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 #include "opts.h"
  27
  28 /* Determine the exception handling mechanism for the target.  */
  29
  30 enum unwind_info_type
  31 default_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
  32 {
  33   /* Obey the configure switch to turn on sjlj exceptions.  */
  34 #ifdef CONFIG_SJLJ_EXCEPTIONS
  35   if (CONFIG_SJLJ_EXCEPTIONS)
  36     return UI_SJLJ;
  37 #endif
  38
  39   /* ??? Change all users to the hook, then poison this.  */
  40 #ifdef DWARF2_UNWIND_INFO
  41   if (DWARF2_UNWIND_INFO)
  42     return UI_DWARF2;
  43 #endif
  44
  45   return UI_SJLJ;
  46 }
  47
  48 /* To be used by targets that force dwarf2 unwind enabled.  */
  49
  50 enum unwind_info_type
  51 dwarf2_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
  52 {
  53   /* Obey the configure switch to turn on sjlj exceptions.  */
  54 #ifdef CONFIG_SJLJ_EXCEPTIONS
  55   if (CONFIG_SJLJ_EXCEPTIONS)
  56     return UI_SJLJ;
  57 #endif
  58
  59   return UI_DWARF2;
  60 }
  61
  62 /* To be used by targets that force sjlj unwind enabled.  */
  63
  64 enum unwind_info_type
  65 sjlj_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
  66 {
  67   return UI_SJLJ;
  68 }
  69
  70 /* Default version of TARGET_HANDLE_OPTION.  */
  71
  72 bool
  73 default_target_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED,
  74                               struct gcc_options *opts_set ATTRIBUTE_UNUSED,
  75                               const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
  76                               location_t loc ATTRIBUTE_UNUSED)
  77 {
  78   return true;
  79 }
  80
  81 /* Default version of TARGET_GET_VALID_OPTION_VALUES.  */
  82
  83 vec<const char *>
  84 default_get_valid_option_values (int, const char *)
  85 {
  86   return vec<const char *> ();
  87 }
  88
  89 /* Default version of TARGET_OPTION_VALIDATE_PARAM.  */
  90
  91 bool
  92 default_option_validate_param (const int value ATTRIBUTE_UNUSED,
  93                                const int param ATTRIBUTE_UNUSED)
  94 {
  95   return true;
  96 }
  97
  98 const struct default_options empty_optimization_table[] =
  99   {
 100     { OPT_LEVELS_NONE, 0, NULL, 0 }
 101   };