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 };

    43 

    44 //------------------------------EncodeP--------------------------------

    45 // Encodes an oop pointers into its compressed form

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

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

    48 class EncodePNode : public EncodeNarrowPtrNode {

    49   public:

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

    51   EncodeNarrowPtrNode(value, type) {

    52     init_class_id(Class_EncodeP);

    53   }

    54   virtual int Opcode() const;

    55   virtual Node* Identity(PhaseGVN* phase);

    56   virtual const Type* Value(PhaseGVN* phase) const;

    57 };

    58 

    59 //------------------------------EncodePKlass--------------------------------

    60 // Encodes a klass pointer into its compressed form

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

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

    63 class EncodePKlassNode : public EncodeNarrowPtrNode {

    64   public:

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

    66   EncodeNarrowPtrNode(value, type) {

    67     init_class_id(Class_EncodePKlass);

    68   }

    69   virtual int Opcode() const;

    70   virtual Node* Identity(PhaseGVN* phase);

    71   virtual const Type* Value(PhaseGVN* phase) const;

    72 };

    73 

    74 //------------------------------DecodeNarrowPtr--------------------------------

    75 class DecodeNarrowPtrNode : public TypeNode {

    76   protected:

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

    78   TypeNode(type, 2) {

    79     init_class_id(Class_DecodeNarrowPtr);

    80     init_req(0, NULL);

    81     init_req(1, value);

    82   }

    83   public:

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

    85 };

    86 

    87 //------------------------------DecodeN--------------------------------

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

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

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

    91 class DecodeNNode : public DecodeNarrowPtrNode {

    92   public:

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

    94   DecodeNarrowPtrNode(value, type) {

    95     init_class_id(Class_DecodeN);

    96   }

    97   virtual int Opcode() const;

    98   virtual const Type* Value(PhaseGVN* phase) const;

    99   virtual Node* Identity(PhaseGVN* phase);

   100 };

   101 

   102 //------------------------------DecodeNKlass--------------------------------

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

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

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

   106 class DecodeNKlassNode : public DecodeNarrowPtrNode {

   107   public:

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

   109   DecodeNarrowPtrNode(value, type) {

   110     init_class_id(Class_DecodeNKlass);

   111   }

   112   virtual int Opcode() const;

   113   virtual const Type* Value(PhaseGVN* phase) const;

   114   virtual Node* Identity(PhaseGVN* phase);

   115 };

   116 

   117 #endif // SHARE_VM_OPTO_NARROWPTRNODE_HPP

   118