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/*
* Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2004-2023 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 "JSBoundFunction.h"
#include "JSCInlines.h"
#include "ProxyObject.h"
namespace JSC {
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(InternalFunction);
const ClassInfo InternalFunction::s_info = { "Function"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(InternalFunction) };
InternalFunction::InternalFunction(VM& vm, Structure* structure, NativeFunction functionForCall, NativeFunction functionForConstruct)
: Base(vm, structure)
, m_functionForCall(toTagged(functionForCall))
, m_functionForConstruct(functionForConstruct ? toTagged(functionForConstruct) : callHostFunctionAsConstructor)
, m_globalObject(structure->globalObject(), WriteBarrierEarlyInit)
{
ASSERT_WITH_MESSAGE(m_functionForCall, "[[Call]] must be implemented");
ASSERT(m_functionForConstruct);
ASSERT(jsDynamicCast<InternalFunction*>(this));
// JSCell::{getCallData,getConstructData} relies on the following conditions.
ASSERT(methodTable()->getCallData == InternalFunction::info()->methodTable.getCallData);
ASSERT(methodTable()->getConstructData == InternalFunction::info()->methodTable.getConstructData);
ASSERT(type() == InternalFunctionType || type() == NullSetterFunctionType);
}
void InternalFunction::finishCreation(VM& vm, unsigned length, const String& name, PropertyAdditionMode nameAdditionMode)
{
Base::finishCreation(vm);
JSString* nameString = jsString(vm, name);
m_originalName.set(vm, this, nameString);
// The enumeration order is length followed by name. So, we make sure to add the properties in that order.
if (nameAdditionMode == PropertyAdditionMode::WithStructureTransition) {
putDirect(vm, vm.propertyNames->length, jsNumber(length), PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum);
putDirect(vm, vm.propertyNames->name, nameString, PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum);
} else {
putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(length), PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum);
putDirectWithoutTransition(vm, vm.propertyNames->name, nameString, PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum);
}
}
template<typename Visitor>
void InternalFunction::visitChildrenImpl(JSCell* cell, Visitor& visitor)
{
InternalFunction* thisObject = jsCast<InternalFunction*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
visitor.append(thisObject->m_originalName);
}
DEFINE_VISIT_CHILDREN_WITH_MODIFIER(JS_EXPORT_PRIVATE, InternalFunction);
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;
}
String InternalFunction::displayName(VM& vm)
{
JSValue displayName = getDirect(vm, vm.propertyNames->displayName);
if (displayName && isJSString(displayName))
return asString(displayName)->tryGetValue();
return String();
}
CallData InternalFunction::getCallData(JSCell* cell)
{
// Keep this function OK for invocation from concurrent compilers.
auto* function = jsCast<InternalFunction*>(cell);
ASSERT(function->m_functionForCall);
CallData callData;
callData.type = CallData::Type::Native;
callData.native.function = function->m_functionForCall;
callData.native.isBoundFunction = false;
callData.native.isWasm = false;
return callData;
}
CallData InternalFunction::getConstructData(JSCell* cell)
{
// Keep this function OK for invocation from concurrent compilers.
CallData constructData;
auto* function = jsCast<InternalFunction*>(cell);
if (function->m_functionForConstruct != callHostFunctionAsConstructor) {
constructData.type = CallData::Type::Native;
constructData.native.function = function->m_functionForConstruct;
constructData.native.isBoundFunction = false;
constructData.native.isWasm = false;
}
return constructData;
}
String InternalFunction::calculatedDisplayName(VM& vm)
{
String explicitName = displayName(vm);
if (!explicitName.isEmpty())
return explicitName;
return name();
}
Structure* InternalFunction::createSubclassStructure(JSGlobalObject* globalObject, JSObject* newTarget, Structure* baseClass)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSGlobalObject* baseGlobalObject = baseClass->globalObject();
ASSERT(baseClass->hasMonoProto());
// newTarget may be an InternalFunction if we were called from Reflect.construct.
JSFunction* targetFunction = jsDynamicCast<JSFunction*>(newTarget);
if (UNLIKELY(!targetFunction || !targetFunction->canUseAllocationProfiles())) {
JSValue prototypeValue = newTarget->get(globalObject, vm.propertyNames->prototype);
RETURN_IF_EXCEPTION(scope, nullptr);
// .prototype getter could have triggered having a bad time so need to recheck array structures.
if (UNLIKELY(baseGlobalObject->isHavingABadTime())) {
if (baseGlobalObject->isOriginalArrayStructure(baseClass))
baseClass = baseGlobalObject->arrayStructureForIndexingTypeDuringAllocation(baseClass->indexingType());
}
if (JSObject* prototype = jsDynamicCast<JSObject*>(prototypeValue)) {
// This only happens if someone Reflect.constructs our builtin constructor with another builtin constructor or weird .prototype property on a
// JSFunction as the new.target. Thus, we don't care about the cost of looking up the structure from our hash table every time.
return baseGlobalObject->structureCache().emptyStructureForPrototypeFromBaseStructure(baseGlobalObject, prototype, baseClass);
}
return baseClass;
}
FunctionRareData* rareData = targetFunction->ensureRareData(vm);
Structure* structure = rareData->internalFunctionAllocationStructure();
if (LIKELY(structure && structure->classInfoForCells() == baseClass->classInfoForCells() && structure->globalObject() == baseGlobalObject))
return structure;
// .prototype can't be a getter if we canUseAllocationProfiles().
JSValue prototypeValue = targetFunction->get(globalObject, vm.propertyNames->prototype);
RETURN_IF_EXCEPTION(scope, nullptr);
if (JSObject* prototype = jsDynamicCast<JSObject*>(prototypeValue))
return rareData->createInternalFunctionAllocationStructureFromBase(vm, baseGlobalObject, prototype, baseClass);
return baseClass;
}
InternalFunction* InternalFunction::createFunctionThatMasqueradesAsUndefined(VM& vm, JSGlobalObject* globalObject, unsigned length, const String& name, NativeFunction nativeFunction)
{
Structure* structure = Structure::create(vm, globalObject, globalObject->objectPrototype(), TypeInfo(InternalFunctionType, InternalFunction::StructureFlags | MasqueradesAsUndefined), InternalFunction::info());
globalObject->masqueradesAsUndefinedWatchpointSet().fireAll(globalObject->vm(), "Allocated masquerading object");
InternalFunction* function = new (NotNull, allocateCell<InternalFunction>(vm)) InternalFunction(vm, structure, nativeFunction);
function->finishCreation(vm, length, name, PropertyAdditionMode::WithoutStructureTransition);
return function;
}
// https://tc39.es/ecma262/#sec-getfunctionrealm
JSGlobalObject* getFunctionRealm(JSGlobalObject* globalObject, JSObject* object)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
ASSERT(object->isCallable());
while (true) {
if (object->inherits<JSBoundFunction>()) {
object = jsCast<JSBoundFunction*>(object)->targetFunction();
continue;
}
if (object->inherits<JSRemoteFunction>()) {
object = jsCast<JSRemoteFunction*>(object)->targetFunction();
continue;
}
if (object->type() == ProxyObjectType) {
auto* proxy = jsCast<ProxyObject*>(object);
if (proxy->isRevoked()) {
throwTypeError(globalObject, scope, "Cannot get function realm from revoked Proxy"_s);
return nullptr;
}
object = proxy->target();
continue;
}
return object->globalObject();
}
}
} // namespace JSC
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