runtime/JSBoundFunction.cpp

   1 /*
   2  * Copyright (C) 2011 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 "JSBoundFunction.h"
  28
  29 #include "GetterSetter.h"
  30 #include "JSGlobalObject.h"
  31
  32 namespace JSC {
  33
  34 ASSERT_CLASS_FITS_IN_CELL(JSBoundFunction);
  35 ASSERT_HAS_TRIVIAL_DESTRUCTOR(JSBoundFunction);
  36
  37 const ClassInfo JSBoundFunction::s_info = { "Function", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSBoundFunction) };
  38
  39 EncodedJSValue JSC_HOST_CALL boundFunctionCall(ExecState* exec)
  40 {
  41     JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->callee());
  42
  43     ASSERT(isJSArray(boundFunction->boundArgs())); // Currently this is true!
  44     JSArray* boundArgs = asArray(boundFunction->boundArgs());
  45
  46     MarkedArgumentBuffer args;
  47     for (unsigned i = 0; i < boundArgs->length(); ++i)
  48         args.append(boundArgs->getIndex(i));
  49     for (unsigned i = 0; i < exec->argumentCount(); ++i)
  50         args.append(exec->argument(i));
  51
  52     JSObject* targetFunction = boundFunction->targetFunction();
  53     CallData callData;
  54     CallType callType = getCallData(targetFunction, callData);
  55     ASSERT(callType != CallTypeNone);
  56     return JSValue::encode(call(exec, targetFunction, callType, callData, boundFunction->boundThis(), args));
  57 }
  58
  59 EncodedJSValue JSC_HOST_CALL boundFunctionConstruct(ExecState* exec)
  60 {
  61     JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->callee());
  62
  63     ASSERT(isJSArray(boundFunction->boundArgs())); // Currently this is true!
  64     JSArray* boundArgs = asArray(boundFunction->boundArgs());
  65
  66     MarkedArgumentBuffer args;
  67     for (unsigned i = 0; i < boundArgs->length(); ++i)
  68         args.append(boundArgs->getIndex(i));
  69     for (unsigned i = 0; i < exec->argumentCount(); ++i)
  70         args.append(exec->argument(i));
  71
  72     JSObject* targetFunction = boundFunction->targetFunction();
  73     ConstructData constructData;
  74     ConstructType constructType = getConstructData(targetFunction, constructData);
  75     ASSERT(constructType != ConstructTypeNone);
  76     return JSValue::encode(construct(exec, targetFunction, constructType, constructData, args));
  77 }
  78
  79 JSBoundFunction* JSBoundFunction::create(ExecState* exec, JSGlobalObject* globalObject, JSObject* targetFunction, JSValue boundThis, JSValue boundArgs, int length, const Identifier& name)
  80 {
  81     ConstructData constructData;
  82     ConstructType constructType = JSC::getConstructData(targetFunction, constructData);
  83     bool canConstruct = constructType != ConstructTypeNone;
  84
  85     NativeExecutable* executable = exec->globalData().getHostFunction(boundFunctionCall, canConstruct ? boundFunctionConstruct : callHostFunctionAsConstructor);
  86     JSBoundFunction* function = new (NotNull, allocateCell<JSBoundFunction>(*exec->heap())) JSBoundFunction(exec, globalObject, globalObject->boundFunctionStructure(), targetFunction, boundThis, boundArgs);
  87
  88     function->finishCreation(exec, executable, length, name);
  89     return function;
  90 }
  91
  92 bool JSBoundFunction::hasInstance(JSObject* object, ExecState* exec, JSValue value, JSValue)
  93 {
  94     JSBoundFunction* thisObject = jsCast<JSBoundFunction*>(object);
  95     // FIXME: our instanceof implementation will have already (incorrectly) performed
  96     // a [[Get]] of .prototype from the bound function object, which is incorrect!
  97     // https://bugs.webkit.org/show_bug.cgi?id=68656
  98     JSValue proto = thisObject->m_targetFunction->get(exec, exec->propertyNames().prototype);
  99     return thisObject->m_targetFunction->methodTable()->hasInstance(thisObject->m_targetFunction.get(), exec, value, proto);
 100 }
 101
 102 JSBoundFunction::JSBoundFunction(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, JSObject* targetFunction, JSValue boundThis, JSValue boundArgs)
 103     : Base(exec, globalObject, structure)
 104     , m_targetFunction(exec->globalData(), this, targetFunction)
 105     , m_boundThis(exec->globalData(), this, boundThis)
 106     , m_boundArgs(exec->globalData(), this, boundArgs)
 107 {
 108 }
 109
 110 void JSBoundFunction::finishCreation(ExecState* exec, NativeExecutable* executable, int length, const Identifier& name)
 111 {
 112     Base::finishCreation(exec, executable, length, name);
 113     ASSERT(inherits(&s_info));
 114
 115     putDirectAccessor(exec->globalData(), exec->propertyNames().arguments, globalObject()->throwTypeErrorGetterSetter(exec), DontDelete | DontEnum | Accessor);
 116     putDirectAccessor(exec->globalData(), exec->propertyNames().caller, globalObject()->throwTypeErrorGetterSetter(exec), DontDelete | DontEnum | Accessor);
 117 }
 118
 119 void JSBoundFunction::visitChildren(JSCell* cell, SlotVisitor& visitor)
 120 {
 121     JSBoundFunction* thisObject = jsCast<JSBoundFunction*>(cell);
 122     ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
 123     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
 124     ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
 125     Base::visitChildren(thisObject, visitor);
 126
 127     visitor.append(&thisObject->m_targetFunction);
 128     visitor.append(&thisObject->m_boundThis);
 129     visitor.append(&thisObject->m_boundArgs);
 130 }
 131
 132 } // namespace JSC