1 /* Some code common to C++ and ObjC++ front ends. 2 Copyright (C) 2004, 2007, 2008, 2009, 2010, 2011 3 Free Software Foundation, Inc. 4 Contributed by Ziemowit Laski <zlaski@apple.com> 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 #include "config.h" 23 #include "system.h" 24 #include "coretypes.h" 25 #include "tm.h" 26 #include "tree.h" 27 #include "cp-tree.h" 28 #include "c-family/c-common.h" 29 #include "langhooks.h" 30 #include "langhooks-def.h" 31 #include "diagnostic.h" 32 #include "debug.h" 33 #include "cxx-pretty-print.h" 34 #include "cp-objcp-common.h" 35 36 /* Special routine to get the alias set for C++. */ 37 38 alias_set_type 39 cxx_get_alias_set (tree t) 40 { 41 if (IS_FAKE_BASE_TYPE (t)) 42 /* The base variant of a type must be in the same alias set as the 43 complete type. */ 44 return get_alias_set (TYPE_CONTEXT (t)); 45 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)))) 50 return 0; 51 52 return c_common_get_alias_set (t); 53 } 54 55 /* Called from check_global_declarations. */ 56 57 bool 58 cxx_warn_unused_global_decl (const_tree decl) 59 { 60 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)) 61 return false; 62 if (DECL_IN_SYSTEM_HEADER (decl)) 63 return false; 64 65 /* Const variables take the place of #defines in C++. */ 66 if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl)) 67 return false; 68 69 return true; 70 } 71 72 /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */ 73 size_t 74 cp_tree_size (enum tree_code code) 75 { 76 switch (code) 77 { 78 case PTRMEM_CST: return sizeof (struct ptrmem_cst); 79 case BASELINK: return sizeof (struct tree_baselink); 80 case TEMPLATE_PARM_INDEX: return sizeof (template_parm_index); 81 case DEFAULT_ARG: return sizeof (struct tree_default_arg); 82 case DEFERRED_NOEXCEPT: return sizeof (struct tree_deferred_noexcept); 83 case OVERLOAD: return sizeof (struct tree_overload); 84 case STATIC_ASSERT: return sizeof (struct tree_static_assert); 85 case TYPE_ARGUMENT_PACK: 86 case TYPE_PACK_EXPANSION: 87 return sizeof (struct tree_common); 88 89 case NONTYPE_ARGUMENT_PACK: 90 case EXPR_PACK_EXPANSION: 91 return sizeof (struct tree_exp); 92 93 case ARGUMENT_PACK_SELECT: 94 return sizeof (struct tree_argument_pack_select); 95 96 case TRAIT_EXPR: 97 return sizeof (struct tree_trait_expr); 98 99 case LAMBDA_EXPR: return sizeof (struct tree_lambda_expr); 100 101 case TEMPLATE_INFO: return sizeof (struct tree_template_info); 102 103 case USERDEF_LITERAL: return sizeof (struct tree_userdef_literal); 104 105 default: 106 gcc_unreachable (); 107 } 108 /* NOTREACHED */ 109 } 110 111 /* Returns true if T is a variably modified type, in the sense of C99. 112 FN is as passed to variably_modified_p. 113 This routine needs only check cases that cannot be handled by the 114 language-independent logic in tree.c. */ 115 116 bool 117 cp_var_mod_type_p (tree type, tree fn) 118 { 119 /* If TYPE is a pointer-to-member, it is variably modified if either 120 the class or the member are variably modified. */ 121 if (TYPE_PTR_TO_MEMBER_P (type)) 122 return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type), fn) 123 || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type), 124 fn)); 125 126 /* All other types are not variably modified. */ 127 return false; 128 } 129 130 /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed 131 that CONTEXT->printer is an already constructed basic pretty_printer. */ 132 void 133 cxx_initialize_diagnostics (diagnostic_context *context) 134 { 135 pretty_printer *base; 136 cxx_pretty_printer *pp; 137 138 c_common_initialize_diagnostics (context); 139 140 base = context->printer; 141 pp = XNEW (cxx_pretty_printer); 142 memcpy (pp_base (pp), base, sizeof (pretty_printer)); 143 pp_cxx_pretty_printer_init (pp); 144 context->printer = (pretty_printer *) pp; 145 146 /* It is safe to free this object because it was previously malloc()'d. */ 147 free (base); 148 } 149 150 /* This compares two types for equivalence ("compatible" in C-based languages). 151 This routine should only return 1 if it is sure. It should not be used 152 in contexts where erroneously returning 0 causes problems. */ 153 154 int 155 cxx_types_compatible_p (tree x, tree y) 156 { 157 return same_type_ignoring_top_level_qualifiers_p (x, y); 158 } 159 160 /* Return true if DECL is explicit member function. */ 161 162 bool 163 cp_function_decl_explicit_p (tree decl) 164 { 165 return (decl 166 && FUNCTION_FIRST_USER_PARMTYPE (decl) != void_list_node 167 && DECL_LANG_SPECIFIC (STRIP_TEMPLATE (decl)) 168 && DECL_NONCONVERTING_P (decl)); 169 } 170 171 /* Stubs to keep c-opts.c happy. */ 172 void 173 push_file_scope (void) 174 { 175 } 176 177 void 178 pop_file_scope (void) 179 { 180 } 181 182 /* c-pragma.c needs to query whether a decl has extern "C" linkage. */ 183 bool 184 has_c_linkage (const_tree decl) 185 { 186 return DECL_EXTERN_C_P (decl); 187 } 188 189 static GTY ((if_marked ("tree_decl_map_marked_p"), param_is (struct tree_decl_map))) 190 htab_t shadowed_var_for_decl; 191 192 /* Lookup a shadowed var for FROM, and return it if we find one. */ 193 194 tree 195 decl_shadowed_for_var_lookup (tree from) 196 { 197 struct tree_decl_map *h, in; 198 in.base.from = from; 199 200 h = (struct tree_decl_map *) 201 htab_find_with_hash (shadowed_var_for_decl, &in, DECL_UID (from)); 202 if (h) 203 return h->to; 204 return NULL_TREE; 205 } 206 207 /* Insert a mapping FROM->TO in the shadowed var hashtable. */ 208 209 void 210 decl_shadowed_for_var_insert (tree from, tree to) 211 { 212 struct tree_decl_map *h; 213 void **loc; 214 215 h = ggc_alloc_tree_decl_map (); 216 h->base.from = from; 217 h->to = to; 218 loc = htab_find_slot_with_hash (shadowed_var_for_decl, h, DECL_UID (from), 219 INSERT); 220 *(struct tree_decl_map **) loc = h; 221 } 222 223 void 224 init_shadowed_var_for_decl (void) 225 { 226 shadowed_var_for_decl = htab_create_ggc (512, tree_decl_map_hash, 227 tree_decl_map_eq, 0); 228 } 229 230 /* Return true if stmt can fall thru. Used by block_may_fallthru 231 default case. */ 232 233 bool 234 cxx_block_may_fallthru (const_tree stmt) 235 { 236 switch (TREE_CODE (stmt)) 237 { 238 case EXPR_STMT: 239 return block_may_fallthru (EXPR_STMT_EXPR (stmt)); 240 241 case THROW_EXPR: 242 return false; 243 244 default: 245 return true; 246 } 247 } 248 249 void 250 cp_common_init_ts (void) 251 { 252 MARK_TS_DECL_NON_COMMON (NAMESPACE_DECL); 253 MARK_TS_DECL_NON_COMMON (USING_DECL); 254 MARK_TS_DECL_NON_COMMON (TEMPLATE_DECL); 255 256 MARK_TS_COMMON (TEMPLATE_TEMPLATE_PARM); 257 MARK_TS_COMMON (TEMPLATE_TYPE_PARM); 258 MARK_TS_COMMON (TEMPLATE_PARM_INDEX); 259 MARK_TS_COMMON (OVERLOAD); 260 MARK_TS_COMMON (TEMPLATE_INFO); 261 MARK_TS_COMMON (TYPENAME_TYPE); 262 MARK_TS_COMMON (TYPEOF_TYPE); 263 MARK_TS_COMMON (UNDERLYING_TYPE); 264 MARK_TS_COMMON (BASELINK); 265 MARK_TS_COMMON (TYPE_PACK_EXPANSION); 266 MARK_TS_COMMON (TYPE_ARGUMENT_PACK); 267 MARK_TS_COMMON (DECLTYPE_TYPE); 268 MARK_TS_COMMON (BOUND_TEMPLATE_TEMPLATE_PARM); 269 MARK_TS_COMMON (UNBOUND_CLASS_TEMPLATE); 270 271 MARK_TS_TYPED (EXPR_PACK_EXPANSION); 272 MARK_TS_TYPED (SWITCH_STMT); 273 MARK_TS_TYPED (IF_STMT); 274 MARK_TS_TYPED (FOR_STMT); 275 MARK_TS_TYPED (RANGE_FOR_STMT); 276 MARK_TS_TYPED (AGGR_INIT_EXPR); 277 MARK_TS_TYPED (EXPR_STMT); 278 MARK_TS_TYPED (EH_SPEC_BLOCK); 279 MARK_TS_TYPED (CLEANUP_STMT); 280 MARK_TS_TYPED (SCOPE_REF); 281 MARK_TS_TYPED (CAST_EXPR); 282 MARK_TS_TYPED (NON_DEPENDENT_EXPR); 283 MARK_TS_TYPED (MODOP_EXPR); 284 MARK_TS_TYPED (TRY_BLOCK); 285 MARK_TS_TYPED (THROW_EXPR); 286 MARK_TS_TYPED (HANDLER); 287 MARK_TS_TYPED (REINTERPRET_CAST_EXPR); 288 MARK_TS_TYPED (CONST_CAST_EXPR); 289 MARK_TS_TYPED (STATIC_CAST_EXPR); 290 MARK_TS_TYPED (DYNAMIC_CAST_EXPR); 291 MARK_TS_TYPED (IMPLICIT_CONV_EXPR); 292 MARK_TS_TYPED (TEMPLATE_ID_EXPR); 293 MARK_TS_TYPED (ARROW_EXPR); 294 MARK_TS_TYPED (SIZEOF_EXPR); 295 MARK_TS_TYPED (ALIGNOF_EXPR); 296 MARK_TS_TYPED (AT_ENCODE_EXPR); 297 MARK_TS_TYPED (UNARY_PLUS_EXPR); 298 MARK_TS_TYPED (TRAIT_EXPR); 299 MARK_TS_TYPED (TYPE_ARGUMENT_PACK); 300 MARK_TS_TYPED (NOEXCEPT_EXPR); 301 MARK_TS_TYPED (NONTYPE_ARGUMENT_PACK); 302 MARK_TS_TYPED (WHILE_STMT); 303 MARK_TS_TYPED (NEW_EXPR); 304 MARK_TS_TYPED (VEC_NEW_EXPR); 305 MARK_TS_TYPED (BREAK_STMT); 306 MARK_TS_TYPED (MEMBER_REF); 307 MARK_TS_TYPED (DOTSTAR_EXPR); 308 MARK_TS_TYPED (DO_STMT); 309 MARK_TS_TYPED (DELETE_EXPR); 310 MARK_TS_TYPED (VEC_DELETE_EXPR); 311 MARK_TS_TYPED (CONTINUE_STMT); 312 MARK_TS_TYPED (TAG_DEFN); 313 MARK_TS_TYPED (PSEUDO_DTOR_EXPR); 314 MARK_TS_TYPED (TYPEID_EXPR); 315 MARK_TS_TYPED (MUST_NOT_THROW_EXPR); 316 MARK_TS_TYPED (STMT_EXPR); 317 MARK_TS_TYPED (OFFSET_REF); 318 MARK_TS_TYPED (OFFSETOF_EXPR); 319 MARK_TS_TYPED (PTRMEM_CST); 320 MARK_TS_TYPED (EMPTY_CLASS_EXPR); 321 MARK_TS_TYPED (VEC_INIT_EXPR); 322 MARK_TS_TYPED (USING_STMT); 323 MARK_TS_TYPED (LAMBDA_EXPR); 324 MARK_TS_TYPED (CTOR_INITIALIZER); 325 } 326 327 #include "gt-cp-cp-objcp-common.h" 328