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Annotation of gcc/gencodes.c, revision 1.1.1.1

1.1       root        1: /* Generate from machine description:
                      2: 
                      3:    - some macros CODE_FOR_... giving the insn_code_number value
                      4:    for each of the defined standard insn names.
                      5:    Copyright (C) 1987, 1991 Free Software Foundation, Inc.
                      6: 
                      7: This file is part of GNU CC.
                      8: 
                      9: GNU CC is free software; you can redistribute it and/or modify
                     10: it under the terms of the GNU General Public License as published by
                     11: the Free Software Foundation; either version 2, or (at your option)
                     12: any later version.
                     13: 
                     14: GNU CC is distributed in the hope that it will be useful,
                     15: but WITHOUT ANY WARRANTY; without even the implied warranty of
                     16: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     17: GNU General Public License for more details.
                     18: 
                     19: You should have received a copy of the GNU General Public License
                     20: along with GNU CC; see the file COPYING.  If not, write to
                     21: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
                     22: 
                     23: 
                     24: #include <stdio.h>
                     25: #include "config.h"
                     26: #include "rtl.h"
                     27: #include "obstack.h"
                     28: 
                     29: static struct obstack obstack;
                     30: struct obstack *rtl_obstack = &obstack;
                     31: 
                     32: #define obstack_chunk_alloc xmalloc
                     33: #define obstack_chunk_free free
                     34: 
                     35: extern void free ();
                     36: 
                     37: char *xmalloc ();
                     38: static void fatal ();
                     39: void fancy_abort ();
                     40: 
                     41: static int insn_code_number;
                     42: 
                     43: static void
                     44: gen_insn (insn)
                     45:      rtx insn;
                     46: {
                     47:   /* Don't mention instructions whose names are the null string.
                     48:      They are in the machine description just to be recognized.  */
                     49:   if (strlen (XSTR (insn, 0)) != 0)
                     50:     printf ("  CODE_FOR_%s = %d,\n", XSTR (insn, 0),
                     51:            insn_code_number);
                     52: }
                     53: 
                     54: char *
                     55: xmalloc (size)
                     56:      unsigned size;
                     57: {
                     58:   register char *val = (char *) malloc (size);
                     59: 
                     60:   if (val == 0)
                     61:     fatal ("virtual memory exhausted");
                     62:   return val;
                     63: }
                     64: 
                     65: char *
                     66: xrealloc (ptr, size)
                     67:      char *ptr;
                     68:      unsigned size;
                     69: {
                     70:   char *result = (char *) realloc (ptr, size);
                     71:   if (!result)
                     72:     fatal ("virtual memory exhausted");
                     73:   return result;
                     74: }
                     75: 
                     76: static void
                     77: fatal (s, a1, a2)
                     78:      char *s;
                     79: {
                     80:   fprintf (stderr, "gencodes: ");
                     81:   fprintf (stderr, s, a1, a2);
                     82:   fprintf (stderr, "\n");
                     83:   exit (FATAL_EXIT_CODE);
                     84: }
                     85: 
                     86: /* More 'friendly' abort that prints the line and file.
                     87:    config.h can #define abort fancy_abort if you like that sort of thing.  */
                     88: 
                     89: void
                     90: fancy_abort ()
                     91: {
                     92:   fatal ("Internal gcc abort.");
                     93: }
                     94: 
                     95: int
                     96: main (argc, argv)
                     97:      int argc;
                     98:      char **argv;
                     99: {
                    100:   rtx desc;
                    101:   FILE *infile;
                    102:   extern rtx read_rtx ();
                    103:   register int c;
                    104: 
                    105:   obstack_init (rtl_obstack);
                    106: 
                    107:   if (argc <= 1)
                    108:     fatal ("No input file name.");
                    109: 
                    110:   infile = fopen (argv[1], "r");
                    111:   if (infile == 0)
                    112:     {
                    113:       perror (argv[1]);
                    114:       exit (FATAL_EXIT_CODE);
                    115:     }
                    116: 
                    117:   init_rtl ();
                    118: 
                    119:   printf ("/* Generated automatically by the program `gencodes'\n\
                    120: from the machine description file `md'.  */\n\n");
                    121: 
                    122:   printf ("#ifndef MAX_INSN_CODE\n\n");
                    123: 
                    124:   /* Read the machine description.  */
                    125: 
                    126:   insn_code_number = 0;
                    127:   printf ("enum insn_code {\n");
                    128: 
                    129:   while (1)
                    130:     {
                    131:       c = read_skip_spaces (infile);
                    132:       if (c == EOF)
                    133:        break;
                    134:       ungetc (c, infile);
                    135: 
                    136:       desc = read_rtx (infile);
                    137:       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
                    138:        {
                    139:          gen_insn (desc);
                    140:          insn_code_number++;
                    141:        }
                    142:       if (GET_CODE (desc) == DEFINE_PEEPHOLE
                    143:          || GET_CODE (desc) == DEFINE_SPLIT)
                    144:        {
                    145:          insn_code_number++;
                    146:        }
                    147:     }
                    148: 
                    149:   printf ("  CODE_FOR_nothing };\n");
                    150: 
                    151:   printf ("\n#define MAX_INSN_CODE ((int) CODE_FOR_nothing)\n");
                    152: 
                    153:   printf ("#endif /* MAX_INSN_CODE */\n");
                    154: 
                    155:   fflush (stdout);
                    156:   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
                    157:   /* NOTREACHED */
                    158:   return 0;
                    159: }

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