349 lines
7.9 KiB
C
349 lines
7.9 KiB
C
/* Generate code from machine description to extract operands from insn as rtl.
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Copyright (C) 1987 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include "config.h"
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#include "rtl.h"
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#include "obstack.h"
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struct obstack obstack;
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struct obstack *rtl_obstack = &obstack;
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#define obstack_chunk_alloc xmalloc
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#define obstack_chunk_free free
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extern int xmalloc ();
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extern void free ();
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/* Number instruction patterns handled, starting at 0 for first one. */
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int insn_code_number;
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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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int dup_count;
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/* While tree-walking an instruction pattern, we keep a chain
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of these `struct link's to record how to get down to the
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current position. In each one, POS is the operand number,
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and if the operand is a vector VEC is the element number.
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VEC is -1 if the operand is not a vector. */
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struct link
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{
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struct link *next;
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int pos;
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int vecelt;
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};
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void walk_rtx ();
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void print_path ();
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void fatal ();
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void fancy_abort ();
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void
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gen_insn (insn)
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rtx insn;
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{
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register int i;
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dup_count = 0;
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/* Output the function name and argument declaration. */
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/* It would be cleaner to make `void' the return type
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but 4.2 vax compiler doesn't accept that in the array
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that these functions are supposed to go in. */
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printf ("VOID\nextract_%d (insn)\n rtx insn;\n", insn_code_number);
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printf ("{\n");
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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), 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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struct link link;
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link.next = 0;
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link.pos = 0;
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link.vecelt = i;
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walk_rtx (XVECEXP (insn, 1, i), &link);
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}
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printf ("}\n\n");
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}
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/* Like gen_insn but handles `define_peephole'. */
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void
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gen_peephole (peep)
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rtx peep;
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{
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/* Output the function name and argument declaration. */
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printf ("VOID\nextract_%d (insn)\n rtx insn;\n", insn_code_number);
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printf ("{\n");
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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 ("\
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bcopy (&XVECEXP (insn, 0, 0), recog_operand,\
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UNITS_PER_WORD * XVECLEN (insn, 0));\n");
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printf ("}\n\n");
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}
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void
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walk_rtx (x, path)
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rtx x;
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struct link *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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struct link link;
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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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printf (" recog_operand[%d] = *(recog_operand_loc[%d]\n = &",
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XINT (x, 0), XINT (x, 0));
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print_path (path);
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printf (");\n");
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break;
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case MATCH_DUP:
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printf (" recog_dup_loc[%d] = &", dup_count);
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print_path (path);
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printf (";\n");
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printf (" recog_dup_num[%d] = %d;\n", dup_count, XINT (x, 0));
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dup_count++;
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break;
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case MATCH_OPERATOR:
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printf (" recog_operand[%d] = *(recog_operand_loc[%d]\n = &",
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XINT (x, 0), XINT (x, 0));
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print_path (path);
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printf (");\n");
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link.next = path;
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link.vecelt = -1;
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for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
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{
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link.pos = i;
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walk_rtx (XVECEXP (x, 2, i), &link);
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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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}
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link.next = path;
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link.vecelt = -1;
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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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link.pos = i;
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if (fmt[i] == 'e' || fmt[i] == 'u')
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{
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walk_rtx (XEXP (x, i), &link);
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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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link.vecelt = j;
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walk_rtx (XVECEXP (x, i, j), &link);
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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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void
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print_path (path)
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struct link *path;
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{
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if (path == 0)
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printf ("insn");
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else if (path->vecelt >= 0)
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{
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printf ("XVECEXP (");
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print_path (path->next);
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printf (", %d, %d)", path->pos, path->vecelt);
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}
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else
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{
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printf ("XEXP (");
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print_path (path->next);
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printf (", %d)", path->pos);
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}
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}
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int
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xmalloc (size)
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{
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register int val = malloc (size);
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if (val == 0)
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fatal ("virtual memory exhausted");
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return val;
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}
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int
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xrealloc (ptr, size)
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char *ptr;
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int size;
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{
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int result = realloc (ptr, size);
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if (!result)
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fatal ("virtual memory exhausted");
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return result;
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}
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void
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fatal (s, a1, a2)
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char *s;
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{
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fprintf (stderr, "genextract: ");
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fprintf (stderr, s, a1, a2);
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fprintf (stderr, "\n");
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exit (FATAL_EXIT_CODE);
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}
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/* More 'friendly' abort that prints the line and file.
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config.h can #define abort fancy_abort if you like that sort of thing. */
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void
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fancy_abort ()
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{
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fatal ("Internal gcc abort.");
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}
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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rtx desc;
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FILE *infile;
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extern rtx read_rtx ();
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register int c, i;
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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 \"rtl.h\"\n\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\n");
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/* The extractor functions really should return `void';
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but old C compilers don't seem to be able to handle the array
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definition if `void' is used. So use `int' in non-ANSI C compilers. */
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printf ("#ifdef __STDC__\n#define VOID void\n#else\n#define VOID int\n#endif\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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if (GET_CODE (desc) == DEFINE_PEEPHOLE)
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{
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gen_peephole (desc);
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++insn_code_number;
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}
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if (GET_CODE (desc) == DEFINE_EXPAND)
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{
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printf ("VOID extract_%d () {}\n\n", insn_code_number);
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++insn_code_number;
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}
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}
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printf ("VOID (*insn_extract_fn[]) () =\n{ ");
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for (i = 0; i < insn_code_number; i++)
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{
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if (i % 4 != 0)
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printf (", ");
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else if (i != 0)
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printf (",\n ");
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printf ("extract_%d", i);
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}
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printf ("\n};\n\n");
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printf ("void fatal_insn_not_found ();\n\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 if (INSN_CODE (insn) == -1) fatal_insn_not_found (insn);\n");
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printf (" (*insn_extract_fn[INSN_CODE (insn)]) (PATTERN (insn));\n}\n");
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fflush (stdout);
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exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
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}
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