1/*
2 * Copyright (C) 2015-2017 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 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "CagedBarrierPtr.h"
29#include "JSObject.h"
30
31namespace JSC {
32
33// This is a mixin for the two kinds of Arguments-class objects that arise when you say
34// "arguments" inside a function. This class doesn't show up in the JSCell inheritance hierarchy.
35template<typename Type>
36class GenericArguments : public JSNonFinalObject {
37public:
38 typedef JSNonFinalObject Base;
39 static const unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | InterceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero | OverridesGetPropertyNames;
40
41protected:
42 GenericArguments(VM& vm, Structure* structure)
43 : Base(vm, structure)
44 {
45 }
46
47 static void visitChildren(JSCell*, SlotVisitor&);
48 static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
49 static bool getOwnPropertySlotByIndex(JSObject*, ExecState*, unsigned propertyName, PropertySlot&);
50 static void getOwnPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
51 static bool put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
52 static bool putByIndex(JSCell*, ExecState*, unsigned propertyName, JSValue, bool shouldThrow);
53 static bool deleteProperty(JSCell*, ExecState*, PropertyName);
54 static bool deletePropertyByIndex(JSCell*, ExecState*, unsigned propertyName);
55 static bool defineOwnProperty(JSObject*, ExecState*, PropertyName, const PropertyDescriptor&, bool shouldThrow);
56
57 void initModifiedArgumentsDescriptor(VM&, unsigned length);
58 void initModifiedArgumentsDescriptorIfNecessary(VM&, unsigned length);
59 void setModifiedArgumentDescriptor(VM&, unsigned index, unsigned length);
60 bool isModifiedArgumentDescriptor(unsigned index, unsigned length);
61
62 void copyToArguments(ExecState*, VirtualRegister firstElementDest, unsigned offset, unsigned length);
63
64 using ModifiedArgumentsPtr = CagedBarrierPtr<Gigacage::Primitive, bool>;
65 ModifiedArgumentsPtr m_modifiedArgumentsDescriptor;
66};
67
68} // namespace JSC
69