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/* Generate from machine description:

   - some #define configuration flags.

   Copyright (C) 1987, 1991, 1997, 1998, 1999, 2000, 2003, 2004, 2007, 2010

   Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free

Software Foundation; either version 3, or (at your option) any later

version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY

WARRANTY; without even the implied warranty of MERCHANTABILITY or

FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#include "bconfig.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "rtl.h"

#include "errors.h"

#include "gensupport.h"

/* flags to determine output of machine description dependent #define's.  */

static int max_recog_operands;  /* Largest operand number seen.  */

static int max_dup_operands;    /* Largest number of match_dup in any insn.  */

static int max_clobbers_per_insn;

static int have_cc0_flag;

static int have_cmove_flag;

static int have_cond_exec_flag;

static int have_lo_sum_flag;

static int have_peephole_flag;

static int have_peephole2_flag;

/* Maximum number of insns seen in a split.  */

static int max_insns_per_split = 1;

/* Maximum number of input insns for peephole2.  */

static int max_insns_per_peep2;

static int clobbers_seen_this_insn;

static int dup_operands_seen_this_insn;

static void walk_insn_part (rtx, int, int);

static void gen_insn (rtx);

static void gen_expand (rtx);

static void gen_split (rtx);

static void gen_peephole (rtx);

static void gen_peephole2 (rtx);

/* RECOG_P will be nonzero if this pattern was seen in a context where it will

   be used to recognize, rather than just generate an insn.

   NON_PC_SET_SRC will be nonzero if this pattern was seen in a SET_SRC

   of a SET whose destination is not (pc).  */

static void

walk_insn_part (rtx part, int recog_p, int non_pc_set_src)

{

  int i, j;

  RTX_CODE code;

  const char *format_ptr;

  if (part == 0)

    return;

  code = GET_CODE (part);

  switch (code)

    {

    case CLOBBER:

      clobbers_seen_this_insn++;

      break;

    case MATCH_OPERAND:

      if (XINT (part, 0) > max_recog_operands)

        max_recog_operands = XINT (part, 0);

      return;

    case MATCH_OP_DUP:

    case MATCH_PAR_DUP:

      ++dup_operands_seen_this_insn;

    case MATCH_SCRATCH:

    case MATCH_PARALLEL:

    case MATCH_OPERATOR:

      if (XINT (part, 0) > max_recog_operands)

        max_recog_operands = XINT (part, 0);

      /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or

         MATCH_PARALLEL.  */

      break;

    case LABEL_REF:

      if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND

          || GET_CODE (XEXP (part, 0)) == MATCH_DUP)

        break;

      return;

    case MATCH_DUP:

      ++dup_operands_seen_this_insn;

      if (XINT (part, 0) > max_recog_operands)

        max_recog_operands = XINT (part, 0);

      return;

    case CC0:

      if (recog_p)

        have_cc0_flag = 1;

      return;

    case LO_SUM:

      if (recog_p)

        have_lo_sum_flag = 1;

      return;

    case SET:

      walk_insn_part (SET_DEST (part), 0, recog_p);

      walk_insn_part (SET_SRC (part), recog_p,

                      GET_CODE (SET_DEST (part)) != PC);

      return;

    case IF_THEN_ELSE:

      /* Only consider this machine as having a conditional move if the

         two arms of the IF_THEN_ELSE are both MATCH_OPERAND.  Otherwise,

         we have some specific IF_THEN_ELSE construct (like the doz

         instruction on the RS/6000) that can't be used in the general

         context we want it for.  */

      if (recog_p && non_pc_set_src

          && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND

          && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)

        have_cmove_flag = 1;

      break;

    case COND_EXEC:

      if (recog_p)

        have_cond_exec_flag = 1;

      break;

    case REG: case CONST_INT: case SYMBOL_REF:

    case PC:

      return;

    default:

      break;

    }

  format_ptr = GET_RTX_FORMAT (GET_CODE (part));

  for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)

    switch (*format_ptr++)

      {

      case 'e':

      case 'u':

        walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);

        break;

      case 'E':

        if (XVEC (part, i) != NULL)

          for (j = 0; j < XVECLEN (part, i); j++)

            walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);

        break;

      }

}

static void

gen_insn (rtx insn)

{

  int i;

  /* Walk the insn pattern to gather the #define's status.  */

  clobbers_seen_this_insn = 0;

  dup_operands_seen_this_insn = 0;

  if (XVEC (insn, 1) != 0)

    for (i = 0; i < XVECLEN (insn, 1); i++)

      walk_insn_part (XVECEXP (insn, 1, i), 1, 0);

  if (clobbers_seen_this_insn > max_clobbers_per_insn)

    max_clobbers_per_insn = clobbers_seen_this_insn;

  if (dup_operands_seen_this_insn > max_dup_operands)

    max_dup_operands = dup_operands_seen_this_insn;

}

/* Similar but scan a define_expand.  */

static void

gen_expand (rtx insn)

{

  int i;

  /* Walk the insn pattern to gather the #define's status.  */

  /* Note that we don't bother recording the number of MATCH_DUPs

     that occur in a gen_expand, because only reload cares about that.  */

  if (XVEC (insn, 1) != 0)

    for (i = 0; i < XVECLEN (insn, 1); i++)

      {

        /* Compute the maximum SETs and CLOBBERS

           in any one of the sub-insns;

           don't sum across all of them.  */

        clobbers_seen_this_insn = 0;

        walk_insn_part (XVECEXP (insn, 1, i), 0, 0);

        if (clobbers_seen_this_insn > max_clobbers_per_insn)

          max_clobbers_per_insn = clobbers_seen_this_insn;

      }

}

/* Similar but scan a define_split.  */

static void

gen_split (rtx split)

{

  int i;

  /* Look through the patterns that are matched

     to compute the maximum operand number.  */

  for (i = 0; i < XVECLEN (split, 0); i++)

    walk_insn_part (XVECEXP (split, 0, i), 1, 0);

  /* Look at the number of insns this insn could split into.  */

  if (XVECLEN (split, 2) > max_insns_per_split)

    max_insns_per_split = XVECLEN (split, 2);

}

static void

gen_peephole (rtx peep)

{

  int i;

  /* Look through the patterns that are matched

     to compute the maximum operand number.  */

  for (i = 0; i < XVECLEN (peep, 0); i++)

    walk_insn_part (XVECEXP (peep, 0, i), 1, 0);

}

static void

gen_peephole2 (rtx peep)

{

  int i, n;

  /* Look through the patterns that are matched

     to compute the maximum operand number.  */

  for (i = XVECLEN (peep, 0) - 1; i >= 0; --i)

    walk_insn_part (XVECEXP (peep, 0, i), 1, 0);

  /* Look at the number of insns this insn can be matched from.  */

  for (i = XVECLEN (peep, 0) - 1, n = 0; i >= 0; --i)

    if (GET_CODE (XVECEXP (peep, 0, i)) != MATCH_DUP

        && GET_CODE (XVECEXP (peep, 0, i)) != MATCH_SCRATCH)

      n++;

  if (n > max_insns_per_peep2)

    max_insns_per_peep2 = n;

}

int

main (int argc, char **argv)

{

  rtx desc;

  progname = "genconfig";

  if (!init_rtx_reader_args (argc, argv))

    return (FATAL_EXIT_CODE);

  puts ("/* Generated automatically by the program `genconfig'");

  puts ("   from the machine description file `md'.  */\n");

  puts ("#ifndef GCC_INSN_CONFIG_H");

  puts ("#define GCC_INSN_CONFIG_H\n");

  /* Allow at least 30 operands for the sake of asm constructs.  */

  /* ??? We *really* ought to reorganize things such that there

     is no fixed upper bound.  */

  max_recog_operands = 29;  /* We will add 1 later.  */

  max_dup_operands = 1;

  /* Read the machine description.  */

  while (1)

    {

      int line_no, insn_code_number = 0;

      desc = read_md_rtx (&line_no, &insn_code_number);

      if (desc == NULL)

        break;

      switch (GET_CODE (desc))

        {

          case DEFINE_INSN:

            gen_insn (desc);

            break;

          case DEFINE_EXPAND:

            gen_expand (desc);

            break;

          case DEFINE_SPLIT:

            gen_split (desc);

            break;

          case DEFINE_PEEPHOLE2:

            have_peephole2_flag = 1;

            gen_peephole2 (desc);

            break;

          case DEFINE_PEEPHOLE:

            have_peephole_flag = 1;

            gen_peephole (desc);

            break;

          default:

            break;

        }

    }

  printf ("#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);

  printf ("#define MAX_DUP_OPERANDS %d\n", max_dup_operands);

  /* This is conditionally defined, in case the user writes code which emits

     more splits than we can readily see (and knows s/he does it).  */

  printf ("#ifndef MAX_INSNS_PER_SPLIT\n");

  printf ("#define MAX_INSNS_PER_SPLIT %d\n", max_insns_per_split);

  printf ("#endif\n");

  if (have_cc0_flag)

    {

      printf ("#define HAVE_cc0 1\n");

      printf ("#define CC0_P(X) ((X) == cc0_rtx)\n");

    }

  else

    {

      /* We output CC0_P this way to make sure that X is declared

         somewhere.  */

      printf ("#define CC0_P(X) ((X) ? 0 : 0)\n");

    }

  if (have_cmove_flag)

    printf ("#define HAVE_conditional_move 1\n");

  if (have_cond_exec_flag)

    printf ("#define HAVE_conditional_execution 1\n");

  if (have_lo_sum_flag)

    printf ("#define HAVE_lo_sum 1\n");

  if (have_peephole_flag)

    printf ("#define HAVE_peephole 1\n");

  if (have_peephole2_flag)

    {

      printf ("#define HAVE_peephole2 1\n");

      printf ("#define MAX_INSNS_PER_PEEP2 %d\n", max_insns_per_peep2);

    }

  puts("\n#endif /* GCC_INSN_CONFIG_H */");

  if (ferror (stdout) || fflush (stdout) || fclose (stdout))

    return FATAL_EXIT_CODE;

  return SUCCESS_EXIT_CODE;

}