gcc/common/common-targhooks.c

   1 /* Default common target hook functions.
   2    Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
   3    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 "input.h"
  25 #include "tm.h"
  26 #include "common/common-target.h"
  27 #include "common/common-targhooks.h"
  28
  29 /* Determine the exception handling mechanism for the target.  */
  30
  31 enum unwind_info_type
  32 default_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
  33 {
  34   /* Obey the configure switch to turn on sjlj exceptions.  */
  35 #ifdef CONFIG_SJLJ_EXCEPTIONS
  36   if (CONFIG_SJLJ_EXCEPTIONS)
  37     return UI_SJLJ;
  38 #endif
  39
  40   /* ??? Change all users to the hook, then poison this.  */
  41 #ifdef DWARF2_UNWIND_INFO
  42   if (DWARF2_UNWIND_INFO)
  43     return UI_DWARF2;
  44 #endif
  45
  46   return UI_SJLJ;
  47 }
  48
  49 /* To be used by targets that force dwarf2 unwind enabled.  */
  50
  51 enum unwind_info_type
  52 dwarf2_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
  53 {
  54   /* Obey the configure switch to turn on sjlj exceptions.  */
  55 #ifdef CONFIG_SJLJ_EXCEPTIONS
  56   if (CONFIG_SJLJ_EXCEPTIONS)
  57     return UI_SJLJ;
  58 #endif
  59
  60   return UI_DWARF2;
  61 }
  62
  63 /* To be used by targets that force sjlj unwind enabled.  */
  64
  65 enum unwind_info_type
  66 sjlj_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
  67 {
  68   return UI_SJLJ;
  69 }
  70
  71 /* Default version of TARGET_HANDLE_OPTION.  */
  72
  73 bool
  74 default_target_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED,
  75                               struct gcc_options *opts_set ATTRIBUTE_UNUSED,
  76                               const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
  77                               location_t loc ATTRIBUTE_UNUSED)
  78 {
  79   return true;
  80 }
  81
  82 const struct default_options empty_optimization_table[] =
  83   {
  84     { OPT_LEVELS_NONE, 0, NULL, 0 }
  85   };