580 lines
13 KiB
C
580 lines
13 KiB
C
/* Generate code from machine description to extract operands from insn as rtl.
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Copyright (C) 1987, 91, 92, 93, 97, 1998 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, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "hconfig.h"
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#ifdef __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include "system.h"
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#include "rtl.h"
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#include "obstack.h"
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#include "insn-config.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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/* Names for patterns. Need to allow linking with print-rtl. */
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char **insn_name_ptr;
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/* This structure contains all the information needed to describe one
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set of extractions methods. Each method may be used by more than
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one pattern if the operands are in the same place.
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The string for each operand describes that path to the operand and
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contains `0' through `9' when going into an expression and `a' through
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`z' when going into a vector. We assume here that only the first operand
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of an rtl expression is a vector. genrecog.c makes the same assumption
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(and uses the same representation) and it is currently true. */
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struct extraction
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{
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int op_count;
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char *oplocs[MAX_RECOG_OPERANDS];
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int dup_count;
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char *duplocs[MAX_DUP_OPERANDS];
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int dupnums[MAX_DUP_OPERANDS];
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struct code_ptr *insns;
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struct extraction *next;
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};
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/* Holds a single insn code that use an extraction method. */
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struct code_ptr
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{
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int insn_code;
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struct code_ptr *next;
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};
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static struct extraction *extractions;
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/* Number instruction patterns handled, starting at 0 for first one. */
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static int insn_code_number;
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/* Records the large operand number in this insn. */
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static int op_count;
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/* Records the location of any operands using the string format described
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above. */
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static char *oplocs[MAX_RECOG_OPERANDS];
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/* Number the occurrences of MATCH_DUP in each instruction,
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starting at 0 for the first occurrence. */
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static int dup_count;
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/* Records the location of any MATCH_DUP operands. */
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static char *duplocs[MAX_DUP_OPERANDS];
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/* Record the operand number of any MATCH_DUPs. */
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static int dupnums[MAX_DUP_OPERANDS];
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/* Record the list of insn_codes for peepholes. */
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static struct code_ptr *peepholes;
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static void gen_insn PROTO ((rtx));
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static void walk_rtx PROTO ((rtx, char *));
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static void print_path PROTO ((char *));
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char *xmalloc PROTO ((unsigned));
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char *xrealloc PROTO ((char *, unsigned));
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static void fatal PVPROTO ((char *, ...)) ATTRIBUTE_PRINTF_1;
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static char *copystr PROTO ((char *));
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static void mybzero ();
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void fancy_abort PROTO ((void));
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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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register int i;
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register struct extraction *p;
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register struct code_ptr *link;
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op_count = 0;
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dup_count = 0;
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/* No operands seen so far in this pattern. */
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mybzero (oplocs, sizeof oplocs);
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/* Walk the insn's pattern, remembering at all times the path
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down to the walking point. */
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if (XVECLEN (insn, 1) == 1)
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walk_rtx (XVECEXP (insn, 1, 0), "");
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else
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for (i = XVECLEN (insn, 1) - 1; i >= 0; i--)
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{
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char *path = (char *) alloca (2);
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path[0] = 'a' + i;
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path[1] = 0;
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walk_rtx (XVECEXP (insn, 1, i), path);
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}
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link = (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
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link->insn_code = insn_code_number;
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/* See if we find something that already had this extraction method. */
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for (p = extractions; p; p = p->next)
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{
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if (p->op_count != op_count || p->dup_count != dup_count)
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continue;
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for (i = 0; i < op_count; i++)
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if (p->oplocs[i] != oplocs[i]
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&& ! (p->oplocs[i] != 0 && oplocs[i] != 0
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&& ! strcmp (p->oplocs[i], oplocs[i])))
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break;
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if (i != op_count)
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continue;
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for (i = 0; i < dup_count; i++)
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if (p->dupnums[i] != dupnums[i]
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|| strcmp (p->duplocs[i], duplocs[i]))
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break;
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if (i != dup_count)
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continue;
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/* This extraction is the same as ours. Just link us in. */
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link->next = p->insns;
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p->insns = link;
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return;
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}
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/* Otherwise, make a new extraction method. */
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p = (struct extraction *) xmalloc (sizeof (struct extraction));
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p->op_count = op_count;
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p->dup_count = dup_count;
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p->next = extractions;
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extractions = p;
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p->insns = link;
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link->next = 0;
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for (i = 0; i < op_count; i++)
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p->oplocs[i] = oplocs[i];
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for (i = 0; i < dup_count; i++)
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p->dupnums[i] = dupnums[i], p->duplocs[i] = duplocs[i];
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}
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static void
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walk_rtx (x, path)
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rtx x;
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char *path;
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{
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register RTX_CODE code;
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register int i;
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register int len;
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register char *fmt;
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int depth = strlen (path);
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char *newpath;
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if (x == 0)
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return;
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code = GET_CODE (x);
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switch (code)
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{
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case PC:
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case CC0:
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case CONST_INT:
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case SYMBOL_REF:
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return;
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case MATCH_OPERAND:
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case MATCH_SCRATCH:
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oplocs[XINT (x, 0)] = copystr (path);
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op_count = MAX (op_count, XINT (x, 0) + 1);
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break;
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case MATCH_DUP:
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case MATCH_PAR_DUP:
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duplocs[dup_count] = copystr (path);
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dupnums[dup_count] = XINT (x, 0);
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dup_count++;
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break;
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case MATCH_OP_DUP:
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duplocs[dup_count] = copystr (path);
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dupnums[dup_count] = XINT (x, 0);
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dup_count++;
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newpath = (char *) alloca (depth + 2);
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strcpy (newpath, path);
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newpath[depth + 1] = 0;
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for (i = XVECLEN (x, 1) - 1; i >= 0; i--)
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{
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newpath[depth] = '0' + i;
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walk_rtx (XVECEXP (x, 1, i), newpath);
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}
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return;
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case MATCH_OPERATOR:
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oplocs[XINT (x, 0)] = copystr (path);
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op_count = MAX (op_count, XINT (x, 0) + 1);
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newpath = (char *) alloca (depth + 2);
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strcpy (newpath, path);
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newpath[depth + 1] = 0;
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for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
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{
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newpath[depth] = '0' + i;
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walk_rtx (XVECEXP (x, 2, i), newpath);
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}
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return;
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case MATCH_PARALLEL:
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oplocs[XINT (x, 0)] = copystr (path);
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op_count = MAX (op_count, XINT (x, 0) + 1);
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newpath = (char *) alloca (depth + 2);
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strcpy (newpath, path);
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newpath[depth + 1] = 0;
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for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
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{
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newpath[depth] = 'a' + i;
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walk_rtx (XVECEXP (x, 2, i), newpath);
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}
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return;
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case ADDRESS:
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walk_rtx (XEXP (x, 0), path);
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return;
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default:
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break;
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}
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newpath = (char *) alloca (depth + 2);
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strcpy (newpath, path);
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newpath[depth + 1] = 0;
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fmt = GET_RTX_FORMAT (code);
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len = GET_RTX_LENGTH (code);
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for (i = 0; i < len; i++)
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{
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if (fmt[i] == 'e' || fmt[i] == 'u')
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{
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newpath[depth] = '0' + i;
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walk_rtx (XEXP (x, i), newpath);
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}
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else if (fmt[i] == 'E')
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{
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int j;
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for (j = XVECLEN (x, i) - 1; j >= 0; j--)
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{
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newpath[depth] = 'a' + j;
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walk_rtx (XVECEXP (x, i, j), newpath);
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}
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}
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}
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}
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/* Given a PATH, representing a path down the instruction's
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pattern from the root to a certain point, output code to
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evaluate to the rtx at that point. */
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static void
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print_path (path)
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char *path;
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{
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register int len = strlen (path);
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register int i;
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if (len == 0)
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{
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/* Don't emit "pat", since we may try to take the address of it,
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which isn't what is intended. */
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printf("PATTERN (insn)");
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return;
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}
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/* We first write out the operations (XEXP or XVECEXP) in reverse
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order, then write "insn", then the indices in forward order. */
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for (i = len - 1; i >=0 ; i--)
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{
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if (path[i] >= 'a' && path[i] <= 'z')
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printf ("XVECEXP (");
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else if (path[i] >= '0' && path[i] <= '9')
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printf ("XEXP (");
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else
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abort ();
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}
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printf ("pat");
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for (i = 0; i < len; i++)
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{
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if (path[i] >= 'a' && path[i] <= 'z')
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printf (", 0, %d)", path[i] - 'a');
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else if (path[i] >= '0' && path[i] <= '9')
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printf (", %d)", path[i] - '0');
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else
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abort ();
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}
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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 VPROTO ((char *format, ...))
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{
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#ifndef __STDC__
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char *format;
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#endif
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va_list ap;
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VA_START (ap, format);
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#ifndef __STDC__
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format = va_arg (ap, char *);
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#endif
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fprintf (stderr, "genextract: ");
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vfprintf (stderr, format, ap);
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va_end (ap);
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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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static char *
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copystr (s1)
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char *s1;
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{
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register char *tem;
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if (s1 == 0)
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return 0;
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tem = (char *) xmalloc (strlen (s1) + 1);
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strcpy (tem, s1);
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return tem;
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}
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static void
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mybzero (b, length)
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register char *b;
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register unsigned length;
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{
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while (length-- > 0)
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*b++ = 0;
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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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register int c, i;
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struct extraction *p;
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struct code_ptr *link;
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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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/* Assign sequential codes to all entries in the machine description
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in parallel with the tables in insn-output.c. */
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insn_code_number = 0;
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printf ("/* Generated automatically by the program `genextract'\n\
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from the machine description file `md'. */\n\n");
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printf ("#include \"config.h\"\n");
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printf ("#include \"system.h\"\n");
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printf ("#include \"rtl.h\"\n\n");
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/* This variable exists only so it can be the "location"
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of any missing operand whose numbers are skipped by a given pattern. */
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printf ("static rtx junk ATTRIBUTE_UNUSED;\n");
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printf ("extern rtx recog_operand[];\n");
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printf ("extern rtx *recog_operand_loc[];\n");
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printf ("extern rtx *recog_dup_loc[];\n");
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printf ("extern char recog_dup_num[];\n");
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printf ("void\ninsn_extract (insn)\n");
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printf (" rtx insn;\n");
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printf ("{\n");
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printf (" register rtx *ro = recog_operand;\n");
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printf (" register rtx **ro_loc = recog_operand_loc;\n");
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printf (" rtx pat = PATTERN (insn);\n");
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printf (" int i ATTRIBUTE_UNUSED;\n\n");
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printf (" switch (INSN_CODE (insn))\n");
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printf (" {\n");
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printf (" case -1:\n");
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printf (" fatal_insn_not_found (insn);\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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{
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gen_insn (desc);
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++insn_code_number;
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}
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else if (GET_CODE (desc) == DEFINE_PEEPHOLE)
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{
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struct code_ptr *link
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= (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
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link->insn_code = insn_code_number;
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link->next = peepholes;
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peepholes = link;
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++insn_code_number;
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}
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else if (GET_CODE (desc) == DEFINE_EXPAND
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|| GET_CODE (desc) == DEFINE_SPLIT)
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++insn_code_number;
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}
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/* Write out code to handle peepholes and the insn_codes that it should
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be called for. */
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if (peepholes)
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{
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for (link = peepholes; link; link = link->next)
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printf (" case %d:\n", link->insn_code);
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/* The vector in the insn says how many operands it has.
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And all it contains are operands. In fact, the vector was
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created just for the sake of this function. */
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printf (" for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n");
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printf (" ro[i] = XVECEXP (pat, 0, i);\n");
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printf (" break;\n\n");
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}
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/* Write out all the ways to extract insn operands. */
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for (p = extractions; p; p = p->next)
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{
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for (link = p->insns; link; link = link->next)
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printf (" case %d:\n", link->insn_code);
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for (i = 0; i < p->op_count; i++)
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{
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if (p->oplocs[i] == 0)
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{
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printf (" ro[%d] = const0_rtx;\n", i);
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printf (" ro_loc[%d] = &junk;\n", i);
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}
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else
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{
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printf (" ro[%d] = *(ro_loc[%d] = &", i, i);
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print_path (p->oplocs[i]);
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printf (");\n");
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}
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}
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for (i = 0; i < p->dup_count; i++)
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{
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printf (" recog_dup_loc[%d] = &", i);
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print_path (p->duplocs[i]);
|
||
printf (";\n");
|
||
printf (" recog_dup_num[%d] = %d;\n", i, p->dupnums[i]);
|
||
}
|
||
|
||
printf (" break;\n\n");
|
||
}
|
||
|
||
/* This should never be reached. Note that we would also reach this abort
|
||
if we tried to extract something whose INSN_CODE was a DEFINE_EXPAND or
|
||
DEFINE_SPLIT, but that is correct. */
|
||
printf (" default:\n abort ();\n");
|
||
|
||
printf (" }\n}\n");
|
||
|
||
fflush (stdout);
|
||
exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
|
||
/* NOTREACHED */
|
||
return 0;
|
||
}
|