filter-stacks.py

#!/bin/env python
import json
import sys

skipList = [
    "BaseThreadInitThunk",
    "CharPrevA",
    "CsrAllocateMessagePointer",
    "DispatchMessageW",
    "DispatchMessageWorker",
    "EtwEventEnabled",
    "GetCurrentThread",
    "GetTickCount",
    "KiFastSystemCallRet",
    "MessageLoop::Run",
    "MessageLoop::RunHandler",
    "MsgWaitForMultipleObjects",
    "MsgWaitForMultipleObjectsEx",
    "NS_ProcessNextEvent",
    "NS_internal_main",
    "NtUserValidateHandleSecure",
    "NtWaitForAlertByThreadId",
    "NtWaitForMultipleObjects",
    "NtWaitForSingleObject",
    "PR_Lock",
    "PeekMessageW",
    "RealMsgWaitForMultipleObjectsEx",
    "RtlAnsiStringToUnicodeString",
    "RtlDeNormalizeProcessParams",
    "RtlEnterCriticalSection",
    "RtlLeaveCriticalSection",
    "RtlUserThreadStart",
    "RtlpAllocateListLookup",
    "RtlpDeCommitFreeBlock",
    "RtlpEnterCriticalSectionContended",
    "RtlpUnWaitCriticalSection",
    "RtlpWaitOnAddress",
    "RtlpWaitOnAddressWithTimeout",
    "RtlpWaitOnCriticalSection",
    "RtlpWakeByAddress",
    "UserCallWinProcCheckWow"
    "ValidateHwnd",
    "WaitForMultipleObjectsEx",
    "WaitForMultipleObjectsExImplementation",
    "WaitForSingleObjectEx",
    "XRE_InitChildProcess",
    "XRE_RunAppShell",
    "ZwWaitForMultipleObjects",
    "ZwWaitForSingleObject",
    "_RtlUserThreadStart",
    "__RtlUserThreadStart",
    "__scrt_common_main_seh",
    "content_process_main",
    "mozilla::BackgroundHangMonitor::NotifyActivity",
    "mozilla::BackgroundHangThread::NotifyActivity",
    "mozilla::BackgroundHangThread::NotifyWait",
    "mozilla::BootstrapImpl::XRE_InitChildProcess",
    "mozilla::HangMonitor::NotifyActivity",
    "mozilla::HangMonitor::Suspend",
    "mozilla::ValidatingDispatcher::Runnable::Run",
    "mozilla::detail::MutexImpl::lock",
    "mozilla::ipc::MessageChannel::MessageTask::Run",
    "mozilla::ipc::MessagePump::Run",
    "mozilla::ipc::MessagePumpForChildProcess::Run",
    "mozilla::widget::WinUtils::PeekMessageW",
    "mozilla::widget::WinUtils::WaitForMessage",
    "nsAppShell::ProcessNextNativeEvent",
    "nsAppShell::Run",
    "nsBaseAppShell::DoProcessNextNativeEvent",
    "nsBaseAppShell::OnProcessNextEvent",
    "nsBaseAppShell::Run",
    "nsThread::DoMainThreadSpecificProcessing",
    "nsThread::ProcessNextEvent",
    "wmain",
    "UserCallWinProcCheckWow",
    "ValidateHwnd",
    "0x1bc3d",
    "0x1905a",
    "RtlSleepConditionVariableCS",
    "SleepConditionVariableCS",
    "NDXGI::CDevice::GetKernelDeviceExecutionState",
    "NtGdiDdDDIGetDeviceState",
]

def shouldSkip(frame):
    for item in skipList:
        if frame.startswith(item):
            return True
    return False

def filterStacks(stacks):
    newstacks = []
    for frame in stacks:
        if shouldSkip(frame):
            continue
        newstacks.append(frame)
    return newstacks

if __name__ == "__main__":
    input = sys.argv[1]
    data = json.load(open(input))
    ranks = {}
    for record in data:
        stacks = filterStacks(record['nativeStack']['symbolicatedStacks'][0])
        key = ''.join(stacks)
        if stacks:
            if not ranks.has_key(key):
                ranks[key] = []
            ranks[key].append(stacks)
    for r in sorted(ranks.itervalues(), key=lambda r: len(r), reverse=True):
        print("{}".format(len(r)))
        for frame in r[0]:
            print("  {}".format(frame))