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/* Generate code from machine description to extract operands from insn as rtl.

   Copyright (C) 1987, 1991, 1992, 1993, 1997, 1998, 1999, 2000, 2003,

   2004, 2005, 2007, 2008, 2009, 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 "read-md.h"

#include "gensupport.h"

#include "vec.h"

#include "vecprim.h"

/* This structure contains all the information needed to describe one

   set of extractions methods.  Each method may be used by more than

   one pattern if the operands are in the same place.

   The string for each operand describes that path to the operand and

   contains `0' through `9' when going into an expression and `a' through

   `z' when going into a vector.  We assume here that only the first operand

   of an rtl expression is a vector.  genrecog.c makes the same assumption

   (and uses the same representation) and it is currently true.  */

typedef char *locstr;

struct extraction

{

  unsigned int op_count;

  unsigned int dup_count;

  locstr *oplocs;

  locstr *duplocs;

  int *dupnums;

  struct code_ptr *insns;

  struct extraction *next;

};

/* Holds a single insn code that uses an extraction method.  */

struct code_ptr

{

  int insn_code;

  struct code_ptr *next;

};

/* All extractions needed for this machine description.  */

static struct extraction *extractions;

/* All insn codes for old-style peepholes.  */

static struct code_ptr *peepholes;

/* This structure is used by gen_insn and walk_rtx to accumulate the

   data that will be used to produce an extractions structure.  */

DEF_VEC_P(locstr);

DEF_VEC_ALLOC_P(locstr,heap);

struct accum_extract

{

  VEC(locstr,heap) *oplocs;

  VEC(locstr,heap) *duplocs;

  VEC(int,heap)    *dupnums;

  VEC(char,heap)   *pathstr;

};

int line_no;

/* Forward declarations.  */

static void walk_rtx (rtx, struct accum_extract *);

static void

gen_insn (rtx insn, int insn_code_number)

{

  int i;

  unsigned int op_count, dup_count, j;

  struct extraction *p;

  struct code_ptr *link;

  struct accum_extract acc;

  acc.oplocs  = VEC_alloc (locstr,heap, 10);

  acc.duplocs = VEC_alloc (locstr,heap, 10);

  acc.dupnums = VEC_alloc (int,heap,    10);

  acc.pathstr = VEC_alloc (char,heap,   20);

  /* Walk the insn's pattern, remembering at all times the path

     down to the walking point.  */

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

    walk_rtx (XVECEXP (insn, 1, 0), &acc);

  else

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

      {

        VEC_safe_push (char,heap, acc.pathstr, 'a' + i);

        walk_rtx (XVECEXP (insn, 1, i), &acc);

        VEC_pop (char, acc.pathstr);

      }

  link = XNEW (struct code_ptr);

  link->insn_code = insn_code_number;

  /* See if we find something that already had this extraction method.  */

  op_count = VEC_length (locstr, acc.oplocs);

  dup_count = VEC_length (locstr, acc.duplocs);

  gcc_assert (dup_count == VEC_length (int, acc.dupnums));

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

    {

      if (p->op_count != op_count || p->dup_count != dup_count)

        continue;

      for (j = 0; j < op_count; j++)

        {

          char *a = p->oplocs[j];

          char *b = VEC_index (locstr, acc.oplocs, j);

          if (a != b && (!a || !b || strcmp (a, b)))

            break;

        }

      if (j != op_count)

        continue;

      for (j = 0; j < dup_count; j++)

        if (p->dupnums[j] != VEC_index (int, acc.dupnums, j)

            || strcmp (p->duplocs[j], VEC_index (locstr, acc.duplocs, j)))

          break;

      if (j != dup_count)

        continue;

      /* This extraction is the same as ours.  Just link us in.  */

      link->next = p->insns;

      p->insns = link;

      goto done;

    }

  /* Otherwise, make a new extraction method.  We stash the arrays

     after the extraction structure in memory.  */

  p = XNEWVAR (struct extraction, sizeof (struct extraction)

               + op_count*sizeof (char *)

               + dup_count*sizeof (char *)

               + dup_count*sizeof (int));

  p->op_count = op_count;

  p->dup_count = dup_count;

  p->next = extractions;

  extractions = p;

  p->insns = link;

  link->next = 0;

  p->oplocs = (char **)((char *)p + sizeof (struct extraction));

  p->duplocs = p->oplocs + op_count;

  p->dupnums = (int *)(p->duplocs + dup_count);

  memcpy(p->oplocs,  VEC_address(locstr,acc.oplocs),   op_count*sizeof(locstr));

  memcpy(p->duplocs, VEC_address(locstr,acc.duplocs), dup_count*sizeof(locstr));

  memcpy(p->dupnums, VEC_address(int,   acc.dupnums), dup_count*sizeof(int));

 done:

  VEC_free (locstr,heap, acc.oplocs);

  VEC_free (locstr,heap, acc.duplocs);

  VEC_free (int,heap,    acc.dupnums);

  VEC_free (char,heap,   acc.pathstr);

}

/* Helper subroutine of walk_rtx: given a VEC(locstr), an index, and a

   string, insert the string at the index, which should either already

   exist and be NULL, or not yet exist within the vector.  In the latter

   case the vector is enlarged as appropriate.  */

static void

VEC_safe_set_locstr (VEC(locstr,heap) **vp, unsigned int ix, char *str)

{

  if (ix < VEC_length (locstr, *vp))

    {

      if (VEC_index (locstr, *vp, ix))

        {

          message_with_line (line_no, "repeated operand number %d", ix);

          have_error = 1;

        }

      else

        VEC_replace (locstr, *vp, ix, str);

    }

  else

    {

      while (ix > VEC_length (locstr, *vp))

        VEC_safe_push (locstr, heap, *vp, 0);

      VEC_safe_push (locstr, heap, *vp, str);

    }

}

/* Another helper subroutine of walk_rtx: given a VEC(char), convert it

   to a NUL-terminated string in malloc memory.  */

static char *

VEC_char_to_string (VEC(char,heap) *v)

{

  size_t n = VEC_length (char, v);

  char *s = XNEWVEC (char, n + 1);

  memcpy (s, VEC_address (char, v), n);

  s[n] = '\0';

  return s;

}

static void

walk_rtx (rtx x, struct accum_extract *acc)

{

  RTX_CODE code;

  int i, len, base;

  const char *fmt;

  if (x == 0)

    return;

  code = GET_CODE (x);

  switch (code)

    {

    case PC:

    case CC0:

    case CONST_INT:

    case SYMBOL_REF:

      return;

    case MATCH_OPERAND:

    case MATCH_SCRATCH:

      VEC_safe_set_locstr (&acc->oplocs, XINT (x, 0),

                           VEC_char_to_string (acc->pathstr));

      break;

    case MATCH_OPERATOR:

    case MATCH_PARALLEL:

      VEC_safe_set_locstr (&acc->oplocs, XINT (x, 0),

                           VEC_char_to_string (acc->pathstr));

      base = (code == MATCH_OPERATOR ? '0' : 'a');

      for (i = XVECLEN (x, 2) - 1; i >= 0; i--)

        {

          VEC_safe_push (char,heap, acc->pathstr, base + i);

          walk_rtx (XVECEXP (x, 2, i), acc);

          VEC_pop (char, acc->pathstr);

        }

      return;

    case MATCH_DUP:

    case MATCH_PAR_DUP:

    case MATCH_OP_DUP:

      VEC_safe_push (locstr,heap, acc->duplocs,

                     VEC_char_to_string (acc->pathstr));

      VEC_safe_push (int,heap, acc->dupnums, XINT (x, 0));

      if (code == MATCH_DUP)

        break;

      base = (code == MATCH_OP_DUP ? '0' : 'a');

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

        {

          VEC_safe_push (char,heap, acc->pathstr, base + i);

          walk_rtx (XVECEXP (x, 1, i), acc);

          VEC_pop (char, acc->pathstr);

        }

      return;

    default:

      break;

    }

  fmt = GET_RTX_FORMAT (code);

  len = GET_RTX_LENGTH (code);

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

    {

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

        {

          VEC_safe_push (char,heap, acc->pathstr, '0' + i);

          walk_rtx (XEXP (x, i), acc);

          VEC_pop (char, acc->pathstr);

        }

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

        {

          int j;

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

            {

              VEC_safe_push (char,heap, acc->pathstr, 'a' + j);

              walk_rtx (XVECEXP (x, i, j), acc);

              VEC_pop (char, acc->pathstr);

            }

        }

    }

}

/* Given a PATH, representing a path down the instruction's

   pattern from the root to a certain point, output code to

   evaluate to the rtx at that point.  */

static void

print_path (const char *path)

{

  int len = strlen (path);

  int i;

  if (len == 0)

    {

      /* Don't emit "pat", since we may try to take the address of it,

         which isn't what is intended.  */

      fputs ("PATTERN (insn)", stdout);

      return;

    }

  /* We first write out the operations (XEXP or XVECEXP) in reverse

     order, then write "pat", then the indices in forward order.  */

  for (i = len - 1; i >= 0 ; i--)

    {

      if (ISLOWER (path[i]))

        fputs ("XVECEXP (", stdout);

      else if (ISDIGIT (path[i]))

        fputs ("XEXP (", stdout);

      else

        gcc_unreachable ();

    }

  fputs ("pat", stdout);

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

    {

      if (ISLOWER (path[i]))

        printf (", 0, %d)", path[i] - 'a');

      else if (ISDIGIT(path[i]))

        printf (", %d)", path[i] - '0');

      else

        gcc_unreachable ();

    }

}

static void

print_header (void)

{

  /* N.B. Code below avoids putting squiggle braces in column 1 inside

     a string, because this confuses some editors' syntax highlighting

     engines.  */

  puts ("\

/* Generated automatically by the program `genextract'\n\

   from the machine description file `md'.  */\n\

\n\

#include \"config.h\"\n\

#include \"system.h\"\n\

#include \"coretypes.h\"\n\

#include \"tm.h\"\n\

#include \"rtl.h\"\n\

#include \"insn-config.h\"\n\

#include \"recog.h\"\n\

#include \"diagnostic-core.h\"\n\

\n\

/* This variable is used as the \"location\" of any missing operand\n\

   whose numbers are skipped by a given pattern.  */\n\

static rtx junk ATTRIBUTE_UNUSED;\n");

  puts ("\

void\n\

insn_extract (rtx insn)\n{\n\

  rtx *ro = recog_data.operand;\n\

  rtx **ro_loc = recog_data.operand_loc;\n\

  rtx pat = PATTERN (insn);\n\

  int i ATTRIBUTE_UNUSED; /* only for peepholes */\n\

\n\

#ifdef ENABLE_CHECKING\n\

  memset (ro, 0xab, sizeof (*ro) * MAX_RECOG_OPERANDS);\n\

  memset (ro_loc, 0xab, sizeof (*ro_loc) * MAX_RECOG_OPERANDS);\n\

#endif\n");

  puts ("\

  switch (INSN_CODE (insn))\n\

    {\n\

    default:\n\

      /* Control reaches here if insn_extract has been called with an\n\

         unrecognizable insn (code -1), or an insn whose INSN_CODE\n\

         corresponds to a DEFINE_EXPAND in the machine description;\n\

         either way, a bug.  */\n\

      if (INSN_CODE (insn) < 0)\n\

        fatal_insn (\"unrecognizable insn:\", insn);\n\

      else\n\

        fatal_insn (\"insn with invalid code number:\", insn);\n");

}

int

main (int argc, char **argv)

{

  rtx desc;

  unsigned int i;

  struct extraction *p;

  struct code_ptr *link;

  const char *name;

  int insn_code_number;

  progname = "genextract";

  if (!init_rtx_reader_args (argc, argv))

    return (FATAL_EXIT_CODE);

  /* Read the machine description.  */

  while ((desc = read_md_rtx (&line_no, &insn_code_number)) != NULL)

    {

       if (GET_CODE (desc) == DEFINE_INSN)

         gen_insn (desc, insn_code_number);

      else if (GET_CODE (desc) == DEFINE_PEEPHOLE)

        {

          struct code_ptr *link = XNEW (struct code_ptr);

          link->insn_code = insn_code_number;

          link->next = peepholes;

          peepholes = link;

        }

    }

  if (have_error)

    return FATAL_EXIT_CODE;

  print_header ();

  /* Write out code to handle peepholes and the insn_codes that it should

     be called for.  */

  if (peepholes)

    {

      for (link = peepholes; link; link = link->next)

        printf ("    case %d:\n", link->insn_code);

      /* The vector in the insn says how many operands it has.

         And all it contains are operands.  In fact, the vector was

         created just for the sake of this function.  We need to set the

         location of the operands for sake of simplifications after

         extraction, like eliminating subregs.  */

      puts ("      for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n"

            "          ro[i] = *(ro_loc[i] = &XVECEXP (pat, 0, i));\n"

            "      break;\n");

    }

  /* Write out all the ways to extract insn operands.  */

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

    {

      for (link = p->insns; link; link = link->next)

        {

          i = link->insn_code;

          name = get_insn_name (i);

          if (name)

            printf ("    case %d:  /* %s */\n", i, name);

          else

            printf ("    case %d:\n", i);

        }

      for (i = 0; i < p->op_count; i++)

        {

          if (p->oplocs[i] == 0)

            {

              printf ("      ro[%d] = const0_rtx;\n", i);

              printf ("      ro_loc[%d] = &junk;\n", i);

            }

          else

            {

              printf ("      ro[%d] = *(ro_loc[%d] = &", i, i);

              print_path (p->oplocs[i]);

              puts (");");

            }

        }

      for (i = 0; i < p->dup_count; i++)

        {

          printf ("      recog_data.dup_loc[%d] = &", i);

          print_path (p->duplocs[i]);

          puts (";");

          printf ("      recog_data.dup_num[%d] = %d;\n", i, p->dupnums[i]);

        }

      puts ("      break;\n");

    }

  puts ("    }\n}");

  fflush (stdout);

  return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);

}