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/* -*- 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)
{
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
const char *NATIVE_STACK_FEATURES[] =
{"leaf", "threads", "privacy"};
const char *NATIVE_STACK_UNWIND_FEATURES[] =
{"leaf", "threads", "privacy", "stackwalk"};
const char **features = NATIVE_STACK_FEATURES;
size_t features_size = sizeof(NATIVE_STACK_FEATURES);
if (aUnwind) {
features = NATIVE_STACK_UNWIND_FEATURES;
features_size = sizeof(NATIVE_STACK_UNWIND_FEATURES);
// We want the new unwinder if the unwind mode has not been set yet
putenv("MOZ_PROFILER_NEW=1");
}
const char *NATIVE_STACK_THREADS[] =
{"GeckoMain", "Compositor"};
// Buffer one sample and let the profiler wait a long time
profiler_start(100, 10000, features, features_size / sizeof(char*),
NATIVE_STACK_THREADS, sizeof(NATIVE_STACK_THREADS) / sizeof(char*));
return true;
}
jni::String::LocalRef
ANRReporter::GetNativeStack()
{
if (!profiler_is_active()) {
// Maybe profiler support is disabled?
return nullptr;
}
// 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;
ProfilePtr profile(profiler_get_profile());
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());
}
return nullptr;
}
void
ANRReporter::ReleaseNativeStack()
{
if (!profiler_is_active()) {
// Maybe profiler support is disabled?
return;
}
profiler_stop();
}
} // namespace
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