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> 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-common.h" 28 #include "toplev.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 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 default: 103 gcc_unreachable (); 104 } 105 /* NOTREACHED */ 106 } 107 108 /* Returns true if T is a variably modified type, in the sense of C99. 109 FN is as passed to variably_modified_p. 110 This routine needs only check cases that cannot be handled by the 111 language-independent logic in tree.c. */ 112 113 bool 114 cp_var_mod_type_p (tree type, tree fn) 115 { 116 /* If TYPE is a pointer-to-member, it is variably modified if either 117 the class or the member are variably modified. */ 118 if (TYPE_PTR_TO_MEMBER_P (type)) 119 return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type), fn) 120 || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type), 121 fn)); 122 123 /* All other types are not variably modified. */ 124 return false; 125 } 126 127 /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed 128 that CONTEXT->printer is an already constructed basic pretty_printer. */ 129 void 130 cxx_initialize_diagnostics (diagnostic_context *context) 131 { 132 pretty_printer *base = context->printer; 133 cxx_pretty_printer *pp = XNEW (cxx_pretty_printer); 134 memcpy (pp_base (pp), base, sizeof (pretty_printer)); 135 pp_cxx_pretty_printer_init (pp); 136 context->printer = (pretty_printer *) pp; 137 138 /* It is safe to free this object because it was previously malloc()'d. */ 139 free (base); 140 } 141 142 /* This compares two types for equivalence ("compatible" in C-based languages). 143 This routine should only return 1 if it is sure. It should not be used 144 in contexts where erroneously returning 0 causes problems. */ 145 146 int 147 cxx_types_compatible_p (tree x, tree y) 148 { 149 return same_type_ignoring_top_level_qualifiers_p (x, y); 150 } 151 152 /* Return true if DECL is explicit member function. */ 153 154 bool 155 cp_function_decl_explicit_p (tree decl) 156 { 157 return (decl 158 && FUNCTION_FIRST_USER_PARMTYPE (decl) != void_list_node 159 && DECL_NONCONVERTING_P (decl)); 160 } 161 162 /* Stubs to keep c-opts.c happy. */ 163 void 164 push_file_scope (void) 165 { 166 } 167 168 void 169 pop_file_scope (void) 170 { 171 } 172 173 /* c-pragma.c needs to query whether a decl has extern "C" linkage. */ 174 bool 175 has_c_linkage (const_tree decl) 176 { 177 return DECL_EXTERN_C_P (decl); 178 } 179 180 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map))) 181 htab_t shadowed_var_for_decl; 182 183 /* Lookup a shadowed var for FROM, and return it if we find one. */ 184 185 tree 186 decl_shadowed_for_var_lookup (tree from) 187 { 188 struct tree_map *h, in; 189 in.base.from = from; 190 191 h = (struct tree_map *) htab_find_with_hash (shadowed_var_for_decl, &in, 192 htab_hash_pointer (from)); 193 if (h) 194 return h->to; 195 return NULL_TREE; 196 } 197 198 /* Insert a mapping FROM->TO in the shadowed var hashtable. */ 199 200 void 201 decl_shadowed_for_var_insert (tree from, tree to) 202 { 203 struct tree_map *h; 204 void **loc; 205 206 h = GGC_NEW (struct tree_map); 207 h->hash = htab_hash_pointer (from); 208 h->base.from = from; 209 h->to = to; 210 loc = htab_find_slot_with_hash (shadowed_var_for_decl, h, h->hash, INSERT); 211 *(struct tree_map **) loc = h; 212 } 213 214 void 215 init_shadowed_var_for_decl (void) 216 { 217 shadowed_var_for_decl = htab_create_ggc (512, tree_map_hash, 218 tree_map_eq, 0); 219 } 220 221 222 #include "gt-cp-cp-objcp-common.h" 223