/*

 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

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

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "opto/narrowptrnode.hpp"

#include "opto/phaseX.hpp"

Node* DecodeNNode::Identity(PhaseTransform* phase) {

  const Type *t = phase->type( in(1) );

  if( t == Type::TOP ) return in(1);

  if (in(1)->is_EncodeP()) {

    // (DecodeN (EncodeP p)) -> p

    return in(1)->in(1);

  }

  return this;

}

const Type *DecodeNNode::Value( PhaseTransform *phase ) const {

  const Type *t = phase->type( in(1) );

  if (t == Type::TOP) return Type::TOP;

  if (t == TypeNarrowOop::NULL_PTR) return TypePtr::NULL_PTR;

  assert(t->isa_narrowoop(), "only  narrowoop here");

  return t->make_ptr();

}

Node* EncodePNode::Identity(PhaseTransform* phase) {

  const Type *t = phase->type( in(1) );

  if( t == Type::TOP ) return in(1);

  if (in(1)->is_DecodeN()) {

    // (EncodeP (DecodeN p)) -> p

    return in(1)->in(1);

  }

  return this;

}

const Type *EncodePNode::Value( PhaseTransform *phase ) const {

  const Type *t = phase->type( in(1) );

  if (t == Type::TOP) return Type::TOP;

  if (t == TypePtr::NULL_PTR) return TypeNarrowOop::NULL_PTR;

  assert(t->isa_oop_ptr(), "only oopptr here");

  return t->make_narrowoop();

}

Node* DecodeNKlassNode::Identity(PhaseTransform* phase) {

  const Type *t = phase->type( in(1) );

  if( t == Type::TOP ) return in(1);

  if (in(1)->is_EncodePKlass()) {

    // (DecodeNKlass (EncodePKlass p)) -> p

    return in(1)->in(1);

  }

  return this;

}

const Type *DecodeNKlassNode::Value( PhaseTransform *phase ) const {

  const Type *t = phase->type( in(1) );

  if (t == Type::TOP) return Type::TOP;

  assert(t != TypeNarrowKlass::NULL_PTR, "null klass?");

  assert(t->isa_narrowklass(), "only narrow klass ptr here");

  return t->make_ptr();

}

Node* EncodePKlassNode::Identity(PhaseTransform* phase) {

  const Type *t = phase->type( in(1) );

  if( t == Type::TOP ) return in(1);

  if (in(1)->is_DecodeNKlass()) {

    // (EncodePKlass (DecodeNKlass p)) -> p

    return in(1)->in(1);

  }

  return this;

}

const Type *EncodePKlassNode::Value( PhaseTransform *phase ) const {

  const Type *t = phase->type( in(1) );

  if (t == Type::TOP) return Type::TOP;

  assert (t != TypePtr::NULL_PTR, "null klass?");

  assert(UseCompressedClassPointers && t->isa_klassptr(), "only klass ptr here");

  return t->make_narrowklass();

}