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b2df384fc7
Instead of always taking ownership of both heap-allocated `ProfileBuffer` and `ProfileChunkedBuffer`, `ProfilerBacktrace` can now accept: - Unique pointers to both or either, similar to what it was before, so a ProfilerBacktrace can be kept for later use. - Non-owning pointers to both or either, to allow callers to use stack-based buffer(s); null pointers are allowed for totally empty backtraces. Only the `ProfileChunkedBuffer` contains the actual data, we can create a `ProfileBuffer` on the spot if not provided. Differential Revision: https://phabricator.services.mozilla.com/D86512
99 lines
4.3 KiB
C++
99 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "ProfilerBacktrace.h"
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#include "ProfileBuffer.h"
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#include "ProfiledThreadData.h"
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#include "ThreadInfo.h"
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#include "mozilla/ProfileJSONWriter.h"
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ProfilerBacktrace::ProfilerBacktrace(
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const char* aName, int aThreadId,
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mozilla::UniquePtr<mozilla::ProfileChunkedBuffer>
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aProfileChunkedBufferStorage,
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mozilla::UniquePtr<ProfileBuffer>
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aProfileBufferStorageOrNull /* = nullptr */)
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: mName(aName),
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mThreadId(aThreadId),
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mOptionalProfileChunkedBufferStorage(
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std::move(aProfileChunkedBufferStorage)),
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mProfileChunkedBuffer(mOptionalProfileChunkedBufferStorage.get()),
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mOptionalProfileBufferStorage(std::move(aProfileBufferStorageOrNull)),
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mProfileBuffer(mOptionalProfileBufferStorage.get()) {
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MOZ_COUNT_CTOR(ProfilerBacktrace);
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if (mProfileBuffer) {
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MOZ_RELEASE_ASSERT(mProfileChunkedBuffer,
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"If we take ownership of a ProfileBuffer, we must also "
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"receive ownership of a ProfileChunkedBuffer");
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MOZ_RELEASE_ASSERT(
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mProfileChunkedBuffer == &mProfileBuffer->UnderlyingChunkedBuffer(),
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"If we take ownership of a ProfileBuffer, we must also receive "
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"ownership of its ProfileChunkedBuffer");
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}
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MOZ_ASSERT(
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!mProfileChunkedBuffer || !mProfileChunkedBuffer->IsThreadSafe(),
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"ProfilerBacktrace only takes a non-thread-safe ProfileChunkedBuffer");
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}
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ProfilerBacktrace::ProfilerBacktrace(
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const char* aName, int aThreadId,
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mozilla::ProfileChunkedBuffer* aExternalProfileChunkedBuffer,
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ProfileBuffer* aExternalProfileBuffer)
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: mName(aName),
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mThreadId(aThreadId),
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mProfileChunkedBuffer(aExternalProfileChunkedBuffer),
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mProfileBuffer(aExternalProfileBuffer) {
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MOZ_COUNT_CTOR(ProfilerBacktrace);
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if (!mProfileChunkedBuffer) {
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if (mProfileBuffer) {
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// We don't have a ProfileChunkedBuffer but we have a ProfileBuffer, use
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// the latter's ProfileChunkedBuffer.
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mProfileChunkedBuffer = &mProfileBuffer->UnderlyingChunkedBuffer();
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MOZ_ASSERT(!mProfileChunkedBuffer->IsThreadSafe(),
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"ProfilerBacktrace only takes a non-thread-safe "
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"ProfileChunkedBuffer");
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}
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} else {
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if (mProfileBuffer) {
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MOZ_RELEASE_ASSERT(
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mProfileChunkedBuffer == &mProfileBuffer->UnderlyingChunkedBuffer(),
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"If we reference both ProfileChunkedBuffer and ProfileBuffer, they "
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"must already be connected");
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}
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MOZ_ASSERT(!mProfileChunkedBuffer->IsThreadSafe(),
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"ProfilerBacktrace only takes a non-thread-safe "
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"ProfileChunkedBuffer");
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}
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}
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ProfilerBacktrace::~ProfilerBacktrace() { MOZ_COUNT_DTOR(ProfilerBacktrace); }
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void ProfilerBacktrace::StreamJSON(SpliceableJSONWriter& aWriter,
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const mozilla::TimeStamp& aProcessStartTime,
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UniqueStacks& aUniqueStacks) {
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// Unlike ProfiledThreadData::StreamJSON, we don't need to call
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// ProfileBuffer::AddJITInfoForRange because ProfileBuffer does not contain
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// any JitReturnAddr entries. For synchronous samples, JIT frames get expanded
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// at sample time.
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if (mProfileBuffer) {
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StreamSamplesAndMarkers(mName.c_str(), mThreadId, *mProfileBuffer, aWriter,
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""_ns, ""_ns, aProcessStartTime,
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/* aRegisterTime */ mozilla::TimeStamp(),
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/* aUnregisterTime */ mozilla::TimeStamp(),
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/* aSinceTime */ 0, aUniqueStacks);
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} else if (mProfileChunkedBuffer) {
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ProfileBuffer profileBuffer(*mProfileChunkedBuffer);
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StreamSamplesAndMarkers(mName.c_str(), mThreadId, profileBuffer, aWriter,
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""_ns, ""_ns, aProcessStartTime,
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/* aRegisterTime */ mozilla::TimeStamp(),
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/* aUnregisterTime */ mozilla::TimeStamp(),
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/* aSinceTime */ 0, aUniqueStacks);
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}
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// If there are no buffers, the backtrace is empty and nothing is streamed.
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}
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