зеркало из https://github.com/mozilla/gecko-dev.git
325 строки
9.5 KiB
C++
325 строки
9.5 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 nsComponentManager_h__
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#define nsComponentManager_h__
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#include "nsXPCOM.h"
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#include "xpcom-private.h"
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#include "nsIComponentManager.h"
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#include "nsIComponentRegistrar.h"
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#include "nsIMemoryReporter.h"
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#include "nsIServiceManager.h"
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#include "nsIFile.h"
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#include "mozilla/ArenaAllocator.h"
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#include "mozilla/Atomics.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Module.h"
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#include "mozilla/Mutex.h"
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#include "nsXULAppAPI.h"
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#include "nsIFactory.h"
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#include "nsIInterfaceRequestor.h"
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#include "nsIInterfaceRequestorUtils.h"
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#include "PLDHashTable.h"
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#include "prtime.h"
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#include "nsCOMPtr.h"
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#include "nsAutoPtr.h"
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#include "nsWeakReference.h"
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#include "nsCOMArray.h"
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#include "nsDataHashtable.h"
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#include "nsInterfaceHashtable.h"
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#include "nsClassHashtable.h"
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#include "nsTArray.h"
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#include "mozilla/Components.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/Omnijar.h"
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#include "mozilla/Attributes.h"
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struct nsFactoryEntry;
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struct PRThread;
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#define NS_COMPONENTMANAGER_CID \
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{ /* 91775d60-d5dc-11d2-92fb-00e09805570f */ \
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0x91775d60, 0xd5dc, 0x11d2, { \
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0x92, 0xfb, 0x00, 0xe0, 0x98, 0x05, 0x57, 0x0f \
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} \
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}
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////////////////////////////////////////////////////////////////////////////////
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extern const mozilla::Module kXPCOMModule;
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namespace {
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class EntryWrapper;
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class MutexLock;
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} // namespace
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namespace mozilla {
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namespace xpcom {
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bool ProcessSelectorMatches(Module::ProcessSelector aSelector);
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bool FastProcessSelectorMatches(Module::ProcessSelector aSelector);
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} // namespace xpcom
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} // namespace mozilla
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/**
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* This is a wrapper around mozilla::Mutex which provides runtime
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* checking for a deadlock where the same thread tries to lock a mutex while
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* it is already locked. This checking is present in both debug and release
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* builds.
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*/
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class SafeMutex {
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public:
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explicit SafeMutex(const char* aName)
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: mMutex(aName), mOwnerThread(nullptr) {}
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~SafeMutex() {}
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void Lock() {
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AssertNotCurrentThreadOwns();
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mMutex.Lock();
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MOZ_ASSERT(mOwnerThread == nullptr);
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mOwnerThread = PR_GetCurrentThread();
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}
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void Unlock() {
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MOZ_ASSERT(mOwnerThread == PR_GetCurrentThread());
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mOwnerThread = nullptr;
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mMutex.Unlock();
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}
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void AssertCurrentThreadOwns() const {
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// This method is a debug-only check
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MOZ_ASSERT(mOwnerThread == PR_GetCurrentThread());
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}
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MOZ_NEVER_INLINE void AssertNotCurrentThreadOwns() const {
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// This method is a release-mode check
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if (PR_GetCurrentThread() == mOwnerThread) {
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MOZ_CRASH();
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}
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}
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private:
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mozilla::Mutex mMutex;
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mozilla::Atomic<PRThread*, mozilla::Relaxed> mOwnerThread;
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};
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typedef mozilla::BaseAutoLock<SafeMutex&> SafeMutexAutoLock;
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typedef mozilla::BaseAutoUnlock<SafeMutex&> SafeMutexAutoUnlock;
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class nsComponentManagerImpl final : public nsIComponentManager,
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public nsIServiceManager,
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public nsSupportsWeakReference,
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public nsIComponentRegistrar,
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public nsIInterfaceRequestor,
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public nsIMemoryReporter {
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIINTERFACEREQUESTOR
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NS_DECL_NSICOMPONENTMANAGER
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NS_DECL_NSICOMPONENTREGISTRAR
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NS_DECL_NSIMEMORYREPORTER
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static nsresult Create(nsISupports* aOuter, REFNSIID aIID, void** aResult);
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nsresult RegistryLocationForFile(nsIFile* aFile, nsCString& aResult);
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nsresult FileForRegistryLocation(const nsCString& aLocation, nsIFile** aSpec);
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NS_DECL_NSISERVICEMANAGER
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// nsComponentManagerImpl methods:
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nsComponentManagerImpl();
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static nsComponentManagerImpl* gComponentManager;
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nsresult Init();
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nsresult Shutdown(void);
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nsresult FreeServices();
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already_AddRefed<nsIFactory> FindFactory(const nsCID& aClass);
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already_AddRefed<nsIFactory> FindFactory(const char* aContractID,
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uint32_t aContractIDLen);
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already_AddRefed<nsIFactory> LoadFactory(nsFactoryEntry* aEntry);
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nsDataHashtable<nsIDPointerHashKey, nsFactoryEntry*> mFactories;
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nsDataHashtable<nsCStringHashKey, nsFactoryEntry*> mContractIDs;
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SafeMutex mLock;
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mozilla::Maybe<EntryWrapper> LookupByCID(const nsID& aCID);
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mozilla::Maybe<EntryWrapper> LookupByCID(const MutexLock&, const nsID& aCID);
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mozilla::Maybe<EntryWrapper> LookupByContractID(
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const nsACString& aContractID);
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mozilla::Maybe<EntryWrapper> LookupByContractID(
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const MutexLock&, const nsACString& aContractID);
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nsresult GetService(mozilla::xpcom::ModuleID, const nsIID& aIID,
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void** aResult);
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static bool JSLoaderReady() { return gComponentManager->mJSLoaderReady; }
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static void InitializeStaticModules();
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static void InitializeModuleLocations();
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struct ComponentLocation {
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NSLocationType type;
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mozilla::FileLocation location;
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};
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class ComponentLocationComparator {
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public:
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bool Equals(const ComponentLocation& aA,
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const ComponentLocation& aB) const {
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return (aA.type == aB.type && aA.location.Equals(aB.location));
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}
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};
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static nsTArray<ComponentLocation>* sModuleLocations;
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class KnownModule {
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public:
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/**
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* Static or binary module.
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*/
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explicit KnownModule(const mozilla::Module* aModule)
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: mModule(aModule), mLoaded(false), mFailed(false) {}
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explicit KnownModule(mozilla::FileLocation& aFile)
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: mModule(nullptr), mFile(aFile), mLoaded(false), mFailed(false) {}
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~KnownModule() {
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if (mLoaded && mModule->unloadProc) {
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mModule->unloadProc();
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}
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}
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bool Load();
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const mozilla::Module* Module() const { return mModule; }
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/**
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* For error logging, get a description of this module, either the
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* file path, or <static module>.
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*/
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nsCString Description() const;
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private:
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const mozilla::Module* mModule;
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mozilla::FileLocation mFile;
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bool mLoaded;
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bool mFailed;
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};
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// The KnownModule is kept alive by these members, it is
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// referenced by pointer from the factory entries.
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nsTArray<nsAutoPtr<KnownModule>> mKnownStaticModules;
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// The key is the URI string of the module
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nsClassHashtable<nsCStringHashKey, KnownModule> mKnownModules;
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// Mutex not held
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void RegisterModule(const mozilla::Module* aModule);
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// Mutex held
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void RegisterCIDEntryLocked(const mozilla::Module::CIDEntry* aEntry,
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KnownModule* aModule);
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void RegisterContractIDLocked(const mozilla::Module::ContractIDEntry* aEntry);
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// Mutex not held
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void RegisterManifest(NSLocationType aType, mozilla::FileLocation& aFile,
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bool aChromeOnly);
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struct ManifestProcessingContext {
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ManifestProcessingContext(NSLocationType aType,
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mozilla::FileLocation& aFile, bool aChromeOnly)
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: mType(aType), mFile(aFile), mChromeOnly(aChromeOnly) {}
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~ManifestProcessingContext() {}
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NSLocationType mType;
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mozilla::FileLocation mFile;
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bool mChromeOnly;
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};
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void ManifestManifest(ManifestProcessingContext& aCx, int aLineNo,
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char* const* aArgv);
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void ManifestComponent(ManifestProcessingContext& aCx, int aLineNo,
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char* const* aArgv);
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void ManifestContract(ManifestProcessingContext& aCx, int aLineNo,
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char* const* aArgv);
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void ManifestCategory(ManifestProcessingContext& aCx, int aLineNo,
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char* const* aArgv);
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void RereadChromeManifests(bool aChromeOnly = true);
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// Shutdown
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enum {
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NOT_INITIALIZED,
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NORMAL,
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SHUTDOWN_IN_PROGRESS,
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SHUTDOWN_COMPLETE
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} mStatus;
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mozilla::ArenaAllocator<1024 * 1, 8> mArena;
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struct PendingServiceInfo {
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const nsCID* cid;
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PRThread* thread;
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};
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inline PendingServiceInfo* AddPendingService(const nsCID& aServiceCID,
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PRThread* aThread);
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inline void RemovePendingService(const nsCID& aServiceCID);
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inline PRThread* GetPendingServiceThread(const nsCID& aServiceCID) const;
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nsTArray<PendingServiceInfo> mPendingServices;
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bool mJSLoaderReady = false;
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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private:
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~nsComponentManagerImpl();
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nsresult GetServiceLocked(MutexLock& aLock, EntryWrapper& aEntry,
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const nsIID& aIID, void** aResult);
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};
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#define NS_MAX_FILENAME_LEN 1024
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#define NS_ERROR_IS_DIR NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_XPCOM, 24)
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struct nsFactoryEntry {
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nsFactoryEntry(const mozilla::Module::CIDEntry* aEntry,
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nsComponentManagerImpl::KnownModule* aModule);
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// nsIComponentRegistrar.registerFactory support
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nsFactoryEntry(const nsCID& aClass, nsIFactory* aFactory);
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~nsFactoryEntry();
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already_AddRefed<nsIFactory> GetFactory();
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nsresult CreateInstance(nsISupports* aOuter, const nsIID& aIID,
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void** aResult);
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);
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const mozilla::Module::CIDEntry* mCIDEntry;
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nsComponentManagerImpl::KnownModule* mModule;
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nsCOMPtr<nsIFactory> mFactory;
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nsCOMPtr<nsISupports> mServiceObject;
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};
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#endif // nsComponentManager_h__
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