Source/WebCore/bindings/js/JSCallbackData.cpp

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#include "config.h"
#include "JSCallbackData.h"

#include "Document.h"
#include "JSDOMBinding.h"
#include "JSExecState.h"
#include "JSExecStateInstrumentation.h"
#include <JavaScriptCore/Exception.h>

namespace WebCore {
using namespace JSC;

JSValue JSCallbackData::invokeCallback(JSDOMGlobalObject& globalObject, JSObject* callback, JSValue thisValue, MarkedArgumentBuffer& args, CallbackType method, PropertyName functionName, NakedPtr<JSC::Exception>& returnedException)
{
    ASSERT(callback);

    ExecState* exec = globalObject.globalExec();
    VM& vm = exec->vm();
    auto scope = DECLARE_CATCH_SCOPE(vm);

    JSValue function;
    CallData callData;
    CallType callType = CallType::None;

    if (method != CallbackType::Object) {
        function = callback;
        callType = callback->methodTable(vm)->getCallData(callback, callData);
    }
    if (callType == CallType::None) {
        if (method == CallbackType::Function) {
            returnedException = JSC::Exception::create(vm, createTypeError(exec));
            return JSValue();
        }

        ASSERT(!functionName.isNull());
        function = callback->get(exec, functionName);
        if (UNLIKELY(scope.exception())) {
            returnedException = scope.exception();
            scope.clearException();
            return JSValue();
        }

        callType = getCallData(vm, function, callData);
        if (callType == CallType::None) {
            returnedException = JSC::Exception::create(vm, createTypeError(exec));
            return JSValue();
        }
    }

    ASSERT(!function.isEmpty());
    ASSERT(callType != CallType::None);

    ScriptExecutionContext* context = globalObject.scriptExecutionContext();
    // We will fail to get the context if the frame has been detached.
    if (!context)
        return JSValue();

    JSExecState::instrumentFunctionCall(context, callType, callData);

    returnedException = nullptr;
    JSValue result = JSExecState::profiledCall(exec, JSC::ProfilingReason::Other, function, callType, callData, thisValue, args, returnedException);

    InspectorInstrumentation::didCallFunction(context);

    return result;
}

void JSCallbackDataWeak::visitJSFunction(JSC::SlotVisitor& vistor)
{
    vistor.append(m_callback);
}

bool JSCallbackDataWeak::WeakOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, SlotVisitor& visitor, const char** reason)
{
    if (UNLIKELY(reason))
        *reason = "Context is opaque root"; // FIXME: what is the context.
    return visitor.containsOpaqueRoot(context);
}

} // namespace WebCore