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Annotation of researchv10dc/cmd/gcc/genflags.c, revision 1.1

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>
        !            26: #include "config.h"
        !            27: #include "rtl.h"
        !            28: #include "obstack.h"
        !            29: 
        !            30: struct obstack obstack;
        !            31: struct obstack *rtl_obstack = &obstack;
        !            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: 
        !            49:   printf ("#define HAVE_%s %s\n", XSTR (insn, 0),
        !            50:          strlen (XSTR (insn, 2)) ? XSTR (insn, 2) : "1");
        !            51:   printf ("extern rtx gen_%s ();\n", XSTR (insn, 0));
        !            52: }
        !            53: 
        !            54: int
        !            55: xmalloc (size)
        !            56: {
        !            57:   register int val = malloc (size);
        !            58: 
        !            59:   if (val == 0)
        !            60:     fatal ("virtual memory exhausted");
        !            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)
        !            72:     fatal ("virtual memory exhausted");
        !            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");
        !            82:   exit (FATAL_EXIT_CODE);
        !            83: }
        !            84: 
        !            85: int
        !            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: 
        !            95:   obstack_init (rtl_obstack);
        !            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]);
        !           104:       exit (FATAL_EXIT_CODE);
        !           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);
        !           122:       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
        !           123:        gen_insn (desc);
        !           124:     }
        !           125: 
        !           126:   fflush (stdout);
        !           127:   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
        !           128: }

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