1 /* Some code common to C++ and ObjC++ front ends.
2 Copyright (C) 2004, 2007, 2008, 2009 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
)
48 || (POINTER_TYPE_P (t
)
49 && TYPE_PTRMEMFUNC_P (TREE_TYPE (t
))))
52 return c_common_get_alias_set (t
);
55 /* Called from check_global_declarations. */
58 cxx_warn_unused_global_decl (const_tree decl
)
60 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
))
62 if (DECL_IN_SYSTEM_HEADER (decl
))
65 /* Const variables take the place of #defines in C++. */
66 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_READONLY (decl
))
72 /* Langhook for expr_size: Tell the back end that the value of an expression
73 of non-POD class type does not include any tail padding; a derived class
74 might have allocated something there. */
77 cp_expr_size (const_tree exp
)
79 tree type
= TREE_TYPE (exp
);
81 if (CLASS_TYPE_P (type
))
83 /* The back end should not be interested in the size of an expression
84 of a type with both of these set; all copies of such types must go
85 through a constructor or assignment op. */
86 if (!TYPE_HAS_COMPLEX_INIT_REF (type
)
87 || !TYPE_HAS_COMPLEX_ASSIGN_REF (type
)
88 /* But storing a CONSTRUCTOR isn't a copy. */
89 || TREE_CODE (exp
) == CONSTRUCTOR
90 /* And, the gimplifier will sometimes make a copy of
91 an aggregate. In particular, for a case like:
94 struct X { int a; S s; };
97 the gimplifier will create a temporary with
98 static storage duration, perform static
99 initialization of the temporary, and then copy
100 the result. Since the "s" subobject is never
101 constructed, this is a valid transformation. */
102 || CP_AGGREGATE_TYPE_P (type
))
103 /* This would be wrong for a type with virtual bases. */
104 return (is_really_empty_class (type
)
106 : CLASSTYPE_SIZE_UNIT (type
));
111 /* Use the default code. */
112 return tree_expr_size (exp
);
115 /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */
117 cp_tree_size (enum tree_code code
)
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
);
126 case STATIC_ASSERT
: return sizeof (struct tree_static_assert
);
127 case TYPE_ARGUMENT_PACK
:
128 case TYPE_PACK_EXPANSION
:
129 return sizeof (struct tree_common
);
131 case NONTYPE_ARGUMENT_PACK
:
132 case EXPR_PACK_EXPANSION
:
133 return sizeof (struct tree_exp
);
135 case ARGUMENT_PACK_SELECT
:
136 return sizeof (struct tree_argument_pack_select
);
139 return sizeof (struct tree_trait_expr
);
147 /* Returns true if T is a variably modified type, in the sense of C99.
148 FN is as passed to variably_modified_p.
149 This routine needs only check cases that cannot be handled by the
150 language-independent logic in tree.c. */
153 cp_var_mod_type_p (tree type
, tree fn
)
155 /* If TYPE is a pointer-to-member, it is variably modified if either
156 the class or the member are variably modified. */
157 if (TYPE_PTR_TO_MEMBER_P (type
))
158 return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type
), fn
)
159 || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type
),
162 /* All other types are not variably modified. */
166 /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed
167 that CONTEXT->printer is an already constructed basic pretty_printer. */
169 cxx_initialize_diagnostics (diagnostic_context
*context
)
171 pretty_printer
*base
= context
->printer
;
172 cxx_pretty_printer
*pp
= XNEW (cxx_pretty_printer
);
173 memcpy (pp_base (pp
), base
, sizeof (pretty_printer
));
174 pp_cxx_pretty_printer_init (pp
);
175 context
->printer
= (pretty_printer
*) pp
;
177 /* It is safe to free this object because it was previously malloc()'d. */
181 /* This compares two types for equivalence ("compatible" in C-based languages).
182 This routine should only return 1 if it is sure. It should not be used
183 in contexts where erroneously returning 0 causes problems. */
186 cxx_types_compatible_p (tree x
, tree y
)
188 return same_type_ignoring_top_level_qualifiers_p (x
, y
);
191 /* Return true if DECL is explicit member function. */
194 cp_function_decl_explicit_p (tree decl
)
197 && FUNCTION_FIRST_USER_PARMTYPE (decl
) != void_list_node
198 && DECL_NONCONVERTING_P (decl
));
201 /* Stubs to keep c-opts.c happy. */
203 push_file_scope (void)
208 pop_file_scope (void)
212 /* c-pragma.c needs to query whether a decl has extern "C" linkage. */
214 has_c_linkage (const_tree decl
)
216 return DECL_EXTERN_C_P (decl
);
219 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
220 htab_t shadowed_var_for_decl
;
222 /* Lookup a shadowed var for FROM, and return it if we find one. */
225 decl_shadowed_for_var_lookup (tree from
)
227 struct tree_map
*h
, in
;
230 h
= (struct tree_map
*) htab_find_with_hash (shadowed_var_for_decl
, &in
,
231 htab_hash_pointer (from
));
237 /* Insert a mapping FROM->TO in the shadowed var hashtable. */
240 decl_shadowed_for_var_insert (tree from
, tree to
)
245 h
= GGC_NEW (struct tree_map
);
246 h
->hash
= htab_hash_pointer (from
);
249 loc
= htab_find_slot_with_hash (shadowed_var_for_decl
, h
, h
->hash
, INSERT
);
250 *(struct tree_map
**) loc
= h
;
254 init_shadowed_var_for_decl (void)
256 shadowed_var_for_decl
= htab_create_ggc (512, tree_map_hash
,
261 #include "gt-cp-cp-objcp-common.h"