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 #ifndef SHARE_VM_OPTO_NARROWPTRNODE_HPP

    26 #define SHARE_VM_OPTO_NARROWPTRNODE_HPP

    27 

    28 #include "opto/node.hpp"

    29 #include "opto/opcodes.hpp"

    30 

    31 //------------------------------EncodeNarrowPtr--------------------------------

    32 class EncodeNarrowPtrNode : public TypeNode {

    33   protected:

    34   EncodeNarrowPtrNode(Node* value, const Type* type):

    35   TypeNode(type, 2) {

    36     init_class_id(Class_EncodeNarrowPtr);

    37     init_req(0, NULL);

    38     init_req(1, value);

    39   }

    40   public:

    41   virtual uint  ideal_reg() const { return Op_RegN; }

    42   virtual Node *Ideal_DU_postCCP( PhaseCCP *ccp );

    43 };

    44 

    45 //------------------------------EncodeP--------------------------------

    46 // Encodes an oop pointers into its compressed form

    47 // Takes an extra argument which is the real heap base as a long which

    48 // may be useful for code generation in the backend.

    49 class EncodePNode : public EncodeNarrowPtrNode {

    50   public:

    51   EncodePNode(Node* value, const Type* type):

    52   EncodeNarrowPtrNode(value, type) {

    53     init_class_id(Class_EncodeP);

    54   }

    55   virtual int Opcode() const;

    56   virtual Node *Identity( PhaseTransform *phase );

    57   virtual const Type *Value( PhaseTransform *phase ) const;

    58 };

    59 

    60 //------------------------------EncodePKlass--------------------------------

    61 // Encodes a klass pointer into its compressed form

    62 // Takes an extra argument which is the real heap base as a long which

    63 // may be useful for code generation in the backend.

    64 class EncodePKlassNode : public EncodeNarrowPtrNode {

    65   public:

    66   EncodePKlassNode(Node* value, const Type* type):

    67   EncodeNarrowPtrNode(value, type) {

    68     init_class_id(Class_EncodePKlass);

    69   }

    70   virtual int Opcode() const;

    71   virtual Node *Identity( PhaseTransform *phase );

    72   virtual const Type *Value( PhaseTransform *phase ) const;

    73 };

    74 

    75 //------------------------------DecodeNarrowPtr--------------------------------

    76 class DecodeNarrowPtrNode : public TypeNode {

    77   protected:

    78   DecodeNarrowPtrNode(Node* value, const Type* type):

    79   TypeNode(type, 2) {

    80     init_class_id(Class_DecodeNarrowPtr);

    81     init_req(0, NULL);

    82     init_req(1, value);

    83   }

    84   public:

    85   virtual uint  ideal_reg() const { return Op_RegP; }

    86 };

    87 

    88 //------------------------------DecodeN--------------------------------

    89 // Converts a narrow oop into a real oop ptr.

    90 // Takes an extra argument which is the real heap base as a long which

    91 // may be useful for code generation in the backend.

    92 class DecodeNNode : public DecodeNarrowPtrNode {

    93   public:

    94   DecodeNNode(Node* value, const Type* type):

    95   DecodeNarrowPtrNode(value, type) {

    96     init_class_id(Class_DecodeN);

    97   }

    98   virtual int Opcode() const;

    99   virtual const Type *Value( PhaseTransform *phase ) const;

   100   virtual Node *Identity( PhaseTransform *phase );

   101 };

   102 

   103 //------------------------------DecodeNKlass--------------------------------

   104 // Converts a narrow klass pointer into a real klass ptr.

   105 // Takes an extra argument which is the real heap base as a long which

   106 // may be useful for code generation in the backend.

   107 class DecodeNKlassNode : public DecodeNarrowPtrNode {

   108   public:

   109   DecodeNKlassNode(Node* value, const Type* type):

   110   DecodeNarrowPtrNode(value, type) {

   111     init_class_id(Class_DecodeNKlass);

   112   }

   113   virtual int Opcode() const;

   114   virtual const Type *Value( PhaseTransform *phase ) const;

   115   virtual Node *Identity( PhaseTransform *phase );

   116 };

   117 

   118 #endif // SHARE_VM_OPTO_NARROWPTRNODE_HPP

   119