blob: 6186d6433d99a77fd0ff22dbf60b6625c17f7748 [file] [log] [blame]
/* Generate from machine description:
- some flags HAVE_... saying which simple standard instructions are
available for this machine.
Copyright (C) 1987-2018 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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 3, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "bconfig.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "obstack.h"
#include "errors.h"
#include "read-md.h"
#include "gensupport.h"
/* Obstack to remember insns with. */
static struct obstack obstack;
/* Max size of names encountered. */
static int max_id_len;
/* Max operand encountered in a scan over some insn. */
static int max_opno;
static void max_operand_1 (rtx);
static int num_operands (rtx);
static void gen_proto (rtx);
/* Count the number of match_operand's found. */
static void
max_operand_1 (rtx x)
{
RTX_CODE code;
int i;
int len;
const char *fmt;
if (x == 0)
return;
code = GET_CODE (x);
if (code == MATCH_OPERAND || code == MATCH_OPERATOR
|| code == MATCH_PARALLEL)
max_opno = MAX (max_opno, XINT (x, 0));
fmt = GET_RTX_FORMAT (code);
len = GET_RTX_LENGTH (code);
for (i = 0; i < len; i++)
{
if (fmt[i] == 'e' || fmt[i] == 'u')
max_operand_1 (XEXP (x, i));
else if (fmt[i] == 'E')
{
int j;
for (j = 0; j < XVECLEN (x, i); j++)
max_operand_1 (XVECEXP (x, i, j));
}
}
}
static int
num_operands (rtx insn)
{
int len = XVECLEN (insn, 1);
int i;
max_opno = -1;
for (i = 0; i < len; i++)
max_operand_1 (XVECEXP (insn, 1, i));
return max_opno + 1;
}
/* Print out prototype information for a generator function. If the
insn pattern has been elided, print out a dummy generator that
does nothing. */
static void
gen_proto (rtx insn)
{
int num = num_operands (insn);
int i;
const char *name = XSTR (insn, 0);
int truth = maybe_eval_c_test (XSTR (insn, 2));
if (truth != 0)
printf ("extern rtx gen_%-*s (", max_id_len, name);
else
printf ("static inline rtx gen_%-*s (", max_id_len, name);
if (num == 0)
fputs ("void", stdout);
else
{
for (i = 1; i < num; i++)
fputs ("rtx, ", stdout);
fputs ("rtx", stdout);
}
puts (");");
/* Some back ends want to take the address of generator functions,
so we cannot simply use #define for these dummy definitions. */
if (truth == 0)
{
printf ("static inline rtx\ngen_%s", name);
if (num > 0)
{
putchar ('(');
for (i = 0; i < num-1; i++)
printf ("rtx ARG_UNUSED (%c), ", 'a' + i);
printf ("rtx ARG_UNUSED (%c))\n", 'a' + i);
}
else
puts ("(void)");
puts ("{\n return 0;\n}");
}
}
static void
gen_insn (md_rtx_info *info)
{
rtx insn = info->def;
const char *name = XSTR (insn, 0);
const char *p;
const char *lt, *gt;
int len;
int truth = maybe_eval_c_test (XSTR (insn, 2));
lt = strchr (name, '<');
if (lt && strchr (lt + 1, '>'))
{
error_at (info->loc, "unresolved iterator");
return;
}
gt = strchr (name, '>');
if (lt || gt)
{
error_at (info->loc, "unmatched angle brackets, likely "
"an error in iterator syntax");
return;
}
/* Don't mention instructions whose names are the null string
or begin with '*'. They are in the machine description just
to be recognized. */
if (name[0] == 0 || name[0] == '*')
return;
len = strlen (name);
if (len > max_id_len)
max_id_len = len;
if (truth == 0)
/* Emit nothing. */;
else if (truth == 1)
printf ("#define HAVE_%s 1\n", name);
else
{
/* Write the macro definition, putting \'s at the end of each line,
if more than one. */
printf ("#define HAVE_%s (", name);
for (p = XSTR (insn, 2); *p; p++)
{
if (IS_VSPACE (*p))
fputs (" \\\n", stdout);
else
putchar (*p);
}
fputs (")\n", stdout);
}
obstack_grow (&obstack, &insn, sizeof (rtx));
}
int
main (int argc, const char **argv)
{
rtx dummy;
rtx *insns;
rtx *insn_ptr;
progname = "genflags";
obstack_init (&obstack);
/* We need to see all the possibilities. Elided insns may have
direct calls to their generators in C code. */
insn_elision = 0;
if (!init_rtx_reader_args (argc, argv))
return (FATAL_EXIT_CODE);
puts ("/* Generated automatically by the program `genflags'");
puts (" from the machine description file `md'. */\n");
puts ("#ifndef GCC_INSN_FLAGS_H");
puts ("#define GCC_INSN_FLAGS_H\n");
/* Read the machine description. */
md_rtx_info info;
while (read_md_rtx (&info))
switch (GET_CODE (info.def))
{
case DEFINE_INSN:
case DEFINE_EXPAND:
gen_insn (&info);
break;
default:
break;
}
/* Print out the prototypes now. */
dummy = (rtx) 0;
obstack_grow (&obstack, &dummy, sizeof (rtx));
insns = XOBFINISH (&obstack, rtx *);
for (insn_ptr = insns; *insn_ptr; insn_ptr++)
gen_proto (*insn_ptr);
puts ("\n#endif /* GCC_INSN_FLAGS_H */");
if (have_error || ferror (stdout) || fflush (stdout) || fclose (stdout))
return FATAL_EXIT_CODE;
return SUCCESS_EXIT_CODE;
}