gcc/gencodes.c

   1 /* Generate from machine description:
   2    - some macros CODE_FOR_... giving the insn_code_number value
   3    for each of the defined standard insn names.
   4    Copyright (C) 1987-2021 Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22
  23 #include "bconfig.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "tm.h"
  27 #include "rtl.h"
  28 #include "errors.h"
  29 #include "gensupport.h"
  30
  31 static void
  32 gen_insn (md_rtx_info *info)
  33 {
  34   const char *name = XSTR (info->def, 0);
  35   int truth = maybe_eval_c_test (XSTR (info->def, 2));
  36
  37   /* Don't mention instructions whose names are the null string
  38      or begin with '*'.  They are in the machine description just
  39      to be recognized.  */
  40   if (name[0] != 0 && name[0] != '*')
  41     {
  42       if (truth == 0)
  43         printf (",\n   CODE_FOR_%s = CODE_FOR_nothing", name);
  44       else
  45         printf (",\n  CODE_FOR_%s = %d", name, info->index);
  46     }
  47 }
  48
  49 int
  50 main (int argc, const char **argv)
  51 {
  52   progname = "gencodes";
  53
  54   /* We need to see all the possibilities.  Elided insns may have
  55      direct references to CODE_FOR_xxx in C code.  */
  56   insn_elision = 0;
  57
  58   if (!init_rtx_reader_args (argc, argv))
  59     return (FATAL_EXIT_CODE);
  60
  61   printf ("\
  62 /* Generated automatically by the program `gencodes'\n\
  63    from the machine description file `md'.  */\n\
  64 \n\
  65 #ifndef GCC_INSN_CODES_H\n\
  66 #define GCC_INSN_CODES_H\n\
  67 \n\
  68 enum insn_code {\n\
  69   CODE_FOR_nothing = 0");
  70
  71   /* Read the machine description.  */
  72
  73   md_rtx_info info;
  74   while (read_md_rtx (&info))
  75     switch (GET_CODE (info.def))
  76       {
  77       case DEFINE_INSN:
  78       case DEFINE_EXPAND:
  79         gen_insn (&info);
  80         break;
  81
  82       default:
  83         break;
  84     }
  85
  86   printf ("\n};\n\
  87 \n\
  88 const unsigned int NUM_INSN_CODES = %d;\n\
  89 #endif /* GCC_INSN_CODES_H */\n", get_num_insn_codes ());
  90
  91   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
  92     return FATAL_EXIT_CODE;
  93
  94   return SUCCESS_EXIT_CODE;
  95 }