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 = { "JSActivation", 0, 0, 0 };
41
JSActivation(CallFrame * callFrame,NonNullPassRefPtr<FunctionExecutable> functionExecutable)42 JSActivation::JSActivation(CallFrame* callFrame, NonNullPassRefPtr<FunctionExecutable> functionExecutable)
43 : Base(callFrame->globalData().activationStructure, new JSActivationData(functionExecutable, callFrame->registers()))
44 {
45 }
46
~JSActivation()47 JSActivation::~JSActivation()
48 {
49 delete d();
50 }
51
markChildren(MarkStack & markStack)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(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(registerArray + count + RegisterFile::CallFrameHeaderSize, numVars, MayContainNullValues);
69 }
70
getOwnPropertySlot(ExecState * exec,const Identifier & propertyName,PropertySlot & slot)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(this, 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
put(ExecState *,const Identifier & propertyName,JSValue value,PutPropertySlot & slot)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, 0, true, slot);
106 }
107
108 // FIXME: Make this function honor ReadOnly (const) and DontEnum
putWithAttributes(ExecState * exec,const Identifier & propertyName,JSValue value,unsigned attributes)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, true, slot);
122 }
123
deleteProperty(ExecState * exec,const Identifier & propertyName)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
toThisObject(ExecState * exec) const132 JSObject* JSActivation::toThisObject(ExecState* exec) const
133 {
134 return exec->globalThisValue();
135 }
136
isDynamicScope() const137 bool JSActivation::isDynamicScope() const
138 {
139 return d()->functionExecutable->usesEval();
140 }
141
argumentsGetter(ExecState * exec,const Identifier &,const PropertySlot & slot)142 JSValue JSActivation::argumentsGetter(ExecState* exec, const Identifier&, const PropertySlot& slot)
143 {
144 JSActivation* activation = asActivation(slot.slotBase());
145
146 if (activation->d()->functionExecutable->usesArguments()) {
147 PropertySlot slot;
148 activation->symbolTableGet(exec->propertyNames().arguments, slot);
149 return slot.getValue(exec, exec->propertyNames().arguments);
150 }
151
152 CallFrame* callFrame = CallFrame::create(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
getArgumentsGetter()167 PropertySlot::GetValueFunc JSActivation::getArgumentsGetter()
168 {
169 return argumentsGetter;
170 }
171
172 } // namespace JSC
173