gcc/c-objc-common.c

   1 /* Some code common to C and ObjC front ends.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007,
   3    2009, 2010 Free Software Foundation, Inc.
   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 "tree.h"
  25 #include "c-tree.h"
  26 #include "intl.h"
  27 #include "c-family/c-pretty-print.h"
  28 #include "flags.h"
  29 #include "diagnostic.h"
  30 #include "tree-pretty-print.h"
  31 #include "langhooks.h"
  32 #include "c-objc-common.h"
  33
  34 static bool c_tree_printer (pretty_printer *, text_info *, const char *,
  35                             int, bool, bool, bool);
  36
  37 bool
  38 c_missing_noreturn_ok_p (tree decl)
  39 {
  40   /* A missing noreturn is not ok for freestanding implementations and
  41      ok for the `main' function in hosted implementations.  */
  42   return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));
  43 }
  44
  45 /* Called from check_global_declarations.  */
  46
  47 bool
  48 c_warn_unused_global_decl (const_tree decl)
  49 {
  50   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
  51     return false;
  52   if (DECL_IN_SYSTEM_HEADER (decl))
  53     return false;
  54
  55   return true;
  56 }
  57
  58 /* Initialization common to C and Objective-C front ends.  */
  59 bool
  60 c_objc_common_init (void)
  61 {
  62   c_init_decl_processing ();
  63
  64   if (c_common_init () == false)
  65     return false;
  66
  67   /* These were not defined in the Objective-C front end, but I'm
  68      putting them here anyway.  The diagnostic format decoder might
  69      want an enhanced ObjC implementation.  */
  70   diagnostic_format_decoder (global_dc) = &c_tree_printer;
  71
  72   return true;
  73 }
  74
  75 /* Called during diagnostic message formatting process to print a
  76    source-level entity onto BUFFER.  The meaning of the format specifiers
  77    is as follows:
  78    %D: a general decl,
  79    %E: an identifier or expression,
  80    %F: a function declaration,
  81    %T: a type.
  82    %V: a list of type qualifiers from a tree.
  83    %v: an explicit list of type qualifiers
  84    %#v: an explicit list of type qualifiers of a function type.
  85
  86    Please notice when called, the `%' part was already skipped by the
  87    diagnostic machinery.  */
  88 static bool
  89 c_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
  90                 int precision, bool wide, bool set_locus, bool hash)
  91 {
  92   tree t = NULL_TREE;
  93   tree name;
  94   c_pretty_printer *cpp = (c_pretty_printer *) pp;
  95   pp->padding = pp_none;
  96
  97   if (precision != 0 || wide)
  98     return false;
  99
 100   if (*spec == 'K')
 101     {
 102       percent_K_format (text);
 103       return true;
 104     }
 105
 106   if (*spec != 'v')
 107     {
 108       t = va_arg (*text->args_ptr, tree);
 109       if (set_locus && text->locus)
 110         *text->locus = DECL_SOURCE_LOCATION (t);
 111     }
 112
 113   switch (*spec)
 114     {
 115     case 'D':
 116       if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
 117         {
 118           t = DECL_DEBUG_EXPR (t);
 119           if (!DECL_P (t))
 120             {
 121               pp_c_expression (cpp, t);
 122               return true;
 123             }
 124         }
 125       /* FALLTHRU */
 126
 127     case 'F':
 128       if (DECL_NAME (t))
 129         {
 130           pp_identifier (cpp, lang_hooks.decl_printable_name (t, 2));
 131           return true;
 132         }
 133       break;
 134
 135     case 'T':
 136       gcc_assert (TYPE_P (t));
 137       name = TYPE_NAME (t);
 138
 139       if (name && TREE_CODE (name) == TYPE_DECL)
 140         {
 141           if (DECL_NAME (name))
 142             pp_identifier (cpp, lang_hooks.decl_printable_name (name, 2));
 143           else
 144             pp_type_id (cpp, t);
 145           return true;
 146         }
 147       else
 148         {
 149           pp_type_id (cpp, t);
 150           return true;
 151         }
 152       break;
 153
 154     case 'E':
 155       if (TREE_CODE (t) == IDENTIFIER_NODE)
 156         pp_identifier (cpp, IDENTIFIER_POINTER (t));
 157       else
 158         pp_expression (cpp, t);
 159       return true;
 160
 161     case 'V':
 162       pp_c_type_qualifier_list (cpp, t);
 163       return true;
 164
 165     case 'v':
 166       pp_c_cv_qualifiers (cpp, va_arg (*text->args_ptr, int), hash);
 167       return true;
 168
 169     default:
 170       return false;
 171     }
 172
 173   pp_string (cpp, _("({anonymous})"));
 174   return true;
 175 }
 176
 177 /* In C and ObjC, all decls have "C" linkage.  */
 178 bool
 179 has_c_linkage (const_tree decl ATTRIBUTE_UNUSED)
 180 {
 181   return true;
 182 }
 183
 184 void
 185 c_initialize_diagnostics (diagnostic_context *context)
 186 {
 187   pretty_printer *base = context->printer;
 188   c_pretty_printer *pp = XNEW (c_pretty_printer);
 189   memcpy (pp_base (pp), base, sizeof (pretty_printer));
 190   pp_c_pretty_printer_init (pp);
 191   context->printer = (pretty_printer *) pp;
 192
 193   /* It is safe to free this object because it was previously XNEW()'d.  */
 194   XDELETE (base);
 195 }
 196
 197 int
 198 c_types_compatible_p (tree x, tree y)
 199 {
 200   return comptypes (TYPE_MAIN_VARIANT (x), TYPE_MAIN_VARIANT (y));
 201 }
 202
 203 /* Determine if the type is a vla type for the backend.  */
 204
 205 bool
 206 c_vla_unspec_p (tree x, tree fn ATTRIBUTE_UNUSED)
 207 {
 208   return c_vla_type_p (x);
 209 }