bytecode/Instruction.h

   1 /*
   2  * Copyright (C) 2008, 2012-2015 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 "BasicBlockLocation.h"
  33 #include "MacroAssembler.h"
  34 #include "Opcode.h"
  35 #include "SymbolTable.h"
  36 #include "TypeLocation.h"
  37 #include "PropertySlot.h"
  38 #include "SpecialPointer.h"
  39 #include "Structure.h"
  40 #include "StructureChain.h"
  41 #include "ToThisStatus.h"
  42 #include "VirtualRegister.h"
  43 #include <wtf/VectorTraits.h>
  44
  45 namespace JSC {
  46
  47 class ArrayAllocationProfile;
  48 class ArrayProfile;
  49 class ObjectAllocationProfile;
  50 class WatchpointSet;
  51 struct LLIntCallLinkInfo;
  52 struct ValueProfile;
  53
  54 struct Instruction {
  55     Instruction()
  56     {
  57         u.jsCell.clear();
  58     }
  59
  60     Instruction(Opcode opcode)
  61     {
  62 #if !ENABLE(COMPUTED_GOTO_OPCODES)
  63         // We have to initialize one of the pointer members to ensure that
  64         // the entire struct is initialized, when opcode is not a pointer.
  65         u.jsCell.clear();
  66 #endif
  67         u.opcode = opcode;
  68     }
  69
  70     Instruction(int operand)
  71     {
  72         // We have to initialize one of the pointer members to ensure that
  73         // the entire struct is initialized in 64-bit.
  74         u.jsCell.clear();
  75         u.operand = operand;
  76     }
  77
  78     Instruction(VM& vm, JSCell* owner, Structure* structure)
  79     {
  80         u.structure.clear();
  81         u.structure.set(vm, owner, structure);
  82     }
  83     Instruction(VM& vm, JSCell* owner, StructureChain* structureChain)
  84     {
  85         u.structureChain.clear();
  86         u.structureChain.set(vm, owner, structureChain);
  87     }
  88     Instruction(VM& vm, JSCell* owner, JSCell* jsCell)
  89     {
  90         u.jsCell.clear();
  91         u.jsCell.set(vm, owner, jsCell);
  92     }
  93
  94     Instruction(PropertySlot::GetValueFunc getterFunc) { u.getterFunc = getterFunc; }
  95
  96     Instruction(LLIntCallLinkInfo* callLinkInfo) { u.callLinkInfo = callLinkInfo; }
  97     Instruction(ValueProfile* profile) { u.profile = profile; }
  98     Instruction(ArrayProfile* profile) { u.arrayProfile = profile; }
  99     Instruction(ArrayAllocationProfile* profile) { u.arrayAllocationProfile = profile; }
 100     Instruction(ObjectAllocationProfile* profile) { u.objectAllocationProfile = profile; }
 101     Instruction(WriteBarrier<Unknown>* variablePointer) { u.variablePointer = variablePointer; }
 102     Instruction(Special::Pointer pointer) { u.specialPointer = pointer; }
 103     Instruction(UniquedStringImpl* uid) { u.uid = uid; }
 104     Instruction(bool* predicatePointer) { u.predicatePointer = predicatePointer; }
 105
 106     union {
 107         Opcode opcode;
 108         int operand;
 109         WriteBarrierBase<Structure> structure;
 110         WriteBarrierBase<SymbolTable> symbolTable;
 111         WriteBarrierBase<StructureChain> structureChain;
 112         WriteBarrierBase<JSCell> jsCell;
 113         WriteBarrier<Unknown>* variablePointer;
 114         Special::Pointer specialPointer;
 115         PropertySlot::GetValueFunc getterFunc;
 116         LLIntCallLinkInfo* callLinkInfo;
 117         UniquedStringImpl* uid;
 118         ValueProfile* profile;
 119         ArrayProfile* arrayProfile;
 120         ArrayAllocationProfile* arrayAllocationProfile;
 121         ObjectAllocationProfile* objectAllocationProfile;
 122         WatchpointSet* watchpointSet;
 123         void* pointer;
 124         bool* predicatePointer;
 125         ToThisStatus toThisStatus;
 126         TypeLocation* location;
 127         BasicBlockLocation* basicBlockLocation;
 128     } u;
 129
 130 private:
 131     Instruction(StructureChain*);
 132     Instruction(Structure*);
 133 };
 134
 135 } // namespace JSC
 136
 137 namespace WTF {
 138
 139 template<> struct VectorTraits<JSC::Instruction> : VectorTraitsBase<true, JSC::Instruction> { };
 140
 141 } // namespace WTF
 142
 143 #endif // Instruction_h