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 #include "JSCInlines.h"
  32
  33 namespace JSC {
  34
  35 const ClassInfo JSBoundFunction::s_info = { "Function", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSBoundFunction) };
  36
  37 EncodedJSValue JSC_HOST_CALL boundFunctionCall(ExecState* exec)
  38 {
  39     JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->callee());
  40
  41     ASSERT(isJSArray(boundFunction->boundArgs())); // Currently this is true!
  42     JSArray* boundArgs = asArray(boundFunction->boundArgs());
  43
  44     MarkedArgumentBuffer args;
  45     for (unsigned i = 0; i < boundArgs->length(); ++i)
  46         args.append(boundArgs->getIndexQuickly(i));
  47     for (unsigned i = 0; i < exec->argumentCount(); ++i)
  48         args.append(exec->uncheckedArgument(i));
  49
  50     JSObject* targetFunction = boundFunction->targetFunction();
  51     CallData callData;
  52     CallType callType = getCallData(targetFunction, callData);
  53     ASSERT(callType != CallTypeNone);
  54     return JSValue::encode(call(exec, targetFunction, callType, callData, boundFunction->boundThis(), args));
  55 }
  56
  57 EncodedJSValue JSC_HOST_CALL boundFunctionConstruct(ExecState* exec)
  58 {
  59     JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->callee());
  60
  61     ASSERT(isJSArray(boundFunction->boundArgs())); // Currently this is true!
  62     JSArray* boundArgs = asArray(boundFunction->boundArgs());
  63
  64     MarkedArgumentBuffer args;
  65     for (unsigned i = 0; i < boundArgs->length(); ++i)
  66         args.append(boundArgs->getIndexQuickly(i));
  67     for (unsigned i = 0; i < exec->argumentCount(); ++i)
  68         args.append(exec->uncheckedArgument(i));
  69
  70     JSObject* targetFunction = boundFunction->targetFunction();
  71     ConstructData constructData;
  72     ConstructType constructType = getConstructData(targetFunction, constructData);
  73     ASSERT(constructType != ConstructTypeNone);
  74     return JSValue::encode(construct(exec, targetFunction, constructType, constructData, args));
  75 }
  76
  77 JSBoundFunction* JSBoundFunction::create(VM& vm, JSGlobalObject* globalObject, JSObject* targetFunction, JSValue boundThis, JSValue boundArgs, int length, const String& name)
  78 {
  79     ConstructData constructData;
  80     ConstructType constructType = JSC::getConstructData(targetFunction, constructData);
  81     bool canConstruct = constructType != ConstructTypeNone;
  82     NativeExecutable* executable = vm.getHostFunction(boundFunctionCall, canConstruct ? boundFunctionConstruct : callHostFunctionAsConstructor);
  83     JSBoundFunction* function = new (NotNull, allocateCell<JSBoundFunction>(vm.heap)) JSBoundFunction(vm, globalObject, globalObject->boundFunctionStructure(), targetFunction, boundThis, boundArgs);
  84
  85     function->finishCreation(vm, executable, length, name);
  86     return function;
  87 }
  88
  89 void JSBoundFunction::destroy(JSCell* cell)
  90 {
  91     static_cast<JSBoundFunction*>(cell)->JSBoundFunction::~JSBoundFunction();
  92 }
  93
  94 bool JSBoundFunction::customHasInstance(JSObject* object, ExecState* exec, JSValue value)
  95 {
  96     return jsCast<JSBoundFunction*>(object)->m_targetFunction->hasInstance(exec, value);
  97 }
  98
  99 JSBoundFunction::JSBoundFunction(VM& vm, JSGlobalObject* globalObject, Structure* structure, JSObject* targetFunction, JSValue boundThis, JSValue boundArgs)
 100     : Base(vm, globalObject, structure)
 101     , m_targetFunction(vm, this, targetFunction)
 102     , m_boundThis(vm, this, boundThis)
 103     , m_boundArgs(vm, this, boundArgs)
 104 {
 105 }
 106
 107 void JSBoundFunction::finishCreation(VM& vm, NativeExecutable* executable, int length, const String& name)
 108 {
 109     Base::finishCreation(vm, executable, length, name);
 110     ASSERT(inherits(info()));
 111
 112     putDirectNonIndexAccessor(vm, vm.propertyNames->arguments, globalObject()->throwTypeErrorGetterSetter(vm), DontDelete | DontEnum | Accessor);
 113     putDirectNonIndexAccessor(vm, vm.propertyNames->caller, globalObject()->throwTypeErrorGetterSetter(vm), DontDelete | DontEnum | Accessor);
 114 }
 115
 116 void JSBoundFunction::visitChildren(JSCell* cell, SlotVisitor& visitor)
 117 {
 118     JSBoundFunction* thisObject = jsCast<JSBoundFunction*>(cell);
 119     ASSERT_GC_OBJECT_INHERITS(thisObject, info());
 120     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
 121     ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
 122     Base::visitChildren(thisObject, visitor);
 123
 124     visitor.append(&thisObject->m_targetFunction);
 125     visitor.append(&thisObject->m_boundThis);
 126     visitor.append(&thisObject->m_boundArgs);
 127 }
 128
 129 } // namespace JSC