runtime/NullSetterFunction.cpp

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