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357 lines
8.7 KiB
C
357 lines
8.7 KiB
C
/* Generate from machine description:
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- some #define configuration flags.
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Copyright (C) 1987, 1991 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 <stdio.h>
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#include "hconfig.h"
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#include "rtl.h"
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#include "obstack.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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extern void free ();
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extern rtx read_rtx ();
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/* flags to determine output of machine description dependent #define's. */
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static int max_recog_operands; /* Largest operand number seen. */
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static int max_dup_operands; /* Largest number of match_dup in any insn. */
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static int max_clobbers_per_insn;
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static int register_constraint_flag;
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static int have_cc0_flag;
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static int have_cmove_flag;
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static int have_lo_sum_flag;
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/* Maximum number of insns seen in a split. */
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static int max_insns_per_split = 1;
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static int clobbers_seen_this_insn;
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static int dup_operands_seen_this_insn;
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char *xmalloc ();
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static void fatal ();
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void fancy_abort ();
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/* RECOG_P will be non-zero if this pattern was seen in a context where it will
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be used to recognize, rather than just generate an insn.
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NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
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of a SET whose destination is not (pc). */
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static void
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walk_insn_part (part, recog_p, non_pc_set_src)
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rtx part;
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int recog_p;
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int non_pc_set_src;
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{
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register int i, j;
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register RTX_CODE code;
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register char *format_ptr;
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if (part == 0)
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return;
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code = GET_CODE (part);
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switch (code)
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{
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case CLOBBER:
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clobbers_seen_this_insn++;
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break;
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case MATCH_OPERAND:
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if (XINT (part, 0) > max_recog_operands)
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max_recog_operands = XINT (part, 0);
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if (XSTR (part, 2) && *XSTR (part, 2))
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register_constraint_flag = 1;
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return;
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case MATCH_OP_DUP:
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case MATCH_PAR_DUP:
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++dup_operands_seen_this_insn;
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case MATCH_SCRATCH:
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case MATCH_PARALLEL:
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case MATCH_OPERATOR:
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if (XINT (part, 0) > max_recog_operands)
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max_recog_operands = XINT (part, 0);
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/* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
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MATCH_PARALLEL. */
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break;
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case LABEL_REF:
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if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
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break;
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return;
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case MATCH_DUP:
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++dup_operands_seen_this_insn;
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if (XINT (part, 0) > max_recog_operands)
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max_recog_operands = XINT (part, 0);
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return;
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case CC0:
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if (recog_p)
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have_cc0_flag = 1;
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return;
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case LO_SUM:
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if (recog_p)
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have_lo_sum_flag = 1;
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return;
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case SET:
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walk_insn_part (SET_DEST (part), 0, recog_p);
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walk_insn_part (SET_SRC (part), recog_p,
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GET_CODE (SET_DEST (part)) != PC);
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return;
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case IF_THEN_ELSE:
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/* Only consider this machine as having a conditional move if the
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two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise,
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we have some specific IF_THEN_ELSE construct (like the doz
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instruction on the RS/6000) that can't be used in the general
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context we want it for. */
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if (recog_p && non_pc_set_src
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&& GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
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&& GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
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have_cmove_flag = 1;
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break;
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case REG: case CONST_INT: case SYMBOL_REF:
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case PC:
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return;
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}
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format_ptr = GET_RTX_FORMAT (GET_CODE (part));
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for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
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switch (*format_ptr++)
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{
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case 'e':
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case 'u':
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walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
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break;
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case 'E':
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if (XVEC (part, i) != NULL)
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for (j = 0; j < XVECLEN (part, i); j++)
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walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
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break;
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}
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}
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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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int i;
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/* Walk the insn pattern to gather the #define's status. */
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clobbers_seen_this_insn = 0;
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dup_operands_seen_this_insn = 0;
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if (XVEC (insn, 1) != 0)
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for (i = 0; i < XVECLEN (insn, 1); i++)
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walk_insn_part (XVECEXP (insn, 1, i), 1, 0);
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if (clobbers_seen_this_insn > max_clobbers_per_insn)
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max_clobbers_per_insn = clobbers_seen_this_insn;
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if (dup_operands_seen_this_insn > max_dup_operands)
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max_dup_operands = dup_operands_seen_this_insn;
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}
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/* Similar but scan a define_expand. */
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static void
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gen_expand (insn)
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rtx insn;
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{
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int i;
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/* Walk the insn pattern to gather the #define's status. */
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/* Note that we don't bother recording the number of MATCH_DUPs
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that occur in a gen_expand, because only reload cares about that. */
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if (XVEC (insn, 1) != 0)
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for (i = 0; i < XVECLEN (insn, 1); i++)
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{
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/* Compute the maximum SETs and CLOBBERS
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in any one of the sub-insns;
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don't sum across all of them. */
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clobbers_seen_this_insn = 0;
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walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
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if (clobbers_seen_this_insn > max_clobbers_per_insn)
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max_clobbers_per_insn = clobbers_seen_this_insn;
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}
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}
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/* Similar but scan a define_split. */
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static void
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gen_split (split)
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rtx split;
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{
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int i;
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/* Look through the patterns that are matched
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to compute the maximum operand number. */
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for (i = 0; i < XVECLEN (split, 0); i++)
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walk_insn_part (XVECEXP (split, 0, i), 1, 0);
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/* Look at the number of insns this insn could split into. */
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if (XVECLEN (split, 2) > max_insns_per_split)
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max_insns_per_split = XVECLEN (split, 2);
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}
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static void
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gen_peephole (peep)
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rtx peep;
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{
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int i;
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/* Look through the patterns that are matched
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to compute the maximum operand number. */
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for (i = 0; i < XVECLEN (peep, 0); i++)
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walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
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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 (s, a1, a2)
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char *s;
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{
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fprintf (stderr, "genconfig: ");
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fprintf (stderr, s, a1, a2);
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fprintf (stderr, "\n");
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exit (FATAL_EXIT_CODE);
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}
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/* More 'friendly' abort that prints the line and file.
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config.h can #define abort fancy_abort if you like that sort of thing. */
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void
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fancy_abort ()
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{
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fatal ("Internal gcc abort.");
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}
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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rtx desc;
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FILE *infile;
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register int c;
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obstack_init (rtl_obstack);
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if (argc <= 1)
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fatal ("No input file name.");
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infile = fopen (argv[1], "r");
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if (infile == 0)
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{
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perror (argv[1]);
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exit (FATAL_EXIT_CODE);
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}
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init_rtl ();
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printf ("/* Generated automatically by the program `genconfig'\n\
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from the machine description file `md'. */\n\n");
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/* Allow at least 10 operands for the sake of asm constructs. */
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max_recog_operands = 9; /* We will add 1 later. */
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max_dup_operands = 1;
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/* Read the machine description. */
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while (1)
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{
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c = read_skip_spaces (infile);
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if (c == EOF)
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break;
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ungetc (c, infile);
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desc = read_rtx (infile);
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if (GET_CODE (desc) == DEFINE_INSN)
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gen_insn (desc);
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if (GET_CODE (desc) == DEFINE_EXPAND)
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gen_expand (desc);
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if (GET_CODE (desc) == DEFINE_SPLIT)
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gen_split (desc);
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if (GET_CODE (desc) == DEFINE_PEEPHOLE)
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gen_peephole (desc);
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}
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printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
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printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
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/* This is conditionally defined, in case the user writes code which emits
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more splits than we can readily see (and knows s/he does it). */
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printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
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max_insns_per_split);
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if (register_constraint_flag)
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printf ("#define REGISTER_CONSTRAINTS\n");
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if (have_cc0_flag)
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printf ("#define HAVE_cc0\n");
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if (have_cmove_flag)
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printf ("#define HAVE_conditional_move\n");
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if (have_lo_sum_flag)
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printf ("#define HAVE_lo_sum\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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/* NOTREACHED */
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return 0;
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}
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