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gecko-dev/mozglue/baseprofiler/public/BaseProfilerMarkersDetail.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#ifndef BaseProfilerMarkersDetail_h
#define BaseProfilerMarkersDetail_h
#ifndef BaseProfilerMarkers_h
# error "This header should only be #included by BaseProfilerMarkers.h"
#endif
#include "mozilla/BaseProfilerMarkersPrerequisites.h"
// ~~ HERE BE DRAGONS ~~
//
// Everything below is internal implementation detail, you shouldn't need to
// look at it unless working on the profiler code.
#include "mozilla/BaseProfileJSONWriter.h"
#include "mozilla/ProfileBufferEntryKinds.h"
#include <limits>
#include <tuple>
namespace mozilla::baseprofiler {
// Implemented in platform.cpp
MFBT_API ProfileChunkedBuffer& profiler_get_core_buffer();
} // namespace mozilla::baseprofiler
namespace mozilla::base_profiler_markers_detail {
struct Streaming {
// A `MarkerDataDeserializer` is a free function that can read a serialized
// payload from an `EntryReader` and streams it as JSON object properties.
using MarkerDataDeserializer = void (*)(ProfileBufferEntryReader&,
baseprofiler::SpliceableJSONWriter&);
// A `MarkerTypeNameFunction` is a free function that returns the name of the
// marker type.
using MarkerTypeNameFunction = Span<const char> (*)();
// A `MarkerSchemaFunction` is a free function that returns a
// `MarkerSchema`, which contains all the information needed to stream
// the display schema associated with a marker type.
using MarkerSchemaFunction = MarkerSchema (*)();
struct MarkerTypeFunctions {
MarkerDataDeserializer mMarkerDataDeserializer = nullptr;
MarkerTypeNameFunction mMarkerTypeNameFunction = nullptr;
MarkerSchemaFunction mMarkerSchemaFunction = nullptr;
};
// A `DeserializerTag` will be added before the payload, to help select the
// correct deserializer when reading back the payload.
using DeserializerTag = uint8_t;
// Store a deserializer (and other marker-type-specific functions) and get its
// `DeserializerTag`.
// This is intended to be only used once per deserializer when a new marker
// type is used for the first time, so it should be called to initialize a
// `static const` tag that will be re-used by all markers of the corresponding
// payload type -- see use below.
MFBT_API static DeserializerTag TagForMarkerTypeFunctions(
MarkerDataDeserializer aDeserializer,
MarkerTypeNameFunction aMarkerTypeNameFunction,
MarkerSchemaFunction aMarkerSchemaFunction);
// Get the `MarkerDataDeserializer` for a given `DeserializerTag`.
MFBT_API static MarkerDataDeserializer DeserializerForTag(
DeserializerTag aTag);
// Retrieve all MarkerTypeFunctions's.
MFBT_API static Span<const MarkerTypeFunctions> MarkerTypeFunctionsArray();
};
// This helper will examine a marker type's `StreamJSONMarkerData` function, see
// specialization below.
template <typename T>
struct StreamFunctionTypeHelper;
// Helper specialization that takes the expected
// `StreamJSONMarkerData(baseprofiler::SpliceableJSONWriter&, ...)` function and
// provide information about the `...` parameters.
template <typename R, typename... As>
struct StreamFunctionTypeHelper<R(baseprofiler::SpliceableJSONWriter&, As...)> {
constexpr static size_t scArity = sizeof...(As);
using TupleType =
std::tuple<std::remove_cv_t<std::remove_reference_t<As>>...>;
// Serialization function that takes the exact same parameter types
// (const-ref'd) as `StreamJSONMarkerData`. This has to be inside the helper
// because only here can we access the raw parameter pack `As...`.
// And because we're using the same argument types through
// references-to-const, permitted implicit conversions can happen.
static ProfileBufferBlockIndex Serialize(
ProfileChunkedBuffer& aBuffer, const ProfilerString8View& aName,
const MarkerCategory& aCategory, MarkerOptions&& aOptions,
Streaming::DeserializerTag aDeserializerTag, const As&... aAs) {
// Note that options are first after the entry kind, because they contain
// the thread id, which is handled first to filter markers by threads.
return aBuffer.PutObjects(ProfileBufferEntryKind::Marker, aOptions, aName,
aCategory, aDeserializerTag,
MarkerPayloadType::Cpp, aAs...);
}
};
// Helper for a marker type.
// A marker type is defined in a `struct` with some expected static member
// functions. See example in BaseProfilerMarkers.h.
template <typename MarkerType>
struct MarkerTypeSerialization {
// Definitions to access the expected
// `StreamJSONMarkerData(baseprofiler::SpliceableJSONWriter&, ...)` function
// and its parameters.
using StreamFunctionType =
StreamFunctionTypeHelper<decltype(MarkerType::StreamJSONMarkerData)>;
constexpr static size_t scStreamFunctionParameterCount =
StreamFunctionType::scArity;
using StreamFunctionUserParametersTuple =
typename StreamFunctionType::TupleType;
template <size_t i>
using StreamFunctionParameter =
std::tuple_element_t<i, StreamFunctionUserParametersTuple>;
template <typename... Ts>
static ProfileBufferBlockIndex Serialize(ProfileChunkedBuffer& aBuffer,
const ProfilerString8View& aName,
const MarkerCategory& aCategory,
MarkerOptions&& aOptions,
const Ts&... aTs) {
static_assert(!std::is_same_v<MarkerType,
::mozilla::baseprofiler::markers::NoPayload>,
"NoPayload should have been handled in the caller.");
// Register marker type functions, and get the tag for this deserializer.
// Note that the tag is stored in a function-static object, and this
// function is static in a templated struct, so there should only be one tag
// per MarkerType.
// Making the tag class-static may have been more efficient (to avoid a
// thread-safe init check at every call), but random global static
// initialization order would make it more complex to coordinate with
// `Streaming::TagForMarkerTypeFunctions()`, and also would add a (small)
// cost for everybody, even the majority of users not using the profiler.
static const Streaming::DeserializerTag tag =
Streaming::TagForMarkerTypeFunctions(Deserialize,
MarkerType::MarkerTypeName,
MarkerType::MarkerTypeDisplay);
return StreamFunctionType::Serialize(aBuffer, aName, aCategory,
std::move(aOptions), tag, aTs...);
}
private:
// This templated function will recursively deserialize each argument expected
// by `MarkerType::StreamJSONMarkerData()` on the stack, and call it at the
// end. E.g., for `StreamJSONMarkerData(int, char)`:
// - DeserializeArguments<0>(aER, aWriter) reads an int and calls:
// - DeserializeArguments<1>(aER, aWriter, const int&) reads a char and calls:
// - MarkerType::StreamJSONMarkerData(aWriter, const int&, const char&).
// Prototyping on godbolt showed that clang and gcc can flatten these
// recursive calls into one function with successive reads followed by the one
// stream call; tested up to 40 arguments: https://godbolt.org/z/5KeeM4
template <size_t i = 0, typename... Args>
static void DeserializeArguments(ProfileBufferEntryReader& aEntryReader,
baseprofiler::SpliceableJSONWriter& aWriter,
const Args&... aArgs) {
static_assert(sizeof...(Args) == i,
"We should have collected `i` arguments so far");
if constexpr (i < scStreamFunctionParameterCount) {
// Deserialize the i-th argument on this stack.
auto argument = aEntryReader.ReadObject<StreamFunctionParameter<i>>();
// Add our local argument to the next recursive call.
DeserializeArguments<i + 1>(aEntryReader, aWriter, aArgs..., argument);
} else {
// We've read all the arguments, finally call the `StreamJSONMarkerData`
// function, which should write the appropriate JSON elements for this
// marker type. Note that the MarkerType-specific "type" element is
// already written.
MarkerType::StreamJSONMarkerData(aWriter, aArgs...);
}
}
public:
static void Deserialize(ProfileBufferEntryReader& aEntryReader,
baseprofiler::SpliceableJSONWriter& aWriter) {
aWriter.StringProperty("type", MarkerType::MarkerTypeName());
DeserializeArguments(aEntryReader, aWriter);
}
};
template <>
struct MarkerTypeSerialization<::mozilla::baseprofiler::markers::NoPayload> {
// Nothing! NoPayload has special handling avoiding payload work.
};
template <typename MarkerType, typename... Ts>
static ProfileBufferBlockIndex AddMarkerWithOptionalStackToBuffer(
ProfileChunkedBuffer& aBuffer, const ProfilerString8View& aName,
const MarkerCategory& aCategory, MarkerOptions&& aOptions,
const Ts&... aTs) {
if constexpr (std::is_same_v<MarkerType,
::mozilla::baseprofiler::markers::NoPayload>) {
static_assert(sizeof...(Ts) == 0,
"NoPayload does not accept any payload arguments.");
// Special case for NoPayload where there is a stack or inner window id:
// Because these options would be stored in the payload 'data' object, but
// there is no such object for NoPayload, we convert the marker to another
// type (without user fields in the 'data' object), so that the stack and/or
// inner window id are not lost.
// TODO: Remove this when bug 1646714 lands.
if (aOptions.Stack().GetChunkedBuffer() ||
!aOptions.InnerWindowId().IsUnspecified()) {
struct NoPayloadUserData {
static constexpr Span<const char> MarkerTypeName() {
return MakeStringSpan("NoPayloadUserData");
}
static void StreamJSONMarkerData(
baseprofiler::SpliceableJSONWriter& aWriter) {
// No user payload.
}
static mozilla::MarkerSchema MarkerTypeDisplay() {
using MS = mozilla::MarkerSchema;
MS schema{MS::Location::MarkerChart, MS::Location::MarkerTable};
// No user data to display.
return schema;
}
};
return MarkerTypeSerialization<NoPayloadUserData>::Serialize(
aBuffer, aName, aCategory, std::move(aOptions));
}
// Note that options are first after the entry kind, because they contain
// the thread id, which is handled first to filter markers by threads.
return aBuffer.PutObjects(
ProfileBufferEntryKind::Marker, std::move(aOptions), aName, aCategory,
base_profiler_markers_detail::Streaming::DeserializerTag(0));
} else {
return MarkerTypeSerialization<MarkerType>::Serialize(
aBuffer, aName, aCategory, std::move(aOptions), aTs...);
}
}
// Pointer to a function that can capture a backtrace into the provided
// `ProfileChunkedBuffer`, and returns true when successful.
using BacktraceCaptureFunction = bool (*)(ProfileChunkedBuffer&,
StackCaptureOptions);
// Use a pre-allocated and cleared chunked buffer in the main thread's
// `AddMarkerToBuffer()`.
// Null if not the main thread, or if profilers are not active.
MFBT_API ProfileChunkedBuffer* GetClearedBufferForMainThreadAddMarker();
// Called by the profiler(s) when starting/stopping. Safe to nest.
MFBT_API void EnsureBufferForMainThreadAddMarker();
MFBT_API void ReleaseBufferForMainThreadAddMarker();
// Add a marker with the given name, options, and arguments to the given buffer.
// Because this may be called from either Base or Gecko Profiler functions, the
// appropriate backtrace-capturing function must also be provided.
template <typename MarkerType, typename... Ts>
ProfileBufferBlockIndex AddMarkerToBuffer(
ProfileChunkedBuffer& aBuffer, const ProfilerString8View& aName,
const MarkerCategory& aCategory, MarkerOptions&& aOptions,
BacktraceCaptureFunction aBacktraceCaptureFunction, const Ts&... aTs) {
if (aOptions.ThreadId().IsUnspecified()) {
// If yet unspecified, set thread to this thread where the marker is added.
aOptions.Set(MarkerThreadId::CurrentThread());
}
if (aOptions.IsTimingUnspecified()) {
// If yet unspecified, set timing to this instant of adding the marker.
aOptions.Set(MarkerTiming::InstantNow());
}
StackCaptureOptions captureOptions = aOptions.Stack().CaptureOptions();
if (captureOptions != StackCaptureOptions::NoStack) {
// A capture was requested, let's attempt to do it here&now. This avoids a
// lot of allocations that would be necessary if capturing a backtrace
// separately.
// TODO reduce internal profiler stack levels, see bug 1659872.
auto CaptureStackAndAddMarker = [&](ProfileChunkedBuffer& aChunkedBuffer) {
aOptions.StackRef().UseRequestedBacktrace(
aBacktraceCaptureFunction(aChunkedBuffer, captureOptions)
? &aChunkedBuffer
: nullptr);
// This call must be made from here, while chunkedBuffer is in scope.
return AddMarkerWithOptionalStackToBuffer<MarkerType>(
aBuffer, aName, aCategory, std::move(aOptions), aTs...);
};
if (ProfileChunkedBuffer* buffer = GetClearedBufferForMainThreadAddMarker();
buffer) {
// Use a pre-allocated buffer for the main thread (because it's the most
// used thread, and most sensitive to overhead), so it's only allocated
// once. It could be null if this is not the main thread, or no profilers
// are currently active.
return CaptureStackAndAddMarker(*buffer);
}
// TODO use a local on-stack byte buffer to remove last allocation.
ProfileBufferChunkManagerSingle chunkManager(
ProfileBufferChunkManager::scExpectedMaximumStackSize);
ProfileChunkedBuffer chunkedBuffer(
ProfileChunkedBuffer::ThreadSafety::WithoutMutex, chunkManager);
return CaptureStackAndAddMarker(chunkedBuffer);
}
return AddMarkerWithOptionalStackToBuffer<MarkerType>(
aBuffer, aName, aCategory, std::move(aOptions), aTs...);
}
// Assuming aEntryReader points right after the entry type (being Marker), this
// reads the remainder of the marker and outputs it.
// - GetWriterForThreadCallback, called first, after the thread id is read:
// (ThreadId) -> SpliceableJSONWriter* or null
// If null, nothing will be output, but aEntryReader will still be read fully.
// - StackCallback, only called if GetWriterForThreadCallback didn't return
// null, and if the marker contains a stack:
// (ProfileChunkedBuffer&) -> void
// - RustMarkerCallback, only called if GetWriterForThreadCallback didn't return
// null, and if the marker contains a Rust payload:
// (DeserializerTag) -> void
template <typename GetWriterForThreadCallback, typename StackCallback,
typename RustMarkerCallback>
void DeserializeAfterKindAndStream(
ProfileBufferEntryReader& aEntryReader,
GetWriterForThreadCallback&& aGetWriterForThreadCallback,
StackCallback&& aStackCallback, RustMarkerCallback&& aRustMarkerCallback) {
// Each entry is made up of the following:
// ProfileBufferEntry::Kind::Marker, <- already read by caller
// options, <- next location in entries
// name,
// payload
const MarkerOptions options = aEntryReader.ReadObject<MarkerOptions>();
baseprofiler::SpliceableJSONWriter* writer =
std::forward<GetWriterForThreadCallback>(aGetWriterForThreadCallback)(
options.ThreadId().ThreadId());
if (!writer) {
// No writer associated with this thread id, drop it.
aEntryReader.SetRemainingBytes(0);
return;
}
// Write the information to JSON with the following schema:
// [name, startTime, endTime, phase, category, data]
writer->StartArrayElement();
{
writer->UniqueStringElement(aEntryReader.ReadObject<ProfilerString8View>());
const double startTime = options.Timing().GetStartTime();
writer->TimeDoubleMsElement(startTime);
const double endTime = options.Timing().GetEndTime();
writer->TimeDoubleMsElement(endTime);
writer->IntElement(static_cast<int64_t>(options.Timing().MarkerPhase()));
MarkerCategory category = aEntryReader.ReadObject<MarkerCategory>();
writer->IntElement(static_cast<int64_t>(category.GetCategory()));
if (const auto tag =
aEntryReader.ReadObject<mozilla::base_profiler_markers_detail::
Streaming::DeserializerTag>();
tag != 0) {
writer->StartObjectElement(JSONWriter::SingleLineStyle);
{
// Stream "common props".
// TODO: Move this to top-level tuple, when frontend supports it.
if (!options.InnerWindowId().IsUnspecified()) {
// Here, we are converting uint64_t to double. Both Browsing Context
// and Inner Window IDs are created using
// `nsContentUtils::GenerateProcessSpecificId`, which is specifically
// designed to only use 53 of the 64 bits to be lossless when passed
// into and out of JS as a double.
writer->DoubleProperty(
"innerWindowID",
static_cast<double>(options.InnerWindowId().Id()));
}
// TODO: Move this to top-level tuple, when frontend supports it.
if (ProfileChunkedBuffer* chunkedBuffer =
options.Stack().GetChunkedBuffer();
chunkedBuffer) {
writer->StartObjectProperty("stack");
{ std::forward<StackCallback>(aStackCallback)(*chunkedBuffer); }
writer->EndObject();
}
auto payloadType = static_cast<mozilla::MarkerPayloadType>(
aEntryReader
.ReadObject<mozilla::MarkerPayloadTypeUnderlyingType>());
// Stream the payload, including the type.
switch (payloadType) {
case mozilla::MarkerPayloadType::Cpp: {
mozilla::base_profiler_markers_detail::Streaming::
MarkerDataDeserializer deserializer =
mozilla::base_profiler_markers_detail::Streaming::
DeserializerForTag(tag);
MOZ_RELEASE_ASSERT(deserializer);
deserializer(aEntryReader, *writer);
MOZ_ASSERT(aEntryReader.RemainingBytes() == 0u);
break;
}
case mozilla::MarkerPayloadType::Rust:
std::forward<RustMarkerCallback>(aRustMarkerCallback)(tag);
MOZ_ASSERT(aEntryReader.RemainingBytes() == 0u);
break;
default:
MOZ_ASSERT_UNREACHABLE("Unknown payload type.");
break;
}
}
writer->EndObject();
}
}
writer->EndArray();
MOZ_ASSERT(aEntryReader.RemainingBytes() == 0u);
}
} // namespace mozilla::base_profiler_markers_detail
namespace mozilla {
// ----------------------------------------------------------------------------
// Serializer, Deserializer: ProfilerStringView<CHAR>
// The serialization starts with a ULEB128 number that encodes both whether the
// ProfilerStringView is literal (Least Significant Bit = 0) or not (LSB = 1),
// plus the string length (excluding null terminator) in bytes, shifted left by
// 1 bit. Following that number:
// - If literal, the string pointer value.
// - If non-literal, the contents as bytes (excluding null terminator if any).
template <typename CHAR>
struct ProfileBufferEntryWriter::Serializer<ProfilerStringView<CHAR>> {
static Length Bytes(const ProfilerStringView<CHAR>& aString) {
MOZ_RELEASE_ASSERT(
aString.Length() < std::numeric_limits<Length>::max() / 2,
"Double the string length doesn't fit in Length type");
const Length stringLength = static_cast<Length>(aString.Length());
if (aString.IsLiteral()) {
// Literal -> Length shifted left and LSB=0, then pointer.
return ULEB128Size(stringLength << 1 | 0u) +
static_cast<ProfileChunkedBuffer::Length>(sizeof(const CHAR*));
}
// Non-literal -> Length shifted left and LSB=1, then string size in bytes.
return ULEB128Size((stringLength << 1) | 1u) + stringLength * sizeof(CHAR);
}
static void Write(ProfileBufferEntryWriter& aEW,
const ProfilerStringView<CHAR>& aString) {
MOZ_RELEASE_ASSERT(
aString.Length() < std::numeric_limits<Length>::max() / 2,
"Double the string length doesn't fit in Length type");
const Span<const CHAR> span = aString;
if (aString.IsLiteral()) {
// Literal -> Length shifted left and LSB=0, then pointer.
aEW.WriteULEB128(span.Length() << 1 | 0u);
aEW.WriteObject(WrapProfileBufferRawPointer(span.Elements()));
return;
}
// Non-literal -> Length shifted left and LSB=1, then string size in bytes.
aEW.WriteULEB128(span.Length() << 1 | 1u);
aEW.WriteBytes(span.Elements(), span.LengthBytes());
}
};
template <typename CHAR>
struct ProfileBufferEntryReader::Deserializer<ProfilerStringView<CHAR>> {
static void ReadInto(ProfileBufferEntryReader& aER,
ProfilerStringView<CHAR>& aString) {
aString = Read(aER);
}
static ProfilerStringView<CHAR> Read(ProfileBufferEntryReader& aER) {
const Length lengthAndIsLiteral = aER.ReadULEB128<Length>();
const Length stringLength = lengthAndIsLiteral >> 1;
if ((lengthAndIsLiteral & 1u) == 0u) {
// LSB==0 -> Literal string, read the string pointer.
return ProfilerStringView<CHAR>(
aER.ReadObject<const CHAR*>(), stringLength,
ProfilerStringView<CHAR>::Ownership::Literal);
}
// LSB==1 -> Not a literal string.
ProfileBufferEntryReader::DoubleSpanOfConstBytes spans =
aER.ReadSpans(stringLength * sizeof(CHAR));
if (MOZ_LIKELY(spans.IsSingleSpan()) &&
reinterpret_cast<uintptr_t>(spans.mFirstOrOnly.Elements()) %
alignof(CHAR) ==
0u) {
// Only a single span, correctly aligned for the CHAR type, we can just
// refer to it directly, assuming that this ProfilerStringView will not
// outlive the chunk.
return ProfilerStringView<CHAR>(
reinterpret_cast<const CHAR*>(spans.mFirstOrOnly.Elements()),
stringLength, ProfilerStringView<CHAR>::Ownership::Reference);
} else {
// Two spans, we need to concatenate them; or one span, but misaligned.
// Allocate a buffer to store the string (plus terminal, for safety), and
// give it to the ProfilerStringView; Note that this is a secret use of
// ProfilerStringView, which is intended to only be used between
// deserialization and JSON streaming.
CHAR* buffer = new CHAR[stringLength + 1];
spans.CopyBytesTo(buffer);
buffer[stringLength] = CHAR(0);
return ProfilerStringView<CHAR>(
buffer, stringLength,
ProfilerStringView<CHAR>::Ownership::OwnedThroughStringView);
}
}
};
// Serializer, Deserializer: MarkerCategory
// The serialization contains both category numbers encoded as ULEB128.
template <>
struct ProfileBufferEntryWriter::Serializer<MarkerCategory> {
static Length Bytes(const MarkerCategory& aCategory) {
return ULEB128Size(static_cast<uint32_t>(aCategory.CategoryPair()));
}
static void Write(ProfileBufferEntryWriter& aEW,
const MarkerCategory& aCategory) {
aEW.WriteULEB128(static_cast<uint32_t>(aCategory.CategoryPair()));
}
};
template <>
struct ProfileBufferEntryReader::Deserializer<MarkerCategory> {
static void ReadInto(ProfileBufferEntryReader& aER,
MarkerCategory& aCategory) {
aCategory = Read(aER);
}
static MarkerCategory Read(ProfileBufferEntryReader& aER) {
return MarkerCategory(static_cast<baseprofiler::ProfilingCategoryPair>(
aER.ReadULEB128<uint32_t>()));
}
};
// ----------------------------------------------------------------------------
// Serializer, Deserializer: MarkerTiming
// The serialization starts with the marker phase, followed by one or two
// timestamps as needed.
template <>
struct ProfileBufferEntryWriter::Serializer<MarkerTiming> {
static Length Bytes(const MarkerTiming& aTiming) {
MOZ_ASSERT(!aTiming.IsUnspecified());
const auto phase = aTiming.MarkerPhase();
switch (phase) {
case MarkerTiming::Phase::Instant:
return SumBytes(phase, aTiming.StartTime());
case MarkerTiming::Phase::Interval:
return SumBytes(phase, aTiming.StartTime(), aTiming.EndTime());
case MarkerTiming::Phase::IntervalStart:
return SumBytes(phase, aTiming.StartTime());
case MarkerTiming::Phase::IntervalEnd:
return SumBytes(phase, aTiming.EndTime());
default:
MOZ_RELEASE_ASSERT(phase == MarkerTiming::Phase::Instant ||
phase == MarkerTiming::Phase::Interval ||
phase == MarkerTiming::Phase::IntervalStart ||
phase == MarkerTiming::Phase::IntervalEnd);
return 0; // Only to avoid build errors.
}
}
static void Write(ProfileBufferEntryWriter& aEW,
const MarkerTiming& aTiming) {
MOZ_ASSERT(!aTiming.IsUnspecified());
const auto phase = aTiming.MarkerPhase();
switch (phase) {
case MarkerTiming::Phase::Instant:
aEW.WriteObjects(phase, aTiming.StartTime());
return;
case MarkerTiming::Phase::Interval:
aEW.WriteObjects(phase, aTiming.StartTime(), aTiming.EndTime());
return;
case MarkerTiming::Phase::IntervalStart:
aEW.WriteObjects(phase, aTiming.StartTime());
return;
case MarkerTiming::Phase::IntervalEnd:
aEW.WriteObjects(phase, aTiming.EndTime());
return;
default:
MOZ_RELEASE_ASSERT(phase == MarkerTiming::Phase::Instant ||
phase == MarkerTiming::Phase::Interval ||
phase == MarkerTiming::Phase::IntervalStart ||
phase == MarkerTiming::Phase::IntervalEnd);
return;
}
}
};
template <>
struct ProfileBufferEntryReader::Deserializer<MarkerTiming> {
static void ReadInto(ProfileBufferEntryReader& aER, MarkerTiming& aTiming) {
aTiming.mPhase = aER.ReadObject<MarkerTiming::Phase>();
switch (aTiming.mPhase) {
case MarkerTiming::Phase::Instant:
aTiming.mStartTime = aER.ReadObject<TimeStamp>();
aTiming.mEndTime = TimeStamp{};
break;
case MarkerTiming::Phase::Interval:
aTiming.mStartTime = aER.ReadObject<TimeStamp>();
aTiming.mEndTime = aER.ReadObject<TimeStamp>();
break;
case MarkerTiming::Phase::IntervalStart:
aTiming.mStartTime = aER.ReadObject<TimeStamp>();
aTiming.mEndTime = TimeStamp{};
break;
case MarkerTiming::Phase::IntervalEnd:
aTiming.mStartTime = TimeStamp{};
aTiming.mEndTime = aER.ReadObject<TimeStamp>();
break;
default:
MOZ_RELEASE_ASSERT(aTiming.mPhase == MarkerTiming::Phase::Instant ||
aTiming.mPhase == MarkerTiming::Phase::Interval ||
aTiming.mPhase ==
MarkerTiming::Phase::IntervalStart ||
aTiming.mPhase == MarkerTiming::Phase::IntervalEnd);
break;
}
}
static MarkerTiming Read(ProfileBufferEntryReader& aER) {
TimeStamp start;
TimeStamp end;
auto phase = aER.ReadObject<MarkerTiming::Phase>();
switch (phase) {
case MarkerTiming::Phase::Instant:
start = aER.ReadObject<TimeStamp>();
break;
case MarkerTiming::Phase::Interval:
start = aER.ReadObject<TimeStamp>();
end = aER.ReadObject<TimeStamp>();
break;
case MarkerTiming::Phase::IntervalStart:
start = aER.ReadObject<TimeStamp>();
break;
case MarkerTiming::Phase::IntervalEnd:
end = aER.ReadObject<TimeStamp>();
break;
default:
MOZ_RELEASE_ASSERT(phase == MarkerTiming::Phase::Instant ||
phase == MarkerTiming::Phase::Interval ||
phase == MarkerTiming::Phase::IntervalStart ||
phase == MarkerTiming::Phase::IntervalEnd);
break;
}
return MarkerTiming(start, end, phase);
}
};
// ----------------------------------------------------------------------------
// Serializer, Deserializer: MarkerStack
// The serialization only contains the `ProfileChunkedBuffer` from the
// backtrace; if there is no backtrace or if it's empty, this will implicitly
// store a nullptr (see
// `ProfileBufferEntryWriter::Serializer<ProfilerChunkedBuffer*>`).
template <>
struct ProfileBufferEntryWriter::Serializer<MarkerStack> {
static Length Bytes(const MarkerStack& aStack) {
return SumBytes(aStack.GetChunkedBuffer());
}
static void Write(ProfileBufferEntryWriter& aEW, const MarkerStack& aStack) {
aEW.WriteObject(aStack.GetChunkedBuffer());
}
};
template <>
struct ProfileBufferEntryReader::Deserializer<MarkerStack> {
static void ReadInto(ProfileBufferEntryReader& aER, MarkerStack& aStack) {
aStack = Read(aER);
}
static MarkerStack Read(ProfileBufferEntryReader& aER) {
return MarkerStack(aER.ReadObject<UniquePtr<ProfileChunkedBuffer>>());
}
};
// ----------------------------------------------------------------------------
// Serializer, Deserializer: MarkerOptions
// The serialization contains all members (either trivially-copyable, or they
// provide their specialization above).
template <>
struct ProfileBufferEntryWriter::Serializer<MarkerOptions> {
static Length Bytes(const MarkerOptions& aOptions) {
return SumBytes(aOptions.ThreadId(), aOptions.Timing(), aOptions.Stack(),
aOptions.InnerWindowId());
}
static void Write(ProfileBufferEntryWriter& aEW,
const MarkerOptions& aOptions) {
aEW.WriteObjects(aOptions.ThreadId(), aOptions.Timing(), aOptions.Stack(),
aOptions.InnerWindowId());
}
};
template <>
struct ProfileBufferEntryReader::Deserializer<MarkerOptions> {
static void ReadInto(ProfileBufferEntryReader& aER, MarkerOptions& aOptions) {
aER.ReadIntoObjects(aOptions.mThreadId, aOptions.mTiming, aOptions.mStack,
aOptions.mInnerWindowId);
}
static MarkerOptions Read(ProfileBufferEntryReader& aER) {
MarkerOptions options;
ReadInto(aER, options);
return options;
}
};
} // namespace mozilla
#endif // BaseProfilerMarkersDetail_h
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