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/* Routines for expanding from SSA form to RTL.

   Copyright (C) 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/>.  */

#ifndef _SSAEXPAND_H

#define _SSAEXPAND_H 1

#include "tree-ssa-live.h"

/* This structure (of which only a singleton SA exists) is used to

   pass around information between the outof-SSA functions, cfgexpand

   and expand itself.  */

struct ssaexpand

{

  /* The computed partitions of SSA names are stored here.  */

  var_map map;

  /* For an SSA name version V bit V is set iff TER decided that

     its definition should be forwarded.  */

  bitmap values;

  /* For a partition number I partition_to_pseudo[I] contains the

     RTL expression of the allocated space of it (either a MEM or

     a pseudos REG).  */

  rtx *partition_to_pseudo;

  /* If partition I contains an SSA name that has a default def,

     bit I will be set in this bitmap.  */

  bitmap partition_has_default_def;

};

/* This is the singleton described above.  */

extern struct ssaexpand SA;

/* Returns the RTX expression representing the storage of the outof-SSA

   partition that the SSA name EXP is a member of.  */

static inline rtx

get_rtx_for_ssa_name (tree exp)

{

  int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp));

  if (SA.map->partition_to_view)

    p = SA.map->partition_to_view[p];

  gcc_assert (p != NO_PARTITION);

  return SA.partition_to_pseudo[p];

}

/* If TER decided to forward the definition of SSA name EXP this function

   returns the defining statement, otherwise NULL.  */

static inline gimple

get_gimple_for_ssa_name (tree exp)

{

  int v = SSA_NAME_VERSION (exp);

  if (SA.values && bitmap_bit_p (SA.values, v))

    return SSA_NAME_DEF_STMT (exp);

  return NULL;

}

/* In tree-outof-ssa.c.  */

void finish_out_of_ssa (struct ssaexpand *sa);

unsigned int rewrite_out_of_ssa (struct ssaexpand *sa);

void expand_phi_nodes (struct ssaexpand *sa);

#endif