gencodes.c revision 50397 
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, 1995 Free Software Foundation, Inc.
6
7This file is part of GNU CC.
8
9GNU CC is free software; you can redistribute it and/or modify
10it under the terms of the GNU General Public License as published by
11the Free Software Foundation; either version 2, or (at your option)
12any later version.
13
14GNU CC is distributed in the hope that it will be useful,
15but WITHOUT ANY WARRANTY; without even the implied warranty of
16MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17GNU General Public License for more details.
18
19You should have received a copy of the GNU General Public License
20along with GNU CC; see the file COPYING.  If not, write to
21the Free Software Foundation, 59 Temple Place - Suite 330,
22Boston, MA 02111-1307, USA.  */
23
24
25#include "hconfig.h"
26#ifdef __STDC__
27#include <stdarg.h>
28#else
29#include <varargs.h>
30#endif
31#include "system.h"
32#include "rtl.h"
33#include "obstack.h"
34
35static struct obstack obstack;
36struct obstack *rtl_obstack = &obstack;
37
38#define obstack_chunk_alloc xmalloc
39#define obstack_chunk_free free
40
41char *xmalloc PROTO((unsigned));
42static void fatal PVPROTO ((char *, ...)) ATTRIBUTE_PRINTF_1;
43void fancy_abort PROTO((void));
44
45/* Define this so we can link with print-rtl.o to get debug_rtx function.  */
46char **insn_name_ptr = 0;
47
48static int insn_code_number;
49
50static void gen_insn PROTO((rtx));
51
52static void
53gen_insn (insn)
54     rtx insn;
55{
56  /* Don't mention instructions whose names are the null string
57     or begin with '*'.  They are in the machine description just
58     to be recognized.  */
59  if (XSTR (insn, 0)[0] != 0 && XSTR (insn, 0)[0] != '*')
60    printf ("  CODE_FOR_%s = %d,\n", XSTR (insn, 0),
61	    insn_code_number);
62}
63
64char *
65xmalloc (size)
66     unsigned size;
67{
68  register char *val = (char *) malloc (size);
69
70  if (val == 0)
71    fatal ("virtual memory exhausted");
72  return val;
73}
74
75char *
76xrealloc (ptr, size)
77     char *ptr;
78     unsigned size;
79{
80  char *result = (char *) realloc (ptr, size);
81  if (!result)
82    fatal ("virtual memory exhausted");
83  return result;
84}
85
86static void
87fatal VPROTO ((char *format, ...))
88{
89#ifndef __STDC__
90  char *format;
91#endif
92  va_list ap;
93
94  VA_START (ap, format);
95
96#ifndef __STDC__
97  format = va_arg (ap, char *);
98#endif
99
100  fprintf (stderr, "gencodes: ");
101  vfprintf (stderr, format, ap);
102  va_end (ap);
103  fprintf (stderr, "\n");
104  exit (FATAL_EXIT_CODE);
105}
106
107/* More 'friendly' abort that prints the line and file.
108   config.h can #define abort fancy_abort if you like that sort of thing.  */
109
110void
111fancy_abort ()
112{
113  fatal ("Internal gcc abort.");
114}
115
116int
117main (argc, argv)
118     int argc;
119     char **argv;
120{
121  rtx desc;
122  FILE *infile;
123  register int c;
124
125  obstack_init (rtl_obstack);
126
127  if (argc <= 1)
128    fatal ("No input file name.");
129
130  infile = fopen (argv[1], "r");
131  if (infile == 0)
132    {
133      perror (argv[1]);
134      exit (FATAL_EXIT_CODE);
135    }
136
137  init_rtl ();
138
139  printf ("/* Generated automatically by the program `gencodes'\n\
140from the machine description file `md'.  */\n\n");
141
142  printf ("#ifndef MAX_INSN_CODE\n\n");
143
144  /* Read the machine description.  */
145
146  insn_code_number = 0;
147  printf ("enum insn_code {\n");
148
149  while (1)
150    {
151      c = read_skip_spaces (infile);
152      if (c == EOF)
153	break;
154      ungetc (c, infile);
155
156      desc = read_rtx (infile);
157      if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
158	{
159	  gen_insn (desc);
160	  insn_code_number++;
161	}
162      if (GET_CODE (desc) == DEFINE_PEEPHOLE
163	  || GET_CODE (desc) == DEFINE_SPLIT)
164	{
165	  insn_code_number++;
166	}
167    }
168
169  printf ("  CODE_FOR_nothing };\n");
170
171  printf ("\n#define MAX_INSN_CODE ((int) CODE_FOR_nothing)\n");
172
173  printf ("#endif /* MAX_INSN_CODE */\n");
174
175  fflush (stdout);
176  exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
177  /* NOTREACHED */
178  return 0;
179}
180