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 uint 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 uint 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 uint 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 uint 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 
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