1/*
2 * Copyright (C) 2015-2016 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#include "config.h"
27#include "NullSetterFunction.h"
28
29#include "CodeBlock.h"
30#include "Error.h"
31#include "JSCInlines.h"
32#include "JSCJSValueInlines.h"
33#include "StackVisitor.h"
34
35namespace JSC {
36
37const ClassInfo NullSetterFunction::s_info = { "Function", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(NullSetterFunction) };
38
39
40class GetCallerStrictnessFunctor {
41public:
42 GetCallerStrictnessFunctor()
43 : m_iterations(0)
44 , m_callerIsStrict(false)
45 {
46 }
47
48 StackVisitor::Status operator()(StackVisitor& visitor) const
49 {
50 ++m_iterations;
51 if (m_iterations < 2)
52 return StackVisitor::Continue;
53
54 CodeBlock* codeBlock = visitor->codeBlock();
55 m_callerIsStrict = codeBlock && codeBlock->isStrictMode();
56 return StackVisitor::Done;
57 }
58
59 bool callerIsStrict() const { return m_callerIsStrict; }
60
61private:
62 mutable int m_iterations;
63 mutable bool m_callerIsStrict;
64};
65
66static bool callerIsStrict(ExecState* exec)
67{
68 GetCallerStrictnessFunctor iter;
69 exec->iterate(iter);
70 return iter.callerIsStrict();
71}
72
73namespace NullSetterFunctionInternal {
74static EncodedJSValue JSC_HOST_CALL callReturnUndefined(ExecState* exec)
75{
76 VM& vm = exec->vm();
77 auto scope = DECLARE_THROW_SCOPE(vm);
78
79 if (callerIsStrict(exec))
80 return JSValue::encode(throwTypeError(exec, scope, "Setting a property that has only a getter"_s));
81 return JSValue::encode(jsUndefined());
82}
83}
84
85NullSetterFunction::NullSetterFunction(VM& vm, Structure* structure)
86 : Base(vm, structure, NullSetterFunctionInternal::callReturnUndefined, nullptr)
87{
88}
89
90}
91