1 /* Some code common to C++ and ObjC++ front ends.
2 Copyright (C) 2004 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 2, 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 COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 #include "coretypes.h"
30 #include "langhooks.h"
31 #include "langhooks-def.h"
32 #include "diagnostic.h"
34 #include "cxx-pretty-print.h"
35 #include "cp-objcp-common.h"
37 /* Special routine to get the alias set for C++. */
40 cxx_get_alias_set (tree t)
42 if (IS_FAKE_BASE_TYPE (t))
43 /* The base variant of a type must be in the same alias set as the
45 return get_alias_set (TYPE_CONTEXT (t));
47 /* Punt on PMFs until we canonicalize functions properly. */
48 if (TYPE_PTRMEMFUNC_P (t))
51 return c_common_get_alias_set (t);
54 /* Called from check_global_declarations. */
57 cxx_warn_unused_global_decl (tree decl)
59 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
61 if (DECL_IN_SYSTEM_HEADER (decl))
64 /* Const variables take the place of #defines in C++. */
65 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))
71 /* Langhook for expr_size: Tell the backend that the value of an expression
72 of non-POD class type does not include any tail padding; a derived class
73 might have allocated something there. */
76 cp_expr_size (tree exp)
78 tree type = TREE_TYPE (exp);
80 if (CLASS_TYPE_P (type))
82 /* The backend should not be interested in the size of an expression
83 of a type with both of these set; all copies of such types must go
84 through a constructor or assignment op. */
85 gcc_assert (!TYPE_HAS_COMPLEX_INIT_REF (type)
86 || !TYPE_HAS_COMPLEX_ASSIGN_REF (type)
87 /* But storing a CONSTRUCTOR isn't a copy. */
88 || TREE_CODE (exp) == CONSTRUCTOR
89 /* And, the gimplifier will sometimes make a copy of
90 an aggregate. In particular, for a case like:
93 struct X { int a; S s; };
96 the gimplifier will create a temporary with
97 static storage duration, perform static
98 initialization of the temporary, and then copy
99 the result. Since the "s" subobject is never
100 constructed, this is a valid transformation. */
101 || CP_AGGREGATE_TYPE_P (type));
103 /* This would be wrong for a type with virtual bases, but they are
104 caught by the assert above. */
105 return (is_empty_class (type)
107 : CLASSTYPE_SIZE_UNIT (type));
110 /* Use the default code. */
111 return lhd_expr_size (exp);
114 /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */
116 cp_tree_size (enum tree_code code)
120 case TINST_LEVEL: return sizeof (struct tinst_level_s);
121 case PTRMEM_CST: return sizeof (struct ptrmem_cst);
122 case BASELINK: return sizeof (struct tree_baselink);
123 case TEMPLATE_PARM_INDEX: return sizeof (template_parm_index);
124 case DEFAULT_ARG: return sizeof (struct tree_default_arg);
125 case OVERLOAD: return sizeof (struct tree_overload);
132 /* Returns true if T is a variably modified type, in the sense of C99.
133 FN is as passed to variably_modified_p.
134 This routine needs only check cases that cannot be handled by the
135 language-independent logic in tree.c. */
138 cp_var_mod_type_p (tree type, tree fn)
140 /* If TYPE is a pointer-to-member, it is variably modified if either
141 the class or the member are variably modified. */
142 if (TYPE_PTR_TO_MEMBER_P (type))
143 return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type), fn)
144 || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type),
147 /* All other types are not variably modified. */
151 /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed
152 that CONTEXT->printer is an already constructed basic pretty_printer. */
154 cxx_initialize_diagnostics (diagnostic_context *context)
156 pretty_printer *base = context->printer;
157 cxx_pretty_printer *pp = XNEW (cxx_pretty_printer);
158 memcpy (pp_base (pp), base, sizeof (pretty_printer));
159 pp_cxx_pretty_printer_init (pp);
160 context->printer = (pretty_printer *) pp;
162 /* It is safe to free this object because it was previously malloc()'d. */
166 /* This compares two types for equivalence ("compatible" in C-based languages).
167 This routine should only return 1 if it is sure. It should not be used
168 in contexts where erroneously returning 0 causes problems. */
171 cxx_types_compatible_p (tree x, tree y)
173 if (same_type_ignoring_top_level_qualifiers_p (x, y))
176 /* Once we get to the middle-end, references and pointers are
177 interchangeable. FIXME should we try to replace all references with
179 if (POINTER_TYPE_P (x) && POINTER_TYPE_P (y)
180 && TYPE_MODE (x) == TYPE_MODE (y)
181 && TYPE_REF_CAN_ALIAS_ALL (x) == TYPE_REF_CAN_ALIAS_ALL (y)
182 && same_type_p (TREE_TYPE (x), TREE_TYPE (y)))
189 cxx_staticp (tree arg)
191 switch (TREE_CODE (arg))
194 return staticp (BASELINK_FUNCTIONS (arg));
203 /* Stubs to keep c-opts.c happy. */
205 push_file_scope (void)
210 pop_file_scope (void)
214 /* c-pragma.c needs to query whether a decl has extern "C" linkage. */
216 has_c_linkage (tree decl)
218 return DECL_EXTERN_C_P (decl);
221 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
222 htab_t shadowed_var_for_decl;
224 /* Lookup a shadowed var for FROM, and return it if we find one. */
227 decl_shadowed_for_var_lookup (tree from)
229 struct tree_map *h, in;
232 h = (struct tree_map *) htab_find_with_hash (shadowed_var_for_decl, &in,
233 htab_hash_pointer (from));
239 /* Insert a mapping FROM->TO in the shadowed var hashtable. */
242 decl_shadowed_for_var_insert (tree from, tree to)
247 h = GGC_NEW (struct tree_map);
248 h->hash = htab_hash_pointer (from);
251 loc = htab_find_slot_with_hash (shadowed_var_for_decl, h, h->hash, INSERT);
252 *(struct tree_map **) loc = h;
256 init_shadowed_var_for_decl (void)
258 shadowed_var_for_decl = htab_create_ggc (512, tree_map_hash,
263 #include "gt-cp-cp-objcp-common.h"