295 lines
6.6 KiB
C
295 lines
6.6 KiB
C
/* Generate from machine description:
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- some flags HAVE_... saying which simple standard instructions are
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available for this machine.
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Copyright (C) 1987, 1991 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef lint
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static char rcsid[] = "$Id: genflags.c,v 1.1 1993/08/23 09:20:45 cgd Exp $";
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#endif /* not lint */
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#include <stdio.h>
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#include "config.h"
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#include "rtl.h"
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#include "obstack.h"
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static struct obstack obstack;
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struct obstack *rtl_obstack = &obstack;
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#define obstack_chunk_alloc xmalloc
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#define obstack_chunk_free free
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extern void free ();
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extern rtx read_rtx ();
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char *xmalloc ();
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static void fatal ();
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void fancy_abort ();
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/* Names for patterns. Need to allow linking with print-rtl. */
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char **insn_name_ptr;
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/* Obstacks to remember normal, and call insns. */
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static struct obstack call_obstack, normal_obstack;
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/* Max size of names encountered. */
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static int max_id_len;
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/* Count the number of match_operand's found. */
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static int
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num_operands (x)
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rtx x;
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{
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int count = 0;
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int i, j;
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enum rtx_code code = GET_CODE (x);
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char *format_ptr = GET_RTX_FORMAT (code);
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if (code == MATCH_OPERAND)
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return 1;
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if (code == MATCH_OPERATOR || code == MATCH_PARALLEL)
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count++;
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for (i = 0; i < GET_RTX_LENGTH (code); i++)
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{
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switch (*format_ptr++)
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{
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case 'u':
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case 'e':
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count += num_operands (XEXP (x, i));
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break;
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case 'E':
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if (XVEC (x, i) != NULL)
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for (j = 0; j < XVECLEN (x, i); j++)
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count += num_operands (XVECEXP (x, i, j));
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break;
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}
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}
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return count;
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}
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/* Print out prototype information for a function. */
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static void
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gen_proto (insn)
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rtx insn;
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{
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int num = num_operands (insn);
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printf ("extern rtx gen_%-*s PROTO((", max_id_len, XSTR (insn, 0));
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if (num == 0)
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printf ("void");
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else
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{
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while (num-- > 1)
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printf ("rtx, ");
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printf ("rtx");
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}
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printf ("));\n");
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}
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/* Print out a function declaration without a prototype. */
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static void
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gen_nonproto (insn)
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rtx insn;
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{
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printf ("extern rtx gen_%s ();\n", XSTR (insn, 0));
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}
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static void
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gen_insn (insn)
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rtx insn;
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{
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char *name = XSTR (insn, 0);
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char *p;
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struct obstack *obstack_ptr;
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int len;
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/* Don't mention instructions whose names are the null string.
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They are in the machine description just to be recognized. */
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len = strlen (name);
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if (len == 0)
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return;
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if (len > max_id_len)
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max_id_len = len;
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printf ("#define HAVE_%s ", name);
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if (strlen (XSTR (insn, 2)) == 0)
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printf ("1\n");
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else
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{
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/* Write the macro definition, putting \'s at the end of each line,
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if more than one. */
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printf ("(");
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for (p = XSTR (insn, 2); *p; p++)
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{
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if (*p == '\n')
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printf (" \\\n");
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else
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printf ("%c", *p);
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}
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printf (")\n");
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}
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/* Save the current insn, so that we can later put out appropriate
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prototypes. At present, most md files have the wrong number of
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arguments for the call insns (call, call_value, call_pop,
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call_value_pop) ignoring the extra arguments that are passed for
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some machines, so by default, turn off the prototype. */
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obstack_ptr = (name[0] == 'c'
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&& (!strcmp (name, "call")
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|| !strcmp (name, "call_value")
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|| !strcmp (name, "call_pop")
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|| !strcmp (name, "call_value_pop")))
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? &call_obstack : &normal_obstack;
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obstack_grow (obstack_ptr, &insn, sizeof (rtx));
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}
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char *
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xmalloc (size)
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unsigned size;
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{
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register char *val = (char *) malloc (size);
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if (val == 0)
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fatal ("virtual memory exhausted");
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return val;
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}
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char *
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xrealloc (ptr, size)
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char *ptr;
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unsigned size;
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{
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char *result = (char *) realloc (ptr, size);
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if (!result)
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fatal ("virtual memory exhausted");
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return result;
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}
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static void
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fatal (s, a1, a2)
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char *s;
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{
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fprintf (stderr, "genflags: ");
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fprintf (stderr, s, a1, a2);
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fprintf (stderr, "\n");
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exit (FATAL_EXIT_CODE);
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}
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/* More 'friendly' abort that prints the line and file.
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config.h can #define abort fancy_abort if you like that sort of thing. */
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void
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fancy_abort ()
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{
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fatal ("Internal gcc abort.");
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}
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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rtx desc;
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rtx dummy;
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rtx *call_insns;
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rtx *normal_insns;
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rtx *insn_ptr;
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FILE *infile;
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register int c;
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obstack_init (rtl_obstack);
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obstack_init (&call_obstack);
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obstack_init (&normal_obstack);
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if (argc <= 1)
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fatal ("No input file name.");
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infile = fopen (argv[1], "r");
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if (infile == 0)
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{
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perror (argv[1]);
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exit (FATAL_EXIT_CODE);
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}
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init_rtl ();
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printf ("/* Generated automatically by the program `genflags'\n\
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from the machine description file `md'. */\n\n");
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/* Read the machine description. */
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while (1)
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{
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c = read_skip_spaces (infile);
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if (c == EOF)
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break;
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ungetc (c, infile);
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desc = read_rtx (infile);
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if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
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gen_insn (desc);
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}
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/* Print out the prototypes now. */
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dummy = (rtx)0;
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obstack_grow (&call_obstack, &dummy, sizeof (rtx));
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call_insns = (rtx *) obstack_finish (&call_obstack);
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obstack_grow (&normal_obstack, &dummy, sizeof (rtx));
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normal_insns = (rtx *) obstack_finish (&normal_obstack);
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printf ("\n#ifndef NO_MD_PROTOTYPES\n");
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for (insn_ptr = normal_insns; *insn_ptr; insn_ptr++)
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gen_proto (*insn_ptr);
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printf ("\n#ifdef MD_CALL_PROTOTYPES\n");
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for (insn_ptr = call_insns; *insn_ptr; insn_ptr++)
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gen_proto (*insn_ptr);
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printf ("\n#else /* !MD_CALL_PROTOTYPES */\n");
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for (insn_ptr = call_insns; *insn_ptr; insn_ptr++)
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gen_nonproto (*insn_ptr);
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printf ("#endif /* !MD_CALL_PROTOTYPES */\n");
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printf ("\n#else /* NO_MD_PROTOTYPES */\n");
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for (insn_ptr = normal_insns; *insn_ptr; insn_ptr++)
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gen_nonproto (*insn_ptr);
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for (insn_ptr = call_insns; *insn_ptr; insn_ptr++)
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gen_nonproto (*insn_ptr);
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printf ("#endif /* NO_MD_PROTOTYPES */\n");
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fflush (stdout);
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exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
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/* NOTREACHED */
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return 0;
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}
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