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 |
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 | #include "config.h" |
30 | #include "JSActivation.h" |
31 | |
32 | #include "Arguments.h" |
33 | #include "Interpreter.h" |
34 | #include "JSFunction.h" |
35 | |
36 | namespace JSC { |
37 | |
38 | ASSERT_CLASS_FITS_IN_CELL(JSActivation); |
39 | |
40 | const ClassInfo JSActivation::info = { .className: "JSActivation" , .parentClass: 0, .staticPropHashTable: 0, .classPropHashTableGetterFunction: 0 }; |
41 | |
42 | JSActivation::JSActivation(CallFrame* callFrame, NonNullPassRefPtr<FunctionExecutable> functionExecutable) |
43 | : Base(callFrame->globalData().activationStructure, new JSActivationData(functionExecutable, callFrame->registers())) |
44 | { |
45 | } |
46 | |
47 | JSActivation::~JSActivation() |
48 | { |
49 | delete d(); |
50 | } |
51 | |
52 | void 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 | |
71 | bool 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 | |
94 | void 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 |
109 | void 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 | |
124 | bool 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 | |
132 | JSObject* JSActivation::toThisObject(ExecState* exec) const |
133 | { |
134 | return exec->globalThisValue(); |
135 | } |
136 | |
137 | bool JSActivation::isDynamicScope() const |
138 | { |
139 | return d()->functionExecutable->usesEval(); |
140 | } |
141 | |
142 | JSValue 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 | |
167 | PropertySlot::GetValueFunc JSActivation::getArgumentsGetter() |
168 | { |
169 | return argumentsGetter; |
170 | } |
171 | |
172 | } // namespace JSC |
173 | |