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74 lines
1.9 KiB
C++
74 lines
1.9 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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#ifndef AutoTimelineMarker_h__
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#define AutoTimelineMarker_h__
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#include "mozilla/GuardObjects.h"
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#include "mozilla/Move.h"
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#include "nsDocShell.h"
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#include "nsRefPtr.h"
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namespace mozilla {
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// # AutoTimelineMarker
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//
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// An RAII class to trace some task in the platform by adding a start and end
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// timeline marker pair. These markers are then rendered in the devtools'
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// performance tool's waterfall graph.
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//
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// Example usage:
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//
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// {
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// AutoTimelineMarker marker(mDocShell, "Parse CSS");
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// nsresult rv = ParseTheCSSFile(mFile);
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// ...
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// }
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class MOZ_STACK_CLASS AutoTimelineMarker
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{
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER;
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nsRefPtr<nsDocShell> mDocShell;
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const char* mName;
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bool
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DocShellIsRecording(nsDocShell& aDocShell)
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{
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bool isRecording = false;
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if (nsDocShell::gProfileTimelineRecordingsCount > 0) {
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aDocShell.GetRecordProfileTimelineMarkers(&isRecording);
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}
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return isRecording;
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}
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public:
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explicit AutoTimelineMarker(nsIDocShell* aDocShell, const char* aName
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MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
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: mDocShell(nullptr)
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, mName(aName)
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{
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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nsDocShell* docShell = static_cast<nsDocShell*>(aDocShell);
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if (docShell && DocShellIsRecording(*docShell)) {
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mDocShell = docShell;
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mDocShell->AddProfileTimelineMarker(mName, TRACING_INTERVAL_START);
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}
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}
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~AutoTimelineMarker()
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{
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if (mDocShell) {
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mDocShell->AddProfileTimelineMarker(mName, TRACING_INTERVAL_END);
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}
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}
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};
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} // namespace mozilla
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#endif /* AutoTimelineMarker_h__ */
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