1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/*
* Copyright (C) 2008, 2009, 2013, 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef JSLexicalEnvironment_h
#define JSLexicalEnvironment_h
#include "CodeBlock.h"
#include "CopiedSpaceInlines.h"
#include "JSEnvironmentRecord.h"
#include "Nodes.h"
#include "SymbolTable.h"
namespace JSC {
class Register;
class JSLexicalEnvironment : public JSEnvironmentRecord {
private:
JSLexicalEnvironment(VM&, CallFrame*, Register*, SymbolTable*);
public:
typedef JSEnvironmentRecord Base;
static JSLexicalEnvironment* create(VM& vm, CallFrame* callFrame, Register* registers, CodeBlock* codeBlock)
{
SymbolTable* symbolTable = codeBlock->symbolTable();
ASSERT(codeBlock->codeType() == FunctionCode);
JSLexicalEnvironment* lexicalEnvironment = new (
NotNull,
allocateCell<JSLexicalEnvironment>(
vm.heap,
allocationSize(symbolTable)
)
) JSLexicalEnvironment(vm, callFrame, registers, symbolTable);
lexicalEnvironment->finishCreation(vm);
return lexicalEnvironment;
}
static JSLexicalEnvironment* create(VM& vm, CallFrame* callFrame, CodeBlock* codeBlock)
{
return create(vm, callFrame, callFrame->registers() + codeBlock->framePointerOffsetToGetActivationRegisters(), codeBlock);
}
static void visitChildren(JSCell*, SlotVisitor&);
static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
static void getOwnNonIndexPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
static bool deleteProperty(JSCell*, ExecState*, PropertyName);
static JSValue toThis(JSCell*, ExecState*, ECMAMode);
void tearOff(VM&);
DECLARE_INFO;
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject) { return Structure::create(vm, globalObject, jsNull(), TypeInfo(ActivationObjectType, StructureFlags), info()); }
WriteBarrierBase<Unknown>& registerAt(int) const;
bool isValidIndex(int) const;
bool isValid(const SymbolTableEntry&) const;
bool isTornOff();
int registersOffset();
static int registersOffset(SymbolTable*);
protected:
static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesGetPropertyNames | Base::StructureFlags;
private:
bool symbolTableGet(PropertyName, PropertySlot&);
bool symbolTableGet(PropertyName, PropertyDescriptor&);
bool symbolTableGet(PropertyName, PropertySlot&, bool& slotIsWriteable);
bool symbolTablePut(ExecState*, PropertyName, JSValue, bool shouldThrow);
bool symbolTablePutWithAttributes(VM&, PropertyName, JSValue, unsigned attributes);
static EncodedJSValue argumentsGetter(ExecState*, JSObject*, EncodedJSValue, PropertyName);
static size_t allocationSize(SymbolTable*);
static size_t storageOffset();
WriteBarrier<Unknown>* storage(); // captureCount() number of registers.
};
extern int activationCount;
extern int allTheThingsCount;
inline JSLexicalEnvironment::JSLexicalEnvironment(VM& vm, CallFrame* callFrame, Register* registers, SymbolTable* symbolTable)
: Base(
vm,
callFrame->lexicalGlobalObject()->activationStructure(),
registers,
callFrame->scope(),
symbolTable)
{
WriteBarrier<Unknown>* storage = this->storage();
size_t captureCount = symbolTable->captureCount();
for (size_t i = 0; i < captureCount; ++i)
new (NotNull, &storage[i]) WriteBarrier<Unknown>;
}
JSLexicalEnvironment* asActivation(JSValue);
inline JSLexicalEnvironment* asActivation(JSValue value)
{
ASSERT(asObject(value)->inherits(JSLexicalEnvironment::info()));
return jsCast<JSLexicalEnvironment*>(asObject(value));
}
ALWAYS_INLINE JSLexicalEnvironment* Register::lexicalEnvironment() const
{
return asActivation(jsValue());
}
inline int JSLexicalEnvironment::registersOffset(SymbolTable* symbolTable)
{
return storageOffset() + ((symbolTable->captureCount() - symbolTable->captureStart() - 1) * sizeof(WriteBarrier<Unknown>));
}
inline void JSLexicalEnvironment::tearOff(VM& vm)
{
ASSERT(!isTornOff());
WriteBarrierBase<Unknown>* dst = reinterpret_cast_ptr<WriteBarrierBase<Unknown>*>(
reinterpret_cast<char*>(this) + registersOffset(symbolTable()));
WriteBarrierBase<Unknown>* src = m_registers;
int captureEnd = symbolTable()->captureEnd();
for (int i = symbolTable()->captureStart(); i > captureEnd; --i)
dst[i].set(vm, this, src[i].get());
m_registers = dst;
ASSERT(isTornOff());
}
inline bool JSLexicalEnvironment::isTornOff()
{
return m_registers == reinterpret_cast_ptr<WriteBarrierBase<Unknown>*>(
reinterpret_cast<char*>(this) + registersOffset(symbolTable()));
}
inline size_t JSLexicalEnvironment::storageOffset()
{
return WTF::roundUpToMultipleOf<sizeof(WriteBarrier<Unknown>)>(sizeof(JSLexicalEnvironment));
}
inline WriteBarrier<Unknown>* JSLexicalEnvironment::storage()
{
return reinterpret_cast_ptr<WriteBarrier<Unknown>*>(
reinterpret_cast<char*>(this) + storageOffset());
}
inline size_t JSLexicalEnvironment::allocationSize(SymbolTable* symbolTable)
{
size_t objectSizeInBytes = WTF::roundUpToMultipleOf<sizeof(WriteBarrier<Unknown>)>(sizeof(JSLexicalEnvironment));
size_t storageSizeInBytes = symbolTable->captureCount() * sizeof(WriteBarrier<Unknown>);
return objectSizeInBytes + storageSizeInBytes;
}
inline bool JSLexicalEnvironment::isValidIndex(int index) const
{
if (index > symbolTable()->captureStart())
return false;
if (index <= symbolTable()->captureEnd())
return false;
return true;
}
inline bool JSLexicalEnvironment::isValid(const SymbolTableEntry& entry) const
{
return isValidIndex(entry.getIndex());
}
inline WriteBarrierBase<Unknown>& JSLexicalEnvironment::registerAt(int index) const
{
ASSERT(isValidIndex(index));
return Base::registerAt(index);
}
} // namespace JSC
#endif // JSLexicalEnvironment_h
|
