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 if (!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
))
102 /* This would be wrong for a type with virtual bases. */
103 return (is_empty_class (type
)
105 : 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
);
126 case STATIC_ASSERT
: return sizeof (struct tree_static_assert
);
133 /* Returns true if T is a variably modified type, in the sense of C99.
134 FN is as passed to variably_modified_p.
135 This routine needs only check cases that cannot be handled by the
136 language-independent logic in tree.c. */
139 cp_var_mod_type_p (tree type
, tree fn
)
141 /* If TYPE is a pointer-to-member, it is variably modified if either
142 the class or the member are variably modified. */
143 if (TYPE_PTR_TO_MEMBER_P (type
))
144 return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type
), fn
)
145 || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type
),
148 /* All other types are not variably modified. */
152 /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed
153 that CONTEXT->printer is an already constructed basic pretty_printer. */
155 cxx_initialize_diagnostics (diagnostic_context
*context
)
157 pretty_printer
*base
= context
->printer
;
158 cxx_pretty_printer
*pp
= XNEW (cxx_pretty_printer
);
159 memcpy (pp_base (pp
), base
, sizeof (pretty_printer
));
160 pp_cxx_pretty_printer_init (pp
);
161 context
->printer
= (pretty_printer
*) pp
;
163 /* It is safe to free this object because it was previously malloc()'d. */
167 /* This compares two types for equivalence ("compatible" in C-based languages).
168 This routine should only return 1 if it is sure. It should not be used
169 in contexts where erroneously returning 0 causes problems. */
172 cxx_types_compatible_p (tree x
, tree y
)
174 if (same_type_ignoring_top_level_qualifiers_p (x
, y
))
177 /* Once we get to the middle-end, references and pointers are
178 interchangeable. FIXME should we try to replace all references with
180 if (POINTER_TYPE_P (x
) && POINTER_TYPE_P (y
)
181 && TYPE_MODE (x
) == TYPE_MODE (y
)
182 && TYPE_REF_CAN_ALIAS_ALL (x
) == TYPE_REF_CAN_ALIAS_ALL (y
)
183 && same_type_p (TREE_TYPE (x
), TREE_TYPE (y
)))
190 cxx_staticp (tree arg
)
192 switch (TREE_CODE (arg
))
195 return staticp (BASELINK_FUNCTIONS (arg
));
204 /* Stubs to keep c-opts.c happy. */
206 push_file_scope (void)
211 pop_file_scope (void)
215 /* c-pragma.c needs to query whether a decl has extern "C" linkage. */
217 has_c_linkage (tree decl
)
219 return DECL_EXTERN_C_P (decl
);
222 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
223 htab_t shadowed_var_for_decl
;
225 /* Lookup a shadowed var for FROM, and return it if we find one. */
228 decl_shadowed_for_var_lookup (tree from
)
230 struct tree_map
*h
, in
;
233 h
= (struct tree_map
*) htab_find_with_hash (shadowed_var_for_decl
, &in
,
234 htab_hash_pointer (from
));
240 /* Insert a mapping FROM->TO in the shadowed var hashtable. */
243 decl_shadowed_for_var_insert (tree from
, tree to
)
248 h
= GGC_NEW (struct tree_map
);
249 h
->hash
= htab_hash_pointer (from
);
252 loc
= htab_find_slot_with_hash (shadowed_var_for_decl
, h
, h
->hash
, INSERT
);
253 *(struct tree_map
**) loc
= h
;
257 init_shadowed_var_for_decl (void)
259 shadowed_var_for_decl
= htab_create_ggc (512, tree_map_hash
,
264 #include "gt-cp-cp-objcp-common.h"