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* Copyright (C) 1999-2002 Harri Porten (
* Copyright (C) 2001 Peter Kelly (
* Copyright (C) 2004-2019 Apple Inc. All rights reserved.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
#include "config.h"
#include "InternalFunction.h"
#include "FunctionPrototype.h"
#include "JSGlobalObject.h"
#include "JSString.h"
#include "JSCInlines.h"
namespace JSC {
const ClassInfo InternalFunction::s_info = { "Function", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(InternalFunction) };
InternalFunction::InternalFunction(VM& vm, Structure* structure, NativeFunction functionForCall, NativeFunction functionForConstruct)
: JSDestructibleObject(vm, structure)
, m_functionForCall(functionForCall)
, m_functionForConstruct(functionForConstruct ? functionForConstruct : callHostFunctionAsConstructor)
, m_globalObject(vm, this, structure->globalObject())
ASSERT_WITH_MESSAGE(m_functionForCall, "[[Call]] must be implemented");
void InternalFunction::finishCreation(VM& vm, const String& name, NameVisibility nameVisibility, NameAdditionMode nameAdditionMode)
ASSERT(jsDynamicCast<InternalFunction*>(vm, this));
ASSERT(methodTable(vm)->getCallData == InternalFunction::info()->methodTable.getCallData);
ASSERT(methodTable(vm)->getConstructData == InternalFunction::info()->methodTable.getConstructData);
ASSERT(type() == InternalFunctionType);
JSString* nameString = jsString(vm, name);
m_originalName.set(vm, this, nameString);
if (nameVisibility == NameVisibility::Visible) {
if (nameAdditionMode == NameAdditionMode::WithStructureTransition)
putDirect(vm, vm.propertyNames->name, nameString, PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum);
putDirectWithoutTransition(vm, vm.propertyNames->name, nameString, PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum);
void InternalFunction::visitChildren(JSCell* cell, SlotVisitor& visitor)
InternalFunction* thisObject = jsCast<InternalFunction*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
const String& InternalFunction::name()
const String& name = m_originalName->tryGetValue();
ASSERT(name); // m_originalName was built from a String, and hence, there is no rope to resolve.
return name;
const String InternalFunction::displayName(VM& vm)
JSValue displayName = getDirect(vm, vm.propertyNames->displayName);
if (displayName && isJSString(displayName))
return asString(displayName)->tryGetValue();
return String();
CallType InternalFunction::getCallData(JSCell* cell, CallData& callData)
auto* function = jsCast<InternalFunction*>(cell);
callData.native.function = function->m_functionForCall;
return CallType::Host;
ConstructType InternalFunction::getConstructData(JSCell* cell, ConstructData& constructData)
auto* function = jsCast<InternalFunction*>(cell);
if (function->m_functionForConstruct == callHostFunctionAsConstructor)
return ConstructType::None;
constructData.native.function = function->m_functionForConstruct;
return ConstructType::Host;
const String InternalFunction::calculatedDisplayName(VM& vm)
const String explicitName = displayName(vm);
if (!explicitName.isEmpty())
return explicitName;
return name();
Structure* InternalFunction::createSubclassStructureSlow(JSGlobalObject* globalObject, JSValue newTarget, Structure* baseClass)
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// newTarget may be an InternalFunction if we were called from Reflect.construct.
JSFunction* targetFunction = jsDynamicCast<JSFunction*>(vm, newTarget);
JSGlobalObject* baseGlobalObject = baseClass->globalObject();
if (LIKELY(targetFunction)) {
Structure* structure = targetFunction->rareData(vm)->internalFunctionAllocationStructure();
if (LIKELY(structure && structure->classInfo() == baseClass->classInfo() && structure->globalObject() == baseGlobalObject))
return structure;
// Note, Reflect.construct might cause the profile to churn but we don't care.
JSValue prototypeValue = targetFunction->get(globalObject, vm.propertyNames->prototype);
RETURN_IF_EXCEPTION(scope, nullptr);
if (JSObject* prototype = jsDynamicCast<JSObject*>(vm, prototypeValue))
return targetFunction->rareData(vm)->createInternalFunctionAllocationStructureFromBase(vm, baseGlobalObject, prototype, baseClass);
} else {
JSValue prototypeValue = newTarget.get(globalObject, vm.propertyNames->prototype);
RETURN_IF_EXCEPTION(scope, nullptr);
if (JSObject* prototype = jsDynamicCast<JSObject*>(vm, prototypeValue)) {
// This only happens if someone Reflect.constructs our builtin constructor with another builtin constructor as the
// Thus, we don't care about the cost of looking up the structure from our hash table every time.
return vm.structureCache.emptyStructureForPrototypeFromBaseStructure(baseGlobalObject, prototype, baseClass);
return baseClass;
} // namespace JSC