darling-JavaScriptCore/runtime/JSProxy.cpp

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#include "config.h"
#include "JSProxy.h"

#include "JSGlobalObject.h"
#include "JSCInlines.h"
#include "PrototypeMapInlines.h"

namespace JSC {

STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSProxy);

const ClassInfo JSProxy::s_info = { "JSProxy", &Base::s_info, 0, CREATE_METHOD_TABLE(JSProxy) };

void JSProxy::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
    JSProxy* thisObject = jsCast<JSProxy*>(cell);
    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
    Base::visitChildren(thisObject, visitor);
    visitor.append(thisObject->m_target);
}

void JSProxy::setTarget(VM& vm, JSGlobalObject* globalObject)
{
    ASSERT_ARG(globalObject, globalObject);
    JSGlobalObject* previousGlobalObject = jsCast<JSGlobalObject*>(m_target.get());

    m_target.set(vm, this, globalObject);
    setPrototypeDirect(vm, globalObject->getPrototypeDirect());

    PrototypeMap& prototypeMap = vm.prototypeMap;
    if (!prototypeMap.isPrototype(this))
        return;

    // previousGlobalObject cannot be null because in order for this JSProxy to be used as a prototype
    // of an object, we must have previously called setTarget() and associated it with a JSGlobalObject.
    RELEASE_ASSERT(previousGlobalObject);

    // This is slow but constant time. We think it's very rare for a proxy
    // to be a prototype, and reasonably rare to retarget a proxy,
    // so slow constant time is OK.
    for (size_t i = 0; i <= JSFinalObject::maxInlineCapacity(); ++i)
        prototypeMap.clearEmptyObjectStructureForPrototype(previousGlobalObject, this, i);
}

String JSProxy::className(const JSObject* object)
{
    const JSProxy* thisObject = jsCast<const JSProxy*>(object);
    return thisObject->target()->methodTable()->className(thisObject->target());
}

bool JSProxy::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
    JSProxy* thisObject = jsCast<JSProxy*>(object);
    return thisObject->target()->methodTable(exec->vm())->getOwnPropertySlot(thisObject->target(), exec, propertyName, slot);
}

bool JSProxy::getOwnPropertySlotByIndex(JSObject* object, ExecState* exec, unsigned propertyName, PropertySlot& slot)
{
    JSProxy* thisObject = jsCast<JSProxy*>(object);
    return thisObject->target()->methodTable(exec->vm())->getOwnPropertySlotByIndex(thisObject->target(), exec, propertyName, slot);
}

bool JSProxy::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
    JSProxy* thisObject = jsCast<JSProxy*>(cell);
    return thisObject->target()->methodTable(exec->vm())->put(thisObject->target(), exec, propertyName, value, slot);
}

bool JSProxy::putByIndex(JSCell* cell, ExecState* exec, unsigned propertyName, JSValue value, bool shouldThrow)
{
    JSProxy* thisObject = jsCast<JSProxy*>(cell);
    return thisObject->target()->methodTable(exec->vm())->putByIndex(thisObject->target(), exec, propertyName, value, shouldThrow);
}

bool JSProxy::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, const PropertyDescriptor& descriptor, bool shouldThrow)
{
    JSProxy* thisObject = jsCast<JSProxy*>(object);
    return thisObject->target()->methodTable(exec->vm())->defineOwnProperty(thisObject->target(), exec, propertyName, descriptor, shouldThrow);
}

bool JSProxy::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
{
    JSProxy* thisObject = jsCast<JSProxy*>(cell);
    return thisObject->target()->methodTable(exec->vm())->deleteProperty(thisObject->target(), exec, propertyName);
}

bool JSProxy::preventExtensions(JSObject* object, ExecState* exec)
{
    JSProxy* thisObject = jsCast<JSProxy*>(object);
    return thisObject->target()->methodTable(exec->vm())->preventExtensions(thisObject->target(), exec);
}

bool JSProxy::deletePropertyByIndex(JSCell* cell, ExecState* exec, unsigned propertyName)
{
    JSProxy* thisObject = jsCast<JSProxy*>(cell);
    return thisObject->target()->methodTable(exec->vm())->deletePropertyByIndex(thisObject->target(), exec, propertyName);
}

void JSProxy::getPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
    JSProxy* thisObject = jsCast<JSProxy*>(object);
    thisObject->target()->methodTable(exec->vm())->getPropertyNames(thisObject->target(), exec, propertyNames, mode);
}

uint32_t JSProxy::getEnumerableLength(ExecState* exec, JSObject* object)
{
    JSProxy* thisObject = jsCast<JSProxy*>(object);
    return thisObject->target()->methodTable(exec->vm())->getEnumerableLength(exec, thisObject->target());
}

void JSProxy::getStructurePropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode)
{
    // Skip the structure loop, since it is invalid for proxies.
}

void JSProxy::getGenericPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
    JSProxy* thisObject = jsCast<JSProxy*>(object);
    // Get *all* of the property names, not just the generic ones, since we skipped the structure
    // ones above.
    thisObject->target()->methodTable(exec->vm())->getPropertyNames(thisObject->target(), exec, propertyNames, mode);
}

void JSProxy::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
    JSProxy* thisObject = jsCast<JSProxy*>(object);
    thisObject->target()->methodTable(exec->vm())->getOwnPropertyNames(thisObject->target(), exec, propertyNames, mode);
}

bool JSProxy::setPrototype(JSObject*, ExecState* exec, JSValue, bool shouldThrowIfCantSet)
{
    auto scope = DECLARE_THROW_SCOPE(exec->vm());

    return typeError(exec, scope, shouldThrowIfCantSet, ASCIILiteral("Cannot set prototype of this object"));
}

JSValue JSProxy::getPrototype(JSObject* object, ExecState* exec)
{
    JSProxy* thisObject = jsCast<JSProxy*>(object);
    return thisObject->target()->methodTable(exec->vm())->getPrototype(thisObject->target(), exec);
}

} // namespace JSC