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/*
* Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2004, 2007-2008, 2016-2017 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* 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 {
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(InternalFunction);
const ClassInfo InternalFunction::s_info = { "Function", &Base::s_info, 0, CREATE_METHOD_TABLE(InternalFunction) };
InternalFunction::InternalFunction(VM& vm, Structure* structure)
: JSDestructibleObject(vm, structure)
{
// exec->vm() wants callees to not be large allocations.
RELEASE_ASSERT(!isLargeAllocation());
}
void InternalFunction::finishCreation(VM& vm, const String& name)
{
Base::finishCreation(vm);
ASSERT(inherits(vm, info()));
ASSERT(methodTable()->getCallData != InternalFunction::info()->methodTable.getCallData);
JSString* nameString = jsString(&vm, name);
m_originalName.set(vm, this, nameString);
putDirect(vm, vm.propertyNames->name, nameString, ReadOnly | DontEnum);
}
void InternalFunction::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
InternalFunction* thisObject = jsCast<InternalFunction*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
visitor.append(thisObject->m_originalName);
}
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*, CallData&)
{
RELEASE_ASSERT_NOT_REACHED();
return CallType::None;
}
const String InternalFunction::calculatedDisplayName(VM& vm)
{
const String explicitName = displayName(vm);
if (!explicitName.isEmpty())
return explicitName;
return name();
}
Structure* InternalFunction::createSubclassStructure(ExecState* exec, JSValue newTarget, Structure* baseClass)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// We allow newTarget == JSValue() because the API needs to be able to create classes without having a real JS frame.
// Since we don't allow subclassing in the API we just treat newTarget == JSValue() as newTarget == exec->jsCallee()
ASSERT(!newTarget || newTarget.isConstructor());
if (newTarget && newTarget != exec->jsCallee()) {
// newTarget may be an InternalFunction if we were called from Reflect.construct.
JSFunction* targetFunction = jsDynamicCast<JSFunction*>(vm, newTarget);
JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
if (LIKELY(targetFunction)) {
Structure* structure = targetFunction->rareData(vm)->internalFunctionAllocationStructure();
if (LIKELY(structure && structure->classInfo() == baseClass->classInfo()))
return structure;
// Note, Reflect.construct might cause the profile to churn but we don't care.
JSValue prototypeValue = newTarget.get(exec, exec->propertyNames().prototype);
RETURN_IF_EXCEPTION(scope, nullptr);
if (JSObject* prototype = jsDynamicCast<JSObject*>(vm, prototypeValue))
return targetFunction->rareData(vm)->createInternalFunctionAllocationStructureFromBase(vm, lexicalGlobalObject, prototype, baseClass);
} else {
JSValue prototypeValue = newTarget.get(exec, exec->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 new.target.
// Thus, we don't care about the cost of looking up the structure from our hash table every time.
return vm.prototypeMap.emptyStructureForPrototypeFromBaseStructure(lexicalGlobalObject, prototype, baseClass);
}
}
}
return baseClass;
}
} // namespace JSC
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