1 /* Some code common to C++ and ObjC++ front ends. 2 Copyright (C) 2004-2013 Free Software Foundation, Inc. 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 9 Software Foundation; either version 3, or (at your option) any later 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 18 along with GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 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" 27 #include "c-family/c-common.h" 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 35 /* Special routine to get the alias set for C++. */ 36 37 alias_set_type 38 cxx_get_alias_set (tree t) 39 { 40 if (IS_FAKE_BASE_TYPE (t)) 41 /* The base variant of a type must be in the same alias set as the 42 complete type. */ 43 return get_alias_set (TYPE_CONTEXT (t)); 44 45 /* Punt on PMFs until we canonicalize functions properly. */ 46 if (TYPE_PTRMEMFUNC_P (t) 47 || (POINTER_TYPE_P (t) 48 && TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))) 49 return 0; 50 51 return c_common_get_alias_set (t); 52 } 53 54 /* Called from check_global_declarations. */ 55 56 bool 57 cxx_warn_unused_global_decl (const_tree decl) 58 { 59 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)) 60 return false; 61 if (DECL_IN_SYSTEM_HEADER (decl)) 62 return false; 63 64 /* Const variables take the place of #defines in C++. */ 65 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl)) 66 return false; 67 68 return true; 69 } 70 71 /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */ 72 size_t 73 cp_tree_size (enum tree_code code) 74 { 75 switch (code) 76 { 77 case PTRMEM_CST: return sizeof (struct ptrmem_cst); 78 case BASELINK: return sizeof (struct tree_baselink); 79 case TEMPLATE_PARM_INDEX: return sizeof (template_parm_index); 80 case DEFAULT_ARG: return sizeof (struct tree_default_arg); 81 case DEFERRED_NOEXCEPT: return sizeof (struct tree_deferred_noexcept); 82 case OVERLOAD: return sizeof (struct tree_overload); 83 case STATIC_ASSERT: return sizeof (struct tree_static_assert); 84 case TYPE_ARGUMENT_PACK: 85 case TYPE_PACK_EXPANSION: 86 return sizeof (struct tree_common); 87 88 case NONTYPE_ARGUMENT_PACK: 89 case EXPR_PACK_EXPANSION: 90 return sizeof (struct tree_exp); 91 92 case ARGUMENT_PACK_SELECT: 93 return sizeof (struct tree_argument_pack_select); 94 95 case TRAIT_EXPR: 96 return sizeof (struct tree_trait_expr); 97 98 case LAMBDA_EXPR: return sizeof (struct tree_lambda_expr); 99 100 case TEMPLATE_INFO: return sizeof (struct tree_template_info); 101 102 case USERDEF_LITERAL: return sizeof (struct tree_userdef_literal); 103 104 default: 105 gcc_unreachable (); 106 } 107 /* NOTREACHED */ 108 } 109 110 /* Returns true if T is a variably modified type, in the sense of C99. 111 FN is as passed to variably_modified_p. 112 This routine needs only check cases that cannot be handled by the 113 language-independent logic in tree.c. */ 114 115 bool 116 cp_var_mod_type_p (tree type, tree fn) 117 { 118 /* If TYPE is a pointer-to-member, it is variably modified if either 119 the class or the member are variably modified. */ 120 if (TYPE_PTRMEM_P (type)) 121 return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type), fn) 122 || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type), 123 fn)); 124 125 /* All other types are not variably modified. */ 126 return false; 127 } 128 129 /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed 130 that CONTEXT->printer is an already constructed basic pretty_printer. */ 131 void 132 cxx_initialize_diagnostics (diagnostic_context *context) 133 { 134 pretty_printer *base; 135 cxx_pretty_printer *pp; 136 137 c_common_initialize_diagnostics (context); 138 139 base = context->printer; 140 pp = XNEW (cxx_pretty_printer); 141 memcpy (pp_base (pp), base, sizeof (pretty_printer)); 142 pp_cxx_pretty_printer_init (pp); 143 context->printer = (pretty_printer *) pp; 144 145 /* It is safe to free this object because it was previously malloc()'d. */ 146 free (base); 147 } 148 149 /* This compares two types for equivalence ("compatible" in C-based languages). 150 This routine should only return 1 if it is sure. It should not be used 151 in contexts where erroneously returning 0 causes problems. */ 152 153 int 154 cxx_types_compatible_p (tree x, tree y) 155 { 156 return same_type_ignoring_top_level_qualifiers_p (x, y); 157 } 158 159 /* Return true if DECL is explicit member function. */ 160 161 bool 162 cp_function_decl_explicit_p (tree decl) 163 { 164 return (decl 165 && FUNCTION_FIRST_USER_PARMTYPE (decl) != void_list_node 166 && DECL_LANG_SPECIFIC (STRIP_TEMPLATE (decl)) 167 && DECL_NONCONVERTING_P (decl)); 168 } 169 170 /* Stubs to keep c-opts.c happy. */ 171 void 172 push_file_scope (void) 173 { 174 } 175 176 void 177 pop_file_scope (void) 178 { 179 } 180 181 /* c-pragma.c needs to query whether a decl has extern "C" linkage. */ 182 bool 183 has_c_linkage (const_tree decl) 184 { 185 return DECL_EXTERN_C_P (decl); 186 } 187 188 static GTY ((if_marked ("tree_decl_map_marked_p"), param_is (struct tree_decl_map))) 189 htab_t shadowed_var_for_decl; 190 191 /* Lookup a shadowed var for FROM, and return it if we find one. */ 192 193 tree 194 decl_shadowed_for_var_lookup (tree from) 195 { 196 struct tree_decl_map *h, in; 197 in.base.from = from; 198 199 h = (struct tree_decl_map *) 200 htab_find_with_hash (shadowed_var_for_decl, &in, DECL_UID (from)); 201 if (h) 202 return h->to; 203 return NULL_TREE; 204 } 205 206 /* Insert a mapping FROM->TO in the shadowed var hashtable. */ 207 208 void 209 decl_shadowed_for_var_insert (tree from, tree to) 210 { 211 struct tree_decl_map *h; 212 void **loc; 213 214 h = ggc_alloc_tree_decl_map (); 215 h->base.from = from; 216 h->to = to; 217 loc = htab_find_slot_with_hash (shadowed_var_for_decl, h, DECL_UID (from), 218 INSERT); 219 *(struct tree_decl_map **) loc = h; 220 } 221 222 void 223 init_shadowed_var_for_decl (void) 224 { 225 shadowed_var_for_decl = htab_create_ggc (512, tree_decl_map_hash, 226 tree_decl_map_eq, 0); 227 } 228 229 /* Return true if stmt can fall thru. Used by block_may_fallthru 230 default case. */ 231 232 bool 233 cxx_block_may_fallthru (const_tree stmt) 234 { 235 switch (TREE_CODE (stmt)) 236 { 237 case EXPR_STMT: 238 return block_may_fallthru (EXPR_STMT_EXPR (stmt)); 239 240 case THROW_EXPR: 241 return false; 242 243 default: 244 return true; 245 } 246 } 247 248 void 249 cp_common_init_ts (void) 250 { 251 MARK_TS_DECL_NON_COMMON (NAMESPACE_DECL); 252 MARK_TS_DECL_NON_COMMON (USING_DECL); 253 MARK_TS_DECL_NON_COMMON (TEMPLATE_DECL); 254 255 MARK_TS_COMMON (TEMPLATE_TEMPLATE_PARM); 256 MARK_TS_COMMON (TEMPLATE_TYPE_PARM); 257 MARK_TS_COMMON (TEMPLATE_PARM_INDEX); 258 MARK_TS_COMMON (OVERLOAD); 259 MARK_TS_COMMON (TEMPLATE_INFO); 260 MARK_TS_COMMON (TYPENAME_TYPE); 261 MARK_TS_COMMON (TYPEOF_TYPE); 262 MARK_TS_COMMON (UNDERLYING_TYPE); 263 MARK_TS_COMMON (BASELINK); 264 MARK_TS_COMMON (TYPE_PACK_EXPANSION); 265 MARK_TS_COMMON (TYPE_ARGUMENT_PACK); 266 MARK_TS_COMMON (DECLTYPE_TYPE); 267 MARK_TS_COMMON (BOUND_TEMPLATE_TEMPLATE_PARM); 268 MARK_TS_COMMON (UNBOUND_CLASS_TEMPLATE); 269 270 MARK_TS_TYPED (EXPR_PACK_EXPANSION); 271 MARK_TS_TYPED (SWITCH_STMT); 272 MARK_TS_TYPED (IF_STMT); 273 MARK_TS_TYPED (FOR_STMT); 274 MARK_TS_TYPED (RANGE_FOR_STMT); 275 MARK_TS_TYPED (AGGR_INIT_EXPR); 276 MARK_TS_TYPED (EXPR_STMT); 277 MARK_TS_TYPED (EH_SPEC_BLOCK); 278 MARK_TS_TYPED (CLEANUP_STMT); 279 MARK_TS_TYPED (SCOPE_REF); 280 MARK_TS_TYPED (CAST_EXPR); 281 MARK_TS_TYPED (NON_DEPENDENT_EXPR); 282 MARK_TS_TYPED (MODOP_EXPR); 283 MARK_TS_TYPED (TRY_BLOCK); 284 MARK_TS_TYPED (THROW_EXPR); 285 MARK_TS_TYPED (HANDLER); 286 MARK_TS_TYPED (REINTERPRET_CAST_EXPR); 287 MARK_TS_TYPED (CONST_CAST_EXPR); 288 MARK_TS_TYPED (STATIC_CAST_EXPR); 289 MARK_TS_TYPED (DYNAMIC_CAST_EXPR); 290 MARK_TS_TYPED (IMPLICIT_CONV_EXPR); 291 MARK_TS_TYPED (TEMPLATE_ID_EXPR); 292 MARK_TS_TYPED (ARROW_EXPR); 293 MARK_TS_TYPED (SIZEOF_EXPR); 294 MARK_TS_TYPED (ALIGNOF_EXPR); 295 MARK_TS_TYPED (AT_ENCODE_EXPR); 296 MARK_TS_TYPED (UNARY_PLUS_EXPR); 297 MARK_TS_TYPED (TRAIT_EXPR); 298 MARK_TS_TYPED (TYPE_ARGUMENT_PACK); 299 MARK_TS_TYPED (NOEXCEPT_EXPR); 300 MARK_TS_TYPED (NONTYPE_ARGUMENT_PACK); 301 MARK_TS_TYPED (WHILE_STMT); 302 MARK_TS_TYPED (NEW_EXPR); 303 MARK_TS_TYPED (VEC_NEW_EXPR); 304 MARK_TS_TYPED (BREAK_STMT); 305 MARK_TS_TYPED (MEMBER_REF); 306 MARK_TS_TYPED (DOTSTAR_EXPR); 307 MARK_TS_TYPED (DO_STMT); 308 MARK_TS_TYPED (DELETE_EXPR); 309 MARK_TS_TYPED (VEC_DELETE_EXPR); 310 MARK_TS_TYPED (CONTINUE_STMT); 311 MARK_TS_TYPED (TAG_DEFN); 312 MARK_TS_TYPED (PSEUDO_DTOR_EXPR); 313 MARK_TS_TYPED (TYPEID_EXPR); 314 MARK_TS_TYPED (MUST_NOT_THROW_EXPR); 315 MARK_TS_TYPED (STMT_EXPR); 316 MARK_TS_TYPED (OFFSET_REF); 317 MARK_TS_TYPED (OFFSETOF_EXPR); 318 MARK_TS_TYPED (PTRMEM_CST); 319 MARK_TS_TYPED (EMPTY_CLASS_EXPR); 320 MARK_TS_TYPED (VEC_INIT_EXPR); 321 MARK_TS_TYPED (USING_STMT); 322 MARK_TS_TYPED (LAMBDA_EXPR); 323 MARK_TS_TYPED (CTOR_INITIALIZER); 324 } 325 326 #include "gt-cp-cp-objcp-common.h" 327