JSValue JSStringJoiner::join(ExecState* exec)
{
if (!m_isValid)
return throwOutOfMemoryError(exec);
if (!m_strings.size())
return jsEmptyString(exec);
Checked<size_t, RecordOverflow> separatorLength = m_separator.length();
// FIXME: add special cases of joinStrings() for (separatorLength == 0) and (separatorLength == 1).
ASSERT(m_strings.size() > 0);
Checked<size_t, RecordOverflow> totalSeparactorsLength = separatorLength * (m_strings.size() - 1);
Checked<size_t, RecordOverflow> outputStringSize = totalSeparactorsLength + m_accumulatedStringsLength;
size_t finalSize;
if (outputStringSize.safeGet(finalSize) == CheckedState::DidOverflow)
return throwOutOfMemoryError(exec);
if (!outputStringSize)
return jsEmptyString(exec);
RefPtr<StringImpl> outputStringImpl;
if (m_is8Bits)
outputStringImpl = joinStrings<LChar>(m_strings, m_separator, finalSize);
else
outputStringImpl = joinStrings<UChar>(m_strings, m_separator, finalSize);
if (!outputStringImpl)
return throwOutOfMemoryError(exec);
return JSString::create(exec->vm(), outputStringImpl.release());
}
void HTMLCanvasElement::updateExternallyAllocatedMemory() const
{
int bufferCount = 0;
if (m_imageBuffer)
bufferCount++;
if (is3D())
bufferCount += 2;
if (m_copiedImage)
bufferCount++;
if (m_presentedImage)
bufferCount++;
Checked<intptr_t, RecordOverflow> checkedExternallyAllocatedMemory = 4 * bufferCount;
checkedExternallyAllocatedMemory *= width();
checkedExternallyAllocatedMemory *= height();
intptr_t externallyAllocatedMemory;
if (checkedExternallyAllocatedMemory.safeGet(externallyAllocatedMemory) == CheckedState::DidOverflow)
externallyAllocatedMemory = std::numeric_limits<intptr_t>::max();
// Subtracting two intptr_t that are known to be positive will never underflow.
v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(externallyAllocatedMemory - m_externallyAllocatedMemory);
m_externallyAllocatedMemory = externallyAllocatedMemory;
}