1/* Default common target hook functions.
2   Copyright (C) 2003-2020 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along 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
30enum unwind_info_type
31default_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
50enum unwind_info_type
51dwarf2_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
64enum unwind_info_type
65sjlj_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
66{
67  return UI_SJLJ;
68}
69
70/* Default version of TARGET_HANDLE_OPTION.  */
71
72bool
73default_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
83vec<const char *>
84default_get_valid_option_values (int, const char *)
85{
86  return vec<const char *> ();
87}
88
89const struct default_options empty_optimization_table[] =
90  {
91    { OPT_LEVELS_NONE, 0, NULL, 0 }
92  };
93