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 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 2, 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 COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
55 extern cpp_reader *parse_in;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s {
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree);
69 static bool maybe_emit_vtables (tree);
70 static bool acceptable_java_type (tree);
71 static tree start_objects (int, int);
72 static void finish_objects (int, int, tree);
73 static tree start_static_storage_duration_function (unsigned);
74 static void finish_static_storage_duration_function (tree);
75 static priority_info get_priority_info (int);
76 static void do_static_initialization (tree, tree);
77 static void do_static_destruction (tree);
78 static tree start_static_initialization_or_destruction (tree, int);
79 static void finish_static_initialization_or_destruction (tree);
80 static void generate_ctor_or_dtor_function (bool, int, location_t *);
81 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
83 static tree prune_vars_needing_no_initialization (tree *);
84 static void write_out_vars (tree);
85 static void import_export_class (tree);
86 static tree get_guard_bits (tree);
88 /* A list of static class variables. This is needed, because a
89 static class variable can be declared inside the class without
90 an initializer, and then initialized, statically, outside the class. */
91 static GTY(()) VEC(tree,gc) *pending_statics;
93 /* A list of functions which were declared inline, but which we
94 may need to emit outline anyway. */
95 static GTY(()) VEC(tree,gc) *deferred_fns;
97 /* Nonzero if we're done parsing and into end-of-file activities. */
101 /* Functions called along with real static constructors and destructors. */
107 /* Incorporate `const' and `volatile' qualifiers for member functions.
108 FUNCTION is a TYPE_DECL or a FUNCTION_DECL.
109 QUALS is a list of qualifiers. Returns any explicit
110 top-level qualifiers of the method's this pointer, anything other than
111 TYPE_UNQUALIFIED will be an extension. */
114 grok_method_quals (tree ctype, tree function, cp_cv_quals quals)
116 tree fntype = TREE_TYPE (function);
117 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
118 int type_quals = TYPE_UNQUALIFIED;
119 int this_quals = TYPE_UNQUALIFIED;
121 type_quals = quals & ~TYPE_QUAL_RESTRICT;
122 this_quals = quals & TYPE_QUAL_RESTRICT;
124 ctype = cp_build_qualified_type (ctype, type_quals);
125 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
126 (TREE_CODE (fntype) == METHOD_TYPE
127 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
128 : TYPE_ARG_TYPES (fntype)));
130 fntype = build_exception_variant (fntype, raises);
132 TREE_TYPE (function) = fntype;
136 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
140 cp_build_parm_decl (tree name, tree type)
142 tree parm = build_decl (PARM_DECL, name, type);
143 /* DECL_ARG_TYPE is only used by the back end and the back end never
145 if (!processing_template_decl)
146 DECL_ARG_TYPE (parm) = type_passed_as (type);
150 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
154 build_artificial_parm (tree name, tree type)
156 tree parm = cp_build_parm_decl (name, type);
157 DECL_ARTIFICIAL (parm) = 1;
158 /* All our artificial parms are implicitly `const'; they cannot be
160 TREE_READONLY (parm) = 1;
164 /* Constructors for types with virtual baseclasses need an "in-charge" flag
165 saying whether this constructor is responsible for initialization of
166 virtual baseclasses or not. All destructors also need this "in-charge"
167 flag, which additionally determines whether or not the destructor should
168 free the memory for the object.
170 This function adds the "in-charge" flag to member function FN if
171 appropriate. It is called from grokclassfn and tsubst.
172 FN must be either a constructor or destructor.
174 The in-charge flag follows the 'this' parameter, and is followed by the
175 VTT parm (if any), then the user-written parms. */
178 maybe_retrofit_in_chrg (tree fn)
180 tree basetype, arg_types, parms, parm, fntype;
182 /* If we've already add the in-charge parameter don't do it again. */
183 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
186 /* When processing templates we can't know, in general, whether or
187 not we're going to have virtual baseclasses. */
188 if (processing_template_decl)
191 /* We don't need an in-charge parameter for constructors that don't
192 have virtual bases. */
193 if (DECL_CONSTRUCTOR_P (fn)
194 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
197 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
198 basetype = TREE_TYPE (TREE_VALUE (arg_types));
199 arg_types = TREE_CHAIN (arg_types);
201 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
203 /* If this is a subobject constructor or destructor, our caller will
204 pass us a pointer to our VTT. */
205 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
207 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
209 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
210 TREE_CHAIN (parm) = parms;
213 /* ...and then to TYPE_ARG_TYPES. */
214 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
216 DECL_HAS_VTT_PARM_P (fn) = 1;
219 /* Then add the in-charge parm (before the VTT parm). */
220 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
221 TREE_CHAIN (parm) = parms;
223 arg_types = hash_tree_chain (integer_type_node, arg_types);
225 /* Insert our new parameter(s) into the list. */
226 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
228 /* And rebuild the function type. */
229 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
231 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
232 fntype = build_exception_variant (fntype,
233 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
234 TREE_TYPE (fn) = fntype;
236 /* Now we've got the in-charge parameter. */
237 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
240 /* Classes overload their constituent function names automatically.
241 When a function name is declared in a record structure,
242 its name is changed to it overloaded name. Since names for
243 constructors and destructors can conflict, we place a leading
246 CNAME is the name of the class we are grokking for.
248 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
250 FLAGS contains bits saying what's special about today's
251 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
253 If FUNCTION is a destructor, then we must add the `auto-delete' field
254 as a second parameter. There is some hair associated with the fact
255 that we must "declare" this variable in the manner consistent with the
256 way the rest of the arguments were declared.
258 QUALS are the qualifiers for the this pointer. */
261 grokclassfn (tree ctype, tree function, enum overload_flags flags,
264 tree fn_name = DECL_NAME (function);
265 cp_cv_quals this_quals = TYPE_UNQUALIFIED;
267 /* Even within an `extern "C"' block, members get C++ linkage. See
268 [dcl.link] for details. */
269 SET_DECL_LANGUAGE (function, lang_cplusplus);
271 if (fn_name == NULL_TREE)
273 error ("name missing for member function");
274 fn_name = get_identifier ("<anonymous>");
275 DECL_NAME (function) = fn_name;
279 this_quals = grok_method_quals (ctype, function, quals);
281 if (TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
283 /* Must add the class instance variable up front. */
284 /* Right now we just make this a pointer. But later
285 we may wish to make it special. */
286 tree type = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (function)));
290 /* The `this' parameter is implicitly `const'; it cannot be
292 this_quals |= TYPE_QUAL_CONST;
293 qual_type = cp_build_qualified_type (type, this_quals);
294 parm = build_artificial_parm (this_identifier, qual_type);
295 cp_apply_type_quals_to_decl (this_quals, parm);
296 TREE_CHAIN (parm) = DECL_ARGUMENTS (function);
297 DECL_ARGUMENTS (function) = parm;
300 DECL_CONTEXT (function) = ctype;
302 if (flags == DTOR_FLAG)
303 DECL_DESTRUCTOR_P (function) = 1;
305 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
306 maybe_retrofit_in_chrg (function);
309 /* Create an ARRAY_REF, checking for the user doing things backwards
313 grok_array_decl (tree array_expr, tree index_exp)
317 tree orig_array_expr = array_expr;
318 tree orig_index_exp = index_exp;
320 if (error_operand_p (array_expr) || error_operand_p (index_exp))
321 return error_mark_node;
323 if (processing_template_decl)
325 if (type_dependent_expression_p (array_expr)
326 || type_dependent_expression_p (index_exp))
327 return build_min_nt (ARRAY_REF, array_expr, index_exp,
328 NULL_TREE, NULL_TREE);
329 array_expr = build_non_dependent_expr (array_expr);
330 index_exp = build_non_dependent_expr (index_exp);
333 type = TREE_TYPE (array_expr);
335 type = non_reference (type);
337 /* If they have an `operator[]', use that. */
338 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
339 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
340 array_expr, index_exp, NULL_TREE,
341 /*overloaded_p=*/NULL);
346 /* Otherwise, create an ARRAY_REF for a pointer or array type.
347 It is a little-known fact that, if `a' is an array and `i' is
348 an int, you can write `i[a]', which means the same thing as
350 if (TREE_CODE (type) == ARRAY_TYPE)
353 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
355 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
358 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
360 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
362 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
365 if ((p1 && i2) && (i1 && p2))
366 error ("ambiguous conversion for array subscript");
369 array_expr = p1, index_exp = i2;
371 array_expr = p2, index_exp = i1;
374 error ("invalid types %<%T[%T]%> for array subscript",
375 type, TREE_TYPE (index_exp));
376 return error_mark_node;
379 if (array_expr == error_mark_node || index_exp == error_mark_node)
380 error ("ambiguous conversion for array subscript");
382 expr = build_array_ref (array_expr, index_exp);
384 if (processing_template_decl && expr != error_mark_node)
385 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
386 NULL_TREE, NULL_TREE);
390 /* Given the cast expression EXP, checking out its validity. Either return
391 an error_mark_node if there was an unavoidable error, return a cast to
392 void for trying to delete a pointer w/ the value 0, or return the
393 call to delete. If DOING_VEC is true, we handle things differently
394 for doing an array delete.
395 Implements ARM $5.3.4. This is called from the parser. */
398 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
402 if (exp == error_mark_node)
405 if (processing_template_decl)
407 t = build_min (DELETE_EXPR, void_type_node, exp, size);
408 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
409 DELETE_EXPR_USE_VEC (t) = doing_vec;
410 TREE_SIDE_EFFECTS (t) = 1;
414 /* An array can't have been allocated by new, so complain. */
415 if (TREE_CODE (exp) == VAR_DECL
416 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
417 warning (0, "deleting array %q#D", exp);
419 t = build_expr_type_conversion (WANT_POINTER, exp, true);
421 if (t == NULL_TREE || t == error_mark_node)
423 error ("type %q#T argument given to %<delete%>, expected pointer",
425 return error_mark_node;
428 type = TREE_TYPE (t);
430 /* As of Valley Forge, you can delete a pointer to const. */
432 /* You can't delete functions. */
433 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
435 error ("cannot delete a function. Only pointer-to-objects are "
436 "valid arguments to %<delete%>");
437 return error_mark_node;
440 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
441 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
443 warning (0, "deleting %qT is undefined", type);
447 /* Deleting a pointer with the value zero is valid and has no effect. */
448 if (integer_zerop (t))
449 return build1 (NOP_EXPR, void_type_node, t);
452 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
453 sfk_deleting_destructor,
456 return build_delete (type, t, sfk_deleting_destructor,
457 LOOKUP_NORMAL, use_global_delete);
460 /* Report an error if the indicated template declaration is not the
461 sort of thing that should be a member template. */
464 check_member_template (tree tmpl)
468 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
469 decl = DECL_TEMPLATE_RESULT (tmpl);
471 if (TREE_CODE (decl) == FUNCTION_DECL
472 || (TREE_CODE (decl) == TYPE_DECL
473 && IS_AGGR_TYPE (TREE_TYPE (decl))))
475 if (current_function_decl)
476 /* 14.5.2.2 [temp.mem]
478 A local class shall not have member templates. */
479 error ("invalid declaration of member template %q#D in local class",
482 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VIRTUAL_P (decl))
484 /* 14.5.2.3 [temp.mem]
486 A member function template shall not be virtual. */
488 ("invalid use of %<virtual%> in template declaration of %q#D",
490 DECL_VIRTUAL_P (decl) = 0;
493 /* The debug-information generating code doesn't know what to do
494 with member templates. */
495 DECL_IGNORED_P (tmpl) = 1;
498 error ("template declaration of %q#D", decl);
501 /* Return true iff TYPE is a valid Java parameter or return type. */
504 acceptable_java_type (tree type)
506 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
508 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
510 type = TREE_TYPE (type);
511 if (TREE_CODE (type) == RECORD_TYPE)
514 if (! TYPE_FOR_JAVA (type))
516 if (! CLASSTYPE_TEMPLATE_INFO (type))
518 args = CLASSTYPE_TI_ARGS (type);
519 i = TREE_VEC_LENGTH (args);
522 type = TREE_VEC_ELT (args, i);
523 if (TREE_CODE (type) == POINTER_TYPE)
524 type = TREE_TYPE (type);
525 if (! TYPE_FOR_JAVA (type))
534 /* For a METHOD in a Java class CTYPE, return true if
535 the parameter and return types are valid Java types.
536 Otherwise, print appropriate error messages, and return false. */
539 check_java_method (tree method)
542 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
543 tree ret_type = TREE_TYPE (TREE_TYPE (method));
545 if (!acceptable_java_type (ret_type))
547 error ("Java method %qD has non-Java return type %qT",
552 arg_types = TREE_CHAIN (arg_types);
553 if (DECL_HAS_IN_CHARGE_PARM_P (method))
554 arg_types = TREE_CHAIN (arg_types);
555 if (DECL_HAS_VTT_PARM_P (method))
556 arg_types = TREE_CHAIN (arg_types);
558 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
560 tree type = TREE_VALUE (arg_types);
561 if (!acceptable_java_type (type))
563 error ("Java method %qD has non-Java parameter type %qT",
571 /* Sanity check: report error if this function FUNCTION is not
572 really a member of the class (CTYPE) it is supposed to belong to.
573 TEMPLATE_PARMS is used to specify the template parameters of a member
574 template passed as FUNCTION_DECL. If the member template is passed as a
575 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
576 from the declaration. If the function is not a function template, it
578 It returns the original declaration for the function, or NULL_TREE
579 if no declaration was found (and an error was emitted). */
582 check_classfn (tree ctype, tree function, tree template_parms)
587 if (DECL_USE_TEMPLATE (function)
588 && !(TREE_CODE (function) == TEMPLATE_DECL
589 && DECL_TEMPLATE_SPECIALIZATION (function))
590 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
591 /* Since this is a specialization of a member template,
592 we're not going to find the declaration in the class.
595 struct S { template <typename T> void f(T); };
596 template <> void S::f(int);
598 we're not going to find `S::f(int)', but there's no
599 reason we should, either. We let our callers know we didn't
600 find the method, but we don't complain. */
603 /* Basic sanity check: for a template function, the template parameters
604 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
605 if (TREE_CODE (function) == TEMPLATE_DECL)
607 gcc_assert (!template_parms
608 || comp_template_parms (template_parms,
609 DECL_TEMPLATE_PARMS (function)));
610 template_parms = DECL_TEMPLATE_PARMS (function);
613 /* OK, is this a definition of a member template? */
614 is_template = (template_parms != NULL_TREE);
616 ix = class_method_index_for_fn (complete_type (ctype), function);
619 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
620 tree fndecls, fndecl = 0;
623 const char *format = NULL;
625 pushed_scope = push_scope (ctype);
626 for (fndecls = VEC_index (tree, methods, ix);
627 fndecls; fndecls = OVL_NEXT (fndecls))
631 fndecl = OVL_CURRENT (fndecls);
632 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
633 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
635 /* We cannot simply call decls_match because this doesn't
636 work for static member functions that are pretending to
637 be methods, and because the name may have been changed by
640 /* Get rid of the this parameter on functions that become
642 if (DECL_STATIC_FUNCTION_P (fndecl)
643 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
644 p1 = TREE_CHAIN (p1);
646 /* A member template definition only matches a member template
648 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
651 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
652 TREE_TYPE (TREE_TYPE (fndecl)))
653 && compparms (p1, p2)
655 || comp_template_parms (template_parms,
656 DECL_TEMPLATE_PARMS (fndecl)))
657 && (DECL_TEMPLATE_SPECIALIZATION (function)
658 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
659 && (!DECL_TEMPLATE_SPECIALIZATION (function)
660 || (DECL_TI_TEMPLATE (function)
661 == DECL_TI_TEMPLATE (fndecl))))
665 pop_scope (pushed_scope);
667 return OVL_CURRENT (fndecls);
668 error ("prototype for %q#D does not match any in class %qT",
670 is_conv_op = DECL_CONV_FN_P (fndecl);
673 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
674 fndecls = VEC_index (tree, methods, ix);
677 fndecl = OVL_CURRENT (fndecls);
678 fndecls = OVL_NEXT (fndecls);
680 if (!fndecls && is_conv_op)
682 if (VEC_length (tree, methods) > (size_t) ++ix)
684 fndecls = VEC_index (tree, methods, ix);
685 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
697 format = N_("candidates are: %+#D");
699 format = N_("candidate is: %+#D");
700 error (format, fndecl);
703 else if (!COMPLETE_TYPE_P (ctype))
704 cxx_incomplete_type_error (function, ctype);
706 error ("no %q#D member function declared in class %qT",
709 /* If we did not find the method in the class, add it to avoid
710 spurious errors (unless the CTYPE is not yet defined, in which
711 case we'll only confuse ourselves when the function is declared
712 properly within the class. */
713 if (COMPLETE_TYPE_P (ctype))
714 add_method (ctype, function, NULL_TREE);
718 /* DECL is a function with vague linkage. Remember it so that at the
719 end of the translation unit we can decide whether or not to emit
723 note_vague_linkage_fn (tree decl)
725 if (!DECL_DEFERRED_FN (decl))
727 DECL_DEFERRED_FN (decl) = 1;
728 DECL_DEFER_OUTPUT (decl) = 1;
729 VEC_safe_push (tree, gc, deferred_fns, decl);
733 /* Like note_vague_linkage_fn but for variables. */
736 note_vague_linkage_var (tree var)
738 VEC_safe_push (tree, gc, pending_statics, var);
741 /* We have just processed the DECL, which is a static data member.
742 Its initializer, if present, is INIT. The ASMSPEC_TREE, if
743 present, is the assembly-language name for the data member.
744 FLAGS is as for cp_finish_decl. */
747 finish_static_data_member_decl (tree decl, tree init, tree asmspec_tree,
750 gcc_assert (TREE_PUBLIC (decl));
752 DECL_CONTEXT (decl) = current_class_type;
754 /* We cannot call pushdecl here, because that would fill in the
755 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
756 the right thing, namely, to put this decl out straight away. */
757 /* current_class_type can be NULL_TREE in case of error. */
758 if (!asmspec_tree && current_class_type)
759 DECL_INITIAL (decl) = error_mark_node;
761 if (! processing_template_decl)
762 note_vague_linkage_var (decl);
764 if (LOCAL_CLASS_P (current_class_type))
765 pedwarn ("local class %q#T shall not have static data member %q#D",
766 current_class_type, decl);
768 /* Static consts need not be initialized in the class definition. */
769 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
771 static int explained = 0;
773 error ("initializer invalid for static member with constructor");
776 error ("(an out of class initialization is required)");
781 /* Force the compiler to know when an uninitialized static const
782 member is being used. */
783 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
784 TREE_USED (decl) = 1;
785 DECL_INITIAL (decl) = init;
786 DECL_IN_AGGR_P (decl) = 1;
788 cp_finish_decl (decl, init, asmspec_tree, flags);
791 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
792 of a structure component, returning a _DECL node.
793 QUALS is a list of type qualifiers for this decl (such as for declaring
794 const member functions).
796 This is done during the parsing of the struct declaration.
797 The _DECL nodes are chained together and the lot of them
798 are ultimately passed to `build_struct' to make the RECORD_TYPE node.
800 If class A defines that certain functions in class B are friends, then
801 the way I have set things up, it is B who is interested in permission
802 granted by A. However, it is in A's context that these declarations
803 are parsed. By returning a void_type_node, class A does not attempt
804 to incorporate the declarations of the friends within its structure.
806 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
807 CHANGES TO CODE IN `start_method'. */
810 grokfield (const cp_declarator *declarator,
811 cp_decl_specifier_seq *declspecs,
812 tree init, tree asmspec_tree,
816 const char *asmspec = 0;
817 int flags = LOOKUP_ONLYCONVERTING;
819 if (!declspecs->any_specifiers_p
820 && declarator->kind == cdk_id
821 && declarator->u.id.qualifying_scope
822 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
823 /* Access declaration */
824 return do_class_using_decl (declarator->u.id.qualifying_scope,
825 declarator->u.id.unqualified_name);
828 && TREE_CODE (init) == TREE_LIST
829 && TREE_VALUE (init) == error_mark_node
830 && TREE_CHAIN (init) == NULL_TREE)
833 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
834 if (! value || error_operand_p (value))
835 /* friend or constructor went bad. */
836 return error_mark_node;
838 if (TREE_CODE (value) == TYPE_DECL && init)
840 error ("typedef %qD is initialized (use __typeof__ instead)", value);
844 /* Pass friendly classes back. */
845 if (value == void_type_node)
848 /* Pass friend decls back. */
849 if ((TREE_CODE (value) == FUNCTION_DECL
850 || TREE_CODE (value) == TEMPLATE_DECL)
851 && DECL_CONTEXT (value) != current_class_type)
854 if (DECL_NAME (value) != NULL_TREE
855 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
856 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
857 error ("member %qD conflicts with virtual function table field name",
860 /* Stash away type declarations. */
861 if (TREE_CODE (value) == TYPE_DECL)
863 DECL_NONLOCAL (value) = 1;
864 DECL_CONTEXT (value) = current_class_type;
866 if (processing_template_decl)
867 value = push_template_decl (value);
871 /* Avoid storing attributes in template parameters:
872 tsubst is not ready to handle them. */
873 tree type = TREE_TYPE (value);
874 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
875 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
876 sorry ("applying attributes to template parameters is not implemented");
878 cplus_decl_attributes (&value, attrlist, 0);
884 if (DECL_IN_AGGR_P (value))
886 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
887 return void_type_node;
891 asmspec = TREE_STRING_POINTER (asmspec_tree);
895 if (TREE_CODE (value) == FUNCTION_DECL)
897 /* Initializers for functions are rejected early in the parser.
898 If we get here, it must be a pure specifier for a method. */
899 gcc_assert (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE);
900 gcc_assert (error_operand_p (init) || integer_zerop (init));
901 DECL_PURE_VIRTUAL_P (value) = 1;
903 else if (pedantic && TREE_CODE (value) != VAR_DECL)
904 /* Already complained in grokdeclarator. */
908 /* We allow initializers to become parameters to base
910 if (TREE_CODE (init) == TREE_LIST)
912 if (TREE_CHAIN (init) == NULL_TREE)
913 init = TREE_VALUE (init);
915 init = digest_init (TREE_TYPE (value), init, (tree *)0);
918 if (!processing_template_decl)
920 if (TREE_CODE (init) == CONSTRUCTOR)
921 init = digest_init (TREE_TYPE (value), init, (tree *)0);
923 init = integral_constant_value (init);
925 if (init != error_mark_node && ! TREE_CONSTANT (init))
927 /* We can allow references to things that are effectively
928 static, since references are initialized with the
930 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
931 || (TREE_STATIC (init) == 0
932 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
934 error ("field initializer is not constant");
935 init = error_mark_node;
942 if (processing_template_decl
943 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
945 value = push_template_decl (value);
946 if (error_operand_p (value))
947 return error_mark_node;
951 cplus_decl_attributes (&value, attrlist, 0);
953 switch (TREE_CODE (value))
956 finish_static_data_member_decl (value, init, asmspec_tree,
962 error ("%<asm%> specifiers are not permitted on non-static data members");
963 if (DECL_INITIAL (value) == error_mark_node)
964 init = error_mark_node;
965 cp_finish_decl (value, init, NULL_TREE, flags);
966 DECL_INITIAL (value) = init;
967 DECL_IN_AGGR_P (value) = 1;
972 set_user_assembler_name (value, asmspec);
973 if (!DECL_FRIEND_P (value))
974 grok_special_member_properties (value);
976 cp_finish_decl (value, init, asmspec_tree, flags);
978 /* Pass friends back this way. */
979 if (DECL_FRIEND_P (value))
980 return void_type_node;
982 DECL_IN_AGGR_P (value) = 1;
991 /* Like `grokfield', but for bitfields.
992 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
995 grokbitfield (const cp_declarator *declarator,
996 cp_decl_specifier_seq *declspecs, tree width)
998 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
1000 if (! value) return NULL_TREE; /* friends went bad. */
1002 /* Pass friendly classes back. */
1003 if (TREE_CODE (value) == VOID_TYPE)
1004 return void_type_node;
1006 if (TREE_CODE (value) == TYPE_DECL)
1008 error ("cannot declare %qD to be a bit-field type", value);
1012 /* Usually, finish_struct_1 catches bitfields with invalid types.
1013 But, in the case of bitfields with function type, we confuse
1014 ourselves into thinking they are member functions, so we must
1016 if (TREE_CODE (value) == FUNCTION_DECL)
1018 error ("cannot declare bit-field %qD with function type",
1023 if (DECL_IN_AGGR_P (value))
1025 error ("%qD is already defined in the class %qT", value,
1026 DECL_CONTEXT (value));
1027 return void_type_node;
1030 if (TREE_STATIC (value))
1032 error ("static member %qD cannot be a bit-field", value);
1035 cp_finish_decl (value, NULL_TREE, NULL_TREE, 0);
1037 if (width != error_mark_node)
1039 constant_expression_warning (width);
1040 DECL_INITIAL (value) = width;
1041 SET_DECL_C_BIT_FIELD (value);
1044 DECL_IN_AGGR_P (value) = 1;
1050 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1052 if (*decl == NULL_TREE || *decl == void_type_node)
1055 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1056 decl = &DECL_TEMPLATE_RESULT (*decl);
1058 decl_attributes (decl, attributes, flags);
1060 if (TREE_CODE (*decl) == TYPE_DECL)
1061 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1064 /* Walks through the namespace- or function-scope anonymous union
1065 OBJECT, with the indicated TYPE, building appropriate ALIAS_DECLs.
1066 Returns one of the fields for use in the mangled name. */
1069 build_anon_union_vars (tree type, tree object)
1071 tree main_decl = NULL_TREE;
1074 /* Rather than write the code to handle the non-union case,
1075 just give an error. */
1076 if (TREE_CODE (type) != UNION_TYPE)
1077 error ("anonymous struct not inside named type");
1079 for (field = TYPE_FIELDS (type);
1081 field = TREE_CHAIN (field))
1086 if (DECL_ARTIFICIAL (field))
1088 if (TREE_CODE (field) != FIELD_DECL)
1090 pedwarn ("%q+#D invalid; an anonymous union can only "
1091 "have non-static data members", field);
1095 if (TREE_PRIVATE (field))
1096 pedwarn ("private member %q+#D in anonymous union", field);
1097 else if (TREE_PROTECTED (field))
1098 pedwarn ("protected member %q+#D in anonymous union", field);
1100 if (processing_template_decl)
1101 ref = build_min_nt (COMPONENT_REF, object,
1102 DECL_NAME (field), NULL_TREE);
1104 ref = build_class_member_access_expr (object, field, NULL_TREE,
1107 if (DECL_NAME (field))
1109 decl = build_decl (ALIAS_DECL, DECL_NAME (field), TREE_TYPE (field));
1110 DECL_INITIAL (decl) = ref;
1111 TREE_PUBLIC (decl) = 0;
1112 TREE_STATIC (decl) = 0;
1113 DECL_EXTERNAL (decl) = 1;
1114 decl = pushdecl (decl);
1116 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1117 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1121 if (main_decl == NULL_TREE)
1128 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1129 anonymous union, then all members must be laid out together. PUBLIC_P
1130 is nonzero if this union is not declared static. */
1133 finish_anon_union (tree anon_union_decl)
1139 if (anon_union_decl == error_mark_node)
1142 type = TREE_TYPE (anon_union_decl);
1143 public_p = TREE_PUBLIC (anon_union_decl);
1145 /* The VAR_DECL's context is the same as the TYPE's context. */
1146 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1148 if (TYPE_FIELDS (type) == NULL_TREE)
1153 error ("namespace-scope anonymous aggregates must be static");
1157 main_decl = build_anon_union_vars (type, anon_union_decl);
1158 if (main_decl == NULL_TREE)
1160 warning (0, "anonymous union with no members");
1164 if (!processing_template_decl)
1166 /* Use main_decl to set the mangled name. */
1167 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1168 mangle_decl (anon_union_decl);
1169 DECL_NAME (anon_union_decl) = NULL_TREE;
1172 pushdecl (anon_union_decl);
1173 if (building_stmt_tree ()
1174 && at_function_scope_p ())
1175 add_decl_expr (anon_union_decl);
1176 else if (!processing_template_decl)
1177 rest_of_decl_compilation (anon_union_decl,
1178 toplevel_bindings_p (), at_eof);
1181 /* Auxiliary functions to make type signatures for
1182 `operator new' and `operator delete' correspond to
1183 what compiler will be expecting. */
1186 coerce_new_type (tree type)
1189 tree args = TYPE_ARG_TYPES (type);
1191 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1193 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1196 error ("%<operator new%> must return type %qT", ptr_type_node);
1199 if (!args || args == void_list_node
1200 || !same_type_p (TREE_VALUE (args), size_type_node))
1203 if (args && args != void_list_node)
1204 args = TREE_CHAIN (args);
1205 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1206 "as first parameter", size_type_node);
1211 args = tree_cons (NULL_TREE, size_type_node, args);
1214 type = build_exception_variant
1215 (build_function_type (ptr_type_node, args),
1216 TYPE_RAISES_EXCEPTIONS (type));
1224 coerce_delete_type (tree type)
1227 tree args = TYPE_ARG_TYPES (type);
1229 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1231 if (!same_type_p (TREE_TYPE (type), void_type_node))
1234 error ("%<operator delete%> must return type %qT", void_type_node);
1237 if (!args || args == void_list_node
1238 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1241 if (args && args != void_list_node)
1242 args = TREE_CHAIN (args);
1243 error ("%<operator delete%> takes type %qT as first parameter",
1249 args = tree_cons (NULL_TREE, ptr_type_node, args);
1252 type = build_exception_variant
1253 (build_function_type (void_type_node, args),
1254 TYPE_RAISES_EXCEPTIONS (type));
1263 mark_vtable_entries (tree decl)
1265 tree entries = CONSTRUCTOR_ELTS (DECL_INITIAL (decl));
1267 for (; entries; entries = TREE_CHAIN (entries))
1269 tree fnaddr = TREE_VALUE (entries);
1272 STRIP_NOPS (fnaddr);
1274 if (TREE_CODE (fnaddr) != ADDR_EXPR
1275 && TREE_CODE (fnaddr) != FDESC_EXPR)
1276 /* This entry is an offset: a virtual base class offset, a
1277 virtual call offset, an RTTI offset, etc. */
1280 fn = TREE_OPERAND (fnaddr, 0);
1281 TREE_ADDRESSABLE (fn) = 1;
1282 /* When we don't have vcall offsets, we output thunks whenever
1283 we output the vtables that contain them. With vcall offsets,
1284 we know all the thunks we'll need when we emit a virtual
1285 function, so we emit the thunks there instead. */
1286 if (DECL_THUNK_P (fn))
1287 use_thunk (fn, /*emit_p=*/0);
1292 /* Set DECL up to have the closest approximation of "initialized common"
1293 linkage available. */
1296 comdat_linkage (tree decl)
1299 make_decl_one_only (decl);
1300 else if (TREE_CODE (decl) == FUNCTION_DECL
1301 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1302 /* We can just emit function and compiler-generated variables
1303 statically; having multiple copies is (for the most part) only
1306 There are two correctness issues, however: the address of a
1307 template instantiation with external linkage should be the
1308 same, independent of what translation unit asks for the
1309 address, and this will not hold when we emit multiple copies of
1310 the function. However, there's little else we can do.
1312 Also, by default, the typeinfo implementation assumes that
1313 there will be only one copy of the string used as the name for
1314 each type. Therefore, if weak symbols are unavailable, the
1315 run-time library should perform a more conservative check; it
1316 should perform a string comparison, rather than an address
1318 TREE_PUBLIC (decl) = 0;
1321 /* Static data member template instantiations, however, cannot
1322 have multiple copies. */
1323 if (DECL_INITIAL (decl) == 0
1324 || DECL_INITIAL (decl) == error_mark_node)
1325 DECL_COMMON (decl) = 1;
1326 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1328 DECL_COMMON (decl) = 1;
1329 DECL_INITIAL (decl) = error_mark_node;
1331 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1333 /* We can't do anything useful; leave vars for explicit
1335 DECL_EXTERNAL (decl) = 1;
1336 DECL_NOT_REALLY_EXTERN (decl) = 0;
1340 if (DECL_LANG_SPECIFIC (decl))
1341 DECL_COMDAT (decl) = 1;
1344 /* For win32 we also want to put explicit instantiations in
1345 linkonce sections, so that they will be merged with implicit
1346 instantiations; otherwise we get duplicate symbol errors.
1347 For Darwin we do not want explicit instantiations to be
1351 maybe_make_one_only (tree decl)
1353 /* We used to say that this was not necessary on targets that support weak
1354 symbols, because the implicit instantiations will defer to the explicit
1355 one. However, that's not actually the case in SVR4; a strong definition
1356 after a weak one is an error. Also, not making explicit
1357 instantiations one_only means that we can end up with two copies of
1358 some template instantiations. */
1362 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1363 we can get away with not emitting them if they aren't used. We need
1364 to for variables so that cp_finish_decl will update their linkage,
1365 because their DECL_INITIAL may not have been set properly yet. */
1367 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1368 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1369 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1371 make_decl_one_only (decl);
1373 if (TREE_CODE (decl) == VAR_DECL)
1375 DECL_COMDAT (decl) = 1;
1376 /* Mark it needed so we don't forget to emit it. */
1377 mark_decl_referenced (decl);
1382 /* Determine whether or not we want to specifically import or export CTYPE,
1383 using various heuristics. */
1386 import_export_class (tree ctype)
1388 /* -1 for imported, 1 for exported. */
1389 int import_export = 0;
1391 /* It only makes sense to call this function at EOF. The reason is
1392 that this function looks at whether or not the first non-inline
1393 non-abstract virtual member function has been defined in this
1394 translation unit. But, we can't possibly know that until we've
1395 seen the entire translation unit. */
1396 gcc_assert (at_eof);
1398 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1401 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1402 we will have CLASSTYPE_INTERFACE_ONLY set but not
1403 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1404 heuristic because someone will supply a #pragma implementation
1405 elsewhere, and deducing it here would produce a conflict. */
1406 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1409 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1411 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1413 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1414 && !flag_implicit_templates)
1415 /* For a template class, without -fimplicit-templates, check the
1416 repository. If the virtual table is assigned to this
1417 translation unit, then export the class; otherwise, import
1419 import_export = repo_export_class_p (ctype) ? 1 : -1;
1420 else if (TYPE_POLYMORPHIC_P (ctype))
1422 /* The ABI specifies that the virtual table and associated
1423 information are emitted with the key method, if any. */
1424 tree method = CLASSTYPE_KEY_METHOD (ctype);
1425 /* If weak symbol support is not available, then we must be
1426 careful not to emit the vtable when the key function is
1427 inline. An inline function can be defined in multiple
1428 translation units. If we were to emit the vtable in each
1429 translation unit containing a definition, we would get
1430 multiple definition errors at link-time. */
1431 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1432 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1435 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1436 a definition anywhere else. */
1437 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1440 /* Allow backends the chance to overrule the decision. */
1441 if (targetm.cxx.import_export_class)
1442 import_export = targetm.cxx.import_export_class (ctype, import_export);
1446 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1447 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1451 /* Return true if VAR has already been provided to the back end; in that
1452 case VAR should not be modified further by the front end. */
1454 var_finalized_p (tree var)
1456 return cgraph_varpool_node (var)->finalized;
1459 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1460 must be emitted in this translation unit. Mark it as such. */
1463 mark_needed (tree decl)
1465 /* It's possible that we no longer need to set
1466 TREE_SYMBOL_REFERENCED here directly, but doing so is
1468 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1469 mark_decl_referenced (decl);
1472 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1473 returns true if a definition of this entity should be provided in
1474 this object file. Callers use this function to determine whether
1475 or not to let the back end know that a definition of DECL is
1476 available in this translation unit. */
1479 decl_needed_p (tree decl)
1481 gcc_assert (TREE_CODE (decl) == VAR_DECL
1482 || TREE_CODE (decl) == FUNCTION_DECL);
1483 /* This function should only be called at the end of the translation
1484 unit. We cannot be sure of whether or not something will be
1485 COMDAT until that point. */
1486 gcc_assert (at_eof);
1488 /* All entities with external linkage that are not COMDAT should be
1489 emitted; they may be referred to from other object files. */
1490 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1492 /* If this entity was used, let the back-end see it; it will decide
1493 whether or not to emit it into the object file. */
1494 if (TREE_USED (decl)
1495 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1496 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1498 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1499 reference to DECL might cause it to be emitted later. */
1503 /* If necessary, write out the vtables for the dynamic class CTYPE.
1504 Returns true if any vtables were emitted. */
1507 maybe_emit_vtables (tree ctype)
1513 /* If the vtables for this class have already been emitted there is
1514 nothing more to do. */
1515 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1516 if (var_finalized_p (primary_vtbl))
1518 /* Ignore dummy vtables made by get_vtable_decl. */
1519 if (TREE_TYPE (primary_vtbl) == void_type_node)
1522 /* On some targets, we cannot determine the key method until the end
1523 of the translation unit -- which is when this function is
1525 if (!targetm.cxx.key_method_may_be_inline ())
1526 determine_key_method (ctype);
1528 /* See if any of the vtables are needed. */
1529 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1531 import_export_decl (vtbl);
1532 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1537 /* If the references to this class' vtables are optimized away,
1538 still emit the appropriate debugging information. See
1540 if (DECL_COMDAT (primary_vtbl)
1541 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1542 note_debug_info_needed (ctype);
1546 /* The ABI requires that we emit all of the vtables if we emit any
1548 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1550 /* Mark entities references from the virtual table as used. */
1551 mark_vtable_entries (vtbl);
1553 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1555 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1557 /* It had better be all done at compile-time. */
1562 DECL_EXTERNAL (vtbl) = 0;
1563 rest_of_decl_compilation (vtbl, 1, 1);
1565 /* Because we're only doing syntax-checking, we'll never end up
1566 actually marking the variable as written. */
1567 if (flag_syntax_only)
1568 TREE_ASM_WRITTEN (vtbl) = 1;
1571 /* Since we're writing out the vtable here, also write the debug
1573 note_debug_info_needed (ctype);
1578 /* Like c_determine_visibility, but with additional C++-specific
1582 determine_visibility (tree decl)
1586 /* Cloned constructors and destructors get the same visibility as
1587 the underlying function. That should be set up in
1588 maybe_clone_body. */
1589 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1591 /* Give the common code a chance to make a determination. */
1592 if (c_determine_visibility (decl))
1595 /* If DECL is a member of a class, visibility specifiers on the
1596 class can influence the visibility of the DECL. */
1597 if (DECL_CLASS_SCOPE_P (decl))
1598 class_type = DECL_CONTEXT (decl);
1599 else if (TREE_CODE (decl) == VAR_DECL
1600 && DECL_TINFO_P (decl)
1601 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1602 class_type = TREE_TYPE (DECL_NAME (decl));
1605 /* Virtual tables have DECL_CONTEXT set to their associated class,
1606 so they are automatically handled above. */
1607 gcc_assert (TREE_CODE (decl) != VAR_DECL
1608 || !DECL_VTABLE_OR_VTT_P (decl));
1609 /* Entities not associated with any class just get the
1610 visibility specified by their attributes. */
1614 /* By default, static data members and function members receive
1615 the visibility of their containing class. */
1618 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1619 && lookup_attribute ("dllexport", TYPE_ATTRIBUTES (class_type)))
1621 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1622 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1624 else if (TREE_CODE (decl) == FUNCTION_DECL
1625 && DECL_DECLARED_INLINE_P (decl)
1626 && visibility_options.inlines_hidden)
1628 /* Don't change it if it has been set explicitly by user. */
1629 if (!DECL_VISIBILITY_SPECIFIED (decl))
1631 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1632 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1635 else if (CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1637 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1638 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1640 else if (!DECL_VISIBILITY_SPECIFIED (decl))
1642 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1643 DECL_VISIBILITY_SPECIFIED (decl) = 0;
1648 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1649 for DECL has not already been determined, do so now by setting
1650 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1651 function is called entities with vague linkage whose definitions
1652 are available must have TREE_PUBLIC set.
1654 If this function decides to place DECL in COMDAT, it will set
1655 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1656 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1657 callers defer that decision until it is clear that DECL is actually
1661 import_export_decl (tree decl)
1666 tree class_type = NULL_TREE;
1668 if (DECL_INTERFACE_KNOWN (decl))
1671 /* We cannot determine what linkage to give to an entity with vague
1672 linkage until the end of the file. For example, a virtual table
1673 for a class will be defined if and only if the key method is
1674 defined in this translation unit. As a further example, consider
1675 that when compiling a translation unit that uses PCH file with
1676 "-frepo" it would be incorrect to make decisions about what
1677 entities to emit when building the PCH; those decisions must be
1678 delayed until the repository information has been processed. */
1679 gcc_assert (at_eof);
1680 /* Object file linkage for explicit instantiations is handled in
1681 mark_decl_instantiated. For static variables in functions with
1682 vague linkage, maybe_commonize_var is used.
1684 Therefore, the only declarations that should be provided to this
1685 function are those with external linkage that are:
1687 * implicit instantiations of function templates
1691 * implicit instantiations of static data members of class
1698 Furthermore, all entities that reach this point must have a
1699 definition available in this translation unit.
1701 The following assertions check these conditions. */
1702 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1703 || TREE_CODE (decl) == VAR_DECL);
1704 /* Any code that creates entities with TREE_PUBLIC cleared should
1705 also set DECL_INTERFACE_KNOWN. */
1706 gcc_assert (TREE_PUBLIC (decl));
1707 if (TREE_CODE (decl) == FUNCTION_DECL)
1708 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1709 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1710 || DECL_DECLARED_INLINE_P (decl));
1712 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1713 || DECL_VTABLE_OR_VTT_P (decl)
1714 || DECL_TINFO_P (decl));
1715 /* Check that a definition of DECL is available in this translation
1717 gcc_assert (!DECL_REALLY_EXTERN (decl));
1719 /* Assume that DECL will not have COMDAT linkage. */
1721 /* Assume that DECL will not be imported into this translation
1725 /* See if the repository tells us whether or not to emit DECL in
1726 this translation unit. */
1727 emit_p = repo_emit_p (decl);
1730 else if (emit_p == 1)
1732 /* The repository indicates that this entity should be defined
1733 here. Make sure the back end honors that request. */
1734 if (TREE_CODE (decl) == VAR_DECL)
1736 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1737 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1740 FOR_EACH_CLONE (clone, decl)
1741 mark_needed (clone);
1745 /* Output the definition as an ordinary strong definition. */
1746 DECL_EXTERNAL (decl) = 0;
1747 DECL_INTERFACE_KNOWN (decl) = 1;
1752 /* We have already decided what to do with this DECL; there is no
1753 need to check anything further. */
1755 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1757 class_type = DECL_CONTEXT (decl);
1758 import_export_class (class_type);
1759 if (TYPE_FOR_JAVA (class_type))
1761 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
1762 && CLASSTYPE_INTERFACE_ONLY (class_type))
1764 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1765 && !CLASSTYPE_USE_TEMPLATE (class_type)
1766 && CLASSTYPE_KEY_METHOD (class_type)
1767 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
1768 /* The ABI requires that all virtual tables be emitted with
1769 COMDAT linkage. However, on systems where COMDAT symbols
1770 don't show up in the table of contents for a static
1771 archive, or on systems without weak symbols (where we
1772 approximate COMDAT linkage by using internal linkage), the
1773 linker will report errors about undefined symbols because
1774 it will not see the virtual table definition. Therefore,
1775 in the case that we know that the virtual table will be
1776 emitted in only one translation unit, we make the virtual
1777 table an ordinary definition with external linkage. */
1778 DECL_EXTERNAL (decl) = 0;
1779 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
1781 /* CLASS_TYPE is being exported from this translation unit,
1782 so DECL should be defined here. */
1783 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
1784 /* If a class is declared in a header with the "extern
1785 template" extension, then it will not be instantiated,
1786 even in translation units that would normally require
1787 it. Often such classes are explicitly instantiated in
1788 one translation unit. Therefore, the explicit
1789 instantiation must be made visible to other translation
1791 DECL_EXTERNAL (decl) = 0;
1794 /* The generic C++ ABI says that class data is always
1795 COMDAT, even if there is a key function. Some
1796 variants (e.g., the ARM EABI) says that class data
1797 only has COMDAT linkage if the the class data might
1798 be emitted in more than one translation unit. */
1799 if (!CLASSTYPE_KEY_METHOD (class_type)
1800 || targetm.cxx.class_data_always_comdat ())
1802 /* The ABI requires COMDAT linkage. Normally, we
1803 only emit COMDAT things when they are needed;
1804 make sure that we realize that this entity is
1811 else if (!flag_implicit_templates
1812 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
1817 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1819 tree type = TREE_TYPE (DECL_NAME (decl));
1820 if (CLASS_TYPE_P (type))
1823 import_export_class (type);
1824 if (CLASSTYPE_INTERFACE_KNOWN (type)
1825 && TYPE_POLYMORPHIC_P (type)
1826 && CLASSTYPE_INTERFACE_ONLY (type)
1827 /* If -fno-rtti was specified, then we cannot be sure
1828 that RTTI information will be emitted with the
1829 virtual table of the class, so we must emit it
1830 wherever it is used. */
1835 if (CLASSTYPE_INTERFACE_KNOWN (type)
1836 && !CLASSTYPE_INTERFACE_ONLY (type))
1838 comdat_p = targetm.cxx.class_data_always_comdat ();
1843 DECL_EXTERNAL (decl) = 0;
1853 else if (DECL_TEMPLATE_INSTANTIATION (decl)
1854 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1856 /* DECL is an implicit instantiation of a function or static
1858 if (flag_implicit_templates
1859 || (flag_implicit_inline_templates
1860 && TREE_CODE (decl) == FUNCTION_DECL
1861 && DECL_DECLARED_INLINE_P (decl)))
1864 /* If we are not implicitly generating templates, then mark
1865 this entity as undefined in this translation unit. */
1868 else if (DECL_FUNCTION_MEMBER_P (decl))
1870 if (!DECL_DECLARED_INLINE_P (decl))
1872 tree ctype = DECL_CONTEXT (decl);
1873 import_export_class (ctype);
1874 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1876 DECL_NOT_REALLY_EXTERN (decl)
1877 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1878 || (DECL_DECLARED_INLINE_P (decl)
1879 && ! flag_implement_inlines
1880 && !DECL_VINDEX (decl)));
1882 if (!DECL_NOT_REALLY_EXTERN (decl))
1883 DECL_EXTERNAL (decl) = 1;
1885 /* Always make artificials weak. */
1886 if (DECL_ARTIFICIAL (decl) && flag_weak)
1889 maybe_make_one_only (decl);
1900 /* If we are importing DECL into this translation unit, mark is
1901 an undefined here. */
1902 DECL_EXTERNAL (decl) = 1;
1903 DECL_NOT_REALLY_EXTERN (decl) = 0;
1907 /* If we decided to put DECL in COMDAT, mark it accordingly at
1909 comdat_linkage (decl);
1912 /* Give the target a chance to override the visibility associated
1914 if (TREE_CODE (decl) == VAR_DECL
1915 && (DECL_TINFO_P (decl)
1916 || (DECL_VTABLE_OR_VTT_P (decl)
1917 /* Construction virtual tables are not exported because
1918 they cannot be referred to from other object files;
1919 their name is not standardized by the ABI. */
1920 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1921 && TREE_PUBLIC (decl)
1922 && !DECL_REALLY_EXTERN (decl)
1923 && DECL_VISIBILITY_SPECIFIED (decl)
1924 && (!class_type || !CLASSTYPE_VISIBILITY_SPECIFIED (class_type)))
1925 targetm.cxx.determine_class_data_visibility (decl);
1927 DECL_INTERFACE_KNOWN (decl) = 1;
1930 /* Return an expression that performs the destruction of DECL, which
1931 must be a VAR_DECL whose type has a non-trivial destructor, or is
1932 an array whose (innermost) elements have a non-trivial destructor. */
1935 build_cleanup (tree decl)
1938 tree type = TREE_TYPE (decl);
1940 /* This function should only be called for declarations that really
1941 require cleanups. */
1942 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
1944 /* Treat all objects with destructors as used; the destructor may do
1945 something substantive. */
1948 if (TREE_CODE (type) == ARRAY_TYPE)
1952 cxx_mark_addressable (decl);
1953 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1955 temp = build_delete (TREE_TYPE (temp), temp,
1956 sfk_complete_destructor,
1957 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1961 /* Returns the initialization guard variable for the variable DECL,
1962 which has static storage duration. */
1965 get_guard (tree decl)
1970 sname = mangle_guard_variable (decl);
1971 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1976 /* We use a type that is big enough to contain a mutex as well
1977 as an integer counter. */
1978 guard_type = targetm.cxx.guard_type ();
1979 guard = build_decl (VAR_DECL, sname, guard_type);
1981 /* The guard should have the same linkage as what it guards. */
1982 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1983 TREE_STATIC (guard) = TREE_STATIC (decl);
1984 DECL_COMMON (guard) = DECL_COMMON (decl);
1985 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1986 if (TREE_PUBLIC (decl))
1987 DECL_WEAK (guard) = DECL_WEAK (decl);
1989 DECL_ARTIFICIAL (guard) = 1;
1990 DECL_IGNORED_P (guard) = 1;
1991 TREE_USED (guard) = 1;
1992 pushdecl_top_level_and_finish (guard, NULL_TREE);
1997 /* Return those bits of the GUARD variable that should be set when the
1998 guarded entity is actually initialized. */
2001 get_guard_bits (tree guard)
2003 if (!targetm.cxx.guard_mask_bit ())
2005 /* We only set the first byte of the guard, in order to leave room
2006 for a mutex in the high-order bits. */
2007 guard = build1 (ADDR_EXPR,
2008 build_pointer_type (TREE_TYPE (guard)),
2010 guard = build1 (NOP_EXPR,
2011 build_pointer_type (char_type_node),
2013 guard = build1 (INDIRECT_REF, char_type_node, guard);
2019 /* Return an expression which determines whether or not the GUARD
2020 variable has already been initialized. */
2023 get_guard_cond (tree guard)
2027 /* Check to see if the GUARD is zero. */
2028 guard = get_guard_bits (guard);
2030 /* Mask off all but the low bit. */
2031 if (targetm.cxx.guard_mask_bit ())
2033 guard_value = integer_one_node;
2034 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2035 guard_value = convert (TREE_TYPE (guard), guard_value);
2036 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2039 guard_value = integer_zero_node;
2040 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2041 guard_value = convert (TREE_TYPE (guard), guard_value);
2042 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2045 /* Return an expression which sets the GUARD variable, indicating that
2046 the variable being guarded has been initialized. */
2049 set_guard (tree guard)
2053 /* Set the GUARD to one. */
2054 guard = get_guard_bits (guard);
2055 guard_init = integer_one_node;
2056 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2057 guard_init = convert (TREE_TYPE (guard), guard_init);
2058 return build_modify_expr (guard, NOP_EXPR, guard_init);
2061 /* Start the process of running a particular set of global constructors
2062 or destructors. Subroutine of do_[cd]tors. */
2065 start_objects (int method_type, int initp)
2071 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2073 if (initp != DEFAULT_INIT_PRIORITY)
2083 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2086 sprintf (type, "%c", method_type);
2088 fndecl = build_lang_decl (FUNCTION_DECL,
2089 get_file_function_name_long (type),
2090 build_function_type (void_type_node,
2092 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2094 /* It can be a static function as long as collect2 does not have
2095 to scan the object file to find its ctor/dtor routine. */
2096 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2098 /* Mark this declaration as used to avoid spurious warnings. */
2099 TREE_USED (current_function_decl) = 1;
2101 /* Mark this function as a global constructor or destructor. */
2102 if (method_type == 'I')
2103 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2105 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2106 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2108 body = begin_compound_stmt (BCS_FN_BODY);
2110 /* We cannot allow these functions to be elided, even if they do not
2111 have external linkage. And, there's no point in deferring
2112 compilation of thes functions; they're all going to have to be
2114 DECL_INLINE (current_function_decl) = 0;
2115 DECL_UNINLINABLE (current_function_decl) = 1;
2120 /* Finish the process of running a particular set of global constructors
2121 or destructors. Subroutine of do_[cd]tors. */
2124 finish_objects (int method_type, int initp, tree body)
2129 finish_compound_stmt (body);
2130 fn = finish_function (0);
2131 expand_or_defer_fn (fn);
2133 /* When only doing semantic analysis, and no RTL generation, we
2134 can't call functions that directly emit assembly code; there is
2135 no assembly file in which to put the code. */
2136 if (flag_syntax_only)
2139 if (targetm.have_ctors_dtors)
2141 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2142 cgraph_mark_needed_node (cgraph_node (fn));
2143 if (method_type == 'I')
2144 (* targetm.asm_out.constructor) (fnsym, initp);
2146 (* targetm.asm_out.destructor) (fnsym, initp);
2150 /* The names of the parameters to the function created to handle
2151 initializations and destructions for objects with static storage
2153 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2154 #define PRIORITY_IDENTIFIER "__priority"
2156 /* The name of the function we create to handle initializations and
2157 destructions for objects with static storage duration. */
2158 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2160 /* The declaration for the __INITIALIZE_P argument. */
2161 static GTY(()) tree initialize_p_decl;
2163 /* The declaration for the __PRIORITY argument. */
2164 static GTY(()) tree priority_decl;
2166 /* The declaration for the static storage duration function. */
2167 static GTY(()) tree ssdf_decl;
2169 /* All the static storage duration functions created in this
2170 translation unit. */
2171 static GTY(()) VEC(tree,gc) *ssdf_decls;
2173 /* A map from priority levels to information about that priority
2174 level. There may be many such levels, so efficient lookup is
2176 static splay_tree priority_info_map;
2178 /* Begins the generation of the function that will handle all
2179 initialization and destruction of objects with static storage
2180 duration. The function generated takes two parameters of type
2181 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2182 nonzero, it performs initializations. Otherwise, it performs
2183 destructions. It only performs those initializations or
2184 destructions with the indicated __PRIORITY. The generated function
2187 It is assumed that this function will only be called once per
2188 translation unit. */
2191 start_static_storage_duration_function (unsigned count)
2196 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2198 /* Create the identifier for this function. It will be of the form
2199 SSDF_IDENTIFIER_<number>. */
2200 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2202 /* Create the parameters. */
2203 parm_types = void_list_node;
2204 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2205 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2206 type = build_function_type (void_type_node, parm_types);
2208 /* Create the FUNCTION_DECL itself. */
2209 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2210 get_identifier (id),
2212 TREE_PUBLIC (ssdf_decl) = 0;
2213 DECL_ARTIFICIAL (ssdf_decl) = 1;
2215 /* Put this function in the list of functions to be called from the
2216 static constructors and destructors. */
2219 ssdf_decls = VEC_alloc (tree, gc, 32);
2221 /* Take this opportunity to initialize the map from priority
2222 numbers to information about that priority level. */
2223 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2224 /*delete_key_fn=*/0,
2225 /*delete_value_fn=*/
2226 (splay_tree_delete_value_fn) &free);
2228 /* We always need to generate functions for the
2229 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2230 priorities later, we'll be sure to find the
2231 DEFAULT_INIT_PRIORITY. */
2232 get_priority_info (DEFAULT_INIT_PRIORITY);
2235 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2237 /* Create the argument list. */
2238 initialize_p_decl = cp_build_parm_decl
2239 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2240 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2241 TREE_USED (initialize_p_decl) = 1;
2242 priority_decl = cp_build_parm_decl
2243 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2244 DECL_CONTEXT (priority_decl) = ssdf_decl;
2245 TREE_USED (priority_decl) = 1;
2247 TREE_CHAIN (initialize_p_decl) = priority_decl;
2248 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2250 /* Put the function in the global scope. */
2251 pushdecl (ssdf_decl);
2253 /* Start the function itself. This is equivalent to declaring the
2256 static void __ssdf (int __initialize_p, init __priority_p);
2258 It is static because we only need to call this function from the
2259 various constructor and destructor functions for this module. */
2260 start_preparsed_function (ssdf_decl,
2261 /*attrs=*/NULL_TREE,
2264 /* Set up the scope of the outermost block in the function. */
2265 body = begin_compound_stmt (BCS_FN_BODY);
2267 /* This function must not be deferred because we are depending on
2268 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2269 DECL_INLINE (ssdf_decl) = 0;
2270 DECL_UNINLINABLE (ssdf_decl) = 1;
2275 /* Finish the generation of the function which performs initialization
2276 and destruction of objects with static storage duration. After
2277 this point, no more such objects can be created. */
2280 finish_static_storage_duration_function (tree body)
2282 /* Close out the function. */
2283 finish_compound_stmt (body);
2284 expand_or_defer_fn (finish_function (0));
2287 /* Return the information about the indicated PRIORITY level. If no
2288 code to handle this level has yet been generated, generate the
2289 appropriate prologue. */
2291 static priority_info
2292 get_priority_info (int priority)
2297 n = splay_tree_lookup (priority_info_map,
2298 (splay_tree_key) priority);
2301 /* Create a new priority information structure, and insert it
2303 pi = xmalloc (sizeof (struct priority_info_s));
2304 pi->initializations_p = 0;
2305 pi->destructions_p = 0;
2306 splay_tree_insert (priority_info_map,
2307 (splay_tree_key) priority,
2308 (splay_tree_value) pi);
2311 pi = (priority_info) n->value;
2316 /* Set up to handle the initialization or destruction of DECL. If
2317 INITP is nonzero, we are initializing the variable. Otherwise, we
2318 are destroying it. */
2321 start_static_initialization_or_destruction (tree decl, int initp)
2323 tree guard_if_stmt = NULL_TREE;
2330 /* Figure out the priority for this declaration. */
2331 priority = DECL_INIT_PRIORITY (decl);
2333 priority = DEFAULT_INIT_PRIORITY;
2335 /* Remember that we had an initialization or finalization at this
2337 pi = get_priority_info (priority);
2339 pi->initializations_p = 1;
2341 pi->destructions_p = 1;
2343 /* Trick the compiler into thinking we are at the file and line
2344 where DECL was declared so that error-messages make sense, and so
2345 that the debugger will show somewhat sensible file and line
2347 input_location = DECL_SOURCE_LOCATION (decl);
2353 Access control for implicit calls to the constructors,
2354 the conversion functions, or the destructor called to
2355 create and destroy a static data member is performed as
2356 if these calls appeared in the scope of the member's
2359 we pretend we are in a static member function of the class of
2360 which the DECL is a member. */
2361 if (member_p (decl))
2363 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2364 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2367 /* Conditionalize this initialization on being in the right priority
2368 and being initializing/finalizing appropriately. */
2369 guard_if_stmt = begin_if_stmt ();
2370 cond = cp_build_binary_op (EQ_EXPR,
2372 build_int_cst (NULL_TREE, priority));
2373 init_cond = initp ? integer_one_node : integer_zero_node;
2374 init_cond = cp_build_binary_op (EQ_EXPR,
2377 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, init_cond);
2379 /* Assume we don't need a guard. */
2381 /* We need a guard if this is an object with external linkage that
2382 might be initialized in more than one place. (For example, a
2383 static data member of a template, when the data member requires
2385 if (TREE_PUBLIC (decl) && (DECL_COMMON (decl)
2386 || DECL_ONE_ONLY (decl)
2387 || DECL_WEAK (decl)))
2391 guard = get_guard (decl);
2393 /* When using __cxa_atexit, we just check the GUARD as we would
2394 for a local static. */
2395 if (flag_use_cxa_atexit)
2397 /* When using __cxa_atexit, we never try to destroy
2398 anything from a static destructor. */
2400 guard_cond = get_guard_cond (guard);
2402 /* If we don't have __cxa_atexit, then we will be running
2403 destructors from .fini sections, or their equivalents. So,
2404 we need to know how many times we've tried to initialize this
2405 object. We do initializations only if the GUARD is zero,
2406 i.e., if we are the first to initialize the variable. We do
2407 destructions only if the GUARD is one, i.e., if we are the
2408 last to destroy the variable. */
2411 = cp_build_binary_op (EQ_EXPR,
2412 build_unary_op (PREINCREMENT_EXPR,
2418 = cp_build_binary_op (EQ_EXPR,
2419 build_unary_op (PREDECREMENT_EXPR,
2424 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, guard_cond);
2427 finish_if_stmt_cond (cond, guard_if_stmt);
2429 /* If we're using __cxa_atexit, we have not already set the GUARD,
2430 so we must do so now. */
2431 if (guard && initp && flag_use_cxa_atexit)
2432 finish_expr_stmt (set_guard (guard));
2434 return guard_if_stmt;
2437 /* We've just finished generating code to do an initialization or
2438 finalization. GUARD_IF_STMT is the if-statement we used to guard
2439 the initialization. */
2442 finish_static_initialization_or_destruction (tree guard_if_stmt)
2444 finish_then_clause (guard_if_stmt);
2445 finish_if_stmt (guard_if_stmt);
2447 /* Now that we're done with DECL we don't need to pretend to be a
2448 member of its class any longer. */
2449 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2450 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2453 /* Generate code to do the initialization of DECL, a VAR_DECL with
2454 static storage duration. The initialization is INIT. */
2457 do_static_initialization (tree decl, tree init)
2461 /* Set up for the initialization. */
2463 = start_static_initialization_or_destruction (decl,
2466 /* Perform the initialization. */
2468 finish_expr_stmt (init);
2470 /* If we're using __cxa_atexit, register a function that calls the
2471 destructor for the object. */
2472 if (flag_use_cxa_atexit)
2473 finish_expr_stmt (register_dtor_fn (decl));
2476 finish_static_initialization_or_destruction (guard_if_stmt);
2479 /* Generate code to do the static destruction of DECL. If DECL may be
2480 initialized more than once in different object files, GUARD is the
2481 guard variable to check. PRIORITY is the priority for the
2485 do_static_destruction (tree decl)
2489 /* If we're using __cxa_atexit, then destructors are registered
2490 immediately after objects are initialized. */
2491 gcc_assert (!flag_use_cxa_atexit);
2493 /* If we don't need a destructor, there's nothing to do. */
2494 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2497 /* Actually do the destruction. */
2498 guard_if_stmt = start_static_initialization_or_destruction (decl,
2500 finish_expr_stmt (build_cleanup (decl));
2501 finish_static_initialization_or_destruction (guard_if_stmt);
2504 /* VARS is a list of variables with static storage duration which may
2505 need initialization and/or finalization. Remove those variables
2506 that don't really need to be initialized or finalized, and return
2507 the resulting list. The order in which the variables appear in
2508 VARS is in reverse order of the order in which they should actually
2509 be initialized. The list we return is in the unreversed order;
2510 i.e., the first variable should be initialized first. */
2513 prune_vars_needing_no_initialization (tree *vars)
2516 tree result = NULL_TREE;
2521 tree decl = TREE_VALUE (t);
2522 tree init = TREE_PURPOSE (t);
2524 /* Deal gracefully with error. */
2525 if (decl == error_mark_node)
2527 var = &TREE_CHAIN (t);
2531 /* The only things that can be initialized are variables. */
2532 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2534 /* If this object is not defined, we don't need to do anything
2536 if (DECL_EXTERNAL (decl))
2538 var = &TREE_CHAIN (t);
2542 /* Also, if the initializer already contains errors, we can bail
2544 if (init && TREE_CODE (init) == TREE_LIST
2545 && value_member (error_mark_node, init))
2547 var = &TREE_CHAIN (t);
2551 /* This variable is going to need initialization and/or
2552 finalization, so we add it to the list. */
2553 *var = TREE_CHAIN (t);
2554 TREE_CHAIN (t) = result;
2561 /* Make sure we have told the back end about all the variables in
2565 write_out_vars (tree vars)
2569 for (v = vars; v; v = TREE_CHAIN (v))
2571 tree var = TREE_VALUE (v);
2572 if (!var_finalized_p (var))
2574 import_export_decl (var);
2575 rest_of_decl_compilation (var, 1, 1);
2580 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2581 (otherwise) that will initialize all gobal objects with static
2582 storage duration having the indicated PRIORITY. */
2585 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2594 input_location = *locus;
2595 #ifdef USE_MAPPED_LOCATION
2601 /* We use `I' to indicate initialization and `D' to indicate
2603 function_key = constructor_p ? 'I' : 'D';
2605 /* We emit the function lazily, to avoid generating empty
2606 global constructors and destructors. */
2609 /* For Objective-C++, we may need to initialize metadata found in this module.
2610 This must be done _before_ any other static initializations. */
2611 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2612 && constructor_p && objc_static_init_needed_p ())
2614 body = start_objects (function_key, priority);
2615 static_ctors = objc_generate_static_init_call (static_ctors);
2618 /* Call the static storage duration function with appropriate
2620 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2622 /* Calls to pure or const functions will expand to nothing. */
2623 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2626 body = start_objects (function_key, priority);
2628 arguments = tree_cons (NULL_TREE,
2629 build_int_cst (NULL_TREE, priority),
2631 arguments = tree_cons (NULL_TREE,
2632 build_int_cst (NULL_TREE, constructor_p),
2634 finish_expr_stmt (build_function_call (fndecl, arguments));
2638 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2639 calls to any functions marked with attributes indicating that
2640 they should be called at initialization- or destruction-time. */
2641 if (priority == DEFAULT_INIT_PRIORITY)
2645 for (fns = constructor_p ? static_ctors : static_dtors;
2647 fns = TREE_CHAIN (fns))
2649 fndecl = TREE_VALUE (fns);
2651 /* Calls to pure/const functions will expand to nothing. */
2652 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2655 body = start_objects (function_key, priority);
2656 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2661 /* Close out the function. */
2663 finish_objects (function_key, priority, body);
2666 /* Generate constructor and destructor functions for the priority
2670 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2672 location_t *locus = data;
2673 int priority = (int) n->key;
2674 priority_info pi = (priority_info) n->value;
2676 /* Generate the functions themselves, but only if they are really
2678 if (pi->initializations_p
2679 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2680 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2681 if (pi->destructions_p
2682 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2683 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2685 /* Keep iterating. */
2689 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2690 decls referenced from frontend specific constructs; it will be called
2691 only for language-specific tree nodes.
2693 Here we must deal with member pointers. */
2696 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2697 tree from ATTRIBUTE_UNUSED)
2701 switch (TREE_CODE (t))
2704 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2705 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2708 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2709 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2712 if (DECL_VTABLE_OR_VTT_P (t))
2714 /* The ABI requires that all virtual tables be emitted
2715 whenever one of them is. */
2717 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2719 vtbl = TREE_CHAIN (vtbl))
2720 mark_decl_referenced (vtbl);
2722 else if (DECL_CONTEXT (t)
2723 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2724 /* If we need a static variable in a function, then we
2725 need the containing function. */
2726 mark_decl_referenced (DECL_CONTEXT (t));
2735 /* Java requires that we be able to reference a local address for a
2736 method, and not be confused by PLT entries. If hidden aliases are
2737 supported, emit one for each java function that we've emitted. */
2740 build_java_method_aliases (void)
2742 struct cgraph_node *node;
2744 #ifndef HAVE_GAS_HIDDEN
2748 for (node = cgraph_nodes; node ; node = node->next)
2750 tree fndecl = node->decl;
2752 if (TREE_ASM_WRITTEN (fndecl)
2753 && DECL_CONTEXT (fndecl)
2754 && TYPE_P (DECL_CONTEXT (fndecl))
2755 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2756 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2758 /* Mangle the name in a predictable way; we need to reference
2759 this from a java compiled object file. */
2760 tree oid, nid, alias;
2764 oid = DECL_ASSEMBLER_NAME (fndecl);
2765 oname = IDENTIFIER_POINTER (oid);
2766 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
2767 nname = ACONCAT (("_ZGA", oname+2, NULL));
2768 nid = get_identifier (nname);
2770 alias = make_alias_for (fndecl, nid);
2771 TREE_PUBLIC (alias) = 1;
2772 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
2774 assemble_alias (alias, oid);
2779 /* This routine is called from the last rule in yyparse ().
2780 Its job is to create all the code needed to initialize and
2781 destroy the global aggregates. We do the destruction
2782 first, since that way we only need to reverse the decls once. */
2785 cp_finish_file (void)
2791 unsigned ssdf_count = 0;
2795 locus = input_location;
2798 /* Bad parse errors. Just forget about it. */
2799 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2803 c_common_write_pch ();
2805 #ifdef USE_MAPPED_LOCATION
2808 /* Otherwise, GDB can get confused, because in only knows
2809 about source for LINENO-1 lines. */
2813 /* We now have to write out all the stuff we put off writing out.
2816 o Template specializations that we have not yet instantiated,
2817 but which are needed.
2818 o Initialization and destruction for non-local objects with
2819 static storage duration. (Local objects with static storage
2820 duration are initialized when their scope is first entered,
2821 and are cleaned up via atexit.)
2822 o Virtual function tables.
2824 All of these may cause others to be needed. For example,
2825 instantiating one function may cause another to be needed, and
2826 generating the initializer for an object may cause templates to be
2827 instantiated, etc., etc. */
2829 timevar_push (TV_VARCONST);
2831 emit_support_tinfos ();
2840 /* If there are templates that we've put off instantiating, do
2842 instantiate_pending_templates (retries);
2845 /* Write out virtual tables as required. Note that writing out
2846 the virtual table for a template class may cause the
2847 instantiation of members of that class. If we write out
2848 vtables then we remove the class from our list so we don't
2849 have to look at it again. */
2851 while (keyed_classes != NULL_TREE
2852 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2855 keyed_classes = TREE_CHAIN (keyed_classes);
2861 tree next = TREE_CHAIN (t);
2865 if (maybe_emit_vtables (TREE_VALUE (next)))
2868 TREE_CHAIN (t) = TREE_CHAIN (next);
2873 next = TREE_CHAIN (t);
2877 /* Write out needed type info variables. We have to be careful
2878 looping through unemitted decls, because emit_tinfo_decl may
2879 cause other variables to be needed. New elements will be
2880 appended, and we remove from the vector those that actually
2882 for (i = VEC_length (tree, unemitted_tinfo_decls);
2883 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
2884 if (emit_tinfo_decl (t))
2887 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
2890 /* The list of objects with static storage duration is built up
2891 in reverse order. We clear STATIC_AGGREGATES so that any new
2892 aggregates added during the initialization of these will be
2893 initialized in the correct order when we next come around the
2895 vars = prune_vars_needing_no_initialization (&static_aggregates);
2901 /* We need to start a new initialization function each time
2902 through the loop. That's because we need to know which
2903 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2904 isn't computed until a function is finished, and written
2905 out. That's a deficiency in the back-end. When this is
2906 fixed, these initialization functions could all become
2907 inline, with resulting performance improvements. */
2910 /* Set the line and file, so that it is obviously not from
2912 input_location = locus;
2913 ssdf_body = start_static_storage_duration_function (ssdf_count);
2915 /* Make sure the back end knows about all the variables. */
2916 write_out_vars (vars);
2918 /* First generate code to do all the initializations. */
2919 for (v = vars; v; v = TREE_CHAIN (v))
2920 do_static_initialization (TREE_VALUE (v),
2923 /* Then, generate code to do all the destructions. Do these
2924 in reverse order so that the most recently constructed
2925 variable is the first destroyed. If we're using
2926 __cxa_atexit, then we don't need to do this; functions
2927 were registered at initialization time to destroy the
2929 if (!flag_use_cxa_atexit)
2931 vars = nreverse (vars);
2932 for (v = vars; v; v = TREE_CHAIN (v))
2933 do_static_destruction (TREE_VALUE (v));
2938 /* Finish up the static storage duration function for this
2940 input_location = locus;
2941 finish_static_storage_duration_function (ssdf_body);
2943 /* All those initializations and finalizations might cause
2944 us to need more inline functions, more template
2945 instantiations, etc. */
2948 #ifdef USE_MAPPED_LOCATION
2955 /* Go through the set of inline functions whose bodies have not
2956 been emitted yet. If out-of-line copies of these functions
2957 are required, emit them. */
2958 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
2960 /* Does it need synthesizing? */
2961 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2962 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2964 /* Even though we're already at the top-level, we push
2965 there again. That way, when we pop back a few lines
2966 hence, all of our state is restored. Otherwise,
2967 finish_function doesn't clean things up, and we end
2968 up with CURRENT_FUNCTION_DECL set. */
2969 push_to_top_level ();
2970 /* The decl's location will mark where it was first
2971 needed. Save that so synthesize method can indicate
2972 where it was needed from, in case of error */
2973 input_location = DECL_SOURCE_LOCATION (decl);
2974 synthesize_method (decl);
2975 pop_from_top_level ();
2979 if (!DECL_SAVED_TREE (decl))
2982 import_export_decl (decl);
2984 /* We lie to the back-end, pretending that some functions
2985 are not defined when they really are. This keeps these
2986 functions from being put out unnecessarily. But, we must
2987 stop lying when the functions are referenced, or if they
2988 are not comdat since they need to be put out now. This
2989 is done in a separate for cycle, because if some deferred
2990 function is contained in another deferred function later
2991 in deferred_fns varray, rest_of_compilation would skip
2992 this function and we really cannot expand the same
2994 if (DECL_NOT_REALLY_EXTERN (decl)
2995 && DECL_INITIAL (decl)
2996 && decl_needed_p (decl))
2997 DECL_EXTERNAL (decl) = 0;
2999 /* If we're going to need to write this function out, and
3000 there's already a body for it, create RTL for it now.
3001 (There might be no body if this is a method we haven't
3002 gotten around to synthesizing yet.) */
3003 if (!DECL_EXTERNAL (decl)
3004 && decl_needed_p (decl)
3005 && !TREE_ASM_WRITTEN (decl)
3006 && !cgraph_node (decl)->local.finalized)
3008 /* We will output the function; no longer consider it in this
3010 DECL_DEFER_OUTPUT (decl) = 0;
3011 /* Generate RTL for this function now that we know we
3013 expand_or_defer_fn (decl);
3014 /* If we're compiling -fsyntax-only pretend that this
3015 function has been written out so that we don't try to
3017 if (flag_syntax_only)
3018 TREE_ASM_WRITTEN (decl) = 1;
3023 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3026 /* Static data members are just like namespace-scope globals. */
3027 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3029 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3031 import_export_decl (decl);
3032 /* If this static data member is needed, provide it to the
3034 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3035 DECL_EXTERNAL (decl) = 0;
3037 if (VEC_length (tree, pending_statics) != 0
3038 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3039 VEC_length (tree, pending_statics)))
3046 /* All used inline functions must have a definition at this point. */
3047 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3049 if (/* Check online inline functions that were actually used. */
3050 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3051 /* But not defined. */
3052 && DECL_REALLY_EXTERN (decl)
3053 /* If we decided to emit this function in another
3054 translation unit, the fact that the definition was
3055 missing here likely indicates only that the repository
3056 decided to place the function elsewhere. With -Winline,
3057 we will still warn if we could not inline the
3059 && !flag_use_repository
3060 /* An explicit instantiation can be used to specify
3061 that the body is in another unit. It will have
3062 already verified there was a definition. */
3063 && !DECL_EXPLICIT_INSTANTIATION (decl))
3065 warning (0, "inline function %q+D used but never defined", decl);
3066 /* This symbol is effectively an "extern" declaration now.
3067 This is not strictly necessary, but removes a duplicate
3069 TREE_PUBLIC (decl) = 1;
3073 /* We give C linkage to static constructors and destructors. */
3074 push_lang_context (lang_name_c);
3076 /* Generate initialization and destruction functions for all
3077 priorities for which they are required. */
3078 if (priority_info_map)
3079 splay_tree_foreach (priority_info_map,
3080 generate_ctor_and_dtor_functions_for_priority,
3086 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3087 DEFAULT_INIT_PRIORITY, &locus);
3089 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3090 DEFAULT_INIT_PRIORITY, &locus);
3093 /* We're done with the splay-tree now. */
3094 if (priority_info_map)
3095 splay_tree_delete (priority_info_map);
3097 /* Generate any missing aliases. */
3098 maybe_apply_pending_pragma_weaks ();
3100 /* We're done with static constructors, so we can go back to "C++"
3102 pop_lang_context ();
3104 cgraph_finalize_compilation_unit ();
3107 /* Now, issue warnings about static, but not defined, functions,
3108 etc., and emit debugging information. */
3109 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3110 if (VEC_length (tree, pending_statics) != 0)
3111 check_global_declarations (VEC_address (tree, pending_statics),
3112 VEC_length (tree, pending_statics));
3114 /* Generate hidden aliases for Java. */
3115 build_java_method_aliases ();
3119 /* The entire file is now complete. If requested, dump everything
3123 FILE *stream = dump_begin (TDI_tu, &flags);
3127 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3128 dump_end (TDI_tu, stream);
3132 timevar_pop (TV_VARCONST);
3134 if (flag_detailed_statistics)
3136 dump_tree_statistics ();
3137 dump_time_statistics ();
3139 input_location = locus;
3141 #ifdef ENABLE_CHECKING
3142 validate_conversion_obstack ();
3143 #endif /* ENABLE_CHECKING */
3146 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3147 function to call in parse-tree form; it has not yet been
3148 semantically analyzed. ARGS are the arguments to the function.
3149 They have already been semantically analyzed. */
3152 build_offset_ref_call_from_tree (tree fn, tree args)
3161 object = TREE_OPERAND (fn, 0);
3163 if (processing_template_decl)
3165 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3166 || TREE_CODE (fn) == MEMBER_REF);
3167 if (type_dependent_expression_p (fn)
3168 || any_type_dependent_arguments_p (args))
3169 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3171 /* Transform the arguments and add the implicit "this"
3172 parameter. That must be done before the FN is transformed
3173 because we depend on the form of FN. */
3174 args = build_non_dependent_args (args);
3175 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3176 object = build_unary_op (ADDR_EXPR, object, 0);
3177 object = build_non_dependent_expr (object);
3178 args = tree_cons (NULL_TREE, object, args);
3179 /* Now that the arguments are done, transform FN. */
3180 fn = build_non_dependent_expr (fn);
3183 /* A qualified name corresponding to a bound pointer-to-member is
3184 represented as an OFFSET_REF:
3186 struct B { void g(); };
3188 void B::g() { (this->*p)(); } */
3189 if (TREE_CODE (fn) == OFFSET_REF)
3191 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3192 fn = TREE_OPERAND (fn, 1);
3193 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3194 args = tree_cons (NULL_TREE, object_addr, args);
3197 expr = build_function_call (fn, args);
3198 if (processing_template_decl && expr != error_mark_node)
3199 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3205 check_default_args (tree x)
3207 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3208 bool saw_def = false;
3209 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3210 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3212 if (TREE_PURPOSE (arg))
3216 error ("default argument missing for parameter %P of %q+#D", i, x);
3223 mark_used (tree decl)
3225 TREE_USED (decl) = 1;
3226 if (processing_template_decl || skip_evaluation)
3229 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3230 && !TREE_ASM_WRITTEN (decl))
3231 /* Remember it, so we can check it was defined. */
3233 if (DECL_DEFERRED_FN (decl))
3236 /* Remember the current location for a function we will end up
3237 synthesizing. Then we can inform the user where it was
3238 required in the case of error. */
3239 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3240 && !DECL_THUNK_P (decl))
3241 DECL_SOURCE_LOCATION (decl) = input_location;
3243 note_vague_linkage_fn (decl);
3246 assemble_external (decl);
3248 /* Is it a synthesized method that needs to be synthesized? */
3249 if (TREE_CODE (decl) == FUNCTION_DECL
3250 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3251 && DECL_ARTIFICIAL (decl)
3252 && !DECL_THUNK_P (decl)
3253 && ! DECL_INITIAL (decl)
3254 /* Kludge: don't synthesize for default args. Unfortunately this
3255 rules out initializers of namespace-scoped objects too, but
3256 it's sort-of ok if the implicit ctor or dtor decl keeps
3257 pointing to the class location. */
3258 && current_function_decl)
3260 synthesize_method (decl);
3261 /* If we've already synthesized the method we don't need to
3262 instantiate it, so we can return right away. */
3266 /* If this is a function or variable that is an instance of some
3267 template, we now know that we will need to actually do the
3268 instantiation. We check that DECL is not an explicit
3269 instantiation because that is not checked in instantiate_decl. */
3270 if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3271 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3272 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3273 || (TREE_CODE (decl) == FUNCTION_DECL
3274 && DECL_INLINE (DECL_TEMPLATE_RESULT
3275 (template_for_substitution (decl))))))
3276 /* We put off instantiating functions in order to improve compile
3277 times. Maintaining a stack of active functions is expensive,
3278 and the inliner knows to instantiate any functions it might
3280 instantiate_decl (decl, /*defer_ok=*/true, /*undefined_ok=*/0);
3283 #include "gt-cp-decl2.h"