1 /*

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

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  *

    23  */

    24 

    25 #include "precompiled.hpp"

    26 #include "opto/narrowptrnode.hpp"

    27 #include "opto/phaseX.hpp"

    28 

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

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

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

    32 

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

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

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

    36   }

    37   return this;

    38 }

    39 

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

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

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

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

    44 

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

    46   return t->make_ptr();

    47 }

    48 

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

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

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

    52 

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

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

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

    56   }

    57   return this;

    58 }

    59 

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

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

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

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

    64 

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

    66   return t->make_narrowoop();

    67 }

    68 

    69 

    70 Node *EncodeNarrowPtrNode::Ideal_DU_postCCP( PhaseCCP *ccp ) {

    71   return MemNode::Ideal_common_DU_postCCP(ccp, this, in(1));

    72 }

    73 

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

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

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

    77 

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

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

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

    81   }

    82   return this;

    83 }

    84 

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

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

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

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

    89 

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

    91   return t->make_ptr();

    92 }

    93 

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

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

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

    97 

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

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

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

   101   }

   102   return this;

   103 }

   104 

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

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

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

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

   109 

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

   111   return t->make_narrowklass();

   112 }

   113