1/*
2 * Copyright (C) 2008, 2009 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 Computer, 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
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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#include "config.h"
30#include "JSActivation.h"
31
32#include "Arguments.h"
33#include "Interpreter.h"
34#include "JSFunction.h"
35
36namespace JSC {
37
38ASSERT_CLASS_FITS_IN_CELL(JSActivation);
39
40const ClassInfo JSActivation::info = { .className: "JSActivation", .parentClass: 0, .staticPropHashTable: 0, .classPropHashTableGetterFunction: 0 };
41
42JSActivation::JSActivation(CallFrame* callFrame, NonNullPassRefPtr<FunctionExecutable> functionExecutable)
43 : Base(callFrame->globalData().activationStructure, new JSActivationData(functionExecutable, callFrame->registers()))
44{
45}
46
47JSActivation::~JSActivation()
48{
49 delete d();
50}
51
52void JSActivation::markChildren(MarkStack& markStack)
53{
54 Base::markChildren(markStack);
55
56 Register* registerArray = d()->registerArray.get();
57 if (!registerArray)
58 return;
59
60 size_t numParametersMinusThis = d()->functionExecutable->parameterCount();
61
62 size_t count = numParametersMinusThis;
63 markStack.appendValues(values: registerArray, count);
64
65 size_t numVars = d()->functionExecutable->variableCount();
66
67 // Skip the call frame, which sits between the parameters and vars.
68 markStack.appendValues(values: registerArray + count + RegisterFile::CallFrameHeaderSize, count: numVars, properties: MayContainNullValues);
69}
70
71bool JSActivation::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
72{
73 if (symbolTableGet(propertyName, slot))
74 return true;
75
76 if (JSValue* location = getDirectLocation(propertyName)) {
77 slot.setValueSlot(location);
78 return true;
79 }
80
81 // Only return the built-in arguments object if it wasn't overridden above.
82 if (propertyName == exec->propertyNames().arguments) {
83 slot.setCustom(slotBase: this, getValue: getArgumentsGetter());
84 return true;
85 }
86
87 // We don't call through to JSObject because there's no way to give an
88 // activation object getter properties or a prototype.
89 ASSERT(!hasGetterSetterProperties());
90 ASSERT(prototype().isNull());
91 return false;
92}
93
94void JSActivation::put(ExecState*, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
95{
96 ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
97
98 if (symbolTablePut(propertyName, value))
99 return;
100
101 // We don't call through to JSObject because __proto__ and getter/setter
102 // properties are non-standard extensions that other implementations do not
103 // expose in the activation object.
104 ASSERT(!hasGetterSetterProperties());
105 putDirect(propertyName, value, attributes: 0, checkReadOnly: true, slot);
106}
107
108// FIXME: Make this function honor ReadOnly (const) and DontEnum
109void JSActivation::putWithAttributes(ExecState* exec, const Identifier& propertyName, JSValue value, unsigned attributes)
110{
111 ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
112
113 if (symbolTablePutWithAttributes(propertyName, value, attributes))
114 return;
115
116 // We don't call through to JSObject because __proto__ and getter/setter
117 // properties are non-standard extensions that other implementations do not
118 // expose in the activation object.
119 ASSERT(!hasGetterSetterProperties());
120 PutPropertySlot slot;
121 JSObject::putWithAttributes(exec, propertyName, value, attributes, checkReadOnly: true, slot);
122}
123
124bool JSActivation::deleteProperty(ExecState* exec, const Identifier& propertyName)
125{
126 if (propertyName == exec->propertyNames().arguments)
127 return false;
128
129 return Base::deleteProperty(exec, propertyName);
130}
131
132JSObject* JSActivation::toThisObject(ExecState* exec) const
133{
134 return exec->globalThisValue();
135}
136
137bool JSActivation::isDynamicScope() const
138{
139 return d()->functionExecutable->usesEval();
140}
141
142JSValue JSActivation::argumentsGetter(ExecState* exec, const Identifier&, const PropertySlot& slot)
143{
144 JSActivation* activation = asActivation(value: slot.slotBase());
145
146 if (activation->d()->functionExecutable->usesArguments()) {
147 PropertySlot slot;
148 activation->symbolTableGet(propertyName: exec->propertyNames().arguments, slot);
149 return slot.getValue(exec, propertyName: exec->propertyNames().arguments);
150 }
151
152 CallFrame* callFrame = CallFrame::create(callFrameBase: activation->d()->registers);
153 Arguments* arguments = callFrame->optionalCalleeArguments();
154 if (!arguments) {
155 arguments = new (callFrame) Arguments(callFrame);
156 arguments->copyRegisters();
157 callFrame->setCalleeArguments(arguments);
158 }
159 ASSERT(arguments->inherits(&Arguments::info));
160
161 return arguments;
162}
163
164// These two functions serve the purpose of isolating the common case from a
165// PIC branch.
166
167PropertySlot::GetValueFunc JSActivation::getArgumentsGetter()
168{
169 return argumentsGetter;
170}
171
172} // namespace JSC
173

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSActivation.cpp