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