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-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
  83    These format specifiers form a subset of the format specifiers set used
  84    by the C++ front-end.
  85    Please notice when called, the `%' part was already skipped by the
  86    diagnostic machinery.  */
  87 static bool
  88 c_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
  89                 int precision, bool wide, bool set_locus, bool hash)
  90 {
  91   tree t;
  92   tree name;
  93   c_pretty_printer *cpp = (c_pretty_printer *) pp;
  94   pp->padding = pp_none;
  95
  96   if (precision != 0 || wide || hash)
  97     return false;
  98
  99   if (*spec == 'K')
 100     {
 101       percent_K_format (text);
 102       return true;
 103     }
 104
 105   t = va_arg (*text->args_ptr, tree);
 106
 107   if (set_locus && text->locus)
 108     *text->locus = DECL_SOURCE_LOCATION (t);
 109
 110   switch (*spec)
 111     {
 112     case 'D':
 113       if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
 114         {
 115           t = DECL_DEBUG_EXPR (t);
 116           if (!DECL_P (t))
 117             {
 118               pp_c_expression (cpp, t);
 119               return true;
 120             }
 121         }
 122       /* FALLTHRU */
 123
 124     case 'F':
 125       if (DECL_NAME (t))
 126         {
 127           pp_identifier (cpp, lang_hooks.decl_printable_name (t, 2));
 128           return true;
 129         }
 130       break;
 131
 132     case 'T':
 133       gcc_assert (TYPE_P (t));
 134       name = TYPE_NAME (t);
 135
 136       if (name && TREE_CODE (name) == TYPE_DECL)
 137         {
 138           if (DECL_NAME (name))
 139             pp_identifier (cpp, lang_hooks.decl_printable_name (name, 2));
 140           else
 141             pp_type_id (cpp, t);
 142           return true;
 143         }
 144       else
 145         {
 146           pp_type_id (cpp, t);
 147           return true;
 148         }
 149       break;
 150
 151     case 'E':
 152       if (TREE_CODE (t) == IDENTIFIER_NODE)
 153         pp_identifier (cpp, IDENTIFIER_POINTER (t));
 154       else
 155         pp_expression (cpp, t);
 156       return true;
 157
 158     default:
 159       return false;
 160     }
 161
 162   pp_string (cpp, _("({anonymous})"));
 163   return true;
 164 }
 165
 166 /* In C and ObjC, all decls have "C" linkage.  */
 167 bool
 168 has_c_linkage (const_tree decl ATTRIBUTE_UNUSED)
 169 {
 170   return true;
 171 }
 172
 173 void
 174 c_initialize_diagnostics (diagnostic_context *context)
 175 {
 176   pretty_printer *base = context->printer;
 177   c_pretty_printer *pp = XNEW (c_pretty_printer);
 178   memcpy (pp_base (pp), base, sizeof (pretty_printer));
 179   pp_c_pretty_printer_init (pp);
 180   context->printer = (pretty_printer *) pp;
 181
 182   /* It is safe to free this object because it was previously XNEW()'d.  */
 183   XDELETE (base);
 184 }
 185
 186 int
 187 c_types_compatible_p (tree x, tree y)
 188 {
 189   return comptypes (TYPE_MAIN_VARIANT (x), TYPE_MAIN_VARIANT (y));
 190 }
 191
 192 /* Determine if the type is a vla type for the backend.  */
 193
 194 bool
 195 c_vla_unspec_p (tree x, tree fn ATTRIBUTE_UNUSED)
 196 {
 197   return c_vla_type_p (x);
 198 }