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Education Sampler 1992 [NeXTSTEP]
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cc-61.0.1
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cc
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genflags.c
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1991-06-03
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/* Generate from machine description:
- some flags HAVE_... saying which simple standard instructions are
available for this machine.
Copyright (C) 1987 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include "config.h"
#include "rtl.h"
#include "obstack.h"
struct obstack obstack;
struct obstack *rtl_obstack = &obstack;
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
extern int xmalloc ();
extern void free ();
void fatal ();
void fancy_abort ();
void
gen_insn (insn)
rtx insn;
{
char *p;
/* Don't mention instructions whose names are the null string.
They are in the machine description just to be recognized. */
if (strlen (XSTR (insn, 0)) == 0)
return;
printf ("#define HAVE_%s ", XSTR (insn, 0));
if (strlen (XSTR (insn, 2)) == 0)
printf ("1\n");
else
{
/* Write the macro definition, putting \'s at the end of each line,
if more than one. */
printf ("(");
for (p = XSTR (insn, 2); *p; p++)
{
if (*p == '\n')
printf (" \\\n");
else
printf ("%c", *p);
}
printf (")\n");
}
printf ("extern rtx gen_%s ();\n", XSTR (insn, 0));
}
int
xmalloc (size)
{
register int val = malloc (size);
if (val == 0)
fatal ("virtual memory exhausted");
return val;
}
int
xrealloc (ptr, size)
char *ptr;
int size;
{
int result = realloc (ptr, size);
if (!result)
fatal ("virtual memory exhausted");
return result;
}
void
fatal (s, a1, a2)
char *s;
{
fprintf (stderr, "genflags: ");
fprintf (stderr, s, a1, a2);
fprintf (stderr, "\n");
exit (FATAL_EXIT_CODE);
}
/* More 'friendly' abort that prints the line and file.
config.h can #define abort fancy_abort if you like that sort of thing. */
void
fancy_abort ()
{
fatal ("Internal gcc abort.");
}
int
main (argc, argv)
int argc;
char **argv;
{
rtx desc;
FILE *infile;
extern rtx read_rtx ();
register int c;
obstack_init (rtl_obstack);
if (argc <= 1)
fatal ("No input file name.");
infile = fopen (argv[1], "r");
if (infile == 0)
{
perror (argv[1]);
exit (FATAL_EXIT_CODE);
}
init_rtl ();
printf ("/* Generated automatically by the program `genflags'\n\
from the machine description file `md'. */\n\n");
/* Read the machine description. */
while (1)
{
c = read_skip_spaces (infile);
if (c == EOF)
break;
ungetc (c, infile);
desc = read_rtx (infile);
if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
gen_insn (desc);
}
fflush (stdout);
exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
}