void TTDebuggerSourceLocation::SetLocation(const TTDebuggerSourceLocation& other)
{
#if !ENABLE_TTD_DEBUGGING
AssertMsg(false, "Debugger is not enabled so you shouldn't be calling this");
this->Clear();
#else
this->m_etime = other.m_etime;
this->m_ftime = other.m_ftime;
this->m_ltime = other.m_ltime;
this->m_docid = other.m_docid;
this->m_functionLine = other.m_functionLine;
this->m_functionColumn = other.m_functionColumn;
this->m_line = other.m_line;
this->m_column = other.m_column;
if(this->m_sourceFile != nullptr)
{
delete[] this->m_sourceFile;
}
this->m_sourceFile = nullptr;
if(other.m_sourceFile != nullptr)
{
size_t char16Length = wcslen(other.m_sourceFile) + 1;
size_t byteLength = char16Length * sizeof(char16);
this->m_sourceFile = new char16[char16Length];
js_memcpy_s(this->m_sourceFile, byteLength, other.m_sourceFile, byteLength);
}
#endif
}
Js::Var CreateBuffer(const uint8* buf, uint size, void* user_data)
{
Context* ctx = (Context*)user_data;
ArrayBuffer* arrayBuffer = ctx->scriptContext->GetLibrary()->CreateArrayBuffer(size);
js_memcpy_s(arrayBuffer->GetBuffer(), arrayBuffer->GetByteLength(), buf, size);
return arrayBuffer;
}
const StElemInfo *ReadOnlyDynamicProfileInfo::GetStElemInfo(FunctionBody *functionBody, ProfileId stElemId)
{
Assert(functionBody);
Assert(stElemId < functionBody->GetProfiledStElemCount());
// This data is accessed multiple times. Since the original profile data may be changing on the foreground thread,
// the first time it's accessed it will be copied from the original profile data (if we're jitting in the
// background).
if(!stElemInfo)
{
if(backgroundAllocator)
{
// Jitting in the background
StElemInfo *const info = AnewArray(backgroundAllocator, StElemInfo, functionBody->GetProfiledStElemCount());
js_memcpy_s(
info,
functionBody->GetProfiledStElemCount() * sizeof(info[0]),
profileInfo->GetStElemInfo(),
functionBody->GetProfiledStElemCount() * sizeof(info[0]));
stElemInfo = info;
}
else
{
// Jitting in the foreground
stElemInfo = profileInfo->GetStElemInfo();
}
}
return &stElemInfo[stElemId];
}
bool BigInt::FResize(long clu)
{
AssertBiNoVal(this);
ulong *prglu;
if (clu <= m_cluMax)
return true;
clu += clu;
if (m_prglu == m_rgluInit)
{
if ((INT_MAX / sizeof(ulong) < clu) || (NULL == (prglu = (ulong *)malloc(clu * sizeof(ulong)))))
return false;
if (0 < m_clu)
js_memcpy_s(prglu, clu * sizeof(ulong), m_prglu, m_clu * sizeof(ulong));
}
else if (NULL == (prglu = (ulong *)realloc(m_prglu, clu * sizeof(ulong))))
return false;
m_prglu = prglu;
m_cluMax = clu;
AssertBiNoVal(this);
return true;
}
void TTDebuggerSourceLocation::SetLocation(int64 etime, int64 ftime, int64 ltime, Js::FunctionBody* body, ULONG line, LONG column)
{
#if !ENABLE_TTD_DEBUGGING
AssertMsg(false, "Debugger is not enabled so you shouldn't be calling this");
this->Clear();
#else
this->m_etime = etime;
this->m_ftime = ftime;
this->m_ltime = ltime;
this->m_docid = body->GetUtf8SourceInfo()->GetSourceInfoId();
this->m_functionLine = body->GetLineNumber();
this->m_functionColumn = body->GetColumnNumber();
this->m_line = (uint32)line;
this->m_column = (uint32)column;
if(this->m_sourceFile != nullptr)
{
delete[] this->m_sourceFile;
}
this->m_sourceFile = nullptr;
const char16* sourceFile = body->GetSourceContextInfo()->url;
if(sourceFile != nullptr)
{
size_t char16Length = wcslen(sourceFile) + 1;
size_t byteLength = char16Length * sizeof(char16);
this->m_sourceFile = new char16[char16Length];
js_memcpy_s(this->m_sourceFile, byteLength, sourceFile, byteLength);
}
#endif
}
Utf8SourceInfo*
Utf8SourceInfo::New(ScriptContext* scriptContext, LPCUTF8 utf8String, int32 length, size_t numBytes, SRCINFO const* srcInfo)
{
utf8char_t * newUtf8String = RecyclerNewArrayLeaf(scriptContext->GetRecycler(), utf8char_t, numBytes + 1);
js_memcpy_s(newUtf8String, numBytes + 1, utf8String, numBytes + 1);
return NewWithNoCopy(scriptContext, newUtf8String, length, numBytes, srcInfo);
}
void TTDComparePath::WritePathToConsole(ThreadContext* threadContext, bool printNewline, char16* namebuff) const
{
if(this->m_prefix != nullptr)
{
this->m_prefix->WritePathToConsole(threadContext, false, namebuff);
}
if(this->m_stepKind == StepKind::PropertyData || this->m_stepKind == StepKind::PropertyGetter || this->m_stepKind == StepKind::PropertySetter)
{
const Js::PropertyRecord* pRecord = threadContext->GetPropertyName((Js::PropertyId)this->m_step.IndexOrPID);
js_memcpy_s(namebuff, 256 * sizeof(char16), pRecord->GetBuffer(), pRecord->GetLength() * sizeof(char16));
namebuff[pRecord->GetLength()] = _u('\0');
}
bool isFirst = (this->m_prefix == nullptr);
switch(this->m_stepKind)
{
case StepKind::Empty:
break;
case StepKind::Root:
wprintf(_u("root#%I64i"), this->m_step.IndexOrPID);
break;
case StepKind::PropertyData:
wprintf(_u("%ls%ls"), (isFirst ? _u("") : _u(".")), namebuff);
break;
case StepKind::PropertyGetter:
wprintf(_u("%ls<%ls"), (isFirst ? _u("") : _u(".")), namebuff);
break;
case StepKind::PropertySetter:
wprintf(_u("%ls>%ls"), (isFirst ? _u("") : _u(".")), namebuff);
break;
case StepKind::Array:
wprintf(_u("[%I64i]"), this->m_step.IndexOrPID);
break;
case StepKind::Scope:
wprintf(_u("%ls_scope[%I64i]"), (isFirst ? _u("") : _u(".")), this->m_step.IndexOrPID);
break;
case StepKind::SlotArray:
wprintf(_u("%ls_slots[%I64i]"), (isFirst ? _u("") : _u(".")), this->m_step.IndexOrPID);
break;
case StepKind::FunctionBody:
wprintf(_u("%ls%ls"), (isFirst ? _u("") : _u(".")), this->m_step.OptName);
break;
case StepKind::Special:
wprintf(_u("%ls_%ls"), (isFirst ? _u("") : _u(".")), this->m_step.OptName);
break;
case StepKind::SpecialArray:
wprintf(_u("%ls_%ls[%I64i]"), (isFirst ? _u("") : _u(".")), this->m_step.OptName, this->m_step.IndexOrPID);
break;
default:
TTDAssert(false, "Unknown tag in switch statement!!!");
break;
}
if(printNewline)
{
wprintf(_u("\n"));
}
}
// This will make a copy of the entire buffer
InternalString *InternalString::New(ArenaAllocator* alloc, const char16* content, charcount_t length)
{
size_t bytelength = sizeof(char16) * length;
DWORD* allocbuffer = (DWORD*)alloc->Alloc(sizeof(DWORD) + bytelength + sizeof(char16));
allocbuffer[0] = (DWORD) bytelength;
char16* buffer = (char16*)(allocbuffer+1);
js_memcpy_s(buffer, bytelength, content, bytelength);
buffer[length] = L'\0';
InternalString* newInstance = Anew(alloc, InternalString, buffer, length);
return newInstance;
}
void
BVFixed::Copy(const BVFixed*bv)
{
AssertBV(bv);
Assert(len >= bv->len);
#if 1
js_memcpy_s(&this->data[0], WordCount() * sizeof(BVUnit), &bv->data[0], bv->WordCount() * sizeof(BVUnit));
#else
this->for_each(bv, &BVUnit::Copy);
#endif
}
TTDebuggerSourceLocation::TTDebuggerSourceLocation(const TTDebuggerSourceLocation& other)
: m_etime(other.m_etime), m_ftime(other.m_ftime), m_ltime(other.m_ltime), m_sourceFile(nullptr), m_docid(other.m_docid), m_functionLine(other.m_functionLine), m_functionColumn(other.m_functionColumn), m_line(other.m_line), m_column(other.m_column)
{
if(other.m_sourceFile != nullptr)
{
size_t char16Length = wcslen(other.m_sourceFile) + 1;
size_t byteLength = char16Length * sizeof(char16);
this->m_sourceFile = new char16[char16Length];
js_memcpy_s(this->m_sourceFile, byteLength, other.m_sourceFile, byteLength);
}
}
bool BigInt::FInitFromRglu(ulong *prglu, long clu)
{
AssertBi(this);
Assert(clu >= 0);
Assert(prglu != 0);
if (clu > m_cluMax && !FResize(clu))
return false;
m_clu = clu;
if (clu > 0)
js_memcpy_s(m_prglu, m_clu * sizeof(ulong), prglu, clu * sizeof(ulong));
AssertBi(this);
return true;
}
// This will make a copy of the entire buffer
// Allocated using recycler memory
InternalString *InternalString::New(Recycler* recycler, const char16* content, charcount_t length)
{
size_t bytelength = sizeof(char16) * length;
// Allocate 3 extra bytes, two for the first DWORD with the size, the third for the null character
// This is so that we can pretend that internal strings are BSTRs for purposes of clients who want to use
// it as thus
const unsigned char offset = sizeof(DWORD)/sizeof(char16);
InternalString* newInstance = RecyclerNewPlusLeaf(recycler, bytelength + (sizeof(DWORD) + sizeof(char16)), InternalString, nullptr, length, offset);
DWORD* allocbuffer = (DWORD*) (newInstance + 1);
allocbuffer[0] = (DWORD) bytelength;
char16* buffer = (char16*)(allocbuffer + 1);
js_memcpy_s(buffer, bytelength, content, bytelength);
buffer[length] = L'\0';
newInstance->m_content = (const char16*) allocbuffer;
return newInstance;
}
Var JavascriptGeneratorFunction::EntryAsyncFunctionImplementation(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(stackArgs, callInfo);
ScriptContext* scriptContext = function->GetScriptContext();
JavascriptLibrary* library = scriptContext->GetLibrary();
RecyclableObject* prototype = scriptContext->GetLibrary()->GetNull();
// InterpreterStackFrame takes a pointer to the args, so copy them to the recycler heap
// and use that buffer for this InterpreterStackFrame.
Var* argsHeapCopy = RecyclerNewArray(scriptContext->GetRecycler(), Var, stackArgs.Info.Count);
js_memcpy_s(argsHeapCopy, sizeof(Var) * stackArgs.Info.Count, stackArgs.Values, sizeof(Var) * stackArgs.Info.Count);
Arguments heapArgs(callInfo, argsHeapCopy);
JavascriptExceptionObject* e = nullptr;
JavascriptPromiseResolveOrRejectFunction* resolve;
JavascriptPromiseResolveOrRejectFunction* reject;
JavascriptPromiseAsyncSpawnExecutorFunction* executor =
library->CreatePromiseAsyncSpawnExecutorFunction(
JavascriptPromise::EntryJavascriptPromiseAsyncSpawnExecutorFunction,
scriptContext->GetLibrary()->CreateGenerator(heapArgs, JavascriptAsyncFunction::FromVar(function)->GetGeneratorVirtualScriptFunction(), prototype),
stackArgs[0]);
JavascriptPromise* promise = library->CreatePromise();
JavascriptPromise::InitializePromise(promise, &resolve, &reject, scriptContext);
try
{
CALL_FUNCTION(executor, CallInfo(CallFlags_Value, 3), library->GetUndefined(), resolve, reject);
}
catch (JavascriptExceptionObject* ex)
{
e = ex;
}
if (e != nullptr)
{
JavascriptPromise::TryRejectWithExceptionObject(e, reject, scriptContext);
}
return promise;
}
void ExternalCallEventLogEntry_ProcessArgs(EventLogEntry* evt, int32 rootDepth, Js::JavascriptFunction* function, uint32 argc, Js::Var* argv, double beginTime, UnlinkableSlabAllocator& alloc)
{
ExternalCallEventLogEntry* callEvt = GetInlineEventDataAs<ExternalCallEventLogEntry, EventKind::ExternalCallTag>(evt);
callEvt->AdditionalInfo = alloc.SlabAllocateStruct<ExternalCallEventLogEntry_AdditionalInfo>();
callEvt->RootNestingDepth = rootDepth;
callEvt->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!");
callEvt->ArgArray = alloc.SlabAllocateArray<TTDVar>(callEvt->ArgCount);
callEvt->ArgArray[0] = static_cast<TTDVar>(function);
js_memcpy_s(callEvt->ArgArray + 1, (callEvt->ArgCount - 1) * sizeof(TTDVar), argv, argc * sizeof(Js::Var));
//Initialize this info in case we terminate without completing (e.g. exit(1))
callEvt->AdditionalInfo->BeginTime = beginTime;
callEvt->AdditionalInfo->EndTime = -1.0;
callEvt->ReturnValue = nullptr;
callEvt->AdditionalInfo->LastNestedEventTime = TTD_EVENT_MAXTIME;
}
void
BVFixed::CopyBits(const BVFixed * bv, BVIndex i)
{
AssertBV(bv);
BVIndex offset = BVUnit::Offset(i);
BVIndex position = BVUnit::Position(i);
BVIndex len = bv->WordCount() - position;
BVIndex copylen = min(WordCount(), len);
if (offset == 0)
{
js_memcpy_s(&this->data[0], copylen * sizeof(BVUnit), &bv->data[BVUnit::Position(i)], copylen * sizeof(BVUnit));
}
else
{
BVIndex pos = position;
for (BVIndex j = 0; j < copylen; j++)
{
Assert(pos < bv->WordCount());
this->data[j] = bv->data[pos];
this->data[j].ShiftRight(offset);
pos++;
if (pos >= bv->WordCount())
{
break;
}
BVUnit temp = bv->data[pos];
temp.ShiftLeft(BVUnit::BitsPerWord - offset);
this->data[j].Or(temp);
}
}
#if DBG
for (BVIndex curr = i; curr < i + this->Length(); curr++)
{
Assert(this->Test(curr - i) == bv->Test(curr));
}
#endif
}
Var JavascriptGeneratorFunction::EntryGeneratorFunctionImplementation(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(stackArgs, callInfo);
ScriptContext* scriptContext = function->GetScriptContext();
JavascriptGeneratorFunction* generatorFunction = JavascriptGeneratorFunction::FromVar(function);
// InterpreterStackFrame takes a pointer to the args, so copy them to the recycler heap
// and use that buffer for this InterpreterStackFrame.
Var* argsHeapCopy = RecyclerNewArray(scriptContext->GetRecycler(), Var, stackArgs.Info.Count);
js_memcpy_s(argsHeapCopy, sizeof(Var) * stackArgs.Info.Count, stackArgs.Values, sizeof(Var) * stackArgs.Info.Count);
Arguments heapArgs(callInfo, argsHeapCopy);
DynamicObject* prototype = scriptContext->GetLibrary()->CreateGeneratorConstructorPrototypeObject();
JavascriptGenerator* generator = scriptContext->GetLibrary()->CreateGenerator(heapArgs, generatorFunction->scriptFunction, prototype);
// Set the prototype from constructor
JavascriptOperators::OrdinaryCreateFromConstructor(function, generator, prototype, scriptContext);
Assert(!(callInfo.Flags & CallFlags_New));
return generator;
}
LeakReport::UrlRecord *
LeakReport::LogUrl(char16 const * url, void * globalObject)
{
UrlRecord * record = NoCheckHeapNewStruct(UrlRecord);
size_t length = wcslen(url) + 1; // Add 1 for the NULL.
char16* urlCopy = NoCheckHeapNewArray(char16, length);
js_memcpy_s(urlCopy, (length - 1) * sizeof(char16), url, (length - 1) * sizeof(char16));
urlCopy[length - 1] = _u('\0');
record->url = urlCopy;
#if _MSC_VER
record->time = _time64(NULL);
#else
record->time = time(NULL);
#endif
record->tid = ::GetCurrentThreadId();
record->next = nullptr;
record->scriptEngine = nullptr;
record->globalObject = globalObject;
AutoCriticalSection autocs(&s_cs);
if (LeakReport::urlRecordHead == nullptr)
{
Assert(LeakReport::urlRecordTail == nullptr);
LeakReport::urlRecordHead = record;
LeakReport::urlRecordTail = record;
}
else
{
LeakReport::urlRecordTail->next = record;
LeakReport::urlRecordTail = record;
}
return record;
}
void InterpreterThunkEmitter::NewThunkBlock()
{
Assert(this->thunkCount == 0);
BYTE* buffer;
BYTE* currentBuffer;
DWORD bufferSize = BlockSize;
DWORD thunkCount = 0;
allocation = emitBufferManager.AllocateBuffer(bufferSize, &buffer, /*readWrite*/ true);
currentBuffer = buffer;
#ifdef _M_X64
PrologEncoder prologEncoder(allocator);
prologEncoder.EncodeSmallProlog(PrologSize, StackAllocSize);
DWORD pdataSize = prologEncoder.SizeOfPData();
#elif defined(_M_ARM32_OR_ARM64)
DWORD pdataSize = sizeof(RUNTIME_FUNCTION);
#else
DWORD pdataSize = 0;
#endif
DWORD bytesRemaining = bufferSize;
DWORD bytesWritten = 0;
DWORD epilogSize = sizeof(Epilog);
// Ensure there is space for PDATA at the end
BYTE* pdataStart = currentBuffer + (bufferSize - Math::Align(pdataSize, EMIT_BUFFER_ALIGNMENT));
BYTE* epilogStart = pdataStart - Math::Align(epilogSize, EMIT_BUFFER_ALIGNMENT);
// Copy the thunk buffer and modify it.
js_memcpy_s(currentBuffer, bytesRemaining, InterpreterThunk, HeaderSize);
EncodeInterpreterThunk(currentBuffer, buffer, HeaderSize, epilogStart, epilogSize);
currentBuffer += HeaderSize;
bytesRemaining -= HeaderSize;
// Copy call buffer
DWORD callSize = sizeof(Call);
while(currentBuffer < epilogStart - callSize)
{
js_memcpy_s(currentBuffer, bytesRemaining, Call, callSize);
#if _M_ARM
int offset = (epilogStart - (currentBuffer + JmpOffset));
Assert(offset >= 0);
DWORD encodedOffset = EncoderMD::BranchOffset_T2_24(offset);
DWORD encodedBranch = /*opcode=*/ 0x9000F000 | encodedOffset;
Emit(currentBuffer, JmpOffset, encodedBranch);
#elif _M_ARM64
int64 offset = (epilogStart - (currentBuffer + JmpOffset));
Assert(offset >= 0);
DWORD encodedOffset = EncoderMD::BranchOffset_26(offset);
DWORD encodedBranch = /*opcode=*/ 0x14000000 | encodedOffset;
Emit(currentBuffer, JmpOffset, encodedBranch);
#else
// jump requires an offset from the end of the jump instruction.
int offset = (int)(epilogStart - (currentBuffer + JmpOffset + sizeof(int)));
Assert(offset >= 0);
Emit(currentBuffer, JmpOffset, offset);
#endif
currentBuffer += callSize;
bytesRemaining -= callSize;
thunkCount++;
}
// Fill any gap till start of epilog
bytesWritten = FillDebugBreak(currentBuffer, (DWORD)(epilogStart - currentBuffer));
bytesRemaining -= bytesWritten;
currentBuffer += bytesWritten;
// Copy epilog
bytesWritten = CopyWithAlignment(currentBuffer, bytesRemaining, Epilog, epilogSize, EMIT_BUFFER_ALIGNMENT);
currentBuffer += bytesWritten;
bytesRemaining -= bytesWritten;
// Generate and register PDATA
#if PDATA_ENABLED
BYTE* epilogEnd = epilogStart + epilogSize;
DWORD functionSize = (DWORD)(epilogEnd - buffer);
Assert(pdataStart == currentBuffer);
#ifdef _M_X64
Assert(bytesRemaining >= pdataSize);
BYTE* pdata = prologEncoder.Finalize(buffer, functionSize, pdataStart);
bytesWritten = CopyWithAlignment(pdataStart, bytesRemaining, pdata, pdataSize, EMIT_BUFFER_ALIGNMENT);
#elif defined(_M_ARM32_OR_ARM64)
RUNTIME_FUNCTION pdata;
GeneratePdata(buffer, functionSize, &pdata);
bytesWritten = CopyWithAlignment(pdataStart, bytesRemaining, (const BYTE*)&pdata, pdataSize, EMIT_BUFFER_ALIGNMENT);
#endif
void* pdataTable;
PDataManager::RegisterPdata((PRUNTIME_FUNCTION) pdataStart, (ULONG_PTR) buffer, (ULONG_PTR) epilogEnd, &pdataTable);
#endif
if (!emitBufferManager.CommitReadWriteBufferForInterpreter(allocation, buffer, bufferSize))
{
Js::Throw::OutOfMemory();
}
// Call to set VALID flag for CFG check
ThreadContext::GetContextForCurrentThread()->SetValidCallTargetForCFG(buffer);
// Update object state only at the end when everything has succeeded - and no exceptions can be thrown.
ThunkBlock* block = this->thunkBlocks.PrependNode(allocator, buffer);
UNREFERENCED_PARAMETER(block);
#if PDATA_ENABLED
block->SetPdata(pdataTable);
#endif
this->thunkCount = thunkCount;
this->thunkBuffer = buffer;
}
// SharedArrayBuffer.prototype.slice
Var SharedArrayBuffer::EntrySlice(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
ScriptContext* scriptContext = function->GetScriptContext();
AssertMsg(args.Info.Count > 0, "Should always have implicit 'this'");
Assert(!(callInfo.Flags & CallFlags_New));
if (!SharedArrayBuffer::Is(args[0]))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedSharedArrayBufferObject);
}
JavascriptLibrary* library = scriptContext->GetLibrary();
SharedArrayBuffer* currentBuffer = SharedArrayBuffer::FromVar(args[0]);
int64 currentLen = (int64)currentBuffer->GetByteLength();
int64 start = 0, end = 0;
int64 newLen = 0;
// If no start or end arguments, use the entire length
if (args.Info.Count < 2)
{
newLen = currentLen;
}
else
{
start = JavascriptArray::GetIndexFromVar(args[1], currentLen, scriptContext);
// If no end argument, use length as the end
if (args.Info.Count < 3 || args[2] == library->GetUndefined())
{
end = currentLen;
}
else
{
end = JavascriptArray::GetIndexFromVar(args[2], currentLen, scriptContext);
}
newLen = end > start ? end - start : 0;
}
// We can't have allocated an SharedArrayBuffer with byteLength > MaxArrayBufferLength.
// start and end are clamped to valid indices, so the new length also cannot exceed MaxArrayBufferLength.
// Therefore, should be safe to cast down newLen to uint32.
Assert(newLen < MaxSharedArrayBufferLength);
uint32 newbyteLength = static_cast<uint32>(newLen);
SharedArrayBuffer* newBuffer = nullptr;
if (scriptContext->GetConfig()->IsES6SpeciesEnabled())
{
Var constructorVar = JavascriptOperators::SpeciesConstructor(currentBuffer, scriptContext->GetLibrary()->GetSharedArrayBufferConstructor(), scriptContext);
JavascriptFunction* constructor = JavascriptFunction::FromVar(constructorVar);
Js::Var constructorArgs[] = { constructor, JavascriptNumber::ToVar(newbyteLength, scriptContext) };
Js::CallInfo constructorCallInfo(Js::CallFlags_New, _countof(constructorArgs));
Js::Var newVar = JavascriptOperators::NewScObject(constructor, Js::Arguments(constructorCallInfo, constructorArgs), scriptContext);
if (!SharedArrayBuffer::Is(newVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedSharedArrayBufferObject);
}
newBuffer = SharedArrayBuffer::FromVar(newVar);
if (newBuffer == currentBuffer)
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedSharedArrayBufferObject);
}
if (newBuffer->GetByteLength() < newbyteLength)
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_ArgumentOutOfRange, _u("SharedArrayBuffer.prototype.slice"));
}
}
else
{
newBuffer = library->CreateSharedArrayBuffer(newbyteLength);
}
Assert(newBuffer);
Assert(newBuffer->GetByteLength() >= newbyteLength);
// Don't bother doing memcpy if we aren't copying any elements
if (newbyteLength > 0)
{
AssertMsg(currentBuffer->GetBuffer() != nullptr, "buffer must not be null when we copy from it");
js_memcpy_s(newBuffer->GetBuffer(), newbyteLength, currentBuffer->GetBuffer() + start, newbyteLength);
}
return newBuffer;
}