TEST_F(ScriptStreamingTest, SuppressingStreaming)
{
// If we notice during streaming that there is a code cache, streaming
// is suppressed (V8 doesn't parse while the script is loading), and the
// upper layer (ScriptResourceClient) should get a notification when the
// script is loaded.
ScriptStreamer::startStreaming(pendingScript(), m_settings.get(), m_scope.scriptState(), PendingScript::ParsingBlocking);
TestScriptResourceClient client;
pendingScript().watchForLoad(&client);
appendData("function foo() {");
appendPadding();
m_resource->setCachedMetadata(V8ScriptRunner::tagForCodeCache(), "X", 1, Resource::CacheLocally);
appendPadding();
finish();
processTasksUntilStreamingComplete();
EXPECT_TRUE(client.finished());
bool errorOccurred = false;
ScriptSourceCode sourceCode = pendingScript().getSource(KURL(), errorOccurred);
EXPECT_FALSE(errorOccurred);
// ScriptSourceCode doesn't refer to the streamer, since we have suppressed
// the streaming and resumed the non-streaming code path for script
// compilation.
EXPECT_FALSE(sourceCode.streamer());
}
TEST_F(ScriptStreamingTest, CompilingStreamedScript)
{
// Test that we can successfully compile a streamed script.
ScriptStreamer::startStreaming(pendingScript(), m_settings.get(), m_scope.scriptState(), PendingScript::ParsingBlocking);
TestScriptResourceClient client;
pendingScript().watchForLoad(&client);
appendData("function foo() {");
appendPadding();
appendData("return 5; }");
appendPadding();
appendData("foo();");
EXPECT_FALSE(client.finished());
finish();
// Process tasks on the main thread until the streaming background thread
// has completed its tasks.
processTasksUntilStreamingComplete();
EXPECT_TRUE(client.finished());
bool errorOccurred = false;
ScriptSourceCode sourceCode = pendingScript().getSource(KURL(), errorOccurred);
EXPECT_FALSE(errorOccurred);
EXPECT_TRUE(sourceCode.streamer());
v8::TryCatch tryCatch;
v8::Handle<v8::Script> script = V8ScriptRunner::compileScript(sourceCode, isolate());
EXPECT_FALSE(script.IsEmpty());
EXPECT_FALSE(tryCatch.HasCaught());
}
TEST_F(ScriptStreamingTest, CompilingStreamedScriptWithParseError)
{
// Test that scripts with parse errors are handled properly. In those cases,
// the V8 side typically finished before loading finishes: make sure we
// handle it gracefully.
ScriptStreamer::startStreaming(pendingScript(), m_settings.get(), m_scope.scriptState(), PendingScript::ParsingBlocking);
TestScriptResourceClient client;
pendingScript().watchForLoad(&client);
appendData("function foo() {");
appendData("this is the part which will be a parse error");
// V8 won't realize the parse error until it actually starts parsing the
// script, and this happens only when its buffer is filled.
appendPadding();
EXPECT_FALSE(client.finished());
// Force the V8 side to finish before the loading.
processTasksUntilStreamingComplete();
EXPECT_FALSE(client.finished());
finish();
EXPECT_TRUE(client.finished());
bool errorOccurred = false;
ScriptSourceCode sourceCode = pendingScript().getSource(KURL(), errorOccurred);
EXPECT_FALSE(errorOccurred);
EXPECT_TRUE(sourceCode.streamer());
v8::TryCatch tryCatch;
v8::Handle<v8::Script> script = V8ScriptRunner::compileScript(sourceCode, isolate());
EXPECT_TRUE(script.IsEmpty());
EXPECT_TRUE(tryCatch.HasCaught());
}
TEST_F(ScriptStreamingTest, EmptyScripts)
{
// Empty scripts should also be streamed properly, that is, the upper layer
// (ScriptResourceClient) should be notified when an empty script has been
// loaded.
ScriptStreamer::startStreaming(pendingScript(), m_settings.get(), m_scope.scriptState(), PendingScript::ParsingBlocking);
TestScriptResourceClient client;
pendingScript().watchForLoad(&client);
// Finish the script without sending any data.
finish();
// The finished notification should arrive immediately and not be cycled
// through a background thread.
EXPECT_TRUE(client.finished());
bool errorOccurred = false;
ScriptSourceCode sourceCode = pendingScript().getSource(KURL(), errorOccurred);
EXPECT_FALSE(errorOccurred);
EXPECT_FALSE(sourceCode.streamer());
}
v8::MaybeLocal<v8::Script> V8ScriptRunner::compileScript(const ScriptSourceCode& source, v8::Isolate* isolate, AccessControlStatus corsStatus, V8CacheOptions cacheOptions)
{
if (source.source().length() >= v8::String::kMaxLength) {
V8ThrowException::throwGeneralError(isolate, "Source file too large.");
return v8::Local<v8::Script>();
}
return compileScript(v8String(isolate, source.source()), source.url(), source.sourceMapUrl(), source.startPosition(), isolate, source.resource(), source.streamer(), source.resource() ? source.resource()->cacheHandler() : nullptr, corsStatus, cacheOptions);
}