PassOwnPtr<v8::ScriptData> V8Proxy::precompileScript(v8::Handle<v8::String> code, CachedScript* cachedScript)
{
// A pseudo-randomly chosen ID used to store and retrieve V8 ScriptData from
// the CachedScript. If the format changes, this ID should be changed too.
static const unsigned dataTypeID = 0xECC13BD7;
// Very small scripts are not worth the effort to preparse.
static const int minPreparseLength = 1024;
if (!cachedScript || code->Length() < minPreparseLength)
return 0;
CachedMetadata* cachedMetadata = cachedScript->cachedMetadata(dataTypeID);
if (cachedMetadata)
return v8::ScriptData::New(cachedMetadata->data(), cachedMetadata->size());
OwnPtr<v8::ScriptData> scriptData(v8::ScriptData::PreCompile(code));
cachedScript->setCachedMetadata(dataTypeID, scriptData->Data(), scriptData->Length());
return scriptData.release();
}
v8::Local<v8::Script> V8ScriptRunner::compileScript(v8::Handle<v8::String> code, const String& fileName, const TextPosition& scriptStartPosition, ScriptResource* resource, v8::Isolate* isolate, AccessControlStatus corsStatus)
{
// A pseudo-randomly chosen ID used to store and retrieve V8 ScriptData from
// the ScriptResource. If the format changes, this ID should be changed too.
static const unsigned dataTypeID = 0xECC13BD7;
// Very small scripts are not worth the effort to store cached data.
static const int minLengthForCachedData = 1024;
TRACE_EVENT0("v8", "v8.compile");
TRACE_EVENT_SCOPED_SAMPLING_STATE("V8", "V8Compile");
// NOTE: For compatibility with WebCore, ScriptSourceCode's line starts at
// 1, whereas v8 starts at 0.
v8::Handle<v8::String> name = v8String(isolate, fileName);
v8::Handle<v8::Integer> line = v8::Integer::New(isolate, scriptStartPosition.m_line.zeroBasedInt());
v8::Handle<v8::Integer> column = v8::Integer::New(isolate, scriptStartPosition.m_column.zeroBasedInt());
v8::Handle<v8::Boolean> isSharedCrossOrigin = corsStatus == SharableCrossOrigin ? v8::True(isolate) : v8::False(isolate);
v8::ScriptOrigin origin(name, line, column, isSharedCrossOrigin);
v8::ScriptCompiler::CompileOptions options = v8::ScriptCompiler::kNoCompileOptions;
OwnPtr<v8::ScriptCompiler::CachedData> cachedData;
if (resource) {
CachedMetadata* cachedMetadata = resource->cachedMetadata(dataTypeID);
if (cachedMetadata) {
// Ownership of the buffer is not transferred to CachedData.
cachedData = adoptPtr(new v8::ScriptCompiler::CachedData(reinterpret_cast<const uint8_t*>(cachedMetadata->data()), cachedMetadata->size()));
} else if (code->Length() >= minLengthForCachedData) {
options = v8::ScriptCompiler::kProduceDataToCache;
}
}
// source takes ownership of cachedData.
v8::ScriptCompiler::Source source(code, origin, cachedData.leakPtr());
v8::Local<v8::Script> script = v8::ScriptCompiler::Compile(isolate, &source, options);
if (options == v8::ScriptCompiler::kProduceDataToCache) {
const v8::ScriptCompiler::CachedData* newCachedData = source.GetCachedData();
if (newCachedData) {
// Ownership of the buffer is not transferred; source's cachedData continues to own it.
resource->setCachedMetadata(dataTypeID, reinterpret_cast<const char*>(newCachedData->data), newCachedData->length);
}
}
return script;
}