1 /* Handle the hair of processing (but not expanding) inline functions.
2 Also manage function and variable name overloading.
3 Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING. If not, write to
21 the Free Software Foundation, 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
25 /* Handle method declarations. */
28 #include "coretypes.h"
40 /* Various flags to control the mangling process. */
46 /* The thing we are presently mangling is part of a template type,
47 rather than a fully instantiated type. Therefore, we may see
48 complex expressions where we would normally expect to see a
49 simple integer constant. */
50 mf_maybe_uninstantiated = 1,
51 /* When mangling a numeric value, use the form `_XX_' (instead of
52 just `XX') if the value has more than one digit. */
53 mf_use_underscores_around_value = 2
56 typedef enum mangling_flags mangling_flags;
58 static tree thunk_adjust (tree, bool, HOST_WIDE_INT, tree);
59 static void do_build_assign_ref (tree);
60 static void do_build_copy_constructor (tree);
61 static tree synthesize_exception_spec (tree, tree (*) (tree, void *), void *);
62 static tree locate_dtor (tree, void *);
63 static tree locate_ctor (tree, void *);
64 static tree locate_copy (tree, void *);
66 static tree make_alias_for_thunk (tree);
69 /* Called once to initialize method.c. */
78 /* Set the mangled name (DECL_ASSEMBLER_NAME) for DECL. */
81 set_mangled_name_for_decl (tree decl)
83 if (processing_template_decl)
84 /* There's no need to mangle the name of a template function. */
91 /* Return a this or result adjusting thunk to FUNCTION. THIS_ADJUSTING
92 indicates whether it is a this or result adjusting thunk.
93 FIXED_OFFSET and VIRTUAL_OFFSET indicate how to do the adjustment
94 (see thunk_adjust). VIRTUAL_OFFSET can be NULL, but FIXED_OFFSET
95 never is. VIRTUAL_OFFSET is the /index/ into the vtable for this
96 adjusting thunks, we scale it to a byte offset. For covariant
97 thunks VIRTUAL_OFFSET is the virtual binfo. You must post process
98 the returned thunk with finish_thunk. */
101 make_thunk (tree function, bool this_adjusting,
102 tree fixed_offset, tree virtual_offset)
107 my_friendly_assert (TREE_CODE (function) == FUNCTION_DECL, 20021025);
108 /* We can have this thunks to covariant thunks, but not vice versa. */
109 my_friendly_assert (!DECL_THIS_THUNK_P (function), 20021127);
110 my_friendly_assert (!DECL_RESULT_THUNK_P (function) || this_adjusting,
113 /* Scale the VIRTUAL_OFFSET to be in terms of bytes. */
114 if (this_adjusting && virtual_offset)
116 = size_binop (MULT_EXPR,
119 TYPE_SIZE_UNIT (vtable_entry_type)));
121 d = tree_low_cst (fixed_offset, 0);
123 /* See if we already have the thunk in question. For this_adjusting
124 thunks VIRTUAL_OFFSET will be an INTEGER_CST, for covariant thunks it
126 for (thunk = DECL_THUNKS (function); thunk; thunk = TREE_CHAIN (thunk))
127 if (DECL_THIS_THUNK_P (thunk) == this_adjusting
128 && THUNK_FIXED_OFFSET (thunk) == d
129 && !virtual_offset == !THUNK_VIRTUAL_OFFSET (thunk)
132 ? tree_int_cst_equal (THUNK_VIRTUAL_OFFSET (thunk),
134 : THUNK_VIRTUAL_OFFSET (thunk) == virtual_offset)))
137 /* All thunks must be created before FUNCTION is actually emitted;
138 the ABI requires that all thunks be emitted together with the
139 function to which they transfer control. */
140 my_friendly_assert (!TREE_ASM_WRITTEN (function), 20021025);
141 /* Likewise, we can only be adding thunks to a function declared in
142 the class currently being laid out. */
143 my_friendly_assert (TYPE_SIZE (DECL_CONTEXT (function))
144 && TYPE_BEING_DEFINED (DECL_CONTEXT (function)),
147 thunk = build_decl (FUNCTION_DECL, NULL_TREE, TREE_TYPE (function));
148 DECL_LANG_SPECIFIC (thunk) = DECL_LANG_SPECIFIC (function);
149 cxx_dup_lang_specific_decl (thunk);
150 DECL_THUNKS (thunk) = NULL_TREE;
152 DECL_CONTEXT (thunk) = DECL_CONTEXT (function);
153 TREE_READONLY (thunk) = TREE_READONLY (function);
154 TREE_THIS_VOLATILE (thunk) = TREE_THIS_VOLATILE (function);
155 TREE_PUBLIC (thunk) = TREE_PUBLIC (function);
157 comdat_linkage (thunk);
158 SET_DECL_THUNK_P (thunk, this_adjusting);
159 THUNK_TARGET (thunk) = function;
160 THUNK_FIXED_OFFSET (thunk) = d;
161 THUNK_VIRTUAL_OFFSET (thunk) = virtual_offset;
162 THUNK_ALIAS (thunk) = NULL_TREE;
164 /* The thunk itself is not a constructor or destructor, even if
165 the thing it is thunking to is. */
166 DECL_INTERFACE_KNOWN (thunk) = 1;
167 DECL_NOT_REALLY_EXTERN (thunk) = 1;
168 DECL_SAVED_FUNCTION_DATA (thunk) = NULL;
169 DECL_DESTRUCTOR_P (thunk) = 0;
170 DECL_CONSTRUCTOR_P (thunk) = 0;
171 /* And neither is it a clone. */
172 DECL_CLONED_FUNCTION (thunk) = NULL_TREE;
173 DECL_EXTERNAL (thunk) = 1;
174 DECL_ARTIFICIAL (thunk) = 1;
175 /* Even if this thunk is a member of a local class, we don't
176 need a static chain. */
177 DECL_NO_STATIC_CHAIN (thunk) = 1;
178 /* The THUNK is not a pending inline, even if the FUNCTION is. */
179 DECL_PENDING_INLINE_P (thunk) = 0;
180 DECL_INLINE (thunk) = 0;
181 DECL_DECLARED_INLINE_P (thunk) = 0;
182 /* Nor has it been deferred. */
183 DECL_DEFERRED_FN (thunk) = 0;
185 /* Add it to the list of thunks associated with FUNCTION. */
186 TREE_CHAIN (thunk) = DECL_THUNKS (function);
187 DECL_THUNKS (function) = thunk;
192 /* Finish THUNK, a thunk decl. */
195 finish_thunk (tree thunk)
198 tree fixed_offset = ssize_int (THUNK_FIXED_OFFSET (thunk));
199 tree virtual_offset = THUNK_VIRTUAL_OFFSET (thunk);
201 my_friendly_assert (!DECL_NAME (thunk) && DECL_THUNK_P (thunk), 20021127);
202 if (virtual_offset && DECL_RESULT_THUNK_P (thunk))
203 virtual_offset = BINFO_VPTR_FIELD (virtual_offset);
204 function = THUNK_TARGET (thunk);
205 name = mangle_thunk (function, DECL_THIS_THUNK_P (thunk),
206 fixed_offset, virtual_offset);
208 /* We can end up with declarations of (logically) different
209 covariant thunks, that do identical adjustments. The two thunks
210 will be adjusting between within different hierarchies, which
211 happen to have the same layout. We must nullify one of them to
212 refer to the other. */
213 if (DECL_RESULT_THUNK_P (thunk))
217 for (cov_probe = DECL_THUNKS (function);
218 cov_probe; cov_probe = TREE_CHAIN (cov_probe))
219 if (DECL_NAME (cov_probe) == name)
221 my_friendly_assert (!DECL_THUNKS (thunk), 20031023);
222 THUNK_ALIAS (thunk) = (THUNK_ALIAS (cov_probe)
223 ? THUNK_ALIAS (cov_probe) : cov_probe);
228 DECL_NAME (thunk) = name;
229 SET_DECL_ASSEMBLER_NAME (thunk, name);
232 /* Adjust PTR by the constant FIXED_OFFSET, and by the vtable
233 offset indicated by VIRTUAL_OFFSET, if that is
234 non-null. THIS_ADJUSTING is nonzero for a this adjusting thunk and
235 zero for a result adjusting thunk. */
238 thunk_adjust (tree ptr, bool this_adjusting,
239 HOST_WIDE_INT fixed_offset, tree virtual_offset)
242 /* Adjust the pointer by the constant. */
243 ptr = fold (build (PLUS_EXPR, TREE_TYPE (ptr), ptr,
244 ssize_int (fixed_offset)));
246 /* If there's a virtual offset, look up that value in the vtable and
247 adjust the pointer again. */
252 ptr = save_expr (ptr);
253 /* The vptr is always at offset zero in the object. */
254 vtable = build1 (NOP_EXPR,
255 build_pointer_type (build_pointer_type
256 (vtable_entry_type)),
258 /* Form the vtable address. */
259 vtable = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (vtable)), vtable);
260 /* Find the entry with the vcall offset. */
261 vtable = build (PLUS_EXPR, TREE_TYPE (vtable), vtable, virtual_offset);
262 /* Get the offset itself. */
263 vtable = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (vtable)), vtable);
264 /* Adjust the `this' pointer. */
265 ptr = fold (build (PLUS_EXPR, TREE_TYPE (ptr), ptr, vtable));
269 /* Adjust the pointer by the constant. */
270 ptr = fold (build (PLUS_EXPR, TREE_TYPE (ptr), ptr,
271 ssize_int (fixed_offset)));
276 /* Garbage collector tables contains thunk_labelno even when places
277 inside ifdef block. */
278 static GTY (()) int thunk_labelno;
279 #ifdef ASM_OUTPUT_DEF
281 /* Create a static alias to function. */
284 make_alias_for_thunk (tree function)
289 ASM_GENERATE_INTERNAL_LABEL (buf, "LTHUNK", thunk_labelno);
291 alias = build_decl (FUNCTION_DECL, get_identifier (buf),
292 TREE_TYPE (function));
293 DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (function);
294 cxx_dup_lang_specific_decl (alias);
295 DECL_CONTEXT (alias) = NULL;
296 TREE_READONLY (alias) = TREE_READONLY (function);
297 TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (function);
298 TREE_PUBLIC (alias) = 0;
299 DECL_INTERFACE_KNOWN (alias) = 1;
300 DECL_NOT_REALLY_EXTERN (alias) = 1;
301 DECL_THIS_STATIC (alias) = 1;
302 DECL_SAVED_FUNCTION_DATA (alias) = NULL;
303 DECL_DESTRUCTOR_P (alias) = 0;
304 DECL_CONSTRUCTOR_P (alias) = 0;
305 DECL_CLONED_FUNCTION (alias) = NULL_TREE;
306 DECL_EXTERNAL (alias) = 0;
307 DECL_ARTIFICIAL (alias) = 1;
308 DECL_NO_STATIC_CHAIN (alias) = 1;
309 DECL_PENDING_INLINE_P (alias) = 0;
310 DECL_INLINE (alias) = 0;
311 DECL_DECLARED_INLINE_P (alias) = 0;
312 DECL_DEFERRED_FN (alias) = 0;
313 DECL_USE_TEMPLATE (alias) = 0;
314 DECL_TEMPLATE_INSTANTIATED (alias) = 0;
315 DECL_TEMPLATE_INFO (alias) = NULL;
316 DECL_INITIAL (alias) = error_mark_node;
317 TREE_ADDRESSABLE (alias) = 1;
318 TREE_USED (alias) = 1;
319 SET_DECL_ASSEMBLER_NAME (alias, DECL_NAME (alias));
320 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias)) = 1;
321 if (!flag_syntax_only)
322 assemble_alias (alias, DECL_ASSEMBLER_NAME (function));
327 /* Emit the definition of a C++ multiple inheritance or covariant
328 return vtable thunk. If EMIT_P is nonzero, the thunk is emitted
332 use_thunk (tree thunk_fndecl, bool emit_p)
334 tree function, alias;
336 HOST_WIDE_INT fixed_offset, virtual_value;
337 bool this_adjusting = DECL_THIS_THUNK_P (thunk_fndecl);
339 /* We should have called finish_thunk to give it a name. */
340 my_friendly_assert (DECL_NAME (thunk_fndecl), 20021127);
342 /* We should never be using an alias, always refer to the
344 my_friendly_assert (!THUNK_ALIAS (thunk_fndecl), 20031023);
346 if (TREE_ASM_WRITTEN (thunk_fndecl))
349 function = THUNK_TARGET (thunk_fndecl);
350 if (DECL_RESULT (thunk_fndecl))
351 /* We already turned this thunk into an ordinary function.
352 There's no need to process this thunk again. */
355 /* Thunks are always addressable; they only appear in vtables. */
356 TREE_ADDRESSABLE (thunk_fndecl) = 1;
358 /* Figure out what function is being thunked to. It's referenced in
359 this translation unit. */
360 TREE_ADDRESSABLE (function) = 1;
361 mark_used (function);
362 mark_referenced (DECL_ASSEMBLER_NAME (function));
366 #ifdef ASM_OUTPUT_DEF
367 alias = make_alias_for_thunk (function);
372 fixed_offset = THUNK_FIXED_OFFSET (thunk_fndecl);
373 virtual_offset = THUNK_VIRTUAL_OFFSET (thunk_fndecl);
378 virtual_offset = BINFO_VPTR_FIELD (virtual_offset);
379 virtual_value = tree_low_cst (virtual_offset, /*pos=*/0);
380 my_friendly_assert (virtual_value, 20021026);
385 /* And, if we need to emit the thunk, it's used. */
386 mark_used (thunk_fndecl);
387 /* This thunk is actually defined. */
388 DECL_EXTERNAL (thunk_fndecl) = 0;
389 /* The linkage of the function may have changed. FIXME in linkage
391 TREE_PUBLIC (thunk_fndecl) = TREE_PUBLIC (function);
392 DECL_VISIBILITY (thunk_fndecl) = DECL_VISIBILITY (function);
394 if (flag_syntax_only)
396 TREE_ASM_WRITTEN (thunk_fndecl) = 1;
400 push_to_top_level ();
402 #ifdef ASM_OUTPUT_DEF
403 if (targetm.have_named_sections)
405 resolve_unique_section (function, 0, flag_function_sections);
407 if (DECL_SECTION_NAME (function) != NULL && DECL_ONE_ONLY (function))
409 resolve_unique_section (thunk_fndecl, 0, flag_function_sections);
411 /* Output the thunk into the same section as function. */
412 DECL_SECTION_NAME (thunk_fndecl) = DECL_SECTION_NAME (function);
417 /* The back-end expects DECL_INITIAL to contain a BLOCK, so we
419 DECL_INITIAL (thunk_fndecl) = make_node (BLOCK);
420 BLOCK_VARS (DECL_INITIAL (thunk_fndecl)) = DECL_ARGUMENTS (thunk_fndecl);
423 && targetm.asm_out.can_output_mi_thunk (thunk_fndecl, fixed_offset,
424 virtual_value, alias))
427 current_function_decl = thunk_fndecl;
428 DECL_RESULT (thunk_fndecl)
429 = build_decl (RESULT_DECL, 0, integer_type_node);
430 fnname = XSTR (XEXP (DECL_RTL (thunk_fndecl), 0), 0);
431 init_function_start (thunk_fndecl);
432 current_function_is_thunk = 1;
433 assemble_start_function (thunk_fndecl, fnname);
435 targetm.asm_out.output_mi_thunk (asm_out_file, thunk_fndecl,
436 fixed_offset, virtual_value, alias);
438 assemble_end_function (thunk_fndecl, fnname);
439 current_function_decl = 0;
441 /* Because init_function_start increments this, we must
443 immediate_size_expand--;
444 TREE_ASM_WRITTEN (thunk_fndecl) = 1;
448 /* If this is a covariant thunk, or we don't have the necessary
449 code for efficient thunks, generate a thunk function that
450 just makes a call to the real function. Unfortunately, this
451 doesn't work for varargs. */
455 if (varargs_function_p (function))
456 error ("generic thunk code fails for method `%#D' which uses `...'",
459 /* Set up cloned argument trees for the thunk. */
461 for (a = DECL_ARGUMENTS (function); a; a = TREE_CHAIN (a))
463 tree x = copy_node (a);
465 DECL_CONTEXT (x) = thunk_fndecl;
466 SET_DECL_RTL (x, NULL_RTX);
470 DECL_ARGUMENTS (thunk_fndecl) = a;
471 DECL_RESULT (thunk_fndecl) = NULL_TREE;
473 start_function (NULL_TREE, thunk_fndecl, NULL_TREE, SF_PRE_PARSED);
474 /* We don't bother with a body block for thunks. */
476 /* There's no need to check accessibility inside the thunk body. */
477 push_deferring_access_checks (dk_no_check);
481 t = thunk_adjust (t, /*this_adjusting=*/1,
482 fixed_offset, virtual_offset);
484 /* Build up the call to the real function. */
485 t = tree_cons (NULL_TREE, t, NULL_TREE);
486 for (a = TREE_CHAIN (a); a; a = TREE_CHAIN (a))
487 t = tree_cons (NULL_TREE, a, t);
489 t = build_call (alias, t);
490 CALL_FROM_THUNK_P (t) = 1;
492 if (VOID_TYPE_P (TREE_TYPE (t)))
493 finish_expr_stmt (t);
496 t = force_target_expr (TREE_TYPE (t), t);
498 t = thunk_adjust (t, /*this_adjusting=*/0,
499 fixed_offset, virtual_offset);
500 finish_return_stmt (t);
503 /* Since we want to emit the thunk, we explicitly mark its name as
505 mark_referenced (DECL_ASSEMBLER_NAME (thunk_fndecl));
507 /* But we don't want debugging information about it. */
508 DECL_IGNORED_P (thunk_fndecl) = 1;
510 /* Re-enable access control. */
511 pop_deferring_access_checks ();
513 expand_body (finish_function (0));
516 pop_from_top_level ();
519 /* Code for synthesizing methods which have default semantics defined. */
521 /* Generate code for default X(X&) constructor. */
524 do_build_copy_constructor (tree fndecl)
526 tree parm = FUNCTION_FIRST_USER_PARM (fndecl);
529 parm = convert_from_reference (parm);
531 if (TYPE_HAS_TRIVIAL_INIT_REF (current_class_type)
532 && is_empty_class (current_class_type))
533 /* Don't copy the padding byte; it might not have been allocated
534 if *this is a base subobject. */;
535 else if (TYPE_HAS_TRIVIAL_INIT_REF (current_class_type))
537 t = build (INIT_EXPR, void_type_node, current_class_ref, parm);
538 finish_expr_stmt (t);
542 tree fields = TYPE_FIELDS (current_class_type);
543 int n_bases = CLASSTYPE_N_BASECLASSES (current_class_type);
544 tree binfos = TYPE_BINFO_BASETYPES (current_class_type);
545 tree member_init_list = NULL_TREE;
546 int cvquals = cp_type_quals (TREE_TYPE (parm));
549 /* Initialize all the base-classes with the parameter converted
550 to their type so that we get their copy constructor and not
551 another constructor that takes current_class_type. We must
552 deal with the binfo's directly as a direct base might be
553 inaccessible due to ambiguity. */
554 for (t = CLASSTYPE_VBASECLASSES (current_class_type); t;
557 tree binfo = TREE_VALUE (t);
561 build_tree_list (NULL_TREE,
562 build_base_path (PLUS_EXPR, parm,
567 for (i = 0; i < n_bases; ++i)
569 tree binfo = TREE_VEC_ELT (binfos, i);
570 if (TREE_VIA_VIRTUAL (binfo))
575 build_tree_list (NULL_TREE,
576 build_base_path (PLUS_EXPR, parm,
581 for (; fields; fields = TREE_CHAIN (fields))
587 if (TREE_CODE (field) != FIELD_DECL)
591 if (DECL_NAME (field))
593 if (VFIELD_NAME_P (DECL_NAME (field)))
596 /* True for duplicate members. */
597 if (IDENTIFIER_CLASS_VALUE (DECL_NAME (field)) != field)
600 else if ((t = TREE_TYPE (field)) != NULL_TREE
601 && ANON_AGGR_TYPE_P (t)
602 && TYPE_FIELDS (t) != NULL_TREE)
603 /* Just use the field; anonymous types can't have
604 nontrivial copy ctors or assignment ops. */;
608 /* Compute the type of "init->field". If the copy-constructor
609 parameter is, for example, "const S&", and the type of
610 the field is "T", then the type will usually be "const
611 T". (There are no cv-qualified variants of reference
613 expr_type = TREE_TYPE (field);
614 if (TREE_CODE (expr_type) != REFERENCE_TYPE)
615 expr_type = cp_build_qualified_type (expr_type, cvquals);
616 init = build (COMPONENT_REF, expr_type, init, field);
617 init = build_tree_list (NULL_TREE, init);
620 = tree_cons (field, init, member_init_list);
622 finish_mem_initializers (member_init_list);
627 do_build_assign_ref (tree fndecl)
629 tree parm = TREE_CHAIN (DECL_ARGUMENTS (fndecl));
632 compound_stmt = begin_compound_stmt (/*has_no_scope=*/false);
633 parm = convert_from_reference (parm);
635 if (TYPE_HAS_TRIVIAL_ASSIGN_REF (current_class_type)
636 && is_empty_class (current_class_type))
637 /* Don't copy the padding byte; it might not have been allocated
638 if *this is a base subobject. */;
639 else if (TYPE_HAS_TRIVIAL_ASSIGN_REF (current_class_type))
641 tree t = build (MODIFY_EXPR, void_type_node, current_class_ref, parm);
642 finish_expr_stmt (t);
647 int cvquals = cp_type_quals (TREE_TYPE (parm));
650 /* Assign to each of the direct base classes. */
651 for (i = 0; i < CLASSTYPE_N_BASECLASSES (current_class_type); ++i)
656 binfo = BINFO_BASETYPE (TYPE_BINFO (current_class_type), i);
657 /* We must convert PARM directly to the base class
658 explicitly since the base class may be ambiguous. */
659 converted_parm = build_base_path (PLUS_EXPR, parm, binfo, 1);
660 /* Call the base class assignment operator. */
662 (build_special_member_call (current_class_ref,
663 ansi_assopname (NOP_EXPR),
664 build_tree_list (NULL_TREE,
667 LOOKUP_NORMAL | LOOKUP_NONVIRTUAL));
670 /* Assign to each of the non-static data members. */
671 for (fields = TYPE_FIELDS (current_class_type);
673 fields = TREE_CHAIN (fields))
678 if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field))
681 if (CP_TYPE_CONST_P (TREE_TYPE (field)))
683 error ("non-static const member `%#D', can't use default assignment operator", field);
686 else if (TREE_CODE (TREE_TYPE (field)) == REFERENCE_TYPE)
688 error ("non-static reference member `%#D', can't use default assignment operator", field);
692 comp = current_class_ref;
695 if (DECL_NAME (field))
697 if (VFIELD_NAME_P (DECL_NAME (field)))
700 /* True for duplicate members. */
701 if (IDENTIFIER_CLASS_VALUE (DECL_NAME (field)) != field)
704 else if ((t = TREE_TYPE (field)) != NULL_TREE
705 && ANON_AGGR_TYPE_P (t)
706 && TYPE_FIELDS (t) != NULL_TREE)
707 /* Just use the field; anonymous types can't have
708 nontrivial copy ctors or assignment ops. */;
712 comp = build (COMPONENT_REF, TREE_TYPE (field), comp, field);
713 init = build (COMPONENT_REF,
714 cp_build_qualified_type (TREE_TYPE (field), cvquals),
717 if (DECL_NAME (field))
718 finish_expr_stmt (build_modify_expr (comp, NOP_EXPR, init));
720 finish_expr_stmt (build (MODIFY_EXPR, TREE_TYPE (comp), comp,
724 finish_return_stmt (current_class_ref);
725 finish_compound_stmt (compound_stmt);
729 synthesize_method (tree fndecl)
731 bool nested = (current_function_decl != NULL_TREE);
732 tree context = decl_function_context (fndecl);
733 bool need_body = true;
737 import_export_decl (fndecl);
739 /* If we've been asked to synthesize a clone, just synthesize the
740 cloned function instead. Doing so will automatically fill in the
741 body for the clone. */
742 if (DECL_CLONED_FUNCTION_P (fndecl))
744 synthesize_method (DECL_CLONED_FUNCTION (fndecl));
748 /* We may be in the middle of deferred access check. Disable
750 push_deferring_access_checks (dk_no_deferred);
753 push_to_top_level ();
755 push_function_context_to (context);
757 /* Put the function definition at the position where it is needed,
758 rather than within the body of the class. That way, an error
759 during the generation of the implicit body points at the place
760 where the attempt to generate the function occurs, giving the
761 user a hint as to why we are attempting to generate the
763 DECL_SOURCE_LOCATION (fndecl) = input_location;
765 interface_unknown = 1;
766 start_function (NULL_TREE, fndecl, NULL_TREE, SF_DEFAULT | SF_PRE_PARSED);
768 stmt = begin_function_body ();
770 if (DECL_OVERLOADED_OPERATOR_P (fndecl) == NOP_EXPR)
772 do_build_assign_ref (fndecl);
775 else if (DECL_CONSTRUCTOR_P (fndecl))
777 tree arg_chain = FUNCTION_FIRST_USER_PARMTYPE (fndecl);
778 if (arg_chain != void_list_node)
779 do_build_copy_constructor (fndecl);
780 else if (TYPE_NEEDS_CONSTRUCTING (current_class_type))
781 finish_mem_initializers (NULL_TREE);
784 /* If we haven't yet generated the body of the function, just
785 generate an empty compound statement. */
789 compound_stmt = begin_compound_stmt (/*has_no_scope=*/false);
790 finish_compound_stmt (compound_stmt);
793 finish_function_body (stmt);
794 expand_or_defer_fn (finish_function (0));
796 extract_interface_info ();
798 pop_from_top_level ();
800 pop_function_context_from (context);
802 pop_deferring_access_checks ();
805 /* Use EXTRACTOR to locate the relevant function called for each base &
806 class field of TYPE. CLIENT allows additional information to be passed
807 to EXTRACTOR. Generates the union of all exceptions generated by those
808 functions. Note that we haven't updated TYPE_FIELDS and such of any
809 variants yet, so we need to look at the main one. */
812 synthesize_exception_spec (tree type, tree (*extractor) (tree, void*),
815 tree raises = empty_except_spec;
816 tree fields = TYPE_FIELDS (type);
817 int i, n_bases = CLASSTYPE_N_BASECLASSES (type);
818 tree binfos = TYPE_BINFO_BASETYPES (type);
820 for (i = 0; i != n_bases; i++)
822 tree base = BINFO_TYPE (TREE_VEC_ELT (binfos, i));
823 tree fn = (*extractor) (base, client);
826 tree fn_raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn));
828 raises = merge_exception_specifiers (raises, fn_raises);
831 for (; fields; fields = TREE_CHAIN (fields))
833 tree type = TREE_TYPE (fields);
836 if (TREE_CODE (fields) != FIELD_DECL || DECL_ARTIFICIAL (fields))
838 while (TREE_CODE (type) == ARRAY_TYPE)
839 type = TREE_TYPE (type);
840 if (TREE_CODE (type) != RECORD_TYPE)
843 fn = (*extractor) (type, client);
846 tree fn_raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn));
848 raises = merge_exception_specifiers (raises, fn_raises);
854 /* Locate the dtor of TYPE. */
857 locate_dtor (tree type, void *client ATTRIBUTE_UNUSED)
861 if (!TYPE_HAS_DESTRUCTOR (type))
863 fns = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type),
864 CLASSTYPE_DESTRUCTOR_SLOT);
868 /* Locate the default ctor of TYPE. */
871 locate_ctor (tree type, void *client ATTRIBUTE_UNUSED)
875 if (!TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
878 fns = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type),
879 CLASSTYPE_CONSTRUCTOR_SLOT);
880 for (; fns; fns = OVL_NEXT (fns))
882 tree fn = OVL_CURRENT (fns);
883 tree parms = TYPE_ARG_TYPES (TREE_TYPE (fn));
885 if (sufficient_parms_p (TREE_CHAIN (parms)))
897 /* Locate the copy ctor or copy assignment of TYPE. CLIENT_
898 points to a COPY_DATA holding the name (NULL for the ctor)
899 and desired qualifiers of the source operand. */
902 locate_copy (tree type, void *client_)
904 struct copy_data *client = (struct copy_data *)client_;
907 tree best = NULL_TREE;
908 bool excess_p = false;
912 if (TYPE_HAS_ASSIGN_REF (type))
913 ix = lookup_fnfields_1 (type, client->name);
915 else if (TYPE_HAS_INIT_REF (type))
916 ix = CLASSTYPE_CONSTRUCTOR_SLOT;
919 fns = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), ix);
921 for (; fns; fns = OVL_NEXT (fns))
923 tree fn = OVL_CURRENT (fns);
924 tree parms = TYPE_ARG_TYPES (TREE_TYPE (fn));
929 parms = TREE_CHAIN (parms);
932 src_type = non_reference (TREE_VALUE (parms));
933 if (!same_type_ignoring_top_level_qualifiers_p (src_type, type))
935 if (!sufficient_parms_p (TREE_CHAIN (parms)))
937 quals = cp_type_quals (src_type);
938 if (client->quals & ~quals)
940 excess = quals & ~client->quals;
941 if (!best || (excess_p && !excess))
953 /* Implicitly declare the special function indicated by KIND, as a
954 member of TYPE. For copy constructors and assignment operators,
955 CONST_P indicates whether these functions should take a const
956 reference argument or a non-const reference. */
959 implicitly_declare_fn (special_function_kind kind, tree type, bool const_p)
961 tree declspecs = NULL_TREE;
962 tree fn, args = NULL_TREE;
963 tree raises = empty_except_spec;
965 bool has_parm = false;
966 tree name = constructor_name (type);
972 name = build_nt (BIT_NOT_EXPR, name);
973 args = void_list_node;
974 raises = synthesize_exception_spec (type, &locate_dtor, 0);
977 case sfk_constructor:
978 /* Default constructor. */
979 args = void_list_node;
980 raises = synthesize_exception_spec (type, &locate_ctor, 0);
983 case sfk_copy_constructor:
984 case sfk_assignment_operator:
986 struct copy_data data;
992 if (kind == sfk_assignment_operator)
995 declspecs = build_tree_list (NULL_TREE, type);
997 name = ansi_assopname (NOP_EXPR);
1002 data.quals = TYPE_QUAL_CONST;
1003 argtype = build_qualified_type (argtype, TYPE_QUAL_CONST);
1006 argtype = build_reference_type (argtype);
1007 args = build_tree_list (hash_tree_chain (argtype, NULL_TREE),
1008 get_identifier ("_ctor_arg"));
1009 args = tree_cons (NULL_TREE, args, void_list_node);
1011 raises = synthesize_exception_spec (type, &locate_copy, &data);
1018 TREE_PARMLIST (args) = 1;
1021 tree declarator = make_call_declarator (name, args, NULL_TREE, raises);
1024 declarator = build_nt (ADDR_EXPR, declarator);
1026 fn = grokfield (declarator, declspecs, NULL_TREE, NULL_TREE, NULL_TREE);
1028 TREE_USED (FUNCTION_FIRST_USER_PARM (fn)) = 1;
1031 my_friendly_assert (TREE_CODE (fn) == FUNCTION_DECL, 20000408);
1033 DECL_ARTIFICIAL (fn) = 1;
1034 DECL_NOT_REALLY_EXTERN (fn) = 1;
1035 DECL_DECLARED_INLINE_P (fn) = 1;
1036 DECL_INLINE (fn) = 1;
1042 /* Given a FUNCTION_DECL FN and a chain LIST, skip as many elements of LIST
1043 as there are artificial parms in FN. */
1046 skip_artificial_parms_for (tree fn, tree list)
1048 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn))
1049 list = TREE_CHAIN (list);
1053 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
1054 list = TREE_CHAIN (list);
1055 if (DECL_HAS_VTT_PARM_P (fn))
1056 list = TREE_CHAIN (list);
1060 #include "gt-cp-method.h"