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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [cp/] [method.c] - Rev 838
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/* Handle the hair of processing (but not expanding) inline functions. Also manage function and variable name overloading. Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc. Contributed by Michael Tiemann (tiemann@cygnus.com) This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ /* Handle method declarations. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "cp-tree.h" #include "rtl.h" #include "expr.h" #include "output.h" #include "flags.h" #include "toplev.h" #include "tm_p.h" #include "target.h" #include "tree-pass.h" #include "diagnostic.h" #include "cgraph.h" #include "gimple.h" /* Various flags to control the mangling process. */ enum mangling_flags { /* No flags. */ mf_none = 0, /* The thing we are presently mangling is part of a template type, rather than a fully instantiated type. Therefore, we may see complex expressions where we would normally expect to see a simple integer constant. */ mf_maybe_uninstantiated = 1, /* When mangling a numeric value, use the form `_XX_' (instead of just `XX') if the value has more than one digit. */ mf_use_underscores_around_value = 2 }; typedef enum mangling_flags mangling_flags; static void do_build_assign_ref (tree); static void do_build_copy_constructor (tree); static tree synthesize_exception_spec (tree, tree (*) (tree, void *), void *); static tree make_alias_for_thunk (tree); /* Called once to initialize method.c. */ void init_method (void) { init_mangle (); } /* Return a this or result adjusting thunk to FUNCTION. THIS_ADJUSTING indicates whether it is a this or result adjusting thunk. FIXED_OFFSET and VIRTUAL_OFFSET indicate how to do the adjustment (see thunk_adjust). VIRTUAL_OFFSET can be NULL, but FIXED_OFFSET never is. VIRTUAL_OFFSET is the /index/ into the vtable for this adjusting thunks, we scale it to a byte offset. For covariant thunks VIRTUAL_OFFSET is the virtual binfo. You must post process the returned thunk with finish_thunk. */ tree make_thunk (tree function, bool this_adjusting, tree fixed_offset, tree virtual_offset) { HOST_WIDE_INT d; tree thunk; gcc_assert (TREE_CODE (function) == FUNCTION_DECL); /* We can have this thunks to covariant thunks, but not vice versa. */ gcc_assert (!DECL_THIS_THUNK_P (function)); gcc_assert (!DECL_RESULT_THUNK_P (function) || this_adjusting); /* Scale the VIRTUAL_OFFSET to be in terms of bytes. */ if (this_adjusting && virtual_offset) virtual_offset = size_binop (MULT_EXPR, virtual_offset, convert (ssizetype, TYPE_SIZE_UNIT (vtable_entry_type))); d = tree_low_cst (fixed_offset, 0); /* See if we already have the thunk in question. For this_adjusting thunks VIRTUAL_OFFSET will be an INTEGER_CST, for covariant thunks it will be a BINFO. */ for (thunk = DECL_THUNKS (function); thunk; thunk = TREE_CHAIN (thunk)) if (DECL_THIS_THUNK_P (thunk) == this_adjusting && THUNK_FIXED_OFFSET (thunk) == d && !virtual_offset == !THUNK_VIRTUAL_OFFSET (thunk) && (!virtual_offset || (this_adjusting ? tree_int_cst_equal (THUNK_VIRTUAL_OFFSET (thunk), virtual_offset) : THUNK_VIRTUAL_OFFSET (thunk) == virtual_offset))) return thunk; /* All thunks must be created before FUNCTION is actually emitted; the ABI requires that all thunks be emitted together with the function to which they transfer control. */ gcc_assert (!TREE_ASM_WRITTEN (function)); /* Likewise, we can only be adding thunks to a function declared in the class currently being laid out. */ gcc_assert (TYPE_SIZE (DECL_CONTEXT (function)) && TYPE_BEING_DEFINED (DECL_CONTEXT (function))); thunk = build_decl (DECL_SOURCE_LOCATION (function), FUNCTION_DECL, NULL_TREE, TREE_TYPE (function)); DECL_LANG_SPECIFIC (thunk) = DECL_LANG_SPECIFIC (function); cxx_dup_lang_specific_decl (thunk); DECL_THUNKS (thunk) = NULL_TREE; DECL_CONTEXT (thunk) = DECL_CONTEXT (function); TREE_READONLY (thunk) = TREE_READONLY (function); TREE_THIS_VOLATILE (thunk) = TREE_THIS_VOLATILE (function); TREE_PUBLIC (thunk) = TREE_PUBLIC (function); SET_DECL_THUNK_P (thunk, this_adjusting); THUNK_TARGET (thunk) = function; THUNK_FIXED_OFFSET (thunk) = d; THUNK_VIRTUAL_OFFSET (thunk) = virtual_offset; THUNK_ALIAS (thunk) = NULL_TREE; /* The thunk itself is not a constructor or destructor, even if the thing it is thunking to is. */ DECL_INTERFACE_KNOWN (thunk) = 1; DECL_NOT_REALLY_EXTERN (thunk) = 1; DECL_SAVED_FUNCTION_DATA (thunk) = NULL; DECL_DESTRUCTOR_P (thunk) = 0; DECL_CONSTRUCTOR_P (thunk) = 0; DECL_EXTERNAL (thunk) = 1; DECL_ARTIFICIAL (thunk) = 1; /* The THUNK is not a pending inline, even if the FUNCTION is. */ DECL_PENDING_INLINE_P (thunk) = 0; DECL_DECLARED_INLINE_P (thunk) = 0; /* Nor is it a template instantiation. */ DECL_USE_TEMPLATE (thunk) = 0; DECL_TEMPLATE_INFO (thunk) = NULL; /* Add it to the list of thunks associated with FUNCTION. */ TREE_CHAIN (thunk) = DECL_THUNKS (function); DECL_THUNKS (function) = thunk; return thunk; } /* Finish THUNK, a thunk decl. */ void finish_thunk (tree thunk) { tree function, name; tree fixed_offset = ssize_int (THUNK_FIXED_OFFSET (thunk)); tree virtual_offset = THUNK_VIRTUAL_OFFSET (thunk); gcc_assert (!DECL_NAME (thunk) && DECL_THUNK_P (thunk)); if (virtual_offset && DECL_RESULT_THUNK_P (thunk)) virtual_offset = BINFO_VPTR_FIELD (virtual_offset); function = THUNK_TARGET (thunk); name = mangle_thunk (function, DECL_THIS_THUNK_P (thunk), fixed_offset, virtual_offset); /* We can end up with declarations of (logically) different covariant thunks, that do identical adjustments. The two thunks will be adjusting between within different hierarchies, which happen to have the same layout. We must nullify one of them to refer to the other. */ if (DECL_RESULT_THUNK_P (thunk)) { tree cov_probe; for (cov_probe = DECL_THUNKS (function); cov_probe; cov_probe = TREE_CHAIN (cov_probe)) if (DECL_NAME (cov_probe) == name) { gcc_assert (!DECL_THUNKS (thunk)); THUNK_ALIAS (thunk) = (THUNK_ALIAS (cov_probe) ? THUNK_ALIAS (cov_probe) : cov_probe); break; } } DECL_NAME (thunk) = name; SET_DECL_ASSEMBLER_NAME (thunk, name); } static GTY (()) int thunk_labelno; /* Create a static alias to target. */ tree make_alias_for (tree target, tree newid) { tree alias = build_decl (DECL_SOURCE_LOCATION (target), TREE_CODE (target), newid, TREE_TYPE (target)); DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (target); cxx_dup_lang_specific_decl (alias); DECL_CONTEXT (alias) = NULL; TREE_READONLY (alias) = TREE_READONLY (target); TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (target); TREE_PUBLIC (alias) = 0; DECL_INTERFACE_KNOWN (alias) = 1; if (DECL_LANG_SPECIFIC (alias)) { DECL_NOT_REALLY_EXTERN (alias) = 1; DECL_USE_TEMPLATE (alias) = 0; DECL_TEMPLATE_INFO (alias) = NULL; } DECL_EXTERNAL (alias) = 0; DECL_ARTIFICIAL (alias) = 1; DECL_TEMPLATE_INSTANTIATED (alias) = 0; if (TREE_CODE (alias) == FUNCTION_DECL) { DECL_SAVED_FUNCTION_DATA (alias) = NULL; DECL_DESTRUCTOR_P (alias) = 0; DECL_CONSTRUCTOR_P (alias) = 0; DECL_PENDING_INLINE_P (alias) = 0; DECL_DECLARED_INLINE_P (alias) = 0; DECL_INITIAL (alias) = error_mark_node; DECL_ARGUMENTS (alias) = copy_list (DECL_ARGUMENTS (target)); } else TREE_STATIC (alias) = 1; TREE_ADDRESSABLE (alias) = 1; TREE_USED (alias) = 1; SET_DECL_ASSEMBLER_NAME (alias, DECL_NAME (alias)); TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias)) = 1; return alias; } static tree make_alias_for_thunk (tree function) { tree alias; char buf[256]; ASM_GENERATE_INTERNAL_LABEL (buf, "LTHUNK", thunk_labelno); thunk_labelno++; alias = make_alias_for (function, get_identifier (buf)); if (!flag_syntax_only) { bool ok = cgraph_same_body_alias (alias, function); DECL_ASSEMBLER_NAME (function); gcc_assert (ok); } return alias; } /* Emit the definition of a C++ multiple inheritance or covariant return vtable thunk. If EMIT_P is nonzero, the thunk is emitted immediately. */ void use_thunk (tree thunk_fndecl, bool emit_p) { tree a, t, function, alias; tree virtual_offset; HOST_WIDE_INT fixed_offset, virtual_value; bool this_adjusting = DECL_THIS_THUNK_P (thunk_fndecl); /* We should have called finish_thunk to give it a name. */ gcc_assert (DECL_NAME (thunk_fndecl)); /* We should never be using an alias, always refer to the aliased thunk. */ gcc_assert (!THUNK_ALIAS (thunk_fndecl)); if (TREE_ASM_WRITTEN (thunk_fndecl)) return; function = THUNK_TARGET (thunk_fndecl); if (DECL_RESULT (thunk_fndecl)) /* We already turned this thunk into an ordinary function. There's no need to process this thunk again. */ return; if (DECL_THUNK_P (function)) /* The target is itself a thunk, process it now. */ use_thunk (function, emit_p); /* Thunks are always addressable; they only appear in vtables. */ TREE_ADDRESSABLE (thunk_fndecl) = 1; /* Figure out what function is being thunked to. It's referenced in this translation unit. */ TREE_ADDRESSABLE (function) = 1; mark_used (function); if (!emit_p) return; if (TARGET_USE_LOCAL_THUNK_ALIAS_P (function)) alias = make_alias_for_thunk (function); else alias = function; fixed_offset = THUNK_FIXED_OFFSET (thunk_fndecl); virtual_offset = THUNK_VIRTUAL_OFFSET (thunk_fndecl); if (virtual_offset) { if (!this_adjusting) virtual_offset = BINFO_VPTR_FIELD (virtual_offset); virtual_value = tree_low_cst (virtual_offset, /*pos=*/0); gcc_assert (virtual_value); } else virtual_value = 0; /* And, if we need to emit the thunk, it's used. */ mark_used (thunk_fndecl); /* This thunk is actually defined. */ DECL_EXTERNAL (thunk_fndecl) = 0; /* The linkage of the function may have changed. FIXME in linkage rewrite. */ TREE_PUBLIC (thunk_fndecl) = TREE_PUBLIC (function); DECL_VISIBILITY (thunk_fndecl) = DECL_VISIBILITY (function); DECL_VISIBILITY_SPECIFIED (thunk_fndecl) = DECL_VISIBILITY_SPECIFIED (function); if (DECL_ONE_ONLY (function) || DECL_WEAK (function)) make_decl_one_only (thunk_fndecl, cxx_comdat_group (thunk_fndecl)); if (flag_syntax_only) { TREE_ASM_WRITTEN (thunk_fndecl) = 1; return; } push_to_top_level (); if (TARGET_USE_LOCAL_THUNK_ALIAS_P (function) && targetm.have_named_sections) { resolve_unique_section (function, 0, flag_function_sections); if (DECL_SECTION_NAME (function) != NULL && DECL_ONE_ONLY (function)) { resolve_unique_section (thunk_fndecl, 0, flag_function_sections); /* Output the thunk into the same section as function. */ DECL_SECTION_NAME (thunk_fndecl) = DECL_SECTION_NAME (function); } } /* Set up cloned argument trees for the thunk. */ t = NULL_TREE; for (a = DECL_ARGUMENTS (function); a; a = TREE_CHAIN (a)) { tree x = copy_node (a); TREE_CHAIN (x) = t; DECL_CONTEXT (x) = thunk_fndecl; SET_DECL_RTL (x, NULL_RTX); DECL_HAS_VALUE_EXPR_P (x) = 0; t = x; } a = nreverse (t); DECL_ARGUMENTS (thunk_fndecl) = a; TREE_ASM_WRITTEN (thunk_fndecl) = 1; cgraph_add_thunk (thunk_fndecl, function, this_adjusting, fixed_offset, virtual_value, virtual_offset, alias); if (!this_adjusting || !targetm.asm_out.can_output_mi_thunk (thunk_fndecl, fixed_offset, virtual_value, alias)) { /* If this is a covariant thunk, or we don't have the necessary code for efficient thunks, generate a thunk function that just makes a call to the real function. Unfortunately, this doesn't work for varargs. */ if (varargs_function_p (function)) error ("generic thunk code fails for method %q#D which uses %<...%>", function); } pop_from_top_level (); } /* Code for synthesizing methods which have default semantics defined. */ /* Generate code for default X(X&) or X(X&&) constructor. */ static void do_build_copy_constructor (tree fndecl) { tree parm = FUNCTION_FIRST_USER_PARM (fndecl); bool move_p = DECL_MOVE_CONSTRUCTOR_P (fndecl); parm = convert_from_reference (parm); if (TYPE_HAS_TRIVIAL_INIT_REF (current_class_type) && is_empty_class (current_class_type)) /* Don't copy the padding byte; it might not have been allocated if *this is a base subobject. */; else if (TYPE_HAS_TRIVIAL_INIT_REF (current_class_type)) { tree t = build2 (INIT_EXPR, void_type_node, current_class_ref, parm); finish_expr_stmt (t); } else { tree fields = TYPE_FIELDS (current_class_type); tree member_init_list = NULL_TREE; int cvquals = cp_type_quals (TREE_TYPE (parm)); int i; tree binfo, base_binfo; tree init; VEC(tree,gc) *vbases; /* Initialize all the base-classes with the parameter converted to their type so that we get their copy constructor and not another constructor that takes current_class_type. We must deal with the binfo's directly as a direct base might be inaccessible due to ambiguity. */ for (vbases = CLASSTYPE_VBASECLASSES (current_class_type), i = 0; VEC_iterate (tree, vbases, i, binfo); i++) { init = build_base_path (PLUS_EXPR, parm, binfo, 1); if (move_p) init = move (init); member_init_list = tree_cons (binfo, build_tree_list (NULL_TREE, init), member_init_list); } for (binfo = TYPE_BINFO (current_class_type), i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) { if (BINFO_VIRTUAL_P (base_binfo)) continue; init = build_base_path (PLUS_EXPR, parm, base_binfo, 1); if (move_p) init = move (init); member_init_list = tree_cons (base_binfo, build_tree_list (NULL_TREE, init), member_init_list); } for (; fields; fields = TREE_CHAIN (fields)) { tree field = fields; tree expr_type; if (TREE_CODE (field) != FIELD_DECL) continue; expr_type = TREE_TYPE (field); if (DECL_NAME (field)) { if (VFIELD_NAME_P (DECL_NAME (field))) continue; } else if (ANON_AGGR_TYPE_P (expr_type) && TYPE_FIELDS (expr_type)) /* Just use the field; anonymous types can't have nontrivial copy ctors or assignment ops. */; else continue; /* Compute the type of "init->field". If the copy-constructor parameter is, for example, "const S&", and the type of the field is "T", then the type will usually be "const T". (There are no cv-qualified variants of reference types.) */ if (TREE_CODE (expr_type) != REFERENCE_TYPE) { int quals = cvquals; if (DECL_MUTABLE_P (field)) quals &= ~TYPE_QUAL_CONST; quals |= TYPE_QUALS (expr_type); expr_type = cp_build_qualified_type (expr_type, quals); } init = build3 (COMPONENT_REF, expr_type, parm, field, NULL_TREE); if (move_p && TREE_CODE (expr_type) != REFERENCE_TYPE) init = move (init); init = build_tree_list (NULL_TREE, init); member_init_list = tree_cons (field, init, member_init_list); } finish_mem_initializers (member_init_list); } } static void do_build_assign_ref (tree fndecl) { tree parm = TREE_CHAIN (DECL_ARGUMENTS (fndecl)); tree compound_stmt; compound_stmt = begin_compound_stmt (0); parm = convert_from_reference (parm); if (TYPE_HAS_TRIVIAL_ASSIGN_REF (current_class_type) && is_empty_class (current_class_type)) /* Don't copy the padding byte; it might not have been allocated if *this is a base subobject. */; else if (TYPE_HAS_TRIVIAL_ASSIGN_REF (current_class_type)) { tree t = build2 (MODIFY_EXPR, void_type_node, current_class_ref, parm); finish_expr_stmt (t); } else { tree fields; int cvquals = cp_type_quals (TREE_TYPE (parm)); int i; tree binfo, base_binfo; /* Assign to each of the direct base classes. */ for (binfo = TYPE_BINFO (current_class_type), i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) { tree converted_parm; VEC(tree,gc) *parmvec; /* We must convert PARM directly to the base class explicitly since the base class may be ambiguous. */ converted_parm = build_base_path (PLUS_EXPR, parm, base_binfo, 1); /* Call the base class assignment operator. */ parmvec = make_tree_vector_single (converted_parm); finish_expr_stmt (build_special_member_call (current_class_ref, ansi_assopname (NOP_EXPR), &parmvec, base_binfo, LOOKUP_NORMAL | LOOKUP_NONVIRTUAL, tf_warning_or_error)); release_tree_vector (parmvec); } /* Assign to each of the non-static data members. */ for (fields = TYPE_FIELDS (current_class_type); fields; fields = TREE_CHAIN (fields)) { tree comp = current_class_ref; tree init = parm; tree field = fields; tree expr_type; int quals; if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field)) continue; expr_type = TREE_TYPE (field); if (CP_TYPE_CONST_P (expr_type)) { error ("non-static const member %q#D, can't use default " "assignment operator", field); continue; } else if (TREE_CODE (expr_type) == REFERENCE_TYPE) { error ("non-static reference member %q#D, can't use " "default assignment operator", field); continue; } if (DECL_NAME (field)) { if (VFIELD_NAME_P (DECL_NAME (field))) continue; } else if (ANON_AGGR_TYPE_P (expr_type) && TYPE_FIELDS (expr_type) != NULL_TREE) /* Just use the field; anonymous types can't have nontrivial copy ctors or assignment ops. */; else continue; comp = build3 (COMPONENT_REF, expr_type, comp, field, NULL_TREE); /* Compute the type of init->field */ quals = cvquals; if (DECL_MUTABLE_P (field)) quals &= ~TYPE_QUAL_CONST; expr_type = cp_build_qualified_type (expr_type, quals); init = build3 (COMPONENT_REF, expr_type, init, field, NULL_TREE); if (DECL_NAME (field)) init = cp_build_modify_expr (comp, NOP_EXPR, init, tf_warning_or_error); else init = build2 (MODIFY_EXPR, TREE_TYPE (comp), comp, init); finish_expr_stmt (init); } } finish_return_stmt (current_class_ref); finish_compound_stmt (compound_stmt); } /* Synthesize FNDECL, a non-static member function. */ void synthesize_method (tree fndecl) { bool nested = (current_function_decl != NULL_TREE); tree context = decl_function_context (fndecl); bool need_body = true; tree stmt; location_t save_input_location = input_location; int error_count = errorcount; int warning_count = warningcount; /* Reset the source location, we might have been previously deferred, and thus have saved where we were first needed. */ DECL_SOURCE_LOCATION (fndecl) = DECL_SOURCE_LOCATION (TYPE_NAME (DECL_CONTEXT (fndecl))); /* If we've been asked to synthesize a clone, just synthesize the cloned function instead. Doing so will automatically fill in the body for the clone. */ if (DECL_CLONED_FUNCTION_P (fndecl)) fndecl = DECL_CLONED_FUNCTION (fndecl); /* We may be in the middle of deferred access check. Disable it now. */ push_deferring_access_checks (dk_no_deferred); if (! context) push_to_top_level (); else if (nested) push_function_context (); input_location = DECL_SOURCE_LOCATION (fndecl); start_preparsed_function (fndecl, NULL_TREE, SF_DEFAULT | SF_PRE_PARSED); stmt = begin_function_body (); if (DECL_OVERLOADED_OPERATOR_P (fndecl) == NOP_EXPR) { do_build_assign_ref (fndecl); need_body = false; } else if (DECL_CONSTRUCTOR_P (fndecl)) { tree arg_chain = FUNCTION_FIRST_USER_PARMTYPE (fndecl); if (arg_chain != void_list_node) do_build_copy_constructor (fndecl); else finish_mem_initializers (NULL_TREE); } /* If we haven't yet generated the body of the function, just generate an empty compound statement. */ if (need_body) { tree compound_stmt; compound_stmt = begin_compound_stmt (BCS_FN_BODY); finish_compound_stmt (compound_stmt); } finish_function_body (stmt); expand_or_defer_fn (finish_function (0)); input_location = save_input_location; if (! context) pop_from_top_level (); else if (nested) pop_function_context (); pop_deferring_access_checks (); if (error_count != errorcount || warning_count != warningcount) inform (input_location, "synthesized method %qD first required here ", fndecl); } /* Use EXTRACTOR to locate the relevant function called for each base & class field of TYPE. CLIENT allows additional information to be passed to EXTRACTOR. Generates the union of all exceptions generated by those functions. Note that we haven't updated TYPE_FIELDS and such of any variants yet, so we need to look at the main one. */ static tree synthesize_exception_spec (tree type, tree (*extractor) (tree, void*), void *client) { tree raises = empty_except_spec; tree fields = TYPE_FIELDS (type); tree binfo, base_binfo; int i; for (binfo = TYPE_BINFO (type), i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) { tree fn = (*extractor) (BINFO_TYPE (base_binfo), client); if (fn) { tree fn_raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)); raises = merge_exception_specifiers (raises, fn_raises); } } for (; fields; fields = TREE_CHAIN (fields)) { tree type = TREE_TYPE (fields); tree fn; if (TREE_CODE (fields) != FIELD_DECL || DECL_ARTIFICIAL (fields)) continue; while (TREE_CODE (type) == ARRAY_TYPE) type = TREE_TYPE (type); if (!CLASS_TYPE_P (type)) continue; fn = (*extractor) (type, client); if (fn) { tree fn_raises = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)); raises = merge_exception_specifiers (raises, fn_raises); } } return raises; } /* Locate the dtor of TYPE. */ tree locate_dtor (tree type, void *client ATTRIBUTE_UNUSED) { return CLASSTYPE_DESTRUCTORS (type); } /* Locate the default ctor of TYPE. */ tree locate_ctor (tree type, void *client ATTRIBUTE_UNUSED) { tree fns; if (!TYPE_HAS_DEFAULT_CONSTRUCTOR (type)) return NULL_TREE; /* Call lookup_fnfields_1 to create the constructor declarations, if necessary. */ if (CLASSTYPE_LAZY_DEFAULT_CTOR (type)) return lazily_declare_fn (sfk_constructor, type); for (fns = CLASSTYPE_CONSTRUCTORS (type); fns; fns = OVL_NEXT (fns)) { tree fn = OVL_CURRENT (fns); tree parms = TYPE_ARG_TYPES (TREE_TYPE (fn)); parms = skip_artificial_parms_for (fn, parms); if (sufficient_parms_p (parms)) return fn; } gcc_unreachable (); } struct copy_data { tree name; int quals; }; /* Locate the copy ctor or copy assignment of TYPE. CLIENT_ points to a COPY_DATA holding the name (NULL for the ctor) and desired qualifiers of the source operand. */ tree locate_copy (tree type, void *client_) { struct copy_data *client = (struct copy_data *)client_; tree fns; tree best = NULL_TREE; bool excess_p = false; if (client->name) { int ix; ix = lookup_fnfields_1 (type, client->name); if (ix < 0) return NULL_TREE; fns = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), ix); } else if (TYPE_HAS_INIT_REF (type)) { /* If construction of the copy constructor was postponed, create it now. */ if (CLASSTYPE_LAZY_COPY_CTOR (type)) lazily_declare_fn (sfk_copy_constructor, type); if (CLASSTYPE_LAZY_MOVE_CTOR (type)) lazily_declare_fn (sfk_move_constructor, type); fns = CLASSTYPE_CONSTRUCTORS (type); } else return NULL_TREE; for (; fns; fns = OVL_NEXT (fns)) { tree fn = OVL_CURRENT (fns); tree parms = TYPE_ARG_TYPES (TREE_TYPE (fn)); tree src_type; int excess; int quals; parms = skip_artificial_parms_for (fn, parms); if (!parms) continue; src_type = non_reference (TREE_VALUE (parms)); if (src_type == error_mark_node) return NULL_TREE; if (!same_type_ignoring_top_level_qualifiers_p (src_type, type)) continue; if (!sufficient_parms_p (TREE_CHAIN (parms))) continue; quals = cp_type_quals (src_type); if (client->quals & ~quals) continue; excess = quals & ~client->quals; if (!best || (excess_p && !excess)) { best = fn; excess_p = excess; } else /* Ambiguous */ return NULL_TREE; } return best; } /* Implicitly declare the special function indicated by KIND, as a member of TYPE. For copy constructors and assignment operators, CONST_P indicates whether these functions should take a const reference argument or a non-const reference. Returns the FUNCTION_DECL for the implicitly declared function. */ static tree implicitly_declare_fn (special_function_kind kind, tree type, bool const_p) { tree fn; tree parameter_types = void_list_node; tree return_type; tree fn_type; tree raises = empty_except_spec; tree rhs_parm_type = NULL_TREE; tree this_parm; tree name; HOST_WIDE_INT saved_processing_template_decl; /* Because we create declarations for implicitly declared functions lazily, we may be creating the declaration for a member of TYPE while in some completely different context. However, TYPE will never be a dependent class (because we never want to do lookups for implicitly defined functions in a dependent class). Furthermore, we must set PROCESSING_TEMPLATE_DECL to zero here because we only create clones for constructors and destructors when not in a template. */ gcc_assert (!dependent_type_p (type)); saved_processing_template_decl = processing_template_decl; processing_template_decl = 0; type = TYPE_MAIN_VARIANT (type); if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (type)) { if (kind == sfk_destructor) /* See comment in check_special_function_return_type. */ return_type = build_pointer_type (void_type_node); else return_type = build_pointer_type (type); } else return_type = void_type_node; switch (kind) { case sfk_destructor: /* Destructor. */ name = constructor_name (type); raises = synthesize_exception_spec (type, &locate_dtor, 0); break; case sfk_constructor: /* Default constructor. */ name = constructor_name (type); raises = synthesize_exception_spec (type, &locate_ctor, 0); break; case sfk_copy_constructor: case sfk_assignment_operator: case sfk_move_constructor: { struct copy_data data; data.name = NULL; data.quals = 0; if (kind == sfk_assignment_operator) { return_type = build_reference_type (type); name = ansi_assopname (NOP_EXPR); data.name = name; } else name = constructor_name (type); if (const_p) { data.quals = TYPE_QUAL_CONST; rhs_parm_type = build_qualified_type (type, TYPE_QUAL_CONST); } else rhs_parm_type = type; rhs_parm_type = cp_build_reference_type (rhs_parm_type, kind == sfk_move_constructor); parameter_types = tree_cons (NULL_TREE, rhs_parm_type, parameter_types); raises = synthesize_exception_spec (type, &locate_copy, &data); break; } default: gcc_unreachable (); } /* Create the function. */ fn_type = build_method_type_directly (type, return_type, parameter_types); if (raises) fn_type = build_exception_variant (fn_type, raises); fn = build_lang_decl (FUNCTION_DECL, name, fn_type); DECL_SOURCE_LOCATION (fn) = DECL_SOURCE_LOCATION (TYPE_NAME (type)); if (kind == sfk_constructor || kind == sfk_copy_constructor || kind == sfk_move_constructor) DECL_CONSTRUCTOR_P (fn) = 1; else if (kind == sfk_destructor) DECL_DESTRUCTOR_P (fn) = 1; else { DECL_ASSIGNMENT_OPERATOR_P (fn) = 1; SET_OVERLOADED_OPERATOR_CODE (fn, NOP_EXPR); } /* If pointers to member functions use the least significant bit to indicate whether a function is virtual, ensure a pointer to this function will have that bit clear. */ if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn && DECL_ALIGN (fn) < 2 * BITS_PER_UNIT) DECL_ALIGN (fn) = 2 * BITS_PER_UNIT; /* Create the explicit arguments. */ if (rhs_parm_type) { /* Note that this parameter is *not* marked DECL_ARTIFICIAL; we want its type to be included in the mangled function name. */ DECL_ARGUMENTS (fn) = cp_build_parm_decl (NULL_TREE, rhs_parm_type); TREE_READONLY (DECL_ARGUMENTS (fn)) = 1; } /* Add the "this" parameter. */ this_parm = build_this_parm (fn_type, TYPE_UNQUALIFIED); TREE_CHAIN (this_parm) = DECL_ARGUMENTS (fn); DECL_ARGUMENTS (fn) = this_parm; grokclassfn (type, fn, kind == sfk_destructor ? DTOR_FLAG : NO_SPECIAL); set_linkage_according_to_type (type, fn); rest_of_decl_compilation (fn, toplevel_bindings_p (), at_eof); DECL_IN_AGGR_P (fn) = 1; DECL_ARTIFICIAL (fn) = 1; DECL_DEFAULTED_FN (fn) = 1; DECL_NOT_REALLY_EXTERN (fn) = 1; DECL_DECLARED_INLINE_P (fn) = 1; gcc_assert (!TREE_USED (fn)); /* Restore PROCESSING_TEMPLATE_DECL. */ processing_template_decl = saved_processing_template_decl; return fn; } /* Gives any errors about defaulted functions which need to be deferred until the containing class is complete. */ void defaulted_late_check (tree fn) { /* Complain about invalid signature for defaulted fn. */ tree ctx = DECL_CONTEXT (fn); special_function_kind kind = special_function_p (fn); bool fn_const_p = (copy_fn_p (fn) == 2); tree implicit_fn = implicitly_declare_fn (kind, ctx, fn_const_p); if (!same_type_p (TREE_TYPE (TREE_TYPE (fn)), TREE_TYPE (TREE_TYPE (implicit_fn))) || !compparms (TYPE_ARG_TYPES (TREE_TYPE (fn)), TYPE_ARG_TYPES (TREE_TYPE (implicit_fn)))) { error ("defaulted declaration %q+D", fn); error_at (DECL_SOURCE_LOCATION (fn), "does not match expected signature %qD", implicit_fn); } } /* Returns true iff FN can be explicitly defaulted, and gives any errors if defaulting FN is ill-formed. */ bool defaultable_fn_check (tree fn) { special_function_kind kind = sfk_none; if (DECL_CONSTRUCTOR_P (fn)) { if (FUNCTION_FIRST_USER_PARMTYPE (fn) == void_list_node) kind = sfk_constructor; else if (copy_fn_p (fn) > 0 && (TREE_CHAIN (FUNCTION_FIRST_USER_PARMTYPE (fn)) == void_list_node)) kind = sfk_copy_constructor; else if (move_fn_p (fn)) kind = sfk_move_constructor; } else if (DECL_DESTRUCTOR_P (fn)) kind = sfk_destructor; else if (DECL_ASSIGNMENT_OPERATOR_P (fn) && DECL_OVERLOADED_OPERATOR_P (fn) == NOP_EXPR && copy_fn_p (fn)) kind = sfk_assignment_operator; if (kind == sfk_none) { error ("%qD cannot be defaulted", fn); return false; } else { tree t = FUNCTION_FIRST_USER_PARMTYPE (fn); for (; t && t != void_list_node; t = TREE_CHAIN (t)) if (TREE_PURPOSE (t)) { error ("defaulted function %q+D with default argument", fn); break; } if (TYPE_BEING_DEFINED (DECL_CONTEXT (fn))) { if (DECL_NONCONVERTING_P (fn)) error ("%qD declared explicit cannot be defaulted in the class " "body", fn); if (current_access_specifier != access_public_node) error ("%qD declared with non-public access cannot be defaulted " "in the class body", fn); if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))) error ("function %q+D defaulted on its first declaration " "must not have an exception-specification", fn); if (DECL_VIRTUAL_P (fn)) error ("%qD declared virtual cannot be defaulted in the class " "body", fn); } else if (!processing_template_decl) defaulted_late_check (fn); return true; } } /* Add an implicit declaration to TYPE for the kind of function indicated by SFK. Return the FUNCTION_DECL for the new implicit declaration. */ tree lazily_declare_fn (special_function_kind sfk, tree type) { tree fn; bool const_p; /* Figure out whether or not the argument has a const reference type. */ if (sfk == sfk_copy_constructor) const_p = TYPE_HAS_CONST_INIT_REF (type); else if (sfk == sfk_assignment_operator) const_p = TYPE_HAS_CONST_ASSIGN_REF (type); else /* In this case, CONST_P will be ignored. */ const_p = false; /* Declare the function. */ fn = implicitly_declare_fn (sfk, type, const_p); /* A destructor may be virtual. */ if (sfk == sfk_destructor) check_for_override (fn, type); /* Add it to CLASSTYPE_METHOD_VEC. */ add_method (type, fn, NULL_TREE); /* Add it to TYPE_METHODS. */ if (sfk == sfk_destructor && DECL_VIRTUAL_P (fn) && abi_version_at_least (2)) /* The ABI requires that a virtual destructor go at the end of the vtable. */ TYPE_METHODS (type) = chainon (TYPE_METHODS (type), fn); else { /* G++ 3.2 put the implicit destructor at the *beginning* of the TYPE_METHODS list, which cause the destructor to be emitted in an incorrect location in the vtable. */ if (warn_abi && sfk == sfk_destructor && DECL_VIRTUAL_P (fn)) warning (OPT_Wabi, "vtable layout for class %qT may not be ABI-compliant" "and may change in a future version of GCC due to " "implicit virtual destructor", type); TREE_CHAIN (fn) = TYPE_METHODS (type); TYPE_METHODS (type) = fn; } maybe_add_class_template_decl_list (type, fn, /*friend_p=*/0); if (sfk == sfk_assignment_operator) CLASSTYPE_LAZY_ASSIGNMENT_OP (type) = 0; else { /* Remember that the function has been created. */ if (sfk == sfk_constructor) CLASSTYPE_LAZY_DEFAULT_CTOR (type) = 0; else if (sfk == sfk_copy_constructor) CLASSTYPE_LAZY_COPY_CTOR (type) = 0; else if (sfk == sfk_move_constructor) CLASSTYPE_LAZY_MOVE_CTOR (type) = 0; else if (sfk == sfk_destructor) CLASSTYPE_LAZY_DESTRUCTOR (type) = 0; /* Create appropriate clones. */ clone_function_decl (fn, /*update_method_vec=*/true); } return fn; } /* Given a FUNCTION_DECL FN and a chain LIST, skip as many elements of LIST as there are artificial parms in FN. */ tree skip_artificial_parms_for (const_tree fn, tree list) { if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)) list = TREE_CHAIN (list); else return list; if (DECL_HAS_IN_CHARGE_PARM_P (fn)) list = TREE_CHAIN (list); if (DECL_HAS_VTT_PARM_P (fn)) list = TREE_CHAIN (list); return list; } /* Given a FUNCTION_DECL FN and a chain LIST, return the number of artificial parms in FN. */ int num_artificial_parms_for (const_tree fn) { int count = 0; if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)) count++; else return 0; if (DECL_HAS_IN_CHARGE_PARM_P (fn)) count++; if (DECL_HAS_VTT_PARM_P (fn)) count++; return count; } #include "gt-cp-method.h"
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