author Ehsan Akhgari <ehsan@mozilla.com>
Fri, 24 Apr 2015 15:12:50 -0400
changeset 267826 9ef3b7efaaa734430bcb9e5b612dcc14a56bd60c
parent 259646 a20c7910a82fa2df2f3398c1108d102bac9128b0
child 269788 2328731ef45354daf50eb21607a3c781ab79bc7c
permissions -rw-r--r--
Bug 892973 - Add support for the YouCompleteMe vim plugin. r=gps, a=NPOTB

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */


#include "prio.h"
#include "plarena.h"
#include "nsClassHashtable.h"
#include "nsICategoryManager.h"
#include "nsIMemoryReporter.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Mutex.h"
#include "mozilla/Attributes.h"

class nsIMemoryReporter;

/* 16d222a6-1dd2-11b2-b693-f38b02c021b2 */
{ 0x16d222a6, 0x1dd2, 0x11b2, \
  {0xb6, 0x93, 0xf3, 0x8b, 0x02, 0xc0, 0x21, 0xb2} }

 * a "leaf-node", managed by the nsCategoryNode hashtable.
 * we need to keep a "persistent value" (which will be written to the registry)
 * and a non-persistent value (for the current runtime): these are usually
 * the same, except when aPersist==false. The strings are permanently arena-
 * allocated, and will never go away.
class CategoryLeaf : public nsDepCharHashKey
  explicit CategoryLeaf(const char* aKey) : nsDepCharHashKey(aKey), value(nullptr) {}
  const char* value;

 * CategoryNode keeps a hashtable of its entries.
 * the CategoryNode itself is permanently allocated in
 * the arena.
class CategoryNode
  NS_METHOD GetLeaf(const char* aEntryName,
                    char** aResult);

  NS_METHOD AddLeaf(const char* aEntryName,
                    const char* aValue,
                    bool aReplace,
                    char** aResult,
                    PLArenaPool* aArena);

  void DeleteLeaf(const char* aEntryName);

  void Clear()
    mozilla::MutexAutoLock lock(mLock);

  uint32_t Count()
    mozilla::MutexAutoLock lock(mLock);
    uint32_t tCount = mTable.Count();
    return tCount;

  NS_METHOD Enumerate(nsISimpleEnumerator** aResult);

  // CategoryNode is arena-allocated, with the strings
  static CategoryNode* Create(PLArenaPool* aArena);
  void operator delete(void*) {}

  size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf);

  CategoryNode() : mLock("CategoryLeaf") {}

  void* operator new(size_t aSize, PLArenaPool* aArena);

  nsTHashtable<CategoryLeaf> mTable;
  mozilla::Mutex mLock;

 * The main implementation of nsICategoryManager.
 * This implementation is thread-safe.
class nsCategoryManager final
  : public nsICategoryManager
  , public nsIMemoryReporter

   * Suppress or unsuppress notifications of category changes to the
   * observer service. This is to be used by nsComponentManagerImpl
   * on startup while reading the stored category list.
  NS_METHOD SuppressNotifications(bool aSuppress);

  void AddCategoryEntry(const char* aCategory,
                        const char* aKey,
                        const char* aValue,
                        bool aReplace = true,
                        char** aOldValue = nullptr);

  static nsresult Create(nsISupports* aOuter, REFNSIID aIID, void** aResult);
  void InitMemoryReporter();

  static nsCategoryManager* GetSingleton();
  static void Destroy();

  static nsCategoryManager* gCategoryManager;


  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);

  CategoryNode* get_category(const char* aName);
  void NotifyObservers(const char* aTopic,
                       const char* aCategoryName, // must be a static string
                       const char* aEntryName);

  PLArenaPool mArena;
  nsClassHashtable<nsDepCharHashKey, CategoryNode> mTable;
  mozilla::Mutex mLock;
  bool mSuppressNotifications;