Source/JavaScriptCore/runtime/JSCustomGetterFunction.cpp

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#include "config.h"
#include "JSCustomGetterFunction.h"

#include "IdentifierInlines.h"
#include "JSCJSValueInlines.h"

namespace JSC {

const ClassInfo JSCustomGetterFunction::s_info = { "Function", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSCustomGetterFunction) };
static JSC_DECLARE_HOST_FUNCTION(customGetterFunctionCall);

JSC_DEFINE_HOST_FUNCTION(customGetterFunctionCall, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
    VM& vm = globalObject->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    JSCustomGetterFunction* customGetterFunction = jsCast<JSCustomGetterFunction*>(callFrame->jsCallee());
    JSValue thisValue = callFrame->thisValue();
    auto getter = customGetterFunction->getter();

    if (auto domAttribute = customGetterFunction->domAttribute()) {
        if (!thisValue.inherits(vm, domAttribute->classInfo))
            return throwVMDOMAttributeGetterTypeError(globalObject, scope, domAttribute->classInfo, customGetterFunction->propertyName());
    }

    RELEASE_AND_RETURN(scope, getter(globalObject, JSValue::encode(thisValue), customGetterFunction->propertyName()));
}

JSCustomGetterFunction::JSCustomGetterFunction(VM& vm, NativeExecutable* executable, JSGlobalObject* globalObject, Structure* structure, const PropertyName& propertyName, CustomFunctionPointer getter, std::optional<DOMAttributeAnnotation> domAttribute)
    : Base(vm, executable, globalObject, structure)
    , m_propertyName(Identifier::fromUid(vm, propertyName.uid()))
    , m_getter(getter)
    , m_domAttribute(domAttribute)
{
}

JSCustomGetterFunction* JSCustomGetterFunction::create(VM& vm, JSGlobalObject* globalObject, const PropertyName& propertyName, CustomFunctionPointer getter, std::optional<DOMAttributeAnnotation> domAttribute)
{
    ASSERT(getter);
    NativeExecutable* executable = vm.getHostFunction(customGetterFunctionCall, callHostFunctionAsConstructor, String(propertyName.publicName()));
    Structure* structure = globalObject->customGetterFunctionStructure();
    JSCustomGetterFunction* function = new (NotNull, allocateCell<JSCustomGetterFunction>(vm)) JSCustomGetterFunction(vm, executable, globalObject, structure, propertyName, getter, domAttribute);

    // Can't do this during initialization because getHostFunction might do a GC allocation.
    auto name = makeString("get ", propertyName.publicName());
    function->finishCreation(vm, executable, 0, name);
    return function;
}

void JSCustomGetterFunction::destroy(JSCell* cell)
{
    static_cast<JSCustomGetterFunction*>(cell)->~JSCustomGetterFunction();
}

} // namespace JSC