492 lines
12 KiB
C
492 lines
12 KiB
C
/* Generate code from machine description to extract operands from insn as rtl.
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Copyright (C) 1987-2013 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 3, 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 COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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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 "read-md.h"
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#include "gensupport.h"
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#include "vec.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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typedef char *locstr;
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struct extraction
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{
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unsigned int op_count;
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unsigned int dup_count;
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locstr *oplocs;
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locstr *duplocs;
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int *dupnums;
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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 uses 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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/* All extractions needed for this machine description. */
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static struct extraction *extractions;
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/* All insn codes for old-style peepholes. */
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static struct code_ptr *peepholes;
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/* This structure is used by gen_insn and walk_rtx to accumulate the
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data that will be used to produce an extractions structure. */
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struct accum_extract
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{
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vec<locstr> oplocs;
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vec<locstr> duplocs;
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vec<int> dupnums;
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vec<char> pathstr;
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};
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int line_no;
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/* Forward declarations. */
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static void walk_rtx (rtx, struct accum_extract *);
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static void
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gen_insn (rtx insn, int insn_code_number)
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{
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int i;
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unsigned int op_count, dup_count, j;
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struct extraction *p;
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struct code_ptr *link;
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struct accum_extract acc;
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acc.oplocs.create (10);
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acc.duplocs.create (10);
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acc.dupnums.create (10);
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acc.pathstr.create (20);
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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), &acc);
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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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acc.pathstr.safe_push ('a' + i);
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walk_rtx (XVECEXP (insn, 1, i), &acc);
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acc.pathstr.pop ();
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}
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link = XNEW (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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op_count = acc.oplocs.length ();
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dup_count = acc.duplocs.length ();
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gcc_assert (dup_count == acc.dupnums.length ());
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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 (j = 0; j < op_count; j++)
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{
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char *a = p->oplocs[j];
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char *b = acc.oplocs[j];
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if (a != b && (!a || !b || strcmp (a, b)))
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break;
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}
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if (j != op_count)
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continue;
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for (j = 0; j < dup_count; j++)
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if (p->dupnums[j] != acc.dupnums[j]
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|| strcmp (p->duplocs[j], acc.duplocs[j]))
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break;
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if (j != 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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goto done;
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}
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/* Otherwise, make a new extraction method. We stash the arrays
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after the extraction structure in memory. */
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p = XNEWVAR (struct extraction, sizeof (struct extraction)
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+ op_count*sizeof (char *)
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+ dup_count*sizeof (char *)
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+ dup_count*sizeof (int));
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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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p->oplocs = (char **)((char *)p + sizeof (struct extraction));
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p->duplocs = p->oplocs + op_count;
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p->dupnums = (int *)(p->duplocs + dup_count);
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memcpy(p->oplocs, acc.oplocs.address(), op_count*sizeof(locstr));
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memcpy(p->duplocs, acc.duplocs.address(), dup_count*sizeof(locstr));
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memcpy(p->dupnums, acc.dupnums.address(), dup_count*sizeof(int));
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done:
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acc.oplocs.release ();
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acc.duplocs.release ();
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acc.dupnums.release ();
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acc.pathstr.release ();
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}
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/* Helper subroutine of walk_rtx: given a vec<locstr>, an index, and a
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string, insert the string at the index, which should either already
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exist and be NULL, or not yet exist within the vector. In the latter
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case the vector is enlarged as appropriate. */
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static void
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VEC_safe_set_locstr (vec<locstr> *vp, unsigned int ix, char *str)
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{
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if (ix < (*vp).length ())
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{
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if ((*vp)[ix])
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{
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message_with_line (line_no, "repeated operand number %d", ix);
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have_error = 1;
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}
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else
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(*vp)[ix] = str;
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}
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else
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{
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while (ix > (*vp).length ())
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vp->safe_push (NULL);
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vp->safe_push (str);
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}
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}
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/* Another helper subroutine of walk_rtx: given a vec<char>, convert it
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to a NUL-terminated string in malloc memory. */
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static char *
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VEC_char_to_string (vec<char> v)
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{
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size_t n = v.length ();
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char *s = XNEWVEC (char, n + 1);
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memcpy (s, v.address (), n);
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s[n] = '\0';
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return s;
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}
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static void
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walk_rtx (rtx x, struct accum_extract *acc)
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{
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RTX_CODE code;
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int i, len, base;
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const char *fmt;
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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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VEC_safe_set_locstr (&acc->oplocs, XINT (x, 0),
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VEC_char_to_string (acc->pathstr));
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break;
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case MATCH_OPERATOR:
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case MATCH_PARALLEL:
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VEC_safe_set_locstr (&acc->oplocs, XINT (x, 0),
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VEC_char_to_string (acc->pathstr));
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base = (code == MATCH_OPERATOR ? '0' : 'a');
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for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
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{
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acc->pathstr.safe_push (base + i);
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walk_rtx (XVECEXP (x, 2, i), acc);
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acc->pathstr.pop ();
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}
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return;
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case MATCH_DUP:
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case MATCH_PAR_DUP:
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case MATCH_OP_DUP:
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acc->duplocs.safe_push (VEC_char_to_string (acc->pathstr));
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acc->dupnums.safe_push (XINT (x, 0));
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if (code == MATCH_DUP)
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break;
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base = (code == MATCH_OP_DUP ? '0' : 'a');
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for (i = XVECLEN (x, 1) - 1; i >= 0; i--)
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{
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acc->pathstr.safe_push (base + i);
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walk_rtx (XVECEXP (x, 1, i), acc);
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acc->pathstr.pop ();
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}
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return;
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default:
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break;
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}
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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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acc->pathstr.safe_push ('0' + i);
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walk_rtx (XEXP (x, i), acc);
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acc->pathstr.pop ();
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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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acc->pathstr.safe_push ('a' + j);
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walk_rtx (XVECEXP (x, i, j), acc);
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acc->pathstr.pop ();
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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 (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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fputs ("PATTERN (insn)", stdout);
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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 "pat", 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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fputs ("XVECEXP (", stdout);
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else if (ISDIGIT (path[i]))
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fputs ("XEXP (", stdout);
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else
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gcc_unreachable ();
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}
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fputs ("pat", stdout);
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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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gcc_unreachable ();
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}
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}
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static void
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print_header (void)
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{
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/* N.B. Code below avoids putting squiggle braces in column 1 inside
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a string, because this confuses some editors' syntax highlighting
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engines. */
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puts ("\
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/* Generated automatically by the program `genextract'\n\
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from the machine description file `md'. */\n\
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\n\
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#include \"config.h\"\n\
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#include \"system.h\"\n\
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#include \"coretypes.h\"\n\
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#include \"tm.h\"\n\
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#include \"rtl.h\"\n\
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#include \"insn-config.h\"\n\
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#include \"recog.h\"\n\
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#include \"diagnostic-core.h\"\n\
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\n\
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/* This variable is used as the \"location\" of any missing operand\n\
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whose numbers are skipped by a given pattern. */\n\
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static rtx junk ATTRIBUTE_UNUSED;\n");
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puts ("\
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void\n\
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insn_extract (rtx insn)\n{\n\
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rtx *ro = recog_data.operand;\n\
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rtx **ro_loc = recog_data.operand_loc;\n\
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rtx pat = PATTERN (insn);\n\
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int i ATTRIBUTE_UNUSED; /* only for peepholes */\n\
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\n\
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#ifdef ENABLE_CHECKING\n\
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memset (ro, 0xab, sizeof (*ro) * MAX_RECOG_OPERANDS);\n\
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memset (ro_loc, 0xab, sizeof (*ro_loc) * MAX_RECOG_OPERANDS);\n\
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#endif\n");
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puts ("\
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switch (INSN_CODE (insn))\n\
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{\n\
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default:\n\
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/* Control reaches here if insn_extract has been called with an\n\
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unrecognizable insn (code -1), or an insn whose INSN_CODE\n\
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corresponds to a DEFINE_EXPAND in the machine description;\n\
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either way, a bug. */\n\
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if (INSN_CODE (insn) < 0)\n\
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fatal_insn (\"unrecognizable insn:\", insn);\n\
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else\n\
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fatal_insn (\"insn with invalid code number:\", insn);\n");
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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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unsigned 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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int insn_code_number;
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progname = "genextract";
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if (!init_rtx_reader_args (argc, argv))
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return (FATAL_EXIT_CODE);
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/* Read the machine description. */
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while ((desc = read_md_rtx (&line_no, &insn_code_number)) != NULL)
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{
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if (GET_CODE (desc) == DEFINE_INSN)
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gen_insn (desc, insn_code_number);
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else if (GET_CODE (desc) == DEFINE_PEEPHOLE)
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{
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struct code_ptr *link = XNEW (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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if (have_error)
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return FATAL_EXIT_CODE;
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print_header ();
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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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puts (" for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n"
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" ro[i] = *(ro_loc[i] = &XVECEXP (pat, 0, i));\n"
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" break;\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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puts (");");
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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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puts (";");
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printf (" recog_data.dup_num[%d] = %d;\n", i, p->dupnums[i]);
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}
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puts (" break;\n");
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}
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puts (" }\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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