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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 */
#ifndef PageInformation_h
#define PageInformation_h
#include "mozilla/Atomics.h"
#include "mozilla/Maybe.h"
#include "mozilla/MemoryReporting.h"
#include <string>
namespace mozilla {
namespace baseprofiler {
class SpliceableJSONWriter;
// This class contains information that's relevant to a single page only
// while the page information is important and registered with the profiler,
// but regardless of whether the profiler is running. All accesses to it are
// protected by the profiler state lock.
// When the page gets unregistered, we keep the profiler buffer position
// to determine if we are still using this page. If not, we unregister
// it in the next page registration.
class PageInformation final {
PageInformation(uint64_t aTabID, uint64_t aInnerWindowID,
const std::string& aUrl, uint64_t aEmbedderInnerWindowID);
// Using hand-rolled ref-counting, because RefCounted.h macros don't produce
// the same code between mozglue and libxul, see bug 1536656.
MFBT_API void AddRef() const { ++mRefCnt; }
MFBT_API void Release() const {
MOZ_ASSERT(int32_t(mRefCnt) > 0);
if (--mRefCnt) {
delete this;
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
bool Equals(PageInformation* aOtherPageInfo) const;
void StreamJSON(SpliceableJSONWriter& aWriter) const;
uint64_t InnerWindowID() const { return mInnerWindowID; }
uint64_t TabID() const { return mTabID; }
const std::string& Url() const { return mUrl; }
uint64_t EmbedderInnerWindowID() const { return mEmbedderInnerWindowID; }
Maybe<uint64_t> BufferPositionWhenUnregistered() const {
return mBufferPositionWhenUnregistered;
void NotifyUnregistered(uint64_t aBufferPosition) {
mBufferPositionWhenUnregistered = Some(aBufferPosition);
const uint64_t mTabID;
const uint64_t mInnerWindowID;
const std::string mUrl;
const uint64_t mEmbedderInnerWindowID;
// Holds the buffer position when page is unregistered.
// It's used to determine if we still use this page in the profiler or
// not.
Maybe<uint64_t> mBufferPositionWhenUnregistered;
mutable Atomic<int32_t, MemoryOrdering::ReleaseAcquire> mRefCnt;
} // namespace baseprofiler
} // namespace mozilla
#endif // PageInformation_h