gcc/common/config/arm/arm-common.c

   1 /* Common hooks for ARM.
   2    Copyright (C) 1991-2014 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
   7    under the terms of the GNU General Public License as published
   8    by the Free Software Foundation; either version 3, or (at your
   9    option) any later version.
  10
  11    GCC is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License 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 "tm_p.h"
  25 #include "common/common-target.h"
  26 #include "common/common-target-def.h"
  27 #include "opts.h"
  28 #include "flags.h"
  29
  30 /* Set default optimization options.  */
  31 static const struct default_options arm_option_optimization_table[] =
  32   {
  33     /* Enable section anchors by default at -O1 or higher.  */
  34     { OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
  35     { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
  36     { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
  37     { OPT_LEVELS_NONE, 0, NULL, 0 }
  38   };
  39
  40 /* Implement TARGET_EXCEPT_UNWIND_INFO.  */
  41
  42 enum unwind_info_type
  43 arm_except_unwind_info (struct gcc_options *opts)
  44 {
  45   /* Honor the --enable-sjlj-exceptions configure switch.  */
  46 #ifdef CONFIG_SJLJ_EXCEPTIONS
  47   if (CONFIG_SJLJ_EXCEPTIONS)
  48     return UI_SJLJ;
  49 #endif
  50
  51   /* If not using ARM EABI unwind tables... */
  52   if (ARM_UNWIND_INFO)
  53     {
  54       /* For simplicity elsewhere in this file, indicate that all unwind
  55          info is disabled if we're not emitting unwind tables.  */
  56       if (!opts->x_flag_exceptions && !opts->x_flag_unwind_tables)
  57         return UI_NONE;
  58       else
  59         return UI_TARGET;
  60     }
  61
  62   /* ... we use sjlj exceptions for backwards compatibility.  */
  63   return UI_SJLJ;
  64 }
  65
  66 #define ARM_CPU_NAME_LENGTH 20
  67
  68 /* Truncate NAME at the first '.' character seen, or return
  69    NAME unmodified.  */
  70
  71 const char *
  72 arm_rewrite_selected_cpu (const char *name)
  73 {
  74   static char output_buf[ARM_CPU_NAME_LENGTH + 1] = {0};
  75   char *arg_pos;
  76
  77   strncpy (output_buf, name, ARM_CPU_NAME_LENGTH);
  78   arg_pos = strchr (output_buf, '.');
  79
  80   /* If we found a '.' truncate the entry at that point.  */
  81   if (arg_pos)
  82     *arg_pos = '\0';
  83
  84   return output_buf;
  85 }
  86
  87 /* Called by the driver to rewrite a name passed to the -mcpu
  88    argument in preparation to be passed to the assembler.  The
  89    name will be in ARGV[0], ARGC should always be 1.  */
  90
  91 const char *
  92 arm_rewrite_mcpu (int argc, const char **argv)
  93 {
  94   gcc_assert (argc == 1);
  95   return arm_rewrite_selected_cpu (argv[0]);
  96 }
  97
  98 #undef ARM_CPU_NAME_LENGTH
  99
 100
 101 #undef  TARGET_DEFAULT_TARGET_FLAGS
 102 #define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT | MASK_SCHED_PROLOG)
 103
 104 #undef  TARGET_OPTION_OPTIMIZATION_TABLE
 105 #define TARGET_OPTION_OPTIMIZATION_TABLE arm_option_optimization_table
 106
 107 #undef TARGET_EXCEPT_UNWIND_INFO
 108 #define TARGET_EXCEPT_UNWIND_INFO  arm_except_unwind_info
 109
 110 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;