gcc/cp/cp-objcp-common.c

   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 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 TREE_BINFO:            return sizeof (struct tree_binfo);
 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_PTR_TO_MEMBER_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 void
 230 cp_common_init_ts (void)
 231 {
 232   unsigned i;
 233
 234   for (i = LAST_AND_UNUSED_TREE_CODE; i < MAX_TREE_CODES; i++)
 235     {
 236       enum tree_node_structure_enum ts_code;
 237       enum tree_code code;
 238
 239       code = (enum tree_code) i;
 240       ts_code = tree_node_structure_for_code (code);
 241       if (ts_code != LAST_TS_ENUM)
 242         {
 243           /* All expressions in C++ are typed.  */
 244           if (ts_code == TS_EXP)
 245             MARK_TS_TYPED (code);
 246           mark_ts_structures_for (code, ts_code);
 247         }
 248       else
 249         {
 250           /* tree_node_structure_for_code does not recognize language
 251              specific nodes (unless they use standard code classes).  */
 252           MARK_TS_COMMON (code);
 253         }
 254     }
 255
 256   /* Consistency checks for codes used in the front end.  */
 257   gcc_assert (tree_contains_struct[NAMESPACE_DECL][TS_DECL_NON_COMMON]);
 258   gcc_assert (tree_contains_struct[USING_DECL][TS_DECL_NON_COMMON]);
 259   gcc_assert (tree_contains_struct[TEMPLATE_DECL][TS_DECL_NON_COMMON]);
 260
 261   gcc_assert (tree_contains_struct[TEMPLATE_TEMPLATE_PARM][TS_COMMON]);
 262   gcc_assert (tree_contains_struct[TEMPLATE_TYPE_PARM][TS_COMMON]);
 263   gcc_assert (tree_contains_struct[TEMPLATE_PARM_INDEX][TS_COMMON]);
 264   gcc_assert (tree_contains_struct[OVERLOAD][TS_COMMON]);
 265   gcc_assert (tree_contains_struct[TEMPLATE_INFO][TS_COMMON]);
 266   gcc_assert (tree_contains_struct[TYPENAME_TYPE][TS_COMMON]);
 267   gcc_assert (tree_contains_struct[TYPEOF_TYPE][TS_COMMON]);
 268   gcc_assert (tree_contains_struct[BASELINK][TS_COMMON]);
 269   gcc_assert (tree_contains_struct[TYPE_PACK_EXPANSION][TS_COMMON]);
 270   gcc_assert (tree_contains_struct[EXPR_PACK_EXPANSION][TS_COMMON]);
 271   gcc_assert (tree_contains_struct[DECLTYPE_TYPE][TS_COMMON]);
 272   gcc_assert (tree_contains_struct[BOUND_TEMPLATE_TEMPLATE_PARM][TS_COMMON]);
 273   gcc_assert (tree_contains_struct[UNBOUND_CLASS_TEMPLATE][TS_COMMON]);
 274
 275   gcc_assert (tree_contains_struct[SWITCH_STMT][TS_TYPED]);
 276   gcc_assert (tree_contains_struct[IF_STMT][TS_TYPED]);
 277   gcc_assert (tree_contains_struct[FOR_STMT][TS_TYPED]);
 278   gcc_assert (tree_contains_struct[RANGE_FOR_STMT][TS_TYPED]);
 279   gcc_assert (tree_contains_struct[AGGR_INIT_EXPR][TS_TYPED]);
 280   gcc_assert (tree_contains_struct[EXPR_STMT][TS_TYPED]);
 281   gcc_assert (tree_contains_struct[EH_SPEC_BLOCK][TS_TYPED]);
 282   gcc_assert (tree_contains_struct[CLEANUP_STMT][TS_TYPED]);
 283   gcc_assert (tree_contains_struct[SCOPE_REF][TS_TYPED]);
 284   gcc_assert (tree_contains_struct[CAST_EXPR][TS_TYPED]);
 285   gcc_assert (tree_contains_struct[NON_DEPENDENT_EXPR][TS_TYPED]);
 286   gcc_assert (tree_contains_struct[MODOP_EXPR][TS_TYPED]);
 287   gcc_assert (tree_contains_struct[TRY_BLOCK][TS_TYPED]);
 288   gcc_assert (tree_contains_struct[THROW_EXPR][TS_TYPED]);
 289   gcc_assert (tree_contains_struct[HANDLER][TS_TYPED]);
 290   gcc_assert (tree_contains_struct[REINTERPRET_CAST_EXPR][TS_TYPED]);
 291   gcc_assert (tree_contains_struct[CONST_CAST_EXPR][TS_TYPED]);
 292   gcc_assert (tree_contains_struct[STATIC_CAST_EXPR][TS_TYPED]);
 293   gcc_assert (tree_contains_struct[DYNAMIC_CAST_EXPR][TS_TYPED]);
 294   gcc_assert (tree_contains_struct[TEMPLATE_ID_EXPR][TS_TYPED]);
 295   gcc_assert (tree_contains_struct[ARROW_EXPR][TS_TYPED]);
 296   gcc_assert (tree_contains_struct[SIZEOF_EXPR][TS_TYPED]);
 297   gcc_assert (tree_contains_struct[ALIGNOF_EXPR][TS_TYPED]);
 298   gcc_assert (tree_contains_struct[AT_ENCODE_EXPR][TS_TYPED]);
 299   gcc_assert (tree_contains_struct[UNARY_PLUS_EXPR][TS_TYPED]);
 300   gcc_assert (tree_contains_struct[TRAIT_EXPR][TS_TYPED]);
 301   gcc_assert (tree_contains_struct[TYPE_ARGUMENT_PACK][TS_TYPED]);
 302   gcc_assert (tree_contains_struct[NOEXCEPT_EXPR][TS_TYPED]);
 303   gcc_assert (tree_contains_struct[NONTYPE_ARGUMENT_PACK][TS_TYPED]);
 304   gcc_assert (tree_contains_struct[WHILE_STMT][TS_TYPED]);
 305   gcc_assert (tree_contains_struct[NEW_EXPR][TS_TYPED]);
 306   gcc_assert (tree_contains_struct[VEC_NEW_EXPR][TS_TYPED]);
 307   gcc_assert (tree_contains_struct[BREAK_STMT][TS_TYPED]);
 308   gcc_assert (tree_contains_struct[MEMBER_REF][TS_TYPED]);
 309   gcc_assert (tree_contains_struct[DOTSTAR_EXPR][TS_TYPED]);
 310   gcc_assert (tree_contains_struct[DO_STMT][TS_TYPED]);
 311   gcc_assert (tree_contains_struct[DELETE_EXPR][TS_TYPED]);
 312   gcc_assert (tree_contains_struct[VEC_DELETE_EXPR][TS_TYPED]);
 313   gcc_assert (tree_contains_struct[CONTINUE_STMT][TS_TYPED]);
 314   gcc_assert (tree_contains_struct[TAG_DEFN][TS_TYPED]);
 315   gcc_assert (tree_contains_struct[PSEUDO_DTOR_EXPR][TS_TYPED]);
 316   gcc_assert (tree_contains_struct[TYPEID_EXPR][TS_TYPED]);
 317   gcc_assert (tree_contains_struct[MUST_NOT_THROW_EXPR][TS_TYPED]);
 318   gcc_assert (tree_contains_struct[STMT_EXPR][TS_TYPED]);
 319   gcc_assert (tree_contains_struct[OFFSET_REF][TS_TYPED]);
 320   gcc_assert (tree_contains_struct[OFFSETOF_EXPR][TS_TYPED]);
 321   gcc_assert (tree_contains_struct[PTRMEM_CST][TS_TYPED]);
 322   gcc_assert (tree_contains_struct[EMPTY_CLASS_EXPR][TS_TYPED]);
 323   gcc_assert (tree_contains_struct[VEC_INIT_EXPR][TS_TYPED]);
 324   gcc_assert (tree_contains_struct[USING_STMT][TS_TYPED]);
 325   gcc_assert (tree_contains_struct[LAMBDA_EXPR][TS_TYPED]);
 326 }
 327
 328 #include "gt-cp-cp-objcp-common.h"