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) 1987-2015 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 (rtx insn, int code)
  33 {
  34   const char *name = XSTR (insn, 0);
  35   int truth = maybe_eval_c_test (XSTR (insn, 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 ("#define CODE_FOR_%s CODE_FOR_nothing\n", name);
  44       else
  45         printf ("  CODE_FOR_%s = %d,\n", name, code);
  46     }
  47 }
  48
  49 int
  50 main (int argc, char **argv)
  51 {
  52   rtx desc;
  53   int last = 1;
  54
  55   progname = "gencodes";
  56
  57   /* We need to see all the possibilities.  Elided insns may have
  58      direct references to CODE_FOR_xxx in C code.  */
  59   insn_elision = 0;
  60
  61   if (!init_rtx_reader_args (argc, argv))
  62     return (FATAL_EXIT_CODE);
  63
  64   puts ("\
  65 /* Generated automatically by the program `gencodes'\n\
  66    from the machine description file `md'.  */\n\
  67 \n\
  68 #ifndef GCC_INSN_CODES_H\n\
  69 #define GCC_INSN_CODES_H\n\
  70 \n\
  71 enum insn_code {\n\
  72   CODE_FOR_nothing = 0,\n");
  73
  74   /* Read the machine description.  */
  75
  76   while (1)
  77     {
  78       int line_no;
  79       int insn_code_number;
  80
  81       desc = read_md_rtx (&line_no, &insn_code_number);
  82       if (desc == NULL)
  83         break;
  84
  85       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
  86         {
  87           gen_insn (desc, insn_code_number);
  88           last = insn_code_number + 1;
  89         }
  90     }
  91
  92   printf ("  LAST_INSN_CODE = %d\n\
  93 };\n\
  94 \n\
  95 #endif /* GCC_INSN_CODES_H */\n", last);
  96
  97   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
  98     return FATAL_EXIT_CODE;
  99
 100   return SUCCESS_EXIT_CODE;
 101 }