mozglue/misc/AutoProfilerLabel.h
author Emilio Cobos Álvarez <emilio@crisal.io>
Tue, 02 Jul 2019 18:50:04 +0000
changeset 480995 6525ac41c35455512bc1b681df331a5b74cb75cc
parent 459686 26fb2a868911021c586ca56d64ede136ae28c015
child 481213 8fed7bc35767fdfab4bac0908ae9b21c08f49e1f
permissions -rw-r--r--
Bug 1562789 - SmallPointerArray should support moves, and have an IsEmpty() helper. r=froydnj This also implicitly deletes its copy-assignment operator and copy-constructor, which is great since it's a huge footgun. Differential Revision: https://phabricator.services.mozilla.com/D36549

/* -*- 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 mozilla_AutoProfilerLabel_h
#define mozilla_AutoProfilerLabel_h

#include "mozilla/Attributes.h"
#include "mozilla/GuardObjects.h"
#include "mozilla/Types.h"

// The Gecko Profiler defines AutoProfilerLabel, an RAII class for
// pushing/popping frames to/from the ProfilingStack.
//
// This file defines a class of the same name that does much the same thing,
// but which can be used in (and only in) mozglue. A different class is
// necessary because mozglue cannot directly access sProfilingStack.
//
// Note that this class is slightly slower than the other AutoProfilerLabel,
// and it lacks the macro wrappers. It also is effectively hardwired to use
// JS::ProfilingCategory::OTHER as the category pair, because that's what
// the callbacks provided by the profiler use. (Specifying the categories in
// this file would require #including ProfilingCategory.h in mozglue, which we
// don't want to do.)

class ProfilingStack;

namespace mozilla {

typedef ProfilingStack* (*ProfilerLabelEnter)(const char*, const char*, void*);
typedef void (*ProfilerLabelExit)(ProfilingStack*);

// Register callbacks that do the entry/exit work involving sProfilingStack.
MFBT_API void RegisterProfilerLabelEnterExit(ProfilerLabelEnter aEnter,
                                             ProfilerLabelExit aExit);

// This #ifdef prevents this AutoProfilerLabel from being defined in libxul,
// which would conflict with the one in the profiler.
#ifdef IMPL_MFBT

class MOZ_RAII AutoProfilerLabel {
 public:
  AutoProfilerLabel(const char* aLabel,
                    const char* aDynamicString MOZ_GUARD_OBJECT_NOTIFIER_PARAM);
  ~AutoProfilerLabel();

 private:
  MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
  ProfilingStack* mProfilingStack;
};

#endif

}  // namespace mozilla

#endif  // mozilla_AutoProfilerLabel_h