void HTMLScriptRunner::executePendingScriptAndDispatchEvent(PendingScript& pendingScript, PendingScriptType pendingScriptType)
{
bool errorOccurred = false;
ScriptSourceCode sourceCode = sourceFromPendingScript(pendingScript, errorOccurred);
// Stop watching loads before executeScript to prevent recursion if the script reloads itself.
if (pendingScript.resource() && pendingScript.watchingForLoad())
stopWatchingForLoad(pendingScript);
if (!isExecutingScript()) {
Microtask::performCheckpoint();
if (pendingScriptType == PendingScriptBlockingParser) {
m_hasScriptsWaitingForResources = !m_document->isScriptExecutionReady();
// The parser cannot be unblocked as a microtask requested another resource
if (m_hasScriptsWaitingForResources)
return;
}
}
// Clear the pending script before possible rentrancy from executeScript()
RefPtr<Element> element = pendingScript.releaseElementAndClear();
if (ScriptLoader* scriptLoader = toScriptLoaderIfPossible(element.get())) {
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
IgnoreDestructiveWriteCountIncrementer ignoreDestructiveWriteCountIncrementer(m_document);
if (errorOccurred)
scriptLoader->dispatchErrorEvent();
else {
ASSERT(isExecutingScript());
scriptLoader->executeScript(sourceCode);
element->dispatchEvent(createScriptLoadEvent());
}
}
ASSERT(!isExecutingScript());
}
void HTMLScriptRunner::executePendingScriptAndDispatchEvent(PendingScript& pendingScript)
{
bool errorOccurred = false;
ScriptSourceCode sourceCode = sourceFromPendingScript(pendingScript, errorOccurred);
// Stop watching loads before executeScript to prevent recursion if the script reloads itself.
if (pendingScript.cachedScript() && pendingScript.watchingForLoad())
stopWatchingForLoad(pendingScript);
if (!isExecutingScript()) {
#if ENABLE(CUSTOM_ELEMENTS)
CustomElementRegistry::deliverAllLifecycleCallbacks();
#endif
MutationObserver::deliverAllMutations();
}
// Clear the pending script before possible rentrancy from executeScript()
RefPtr<Element> element = pendingScript.releaseElementAndClear();
if (ScriptElement* scriptElement = toScriptElement(element.get())) {
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
IgnoreDestructiveWriteCountIncrementer ignoreDestructiveWriteCountIncrementer(m_document);
if (errorOccurred)
scriptElement->dispatchErrorEvent();
else {
ASSERT(isExecutingScript());
scriptElement->executeScript(sourceCode);
element->dispatchEvent(createScriptLoadEvent());
}
}
ASSERT(!isExecutingScript());
}
void HTMLScriptRunner::executePendingScriptAndDispatchEvent(PendingScript& pendingScript)
{
bool errorOccurred = false;
ScriptSourceCode sourceCode = sourceFromPendingScript(pendingScript, errorOccurred);
// Stop watching loads before executeScript to prevent recursion if the script reloads itself.
if (pendingScript.resource() && pendingScript.watchingForLoad())
stopWatchingForLoad(pendingScript);
if (!isExecutingScript())
Microtask::performCheckpoint();
// Clear the pending script before possible rentrancy from executeScript()
RefPtr<Element> element = pendingScript.releaseElementAndClear();
if (ScriptLoader* scriptLoader = toScriptLoaderIfPossible(element.get())) {
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
IgnoreDestructiveWriteCountIncrementer ignoreDestructiveWriteCountIncrementer(m_document);
if (errorOccurred)
scriptLoader->dispatchErrorEvent();
else {
ASSERT(isExecutingScript());
scriptLoader->executeScript(sourceCode);
element->dispatchEvent(createScriptLoadEvent());
}
}
ASSERT(!isExecutingScript());
}
void HTMLDocumentParser::watchForLoad(PendingScript& pendingScript)
{
ASSERT(!pendingScript.isLoaded());
// setClient would call notifyFinished if the load were complete.
// Callers do not expect to be re-entered from this call, so they should
// not an already-loaded PendingScript.
pendingScript.setClient(this);
}
bool HTMLScriptRunner::isPendingScriptReady(const PendingScript& script)
{
m_hasScriptsWaitingForResources = !m_document->haveStylesheetsAndImportsLoaded();
if (m_hasScriptsWaitingForResources)
return false;
if (script.resource() && !script.resource()->isLoaded())
return false;
return true;
}
bool HTMLScriptRunner::isPendingScriptReady(const PendingScript& script)
{
m_hasScriptsWaitingForStylesheets = !m_document->haveStylesheetsLoaded();
if (m_hasScriptsWaitingForStylesheets)
return false;
if (script.cachedScript() && !script.cachedScript()->isLoaded())
return false;
return true;
}
void HTMLScriptRunner::requestDeferredScript(Element* element)
{
PendingScript pendingScript;
if (!requestPendingScript(pendingScript, element))
return;
ASSERT(pendingScript.cachedScript());
m_scriptsToExecuteAfterParsing.append(pendingScript);
}
bool HTMLScriptRunner::isPendingScriptReady(const PendingScript& script)
{
m_hasScriptsWaitingForResources = !m_document->isScriptExecutionReady();
if (m_hasScriptsWaitingForResources)
return false;
if (script.resource() && !script.resource()->isLoaded())
return false;
return true;
}
void ScriptElement::executeScriptForScriptRunner(PendingScript& pendingScript)
{
if (auto* loadableScript = pendingScript.loadableScript())
executeScriptAndDispatchEvent(*loadableScript);
else {
ASSERT(!pendingScript.wasErrored());
executeScript(ScriptSourceCode(scriptContent(), m_element.document().url(), pendingScript.startingPosition()));
dispatchLoadEvent();
}
}
ScriptSourceCode HTMLScriptRunner::sourceFromPendingScript(const PendingScript& script, bool& errorOccurred) const
{
if (script.cachedScript()) {
errorOccurred = script.cachedScript()->errorOccurred();
ASSERT(script.cachedScript()->isLoaded());
return ScriptSourceCode(script.cachedScript());
}
errorOccurred = false;
return ScriptSourceCode(script.element()->textContent(), documentURLForScriptExecution(m_document), script.startingPosition());
}
void ScriptRunner::notifyFinished(PendingScript& pendingScript)
{
if (pendingScript.element().willExecuteInOrder())
ASSERT(!m_scriptsToExecuteInOrder.isEmpty());
else {
ASSERT(m_pendingAsyncScripts.contains(pendingScript));
m_scriptsToExecuteSoon.append(m_pendingAsyncScripts.take(pendingScript)->ptr());
}
pendingScript.clearClient();
m_timer.startOneShot(0);
}
HTMLScriptRunner::~HTMLScriptRunner()
{
// FIXME: Should we be passed a "done loading/parsing" callback sooner than destruction?
if (m_parsingBlockingScript.cachedScript() && m_parsingBlockingScript.watchingForLoad())
stopWatchingForLoad(m_parsingBlockingScript);
while (!m_scriptsToExecuteAfterParsing.isEmpty()) {
PendingScript pendingScript = m_scriptsToExecuteAfterParsing.takeFirst();
if (pendingScript.cachedScript() && pendingScript.watchingForLoad())
stopWatchingForLoad(pendingScript);
}
}
bool HTMLScriptRunner::requestPendingScript(PendingScript& pendingScript, Element* script) const
{
ASSERT(!pendingScript.element());
pendingScript.setElement(script);
// This should correctly return 0 for empty or invalid srcValues.
CachedScript* cachedScript = toScriptElement(script)->cachedScript().get();
if (!cachedScript) {
notImplemented(); // Dispatch error event.
return false;
}
pendingScript.setCachedScript(cachedScript);
return true;
}
bool HTMLScriptRunner::requestPendingScript(PendingScript& pendingScript, Element* script) const
{
ASSERT(!pendingScript.element());
pendingScript.setElement(script);
// This should correctly return 0 for empty or invalid srcValues.
ScriptResource* resource = toScriptLoaderIfPossible(script)->resource().get();
if (!resource) {
notImplemented(); // Dispatch error event.
return false;
}
pendingScript.setScriptResource(resource);
return true;
}
void HTMLScriptRunner::detach()
{
if (!m_document)
return;
m_parserBlockingScript->stopWatchingForLoad();
m_parserBlockingScript->releaseElementAndClear();
while (!m_scriptsToExecuteAfterParsing.isEmpty()) {
PendingScript* pendingScript = m_scriptsToExecuteAfterParsing.takeFirst();
pendingScript->stopWatchingForLoad();
pendingScript->releaseElementAndClear();
}
m_document = nullptr;
}
void HTMLScriptRunner::requestDeferredScript(Element* element)
{
PendingScript* pendingScript = PendingScript::create(nullptr, nullptr);
if (!requestPendingScript(pendingScript, element))
return;
if (m_document->frame() && !pendingScript->isReady()) {
ScriptState* scriptState = ScriptState::forMainWorld(m_document->frame());
if (scriptState)
ScriptStreamer::startStreaming(pendingScript, ScriptStreamer::Deferred, m_document->frame()->settings(), scriptState, m_document->loadingTaskRunner());
}
ASSERT(pendingScript->resource());
m_scriptsToExecuteAfterParsing.append(pendingScript);
}
PendingScript::PendingScript(const PendingScript& other)
: ResourceOwner(other)
, m_watchingForLoad(other.m_watchingForLoad)
, m_element(other.m_element)
, m_startingPosition(other.m_startingPosition)
, m_streamer(other.m_streamer)
{
setScriptResource(other.resource());
}
bool HTMLScriptRunner::requestPendingScript(PendingScript& pendingScript, Element* script) const
{
ASSERT(!pendingScript.element());
const AtomicString& srcValue = script->getAttribute(srcAttr);
// Allow the host to disllow script loads (using the XSSAuditor, etc.)
if (!m_host->shouldLoadExternalScriptFromSrc(srcValue))
return false;
// FIXME: We need to resolve the url relative to the element.
if (!script->dispatchBeforeLoadEvent(srcValue))
return false;
pendingScript.adoptElement(script);
// This should correctly return 0 for empty or invalid srcValues.
CachedScript* cachedScript = m_document->cachedResourceLoader()->requestScript(srcValue, toScriptElement(script)->scriptCharset());
if (!cachedScript) {
notImplemented(); // Dispatch error event.
return false;
}
pendingScript.setCachedScript(cachedScript);
return true;
}
bool ScriptStreamer::startStreamingInternal(PendingScript& script, Settings* settings, ScriptState* scriptState, PendingScript::Type scriptType)
{
ASSERT(isMainThread());
if (!settings || !settings->v8ScriptStreamingEnabled())
return false;
if (settings->v8ScriptStreamingMode() == ScriptStreamingModeOnlyAsyncAndDefer
&& scriptType == PendingScript::ParsingBlocking)
return false;
ScriptResource* resource = script.resource();
if (resource->isLoaded())
return false;
if (!resource->url().protocolIsInHTTPFamily())
return false;
if (resource->resourceToRevalidate()) {
// This happens e.g., during reloads. We're actually not going to load
// the current Resource of the PendingScript but switch to another
// Resource -> don't stream.
return false;
}
// We cannot filter out short scripts, even if we wait for the HTTP headers
// to arrive. In general, the web servers don't seem to send the
// Content-Length HTTP header for scripts.
if (!scriptState->contextIsValid())
return false;
// Decide what kind of cached data we should produce while streaming. By
// default, we generate the parser cache for streamed scripts, to emulate
// the non-streaming behavior (see V8ScriptRunner::compileScript).
v8::ScriptCompiler::CompileOptions compileOption = v8::ScriptCompiler::kProduceParserCache;
if (settings->v8CacheOptions() == V8CacheOptionsCode)
compileOption = v8::ScriptCompiler::kProduceCodeCache;
// The Resource might go out of scope if the script is no longer
// needed. This makes PendingScript notify the ScriptStreamer when it is
// destroyed.
script.setStreamer(adoptRef(new ScriptStreamer(resource, scriptType, settings->v8ScriptStreamingMode(), scriptState, compileOption)));
return true;
}
void HTMLScriptRunner::executePendingScriptAndDispatchEvent(PendingScript& pendingScript)
{
bool errorOccurred = false;
ScriptSourceCode sourceCode = sourceFromPendingScript(pendingScript, errorOccurred);
// Stop watching loads before executeScript to prevent recursion if the script reloads itself.
if (pendingScript.cachedScript() && pendingScript.watchingForLoad())
stopWatchingForLoad(pendingScript);
// WebERA: Insert HB relation between the execution of a pending script and the load of the script
if (HBIsCurrentEventActionValid() && pendingScript.cachedScript() && pendingScript.cachedScript()->isLoaded() && pendingScript.cachedScript()->getLoadingEventAction() != 0) {
HBAddExplicitArc(pendingScript.cachedScript()->getLoadingEventAction(), HBCurrentEventAction());
}
// Clear the pending script before possible rentrancy from executeScript()
RefPtr<Element> element = pendingScript.releaseElementAndClear();
if (ScriptElement* scriptElement = toScriptElement(element.get())) {
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
IgnoreDestructiveWriteCountIncrementer ignoreDestructiveWriteCountIncrementer(m_document);
if (errorOccurred)
scriptElement->dispatchErrorEvent();
else {
ASSERT(isExecutingScript());
scriptElement->executeScript(sourceCode);
element->dispatchEvent(createScriptLoadEvent());
}
}
ASSERT(!m_scriptNestingLevel);
}
bool HTMLScriptRunner::requestPendingScript(PendingScript& pendingScript, Element* script) const
{
ASSERT(!pendingScript.element());
if (V8IsolatedContext::getEntered() != 0)
{
std::ostringstream wid;
int worldID = V8IsolatedContext::getEntered()->getWorldID();
wid << worldID;
std::string aclid = wid.str()+";";
std::string aclname = "ACL";
std::string ROACLname = "ROACL";
ExceptionCode ec;
if (worldID!=0)
{
script->setAttribute("worldID",wid.str().c_str(),ec,worldID,false);
script->setAttribute(aclname.c_str(),aclid.c_str(),ec,worldID,false);
script->setAttribute(ROACLname.c_str(),aclid.c_str(),ec,worldID,false);
}
}
const AtomicString& srcValue = script->getAttribute(srcAttr);
// Allow the host to disllow script loads (using the XSSAuditor, etc.)
if (!m_host->shouldLoadExternalScriptFromSrc(srcValue))
return false;
// FIXME: We need to resolve the url relative to the element.
if (!script->dispatchBeforeLoadEvent(srcValue))
return false;
pendingScript.adoptElement(script);
// This should correctly return 0 for empty or invalid srcValues.
CachedScript* cachedScript = m_document->docLoader()->requestScript(srcValue, toScriptElement(script)->scriptCharset());
if (!cachedScript) {
notImplemented(); // Dispatch error event.
return false;
}
pendingScript.setCachedScript(cachedScript);
return true;
}
void HTMLScriptRunner::executePendingScriptAndDispatchEvent(PendingScript& pendingScript)
{
bool errorOccurred = false;
ScriptSourceCode sourceCode = sourceFromPendingScript(pendingScript, errorOccurred);
// Clear the pending script before possible rentrancy from executeScript()
RefPtr<Element> scriptElement = pendingScript.releaseElementAndClear();
{
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
if (errorOccurred)
scriptElement->dispatchEvent(createScriptErrorEvent());
else
{
executeScript(scriptElement.get(), sourceCode);
scriptElement->dispatchEvent(createScriptLoadEvent());
}
}
ASSERT(!m_scriptNestingLevel);
}
void HTMLScriptRunner::stopWatchingForLoad(PendingScript& pendingScript)
{
ASSERT(pendingScript.watchingForLoad());
m_host->stopWatchingForLoad(pendingScript.cachedScript());
pendingScript.setWatchingForLoad(false);
}
void HTMLScriptRunner::watchForLoad(PendingScript& pendingScript)
{
ASSERT(!pendingScript.watchingForLoad());
m_host->watchForLoad(pendingScript.cachedScript());
pendingScript.setWatchingForLoad(true);
}
void HTMLScriptRunner::stopWatchingForLoad(PendingScript& pendingScript)
{
ASSERT(pendingScript.watchingForLoad());
m_host.stopWatchingForLoad(pendingScript);
}
void HTMLDocumentParser::stopWatchingForLoad(PendingScript& pendingScript)
{
pendingScript.clearClient();
}