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ea25e62e3c
Currently the profiler mostly uses an array of strings to represent which features are available and in use. This patch changes the profiler core to use a uint32_t bitfield, which is a much simpler and faster representation. (nsProfiler and the profiler add-on still use the array of strings, alas.) The new ProfilerFeature type defines the values in the bitfield. One side-effect of this change is that profiler_feature_active() now can be used to query all features. Previously it was just a subset. Another side-effect is that profiler_get_available_features() no longer incorrectly indicates support for Java and stack-walking when they aren't supported. (The handling of task tracer support is unchanged, because the old code handled it correctly.)
83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
/* -*- Mode: c++; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ANRReporter.h"
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#include "GeckoProfiler.h"
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#include <unistd.h>
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namespace mozilla {
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bool
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ANRReporter::RequestNativeStack(bool aUnwind)
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{
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if (profiler_is_active()) {
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// Don't proceed if profiler is already running
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return false;
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}
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// WARNING: we are on the ANR reporter thread at this point and it is
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// generally unsafe to use the profiler from off the main thread. However,
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// the risk here is limited because for most users, the profiler is not run
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// elsewhere. See the discussion in Bug 863777, comment 13
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uint32_t features = ProfilerFeature::Leaf |
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ProfilerFeature::Privacy |
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(aUnwind ? ProfilerFeature::StackWalk : 0) |
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ProfilerFeature::Threads;
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const char *NATIVE_STACK_THREADS[] = {"GeckoMain", "Compositor"};
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// Buffer one sample and let the profiler wait a long time
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profiler_start(/* entries */ 100, /* interval */ 10000, features,
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NATIVE_STACK_THREADS,
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sizeof(NATIVE_STACK_THREADS) / sizeof(char*));
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return true;
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}
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jni::String::LocalRef
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ANRReporter::GetNativeStack()
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{
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// Timeout if we don't get a profiler sample after 5 seconds.
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const PRIntervalTime timeout = PR_SecondsToInterval(5);
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const PRIntervalTime startTime = PR_IntervalNow();
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// Pointer to a profile JSON string
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typedef mozilla::UniquePtr<char[]> ProfilePtr;
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// profiler_get_profile() will return nullptr if the profiler is disabled
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// or inactive.
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ProfilePtr profile(profiler_get_profile());
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if (!profile) {
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return nullptr;
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}
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while (profile && !strstr(profile.get(), "\"samples\":[{")) {
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// no sample yet?
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if (PR_IntervalNow() - startTime >= timeout) {
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return nullptr;
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}
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usleep(100000ul); // Sleep for 100ms
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profile = ProfilePtr(profiler_get_profile());
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}
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if (profile) {
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return jni::String::Param(profile.get());
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}
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return nullptr;
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}
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void
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ANRReporter::ReleaseNativeStack()
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{
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if (!profiler_is_active()) {
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// Maybe profiler support is disabled?
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return;
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}
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profiler_stop();
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}
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} // namespace
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