void SamplingProfiler::dispatchIfNecessary(const LockHolder& locker)
{
if (m_isActive && !m_hasDispatchedFunction && m_jscExecutionThread && m_vm.entryScope) {
ref(); // Matching deref() is inside m_handler when m_handler stops recursing.
dispatchFunction(locker);
}
}
void BatchingUIManager::measure(folly::dynamic&& args, facebook::xplat::module::CxxModule::Callback cb)
{
auto manager = shared_from_this();
dispatchFunction([manager, args, cb]()
{
static_cast<IUIManager*>(manager.get())->measure(jsArgAsInt(args, 0), cb);
});
}
void BatchingUIManager::removeRootView(folly::dynamic&& args)
{
auto manager = std::static_pointer_cast<UIManager>(shared_from_this());
dispatchFunction([manager, args]()
{
manager->removeRootView(jsArgAsInt(args, 0));
});
}
void BatchingUIManager::replaceExistingNonRootView(folly::dynamic&& args)
{
auto manager = shared_from_this();
dispatchFunction([manager, args]()
{
static_cast<IUIManager*>(manager.get())->replaceExistingNonRootView(jsArgAsInt(args, 0), jsArgAsInt(args, 1));
});
}
void BatchingUIManager::removeSubviewsFromContainerWithID(folly::dynamic&& args)
{
auto manager = shared_from_this();
dispatchFunction([manager, args]()
{
static_cast<IUIManager*>(manager.get())->removeSubviewsFromContainerWithID(jsArgAsInt(args, 0));
});
}
void BatchingUIManager::createView(folly::dynamic&& args)
{
auto manager = shared_from_this();
dispatchFunction([manager, args]()
{
auto arg3 = jsArgAsDynamic(args, 3);
static_cast<IUIManager*>(manager.get())->createView(jsArgAsInt(args, 0), jsArgAsString(args, 1), jsArgAsInt(args, 2), std::move(arg3));
});
}
void BatchingUIManager::configureNextLayoutAnimation(folly::dynamic&& args, facebook::xplat::module::CxxModule::Callback success, facebook::xplat::module::CxxModule::Callback error)
{
auto manager = shared_from_this();
dispatchFunction([manager, args, success, error]()
{
auto config = jsArgAsDynamic(args, 3);
manager->configureNextLayoutAnimation(std::move(config), success, error);
});
}
void BatchingUIManager::dispatchViewManagerCommand(folly::dynamic&& args)
{
auto manager = shared_from_this();
dispatchFunction([manager, args]()
{
auto arg2 = jsArgAsDynamic(args, 2);
static_cast<IUIManager*>(manager.get())->dispatchViewManagerCommand(jsArgAsInt(args, 0), jsArgAsInt(args, 1), std::move(arg2));
});
}
void BatchingUIManager::setChildren(folly::dynamic&& args)
{
auto manager = shared_from_this();
dispatchFunction([manager, args]()
{
auto arg1 = jsArgAsArray(args, 1);
static_cast<IUIManager*>(manager.get())->setChildren(jsArgAsInt(args, 0), std::move(arg1));
});
}
void BatchingUIManager::manageChildren(folly::dynamic&& args)
{
auto manager = shared_from_this();
dispatchFunction([manager, args]()
{
auto arg1 = jsArgAsDynamic(args, 1);
auto arg2 = jsArgAsDynamic(args, 2);
auto arg3 = jsArgAsDynamic(args, 3);
auto arg4 = jsArgAsDynamic(args, 4);
auto arg5 = jsArgAsDynamic(args, 5);
static_cast<IUIManager*>(manager.get())->manageChildren(jsArgAsInt(args, 0), arg1, arg2, arg3, arg4, arg5);
});
}
SamplingProfiler::SamplingProfiler(VM& vm, RefPtr<Stopwatch>&& stopwatch)
: m_vm(vm)
, m_stopwatch(WTFMove(stopwatch))
, m_indexOfNextStackTraceToVerify(0)
, m_timingInterval(std::chrono::microseconds(1000))
, m_totalTime(0)
, m_timerQueue(WorkQueue::create("jsc.sampling-profiler.queue", WorkQueue::Type::Serial, WorkQueue::QOS::UserInteractive))
, m_jscExecutionThread(nullptr)
, m_isActive(false)
, m_isPaused(false)
, m_hasDispatchedFunction(false)
{
if (sReportStats) {
sNumTotalWalks = 0;
sNumFailedWalks = 0;
}
m_currentFrames.grow(256);
m_handler = [this] () {
LockHolder samplingProfilerLocker(m_lock);
if (!m_isActive || !m_jscExecutionThread || m_isPaused) {
m_hasDispatchedFunction = false;
deref();
return;
}
if (m_vm.entryScope) {
double nowTime = m_stopwatch->elapsedTime();
LockHolder machineThreadsLocker(m_vm.heap.machineThreads().getLock());
LockHolder codeBlockSetLocker(m_vm.heap.codeBlockSet().getLock());
LockHolder executableAllocatorLocker(m_vm.executableAllocator.getLock());
bool didSuspend = m_jscExecutionThread->suspend();
if (didSuspend) {
// While the JSC thread is suspended, we can't do things like malloc because the JSC thread
// may be holding the malloc lock.
ExecState* callFrame;
void* pc;
{
MachineThreads::Thread::Registers registers;
m_jscExecutionThread->getRegisters(registers);
callFrame = static_cast<ExecState*>(registers.framePointer());
pc = registers.instructionPointer();
m_jscExecutionThread->freeRegisters(registers);
}
// FIXME: Lets have a way of detecting when we're parsing code.
// https://bugs.webkit.org/show_bug.cgi?id=152761
if (m_vm.executableAllocator.isValidExecutableMemory(executableAllocatorLocker, pc)) {
if (m_vm.isExecutingInRegExpJIT) {
// FIXME: We're executing a regexp. Lets gather more intersting data.
// https://bugs.webkit.org/show_bug.cgi?id=152729
callFrame = m_vm.topCallFrame; // We need to do this or else we'd fail our backtrace validation b/c this isn't a JS frame.
}
} else if (LLInt::isLLIntPC(pc)) {
// We're okay to take a normal stack trace when the PC
// is in LLInt code.
} else {
// We resort to topCallFrame to see if we can get anything
// useful. We usually get here when we're executing C code.
callFrame = m_vm.topCallFrame;
}
size_t walkSize;
bool wasValidWalk;
bool didRunOutOfVectorSpace;
bool stacktraceNeedsVerification;
{
FrameWalker walker(callFrame, m_vm, codeBlockSetLocker, machineThreadsLocker);
walkSize = walker.walk(m_currentFrames, didRunOutOfVectorSpace, stacktraceNeedsVerification);
wasValidWalk = walker.wasValidWalk();
}
m_jscExecutionThread->resume();
// We can now use data structures that malloc, and do other interesting things, again.
// FIXME: It'd be interesting to take data about the program's state when
// we fail to take a stack trace: https://bugs.webkit.org/show_bug.cgi?id=152758
if (wasValidWalk && walkSize) {
if (sReportStats) {
sNumTotalStackTraces++;
if (stacktraceNeedsVerification)
sNumUnverifiedStackTraces++;
}
Vector<StackFrame> stackTrace;
stackTrace.reserveInitialCapacity(walkSize);
for (size_t i = 0; i < walkSize; i++) {
StackFrame frame = m_currentFrames[i];
stackTrace.uncheckedAppend(frame);
if (frame.frameType == FrameType::VerifiedExecutable)
m_seenExecutables.add(frame.u.verifiedExecutable);
}
m_stackTraces.append(StackTrace{ stacktraceNeedsVerification, nowTime, WTFMove(stackTrace) });
if (didRunOutOfVectorSpace)
m_currentFrames.grow(m_currentFrames.size() * 1.25);
m_totalTime += nowTime - m_lastTime;
}
}
}
m_lastTime = m_stopwatch->elapsedTime();
dispatchFunction(samplingProfilerLocker);
};
}
