1 /* Some code common to C++ and ObjC++ front ends.
2 Copyright (C) 2004, 2007 Free Software Foundation, Inc.
3 Contributed by Ziemowit Laski <zlaski@apple.com>
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
29 #include "langhooks.h"
30 #include "langhooks-def.h"
31 #include "diagnostic.h"
33 #include "cxx-pretty-print.h"
34 #include "cp-objcp-common.h"
36 /* Special routine to get the alias set for C++. */
39 cxx_get_alias_set (tree t)
41 if (IS_FAKE_BASE_TYPE (t))
42 /* The base variant of a type must be in the same alias set as the
44 return get_alias_set (TYPE_CONTEXT (t));
46 /* Punt on PMFs until we canonicalize functions properly. */
47 if (TYPE_PTRMEMFUNC_P (t))
50 return c_common_get_alias_set (t);
53 /* Called from check_global_declarations. */
56 cxx_warn_unused_global_decl (const_tree decl)
58 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
60 if (DECL_IN_SYSTEM_HEADER (decl))
63 /* Const variables take the place of #defines in C++. */
64 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))
70 /* Langhook for expr_size: Tell the back end that the value of an expression
71 of non-POD class type does not include any tail padding; a derived class
72 might have allocated something there. */
75 cp_expr_size (const_tree exp)
77 tree type = TREE_TYPE (exp);
79 if (CLASS_TYPE_P (type))
81 /* The back end should not be interested in the size of an expression
82 of a type with both of these set; all copies of such types must go
83 through a constructor or assignment op. */
84 if (!TYPE_HAS_COMPLEX_INIT_REF (type)
85 || !TYPE_HAS_COMPLEX_ASSIGN_REF (type)
86 /* But storing a CONSTRUCTOR isn't a copy. */
87 || TREE_CODE (exp) == CONSTRUCTOR
88 /* And, the gimplifier will sometimes make a copy of
89 an aggregate. In particular, for a case like:
92 struct X { int a; S s; };
95 the gimplifier will create a temporary with
96 static storage duration, perform static
97 initialization of the temporary, and then copy
98 the result. Since the "s" subobject is never
99 constructed, this is a valid transformation. */
100 || CP_AGGREGATE_TYPE_P (type))
101 /* This would be wrong for a type with virtual bases. */
102 return (is_empty_class (type)
104 : CLASSTYPE_SIZE_UNIT (type));
109 /* Use the default code. */
110 return lhd_expr_size (exp);
113 /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */
115 cp_tree_size (enum tree_code code)
119 case TINST_LEVEL: return sizeof (struct tinst_level_s);
120 case PTRMEM_CST: return sizeof (struct ptrmem_cst);
121 case BASELINK: return sizeof (struct tree_baselink);
122 case TEMPLATE_PARM_INDEX: return sizeof (template_parm_index);
123 case DEFAULT_ARG: return sizeof (struct tree_default_arg);
124 case OVERLOAD: return sizeof (struct tree_overload);
125 case STATIC_ASSERT: return sizeof (struct tree_static_assert);
126 case TYPE_ARGUMENT_PACK:
127 case TYPE_PACK_EXPANSION:
128 return sizeof (struct tree_common);
130 case NONTYPE_ARGUMENT_PACK:
131 case EXPR_PACK_EXPANSION:
132 return sizeof (struct tree_exp);
134 case ARGUMENT_PACK_SELECT:
135 return sizeof (struct tree_argument_pack_select);
138 return sizeof (struct tree_trait_expr);
146 /* Returns true if T is a variably modified type, in the sense of C99.
147 FN is as passed to variably_modified_p.
148 This routine needs only check cases that cannot be handled by the
149 language-independent logic in tree.c. */
152 cp_var_mod_type_p (tree type, tree fn)
154 /* If TYPE is a pointer-to-member, it is variably modified if either
155 the class or the member are variably modified. */
156 if (TYPE_PTR_TO_MEMBER_P (type))
157 return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type), fn)
158 || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type),
161 /* All other types are not variably modified. */
165 /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed
166 that CONTEXT->printer is an already constructed basic pretty_printer. */
168 cxx_initialize_diagnostics (diagnostic_context *context)
170 pretty_printer *base = context->printer;
171 cxx_pretty_printer *pp = XNEW (cxx_pretty_printer);
172 memcpy (pp_base (pp), base, sizeof (pretty_printer));
173 pp_cxx_pretty_printer_init (pp);
174 context->printer = (pretty_printer *) pp;
176 /* It is safe to free this object because it was previously malloc()'d. */
180 /* This compares two types for equivalence ("compatible" in C-based languages).
181 This routine should only return 1 if it is sure. It should not be used
182 in contexts where erroneously returning 0 causes problems. */
185 cxx_types_compatible_p (tree x, tree y)
187 if (same_type_ignoring_top_level_qualifiers_p (x, y))
190 /* Once we get to the middle-end, references and pointers are
191 interchangeable. FIXME should we try to replace all references with
193 if (POINTER_TYPE_P (x) && POINTER_TYPE_P (y)
194 && TYPE_MODE (x) == TYPE_MODE (y)
195 && TYPE_REF_CAN_ALIAS_ALL (x) == TYPE_REF_CAN_ALIAS_ALL (y)
196 && same_type_p (TREE_TYPE (x), TREE_TYPE (y)))
203 cxx_staticp (tree arg)
205 switch (TREE_CODE (arg))
208 return staticp (BASELINK_FUNCTIONS (arg));
217 /* Stubs to keep c-opts.c happy. */
219 push_file_scope (void)
224 pop_file_scope (void)
228 /* c-pragma.c needs to query whether a decl has extern "C" linkage. */
230 has_c_linkage (tree decl)
232 return DECL_EXTERN_C_P (decl);
235 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
236 htab_t shadowed_var_for_decl;
238 /* Lookup a shadowed var for FROM, and return it if we find one. */
241 decl_shadowed_for_var_lookup (tree from)
243 struct tree_map *h, in;
246 h = (struct tree_map *) htab_find_with_hash (shadowed_var_for_decl, &in,
247 htab_hash_pointer (from));
253 /* Insert a mapping FROM->TO in the shadowed var hashtable. */
256 decl_shadowed_for_var_insert (tree from, tree to)
261 h = GGC_NEW (struct tree_map);
262 h->hash = htab_hash_pointer (from);
265 loc = htab_find_slot_with_hash (shadowed_var_for_decl, h, h->hash, INSERT);
266 *(struct tree_map **) loc = h;
270 init_shadowed_var_for_decl (void)
272 shadowed_var_for_decl = htab_create_ggc (512, tree_map_hash,
277 #include "gt-cp-cp-objcp-common.h"