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tumbledemerald-legacy/agbcc/gcc/genconfig.c

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import from github
2022-05-19 19:14:13 +02:00
/* Generate from machine description:
- some #define configuration flags.
Copyright (C) 1987, 1991, 1997, 1998, 1999 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, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "rtl.h"
#include "obstack.h"
static struct obstack obstack;
struct obstack *rtl_obstack = &obstack;
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
/* Define this so we can link with print-rtl.o to get debug_rtx function. */
char **insn_name_ptr = 0;
/* flags to determine output of machine description dependent #define's. */
static int max_recog_operands; /* Largest operand number seen. */
static int max_dup_operands; /* Largest number of match_dup in any insn. */
static int max_clobbers_per_insn;
static int register_constraint_flag;
static int have_cc0_flag;
static int have_cmove_flag;
/* CYGNUS LOCAL -- conditional execution/meissner */
static int have_cexecute_true_flag;
static int have_cexecute_false_flag;
/* END CYGNUS LOCAL -- conditional execution/meissner */
static int have_lo_sum_flag;
/* Maximum number of insns seen in a split. */
static int max_insns_per_split = 1;
static int clobbers_seen_this_insn;
static int dup_operands_seen_this_insn;
static void fatal (const char *, ...)
ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
void fancy_abort (void) ATTRIBUTE_NORETURN;
static void walk_insn_part (rtx, int, int);
static void gen_insn (rtx);
static void gen_expand (rtx);
static void gen_split (rtx);
static void gen_peephole (rtx);
/* RECOG_P will be non-zero if this pattern was seen in a context where it will
be used to recognize, rather than just generate an insn.
NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
of a SET whose destination is not (pc). */
static void
walk_insn_part (part, recog_p, non_pc_set_src)
rtx part;
int recog_p;
int non_pc_set_src;
{
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)
max_recog_operands = XINT (part, 0);
if (XSTR (part, 2) && *XSTR (part, 2))
register_constraint_flag = 1;
return;
case MATCH_OP_DUP:
case MATCH_PAR_DUP:
++dup_operands_seen_this_insn;
case MATCH_SCRATCH:
case MATCH_PARALLEL:
case MATCH_OPERATOR:
if (XINT (part, 0) > max_recog_operands)
max_recog_operands = XINT (part, 0);
/* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
MATCH_PARALLEL. */
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)
max_recog_operands = XINT (part, 0);
return;
case CC0:
if (recog_p)
have_cc0_flag = 1;
return;
case LO_SUM:
if (recog_p)
have_lo_sum_flag = 1;
return;
case SET:
walk_insn_part (SET_DEST (part), 0, recog_p);
walk_insn_part (SET_SRC (part), recog_p,
GET_CODE (SET_DEST (part)) != PC);
return;
case IF_THEN_ELSE:
/* Only consider this machine as having a conditional move if the
two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise,
we have some specific IF_THEN_ELSE construct (like the doz
instruction on the RS/6000) that can't be used in the general
context we want it for. */
if (recog_p && non_pc_set_src
&& GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
&& GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
have_cmove_flag = 1;
/* CYGNUS LOCAL -- conditional execution/meissner */
/* Check for conditional execution */
if (recog_p)
{
if ((GET_CODE (XEXP (part, 1)) == SET
|| GET_CODE (XEXP (part, 1)) == MATCH_OPERATOR
|| GET_CODE (XEXP (part, 1)) == PARALLEL)
&& GET_CODE (XEXP (part, 2)) == CONST_INT
&& INTVAL (XEXP (part, 2)) == 0)
have_cexecute_true_flag = 1;
if ((GET_CODE (XEXP (part, 2)) == SET
|| GET_CODE (XEXP (part, 2)) == MATCH_OPERATOR
|| GET_CODE (XEXP (part, 2)) == PARALLEL)
&& GET_CODE (XEXP (part, 1)) == CONST_INT
&& INTVAL (XEXP (part, 1)) == 0)
have_cexecute_false_flag = 1;
}
/* END CYGNUS LOCAL -- conditional execution/meissner */
break;
case REG: case CONST_INT: case SYMBOL_REF:
case PC:
return;
default:
break;
}
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), recog_p, non_pc_set_src);
break;
case 'E':
if (XVEC (part, i) != NULL)
for (j = 0; j < XVECLEN (part, i); j++)
walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
break;
}
}
static 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), 1, 0);
if (clobbers_seen_this_insn > max_clobbers_per_insn)
max_clobbers_per_insn = clobbers_seen_this_insn;
if (dup_operands_seen_this_insn > max_dup_operands)
max_dup_operands = dup_operands_seen_this_insn;
}
/* Similar but scan a define_expand. */
static 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), 0, 0);
if (clobbers_seen_this_insn > max_clobbers_per_insn)
max_clobbers_per_insn = clobbers_seen_this_insn;
}
}
/* Similar but scan a define_split. */
static void
gen_split (split)
rtx split;
{
int i;
/* Look through the patterns that are matched
to compute the maximum operand number. */
for (i = 0; i < XVECLEN (split, 0); i++)
walk_insn_part (XVECEXP (split, 0, i), 1, 0);
/* Look at the number of insns this insn could split into. */
if (XVECLEN (split, 2) > max_insns_per_split)
max_insns_per_split = XVECLEN (split, 2);
}
static 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), 1, 0);
}
void *
xmalloc (size)
size_t size;
{
register void *val = malloc (size);
if (val == 0)
fatal ("virtual memory exhausted");
return val;
}
void *
xrealloc (old, size)
void *old;
size_t size;
{
register void *ptr;
if (old)
ptr = realloc (old, size);
else
ptr = malloc (size);
if (!ptr)
fatal ("virtual memory exhausted");
return ptr;
}
static void
fatal (const char *format, ...)
{
va_list ap;
va_start (ap, format);
fprintf (stderr, "genconfig: ");
vfprintf (stderr, format, ap);
va_end (ap);
fprintf (stderr, "\n");
exit (EXIT_FAILURE);
}
/* 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;
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 (EXIT_FAILURE);
}
init_rtl ();
printf ("/* Generated automatically by the program `genconfig'\n\
from the machine description file `md'. */\n\n");
/* Allow at least 10 operands for the sake of asm constructs. */
max_recog_operands = 9; /* We will add 1 later. */
max_dup_operands = 1;
/* 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_SPLIT)
gen_split (desc);
if (GET_CODE (desc) == DEFINE_PEEPHOLE)
gen_peephole (desc);
}
printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
/* This is conditionally defined, in case the user writes code which emits
more splits than we can readily see (and knows s/he does it). */
printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
max_insns_per_split);
if (register_constraint_flag)
printf ("#define REGISTER_CONSTRAINTS\n");
if (have_cc0_flag)
printf ("#define HAVE_cc0\n");
if (have_cmove_flag)
printf ("#define HAVE_conditional_move\n");
/* CYGNUS LOCAL -- conditional execution/meissner */
if (have_cexecute_true_flag && have_cexecute_false_flag)
printf ("#define HAVE_conditional_execution\n");
/* END CYGNUS LOCAL -- conditional execution/meissner */
if (have_lo_sum_flag)
printf ("#define HAVE_lo_sum\n");
fflush (stdout);
exit (ferror (stdout) != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
/* NOTREACHED */
return 0;
}
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