зеркало из https://github.com/mozilla/gecko-dev.git
130 строки
4.3 KiB
C++
130 строки
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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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#ifndef __PROFILER_BACKTRACE_H
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#define __PROFILER_BACKTRACE_H
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#include "mozilla/UniquePtrExtensions.h"
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namespace mozilla {
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class ProfileChunkedBuffer;
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class TimeStamp;
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namespace baseprofiler {
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class ProfileBuffer;
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class SpliceableJSONWriter;
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class ThreadInfo;
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class UniqueStacks;
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// ProfilerBacktrace encapsulates a synchronous sample.
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class ProfilerBacktrace {
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public:
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ProfilerBacktrace(const char* aName, int aThreadId,
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UniquePtr<ProfileChunkedBuffer> aProfileChunkedBuffer,
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UniquePtr<ProfileBuffer> aProfileBuffer);
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~ProfilerBacktrace();
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// ProfilerBacktraces' stacks are deduplicated in the context of the
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// profile that contains the backtrace as a marker payload.
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//
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// That is, markers that contain backtraces should not need their own stack,
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// frame, and string tables. They should instead reuse their parent
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// profile's tables.
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void StreamJSON(SpliceableJSONWriter& aWriter,
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const TimeStamp& aProcessStartTime,
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UniqueStacks& aUniqueStacks);
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private:
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// Used to de/serialize a ProfilerBacktrace.
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friend struct ProfileBufferEntryWriter::Serializer<ProfilerBacktrace>;
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friend struct ProfileBufferEntryReader::Deserializer<ProfilerBacktrace>;
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UniqueFreePtr<char> mName;
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int mThreadId;
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// `ProfileChunkedBuffer` in which `mProfileBuffer` stores its data; must be
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// located before `mProfileBuffer` so that it's destroyed after.
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UniquePtr<ProfileChunkedBuffer> mProfileChunkedBuffer;
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UniquePtr<ProfileBuffer> mProfileBuffer;
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};
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} // namespace baseprofiler
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// Format: [ UniquePtr<BlockRingsBuffer> | threadId | name ]
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// Initial len==0 marks a nullptr or empty backtrace.
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template <>
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struct ProfileBufferEntryWriter::Serializer<baseprofiler::ProfilerBacktrace> {
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static Length Bytes(const baseprofiler::ProfilerBacktrace& aBacktrace) {
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if (!aBacktrace.mProfileBuffer) {
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// No backtrace buffer.
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return ULEB128Size<Length>(0);
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}
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auto bufferBytes = SumBytes(*aBacktrace.mProfileChunkedBuffer);
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if (bufferBytes == 0) {
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// Empty backtrace buffer.
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return ULEB128Size<Length>(0);
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}
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return bufferBytes +
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SumBytes(aBacktrace.mThreadId,
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WrapProfileBufferUnownedCString(aBacktrace.mName.get()));
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}
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static void Write(ProfileBufferEntryWriter& aEW,
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const baseprofiler::ProfilerBacktrace& aBacktrace) {
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if (!aBacktrace.mProfileBuffer ||
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SumBytes(aBacktrace.mProfileChunkedBuffer) == 0) {
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// No backtrace buffer, or it is empty.
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aEW.WriteULEB128<Length>(0);
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return;
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}
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aEW.WriteObject(aBacktrace.mProfileChunkedBuffer);
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aEW.WriteObject(aBacktrace.mThreadId);
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aEW.WriteObject(WrapProfileBufferUnownedCString(aBacktrace.mName.get()));
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}
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};
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template <typename Destructor>
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struct ProfileBufferEntryWriter::Serializer<
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UniquePtr<baseprofiler::ProfilerBacktrace, Destructor>> {
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static Length Bytes(const UniquePtr<baseprofiler::ProfilerBacktrace,
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Destructor>& aBacktrace) {
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if (!aBacktrace) {
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// Null backtrace pointer (treated like an empty backtrace).
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return ULEB128Size<Length>(0);
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}
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return SumBytes(*aBacktrace);
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}
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static void Write(ProfileBufferEntryWriter& aEW,
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const UniquePtr<baseprofiler::ProfilerBacktrace,
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Destructor>& aBacktrace) {
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if (!aBacktrace) {
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// Null backtrace pointer (treated like an empty backtrace).
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aEW.WriteULEB128<Length>(0);
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return;
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}
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aEW.WriteObject(*aBacktrace);
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}
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};
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template <typename Destructor>
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struct ProfileBufferEntryReader::Deserializer<
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UniquePtr<baseprofiler::ProfilerBacktrace, Destructor>> {
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static void ReadInto(
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ProfileBufferEntryReader& aER,
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UniquePtr<baseprofiler::ProfilerBacktrace, Destructor>& aBacktrace) {
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aBacktrace = Read(aER);
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}
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static UniquePtr<baseprofiler::ProfilerBacktrace, Destructor> Read(
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ProfileBufferEntryReader& aER);
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};
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} // namespace mozilla
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#endif // __PROFILER_BACKTRACE_H
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