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
41namespace JSC {
42
43class ArrayAllocationProfile;
44class ArrayProfile;
45class ObjectAllocationProfile;
46class VariableWatchpointSet;
47struct LLIntCallLinkInfo;
48struct ValueProfile;
49
50struct 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
123private:
124    Instruction(StructureChain*);
125    Instruction(Structure*);
126};
127
128} // namespace JSC
129
130namespace WTF {
131
132template<> struct VectorTraits<JSC::Instruction> : VectorTraitsBase<true, JSC::Instruction> { };
133
134} // namespace WTF
135
136#endif // Instruction_h
137