ChakraCore/lib/Runtime/Debug/TTActionEvents.cpp

//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------
#include "RuntimeDebugPch.h"

#include "Library/JavascriptExceptionMetadata.h"

#if ENABLE_TTD

namespace TTD
{
    namespace NSLogEvents
    {
        bool IsJsRTActionRootCall(const EventLogEntry* evt)
        {
            if(evt->EventKind != NSLogEvents::EventKind::CallExistingFunctionActionTag)
            {
                return false;
            }

            const JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);
            return cfAction->CallbackDepth == 0;
        }

        int64 AccessTimeInRootCallOrSnapshot(const EventLogEntry* evt, bool& isSnap, bool& isRoot, bool& hasRtrSnap)
        {
            isSnap = false;
            isRoot = false;
            hasRtrSnap = false;

            if(evt->EventKind == NSLogEvents::EventKind::SnapshotTag)
            {
                const NSLogEvents::SnapshotEventLogEntry* snapEvent = NSLogEvents::GetInlineEventDataAs<NSLogEvents::SnapshotEventLogEntry, NSLogEvents::EventKind::SnapshotTag>(evt);

                isSnap = true;
                return snapEvent->RestoreTimestamp;
            }
            else if(NSLogEvents::IsJsRTActionRootCall(evt))
            {
                const NSLogEvents::JsRTCallFunctionAction* rootEntry = NSLogEvents::GetInlineEventDataAs<NSLogEvents::JsRTCallFunctionAction, NSLogEvents::EventKind::CallExistingFunctionActionTag>(evt);

                isRoot = true;
                hasRtrSnap = (rootEntry->AdditionalReplayInfo != nullptr && rootEntry->AdditionalReplayInfo->RtRSnap != nullptr);
                return rootEntry->CallEventTime;
            }
            else
            {
                return -1;
            }
        }

        bool TryGetTimeFromRootCallOrSnapshot(const EventLogEntry* evt, int64& res)
        {
            bool isSnap = false;
            bool isRoot = false;
            bool hasRtrSnap = false;

            res = AccessTimeInRootCallOrSnapshot(evt, isSnap, isRoot, hasRtrSnap);
            return (isSnap | isRoot);
        }

        int64 GetTimeFromRootCallOrSnapshot(const EventLogEntry* evt)
        {
            int64 res = -1;
            bool success = TryGetTimeFromRootCallOrSnapshot(evt, res);

            TTDAssert(success, "Not a root or snapshot!!!");
            return res;
        }

        void CreateScriptContext_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            const JsRTCreateScriptContextAction* cAction = GetInlineEventDataAs<JsRTCreateScriptContextAction, EventKind::CreateScriptContextActionTag>(evt);

            Js::ScriptContext* resCtx = nullptr;
            executeContext->TTDExternalObjectFunctions.pfCreateJsRTContextCallback(executeContext->GetRuntimeHandle(), &resCtx);
            TTDAssert(resCtx != nullptr, "Create failed");

            executeContext->AddRootRef_Replay(cAction->GlobalObject, resCtx->GetGlobalObject());
            resCtx->ScriptContextLogTag = cAction->GlobalObject;

            executeContext->AddRootRef_Replay(cAction->KnownObjects->UndefinedObject, resCtx->GetLibrary()->GetUndefined());
            executeContext->AddRootRef_Replay(cAction->KnownObjects->NullObject, resCtx->GetLibrary()->GetNull());
            executeContext->AddRootRef_Replay(cAction->KnownObjects->TrueObject, resCtx->GetLibrary()->GetTrue());
            executeContext->AddRootRef_Replay(cAction->KnownObjects->FalseObject, resCtx->GetLibrary()->GetFalse());
        }

        void CreateScriptContext_UnloadEventMemory(EventLogEntry* evt, UnlinkableSlabAllocator& alloc)
        {
            JsRTCreateScriptContextAction* cAction = GetInlineEventDataAs<JsRTCreateScriptContextAction, EventKind::CreateScriptContextActionTag>(evt);

            alloc.UnlinkAllocation(cAction->KnownObjects);
        }

        void CreateScriptContext_Emit(const EventLogEntry* evt, FileWriter* writer, ThreadContext* threadContext)
        {
            const JsRTCreateScriptContextAction* cAction = GetInlineEventDataAs<JsRTCreateScriptContextAction, EventKind::CreateScriptContextActionTag>(evt);

            writer->WriteSequenceStart_DefaultKey(NSTokens::Separator::CommaSeparator);
            writer->WriteLogTag(NSTokens::Key::logTag, cAction->GlobalObject, NSTokens::Separator::NoSeparator);
            writer->WriteLogTag(NSTokens::Key::logTag, cAction->KnownObjects->UndefinedObject, NSTokens::Separator::CommaSeparator);
            writer->WriteLogTag(NSTokens::Key::logTag, cAction->KnownObjects->NullObject, NSTokens::Separator::CommaSeparator);
            writer->WriteLogTag(NSTokens::Key::logTag, cAction->KnownObjects->TrueObject, NSTokens::Separator::CommaSeparator);
            writer->WriteLogTag(NSTokens::Key::logTag, cAction->KnownObjects->FalseObject, NSTokens::Separator::CommaSeparator);
            writer->WriteSequenceEnd();
        }

        void CreateScriptContext_Parse(EventLogEntry* evt, ThreadContext* threadContext, FileReader* reader, UnlinkableSlabAllocator& alloc)
        {
            JsRTCreateScriptContextAction* cAction = GetInlineEventDataAs<JsRTCreateScriptContextAction, EventKind::CreateScriptContextActionTag>(evt);
            cAction->KnownObjects = alloc.SlabAllocateStruct<JsRTCreateScriptContextAction_KnownObjects>();

            reader->ReadSequenceStart_WDefaultKey(true);
            cAction->GlobalObject = reader->ReadLogTag(NSTokens::Key::logTag, false);
            cAction->KnownObjects->UndefinedObject = reader->ReadLogTag(NSTokens::Key::logTag, true);
            cAction->KnownObjects->NullObject = reader->ReadLogTag(NSTokens::Key::logTag, true);
            cAction->KnownObjects->TrueObject = reader->ReadLogTag(NSTokens::Key::logTag, true);
            cAction->KnownObjects->FalseObject = reader->ReadLogTag(NSTokens::Key::logTag, true);
            reader->ReadSequenceEnd();
        }

        void SetActiveScriptContext_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::SetActiveScriptContextActionTag>(evt);
            Js::Var gvar = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTDAssert(gvar == nullptr || Js::GlobalObject::Is(gvar), "Something is not right here!");

            Js::GlobalObject* gobj = static_cast<Js::GlobalObject*>(gvar);
            Js::ScriptContext* newCtx = (gobj != nullptr) ? gobj->GetScriptContext() : nullptr;

            executeContext->TTDExternalObjectFunctions.pfSetActiveJsRTContext(executeContext->GetRuntimeHandle(), newCtx);
        }

#if !INT32VAR
        void CreateInt_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTIntegralArgumentAction* action = GetInlineEventDataAs<JsRTIntegralArgumentAction, EventKind::CreateIntegerActionTag>(evt);

            Js::Var res = Js::JavascriptNumber::ToVar((int32)action->Scalar, ctx);

            JsRTActionHandleResultForReplay<JsRTIntegralArgumentAction, EventKind::CreateIntegerActionTag>(executeContext, evt, res);
        }
#endif

        void CreateNumber_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTDoubleArgumentAction* action = GetInlineEventDataAs<JsRTDoubleArgumentAction, EventKind::CreateNumberActionTag>(evt);

            Js::Var res = Js::JavascriptNumber::ToVarNoCheck(action->DoubleValue, ctx);

            JsRTActionHandleResultForReplay<JsRTDoubleArgumentAction, EventKind::CreateNumberActionTag>(executeContext, evt, res);
        }

        void CreateBoolean_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTIntegralArgumentAction* action = GetInlineEventDataAs<JsRTIntegralArgumentAction, EventKind::CreateBooleanActionTag>(evt);

            Js::Var res = action->Scalar ? ctx->GetLibrary()->GetTrue() : ctx->GetLibrary()->GetFalse();

            JsRTActionHandleResultForReplay<JsRTIntegralArgumentAction, EventKind::CreateBooleanActionTag>(executeContext, evt, res);
        }

        void CreateString_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTStringArgumentAction* action = GetInlineEventDataAs<JsRTStringArgumentAction, EventKind::CreateStringActionTag>(evt);

            Js::Var res = Js::JavascriptString::NewCopyBuffer(action->StringValue.Contents, action->StringValue.Length, ctx);

            JsRTActionHandleResultForReplay<JsRTStringArgumentAction, EventKind::CreateStringActionTag>(executeContext, evt, res);
        }

        void CreateSymbol_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::CreateSymbolActionTag>(evt);
            Js::Var description = InflateVarInReplay(executeContext, GetVarItem_0(action));

            Js::JavascriptString* descriptionString;
            if(description != nullptr)
            {
                TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(description, ctx);
                descriptionString = Js::JavascriptConversion::ToString(description, ctx);
            }
            else
            {
                descriptionString = ctx->GetLibrary()->GetEmptyString();
            }
            Js::Var res = ctx->GetLibrary()->CreateSymbol(descriptionString);

            JsRTActionHandleResultForReplay<JsRTSingleVarArgumentAction, EventKind::CreateSymbolActionTag>(executeContext, evt, res);
        }

        void Execute_CreateErrorHelper(const JsRTSingleVarArgumentAction* errorData, ThreadContextTTD* executeContext, Js::ScriptContext* ctx, EventKind eventKind, Js::Var* res)
        {
            Js::Var message = InflateVarInReplay(executeContext, GetVarItem_0(errorData));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(message, ctx);

            *res = nullptr; 
            switch(eventKind)
            {
            case EventKind::CreateErrorActionTag:
                *res = ctx->GetLibrary()->CreateError();
                break;
            case EventKind::CreateRangeErrorActionTag:
                *res = ctx->GetLibrary()->CreateRangeError();
                break;
            case EventKind::CreateReferenceErrorActionTag:
                *res = ctx->GetLibrary()->CreateReferenceError();
                break;
            case EventKind::CreateSyntaxErrorActionTag:
                *res = ctx->GetLibrary()->CreateSyntaxError();
                break;
            case EventKind::CreateTypeErrorActionTag:
                *res = ctx->GetLibrary()->CreateTypeError();
                break;
            case EventKind::CreateURIErrorActionTag:
                *res = ctx->GetLibrary()->CreateURIError();
                break;
            default:
                TTDAssert(false, "Missing error kind!!!");
            }

            Js::JavascriptOperators::OP_SetProperty(*res, Js::PropertyIds::message, message, ctx);
        }

        void VarConvertToNumber_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::VarConvertToNumberActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(var, ctx);

            Js::Var res = Js::JavascriptOperators::ToNumber(var, ctx);

            JsRTActionHandleResultForReplay<JsRTSingleVarArgumentAction, EventKind::VarConvertToNumberActionTag>(executeContext, evt, res);
        }

        void VarConvertToBoolean_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::VarConvertToBooleanActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(var, ctx);

            Js::JavascriptConversion::ToBool(var, ctx) ? ctx->GetLibrary()->GetTrue() : ctx->GetLibrary()->GetFalse();

            //It is either true or false which we always track so no need to do result mapping
        }

        void VarConvertToString_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::VarConvertToStringActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(var, ctx);

            Js::Var res = Js::JavascriptConversion::ToString(var, ctx);

            JsRTActionHandleResultForReplay<JsRTSingleVarArgumentAction, EventKind::VarConvertToStringActionTag>(executeContext, evt, res);
        }

        void VarConvertToObject_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::VarConvertToObjectActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(var, ctx);

            Js::Var res = Js::JavascriptOperators::ToObject(var, ctx);
            Assert(res == nullptr || !Js::CrossSite::NeedMarshalVar(res, ctx));

            JsRTActionHandleResultForReplay<JsRTSingleVarArgumentAction, EventKind::VarConvertToObjectActionTag>(executeContext, evt, res);
        }

        void AddRootRef_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::AddRootRefActionTag>(evt);

            TTD_LOG_PTR_ID origId = reinterpret_cast<TTD_LOG_PTR_ID>(GetVarItem_0(action));

            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            Js::RecyclableObject* newObj = Js::RecyclableObject::FromVar(var);

            executeContext->AddRootRef_Replay(origId, newObj);
        }

        void AddWeakRootRef_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::AddWeakRootRefActionTag>(evt);

            TTD_LOG_PTR_ID origId = reinterpret_cast<TTD_LOG_PTR_ID>(GetVarItem_0(action));

            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            Js::RecyclableObject* newObj = Js::RecyclableObject::FromVar(var);

            executeContext->AddRootRef_Replay(origId, newObj);
        }

        void AllocateObject_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            Js::RecyclableObject* res = ctx->GetLibrary()->CreateObject();

            JsRTActionHandleResultForReplay<JsRTResultOnlyAction, EventKind::AllocateObjectActionTag>(executeContext, evt, res);
        }

        void AllocateExternalObject_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);

            Js::Var res = nullptr;
            executeContext->TTDExternalObjectFunctions.pfCreateExternalObject(ctx, &res);

            JsRTActionHandleResultForReplay<JsRTResultOnlyAction, EventKind::AllocateExternalObjectActionTag>(executeContext, evt, res);
        }

        void AllocateArrayAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTIntegralArgumentAction* action = GetInlineEventDataAs<JsRTIntegralArgumentAction, EventKind::AllocateArrayActionTag>(evt);

            Js::Var res = ctx->GetLibrary()->CreateArray((uint32)action->Scalar);

            JsRTActionHandleResultForReplay<JsRTIntegralArgumentAction, EventKind::AllocateArrayActionTag>(executeContext, evt, res);
        }

        void AllocateArrayBufferAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTIntegralArgumentAction* action = GetInlineEventDataAs<JsRTIntegralArgumentAction, EventKind::AllocateArrayBufferActionTag>(evt);

            Js::ArrayBuffer* abuff = ctx->GetLibrary()->CreateArrayBuffer((uint32)action->Scalar);
            TTDAssert(abuff->GetByteLength() == (uint32)action->Scalar, "Something is wrong with our sizes.");

            JsRTActionHandleResultForReplay<JsRTIntegralArgumentAction, EventKind::AllocateArrayBufferActionTag>(executeContext, evt, (Js::Var)abuff);
        }

        void AllocateExternalArrayBufferAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTByteBufferAction* action = GetInlineEventDataAs<JsRTByteBufferAction, EventKind::AllocateExternalArrayBufferActionTag>(evt);

            Js::ArrayBuffer* abuff = ctx->GetLibrary()->CreateArrayBuffer(action->Length);
            TTDAssert(abuff->GetByteLength() == action->Length, "Something is wrong with our sizes.");

            if(action->Length != 0)
            {
                js_memcpy_s(abuff->GetBuffer(), abuff->GetByteLength(), action->Buffer, action->Length);
            }

            JsRTActionHandleResultForReplay<JsRTByteBufferAction, EventKind::AllocateExternalArrayBufferActionTag>(executeContext, evt, (Js::Var)abuff);
        }

        void AllocateFunctionAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarScalarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarScalarArgumentAction, EventKind::AllocateFunctionActionTag>(evt);

            Js::Var res = nullptr;
            if(!GetScalarItem_0(action))
            {
                res = ctx->GetLibrary()->CreateStdCallExternalFunction(&Js::JavascriptExternalFunction::TTDReplayDummyExternalMethod, 0, nullptr);
            }
            else
            {
                Js::Var nameVar = InflateVarInReplay(executeContext, GetVarItem_0(action));
                TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(nameVar, ctx);

                Js::JavascriptString* name = nullptr;
                if(nameVar != nullptr)
                {
                    name = Js::JavascriptConversion::ToString(nameVar, ctx);
                }
                else
                {
                    name = ctx->GetLibrary()->GetEmptyString();
                }

                res = ctx->GetLibrary()->CreateStdCallExternalFunction(&Js::JavascriptExternalFunction::TTDReplayDummyExternalMethod, name, nullptr);
            }

            JsRTActionHandleResultForReplay<JsRTSingleVarScalarArgumentAction, EventKind::AllocateFunctionActionTag>(executeContext, evt, res);
        }

        void HostProcessExitAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            throw TTDebuggerAbortException::CreateAbortEndOfLog(_u("End of log reached with Host Process Exit -- returning to top-level."));
        }

        void GetAndClearExceptionWithMetadataAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);

            HRESULT hr = S_OK;
            Js::JavascriptExceptionObject *recordedException = nullptr;

            BEGIN_TRANSLATE_OOM_TO_HRESULT
                if (ctx->HasRecordedException())
                {
                    recordedException = ctx->GetAndClearRecordedException();
                }
            END_TRANSLATE_OOM_TO_HRESULT(hr)

            Js::Var exception = nullptr;
            if (recordedException != nullptr)
            {
                exception = recordedException->GetThrownObject(nullptr);
            }

            if (exception != nullptr)
            {
                Js::ScriptContext * scriptContext = executeContext->GetActiveScriptContext();
                Js::Var exceptionMetadata = Js::JavascriptExceptionMetadata::CreateMetadataVar(scriptContext);

                Js::FunctionBody *functionBody = recordedException->GetFunctionBody();

                Js::JavascriptOperators::OP_SetProperty(exceptionMetadata, Js::PropertyIds::exception, exception, scriptContext);

                if (functionBody == nullptr)
                {
                    // This is probably a parse error. We can get the error location metadata from the thrown object.
                    Js::JavascriptExceptionMetadata::PopulateMetadataFromCompileException(exceptionMetadata, exception, scriptContext);
                }
                else
                {
                    if (!Js::JavascriptExceptionMetadata::PopulateMetadataFromException(exceptionMetadata, recordedException, scriptContext))
                    {
                        return;
                    }
                }

                JsRTActionHandleResultForReplay<JsRTResultOnlyAction, EventKind::GetAndClearExceptionWithMetadataActionTag>(executeContext, evt, exceptionMetadata);
            }
        }

        void GetAndClearExceptionAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);

            HRESULT hr = S_OK;
            Js::JavascriptExceptionObject *recordedException = nullptr;

            BEGIN_TRANSLATE_OOM_TO_HRESULT
                if (ctx->HasRecordedException())
                {
                    recordedException = ctx->GetAndClearRecordedException();
                }
            END_TRANSLATE_OOM_TO_HRESULT(hr)

            Js::Var exception = nullptr;
            if(recordedException != nullptr)
            {
                exception = recordedException->GetThrownObject(nullptr);
            }

            if(exception != nullptr)
            {
                JsRTActionHandleResultForReplay<JsRTResultOnlyAction, EventKind::GetAndClearExceptionActionTag>(executeContext, evt, exception);
            }
        }

        void SetExceptionAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarScalarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarScalarArgumentAction, EventKind::SetExceptionActionTag>(evt);
            Js::Var exception = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(exception, ctx);

            bool propagateToDebugger = GetScalarItem_0(action) ? true : false;

            Js::JavascriptExceptionObject *exceptionObject;
            exceptionObject = RecyclerNew(ctx->GetRecycler(), Js::JavascriptExceptionObject, exception, ctx, nullptr);

            ctx->RecordException(exceptionObject, propagateToDebugger);
        }

        void HasPropertyAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarScalarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarScalarArgumentAction, EventKind::HasPropertyActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);

            //Result is not needed but trigger computation for any effects
            Js::JavascriptOperators::OP_HasProperty(var, GetPropertyIdItem(action), ctx);
        }

        void InstanceOfAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTDoubleVarArgumentAction* action = GetInlineEventDataAs<JsRTDoubleVarArgumentAction, EventKind::InstanceOfActionTag>(evt);
            Js::Var object = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(object, ctx);
            Js::Var constructor = InflateVarInReplay(executeContext, GetVarItem_1(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(constructor, ctx);

            //Result is not needed but trigger computation for any effects
            Js::RecyclableObject::FromVar(constructor)->HasInstance(object, ctx);
        }

        void EqualsAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTDoubleVarSingleScalarArgumentAction* action = GetInlineEventDataAs<JsRTDoubleVarSingleScalarArgumentAction, EventKind::EqualsActionTag>(evt);
            Js::Var object1 = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(object1, ctx);
            Js::Var object2 = InflateVarInReplay(executeContext, GetVarItem_1(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(object2, ctx);

            //Result is not needed but trigger computation for any effects
            if(GetScalarItem_0(action))
            {
                Js::JavascriptOperators::StrictEqual(object1, object2, ctx);
            }
            else
            {
                Js::JavascriptOperators::Equal(object1, object2, ctx);
            }
        }

        void GetPropertyIdFromSymbolAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::GetPropertyIdFromSymbolTag>(evt);
            Js::Var sym = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(sym, ctx);

            //These really don't have any effect, we need the marshal in validate, so just skip since Js::JavascriptSymbol has strange declaration order
            //
            //if(!Js::JavascriptSymbol::Is(sym))
            //{
            //    return JsErrorPropertyNotSymbol;
            //}
            //
            //Js::JavascriptSymbol::FromVar(symbol)->GetValue();
        }

        void GetPrototypeAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::GetPrototypeActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);

            Js::Var res = Js::JavascriptOperators::OP_GetPrototype(var,ctx);
            Assert(res == nullptr || !Js::CrossSite::NeedMarshalVar(res, ctx));

            JsRTActionHandleResultForReplay<JsRTSingleVarArgumentAction, EventKind::GetPrototypeActionTag>(executeContext, evt, res);
        }

        void GetPropertyAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarScalarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarScalarArgumentAction, EventKind::GetPropertyActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);

            Js::Var res = Js::JavascriptOperators::OP_GetProperty(var, GetPropertyIdItem(action), ctx);
            Assert(res == nullptr || !Js::CrossSite::NeedMarshalVar(res, ctx));

            JsRTActionHandleResultForReplay<JsRTSingleVarScalarArgumentAction, EventKind::GetPropertyActionTag>(executeContext, evt, res);
        }

        void GetIndexAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTDoubleVarArgumentAction* action = GetInlineEventDataAs<JsRTDoubleVarArgumentAction, EventKind::GetIndexActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);
            Js::Var index = InflateVarInReplay(executeContext, GetVarItem_1(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(index, ctx);

            Js::Var res = Js::JavascriptOperators::OP_GetElementI(var, index, ctx);

            JsRTActionHandleResultForReplay<JsRTDoubleVarArgumentAction, EventKind::GetIndexActionTag>(executeContext, evt, res);
        }

        void GetOwnPropertyInfoAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarScalarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarScalarArgumentAction, EventKind::GetOwnPropertyInfoActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);

            Js::Var res = nullptr;
            Js::PropertyDescriptor propertyDescriptorValue;
            if(Js::JavascriptOperators::GetOwnPropertyDescriptor(Js::RecyclableObject::FromVar(var), GetPropertyIdItem(action), ctx, &propertyDescriptorValue))
            {
                res = Js::JavascriptOperators::FromPropertyDescriptor(propertyDescriptorValue, ctx);
            }
            else
            {
                res = ctx->GetLibrary()->GetUndefined();
            }
            Assert(res == nullptr || !Js::CrossSite::NeedMarshalVar(res, ctx));

            JsRTActionHandleResultForReplay<JsRTSingleVarScalarArgumentAction, EventKind::GetOwnPropertyInfoActionTag>(executeContext, evt, res);
        }

        void GetOwnPropertyNamesInfoAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::GetOwnPropertyNamesInfoActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);

            Js::JavascriptArray* res = Js::JavascriptOperators::GetOwnPropertyNames(var, ctx);
            Assert(res == nullptr || !Js::CrossSite::NeedMarshalVar(res, ctx));

            JsRTActionHandleResultForReplay<JsRTSingleVarArgumentAction, EventKind::GetOwnPropertyNamesInfoActionTag>(executeContext, evt, res);
        }

        void GetOwnPropertySymbolsInfoAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::GetOwnPropertySymbolsInfoActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);

            Js::JavascriptArray* res = Js::JavascriptOperators::GetOwnPropertySymbols(var, ctx);
            Assert(res == nullptr || !Js::CrossSite::NeedMarshalVar(res, ctx));

            JsRTActionHandleResultForReplay<JsRTSingleVarArgumentAction, EventKind::GetOwnPropertySymbolsInfoActionTag>(executeContext, evt, res);
        }

        void DefinePropertyAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTDoubleVarSingleScalarArgumentAction* action = GetInlineEventDataAs<JsRTDoubleVarSingleScalarArgumentAction, EventKind::DefinePropertyActionTag>(evt);
            Js::Var object = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(object, ctx);
            Js::Var propertyDescriptor = InflateVarInReplay(executeContext, GetVarItem_1(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(propertyDescriptor, ctx);

            Js::PropertyDescriptor propertyDescriptorValue;
            Js::JavascriptOperators::ToPropertyDescriptor(propertyDescriptor, &propertyDescriptorValue, ctx);

            Js::JavascriptOperators::DefineOwnPropertyDescriptor(Js::RecyclableObject::FromVar(object), GetPropertyIdItem(action), propertyDescriptorValue, true, ctx);
        }

        void DeletePropertyAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTSingleVarDoubleScalarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarDoubleScalarArgumentAction, EventKind::DeletePropertyActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);

            Js::Var res = Js::JavascriptOperators::OP_DeleteProperty(var, GetPropertyIdItem(action), ctx, GetScalarItem_1(action) ? Js::PropertyOperation_StrictMode : Js::PropertyOperation_None);
            Assert(res == nullptr || !Js::CrossSite::NeedMarshalVar(res, ctx));

            JsRTActionHandleResultForReplay<JsRTSingleVarDoubleScalarArgumentAction, EventKind::DeletePropertyActionTag>(executeContext, evt, res);
        }

        void SetPrototypeAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTDoubleVarArgumentAction* action = GetInlineEventDataAs<JsRTDoubleVarArgumentAction, EventKind::SetPrototypeActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);
            Js::Var proto = InflateVarInReplay(executeContext, GetVarItem_1(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT_OR_NULL(proto, ctx);

            Js::JavascriptObject::ChangePrototype(Js::RecyclableObject::FromVar(var), Js::RecyclableObject::FromVar(proto), true, ctx);
        }

        void SetPropertyAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTDoubleVarDoubleScalarArgumentAction* action = GetInlineEventDataAs<JsRTDoubleVarDoubleScalarArgumentAction, EventKind::SetPropertyActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);
            Js::Var value = InflateVarInReplay(executeContext, GetVarItem_1(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(value, ctx);

            Js::JavascriptOperators::OP_SetProperty(var, GetPropertyIdItem(action), value, ctx, nullptr, GetScalarItem_1(action) ? Js::PropertyOperation_StrictMode : Js::PropertyOperation_None);
        }

        void SetIndexAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTTrippleVarArgumentAction* action = GetInlineEventDataAs<JsRTTrippleVarArgumentAction, EventKind::SetIndexActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));
            TTD_REPLAY_VALIDATE_INCOMING_OBJECT(var, ctx);
            Js::Var index = InflateVarInReplay(executeContext, GetVarItem_1(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(index, ctx);
            Js::Var value = InflateVarInReplay(executeContext, GetVarItem_2(action));
            TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(value, ctx);

            Js::JavascriptOperators::OP_SetElementI(var, index, value, ctx);
        }

        void GetTypedArrayInfoAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            const JsRTSingleVarArgumentAction* action = GetInlineEventDataAs<JsRTSingleVarArgumentAction, EventKind::GetTypedArrayInfoActionTag>(evt);
            Js::Var var = InflateVarInReplay(executeContext, GetVarItem_0(action));

            Js::TypedArrayBase* typedArrayBase = Js::TypedArrayBase::FromVar(var);
            Js::Var res = typedArrayBase->GetArrayBuffer();

            //Need additional notify since JsRTActionHandleResultForReplay may allocate but GetTypedArrayInfo does not enter runtime
            //Failure will kick all the way out to replay loop -- which is what we want
            AUTO_NESTED_HANDLED_EXCEPTION_TYPE(ExceptionType_OutOfMemory);
            JsRTActionHandleResultForReplay<JsRTSingleVarArgumentAction, EventKind::GetTypedArrayInfoActionTag>(executeContext, evt, res);
        }

        //////////////////

        void JsRTRawBufferCopyAction_Emit(const EventLogEntry* evt, FileWriter* writer, ThreadContext* threadContext)
        {
            const JsRTRawBufferCopyAction* rbcAction = GetInlineEventDataAs<JsRTRawBufferCopyAction, EventKind::RawBufferCopySync>(evt);

            writer->WriteKey(NSTokens::Key::argRetVal, NSTokens::Separator::CommaSeparator);
            NSSnapValues::EmitTTDVar(rbcAction->Dst, writer, NSTokens::Separator::NoSeparator);

            writer->WriteKey(NSTokens::Key::argRetVal, NSTokens::Separator::CommaSeparator);
            NSSnapValues::EmitTTDVar(rbcAction->Src, writer, NSTokens::Separator::NoSeparator);

            writer->WriteUInt32(NSTokens::Key::u32Val, rbcAction->DstIndx, NSTokens::Separator::CommaSeparator);
            writer->WriteUInt32(NSTokens::Key::u32Val, rbcAction->SrcIndx, NSTokens::Separator::CommaSeparator);
            writer->WriteUInt32(NSTokens::Key::u32Val, rbcAction->Count, NSTokens::Separator::CommaSeparator);
        }

        void JsRTRawBufferCopyAction_Parse(EventLogEntry* evt, ThreadContext* threadContext, FileReader* reader, UnlinkableSlabAllocator& alloc)
        {
            JsRTRawBufferCopyAction* rbcAction = GetInlineEventDataAs<JsRTRawBufferCopyAction, EventKind::RawBufferCopySync>(evt);

            reader->ReadKey(NSTokens::Key::argRetVal, true);
            rbcAction->Dst = NSSnapValues::ParseTTDVar(false, reader);

            reader->ReadKey(NSTokens::Key::argRetVal, true);
            rbcAction->Src = NSSnapValues::ParseTTDVar(false, reader);

            rbcAction->DstIndx = reader->ReadUInt32(NSTokens::Key::u32Val, true);
            rbcAction->SrcIndx = reader->ReadUInt32(NSTokens::Key::u32Val, true);
            rbcAction->Count = reader->ReadUInt32(NSTokens::Key::u32Val, true);
        }

        void RawBufferCopySync_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            const JsRTRawBufferCopyAction* action = GetInlineEventDataAs<JsRTRawBufferCopyAction, EventKind::RawBufferCopySync>(evt);
            Js::Var dst = InflateVarInReplay(executeContext, action->Dst); //never cross context
            Js::Var src = InflateVarInReplay(executeContext, action->Src); //never cross context

            TTDAssert(Js::ArrayBuffer::Is(dst) && Js::ArrayBuffer::Is(src), "Not array buffer objects!!!");
            TTDAssert(action->DstIndx + action->Count <= Js::ArrayBuffer::FromVar(dst)->GetByteLength(), "Copy off end of buffer!!!");
            TTDAssert(action->SrcIndx + action->Count <= Js::ArrayBuffer::FromVar(src)->GetByteLength(), "Copy off end of buffer!!!");

            byte* dstBuff = Js::ArrayBuffer::FromVar(dst)->GetBuffer() + action->DstIndx;
            byte* srcBuff = Js::ArrayBuffer::FromVar(src)->GetBuffer() + action->SrcIndx;

            //node uses mmove so we do too
            memmove(dstBuff, srcBuff, action->Count);
        }

        void RawBufferModifySync_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            const JsRTRawBufferModifyAction* action = GetInlineEventDataAs<JsRTRawBufferModifyAction, EventKind::RawBufferModifySync>(evt);
            Js::Var trgt = InflateVarInReplay(executeContext, action->Trgt); //never cross context

            TTDAssert(Js::ArrayBuffer::Is(trgt), "Not array buffer object!!!");
            TTDAssert(action->Index + action->Length <= Js::ArrayBuffer::FromVar(trgt)->GetByteLength(), "Copy off end of buffer!!!");

            byte* trgtBuff = Js::ArrayBuffer::FromVar(trgt)->GetBuffer() + action->Index;
            js_memcpy_s(trgtBuff, action->Length, action->Data, action->Length);
        }

        void RawBufferAsyncModificationRegister_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTRawBufferModifyAction* action = GetInlineEventDataAs<JsRTRawBufferModifyAction, EventKind::RawBufferAsyncModificationRegister>(evt);
            Js::Var trgt = InflateVarInReplay(executeContext, action->Trgt); //never cross context

            ctx->TTDContextInfo->AddToAsyncPendingList(Js::ArrayBuffer::FromVar(trgt), action->Index);
        }

        void RawBufferAsyncModifyComplete_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTRawBufferModifyAction* action = GetInlineEventDataAs<JsRTRawBufferModifyAction, EventKind::RawBufferAsyncModifyComplete>(evt);
            Js::Var trgt = InflateVarInReplay(executeContext, action->Trgt); //never cross context

            const Js::ArrayBuffer* dstBuff = Js::ArrayBuffer::FromVar(trgt);
            byte* copyBuff = dstBuff->GetBuffer() + action->Index;
            byte* finalModPos = dstBuff->GetBuffer() + action->Index + action->Length;

            TTDPendingAsyncBufferModification pendingAsyncInfo = { 0 };
            ctx->TTDContextInfo->GetFromAsyncPendingList(&pendingAsyncInfo, finalModPos);
            TTDAssert(dstBuff == pendingAsyncInfo.ArrayBufferVar && action->Index == pendingAsyncInfo.Index, "Something is not right.");

            js_memcpy_s(copyBuff, action->Length, action->Data, action->Length);
        }

        //////////////////

        void JsRTConstructCallAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTConstructCallAction* ccAction = GetInlineEventDataAs<JsRTConstructCallAction, EventKind::ConstructCallActionTag>(evt);

            Js::Var jsFunctionVar = InflateVarInReplay(executeContext, ccAction->ArgArray[0]);
            TTD_REPLAY_VALIDATE_INCOMING_FUNCTION(jsFunctionVar, ctx);

            //remove implicit constructor function as first arg in callInfo and argument loop below
            for(uint32 i = 1; i < ccAction->ArgCount; ++i)
            {
                 Js::Var argi = InflateVarInReplay(executeContext, ccAction->ArgArray[i]);
                 TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(argi, ctx);

                 ccAction->ExecArgs[i - 1] = argi;
            }

            Js::JavascriptFunction* jsFunction = Js::JavascriptFunction::FromVar(jsFunctionVar);
            Js::CallInfo callInfo(Js::CallFlags::CallFlags_New, (ushort)(ccAction->ArgCount - 1));
            Js::Arguments jsArgs(callInfo, ccAction->ExecArgs);

            //
            //TODO: we will want to look at this at some point -- either treat as "top-level" call or maybe constructors are fast so we can just jump back to previous "real" code
            //TTDAssert(!Js::ScriptFunction::Is(jsFunction) || execContext->GetThreadContext()->TTDRootNestingCount != 0, "This will cause user code to execute and we need to add support for that as a top-level call source!!!!");
            //

            Js::Var res = Js::JavascriptFunction::CallAsConstructor(jsFunction, /* overridingNewTarget = */nullptr, jsArgs, ctx);
            Assert(res == nullptr || !Js::CrossSite::NeedMarshalVar(res, ctx));

            JsRTActionHandleResultForReplay<JsRTConstructCallAction, EventKind::ConstructCallActionTag>(executeContext, evt, res);
        }

        void JsRTConstructCallAction_UnloadEventMemory(EventLogEntry* evt, UnlinkableSlabAllocator& alloc)
        {
            JsRTConstructCallAction* ccAction = GetInlineEventDataAs<JsRTConstructCallAction, EventKind::ConstructCallActionTag>(evt);

            if(ccAction->ArgArray != nullptr)
            {
                alloc.UnlinkAllocation(ccAction->ArgArray);
            }

            if(ccAction->ExecArgs != nullptr)
            {
                alloc.UnlinkAllocation(ccAction->ExecArgs);
            }
        }

        void JsRTConstructCallAction_Emit(const EventLogEntry* evt, FileWriter* writer, ThreadContext* threadContext)
        {
            const JsRTConstructCallAction* ccAction = GetInlineEventDataAs<JsRTConstructCallAction, EventKind::ConstructCallActionTag>(evt);

            writer->WriteKey(NSTokens::Key::argRetVal, NSTokens::Separator::CommaSeparator);
            NSSnapValues::EmitTTDVar(ccAction->Result, writer, NSTokens::Separator::NoSeparator);

            writer->WriteLengthValue(ccAction->ArgCount, NSTokens::Separator::CommaSeparator);
            writer->WriteSequenceStart_DefaultKey(NSTokens::Separator::CommaSeparator);
            for(uint32 i = 0; i < ccAction->ArgCount; ++i)
            {
                NSTokens::Separator sep = (i != 0) ? NSTokens::Separator::CommaSeparator : NSTokens::Separator::NoSeparator;
                NSSnapValues::EmitTTDVar(ccAction->ArgArray[i], writer, sep);
            }
            writer->WriteSequenceEnd();
        }

        void JsRTConstructCallAction_Parse(EventLogEntry* evt, ThreadContext* threadContext, FileReader* reader, UnlinkableSlabAllocator& alloc)
        {
            JsRTConstructCallAction* ccAction = GetInlineEventDataAs<JsRTConstructCallAction, EventKind::ConstructCallActionTag>(evt);

            reader->ReadKey(NSTokens::Key::argRetVal, true);
            ccAction->Result = NSSnapValues::ParseTTDVar(false, reader);

            ccAction->ArgCount = reader->ReadLengthValue(true);
            ccAction->ArgArray = alloc.SlabAllocateArray<TTDVar>(ccAction->ArgCount);

            reader->ReadSequenceStart_WDefaultKey(true);
            for(uint32 i = 0; i < ccAction->ArgCount; ++i)
            {
                ccAction->ArgArray[i] = NSSnapValues::ParseTTDVar(i != 0, reader);
            }
            reader->ReadSequenceEnd();

            ccAction->ExecArgs = (ccAction->ArgCount > 1) ? alloc.SlabAllocateArray<Js::Var>(ccAction->ArgCount - 1) : nullptr; //ArgCount includes slot for function which we don't use in exec
        }

        void JsRTCodeParseAction_SetBodyCtrId(EventLogEntry* parseEvent, uint32 bodyCtrId)
        {
            JsRTCodeParseAction* cpAction = GetInlineEventDataAs<JsRTCodeParseAction, EventKind::CodeParseActionTag>(parseEvent);
            cpAction->BodyCtrId = bodyCtrId;
        }

        void JsRTCodeParseAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);
            const JsRTCodeParseAction* cpAction = GetInlineEventDataAs<JsRTCodeParseAction, EventKind::CodeParseActionTag>(evt);

            Js::JavascriptFunction* function = nullptr;

            byte* script = cpAction->SourceCode;
            uint32 scriptByteLength = cpAction->SourceByteLength;

            TTDAssert(cpAction->IsUtf8 == ((cpAction->LoadFlag & LoadScriptFlag_Utf8Source) == LoadScriptFlag_Utf8Source), "Utf8 status is inconsistent!!!");

            SourceContextInfo * sourceContextInfo = ctx->GetSourceContextInfo((DWORD_PTR)cpAction->SourceContextId, nullptr);

            if(sourceContextInfo == nullptr)
            {
                const char16* srcUri = cpAction->SourceUri.Contents;
                uint32 srcUriLength = cpAction->SourceUri.Length;

                sourceContextInfo = ctx->CreateSourceContextInfo((DWORD_PTR)cpAction->SourceContextId, srcUri, srcUriLength, nullptr);
            }

            TTDAssert(cpAction->IsUtf8 || sizeof(wchar) == sizeof(char16), "Non-utf8 code only allowed on windows!!!");
            const int chsize = (cpAction->LoadFlag & LoadScriptFlag_Utf8Source) ? sizeof(char) : sizeof(char16);
            SRCINFO si = {
                /* sourceContextInfo   */ sourceContextInfo,
                /* dlnHost             */ 0,
                /* ulColumnHost        */ 0,
                /* lnMinHost           */ 0,
                /* ichMinHost          */ 0,
                /* ichLimHost          */ static_cast<ULONG>(scriptByteLength / chsize), // OK to truncate since this is used to limit sourceText in debugDocument/compilation errors.
                /* ulCharOffset        */ 0,
                /* mod                 */ kmodGlobal,
                /* grfsi               */ 0
            };

            Js::Utf8SourceInfo* utf8SourceInfo = nullptr;
            CompileScriptException se;
            function = ctx->LoadScript(script, scriptByteLength, &si, &se,
                &utf8SourceInfo, Js::Constants::GlobalCode, cpAction->LoadFlag, nullptr);

            TTDAssert(function != nullptr, "Something went wrong");

            Js::FunctionBody* fb = TTD::JsSupport::ForceAndGetFunctionBody(function->GetParseableFunctionInfo());

            ////
            //We don't do this automatically in the eval helper so do it here
            BEGIN_JS_RUNTIME_CALL(ctx);
            {
                ctx->TTDContextInfo->ProcessFunctionBodyOnLoad(fb, nullptr);
                ctx->TTDContextInfo->RegisterLoadedScript(fb, cpAction->BodyCtrId);

                fb->GetUtf8SourceInfo()->SetSourceInfoForDebugReplay_TTD(cpAction->BodyCtrId);
            }
            END_JS_RUNTIME_CALL(ctx);

            if(ctx->ShouldPerformDebuggerAction())
            {
                ctx->GetThreadContext()->TTDExecutionInfo->ProcessScriptLoad(ctx, cpAction->BodyCtrId, fb, utf8SourceInfo, &se);
            }
            ////

            JsRTActionHandleResultForReplay<JsRTCodeParseAction, EventKind::CodeParseActionTag>(executeContext, evt, (Js::Var)function);
        }

        void JsRTCodeParseAction_UnloadEventMemory(EventLogEntry* evt, UnlinkableSlabAllocator& alloc)
        {
            JsRTCodeParseAction* cpAction = GetInlineEventDataAs<JsRTCodeParseAction, EventKind::CodeParseActionTag>(evt);

            alloc.UnlinkAllocation(cpAction->SourceCode);

            if(!IsNullPtrTTString(cpAction->SourceUri))
            {
                alloc.UnlinkString(cpAction->SourceUri);
            }
        }

        void JsRTCodeParseAction_Emit(const EventLogEntry* evt, FileWriter* writer, ThreadContext* threadContext)
        {
            const JsRTCodeParseAction* cpAction = GetInlineEventDataAs<JsRTCodeParseAction, EventKind::CodeParseActionTag>(evt);

            writer->WriteKey(NSTokens::Key::argRetVal, NSTokens::Separator::CommaSeparator);
            NSSnapValues::EmitTTDVar(cpAction->Result, writer, NSTokens::Separator::NoSeparator);

            writer->WriteUInt64(NSTokens::Key::sourceContextId, cpAction->SourceContextId, NSTokens::Separator::CommaSeparator);
            writer->WriteTag<LoadScriptFlag>(NSTokens::Key::loadFlag, cpAction->LoadFlag, NSTokens::Separator::CommaSeparator);

            writer->WriteUInt32(NSTokens::Key::bodyCounterId, cpAction->BodyCtrId, NSTokens::Separator::CommaSeparator);

            writer->WriteString(NSTokens::Key::uri, cpAction->SourceUri, NSTokens::Separator::CommaSeparator);

            writer->WriteBool(NSTokens::Key::boolVal, cpAction->IsUtf8, NSTokens::Separator::CommaSeparator);
            writer->WriteLengthValue(cpAction->SourceByteLength, NSTokens::Separator::CommaSeparator);

            JsSupport::WriteCodeToFile(threadContext, true, cpAction->BodyCtrId, cpAction->IsUtf8, cpAction->SourceCode, cpAction->SourceByteLength);
        }

        void JsRTCodeParseAction_Parse(EventLogEntry* evt, ThreadContext* threadContext, FileReader* reader, UnlinkableSlabAllocator& alloc)
        {
            JsRTCodeParseAction* cpAction = GetInlineEventDataAs<JsRTCodeParseAction, EventKind::CodeParseActionTag>(evt);

            reader->ReadKey(NSTokens::Key::argRetVal, true);
            cpAction->Result = NSSnapValues::ParseTTDVar(false, reader);

            cpAction->SourceContextId = reader->ReadUInt64(NSTokens::Key::sourceContextId, true);
            cpAction->LoadFlag = reader->ReadTag<LoadScriptFlag>(NSTokens::Key::loadFlag, true);

            cpAction->BodyCtrId = reader->ReadUInt32(NSTokens::Key::bodyCounterId, true);

            reader->ReadString(NSTokens::Key::uri, alloc, cpAction->SourceUri, true);

            cpAction->IsUtf8 = reader->ReadBool(NSTokens::Key::boolVal, true);
            cpAction->SourceByteLength = reader->ReadLengthValue(true);

            cpAction->SourceCode = alloc.SlabAllocateArray<byte>(cpAction->SourceByteLength);

            JsSupport::ReadCodeFromFile(threadContext, true, cpAction->BodyCtrId, cpAction->IsUtf8, cpAction->SourceCode, cpAction->SourceByteLength);
        }

#if ENABLE_TTD_INTERNAL_DIAGNOSTICS
        int64 JsRTCallFunctionAction_GetLastNestedEventTime(const EventLogEntry* evt)
        {
            const JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);

            return cfAction->LastNestedEvent;
        }

        void JsRTCallFunctionAction_ProcessDiagInfoPre(EventLogEntry* evt, Js::Var funcVar, UnlinkableSlabAllocator& alloc)
        {
            JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);

            if(Js::JavascriptFunction::Is(funcVar))
            {
                Js::JavascriptString* displayName = Js::JavascriptFunction::FromVar(funcVar)->GetDisplayName();
                alloc.CopyStringIntoWLength(displayName->GetSz(), displayName->GetLength(), cfAction->FunctionName);
            }
            else
            {
                alloc.CopyNullTermStringInto(_u("#not a function#"), cfAction->FunctionName);
            }

            //In case we don't terminate add these nicely
            cfAction->LastNestedEvent = TTD_EVENT_MAXTIME;
        }

        void JsRTCallFunctionAction_ProcessDiagInfoPost(EventLogEntry* evt, int64 lastNestedEvent)
        {
            JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);

            cfAction->LastNestedEvent = lastNestedEvent;
        }
#endif

        void JsRTCallFunctionAction_ProcessArgs(EventLogEntry* evt, int32 rootDepth, int64 callEventTime, Js::Var funcVar, uint32 argc, Js::Var* argv, int64 topLevelCallbackEventTime, UnlinkableSlabAllocator& alloc)
        {
            JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);

            cfAction->CallbackDepth = rootDepth;
            cfAction->ArgCount = argc + 1;

            static_assert(sizeof(TTDVar) == sizeof(Js::Var), "These need to be the same size (and have same bit layout) for this to work!");

            cfAction->ArgArray = alloc.SlabAllocateArray<TTDVar>(cfAction->ArgCount);
            cfAction->ArgArray[0] = TTD_CONVERT_JSVAR_TO_TTDVAR(funcVar);
            js_memcpy_s(cfAction->ArgArray + 1, (cfAction->ArgCount -1) * sizeof(TTDVar), argv, argc * sizeof(Js::Var));

            cfAction->CallEventTime = callEventTime;

            cfAction->TopLevelCallbackEventTime = topLevelCallbackEventTime;

            cfAction->AdditionalReplayInfo = nullptr;

            //Result is initialized when we register this with the popper
        }

        void JsRTCallFunctionAction_Execute(const EventLogEntry* evt, ThreadContextTTD* executeContext)
        {
            TTD_REPLAY_ACTIVE_CONTEXT(executeContext);

            const JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);

            ThreadContext* threadContext = ctx->GetThreadContext();

            Js::Var jsFunctionVar = InflateVarInReplay(executeContext, cfAction->ArgArray[0]);
            TTD_REPLAY_VALIDATE_INCOMING_FUNCTION(jsFunctionVar, ctx);

            Js::JavascriptFunction *jsFunction = Js::JavascriptFunction::FromVar(jsFunctionVar);

            //remove implicit constructor function as first arg in callInfo and argument loop below
            Js::CallInfo callInfo((ushort)(cfAction->ArgCount - 1));
            for(uint32 i = 1; i < cfAction->ArgCount; ++i)
            {
                 Js::Var argi = InflateVarInReplay(executeContext, cfAction->ArgArray[i]);
                 TTD_REPLAY_VALIDATE_INCOMING_REFERENCE(argi, ctx);

                 cfAction->AdditionalReplayInfo->ExecArgs[i - 1] = argi;
            }
            Js::Arguments jsArgs(callInfo, cfAction->AdditionalReplayInfo->ExecArgs);

            //If this isn't a root function then just call it -- don't need to reset anything and exceptions can just continue
            if(cfAction->CallbackDepth != 0)
            {
                Js::Var result = jsFunction->CallRootFunction(jsArgs, ctx, true);
                if(result != nullptr)
                {
                    Assert(result == nullptr || !Js::CrossSite::NeedMarshalVar(result, ctx));
                }

                //since we tag in JsRT we need to tag here too
                JsRTActionHandleResultForReplay<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(executeContext, evt, result);

                TTDAssert(NSLogEvents::EventCompletesNormally(evt), "Why did we get a different completion");
            }
            else
            {
                threadContext->TTDLog->ResetCallStackForTopLevelCall(cfAction->TopLevelCallbackEventTime);
                if(threadContext->TTDExecutionInfo != nullptr)
                {
                    threadContext->TTDExecutionInfo->ResetCallStackForTopLevelCall(cfAction->TopLevelCallbackEventTime);
                }

                try
                {
                    Js::Var result = jsFunction->CallRootFunction(jsArgs, ctx, true);

                    //since we tag in JsRT we need to tag here too
                    JsRTActionHandleResultForReplay<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(executeContext, evt, result);

                    TTDAssert(NSLogEvents::EventCompletesNormally(evt), "Why did we get a different completion");
                }
                catch(const Js::JavascriptException& err)
                {
                    TTDAssert(NSLogEvents::EventCompletesWithException(evt), "Why did we get a different exception");

                    if(executeContext->GetActiveScriptContext()->ShouldPerformDebuggerAction())
                    {
                        //convert to uncaught debugger exception for host
                        TTDebuggerSourceLocation lastLocation;
                        threadContext->TTDExecutionInfo->GetLastExecutedTimeAndPositionForDebugger(lastLocation);
                        JsRTCallFunctionAction_SetLastExecutedStatementAndFrameInfo(const_cast<EventLogEntry*>(evt), lastLocation);

                        err.GetAndClear();  // discard exception object

                        //Reset any step controller logic
                        if(ctx->GetThreadContext()->GetDebugManager() != nullptr)
                        {
                            ctx->GetThreadContext()->GetDebugManager()->stepController.Deactivate();
                        }

                        throw TTDebuggerAbortException::CreateUncaughtExceptionAbortRequest(lastLocation.GetRootEventTime(), _u("Uncaught JavaScript exception -- Propagate to top-level."));
                    }

                    throw;
                }
                catch(Js::ScriptAbortException)
                {
                    TTDAssert(NSLogEvents::EventCompletesWithException(evt), "Why did we get a different exception");

                    if(executeContext->GetActiveScriptContext()->ShouldPerformDebuggerAction())
                    {
                        //convert to uncaught debugger exception for host
                        TTDebuggerSourceLocation lastLocation;
                        threadContext->TTDExecutionInfo->GetLastExecutedTimeAndPositionForDebugger(lastLocation);
                        JsRTCallFunctionAction_SetLastExecutedStatementAndFrameInfo(const_cast<EventLogEntry*>(evt), lastLocation);

                        throw TTDebuggerAbortException::CreateUncaughtExceptionAbortRequest(lastLocation.GetRootEventTime(), _u("Uncaught Script exception -- Propagate to top-level."));
                    }
                    else
                    {
                        throw;
                    }
                }
                catch(...)
                {
                    if(executeContext->GetActiveScriptContext()->ShouldPerformDebuggerAction())
                    {
                        TTDebuggerSourceLocation lastLocation;
                        threadContext->TTDExecutionInfo->GetLastExecutedTimeAndPositionForDebugger(lastLocation);
                        JsRTCallFunctionAction_SetLastExecutedStatementAndFrameInfo(const_cast<EventLogEntry*>(evt), lastLocation);
                    }

                    throw;
                }
            }
        }

        void JsRTCallFunctionAction_UnloadEventMemory(EventLogEntry* evt, UnlinkableSlabAllocator& alloc)
        {
            JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);

            alloc.UnlinkAllocation(cfAction->ArgArray);

            if(cfAction->AdditionalReplayInfo != nullptr)
            {
                if(cfAction->AdditionalReplayInfo->ExecArgs != nullptr)
                {
                    alloc.UnlinkAllocation(cfAction->AdditionalReplayInfo->ExecArgs);
                }

                JsRTCallFunctionAction_UnloadSnapshot(evt);

                if(cfAction->AdditionalReplayInfo->LastExecutedLocation.HasValue())
                {
                    cfAction->AdditionalReplayInfo->LastExecutedLocation.Clear();
                }

                alloc.UnlinkAllocation(cfAction->AdditionalReplayInfo);
            }

#if ENABLE_TTD_INTERNAL_DIAGNOSTICS
            alloc.UnlinkString(cfAction->FunctionName);
#endif
        }

        void JsRTCallFunctionAction_Emit(const EventLogEntry* evt, FileWriter* writer, ThreadContext* threadContext)
        {
            const JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);

            writer->WriteKey(NSTokens::Key::argRetVal, NSTokens::Separator::CommaSeparator);
            NSSnapValues::EmitTTDVar(cfAction->Result, writer, NSTokens::Separator::NoSeparator);

            writer->WriteInt32(NSTokens::Key::rootNestingDepth, cfAction->CallbackDepth, NSTokens::Separator::CommaSeparator);

            writer->WriteLengthValue(cfAction->ArgCount, NSTokens::Separator::CommaSeparator);

            writer->WriteSequenceStart_DefaultKey(NSTokens::Separator::CommaSeparator);
            for(uint32 i = 0; i < cfAction->ArgCount; ++i)
            {
                NSTokens::Separator sep = (i != 0) ? NSTokens::Separator::CommaSeparator : NSTokens::Separator::NoSeparator;
                NSSnapValues::EmitTTDVar(cfAction->ArgArray[i], writer, sep);
            }
            writer->WriteSequenceEnd();

            writer->WriteInt64(NSTokens::Key::eventTime, cfAction->CallEventTime, NSTokens::Separator::CommaSeparator);

            writer->WriteInt64(NSTokens::Key::eventTime, cfAction->TopLevelCallbackEventTime, NSTokens::Separator::CommaSeparator);

#if ENABLE_TTD_INTERNAL_DIAGNOSTICS
            writer->WriteInt64(NSTokens::Key::i64Val, cfAction->LastNestedEvent, NSTokens::Separator::CommaSeparator);
            writer->WriteString(NSTokens::Key::name, cfAction->FunctionName, NSTokens::Separator::CommaSeparator);
#endif
        }

        void JsRTCallFunctionAction_Parse(EventLogEntry* evt, ThreadContext* threadContext, FileReader* reader, UnlinkableSlabAllocator& alloc)
        {
            JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);

            reader->ReadKey(NSTokens::Key::argRetVal, true);
            cfAction->Result = NSSnapValues::ParseTTDVar(false, reader);

            cfAction->CallbackDepth = reader->ReadInt32(NSTokens::Key::rootNestingDepth, true);

            cfAction->ArgCount = reader->ReadLengthValue(true);
            cfAction->ArgArray = alloc.SlabAllocateArray<TTDVar>(cfAction->ArgCount);

            reader->ReadSequenceStart_WDefaultKey(true);
            for(uint32 i = 0; i < cfAction->ArgCount; ++i)
            {
                cfAction->ArgArray[i] = NSSnapValues::ParseTTDVar(i != 0, reader);
            }
            reader->ReadSequenceEnd();

            cfAction->CallEventTime = reader->ReadInt64(NSTokens::Key::eventTime, true);

            cfAction->TopLevelCallbackEventTime = reader->ReadInt64(NSTokens::Key::eventTime, true);

            cfAction->AdditionalReplayInfo = alloc.SlabAllocateStruct<JsRTCallFunctionAction_ReplayAdditionalInfo>();

            cfAction->AdditionalReplayInfo->RtRSnap = nullptr;
            cfAction->AdditionalReplayInfo->ExecArgs = (cfAction->ArgCount > 1) ? alloc.SlabAllocateArray<Js::Var>(cfAction->ArgCount - 1) : nullptr; //ArgCount includes slot for function which we don't use in exec

            cfAction->AdditionalReplayInfo->LastExecutedLocation.Initialize();

#if ENABLE_TTD_INTERNAL_DIAGNOSTICS
            cfAction->LastNestedEvent = reader->ReadInt64(NSTokens::Key::i64Val, true);
            reader->ReadString(NSTokens::Key::name, alloc, cfAction->FunctionName, true);
#endif
        }

        void JsRTCallFunctionAction_UnloadSnapshot(EventLogEntry* evt)
        {
            JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);

            if(cfAction->AdditionalReplayInfo != nullptr && cfAction->AdditionalReplayInfo->RtRSnap != nullptr)
            {
                TT_HEAP_DELETE(SnapShot, cfAction->AdditionalReplayInfo->RtRSnap);
                cfAction->AdditionalReplayInfo->RtRSnap = nullptr;
            }
        }

        void JsRTCallFunctionAction_SetLastExecutedStatementAndFrameInfo(EventLogEntry* evt, const TTDebuggerSourceLocation& lastSourceLocation)
        {
            JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);

            cfAction->AdditionalReplayInfo->LastExecutedLocation.SetLocationCopy(lastSourceLocation);
        }

        bool JsRTCallFunctionAction_GetLastExecutedStatementAndFrameInfoForDebugger(const EventLogEntry* evt, TTDebuggerSourceLocation& lastSourceInfo)
        {
            const JsRTCallFunctionAction* cfAction = GetInlineEventDataAs<JsRTCallFunctionAction, EventKind::CallExistingFunctionActionTag>(evt);
            if(cfAction->AdditionalReplayInfo->LastExecutedLocation.HasValue())
            {
                lastSourceInfo.SetLocationCopy(cfAction->AdditionalReplayInfo->LastExecutedLocation);
                return true;
            }
            else
            {
                lastSourceInfo.Clear();
                return false;
            }
        }
    }
}

#endif