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Annotation of gcc/genflags.c, revision 1.1.1.5

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: 
1.1.1.4   root        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 1, or (at your option)
                     12: any later version.
                     13: 
1.1       root       14: GNU CC is distributed in the hope that it will be useful,
1.1.1.4   root       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.  */
1.1       root       22: 
                     23: 
                     24: #include <stdio.h>
1.1.1.2   root       25: #include "config.h"
1.1       root       26: #include "rtl.h"
1.1.1.2   root       27: #include "obstack.h"
1.1       root       28: 
                     29: struct obstack obstack;
1.1.1.2   root       30: struct obstack *rtl_obstack = &obstack;
1.1       root       31: 
                     32: #define obstack_chunk_alloc xmalloc
                     33: #define obstack_chunk_free free
                     34: extern int xmalloc ();
                     35: extern void free ();
                     36: 
                     37: void fatal ();
1.1.1.5 ! root       38: void fancy_abort ();
1.1       root       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)
1.1.1.5 ! root       78:      char *s;
1.1       root       79: {
                     80:   fprintf (stderr, "genflags: ");
                     81:   fprintf (stderr, s, a1, a2);
                     82:   fprintf (stderr, "\n");
1.1.1.2   root       83:   exit (FATAL_EXIT_CODE);
1.1       root       84: }
1.1.1.5 ! root       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: }
1.1       root       94: 
1.1.1.2   root       95: int
1.1       root       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: 
1.1.1.2   root      105:   obstack_init (rtl_obstack);
1.1       root      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]);
1.1.1.2   root      114:       exit (FATAL_EXIT_CODE);
1.1       root      115:     }
                    116: 
                    117:   init_rtl ();
                    118: 
                    119:   printf ("/* Generated automatically by the program `genflags'\n\
                    120: from the machine description file `md'.  */\n\n");
                    121: 
                    122:   /* Read the machine description.  */
                    123: 
                    124:   while (1)
                    125:     {
                    126:       c = read_skip_spaces (infile);
                    127:       if (c == EOF)
                    128:        break;
                    129:       ungetc (c, infile);
                    130: 
                    131:       desc = read_rtx (infile);
1.1.1.2   root      132:       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
                    133:        gen_insn (desc);
1.1       root      134:     }
                    135: 
1.1.1.2   root      136:   fflush (stdout);
                    137:   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
1.1       root      138: }

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