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/* Generate from machine description:
- some #define configuration flags.
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 1, 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 ();
/* flags to determine output of machine description dependent #define's. */
int max_recog_operands_flag;
int max_dup_operands_flag;
int max_clobbers_per_insn_flag;
int register_constraint_flag;
int clobbers_seen_this_insn;
int dup_operands_seen_this_insn;
void fatal ();
void fancy_abort ();
void
walk_insn_part (part)
rtx part;
{
register int i, j;
register RTX_CODE code;
register char *format_ptr;
if (part == 0)
return;
code = GET_CODE (part);
switch (code)
{
case CLOBBER:
clobbers_seen_this_insn++;
break;
case MATCH_OPERAND:
if (XINT (part, 0) > max_recog_operands_flag)
max_recog_operands_flag = XINT (part, 0);
if (XSTR (part, 2) && *XSTR (part, 2))
register_constraint_flag = 1;
return;
case MATCH_OPERATOR:
if (XINT (part, 0) > max_recog_operands_flag)
max_recog_operands_flag = XINT (part, 0);
/* Now scan the rtl'x in the vector inside the match_operator. */
break;
case LABEL_REF:
if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
break;
return;
case MATCH_DUP:
++dup_operands_seen_this_insn;
if (XINT (part, 0) > max_recog_operands_flag)
max_recog_operands_flag = XINT (part, 0);
case REG: case CONST_INT: case SYMBOL_REF:
case PC: case CC0:
return;
}
format_ptr = GET_RTX_FORMAT (GET_CODE (part));
for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
switch (*format_ptr++)
{
case 'e':
case 'u':
walk_insn_part (XEXP (part, i));
break;
case 'E':
if (XVEC (part, i) != NULL)
for (j = 0; j < XVECLEN (part, i); j++)
walk_insn_part (XVECEXP (part, i, j));
break;
}
}
void
gen_insn (insn)
rtx insn;
{
int i;
/* Walk the insn pattern to gather the #define's status. */
clobbers_seen_this_insn = 0;
dup_operands_seen_this_insn = 0;
if (XVEC (insn, 1) != 0)
for (i = 0; i < XVECLEN (insn, 1); i++)
walk_insn_part (XVECEXP (insn, 1, i));
if (clobbers_seen_this_insn > max_clobbers_per_insn_flag)
max_clobbers_per_insn_flag = clobbers_seen_this_insn;
if (dup_operands_seen_this_insn > max_dup_operands_flag)
max_dup_operands_flag = dup_operands_seen_this_insn;
}
/* Similar but scan a define_expand. */
void
gen_expand (insn)
rtx insn;
{
int i;
/* Walk the insn pattern to gather the #define's status. */
/* Note that we don't bother recording the number of MATCH_DUPs
that occur in a gen_expand, because only reload cares about that. */
if (XVEC (insn, 1) != 0)
for (i = 0; i < XVECLEN (insn, 1); i++)
{
/* Compute the maximum SETs and CLOBBERS
in any one of the sub-insns;
don't sum across all of them. */
clobbers_seen_this_insn = 0;
walk_insn_part (XVECEXP (insn, 1, i));
if (clobbers_seen_this_insn > max_clobbers_per_insn_flag)
max_clobbers_per_insn_flag = clobbers_seen_this_insn;
}
}
void
gen_peephole (peep)
rtx peep;
{
int i;
/* Look through the patterns that are matched
to compute the maximum operand number. */
for (i = 0; i < XVECLEN (peep, 0); i++)
walk_insn_part (XVECEXP (peep, 0, i));
}
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, "genconfig: ");
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 `genconfig'\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)
gen_insn (desc);
if (GET_CODE (desc) == DEFINE_EXPAND)
gen_expand (desc);
if (GET_CODE (desc) == DEFINE_PEEPHOLE)
gen_peephole (desc);
}
/* 3 more than needed for this md file, for the sake of asm constructs. */
printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands_flag + 4);
if (max_dup_operands_flag == 0)
max_dup_operands_flag = 1;
printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands_flag);
if (register_constraint_flag)
printf ("#define REGISTER_CONSTRAINTS\n");
fflush (stdout);
exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.