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5dd72fac | 1 | /* Some code common to C++ and ObjC++ front ends. |
3aea1f79 | 2 | Copyright (C) 2004-2014 Free Software Foundation, Inc. |
5dd72fac | 3 | Contributed by Ziemowit Laski <zlaski@apple.com> |
4 | ||
5 | This file is part of GCC. | |
6 | ||
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 | |
aa139c3f | 9 | Software Foundation; either version 3, or (at your option) any later |
5dd72fac | 10 | version. |
11 | ||
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 | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
aa139c3f | 18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
5dd72fac | 20 | |
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "tm.h" | |
25 | #include "tree.h" | |
26 | #include "cp-tree.h" | |
7bedc3a0 | 27 | #include "c-family/c-common.h" |
5dd72fac | 28 | #include "langhooks.h" |
29 | #include "langhooks-def.h" | |
30 | #include "diagnostic.h" | |
31 | #include "debug.h" | |
32 | #include "cxx-pretty-print.h" | |
33 | #include "cp-objcp-common.h" | |
34 | ||
eed6bc21 | 35 | #include <new> // For placement new. |
36 | ||
5dd72fac | 37 | /* Special routine to get the alias set for C++. */ |
38 | ||
32c2fdea | 39 | alias_set_type |
5dd72fac | 40 | cxx_get_alias_set (tree t) |
41 | { | |
42 | if (IS_FAKE_BASE_TYPE (t)) | |
43 | /* The base variant of a type must be in the same alias set as the | |
44 | complete type. */ | |
45 | return get_alias_set (TYPE_CONTEXT (t)); | |
46 | ||
47 | /* Punt on PMFs until we canonicalize functions properly. */ | |
f607c97b | 48 | if (TYPE_PTRMEMFUNC_P (t) |
49 | || (POINTER_TYPE_P (t) | |
50 | && TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))) | |
5dd72fac | 51 | return 0; |
52 | ||
53 | return c_common_get_alias_set (t); | |
54 | } | |
55 | ||
56 | /* Called from check_global_declarations. */ | |
57 | ||
58 | bool | |
f8fd23c0 | 59 | cxx_warn_unused_global_decl (const_tree decl) |
5dd72fac | 60 | { |
61 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)) | |
62 | return false; | |
63 | if (DECL_IN_SYSTEM_HEADER (decl)) | |
64 | return false; | |
65 | ||
66 | /* Const variables take the place of #defines in C++. */ | |
80a58eb0 | 67 | if (VAR_P (decl) && TREE_READONLY (decl)) |
5dd72fac | 68 | return false; |
69 | ||
70 | return true; | |
71 | } | |
72 | ||
5dd72fac | 73 | /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */ |
74 | size_t | |
75 | cp_tree_size (enum tree_code code) | |
76 | { | |
77 | switch (code) | |
78 | { | |
653e5405 | 79 | case PTRMEM_CST: return sizeof (struct ptrmem_cst); |
5dd72fac | 80 | case BASELINK: return sizeof (struct tree_baselink); |
653e5405 | 81 | case TEMPLATE_PARM_INDEX: return sizeof (template_parm_index); |
5dd72fac | 82 | case DEFAULT_ARG: return sizeof (struct tree_default_arg); |
6bb4902d | 83 | case DEFERRED_NOEXCEPT: return sizeof (struct tree_deferred_noexcept); |
5dd72fac | 84 | case OVERLOAD: return sizeof (struct tree_overload); |
7a05c4b1 | 85 | case STATIC_ASSERT: return sizeof (struct tree_static_assert); |
d95d815d | 86 | case TYPE_ARGUMENT_PACK: |
87 | case TYPE_PACK_EXPANSION: | |
88 | return sizeof (struct tree_common); | |
89 | ||
90 | case NONTYPE_ARGUMENT_PACK: | |
91 | case EXPR_PACK_EXPANSION: | |
92 | return sizeof (struct tree_exp); | |
93 | ||
94 | case ARGUMENT_PACK_SELECT: | |
95 | return sizeof (struct tree_argument_pack_select); | |
96 | ||
481451eb | 97 | case TRAIT_EXPR: |
98 | return sizeof (struct tree_trait_expr); | |
99 | ||
a8b75081 | 100 | case LAMBDA_EXPR: return sizeof (struct tree_lambda_expr); |
101 | ||
b08c3803 | 102 | case TEMPLATE_INFO: return sizeof (struct tree_template_info); |
103 | ||
244db24d | 104 | case USERDEF_LITERAL: return sizeof (struct tree_userdef_literal); |
105 | ||
5dd72fac | 106 | default: |
107 | gcc_unreachable (); | |
108 | } | |
109 | /* NOTREACHED */ | |
110 | } | |
111 | ||
112 | /* Returns true if T is a variably modified type, in the sense of C99. | |
113 | FN is as passed to variably_modified_p. | |
114 | This routine needs only check cases that cannot be handled by the | |
115 | language-independent logic in tree.c. */ | |
116 | ||
117 | bool | |
118 | cp_var_mod_type_p (tree type, tree fn) | |
119 | { | |
120 | /* If TYPE is a pointer-to-member, it is variably modified if either | |
121 | the class or the member are variably modified. */ | |
05765a91 | 122 | if (TYPE_PTRMEM_P (type)) |
5dd72fac | 123 | return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type), fn) |
124 | || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type), | |
125 | fn)); | |
126 | ||
127 | /* All other types are not variably modified. */ | |
128 | return false; | |
129 | } | |
130 | ||
131 | /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed | |
132 | that CONTEXT->printer is an already constructed basic pretty_printer. */ | |
133 | void | |
134 | cxx_initialize_diagnostics (diagnostic_context *context) | |
135 | { | |
e88d34f6 | 136 | c_common_initialize_diagnostics (context); |
137 | ||
eed6bc21 | 138 | pretty_printer *base = context->printer; |
139 | cxx_pretty_printer *pp = XNEW (cxx_pretty_printer); | |
140 | context->printer = new (pp) cxx_pretty_printer (); | |
5dd72fac | 141 | |
eed6bc21 | 142 | /* It is safe to free this object because it was previously XNEW()'d. */ |
6f07f480 | 143 | base->~pretty_printer (); |
eed6bc21 | 144 | XDELETE (base); |
5dd72fac | 145 | } |
146 | ||
3dac5c5e | 147 | /* This compares two types for equivalence ("compatible" in C-based languages). |
148 | This routine should only return 1 if it is sure. It should not be used | |
149 | in contexts where erroneously returning 0 causes problems. */ | |
150 | ||
151 | int | |
152 | cxx_types_compatible_p (tree x, tree y) | |
153 | { | |
29f51994 | 154 | return same_type_ignoring_top_level_qualifiers_p (x, y); |
3dac5c5e | 155 | } |
156 | ||
cb3582e7 | 157 | /* Return true if DECL is explicit member function. */ |
158 | ||
159 | bool | |
160 | cp_function_decl_explicit_p (tree decl) | |
161 | { | |
162 | return (decl | |
4143d08b | 163 | && DECL_LANG_SPECIFIC (STRIP_TEMPLATE (decl)) |
cb3582e7 | 164 | && DECL_NONCONVERTING_P (decl)); |
165 | } | |
166 | ||
5dd72fac | 167 | /* Stubs to keep c-opts.c happy. */ |
168 | void | |
169 | push_file_scope (void) | |
170 | { | |
171 | } | |
172 | ||
173 | void | |
174 | pop_file_scope (void) | |
175 | { | |
176 | } | |
177 | ||
178 | /* c-pragma.c needs to query whether a decl has extern "C" linkage. */ | |
179 | bool | |
9f627b1a | 180 | has_c_linkage (const_tree decl) |
5dd72fac | 181 | { |
182 | return DECL_EXTERN_C_P (decl); | |
183 | } | |
4dd41a12 | 184 | |
cc194b6e | 185 | static GTY ((if_marked ("tree_decl_map_marked_p"), param_is (struct tree_decl_map))) |
4dd41a12 | 186 | htab_t shadowed_var_for_decl; |
187 | ||
188 | /* Lookup a shadowed var for FROM, and return it if we find one. */ | |
189 | ||
074ab442 | 190 | tree |
4dd41a12 | 191 | decl_shadowed_for_var_lookup (tree from) |
192 | { | |
cc194b6e | 193 | struct tree_decl_map *h, in; |
9af7fd5b | 194 | in.base.from = from; |
4dd41a12 | 195 | |
cc194b6e | 196 | h = (struct tree_decl_map *) |
197 | htab_find_with_hash (shadowed_var_for_decl, &in, DECL_UID (from)); | |
4dd41a12 | 198 | if (h) |
199 | return h->to; | |
200 | return NULL_TREE; | |
201 | } | |
202 | ||
203 | /* Insert a mapping FROM->TO in the shadowed var hashtable. */ | |
204 | ||
205 | void | |
206 | decl_shadowed_for_var_insert (tree from, tree to) | |
207 | { | |
cc194b6e | 208 | struct tree_decl_map *h; |
4dd41a12 | 209 | void **loc; |
210 | ||
25a27413 | 211 | h = ggc_alloc<tree_decl_map> (); |
9af7fd5b | 212 | h->base.from = from; |
4dd41a12 | 213 | h->to = to; |
cc194b6e | 214 | loc = htab_find_slot_with_hash (shadowed_var_for_decl, h, DECL_UID (from), |
215 | INSERT); | |
216 | *(struct tree_decl_map **) loc = h; | |
4dd41a12 | 217 | } |
218 | ||
219 | void | |
220 | init_shadowed_var_for_decl (void) | |
221 | { | |
cc194b6e | 222 | shadowed_var_for_decl = htab_create_ggc (512, tree_decl_map_hash, |
223 | tree_decl_map_eq, 0); | |
4dd41a12 | 224 | } |
225 | ||
88aa6d3e | 226 | /* Return true if stmt can fall through. Used by block_may_fallthru |
6cb25bec | 227 | default case. */ |
228 | ||
229 | bool | |
230 | cxx_block_may_fallthru (const_tree stmt) | |
231 | { | |
232 | switch (TREE_CODE (stmt)) | |
233 | { | |
234 | case EXPR_STMT: | |
235 | return block_may_fallthru (EXPR_STMT_EXPR (stmt)); | |
236 | ||
237 | case THROW_EXPR: | |
238 | return false; | |
239 | ||
240 | default: | |
241 | return true; | |
242 | } | |
243 | } | |
244 | ||
9b88d08d | 245 | void |
246 | cp_common_init_ts (void) | |
247 | { | |
248 | MARK_TS_DECL_NON_COMMON (NAMESPACE_DECL); | |
249 | MARK_TS_DECL_NON_COMMON (USING_DECL); | |
250 | MARK_TS_DECL_NON_COMMON (TEMPLATE_DECL); | |
251 | ||
252 | MARK_TS_COMMON (TEMPLATE_TEMPLATE_PARM); | |
253 | MARK_TS_COMMON (TEMPLATE_TYPE_PARM); | |
254 | MARK_TS_COMMON (TEMPLATE_PARM_INDEX); | |
255 | MARK_TS_COMMON (OVERLOAD); | |
256 | MARK_TS_COMMON (TEMPLATE_INFO); | |
9b88d08d | 257 | MARK_TS_COMMON (TYPENAME_TYPE); |
258 | MARK_TS_COMMON (TYPEOF_TYPE); | |
8de5c43e | 259 | MARK_TS_COMMON (UNDERLYING_TYPE); |
9b88d08d | 260 | MARK_TS_COMMON (BASELINK); |
9b88d08d | 261 | MARK_TS_COMMON (TYPE_PACK_EXPANSION); |
b0801676 | 262 | MARK_TS_COMMON (TYPE_ARGUMENT_PACK); |
9b88d08d | 263 | MARK_TS_COMMON (DECLTYPE_TYPE); |
264 | MARK_TS_COMMON (BOUND_TEMPLATE_TEMPLATE_PARM); | |
265 | MARK_TS_COMMON (UNBOUND_CLASS_TEMPLATE); | |
9b88d08d | 266 | |
d558fa9c | 267 | MARK_TS_TYPED (EXPR_PACK_EXPANSION); |
1f919c50 | 268 | MARK_TS_TYPED (SWITCH_STMT); |
852787ab | 269 | MARK_TS_TYPED (IF_STMT); |
e45c9c55 | 270 | MARK_TS_TYPED (FOR_STMT); |
271 | MARK_TS_TYPED (RANGE_FOR_STMT); | |
9b88d08d | 272 | MARK_TS_TYPED (AGGR_INIT_EXPR); |
273 | MARK_TS_TYPED (EXPR_STMT); | |
274 | MARK_TS_TYPED (EH_SPEC_BLOCK); | |
275 | MARK_TS_TYPED (CLEANUP_STMT); | |
276 | MARK_TS_TYPED (SCOPE_REF); | |
277 | MARK_TS_TYPED (CAST_EXPR); | |
278 | MARK_TS_TYPED (NON_DEPENDENT_EXPR); | |
279 | MARK_TS_TYPED (MODOP_EXPR); | |
280 | MARK_TS_TYPED (TRY_BLOCK); | |
281 | MARK_TS_TYPED (THROW_EXPR); | |
282 | MARK_TS_TYPED (HANDLER); | |
283 | MARK_TS_TYPED (REINTERPRET_CAST_EXPR); | |
284 | MARK_TS_TYPED (CONST_CAST_EXPR); | |
285 | MARK_TS_TYPED (STATIC_CAST_EXPR); | |
286 | MARK_TS_TYPED (DYNAMIC_CAST_EXPR); | |
91c3ace5 | 287 | MARK_TS_TYPED (IMPLICIT_CONV_EXPR); |
9b88d08d | 288 | MARK_TS_TYPED (TEMPLATE_ID_EXPR); |
289 | MARK_TS_TYPED (ARROW_EXPR); | |
290 | MARK_TS_TYPED (SIZEOF_EXPR); | |
291 | MARK_TS_TYPED (ALIGNOF_EXPR); | |
292 | MARK_TS_TYPED (AT_ENCODE_EXPR); | |
293 | MARK_TS_TYPED (UNARY_PLUS_EXPR); | |
294 | MARK_TS_TYPED (TRAIT_EXPR); | |
295 | MARK_TS_TYPED (TYPE_ARGUMENT_PACK); | |
296 | MARK_TS_TYPED (NOEXCEPT_EXPR); | |
297 | MARK_TS_TYPED (NONTYPE_ARGUMENT_PACK); | |
298 | MARK_TS_TYPED (WHILE_STMT); | |
299 | MARK_TS_TYPED (NEW_EXPR); | |
300 | MARK_TS_TYPED (VEC_NEW_EXPR); | |
301 | MARK_TS_TYPED (BREAK_STMT); | |
302 | MARK_TS_TYPED (MEMBER_REF); | |
303 | MARK_TS_TYPED (DOTSTAR_EXPR); | |
304 | MARK_TS_TYPED (DO_STMT); | |
305 | MARK_TS_TYPED (DELETE_EXPR); | |
306 | MARK_TS_TYPED (VEC_DELETE_EXPR); | |
307 | MARK_TS_TYPED (CONTINUE_STMT); | |
308 | MARK_TS_TYPED (TAG_DEFN); | |
309 | MARK_TS_TYPED (PSEUDO_DTOR_EXPR); | |
310 | MARK_TS_TYPED (TYPEID_EXPR); | |
311 | MARK_TS_TYPED (MUST_NOT_THROW_EXPR); | |
312 | MARK_TS_TYPED (STMT_EXPR); | |
313 | MARK_TS_TYPED (OFFSET_REF); | |
314 | MARK_TS_TYPED (OFFSETOF_EXPR); | |
315 | MARK_TS_TYPED (PTRMEM_CST); | |
316 | MARK_TS_TYPED (EMPTY_CLASS_EXPR); | |
317 | MARK_TS_TYPED (VEC_INIT_EXPR); | |
318 | MARK_TS_TYPED (USING_STMT); | |
319 | MARK_TS_TYPED (LAMBDA_EXPR); | |
e2d6b6ce | 320 | MARK_TS_TYPED (CTOR_INITIALIZER); |
e9331eab | 321 | MARK_TS_TYPED (ARRAY_NOTATION_REF); |
9b88d08d | 322 | } |
4dd41a12 | 323 | |
324 | #include "gt-cp-cp-objcp-common.h" |