contrib/gcc-8.0/gcc/common/common-targhooks.c

   1 /* Default common target hook functions.
   2    Copyright (C) 2003-2018 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tm.h"
  24 #include "common/common-target.h"
  25 #include "common/common-targhooks.h"
  26
  27 /* Determine the exception handling mechanism for the target.  */
  28
  29 enum unwind_info_type
  30 default_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
  31 {
  32   /* Obey the configure switch to turn on sjlj exceptions.  */
  33 #ifdef CONFIG_SJLJ_EXCEPTIONS
  34   if (CONFIG_SJLJ_EXCEPTIONS)
  35     return UI_SJLJ;
  36 #endif
  37
  38   /* ??? Change all users to the hook, then poison this.  */
  39 #ifdef DWARF2_UNWIND_INFO
  40   if (DWARF2_UNWIND_INFO)
  41     return UI_DWARF2;
  42 #endif
  43
  44   return UI_SJLJ;
  45 }
  46
  47 /* To be used by targets that force dwarf2 unwind enabled.  */
  48
  49 enum unwind_info_type
  50 dwarf2_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
  51 {
  52   /* Obey the configure switch to turn on sjlj exceptions.  */
  53 #ifdef CONFIG_SJLJ_EXCEPTIONS
  54   if (CONFIG_SJLJ_EXCEPTIONS)
  55     return UI_SJLJ;
  56 #endif
  57
  58   return UI_DWARF2;
  59 }
  60
  61 /* To be used by targets that force sjlj unwind enabled.  */
  62
  63 enum unwind_info_type
  64 sjlj_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
  65 {
  66   return UI_SJLJ;
  67 }
  68
  69 /* Default version of TARGET_HANDLE_OPTION.  */
  70
  71 bool
  72 default_target_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED,
  73                               struct gcc_options *opts_set ATTRIBUTE_UNUSED,
  74                               const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
  75                               location_t loc ATTRIBUTE_UNUSED)
  76 {
  77   return true;
  78 }
  79
  80 const struct default_options empty_optimization_table[] =
  81   {
  82     { OPT_LEVELS_NONE, 0, NULL, 0 }
  83   };