RefPtr<AtomicStringImpl> JSRopeString::resolveRopeToExistingAtomicString(ExecState* exec) const
{
if (length() > maxLengthForOnStackResolve) {
resolveRope(exec);
if (RefPtr<AtomicStringImpl> existingAtomicString = AtomicStringImpl::lookUp(m_value.impl())) {
m_value = *existingAtomicString;
setIs8Bit(m_value.impl()->is8Bit());
clearFibers();
return existingAtomicString;
}
return nullptr;
}
if (is8Bit()) {
LChar buffer[maxLengthForOnStackResolve];
resolveRopeInternal8(buffer);
if (RefPtr<AtomicStringImpl> existingAtomicString = AtomicStringImpl::lookUp(buffer, length())) {
m_value = *existingAtomicString;
setIs8Bit(m_value.impl()->is8Bit());
clearFibers();
return existingAtomicString;
}
} else {
UChar buffer[maxLengthForOnStackResolve];
resolveRopeInternal16(buffer);
if (RefPtr<AtomicStringImpl> existingAtomicString = AtomicStringImpl::lookUp(buffer, length())) {
m_value = *existingAtomicString;
setIs8Bit(m_value.impl()->is8Bit());
clearFibers();
return existingAtomicString;
}
}
return nullptr;
}
void JSRopeString::resolveRope(ExecState* exec) const
{
ASSERT(isRope());
if (is8Bit()) {
LChar* buffer;
if (RefPtr<StringImpl> newImpl = StringImpl::tryCreateUninitialized(m_length, buffer)) {
Heap::heap(this)->reportExtraMemoryCost(newImpl->cost());
m_value = newImpl.release();
} else {
outOfMemory(exec);
return;
}
resolveRopeInternal8(buffer);
clearFibers();
ASSERT(!isRope());
return;
}
UChar* buffer;
if (RefPtr<StringImpl> newImpl = StringImpl::tryCreateUninitialized(m_length, buffer)) {
Heap::heap(this)->reportExtraMemoryCost(newImpl->cost());
m_value = newImpl.release();
} else {
outOfMemory(exec);
return;
}
resolveRopeInternal16(buffer);
clearFibers();
ASSERT(!isRope());
}
void JSRopeString::resolveRopeToAtomicString(ExecState* exec) const
{
if (length() > maxLengthForOnStackResolve) {
resolveRope(exec);
m_value = AtomicString(m_value);
setIs8Bit(m_value.impl()->is8Bit());
return;
}
if (is8Bit()) {
LChar buffer[maxLengthForOnStackResolve];
resolveRopeInternal8(buffer);
m_value = AtomicString(buffer, length());
setIs8Bit(m_value.impl()->is8Bit());
} else {
UChar buffer[maxLengthForOnStackResolve];
resolveRopeInternal16(buffer);
m_value = AtomicString(buffer, length());
setIs8Bit(m_value.impl()->is8Bit());
}
clearFibers();
// If we resolved a string that didn't previously exist, notify the heap that we've grown.
if (m_value.impl()->hasOneRef())
Heap::heap(this)->reportExtraMemoryAllocated(m_value.impl()->cost());
}
void JSRopeString::outOfMemory(ExecState* exec) const
{
clearFibers();
ASSERT(isRope());
ASSERT(m_value.isNull());
if (exec)
throwOutOfMemoryError(exec);
}
void JSRopeString::outOfMemory(ExecState* exec) const
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
clearFibers();
ASSERT(isRope());
ASSERT(m_value.isNull());
if (exec)
throwOutOfMemoryError(exec, scope);
}
void JSRopeString::resolveRope(ExecState* exec) const
{
ASSERT(isRope());
if (isSubstring()) {
ASSERT(!substringBase()->isRope());
m_value = substringBase()->m_value.substringSharingImpl(substringOffset(), length());
substringBase().clear();
return;
}
if (is8Bit()) {
LChar* buffer;
if (auto newImpl = StringImpl::tryCreateUninitialized(length(), buffer)) {
Heap::heap(this)->reportExtraMemoryAllocated(newImpl->cost());
m_value = WTFMove(newImpl);
} else {
outOfMemory(exec);
return;
}
resolveRopeInternal8NoSubstring(buffer);
clearFibers();
ASSERT(!isRope());
return;
}
UChar* buffer;
if (auto newImpl = StringImpl::tryCreateUninitialized(length(), buffer)) {
Heap::heap(this)->reportExtraMemoryAllocated(newImpl->cost());
m_value = WTFMove(newImpl);
} else {
outOfMemory(exec);
return;
}
resolveRopeInternal16NoSubstring(buffer);
clearFibers();
ASSERT(!isRope());
}
