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