bytecode/Instruction.h

   1 /*
   2  * Copyright (C) 2008, 2012, 2013 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef Instruction_h
  30 #define Instruction_h
  31
  32 #include "MacroAssembler.h"
  33 #include "Opcode.h"
  34 #include "PropertySlot.h"
  35 #include "SpecialPointer.h"
  36 #include "Structure.h"
  37 #include "StructureChain.h"
  38 #include "VirtualRegister.h"
  39 #include <wtf/VectorTraits.h>
  40
  41 namespace JSC {
  42
  43 class ArrayAllocationProfile;
  44 class ArrayProfile;
  45 class ObjectAllocationProfile;
  46 class VariableWatchpointSet;
  47 struct LLIntCallLinkInfo;
  48 struct ValueProfile;
  49
  50 struct Instruction {
  51     Instruction()
  52     {
  53         u.jsCell.clear();
  54     }
  55
  56     Instruction(Opcode opcode)
  57     {
  58 #if !ENABLE(COMPUTED_GOTO_OPCODES)
  59         // We have to initialize one of the pointer members to ensure that
  60         // the entire struct is initialized, when opcode is not a pointer.
  61         u.jsCell.clear();
  62 #endif
  63         u.opcode = opcode;
  64     }
  65
  66     Instruction(int operand)
  67     {
  68         // We have to initialize one of the pointer members to ensure that
  69         // the entire struct is initialized in 64-bit.
  70         u.jsCell.clear();
  71         u.operand = operand;
  72     }
  73
  74     Instruction(VM& vm, JSCell* owner, Structure* structure)
  75     {
  76         u.structure.clear();
  77         u.structure.set(vm, owner, structure);
  78     }
  79     Instruction(VM& vm, JSCell* owner, StructureChain* structureChain)
  80     {
  81         u.structureChain.clear();
  82         u.structureChain.set(vm, owner, structureChain);
  83     }
  84     Instruction(VM& vm, JSCell* owner, JSCell* jsCell)
  85     {
  86         u.jsCell.clear();
  87         u.jsCell.set(vm, owner, jsCell);
  88     }
  89
  90     Instruction(PropertySlot::GetValueFunc getterFunc) { u.getterFunc = getterFunc; }
  91
  92     Instruction(LLIntCallLinkInfo* callLinkInfo) { u.callLinkInfo = callLinkInfo; }
  93     Instruction(ValueProfile* profile) { u.profile = profile; }
  94     Instruction(ArrayProfile* profile) { u.arrayProfile = profile; }
  95     Instruction(ArrayAllocationProfile* profile) { u.arrayAllocationProfile = profile; }
  96     Instruction(ObjectAllocationProfile* profile) { u.objectAllocationProfile = profile; }
  97     Instruction(WriteBarrier<Unknown>* registerPointer) { u.registerPointer = registerPointer; }
  98     Instruction(Special::Pointer pointer) { u.specialPointer = pointer; }
  99     Instruction(StringImpl* uid) { u.uid = uid; }
 100     Instruction(bool* predicatePointer) { u.predicatePointer = predicatePointer; }
 101
 102     union {
 103         Opcode opcode;
 104         int operand;
 105         WriteBarrierBase<Structure> structure;
 106         WriteBarrierBase<StructureChain> structureChain;
 107         WriteBarrierBase<JSCell> jsCell;
 108         WriteBarrier<Unknown>* registerPointer;
 109         Special::Pointer specialPointer;
 110         PropertySlot::GetValueFunc getterFunc;
 111         LLIntCallLinkInfo* callLinkInfo;
 112         StringImpl* uid;
 113         ValueProfile* profile;
 114         ArrayProfile* arrayProfile;
 115         ArrayAllocationProfile* arrayAllocationProfile;
 116         ObjectAllocationProfile* objectAllocationProfile;
 117         VariableWatchpointSet* watchpointSet;
 118         WriteBarrierBase<JSActivation> activation;
 119         void* pointer;
 120         bool* predicatePointer;
 121     } u;
 122
 123 private:
 124     Instruction(StructureChain*);
 125     Instruction(Structure*);
 126 };
 127
 128 } // namespace JSC
 129
 130 namespace WTF {
 131
 132 template<> struct VectorTraits<JSC::Instruction> : VectorTraitsBase<true, JSC::Instruction> { };
 133
 134 } // namespace WTF
 135
 136 #endif // Instruction_h