268 lines
6.0 KiB
C
268 lines
6.0 KiB
C
/* Generate from machine description:
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- some #define configuration flags.
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Copyright (C) 1987 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 1, 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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#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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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 int xmalloc ();
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extern void free ();
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/* flags to determine output of machine description dependent #define's. */
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int max_recog_operands_flag;
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int max_dup_operands_flag;
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int max_clobbers_per_insn_flag;
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int register_constraint_flag;
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int clobbers_seen_this_insn;
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int dup_operands_seen_this_insn;
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void fatal ();
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void fancy_abort ();
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void
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walk_insn_part (part)
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rtx part;
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{
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register int i, j;
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register RTX_CODE code;
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register char *format_ptr;
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if (part == 0)
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return;
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code = GET_CODE (part);
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switch (code)
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{
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case CLOBBER:
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clobbers_seen_this_insn++;
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break;
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case MATCH_OPERAND:
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if (XINT (part, 0) > max_recog_operands_flag)
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max_recog_operands_flag = XINT (part, 0);
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if (XSTR (part, 2) && *XSTR (part, 2))
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register_constraint_flag = 1;
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return;
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case MATCH_OPERATOR:
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if (XINT (part, 0) > max_recog_operands_flag)
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max_recog_operands_flag = XINT (part, 0);
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/* Now scan the rtl'x in the vector inside the match_operator. */
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break;
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case LABEL_REF:
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if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
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break;
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return;
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case MATCH_DUP:
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++dup_operands_seen_this_insn;
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if (XINT (part, 0) > max_recog_operands_flag)
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max_recog_operands_flag = XINT (part, 0);
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case REG: case CONST_INT: case SYMBOL_REF:
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case PC: case CC0:
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return;
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}
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format_ptr = GET_RTX_FORMAT (GET_CODE (part));
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for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
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switch (*format_ptr++)
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{
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case 'e':
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case 'u':
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walk_insn_part (XEXP (part, i));
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break;
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case 'E':
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if (XVEC (part, i) != NULL)
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for (j = 0; j < XVECLEN (part, i); j++)
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walk_insn_part (XVECEXP (part, i, j));
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break;
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}
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}
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void
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gen_insn (insn)
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rtx insn;
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{
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int i;
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/* Walk the insn pattern to gather the #define's status. */
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clobbers_seen_this_insn = 0;
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dup_operands_seen_this_insn = 0;
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if (XVEC (insn, 1) != 0)
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for (i = 0; i < XVECLEN (insn, 1); i++)
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walk_insn_part (XVECEXP (insn, 1, i));
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if (clobbers_seen_this_insn > max_clobbers_per_insn_flag)
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max_clobbers_per_insn_flag = clobbers_seen_this_insn;
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if (dup_operands_seen_this_insn > max_dup_operands_flag)
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max_dup_operands_flag = dup_operands_seen_this_insn;
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}
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/* Similar but scan a define_expand. */
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void
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gen_expand (insn)
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rtx insn;
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{
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int i;
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/* Walk the insn pattern to gather the #define's status. */
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/* Note that we don't bother recording the number of MATCH_DUPs
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that occur in a gen_expand, because only reload cares about that. */
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if (XVEC (insn, 1) != 0)
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for (i = 0; i < XVECLEN (insn, 1); i++)
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{
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/* Compute the maximum SETs and CLOBBERS
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in any one of the sub-insns;
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don't sum across all of them. */
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clobbers_seen_this_insn = 0;
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walk_insn_part (XVECEXP (insn, 1, i));
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if (clobbers_seen_this_insn > max_clobbers_per_insn_flag)
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max_clobbers_per_insn_flag = clobbers_seen_this_insn;
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}
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}
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void
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gen_peephole (peep)
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rtx peep;
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{
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int i;
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/* Look through the patterns that are matched
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to compute the maximum operand number. */
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for (i = 0; i < XVECLEN (peep, 0); i++)
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walk_insn_part (XVECEXP (peep, 0, i));
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}
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int
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xmalloc (size)
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{
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register int val = 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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int
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xrealloc (ptr, size)
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char *ptr;
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int size;
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{
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int result = 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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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, "genconfig: ");
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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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FILE *infile;
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extern rtx read_rtx ();
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register int c;
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obstack_init (rtl_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 `genconfig'\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)
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gen_insn (desc);
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if (GET_CODE (desc) == DEFINE_EXPAND)
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gen_expand (desc);
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if (GET_CODE (desc) == DEFINE_PEEPHOLE)
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gen_peephole (desc);
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}
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/* 3 more than needed for this md file, for the sake of asm constructs. */
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printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands_flag + 4);
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if (max_dup_operands_flag == 0)
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max_dup_operands_flag = 1;
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printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands_flag);
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if (register_constraint_flag)
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printf ("#define REGISTER_CONSTRAINTS\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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}
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