StringType v8StringToWebCoreString(v8::Handle<v8::String> v8String, ExternalMode external)
{
{
// This portion of this function is very hot in certain Dromeao benchmarks.
v8::String::Encoding encoding;
v8::String::ExternalStringResourceBase* resource = v8String->GetExternalStringResourceBase(&encoding);
if (LIKELY(!!resource)) {
WebCoreStringResourceBase* base;
if (encoding == v8::String::ONE_BYTE_ENCODING)
base = static_cast<WebCoreStringResource8*>(resource);
else
base = static_cast<WebCoreStringResource16*>(resource);
return StringTraits<StringType>::fromStringResource(base);
}
}
int length = v8String->Length();
if (UNLIKELY(!length))
return StringType("");
bool oneByte = v8String->ContainsOnlyOneByte();
StringType result(oneByte ? StringTraits<StringType>::template fromV8String<V8StringOneByteTrait>(v8String, length) : StringTraits<StringType>::template fromV8String<V8StringTwoBytesTrait>(v8String, length));
if (external != Externalize || !v8String->CanMakeExternal())
return result;
if (result.is8Bit()) {
WebCoreStringResource8* stringResource = new WebCoreStringResource8(result);
if (UNLIKELY(!v8String->MakeExternal(stringResource)))
delete stringResource;
} else {
WebCoreStringResource16* stringResource = new WebCoreStringResource16(result);
if (UNLIKELY(!v8String->MakeExternal(stringResource)))
delete stringResource;
}
return result;
}
StringType v8StringToWebCoreString(v8::Handle<v8::String> v8String, ExternalMode external)
{
WebCoreStringResource* stringResource = WebCoreStringResource::toStringResource(v8String);
if (stringResource)
return StringTraits<StringType>::fromStringResource(stringResource);
int length = v8String->Length();
if (!length)
return String("");
StringType result(StringTraits<StringType>::fromV8String(v8String, length));
if (external == Externalize && v8String->CanMakeExternal()) {
stringResource = new WebCoreStringResource(result);
if (!v8String->MakeExternal(stringResource)) {
// In case of a failure delete the external resource as it was not used.
delete stringResource;
}
}
return result;
}
StringType v8StringToWebCoreString(v8::Handle<v8::String> v8String, ExternalMode external)
{
WebCoreStringResource* stringResource = WebCoreStringResource::toStringResource(v8String);
if (stringResource)
return StringTraits<StringType>::fromStringResource(stringResource);
int length = v8String->Length();
if (!length) {
// Avoid trying to morph empty strings, as they do not have enough room to contain the external reference.
return StringImpl::empty();
}
StringType result(StringTraits<StringType>::fromV8String(v8String, length));
if (external == Externalize && v8String->CanMakeExternal()) {
stringResource = new WebCoreStringResource(result);
if (!v8String->MakeExternal(stringResource)) {
// In case of a failure delete the external resource as it was not used.
delete stringResource;
}
}
return result;
}