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/* Generate code from machine description to emit insns as rtl.

   Copyright (C) 1987, 1988, 1991, 1994, 1995, 1997, 1998, 1999, 2000, 2001,

   2003, 2004, 2005, 2007, 2008, 2009 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"

static int max_opno;

static int max_dup_opno;

static int max_scratch_opno;

static int insn_code_number;

static int insn_index_number;

/* Data structure for recording the patterns of insns that have CLOBBERs.

   We use this to output a function that adds these CLOBBERs to a

   previously-allocated PARALLEL expression.  */

struct clobber_pat

{

  struct clobber_ent *insns;

  rtx pattern;

  int first_clobber;

  struct clobber_pat *next;

  int has_hard_reg;

} *clobber_list;

/* Records one insn that uses the clobber list.  */

struct clobber_ent

{

  int code_number;              /* Counts only insns.  */

  struct clobber_ent *next;

};

static void max_operand_1               (rtx);

static int max_operand_vec              (rtx, int);

static void print_code                  (RTX_CODE);

static void gen_exp                     (rtx, enum rtx_code, char *);

static void gen_insn                    (rtx, int);

static void gen_expand                  (rtx);

static void gen_split                   (rtx);

static void output_add_clobbers         (void);

static void output_added_clobbers_hard_reg_p (void);

static void gen_rtx_scratch             (rtx, enum rtx_code);

static void output_peephole2_scratches  (rtx);

static void

max_operand_1 (rtx x)

{

  RTX_CODE code;

  int i;

  int len;

  const char *fmt;

  if (x == 0)

    return;

  code = GET_CODE (x);

  if (code == MATCH_OPERAND || code == MATCH_OPERATOR

      || code == MATCH_PARALLEL)

    max_opno = MAX (max_opno, XINT (x, 0));

  if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)

    max_dup_opno = MAX (max_dup_opno, XINT (x, 0));

  if (code == MATCH_SCRATCH)

    max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));

  fmt = GET_RTX_FORMAT (code);

  len = GET_RTX_LENGTH (code);

  for (i = 0; i < len; i++)

    {

      if (fmt[i] == 'e' || fmt[i] == 'u')

        max_operand_1 (XEXP (x, i));

      else if (fmt[i] == 'E')

        {

          int j;

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

            max_operand_1 (XVECEXP (x, i, j));

        }

    }

}

static int

max_operand_vec (rtx insn, int arg)

{

  int len = XVECLEN (insn, arg);

  int i;

  max_opno = -1;

  max_dup_opno = -1;

  max_scratch_opno = -1;

  for (i = 0; i < len; i++)

    max_operand_1 (XVECEXP (insn, arg, i));

  return max_opno + 1;

}

static void

print_code (RTX_CODE code)

{

  const char *p1;

  for (p1 = GET_RTX_NAME (code); *p1; p1++)

    putchar (TOUPPER(*p1));

}

static void

gen_rtx_scratch (rtx x, enum rtx_code subroutine_type)

{

  if (subroutine_type == DEFINE_PEEPHOLE2)

    {

      printf ("operand%d", XINT (x, 0));

    }

  else

    {

      printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));

    }

}

/* Print a C expression to construct an RTX just like X,

   substituting any operand references appearing within.  */

static void

gen_exp (rtx x, enum rtx_code subroutine_type, char *used)

{

  RTX_CODE code;

  int i;

  int len;

  const char *fmt;

  if (x == 0)

    {

      printf ("NULL_RTX");

      return;

    }

  code = GET_CODE (x);

  switch (code)

    {

    case MATCH_OPERAND:

    case MATCH_DUP:

      if (used)

        {

          if (used[XINT (x, 0)])

            {

              printf ("copy_rtx (operand%d)", XINT (x, 0));

              return;

            }

          used[XINT (x, 0)] = 1;

        }

      printf ("operand%d", XINT (x, 0));

      return;

    case MATCH_OP_DUP:

      printf ("gen_rtx_fmt_");

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

        printf ("e");

      printf (" (GET_CODE (operand%d), ", XINT (x, 0));

      if (GET_MODE (x) == VOIDmode)

        printf ("GET_MODE (operand%d)", XINT (x, 0));

      else

        printf ("%smode", GET_MODE_NAME (GET_MODE (x)));

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

        {

          printf (",\n\t\t");

          gen_exp (XVECEXP (x, 1, i), subroutine_type, used);

        }

      printf (")");

      return;

    case MATCH_OPERATOR:

      printf ("gen_rtx_fmt_");

      for (i = 0; i < XVECLEN (x, 2); i++)

        printf ("e");

      printf (" (GET_CODE (operand%d)", XINT (x, 0));

      printf (", %smode", GET_MODE_NAME (GET_MODE (x)));

      for (i = 0; i < XVECLEN (x, 2); i++)

        {

          printf (",\n\t\t");

          gen_exp (XVECEXP (x, 2, i), subroutine_type, used);

        }

      printf (")");

      return;

    case MATCH_PARALLEL:

    case MATCH_PAR_DUP:

      printf ("operand%d", XINT (x, 0));

      return;

    case MATCH_SCRATCH:

      gen_rtx_scratch (x, subroutine_type);

      return;

    case ADDRESS:

      fatal ("ADDRESS expression code used in named instruction pattern");

    case PC:

      printf ("pc_rtx");

      return;

    case CLOBBER:

      if (REG_P (XEXP (x, 0)))

        {

          printf ("gen_hard_reg_clobber (%smode, %i)", GET_MODE_NAME (GET_MODE (XEXP (x, 0))),

                                                     REGNO (XEXP (x, 0)));

          return;

        }

      break;

    case CC0:

      printf ("cc0_rtx");

      return;

    case CONST_INT:

      if (INTVAL (x) == 0)

        printf ("const0_rtx");

      else if (INTVAL (x) == 1)

        printf ("const1_rtx");

      else if (INTVAL (x) == -1)

        printf ("constm1_rtx");

      else if (-MAX_SAVED_CONST_INT <= INTVAL (x)

          && INTVAL (x) <= MAX_SAVED_CONST_INT)

        printf ("const_int_rtx[MAX_SAVED_CONST_INT + (%d)]",

                (int) INTVAL (x));

      else if (INTVAL (x) == STORE_FLAG_VALUE)

        printf ("const_true_rtx");

      else

        {

          printf ("GEN_INT (");

          printf (HOST_WIDE_INT_PRINT_DEC_C, INTVAL (x));

          printf (")");

        }

      return;

    case CONST_DOUBLE:

    case CONST_FIXED:

      /* These shouldn't be written in MD files.  Instead, the appropriate

         routines in varasm.c should be called.  */

      gcc_unreachable ();

    default:

      break;

    }

  printf ("gen_rtx_");

  print_code (code);

  printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));

  fmt = GET_RTX_FORMAT (code);

  len = GET_RTX_LENGTH (code);

  for (i = 0; i < len; i++)

    {

      if (fmt[i] == '0')

        break;

      printf (",\n\t");

      switch (fmt[i])

        {

        case 'e': case 'u':

          gen_exp (XEXP (x, i), subroutine_type, used);

          break;

        case 'i':

          printf ("%u", XINT (x, i));

          break;

        case 's':

          printf ("\"%s\"", XSTR (x, i));

          break;

        case 'E':

          {

            int j;

            printf ("gen_rtvec (%d", XVECLEN (x, i));

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

              {

                printf (",\n\t\t");

                gen_exp (XVECEXP (x, i, j), subroutine_type, used);

              }

            printf (")");

            break;

          }

        default:

          gcc_unreachable ();

        }

    }

  printf (")");

}

/* Generate the `gen_...' function for a DEFINE_INSN.  */

static void

gen_insn (rtx insn, int lineno)

{

  int operands;

  int i;

  /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)

     registers or MATCH_SCRATCHes.  If so, store away the information for

     later.  */

  if (XVEC (insn, 1))

    {

      int has_hard_reg = 0;

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

        {

          if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)

            break;

          if (REG_P (XEXP (XVECEXP (insn, 1, i), 0)))

            has_hard_reg = 1;

          else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)

            break;

        }

      if (i != XVECLEN (insn, 1) - 1)

        {

          struct clobber_pat *p;

          struct clobber_ent *link = XNEW (struct clobber_ent);

          int j;

          link->code_number = insn_code_number;

          /* See if any previous CLOBBER_LIST entry is the same as this

             one.  */

          for (p = clobber_list; p; p = p->next)

            {

              if (p->first_clobber != i + 1

                  || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))

                continue;

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

                {

                  rtx old_rtx = XEXP (XVECEXP (p->pattern, 1, j), 0);

                  rtx new_rtx = XEXP (XVECEXP (insn, 1, j), 0);

                  /* OLD and NEW_INSN are the same if both are to be a SCRATCH

                     of the same mode,

                     or if both are registers of the same mode and number.  */

                  if (! (GET_MODE (old_rtx) == GET_MODE (new_rtx)

                         && ((GET_CODE (old_rtx) == MATCH_SCRATCH

                              && GET_CODE (new_rtx) == MATCH_SCRATCH)

                             || (REG_P (old_rtx) && REG_P (new_rtx)

                                 && REGNO (old_rtx) == REGNO (new_rtx)))))

                    break;

                }

              if (j == XVECLEN (insn, 1))

                break;

            }

          if (p == 0)

            {

              p = XNEW (struct clobber_pat);

              p->insns = 0;

              p->pattern = insn;

              p->first_clobber = i + 1;

              p->next = clobber_list;

              p->has_hard_reg = has_hard_reg;

              clobber_list = p;

            }

          link->next = p->insns;

          p->insns = link;

        }

    }

  /* Don't mention instructions whose names are the null string

     or begin with '*'.  They are in the machine description just

     to be recognized.  */

  if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')

    return;

  printf ("/* %s:%d */\n", read_rtx_filename, lineno);

  /* Find out how many operands this function has.  */

  operands = max_operand_vec (insn, 1);

  if (max_dup_opno >= operands)

    fatal ("match_dup operand number has no match_operand");

  /* Output the function name and argument declarations.  */

  printf ("rtx\ngen_%s (", XSTR (insn, 0));

  if (operands)

    for (i = 0; i < operands; i++)

      if (i)

        printf (",\n\trtx operand%d ATTRIBUTE_UNUSED", i);

      else

        printf ("rtx operand%d ATTRIBUTE_UNUSED", i);

  else

    printf ("void");

  printf (")\n");

  printf ("{\n");

  /* Output code to construct and return the rtl for the instruction body.  */

  if (XVECLEN (insn, 1) == 1)

    {

      printf ("  return ");

      gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN, NULL);

      printf (";\n}\n\n");

    }

  else

    {

      char *used = XCNEWVEC (char, operands);

      printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",

              XVECLEN (insn, 1));

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

        {

          printf (",\n\t\t");

          gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN, used);

        }

      printf ("));\n}\n\n");

      XDELETEVEC (used);

    }

}

/* Generate the `gen_...' function for a DEFINE_EXPAND.  */

static void

gen_expand (rtx expand)

{

  int operands;

  int i;

  char *used;

  if (strlen (XSTR (expand, 0)) == 0)

    fatal ("define_expand lacks a name");

  if (XVEC (expand, 1) == 0)

    fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));

  /* Find out how many operands this function has.  */

  operands = max_operand_vec (expand, 1);

  /* Output the function name and argument declarations.  */

  printf ("rtx\ngen_%s (", XSTR (expand, 0));

  if (operands)

    for (i = 0; i < operands; i++)

      if (i)

        printf (",\n\trtx operand%d", i);

      else

        printf ("rtx operand%d", i);

  else

    printf ("void");

  printf (")\n");

  printf ("{\n");

  /* If we don't have any C code to write, only one insn is being written,

     and no MATCH_DUPs are present, we can just return the desired insn

     like we do for a DEFINE_INSN.  This saves memory.  */

  if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')

      && operands > max_dup_opno

      && XVECLEN (expand, 1) == 1)

    {

      printf ("  return ");

      gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);

      printf (";\n}\n\n");

      return;

    }

  /* For each operand referred to only with MATCH_DUPs,

     make a local variable.  */

  for (i = operands; i <= max_dup_opno; i++)

    printf ("  rtx operand%d;\n", i);

  for (; i <= max_scratch_opno; i++)

    printf ("  rtx operand%d ATTRIBUTE_UNUSED;\n", i);

  printf ("  rtx _val = 0;\n");

  printf ("  start_sequence ();\n");

  /* The fourth operand of DEFINE_EXPAND is some code to be executed

     before the actual construction.

     This code expects to refer to `operands'

     just as the output-code in a DEFINE_INSN does,

     but here `operands' is an automatic array.

     So copy the operand values there before executing it.  */

  if (XSTR (expand, 3) && *XSTR (expand, 3))

    {

      printf ("  {\n");

      if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)

        printf ("    rtx operands[%d];\n",

            MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));

      /* Output code to copy the arguments into `operands'.  */

      for (i = 0; i < operands; i++)

        printf ("    operands[%d] = operand%d;\n", i, i);

      /* Output the special code to be executed before the sequence

         is generated.  */

      print_rtx_ptr_loc (XSTR (expand, 3));

      printf ("%s\n", XSTR (expand, 3));

      /* Output code to copy the arguments back out of `operands'

         (unless we aren't going to use them at all).  */

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

        {

          for (i = 0; i < operands; i++)

            printf ("    operand%d = operands[%d];\n", i, i);

          for (; i <= max_dup_opno; i++)

            printf ("    operand%d = operands[%d];\n", i, i);

          for (; i <= max_scratch_opno; i++)

            printf ("    operand%d = operands[%d];\n", i, i);

        }

      printf ("  }\n");

    }

  /* Output code to construct the rtl for the instruction bodies.

     Use emit_insn to add them to the sequence being accumulated.

     But don't do this if the user's code has set `no_more' nonzero.  */

  used = XCNEWVEC (char,

                   MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));

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

    {

      rtx next = XVECEXP (expand, 1, i);

      if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)

          || (GET_CODE (next) == PARALLEL

              && ((GET_CODE (XVECEXP (next, 0, 0)) == SET

                   && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)

                  || GET_CODE (XVECEXP (next, 0, 0)) == RETURN))

          || GET_CODE (next) == RETURN)

        printf ("  emit_jump_insn (");

      else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)

               || GET_CODE (next) == CALL

               || (GET_CODE (next) == PARALLEL

                   && GET_CODE (XVECEXP (next, 0, 0)) == SET

                   && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)

               || (GET_CODE (next) == PARALLEL

                   && GET_CODE (XVECEXP (next, 0, 0)) == CALL))

        printf ("  emit_call_insn (");

      else if (LABEL_P (next))

        printf ("  emit_label (");

      else if (GET_CODE (next) == MATCH_OPERAND

               || GET_CODE (next) == MATCH_DUP

               || GET_CODE (next) == MATCH_OPERATOR

               || GET_CODE (next) == MATCH_OP_DUP

               || GET_CODE (next) == MATCH_PARALLEL

               || GET_CODE (next) == MATCH_PAR_DUP

               || GET_CODE (next) == PARALLEL)

        printf ("  emit (");

      else

        printf ("  emit_insn (");

      gen_exp (next, DEFINE_EXPAND, used);

      printf (");\n");

      if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC

          && GET_CODE (SET_SRC (next)) == LABEL_REF)

        printf ("  emit_barrier ();");

    }

  XDELETEVEC (used);

  /* Call `get_insns' to extract the list of all the

     insns emitted within this gen_... function.  */

  printf ("  _val = get_insns ();\n");

  printf ("  end_sequence ();\n");

  printf ("  return _val;\n}\n\n");

}

/* Like gen_expand, but generates insns resulting from splitting SPLIT.  */

static void

gen_split (rtx split)

{

  int i;

  int operands;

  const char *const name =

    ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");

  const char *unused;

  char *used;

  if (XVEC (split, 0) == 0)

    fatal ("define_%s (definition %d) lacks a pattern", name,

           insn_index_number);

  else if (XVEC (split, 2) == 0)

    fatal ("define_%s (definition %d) lacks a replacement pattern", name,

           insn_index_number);

  /* Find out how many operands this function has.  */

  max_operand_vec (split, 2);

  operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;