532 lines
13 KiB
C
532 lines
13 KiB
C
/* Generate code from machine description to extract operands from insn as rtl.
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Copyright (C) 1987, 1991, 1992, 1993, 1997, 1998, 1999, 2000, 2003
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Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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 GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "bconfig.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "rtl.h"
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#include "errors.h"
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#include "insn-config.h"
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#include "gensupport.h"
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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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/* Holds an array of names indexed by insn_code_number. */
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static char **insn_name_ptr = 0;
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static int insn_name_ptr_size = 0;
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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 (rtx);
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static void walk_rtx (rtx, const char *);
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static void print_path (const char *);
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static void record_insn_name (int, const char *);
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static void
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gen_insn (rtx insn)
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{
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int i;
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struct extraction *p;
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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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memset (oplocs, 0, 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[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 = 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 = 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 (rtx x, const char *path)
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{
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RTX_CODE code;
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int i;
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int len;
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const 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)] = xstrdup (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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duplocs[dup_count] = xstrdup (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_PAR_DUP:
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case MATCH_OP_DUP:
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duplocs[dup_count] = xstrdup (path);
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dupnums[dup_count] = XINT (x, 0);
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dup_count++;
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newpath = xmalloc (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] = (code == MATCH_OP_DUP ? '0' : 'a') + i;
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walk_rtx (XVECEXP (x, 1, i), newpath);
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}
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free (newpath);
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return;
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case MATCH_OPERATOR:
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oplocs[XINT (x, 0)] = xstrdup (path);
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op_count = MAX (op_count, XINT (x, 0) + 1);
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newpath = xmalloc (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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free (newpath);
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return;
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case MATCH_PARALLEL:
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oplocs[XINT (x, 0)] = xstrdup (path);
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op_count = MAX (op_count, XINT (x, 0) + 1);
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newpath = xmalloc (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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free (newpath);
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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 = xmalloc (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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free (newpath);
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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 (const char *path)
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{
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int len = strlen (path);
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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 (ISLOWER(path[i]))
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printf ("XVECEXP (");
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else if (ISDIGIT(path[i]))
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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 (ISLOWER(path[i]))
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printf (", 0, %d)", path[i] - 'a');
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else if (ISDIGIT(path[i]))
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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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int
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main (int argc, char **argv)
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{
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rtx desc;
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int i;
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struct extraction *p;
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struct code_ptr *link;
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const char *name;
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progname = "genextract";
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if (argc <= 1)
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fatal ("no input file name");
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if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
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return (FATAL_EXIT_CODE);
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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 \"coretypes.h\"\n");
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printf ("#include \"tm.h\"\n");
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printf ("#include \"rtl.h\"\n");
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printf ("#include \"insn-config.h\"\n");
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printf ("#include \"recog.h\"\n");
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printf ("#include \"toplev.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 ("void\ninsn_extract (rtx insn)\n");
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printf ("{\n");
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printf (" rtx *ro = recog_data.operand;\n");
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printf (" rtx **ro_loc = recog_data.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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#ifdef ENABLE_CHECKING
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printf (" memset (ro, 0xab, sizeof (*ro) * MAX_RECOG_OPERANDS);\n");
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printf (" memset (ro_loc, 0xab, sizeof (*ro_loc) * MAX_RECOG_OPERANDS);\n");
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#endif
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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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int line_no;
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desc = read_md_rtx (&line_no, &insn_code_number);
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if (desc == NULL)
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break;
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if (GET_CODE (desc) == DEFINE_INSN)
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{
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record_insn_name (insn_code_number, XSTR (desc, 0));
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gen_insn (desc);
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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 = 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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}
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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. We need to set the
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location of the operands for sake of simplifications after
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extraction, like eliminating subregs. */
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printf (" for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n");
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printf (" ro[i] = *(ro_loc[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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{
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i = link->insn_code;
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name = get_insn_name (i);
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if (name)
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printf (" case %d: /* %s */\n", i, name);
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else
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printf (" case %d:\n", i);
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}
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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_data.dup_loc[%d] = &", i);
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print_path (p->duplocs[i]);
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printf (";\n");
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printf (" recog_data.dup_num[%d] = %d;\n", i, p->dupnums[i]);
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}
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printf (" break;\n\n");
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}
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/* This should never be reached. Note that we would also reach this abort
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if we tried to extract something whose INSN_CODE was a DEFINE_EXPAND or
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DEFINE_SPLIT, but that is correct. */
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printf (" default:\n abort ();\n");
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printf (" }\n}\n");
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fflush (stdout);
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return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
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}
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/* Define this so we can link with print-rtl.o to get debug_rtx function. */
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const char *
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get_insn_name (int code ATTRIBUTE_UNUSED)
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{
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if (code < insn_name_ptr_size)
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return insn_name_ptr[code];
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else
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return NULL;
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}
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static void
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record_insn_name (int code, const char *name)
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{
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static const char *last_real_name = "insn";
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static int last_real_code = 0;
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char *new;
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if (insn_name_ptr_size <= code)
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{
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int new_size;
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new_size = (insn_name_ptr_size ? insn_name_ptr_size * 2 : 512);
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insn_name_ptr = xrealloc (insn_name_ptr, sizeof(char *) * new_size);
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memset (insn_name_ptr + insn_name_ptr_size, 0,
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sizeof(char *) * (new_size - insn_name_ptr_size));
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insn_name_ptr_size = new_size;
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}
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if (!name || name[0] == '\0')
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{
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new = xmalloc (strlen (last_real_name) + 10);
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sprintf (new, "%s+%d", last_real_name, code - last_real_code);
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}
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else
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{
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last_real_name = new = xstrdup (name);
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last_real_code = code;
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}
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insn_name_ptr[code] = new;
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}
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