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Annotation of gcc/genflags.c, revision 1.1.1.3

1.1       root        1: /* Generate from machine description:
                      2: 
                      3:    - some flags HAVE_... saying which simple standard instructions are
                      4:    available for this machine.
                      5:    Copyright (C) 1987 Free Software Foundation, Inc.
                      6: 
                      7: This file is part of GNU CC.
                      8: 
                      9: GNU CC is distributed in the hope that it will be useful,
                     10: but WITHOUT ANY WARRANTY.  No author or distributor
                     11: accepts responsibility to anyone for the consequences of using it
                     12: or for whether it serves any particular purpose or works at all,
                     13: unless he says so in writing.  Refer to the GNU CC General Public
                     14: License for full details.
                     15: 
                     16: Everyone is granted permission to copy, modify and redistribute
                     17: GNU CC, but only under the conditions described in the
                     18: GNU CC General Public License.   A copy of this license is
                     19: supposed to have been given to you along with GNU CC so you
                     20: can know your rights and responsibilities.  It should be in a
                     21: file named COPYING.  Among other things, the copyright notice
                     22: and this notice must be preserved on all copies.  */
                     23: 
                     24: 
                     25: #include <stdio.h>
1.1.1.2   root       26: #include "config.h"
1.1       root       27: #include "rtl.h"
1.1.1.2   root       28: #include "obstack.h"
1.1       root       29: 
                     30: struct obstack obstack;
1.1.1.2   root       31: struct obstack *rtl_obstack = &obstack;
1.1       root       32: 
                     33: #define obstack_chunk_alloc xmalloc
                     34: #define obstack_chunk_free free
                     35: extern int xmalloc ();
                     36: extern void free ();
                     37: 
                     38: void fatal ();
                     39: 
                     40: void
                     41: gen_insn (insn)
                     42:      rtx insn;
                     43: {
                     44:   /* Don't mention instructions whose names are the null string.
                     45:      They are in the machine description just to be recognized.  */
                     46:   if (strlen (XSTR (insn, 0)) == 0)
                     47:     return;
                     48: 
1.1.1.3 ! root       49:   printf ("#define HAVE_%s (%s)\n", XSTR (insn, 0),
1.1       root       50:          strlen (XSTR (insn, 2)) ? XSTR (insn, 2) : "1");
                     51:   printf ("extern rtx gen_%s ();\n", XSTR (insn, 0));
                     52: }
                     53: 
1.1.1.2   root       54: int
1.1       root       55: xmalloc (size)
                     56: {
                     57:   register int val = malloc (size);
                     58: 
                     59:   if (val == 0)
1.1.1.2   root       60:     fatal ("virtual memory exhausted");
1.1       root       61: 
                     62:   return val;
                     63: }
                     64: 
                     65: int
                     66: xrealloc (ptr, size)
                     67:      char *ptr;
                     68:      int size;
                     69: {
                     70:   int result = realloc (ptr, size);
                     71:   if (!result)
1.1.1.2   root       72:     fatal ("virtual memory exhausted");
1.1       root       73:   return result;
                     74: }
                     75: 
                     76: void
                     77: fatal (s, a1, a2)
                     78: {
                     79:   fprintf (stderr, "genflags: ");
                     80:   fprintf (stderr, s, a1, a2);
                     81:   fprintf (stderr, "\n");
1.1.1.2   root       82:   exit (FATAL_EXIT_CODE);
1.1       root       83: }
                     84: 
1.1.1.2   root       85: int
1.1       root       86: main (argc, argv)
                     87:      int argc;
                     88:      char **argv;
                     89: {
                     90:   rtx desc;
                     91:   FILE *infile;
                     92:   extern rtx read_rtx ();
                     93:   register int c;
                     94: 
1.1.1.2   root       95:   obstack_init (rtl_obstack);
1.1       root       96: 
                     97:   if (argc <= 1)
                     98:     fatal ("No input file name.");
                     99: 
                    100:   infile = fopen (argv[1], "r");
                    101:   if (infile == 0)
                    102:     {
                    103:       perror (argv[1]);
1.1.1.2   root      104:       exit (FATAL_EXIT_CODE);
1.1       root      105:     }
                    106: 
                    107:   init_rtl ();
                    108: 
                    109:   printf ("/* Generated automatically by the program `genflags'\n\
                    110: from the machine description file `md'.  */\n\n");
                    111: 
                    112:   /* Read the machine description.  */
                    113: 
                    114:   while (1)
                    115:     {
                    116:       c = read_skip_spaces (infile);
                    117:       if (c == EOF)
                    118:        break;
                    119:       ungetc (c, infile);
                    120: 
                    121:       desc = read_rtx (infile);
1.1.1.2   root      122:       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
                    123:        gen_insn (desc);
1.1       root      124:     }
                    125: 
1.1.1.2   root      126:   fflush (stdout);
                    127:   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
1.1       root      128: }

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