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genextract.c
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1992-06-08
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/* Generate code from machine description to extract operands from insn as rtl.
Copyright (C) 1987 Free Software Foundation, Inc.
$Id: genextract.c,v 1.2 90/06/04 11:46:11 jeff Exp $
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 ();
/* Number instruction patterns handled, starting at 0 for first one. */
int insn_code_number;
/* Number the occurrences of MATCH_DUP in each instruction,
starting at 0 for the first occurrence. */
int dup_count;
/* While tree-walking an instruction pattern, we keep a chain
of these `struct link's to record how to get down to the
current position. In each one, POS is the operand number,
and if the operand is a vector VEC is the element number.
VEC is -1 if the operand is not a vector. */
struct link
{
struct link *next;
int pos;
int vecelt;
};
void walk_rtx ();
void print_path ();
void fatal ();
void fancy_abort ();
void
gen_insn (insn)
rtx insn;
{
register int i;
dup_count = 0;
/* Output the function name and argument declaration. */
/* It would be cleaner to make `void' the return type
but 4.2 vax compiler doesn't accept that in the array
that these functions are supposed to go in. */
printf ("VOID\nextract_%d (insn)\n rtx insn;\n", insn_code_number);
printf ("{\n");
/* Walk the insn's pattern, remembering at all times the path
down to the walking point. */
if (XVECLEN (insn, 1) == 1)
walk_rtx (XVECEXP (insn, 1, 0), 0);
else
for (i = XVECLEN (insn, 1) - 1; i >= 0; i--)
{
struct link link;
link.next = 0;
link.pos = 0;
link.vecelt = i;
walk_rtx (XVECEXP (insn, 1, i), &link);
}
printf ("}\n\n");
}
/* Like gen_insn but handles `define_peephole'. */
void
gen_peephole (peep)
rtx peep;
{
/* Output the function name and argument declaration. */
printf ("VOID\nextract_%d (insn)\n rtx insn;\n", insn_code_number);
printf ("{\n");
/* The vector in the insn says how many operands it has.
And all it contains are operands. In fact, the vector was
created just for the sake of this function. */
printf ("\
bcopy (&XVECEXP (insn, 0, 0), recog_operand,\
sizeof ( rtx ) * XVECLEN (insn, 0));\n");
printf ("}\n\n");
}
void
walk_rtx (x, path)
rtx x;
struct link *path;
{
register RTX_CODE code;
register int i;
register int len;
register char *fmt;
struct link link;
if (x == 0)
return;
code = GET_CODE (x);
switch (code)
{
case PC:
case CC0:
case CONST_INT:
case SYMBOL_REF:
return;
case MATCH_OPERAND:
printf (" recog_operand[%d] = *(recog_operand_loc[%d]\n = &",
XINT (x, 0), XINT (x, 0));
print_path (path);
printf (");\n");
break;
case MATCH_DUP:
printf (" recog_dup_loc[%d] = &", dup_count);
print_path (path);
printf (";\n");
printf (" recog_dup_num[%d] = %d;\n", dup_count, XINT (x, 0));
dup_count++;
break;
case MATCH_OPERATOR:
printf (" recog_operand[%d] = *(recog_operand_loc[%d]\n = &",
XINT (x, 0), XINT (x, 0));
print_path (path);
printf (");\n");
link.next = path;
link.vecelt = -1;
for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
{
link.pos = i;
walk_rtx (XVECEXP (x, 2, i), &link);
}
return;
case ADDRESS:
walk_rtx (XEXP (x, 0), path);
return;
}
link.next = path;
link.vecelt = -1;
fmt = GET_RTX_FORMAT (code);
len = GET_RTX_LENGTH (code);
for (i = 0; i < len; i++)
{
link.pos = i;
if (fmt[i] == 'e' || fmt[i] == 'u')
{
walk_rtx (XEXP (x, i), &link);
}
else if (fmt[i] == 'E')
{
int j;
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
{
link.vecelt = j;
walk_rtx (XVECEXP (x, i, j), &link);
}
}
}
}
/* Given a PATH, representing a path down the instruction's
pattern from the root to a certain point, output code to
evaluate to the rtx at that point. */
void
print_path (path)
struct link *path;
{
if (path == 0)
printf ("insn");
else if (path->vecelt >= 0)
{
printf ("XVECEXP (");
print_path (path->next);
printf (", %d, %d)", path->pos, path->vecelt);
}
else
{
printf ("XEXP (");
print_path (path->next);
printf (", %d)", path->pos);
}
}
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, "genextract: ");
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, i;
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 ();
/* Assign sequential codes to all entries in the machine description
in parallel with the tables in insn-output.c. */
insn_code_number = 0;
printf ("/* Generated automatically by the program `genextract'\n\
from the machine description file `md'. */\n\n");
printf ("#include \"config.h\"\n");
printf ("#include \"rtl.h\"\n\n");
printf ("extern rtx recog_operand[];\n");
printf ("extern rtx *recog_operand_loc[];\n");
printf ("extern rtx *recog_dup_loc[];\n");
printf ("extern char recog_dup_num[];\n\n");
/* The extractor functions really should return `void';
but old C compilers don't seem to be able to handle the array
definition if `void' is used. So use `int' in non-ANSI C compilers. */
printf ("#ifdef __STDC__\n#define VOID void\n#else\n#define VOID int\n#endif\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);
++insn_code_number;
}
if (GET_CODE (desc) == DEFINE_PEEPHOLE)
{
gen_peephole (desc);
++insn_code_number;
}
if (GET_CODE (desc) == DEFINE_EXPAND)
{
printf ("VOID extract_%d () {}\n\n", insn_code_number);
++insn_code_number;
}
}
printf ("VOID (*insn_extract_fn[]) () =\n{ ");
for (i = 0; i < insn_code_number; i++)
{
if (i % 4 != 0)
printf (", ");
else if (i != 0)
printf (",\n ");
printf ("extract_%d", i);
}
printf ("\n};\n\n");
printf ("void fatal_insn_not_found ();\n\n");
printf ("void\ninsn_extract (insn)\n");
printf (" rtx insn;\n");
printf ("{\n if (INSN_CODE (insn) == -1) fatal_insn_not_found (insn);\n");
printf (" (*insn_extract_fn[INSN_CODE (insn)]) (PATTERN (insn));\n}\n");
fflush (stdout);
exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
}