gecko-dev/widget/android/ANRReporter.cpp

88 строки
2.5 KiB
C++

/* -*- Mode: c++; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ANRReporter.h"
#include "GeckoProfiler.h"
#include <unistd.h>
namespace mozilla {
bool
ANRReporter::RequestNativeStack(bool aUnwind)
{
#ifdef MOZ_GECKO_PROFILER
if (profiler_is_active()) {
// Don't proceed if profiler is already running
return false;
}
// WARNING: we are on the ANR reporter thread at this point and it is
// generally unsafe to use the profiler from off the main thread. However,
// the risk here is limited because for most users, the profiler is not run
// elsewhere. See the discussion in Bug 863777, comment 13
uint32_t features = ProfilerFeature::Leaf |
ProfilerFeature::Privacy |
(aUnwind ? ProfilerFeature::StackWalk : 0) |
ProfilerFeature::Threads;
const char *NATIVE_STACK_THREADS[] = {"GeckoMain", "Compositor"};
// Buffer one sample and let the profiler wait a long time
profiler_start(/* entries */ 100, /* interval */ 10000, features,
NATIVE_STACK_THREADS,
sizeof(NATIVE_STACK_THREADS) / sizeof(char*));
#endif
return true;
}
jni::String::LocalRef
ANRReporter::GetNativeStack()
{
#ifdef MOZ_GECKO_PROFILER
// Timeout if we don't get a profiler sample after 5 seconds.
const PRIntervalTime timeout = PR_SecondsToInterval(5);
const PRIntervalTime startTime = PR_IntervalNow();
// Pointer to a profile JSON string
typedef mozilla::UniquePtr<char[]> ProfilePtr;
// profiler_get_profile() will return nullptr if the profiler is inactive.
ProfilePtr profile(profiler_get_profile());
if (!profile) {
return nullptr;
}
while (profile && !strstr(profile.get(), "\"samples\":[{")) {
// no sample yet?
if (PR_IntervalNow() - startTime >= timeout) {
return nullptr;
}
usleep(100000ul); // Sleep for 100ms
profile = ProfilePtr(profiler_get_profile());
}
if (profile) {
return jni::String::Param(profile.get());
}
#endif
return nullptr;
}
void
ANRReporter::ReleaseNativeStack()
{
#ifdef MOZ_GECKO_PROFILER
if (!profiler_is_active()) {
// Maybe profiler support is disabled?
return;
}
profiler_stop();
#endif
}
} // namespace