gcc/cp/cp-objcp-common.c

   1 /* Some code common to C++ and ObjC++ front ends.
   2    Copyright (C) 2004, 2007, 2008, 2009, 2010 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_decl_map_marked_p"), param_is (struct tree_decl_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_decl_map *h, in;
 189   in.base.from = from;
 190
 191   h = (struct tree_decl_map *)
 192       htab_find_with_hash (shadowed_var_for_decl, &in, DECL_UID (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_decl_map *h;
 204   void **loc;
 205
 206   h = GGC_NEW (struct tree_decl_map);
 207   h->base.from = from;
 208   h->to = to;
 209   loc = htab_find_slot_with_hash (shadowed_var_for_decl, h, DECL_UID (from),
 210                                   INSERT);
 211   *(struct tree_decl_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_decl_map_hash,
 218                                            tree_decl_map_eq, 0);
 219 }
 220
 221
 222 #include "gt-cp-cp-objcp-common.h"