC set.
2066 If this function decides to place DECL in COMDAT, it will set
2067 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2068 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2069 callers defer that decision until it is clear that DECL is actually
2073 import_export_decl (tree decl)
2078 tree class_type = NULL_TREE;
2080 if (DECL_INTERFACE_KNOWN (decl))
2083 /* We cannot determine what linkage to give to an entity with vague
2084 linkage until the end of the file. For example, a virtual table
2085 for a class will be defined if and only if the key method is
2086 defined in this translation unit. As a further example, consider
2087 that when compiling a translation unit that uses PCH file with
2088 "-frepo" it would be incorrect to make decisions about what
2089 entities to emit when building the PCH; those decisions must be
2090 delayed until the repository information has been processed. */
2091 gcc_assert (at_eof);
2092 /* Object file linkage for explicit instantiations is handled in
2093 mark_decl_instantiated. For static variables in functions with
2094 vague linkage, maybe_commonize_var is used.
2096 Therefore, the only declarations that should be provided to this
2097 function are those with external linkage that are:
2099 * implicit instantiations of function templates
2103 * implicit instantiations of static data members of class
2110 Furthermore, all entities that reach this point must have a
2111 definition available in this translation unit.
2113 The following assertions check these conditions. */
2114 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2115 || TREE_CODE (decl) == VAR_DECL);
2116 /* Any code that creates entities with TREE_PUBLIC cleared should
2117 also set DECL_INTERFACE_KNOWN. */
2118 gcc_assert (TREE_PUBLIC (decl));
2119 if (TREE_CODE (decl) == FUNCTION_DECL)
2120 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2121 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2122 || DECL_DECLARED_INLINE_P (decl));
2124 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2125 || DECL_VTABLE_OR_VTT_P (decl)
2126 || DECL_TINFO_P (decl));
2127 /* Check that a definition of DECL is available in this translation
2129 gcc_assert (!DECL_REALLY_EXTERN (decl));
2131 /* Assume that DECL will not have COMDAT linkage. */
2133 /* Assume that DECL will not be imported into this translation
2137 /* See if the repository tells us whether or not to emit DECL in
2138 this translation unit. */
2139 emit_p = repo_emit_p (decl);
2142 else if (emit_p == 1)
2144 /* The repository indicates that this entity should be defined
2145 here. Make sure the back end honors that request. */
2146 if (TREE_CODE (decl) == VAR_DECL)
2148 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2149 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2152 FOR_EACH_CLONE (clone, decl)
2153 mark_needed (clone);
2157 /* Output the definition as an ordinary strong definition. */
2158 DECL_EXTERNAL (decl) = 0;
2159 DECL_INTERFACE_KNOWN (decl) = 1;
2164 /* We have already decided what to do with this DECL; there is no
2165 need to check anything further. */
2167 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2169 class_type = DECL_CONTEXT (decl);
2170 import_export_class (class_type);
2171 if (TYPE_FOR_JAVA (class_type))
2173 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2174 && CLASSTYPE_INTERFACE_ONLY (class_type))
2176 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2177 && !CLASSTYPE_USE_TEMPLATE (class_type)
2178 && CLASSTYPE_KEY_METHOD (class_type)
2179 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2180 /* The ABI requires that all virtual tables be emitted with
2181 COMDAT linkage. However, on systems where COMDAT symbols
2182 don't show up in the table of contents for a static
2183 archive, or on systems without weak symbols (where we
2184 approximate COMDAT linkage by using internal linkage), the
2185 linker will report errors about undefined symbols because
2186 it will not see the virtual table definition. Therefore,
2187 in the case that we know that the virtual table will be
2188 emitted in only one translation unit, we make the virtual
2189 table an ordinary definition with external linkage. */
2190 DECL_EXTERNAL (decl) = 0;
2191 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2193 /* CLASS_TYPE is being exported from this translation unit,
2194 so DECL should be defined here. */
2195 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2196 /* If a class is declared in a header with the "extern
2197 template" extension, then it will not be instantiated,
2198 even in translation units that would normally require
2199 it. Often such classes are explicitly instantiated in
2200 one translation unit. Therefore, the explicit
2201 instantiation must be made visible to other translation
2203 DECL_EXTERNAL (decl) = 0;
2206 /* The generic C++ ABI says that class data is always
2207 COMDAT, even if there is a key function. Some
2208 variants (e.g., the ARM EABI) says that class data
2209 only has COMDAT linkage if the class data might be
2210 emitted in more than one translation unit. When the
2211 key method can be inline and is inline, we still have
2212 to arrange for comdat even though
2213 class_data_always_comdat is false. */
2214 if (!CLASSTYPE_KEY_METHOD (class_type)
2215 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2216 || targetm.cxx.class_data_always_comdat ())
2218 /* The ABI requires COMDAT linkage. Normally, we
2219 only emit COMDAT things when they are needed;
2220 make sure that we realize that this entity is
2227 else if (!flag_implicit_templates
2228 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2233 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2235 tree type = TREE_TYPE (DECL_NAME (decl));
2236 if (CLASS_TYPE_P (type))
2239 import_export_class (type);
2240 if (CLASSTYPE_INTERFACE_KNOWN (type)
2241 && TYPE_POLYMORPHIC_P (type)
2242 && CLASSTYPE_INTERFACE_ONLY (type)
2243 /* If -fno-rtti was specified, then we cannot be sure
2244 that RTTI information will be emitted with the
2245 virtual table of the class, so we must emit it
2246 wherever it is used. */
2251 if (CLASSTYPE_INTERFACE_KNOWN (type)
2252 && !CLASSTYPE_INTERFACE_ONLY (type))
2254 comdat_p = (targetm.cxx.class_data_always_comdat ()
2255 || (CLASSTYPE_KEY_METHOD (type)
2256 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2261 DECL_EXTERNAL (decl) = 0;
2271 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2272 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2274 /* DECL is an implicit instantiation of a function or static
2276 if ((flag_implicit_templates
2277 && !flag_use_repository)
2278 || (flag_implicit_inline_templates
2279 && TREE_CODE (decl) == FUNCTION_DECL
2280 && DECL_DECLARED_INLINE_P (decl)))
2283 /* If we are not implicitly generating templates, then mark
2284 this entity as undefined in this translation unit. */
2287 else if (DECL_FUNCTION_MEMBER_P (decl))
2289 if (!DECL_DECLARED_INLINE_P (decl))
2291 tree ctype = DECL_CONTEXT (decl);
2292 import_export_class (ctype);
2293 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2295 DECL_NOT_REALLY_EXTERN (decl)
2296 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2297 || (DECL_DECLARED_INLINE_P (decl)
2298 && ! flag_implement_inlines
2299 && !DECL_VINDEX (decl)));
2301 if (!DECL_NOT_REALLY_EXTERN (decl))
2302 DECL_EXTERNAL (decl) = 1;
2304 /* Always make artificials weak. */
2305 if (DECL_ARTIFICIAL (decl) && flag_weak)
2308 maybe_make_one_only (decl);
2319 /* If we are importing DECL into this translation unit, mark is
2320 an undefined here. */
2321 DECL_EXTERNAL (decl) = 1;
2322 DECL_NOT_REALLY_EXTERN (decl) = 0;
2326 /* If we decided to put DECL in COMDAT, mark it accordingly at
2328 comdat_linkage (decl);
2331 DECL_INTERFACE_KNOWN (decl) = 1;
2334 /* Return an expression that performs the destruction of DECL, which
2335 must be a VAR_DECL whose type has a non-trivial destructor, or is
2336 an array whose (innermost) elements have a non-trivial destructor. */
2339 build_cleanup (tree decl)
2342 tree type = TREE_TYPE (decl);
2344 /* This function should only be called for declarations that really
2345 require cleanups. */
2346 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2348 /* Treat all objects with destructors as used; the destructor may do
2349 something substantive. */
2352 if (TREE_CODE (type) == ARRAY_TYPE)
2355 temp = build_address (decl);
2356 temp = build_delete (TREE_TYPE (temp), temp,
2357 sfk_complete_destructor,
2358 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2362 /* Returns the initialization guard variable for the variable DECL,
2363 which has static storage duration. */
2366 get_guard (tree decl)
2371 sname = mangle_guard_variable (decl);
2372 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2377 /* We use a type that is big enough to contain a mutex as well
2378 as an integer counter. */
2379 guard_type = targetm.cxx.guard_type ();
2380 guard = build_decl (VAR_DECL, sname, guard_type);
2382 /* The guard should have the same linkage as what it guards. */
2383 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2384 TREE_STATIC (guard) = TREE_STATIC (decl);
2385 DECL_COMMON (guard) = DECL_COMMON (decl);
2386 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2387 if (TREE_PUBLIC (decl))
2388 DECL_WEAK (guard) = DECL_WEAK (decl);
2389 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2390 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2392 DECL_ARTIFICIAL (guard) = 1;
2393 DECL_IGNORED_P (guard) = 1;
2394 TREE_USED (guard) = 1;
2395 pushdecl_top_level_and_finish (guard, NULL_TREE);
2400 /* Return those bits of the GUARD variable that should be set when the
2401 guarded entity is actually initialized. */
2404 get_guard_bits (tree guard)
2406 if (!targetm.cxx.guard_mask_bit ())
2408 /* We only set the first byte of the guard, in order to leave room
2409 for a mutex in the high-order bits. */
2410 guard = build1 (ADDR_EXPR,
2411 build_pointer_type (TREE_TYPE (guard)),
2413 guard = build1 (NOP_EXPR,
2414 build_pointer_type (char_type_node),
2416 guard = build1 (INDIRECT_REF, char_type_node, guard);
2422 /* Return an expression which determines whether or not the GUARD
2423 variable has already been initialized. */
2426 get_guard_cond (tree guard)
2430 /* Check to see if the GUARD is zero. */
2431 guard = get_guard_bits (guard);
2433 /* Mask off all but the low bit. */
2434 if (targetm.cxx.guard_mask_bit ())
2436 guard_value = integer_one_node;
2437 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2438 guard_value = convert (TREE_TYPE (guard), guard_value);
2439 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2442 guard_value = integer_zero_node;
2443 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2444 guard_value = convert (TREE_TYPE (guard), guard_value);
2445 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2448 /* Return an expression which sets the GUARD variable, indicating that
2449 the variable being guarded has been initialized. */
2452 set_guard (tree guard)
2456 /* Set the GUARD to one. */
2457 guard = get_guard_bits (guard);
2458 guard_init = integer_one_node;
2459 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2460 guard_init = convert (TREE_TYPE (guard), guard_init);
2461 return build_modify_expr (guard, NOP_EXPR, guard_init);
2464 /* Start the process of running a particular set of global constructors
2465 or destructors. Subroutine of do_[cd]tors. */
2468 start_objects (int method_type, int initp)
2474 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2476 if (initp != DEFAULT_INIT_PRIORITY)
2486 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2489 sprintf (type, "%c", method_type);
2491 fndecl = build_lang_decl (FUNCTION_DECL,
2492 get_file_function_name (type),
2493 build_function_type (void_type_node,
2495 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2497 TREE_PUBLIC (current_function_decl) = 0;
2499 /* Mark as artificial because it's not explicitly in the user's
2501 DECL_ARTIFICIAL (current_function_decl) = 1;
2503 /* Mark this declaration as used to avoid spurious warnings. */
2504 TREE_USED (current_function_decl) = 1;
2506 /* Mark this function as a global constructor or destructor. */
2507 if (method_type == 'I')
2508 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2510 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2511 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2513 body = begin_compound_stmt (BCS_FN_BODY);
2518 /* Finish the process of running a particular set of global constructors
2519 or destructors. Subroutine of do_[cd]tors. */
2522 finish_objects (int method_type, int initp, tree body)
2527 finish_compound_stmt (body);
2528 fn = finish_function (0);
2530 if (method_type == 'I')
2532 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2533 decl_init_priority_insert (fn, initp);
2537 DECL_STATIC_DESTRUCTOR (fn) = 1;
2538 decl_fini_priority_insert (fn, initp);
2541 expand_or_defer_fn (fn);
2544 /* The names of the parameters to the function created to handle
2545 initializations and destructions for objects with static storage
2547 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2548 #define PRIORITY_IDENTIFIER "__priority"
2550 /* The name of the function we create to handle initializations and
2551 destructions for objects with static storage duration. */
2552 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2554 /* The declaration for the __INITIALIZE_P argument. */
2555 static GTY(()) tree initialize_p_decl;
2557 /* The declaration for the __PRIORITY argument. */
2558 static GTY(()) tree priority_decl;
2560 /* The declaration for the static storage duration function. */
2561 static GTY(()) tree ssdf_decl;
2563 /* All the static storage duration functions created in this
2564 translation unit. */
2565 static GTY(()) VEC(tree,gc) *ssdf_decls;
2567 /* A map from priority levels to information about that priority
2568 level. There may be many such levels, so efficient lookup is
2570 static splay_tree priority_info_map;
2572 /* Begins the generation of the function that will handle all
2573 initialization and destruction of objects with static storage
2574 duration. The function generated takes two parameters of type
2575 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2576 nonzero, it performs initializations. Otherwise, it performs
2577 destructions. It only performs those initializations or
2578 destructions with the indicated __PRIORITY. The generated function
2581 It is assumed that this function will only be called once per
2582 translation unit. */
2585 start_static_storage_duration_function (unsigned count)
2590 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2592 /* Create the identifier for this function. It will be of the form
2593 SSDF_IDENTIFIER_<number>. */
2594 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2596 /* Create the parameters. */
2597 parm_types = void_list_node;
2598 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2599 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2600 type = build_function_type (void_type_node, parm_types);
2602 /* Create the FUNCTION_DECL itself. */
2603 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2604 get_identifier (id),
2606 TREE_PUBLIC (ssdf_decl) = 0;
2607 DECL_ARTIFICIAL (ssdf_decl) = 1;
2608 DECL_INLINE (ssdf_decl) = 1;
2610 /* Put this function in the list of functions to be called from the
2611 static constructors and destructors. */
2614 ssdf_decls = VEC_alloc (tree, gc, 32);
2616 /* Take this opportunity to initialize the map from priority
2617 numbers to information about that priority level. */
2618 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2619 /*delete_key_fn=*/0,
2620 /*delete_value_fn=*/
2621 (splay_tree_delete_value_fn) &free);
2623 /* We always need to generate functions for the
2624 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2625 priorities later, we'll be sure to find the
2626 DEFAULT_INIT_PRIORITY. */
2627 get_priority_info (DEFAULT_INIT_PRIORITY);
2630 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2632 /* Create the argument list. */
2633 initialize_p_decl = cp_build_parm_decl
2634 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2635 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2636 TREE_USED (initialize_p_decl) = 1;
2637 priority_decl = cp_build_parm_decl
2638 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2639 DECL_CONTEXT (priority_decl) = ssdf_decl;
2640 TREE_USED (priority_decl) = 1;
2642 TREE_CHAIN (initialize_p_decl) = priority_decl;
2643 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2645 /* Put the function in the global scope. */
2646 pushdecl (ssdf_decl);
2648 /* Start the function itself. This is equivalent to declaring the
2651 static void __ssdf (int __initialize_p, init __priority_p);
2653 It is static because we only need to call this function from the
2654 various constructor and destructor functions for this module. */
2655 start_preparsed_function (ssdf_decl,
2656 /*attrs=*/NULL_TREE,
2659 /* Set up the scope of the outermost block in the function. */
2660 body = begin_compound_stmt (BCS_FN_BODY);
2665 /* Finish the generation of the function which performs initialization
2666 and destruction of objects with static storage duration. After
2667 this point, no more such objects can be created. */
2670 finish_static_storage_duration_function (tree body)
2672 /* Close out the function. */
2673 finish_compound_stmt (body);
2674 expand_or_defer_fn (finish_function (0));
2677 /* Return the information about the indicated PRIORITY level. If no
2678 code to handle this level has yet been generated, generate the
2679 appropriate prologue. */
2681 static priority_info
2682 get_priority_info (int priority)
2687 n = splay_tree_lookup (priority_info_map,
2688 (splay_tree_key) priority);
2691 /* Create a new priority information structure, and insert it
2693 pi = XNEW (struct priority_info_s);
2694 pi->initializations_p = 0;
2695 pi->destructions_p = 0;
2696 splay_tree_insert (priority_info_map,
2697 (splay_tree_key) priority,
2698 (splay_tree_value) pi);
2701 pi = (priority_info) n->value;
2706 /* The effective initialization priority of a DECL. */
2708 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2709 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2710 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2712 /* Whether a DECL needs a guard to protect it against multiple
2715 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2716 || DECL_ONE_ONLY (decl) \
2717 || DECL_WEAK (decl)))
2719 /* Set up to handle the initialization or destruction of DECL. If
2720 INITP is nonzero, we are initializing the variable. Otherwise, we
2721 are destroying it. */
2724 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2726 tree guard_if_stmt = NULL_TREE;
2729 /* If we are supposed to destruct and there's a trivial destructor,
2730 nothing has to be done. */
2732 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2735 /* Trick the compiler into thinking we are at the file and line
2736 where DECL was declared so that error-messages make sense, and so
2737 that the debugger will show somewhat sensible file and line
2739 input_location = DECL_SOURCE_LOCATION (decl);
2745 Access control for implicit calls to the constructors,
2746 the conversion functions, or the destructor called to
2747 create and destroy a static data member is performed as
2748 if these calls appeared in the scope of the member's
2751 we pretend we are in a static member function of the class of
2752 which the DECL is a member. */
2753 if (member_p (decl))
2755 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2756 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2759 /* Assume we don't need a guard. */
2761 /* We need a guard if this is an object with external linkage that
2762 might be initialized in more than one place. (For example, a
2763 static data member of a template, when the data member requires
2765 if (NEEDS_GUARD_P (decl))
2769 guard = get_guard (decl);
2771 /* When using __cxa_atexit, we just check the GUARD as we would
2772 for a local static. */
2773 if (flag_use_cxa_atexit)
2775 /* When using __cxa_atexit, we never try to destroy
2776 anything from a static destructor. */
2778 guard_cond = get_guard_cond (guard);
2780 /* If we don't have __cxa_atexit, then we will be running
2781 destructors from .fini sections, or their equivalents. So,
2782 we need to know how many times we've tried to initialize this
2783 object. We do initializations only if the GUARD is zero,
2784 i.e., if we are the first to initialize the variable. We do
2785 destructions only if the GUARD is one, i.e., if we are the
2786 last to destroy the variable. */
2789 = cp_build_binary_op (EQ_EXPR,
2790 build_unary_op (PREINCREMENT_EXPR,
2796 = cp_build_binary_op (EQ_EXPR,
2797 build_unary_op (PREDECREMENT_EXPR,
2802 guard_if_stmt = begin_if_stmt ();
2803 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2807 /* If we're using __cxa_atexit, we have not already set the GUARD,
2808 so we must do so now. */
2809 if (guard && initp && flag_use_cxa_atexit)
2810 finish_expr_stmt (set_guard (guard));
2812 /* Perform the initialization or destruction. */
2816 finish_expr_stmt (init);
2818 /* If we're using __cxa_atexit, register a function that calls the
2819 destructor for the object. */
2820 if (flag_use_cxa_atexit)
2821 finish_expr_stmt (register_dtor_fn (decl));
2824 finish_expr_stmt (build_cleanup (decl));
2826 /* Finish the guard if-stmt, if necessary. */
2829 finish_then_clause (guard_if_stmt);
2830 finish_if_stmt (guard_if_stmt);
2833 /* Now that we're done with DECL we don't need to pretend to be a
2834 member of its class any longer. */
2835 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2836 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2839 /* Generate code to do the initialization or destruction of the decls in VARS,
2840 a TREE_LIST of VAR_DECL with static storage duration.
2841 Whether initialization or destruction is performed is specified by INITP. */
2844 do_static_initialization_or_destruction (tree vars, bool initp)
2846 tree node, init_if_stmt, cond;
2848 /* Build the outer if-stmt to check for initialization or destruction. */
2849 init_if_stmt = begin_if_stmt ();
2850 cond = initp ? integer_one_node : integer_zero_node;
2851 cond = cp_build_binary_op (EQ_EXPR,
2854 finish_if_stmt_cond (cond, init_if_stmt);
2858 tree decl = TREE_VALUE (node);
2859 tree priority_if_stmt;
2863 /* If we don't need a destructor, there's nothing to do. Avoid
2864 creating a possibly empty if-stmt. */
2865 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2867 node = TREE_CHAIN (node);
2871 /* Remember that we had an initialization or finalization at this
2873 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2874 pi = get_priority_info (priority);
2876 pi->initializations_p = 1;
2878 pi->destructions_p = 1;
2880 /* Conditionalize this initialization on being in the right priority
2881 and being initializing/finalizing appropriately. */
2882 priority_if_stmt = begin_if_stmt ();
2883 cond = cp_build_binary_op (EQ_EXPR,
2885 build_int_cst (NULL_TREE, priority));
2886 finish_if_stmt_cond (cond, priority_if_stmt);
2888 /* Process initializers with same priority. */
2890 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2891 node = TREE_CHAIN (node))
2892 /* Do one initialization or destruction. */
2893 one_static_initialization_or_destruction (TREE_VALUE (node),
2894 TREE_PURPOSE (node), initp);
2896 /* Finish up the priority if-stmt body. */
2897 finish_then_clause (priority_if_stmt);
2898 finish_if_stmt (priority_if_stmt);
2902 /* Finish up the init/destruct if-stmt body. */
2903 finish_then_clause (init_if_stmt);
2904 finish_if_stmt (init_if_stmt);
2907 /* VARS is a list of variables with static storage duration which may
2908 need initialization and/or finalization. Remove those variables
2909 that don't really need to be initialized or finalized, and return
2910 the resulting list. The order in which the variables appear in
2911 VARS is in reverse order of the order in which they should actually
2912 be initialized. The list we return is in the unreversed order;
2913 i.e., the first variable should be initialized first. */
2916 prune_vars_needing_no_initialization (tree *vars)
2919 tree result = NULL_TREE;
2924 tree decl = TREE_VALUE (t);
2925 tree init = TREE_PURPOSE (t);
2927 /* Deal gracefully with error. */
2928 if (decl == error_mark_node)
2930 var = &TREE_CHAIN (t);
2934 /* The only things that can be initialized are variables. */
2935 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2937 /* If this object is not defined, we don't need to do anything
2939 if (DECL_EXTERNAL (decl))
2941 var = &TREE_CHAIN (t);
2945 /* Also, if the initializer already contains errors, we can bail
2947 if (init && TREE_CODE (init) == TREE_LIST
2948 && value_member (error_mark_node, init))
2950 var = &TREE_CHAIN (t);
2954 /* This variable is going to need initialization and/or
2955 finalization, so we add it to the list. */
2956 *var = TREE_CHAIN (t);
2957 TREE_CHAIN (t) = result;
2964 /* Make sure we have told the back end about all the variables in
2968 write_out_vars (tree vars)
2972 for (v = vars; v; v = TREE_CHAIN (v))
2974 tree var = TREE_VALUE (v);
2975 if (!var_finalized_p (var))
2977 import_export_decl (var);
2978 rest_of_decl_compilation (var, 1, 1);
2983 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2984 (otherwise) that will initialize all global objects with static
2985 storage duration having the indicated PRIORITY. */
2988 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2997 input_location = *locus;
2999 /* Was: locus->line++; */
3001 /* We use `I' to indicate initialization and `D' to indicate
3003 function_key = constructor_p ? 'I' : 'D';
3005 /* We emit the function lazily, to avoid generating empty
3006 global constructors and destructors. */
3009 /* For Objective-C++, we may need to initialize metadata found in this module.
3010 This must be done _before_ any other static initializations. */
3011 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3012 && constructor_p && objc_static_init_needed_p ())
3014 body = start_objects (function_key, priority);
3015 objc_generate_static_init_call (NULL_TREE);
3018 /* Call the static storage duration function with appropriate
3020 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3022 /* Calls to pure or const functions will expand to nothing. */
3023 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3026 body = start_objects (function_key, priority);
3028 arguments = tree_cons (NULL_TREE,
3029 build_int_cst (NULL_TREE, priority),
3031 arguments = tree_cons (NULL_TREE,
3032 build_int_cst (NULL_TREE, constructor_p),
3034 finish_expr_stmt (build_function_call (fndecl, arguments));
3038 /* Close out the function. */
3040 finish_objects (function_key, priority, body);
3043 /* Generate constructor and destructor functions for the priority
3047 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3049 location_t *locus = (location_t *) data;
3050 int priority = (int) n->key;
3051 priority_info pi = (priority_info) n->value;
3053 /* Generate the functions themselves, but only if they are really
3055 if (pi->initializations_p)
3056 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3057 if (pi->destructions_p)
3058 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3060 /* Keep iterating. */
3064 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3065 decls referenced from front-end specific constructs; it will be called
3066 only for language-specific tree nodes.
3068 Here we must deal with member pointers. */
3071 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3075 switch (TREE_CODE (t))
3078 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3079 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3082 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3083 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3086 if (DECL_VTABLE_OR_VTT_P (t))
3088 /* The ABI requires that all virtual tables be emitted
3089 whenever one of them is. */
3091 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3093 vtbl = TREE_CHAIN (vtbl))
3094 mark_decl_referenced (vtbl);
3096 else if (DECL_CONTEXT (t)
3097 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3098 /* If we need a static variable in a function, then we
3099 need the containing function. */
3100 mark_decl_referenced (DECL_CONTEXT (t));
3109 /* Java requires that we be able to reference a local address for a
3110 method, and not be confused by PLT entries. If hidden aliases are
3111 supported, emit one for each java function that we've emitted. */
3114 build_java_method_aliases (void)
3116 struct cgraph_node *node;
3118 #ifndef HAVE_GAS_HIDDEN
3122 for (node = cgraph_nodes; node ; node = node->next)
3124 tree fndecl = node->decl;
3126 if (TREE_ASM_WRITTEN (fndecl)
3127 && DECL_CONTEXT (fndecl)
3128 && TYPE_P (DECL_CONTEXT (fndecl))
3129 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3130 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3132 /* Mangle the name in a predictable way; we need to reference
3133 this from a java compiled object file. */
3134 tree oid, nid, alias;
3138 oid = DECL_ASSEMBLER_NAME (fndecl);
3139 oname = IDENTIFIER_POINTER (oid);
3140 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3141 nname = ACONCAT (("_ZGA", oname+2, NULL));
3142 nid = get_identifier (nname);
3144 alias = make_alias_for (fndecl, nid);
3145 TREE_PUBLIC (alias) = 1;
3146 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3148 assemble_alias (alias, oid);
3153 /* This routine is called at the end of compilation.
3154 Its job is to create all the code needed to initialize and
3155 destroy the global aggregates. We do the destruction
3156 first, since that way we only need to reverse the decls once. */
3159 cp_write_global_declarations (void)
3165 unsigned ssdf_count = 0;
3169 locus = input_location;
3172 /* Bad parse errors. Just forget about it. */
3173 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3177 c_common_write_pch ();
3179 /* FIXME - huh? was input_line -= 1;*/
3181 /* We now have to write out all the stuff we put off writing out.
3184 o Template specializations that we have not yet instantiated,
3185 but which are needed.
3186 o Initialization and destruction for non-local objects with
3187 static storage duration. (Local objects with static storage
3188 duration are initialized when their scope is first entered,
3189 and are cleaned up via atexit.)
3190 o Virtual function tables.
3192 All of these may cause others to be needed. For example,
3193 instantiating one function may cause another to be needed, and
3194 generating the initializer for an object may cause templates to be
3195 instantiated, etc., etc. */
3197 timevar_push (TV_VARCONST);
3199 emit_support_tinfos ();
3208 /* If there are templates that we've put off instantiating, do
3210 instantiate_pending_templates (retries);
3213 /* Write out virtual tables as required. Note that writing out
3214 the virtual table for a template class may cause the
3215 instantiation of members of that class. If we write out
3216 vtables then we remove the class from our list so we don't
3217 have to look at it again. */
3219 while (keyed_classes != NULL_TREE
3220 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3223 keyed_classes = TREE_CHAIN (keyed_classes);
3229 tree next = TREE_CHAIN (t);
3233 if (maybe_emit_vtables (TREE_VALUE (next)))
3236 TREE_CHAIN (t) = TREE_CHAIN (next);
3241 next = TREE_CHAIN (t);
3245 /* Write out needed type info variables. We have to be careful
3246 looping through unemitted decls, because emit_tinfo_decl may
3247 cause other variables to be needed. New elements will be
3248 appended, and we remove from the vector those that actually
3250 for (i = VEC_length (tree, unemitted_tinfo_decls);
3251 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3252 if (emit_tinfo_decl (t))
3255 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3258 /* The list of objects with static storage duration is built up
3259 in reverse order. We clear STATIC_AGGREGATES so that any new
3260 aggregates added during the initialization of these will be
3261 initialized in the correct order when we next come around the
3263 vars = prune_vars_needing_no_initialization (&static_aggregates);
3267 /* We need to start a new initialization function each time
3268 through the loop. That's because we need to know which
3269 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3270 isn't computed until a function is finished, and written
3271 out. That's a deficiency in the back end. When this is
3272 fixed, these initialization functions could all become
3273 inline, with resulting performance improvements. */
3276 /* Set the line and file, so that it is obviously not from
3278 input_location = locus;
3279 ssdf_body = start_static_storage_duration_function (ssdf_count);
3281 /* Make sure the back end knows about all the variables. */
3282 write_out_vars (vars);
3284 /* First generate code to do all the initializations. */
3286 do_static_initialization_or_destruction (vars, /*initp=*/true);
3288 /* Then, generate code to do all the destructions. Do these
3289 in reverse order so that the most recently constructed
3290 variable is the first destroyed. If we're using
3291 __cxa_atexit, then we don't need to do this; functions
3292 were registered at initialization time to destroy the
3294 if (!flag_use_cxa_atexit && vars)
3296 vars = nreverse (vars);
3297 do_static_initialization_or_destruction (vars, /*initp=*/false);
3302 /* Finish up the static storage duration function for this
3304 input_location = locus;
3305 finish_static_storage_duration_function (ssdf_body);
3307 /* All those initializations and finalizations might cause
3308 us to need more inline functions, more template
3309 instantiations, etc. */
3312 /* ??? was: locus.line++; */
3315 /* Go through the set of inline functions whose bodies have not
3316 been emitted yet. If out-of-line copies of these functions
3317 are required, emit them. */
3318 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3320 /* Does it need synthesizing? */
3321 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3322 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3324 /* Even though we're already at the top-level, we push
3325 there again. That way, when we pop back a few lines
3326 hence, all of our state is restored. Otherwise,
3327 finish_function doesn't clean things up, and we end
3328 up with CURRENT_FUNCTION_DECL set. */
3329 push_to_top_level ();
3330 /* The decl's location will mark where it was first
3331 needed. Save that so synthesize method can indicate
3332 where it was needed from, in case of error */
3333 input_location = DECL_SOURCE_LOCATION (decl);
3334 synthesize_method (decl);
3335 pop_from_top_level ();
3339 if (!DECL_SAVED_TREE (decl))
3342 /* We lie to the back end, pretending that some functions
3343 are not defined when they really are. This keeps these
3344 functions from being put out unnecessarily. But, we must
3345 stop lying when the functions are referenced, or if they
3346 are not comdat since they need to be put out now. If
3347 DECL_INTERFACE_KNOWN, then we have already set
3348 DECL_EXTERNAL appropriately, so there's no need to check
3349 again, and we do not want to clear DECL_EXTERNAL if a
3350 previous call to import_export_decl set it.
3352 This is done in a separate for cycle, because if some
3353 deferred function is contained in another deferred
3354 function later in deferred_fns varray,
3355 rest_of_compilation would skip this function and we
3356 really cannot expand the same function twice. */
3357 import_export_decl (decl);
3358 if (DECL_NOT_REALLY_EXTERN (decl)
3359 && DECL_INITIAL (decl)
3360 && decl_needed_p (decl))
3361 DECL_EXTERNAL (decl) = 0;
3363 /* If we're going to need to write this function out, and
3364 there's already a body for it, create RTL for it now.
3365 (There might be no body if this is a method we haven't
3366 gotten around to synthesizing yet.) */
3367 if (!DECL_EXTERNAL (decl)
3368 && decl_needed_p (decl)
3369 && !TREE_ASM_WRITTEN (decl)
3370 && !cgraph_node (decl)->local.finalized)
3372 /* We will output the function; no longer consider it in this
3374 DECL_DEFER_OUTPUT (decl) = 0;
3375 /* Generate RTL for this function now that we know we
3377 expand_or_defer_fn (decl);
3378 /* If we're compiling -fsyntax-only pretend that this
3379 function has been written out so that we don't try to
3381 if (flag_syntax_only)
3382 TREE_ASM_WRITTEN (decl) = 1;
3387 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3390 /* Static data members are just like namespace-scope globals. */
3391 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3393 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3394 /* Don't write it out if we haven't seen a definition. */
3395 || DECL_IN_AGGR_P (decl))
3397 import_export_decl (decl);
3398 /* If this static data member is needed, provide it to the
3400 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3401 DECL_EXTERNAL (decl) = 0;
3403 if (VEC_length (tree, pending_statics) != 0
3404 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3405 VEC_length (tree, pending_statics)))
3412 /* All used inline functions must have a definition at this point. */
3413 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3415 if (/* Check online inline functions that were actually used. */
3416 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3417 /* If the definition actually was available here, then the
3418 fact that the function was not defined merely represents
3419 that for some reason (use of a template repository,
3420 #pragma interface, etc.) we decided not to emit the
3422 && !DECL_INITIAL (decl)
3423 /* An explicit instantiation can be used to specify
3424 that the body is in another unit. It will have
3425 already verified there was a definition. */
3426 && !DECL_EXPLICIT_INSTANTIATION (decl))
3428 warning (0, "inline function %q+D used but never defined", decl);
3429 /* Avoid a duplicate warning from check_global_declaration_1. */
3430 TREE_NO_WARNING (decl) = 1;
3434 /* We give C linkage to static constructors and destructors. */
3435 push_lang_context (lang_name_c);
3437 /* Generate initialization and destruction functions for all
3438 priorities for which they are required. */
3439 if (priority_info_map)
3440 splay_tree_foreach (priority_info_map,
3441 generate_ctor_and_dtor_functions_for_priority,
3443 else if (c_dialect_objc () && objc_static_init_needed_p ())
3444 /* If this is obj-c++ and we need a static init, call
3445 generate_ctor_or_dtor_function. */
3446 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3447 DEFAULT_INIT_PRIORITY, &locus);
3449 /* We're done with the splay-tree now. */
3450 if (priority_info_map)
3451 splay_tree_delete (priority_info_map);
3453 /* Generate any missing aliases. */
3454 maybe_apply_pending_pragma_weaks ();
3456 /* We're done with static constructors, so we can go back to "C++"
3458 pop_lang_context ();
3460 cgraph_finalize_compilation_unit ();
3463 /* Now, issue warnings about static, but not defined, functions,
3464 etc., and emit debugging information. */
3465 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3466 if (VEC_length (tree, pending_statics) != 0)
3468 check_global_declarations (VEC_address (tree, pending_statics),
3469 VEC_length (tree, pending_statics));
3470 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3471 VEC_length (tree, pending_statics));
3474 /* Generate hidden aliases for Java. */
3475 build_java_method_aliases ();
3479 /* The entire file is now complete. If requested, dump everything
3483 FILE *stream = dump_begin (TDI_tu, &flags);
3487 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3488 dump_end (TDI_tu, stream);
3492 timevar_pop (TV_VARCONST);
3494 if (flag_detailed_statistics)
3496 dump_tree_statistics ();
3497 dump_time_statistics ();
3499 input_location = locus;
3501 #ifdef ENABLE_CHECKING
3502 validate_conversion_obstack ();
3503 #endif /* ENABLE_CHECKING */
3506 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3507 function to call in parse-tree form; it has not yet been
3508 semantically analyzed. ARGS are the arguments to the function.
3509 They have already been semantically analyzed. */
3512 build_offset_ref_call_from_tree (tree fn, tree args)
3521 object = TREE_OPERAND (fn, 0);
3523 if (processing_template_decl)
3525 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3526 || TREE_CODE (fn) == MEMBER_REF);
3527 if (type_dependent_expression_p (fn)
3528 || any_type_dependent_arguments_p (args))
3529 return build_nt_call_list (fn, args);
3531 /* Transform the arguments and add the implicit "this"
3532 parameter. That must be done before the FN is transformed
3533 because we depend on the form of FN. */
3534 args = build_non_dependent_args (args);
3535 object = build_non_dependent_expr (object);
3536 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3537 object = build_unary_op (ADDR_EXPR, object, 0);
3538 args = tree_cons (NULL_TREE, object, args);
3539 /* Now that the arguments are done, transform FN. */
3540 fn = build_non_dependent_expr (fn);
3543 /* A qualified name corresponding to a bound pointer-to-member is
3544 represented as an OFFSET_REF:
3546 struct B { void g(); };
3548 void B::g() { (this->*p)(); } */
3549 if (TREE_CODE (fn) == OFFSET_REF)
3551 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3552 fn = TREE_OPERAND (fn, 1);
3553 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3554 args = tree_cons (NULL_TREE, object_addr, args);
3557 expr = build_function_call (fn, args);
3558 if (processing_template_decl && expr != error_mark_node)
3559 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3565 check_default_args (tree x)
3567 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3568 bool saw_def = false;
3569 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3570 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3572 if (TREE_PURPOSE (arg))
3576 error ("default argument missing for parameter %P of %q+#D", i, x);
3577 TREE_PURPOSE (arg) = error_mark_node;
3582 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3583 If DECL is a specialization or implicitly declared class member,
3584 generate the actual definition. */
3587 mark_used (tree decl)
3589 HOST_WIDE_INT saved_processing_template_decl = 0;
3591 /* If DECL is a BASELINK for a single function, then treat it just
3592 like the DECL for the function. Otherwise, if the BASELINK is
3593 for an overloaded function, we don't know which function was
3594 actually used until after overload resolution. */
3595 if (TREE_CODE (decl) == BASELINK)
3597 decl = BASELINK_FUNCTIONS (decl);
3598 if (really_overloaded_fn (decl))
3600 decl = OVL_CURRENT (decl);
3603 TREE_USED (decl) = 1;
3604 if (DECL_CLONED_FUNCTION_P (decl))
3605 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3606 /* If we don't need a value, then we don't need to synthesize DECL. */
3607 if (skip_evaluation)
3609 /* Normally, we can wait until instantiation-time to synthesize
3610 DECL. However, if DECL is a static data member initialized with
3611 a constant, we need the value right now because a reference to
3612 such a data member is not value-dependent. */
3613 if (TREE_CODE (decl) == VAR_DECL
3614 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3615 && DECL_CLASS_SCOPE_P (decl))
3617 /* Don't try to instantiate members of dependent types. We
3618 cannot just use dependent_type_p here because this function
3619 may be called from fold_non_dependent_expr, and then we may
3620 see dependent types, even though processing_template_decl
3622 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3623 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3625 /* Pretend that we are not in a template, even if we are, so
3626 that the static data member initializer will be processed. */
3627 saved_processing_template_decl = processing_template_decl;
3628 processing_template_decl = 0;
3631 if (processing_template_decl)
3634 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3635 && !TREE_ASM_WRITTEN (decl))
3636 /* Remember it, so we can check it was defined. */
3638 if (DECL_DEFERRED_FN (decl))
3641 /* Remember the current location for a function we will end up
3642 synthesizing. Then we can inform the user where it was
3643 required in the case of error. */
3644 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3645 && !DECL_THUNK_P (decl))
3646 DECL_SOURCE_LOCATION (decl) = input_location;
3648 note_vague_linkage_fn (decl);
3651 assemble_external (decl);
3653 /* Is it a synthesized method that needs to be synthesized? */
3654 if (TREE_CODE (decl) == FUNCTION_DECL
3655 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3656 && DECL_ARTIFICIAL (decl)
3657 && !DECL_THUNK_P (decl)
3658 && ! DECL_INITIAL (decl)
3659 /* Kludge: don't synthesize for default args. Unfortunately this
3660 rules out initializers of namespace-scoped objects too, but
3661 it's sort-of ok if the implicit ctor or dtor decl keeps
3662 pointing to the class location. */
3663 && current_function_decl)
3665 synthesize_method (decl);
3666 /* If we've already synthesized the method we don't need to
3667 do the instantiation test below. */
3669 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3670 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3671 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3672 || (TREE_CODE (decl) == FUNCTION_DECL
3673 && DECL_INLINE (DECL_TEMPLATE_RESULT
3674 (template_for_substitution (decl))))
3675 /* We need to instantiate static data members so that there
3676 initializers are available in integral constant
3678 || (TREE_CODE (decl) == VAR_DECL
3679 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3680 /* If this is a function or variable that is an instance of some
3681 template, we now know that we will need to actually do the
3682 instantiation. We check that DECL is not an explicit
3683 instantiation because that is not checked in instantiate_decl.
3685 We put off instantiating functions in order to improve compile
3686 times. Maintaining a stack of active functions is expensive,
3687 and the inliner knows to instantiate any functions it might
3688 need. Therefore, we always try to defer instantiation. */
3689 instantiate_decl (decl, /*defer_ok=*/true,
3690 /*expl_inst_class_mem_p=*/false);
3692 processing_template_decl = saved_processing_template_decl;
3695 #include "gt-cp-decl2.h"