gcc/gencodes.c

/* Generate from machine description:
   - some macros CODE_FOR_... giving the insn_code_number value
   for each of the defined standard insn names.
   Copyright (C) 1987-2015 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */


#include "bconfig.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "errors.h"
#include "gensupport.h"

static void
gen_insn (rtx insn, int code)
{
  const char *name = XSTR (insn, 0);
  int truth = maybe_eval_c_test (XSTR (insn, 2));

  /* Don't mention instructions whose names are the null string
     or begin with '*'.  They are in the machine description just
     to be recognized.  */
  if (name[0] != 0 && name[0] != '*')
    {
      if (truth == 0)
	printf ("#define CODE_FOR_%s CODE_FOR_nothing\n", name);
      else
	printf ("  CODE_FOR_%s = %d,\n", name, code);
    }
}

int
main (int argc, char **argv)
{
  rtx desc;
  int last = 1;

  progname = "gencodes";

  /* We need to see all the possibilities.  Elided insns may have
     direct references to CODE_FOR_xxx in C code.  */
  insn_elision = 0;

  if (!init_rtx_reader_args (argc, argv))
    return (FATAL_EXIT_CODE);

  puts ("\
/* Generated automatically by the program `gencodes'\n\
   from the machine description file `md'.  */\n\
\n\
#ifndef GCC_INSN_CODES_H\n\
#define GCC_INSN_CODES_H\n\
\n\
enum insn_code {\n\
  CODE_FOR_nothing = 0,\n");

  /* Read the machine description.  */

  while (1)
    {
      int line_no;
      int insn_code_number;

      desc = read_md_rtx (&line_no, &insn_code_number);
      if (desc == NULL)
	break;

      if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
	{
	  gen_insn (desc, insn_code_number);
	  last = insn_code_number + 1;
	}
    }

  printf ("  LAST_INSN_CODE = %d\n\
};\n\
\n\
#endif /* GCC_INSN_CODES_H */\n", last);

  if (ferror (stdout) || fflush (stdout) || fclose (stdout))
    return FATAL_EXIT_CODE;

  return SUCCESS_EXIT_CODE;
}