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gecko-dev
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gecko-dev/xpcom/components/nsComponentManager.cpp

2011 строки
56 KiB
C++
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/* -*- Mode: C++; tab-width: 8; 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/. */
#include <stdlib.h>
#include "nscore.h"
#include "nsISupports.h"
#include "nspr.h"
#include "nsCRT.h" // for atoll
#include "nsCategoryManager.h"
#include "nsCOMPtr.h"
#include "nsComponentManager.h"
#include "nsDirectoryService.h"
#include "nsDirectoryServiceDefs.h"
#include "nsCategoryManager.h"
#include "nsCategoryManagerUtils.h"
#include "xptiprivate.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/XPTInterfaceInfoManager.h"
#include "nsIConsoleService.h"
#include "nsIObserverService.h"
#include "nsISimpleEnumerator.h"
#include "nsIStringEnumerator.h"
#include "nsXPCOM.h"
#include "nsXPCOMPrivate.h"
#include "nsISupportsPrimitives.h"
#include "nsIClassInfo.h"
#include "nsLocalFile.h"
#include "nsReadableUtils.h"
#include "nsString.h"
#include "prcmon.h"
#include "xptinfo.h" // this after nsISupports, to pick up IID so that xpt stuff doesn't try to define it itself...
#include "nsThreadUtils.h"
#include "prthread.h"
#include "private/pprthred.h"
#include "nsTArray.h"
#include "prio.h"
#include "ManifestParser.h"
#include "nsNetUtil.h"
#include "mozilla/Services.h"
#include "mozilla/GenericFactory.h"
#include "nsSupportsPrimitives.h"
#include "nsArray.h"
#include "nsIMutableArray.h"
#include "nsArrayEnumerator.h"
#include "nsStringEnumerator.h"
#include "mozilla/FileUtils.h"
#include "mozilla/UniquePtr.h"
#include "nsDataHashtable.h"
#include <new> // for placement new
#include "mozilla/Omnijar.h"
#include "mozilla/Logging.h"
#include "LogModulePrefWatcher.h"
using namespace mozilla;
static LazyLogModule nsComponentManagerLog("nsComponentManager");
#if 0
#define SHOW_DENIED_ON_SHUTDOWN
#define SHOW_CI_ON_EXISTING_SERVICE
#endif
// Bloated registry buffer size to improve startup performance -- needs to
// be big enough to fit the entire file into memory or it'll thrash.
// 512K is big enough to allow for some future growth in the registry.
#define BIG_REGISTRY_BUFLEN (512*1024)
// Common Key Names
const char xpcomComponentsKeyName[] = "software/mozilla/XPCOM/components";
const char xpcomKeyName[] = "software/mozilla/XPCOM";
// Common Value Names
const char fileSizeValueName[] = "FileSize";
const char lastModValueName[] = "LastModTimeStamp";
const char nativeComponentType[] = "application/x-mozilla-native";
const char staticComponentType[] = "application/x-mozilla-static";
NS_DEFINE_CID(kCategoryManagerCID, NS_CATEGORYMANAGER_CID);
#define UID_STRING_LENGTH 39
nsresult
nsGetServiceFromCategory::operator()(const nsIID& aIID,
void** aInstancePtr) const
{
nsresult rv;
nsCString value;
nsCOMPtr<nsICategoryManager> catman;
nsComponentManagerImpl* compMgr = nsComponentManagerImpl::gComponentManager;
if (!compMgr) {
rv = NS_ERROR_NOT_INITIALIZED;
goto error;
}
if (!mCategory || !mEntry) {
// when categories have defaults, use that for null mEntry
rv = NS_ERROR_NULL_POINTER;
goto error;
}
rv = compMgr->nsComponentManagerImpl::GetService(kCategoryManagerCID,
NS_GET_IID(nsICategoryManager),
getter_AddRefs(catman));
if (NS_FAILED(rv)) {
goto error;
}
/* find the contractID for category.entry */
rv = catman->GetCategoryEntry(mCategory, mEntry,
getter_Copies(value));
if (NS_FAILED(rv)) {
goto error;
}
if (value.IsVoid()) {
rv = NS_ERROR_SERVICE_NOT_AVAILABLE;
goto error;
}
rv = compMgr->nsComponentManagerImpl::GetServiceByContractID(value.get(),
aIID,
aInstancePtr);
if (NS_FAILED(rv)) {
error:
*aInstancePtr = 0;
}
if (mErrorPtr) {
*mErrorPtr = rv;
}
return rv;
}
// GetService and a few other functions need to exit their mutex mid-function
// without reentering it later in the block. This class supports that
// style of early-exit that MutexAutoUnlock doesn't.
namespace {
class MOZ_STACK_CLASS MutexLock
{
public:
explicit MutexLock(SafeMutex& aMutex)
: mMutex(aMutex)
, mLocked(false)
{
Lock();
}
~MutexLock()
{
if (mLocked) {
Unlock();
}
}
void Lock()
{
NS_ASSERTION(!mLocked, "Re-entering a mutex");
mMutex.Lock();
mLocked = true;
}
void Unlock()
{
NS_ASSERTION(mLocked, "Exiting a mutex that isn't held!");
mMutex.Unlock();
mLocked = false;
}
private:
SafeMutex& mMutex;
bool mLocked;
};
} // namespace
// this is safe to call during InitXPCOM
static already_AddRefed<nsIFile>
GetLocationFromDirectoryService(const char* aProp)
{
nsCOMPtr<nsIProperties> directoryService;
nsDirectoryService::Create(nullptr,
NS_GET_IID(nsIProperties),
getter_AddRefs(directoryService));
if (!directoryService) {
return nullptr;
}
nsCOMPtr<nsIFile> file;
nsresult rv = directoryService->Get(aProp,
NS_GET_IID(nsIFile),
getter_AddRefs(file));
if (NS_FAILED(rv)) {
return nullptr;
}
return file.forget();
}
static already_AddRefed<nsIFile>
CloneAndAppend(nsIFile* aBase, const nsACString& aAppend)
{
nsCOMPtr<nsIFile> f;
aBase->Clone(getter_AddRefs(f));
if (!f) {
return nullptr;
}
f->AppendNative(aAppend);
return f.forget();
}
////////////////////////////////////////////////////////////////////////////////
// nsComponentManagerImpl
////////////////////////////////////////////////////////////////////////////////
nsresult
nsComponentManagerImpl::Create(nsISupports* aOuter, REFNSIID aIID,
void** aResult)
{
if (aOuter) {
return NS_ERROR_NO_AGGREGATION;
}
if (!gComponentManager) {
return NS_ERROR_FAILURE;
}
return gComponentManager->QueryInterface(aIID, aResult);
}
static const int CONTRACTID_HASHTABLE_INITIAL_LENGTH = 1024;
nsComponentManagerImpl::nsComponentManagerImpl()
: mFactories(CONTRACTID_HASHTABLE_INITIAL_LENGTH)
, mContractIDs(CONTRACTID_HASHTABLE_INITIAL_LENGTH)
, mLock("nsComponentManagerImpl.mLock")
, mStatus(NOT_INITIALIZED)
{
}
nsTArray<const mozilla::Module*>* nsComponentManagerImpl::sStaticModules;
NSMODULE_DEFN(start_kPStaticModules);
NSMODULE_DEFN(end_kPStaticModules);
/* The content between start_kPStaticModules and end_kPStaticModules is gathered
* by the linker from various objects containing symbols in a specific section.
* ASAN considers (rightfully) the use of this content as a global buffer
* overflow. But this is a deliberate and well-considered choice, with no proper
* way to make ASAN happy. */
MOZ_ASAN_BLACKLIST
/* static */ void
nsComponentManagerImpl::InitializeStaticModules()
{
if (sStaticModules) {
return;
}
sStaticModules = new nsTArray<const mozilla::Module*>;
for (const mozilla::Module * const* staticModules =
&NSMODULE_NAME(start_kPStaticModules) + 1;
staticModules < &NSMODULE_NAME(end_kPStaticModules); ++staticModules)
if (*staticModules) { // ASAN adds padding
sStaticModules->AppendElement(*staticModules);
}
}
nsTArray<nsComponentManagerImpl::ComponentLocation>*
nsComponentManagerImpl::sModuleLocations;
/* static */ void
nsComponentManagerImpl::InitializeModuleLocations()
{
if (sModuleLocations) {
return;
}
sModuleLocations = new nsTArray<ComponentLocation>;
}
nsresult
nsComponentManagerImpl::Init()
{
MOZ_ASSERT(NOT_INITIALIZED == mStatus);
nsCOMPtr<nsIFile> greDir =
GetLocationFromDirectoryService(NS_GRE_DIR);
nsCOMPtr<nsIFile> appDir =
GetLocationFromDirectoryService(NS_XPCOM_CURRENT_PROCESS_DIR);
InitializeStaticModules();
nsCategoryManager::GetSingleton()->SuppressNotifications(true);
RegisterModule(&kXPCOMModule, nullptr);
for (uint32_t i = 0; i < sStaticModules->Length(); ++i) {
RegisterModule((*sStaticModules)[i], nullptr);
}
bool loadChromeManifests = (XRE_GetProcessType() != GeckoProcessType_GPU);
if (loadChromeManifests) {
// The overall order in which chrome.manifests are expected to be treated
// is the following:
// - greDir
// - greDir's omni.ja
// - appDir
// - appDir's omni.ja
InitializeModuleLocations();
ComponentLocation* cl = sModuleLocations->AppendElement();
nsCOMPtr<nsIFile> lf = CloneAndAppend(greDir,
NS_LITERAL_CSTRING("chrome.manifest"));
cl->type = NS_APP_LOCATION;
cl->location.Init(lf);
RefPtr<nsZipArchive> greOmnijar =
mozilla::Omnijar::GetReader(mozilla::Omnijar::GRE);
if (greOmnijar) {
cl = sModuleLocations->AppendElement();
cl->type = NS_APP_LOCATION;
cl->location.Init(greOmnijar, "chrome.manifest");
}
bool equals = false;
appDir->Equals(greDir, &equals);
if (!equals) {
cl = sModuleLocations->AppendElement();
cl->type = NS_APP_LOCATION;
lf = CloneAndAppend(appDir, NS_LITERAL_CSTRING("chrome.manifest"));
cl->location.Init(lf);
}
RefPtr<nsZipArchive> appOmnijar =
mozilla::Omnijar::GetReader(mozilla::Omnijar::APP);
if (appOmnijar) {
cl = sModuleLocations->AppendElement();
cl->type = NS_APP_LOCATION;
cl->location.Init(appOmnijar, "chrome.manifest");
}
RereadChromeManifests(false);
}
nsCategoryManager::GetSingleton()->SuppressNotifications(false);
RegisterWeakMemoryReporter(this);
// NB: The logging preference watcher needs to be registered late enough in
// startup that it's okay to use the preference system, but also as soon as
// possible so that log modules enabled via preferences are turned on as
// early as possible.
//
// We can't initialize the preference watcher when the log module manager is
// initialized, as a number of things attempt to start logging before the
// preference system is initialized.
//
// The preference system is registered as a component so at this point during
// component manager initialization we know it is setup and we can register
// for notifications.
LogModulePrefWatcher::RegisterPrefWatcher();
// Unfortunately, we can't register the nsCategoryManager memory reporter
// in its constructor (which is triggered by the GetSingleton() call
// above) because the memory reporter manager isn't initialized at that
// point. So we wait until now.
nsCategoryManager::GetSingleton()->InitMemoryReporter();
MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
("nsComponentManager: Initialized."));
mStatus = NORMAL;
return NS_OK;
}
static bool
ProcessSelectorMatches(Module::ProcessSelector aSelector)
{
GeckoProcessType type = XRE_GetProcessType();
if (type == GeckoProcessType_GPU) {
return !!(aSelector & Module::ALLOW_IN_GPU_PROCESS);
}
if (aSelector & Module::MAIN_PROCESS_ONLY) {
return type == GeckoProcessType_Default;
}
if (aSelector & Module::CONTENT_PROCESS_ONLY) {
return type == GeckoProcessType_Content;
}
return true;
}
static const int kModuleVersionWithSelector = 51;
void
nsComponentManagerImpl::RegisterModule(const mozilla::Module* aModule,
FileLocation* aFile)
{
mLock.AssertNotCurrentThreadOwns();
if (aModule->mVersion >= kModuleVersionWithSelector &&
!ProcessSelectorMatches(aModule->selector))
{
return;
}
{
// Scope the monitor so that we don't hold it while calling into the
// category manager.
MutexLock lock(mLock);
KnownModule* m;
if (aFile) {
nsCString uri;
aFile->GetURIString(uri);
NS_ASSERTION(!mKnownModules.Get(uri),
"Must not register a binary module twice.");
m = new KnownModule(aModule, *aFile);
mKnownModules.Put(uri, m);
} else {
m = new KnownModule(aModule);
mKnownStaticModules.AppendElement(m);
}
if (aModule->mCIDs) {
const mozilla::Module::CIDEntry* entry;
for (entry = aModule->mCIDs; entry->cid; ++entry) {
RegisterCIDEntryLocked(entry, m);
}
}
if (aModule->mContractIDs) {
const mozilla::Module::ContractIDEntry* entry;
for (entry = aModule->mContractIDs; entry->contractid; ++entry) {
RegisterContractIDLocked(entry);
}
MOZ_ASSERT(!entry->cid, "Incorrectly terminated contract list");
}
}
if (aModule->mCategoryEntries) {
const mozilla::Module::CategoryEntry* entry;
for (entry = aModule->mCategoryEntries; entry->category; ++entry)
nsCategoryManager::GetSingleton()->AddCategoryEntry(entry->category,
entry->entry,
entry->value);
}
}
void
nsComponentManagerImpl::RegisterCIDEntryLocked(
const mozilla::Module::CIDEntry* aEntry,
KnownModule* aModule)
{
mLock.AssertCurrentThreadOwns();
if (!ProcessSelectorMatches(aEntry->processSelector)) {
return;
}
if (auto entry = mFactories.LookupForAdd(*aEntry->cid)) {
nsFactoryEntry* f = entry.Data();
NS_WARNING("Re-registering a CID?");
char idstr[NSID_LENGTH];
aEntry->cid->ToProvidedString(idstr);
nsCString existing;
if (f->mModule) {
existing = f->mModule->Description();
} else {
existing = "<unknown module>";
}
SafeMutexAutoUnlock unlock(mLock);
LogMessage("While registering XPCOM module %s, trying to re-register CID '%s' already registered by %s.",
aModule->Description().get(),
idstr,
existing.get());
} else {
entry.OrInsert([aEntry, aModule] () { return new nsFactoryEntry(aEntry, aModule); });
}
}
void
nsComponentManagerImpl::RegisterContractIDLocked(
const mozilla::Module::ContractIDEntry* aEntry)
{
mLock.AssertCurrentThreadOwns();
if (!ProcessSelectorMatches(aEntry->processSelector)) {
return;
}
nsFactoryEntry* f = mFactories.Get(*aEntry->cid);
if (!f) {
NS_WARNING("No CID found when attempting to map contract ID");
char idstr[NSID_LENGTH];
aEntry->cid->ToProvidedString(idstr);
SafeMutexAutoUnlock unlock(mLock);
LogMessage("Could not map contract ID '%s' to CID %s because no implementation of the CID is registered.",
aEntry->contractid,
idstr);
return;
}
mContractIDs.Put(nsDependentCString(aEntry->contractid), f);
}
static void
CutExtension(nsCString& aPath)
{
int32_t dotPos = aPath.RFindChar('.');
if (kNotFound == dotPos) {
aPath.Truncate();
} else {
aPath.Cut(0, dotPos + 1);
}
}
static void
DoRegisterManifest(NSLocationType aType,
FileLocation& aFile,
bool aChromeOnly,
bool aXPTOnly)
{
MOZ_ASSERT(!aXPTOnly || !nsComponentManagerImpl::gComponentManager);
uint32_t len;
FileLocation::Data data;
UniquePtr<char[]> buf;
nsresult rv = aFile.GetData(data);
if (NS_SUCCEEDED(rv)) {
rv = data.GetSize(&len);
}
if (NS_SUCCEEDED(rv)) {
buf = MakeUnique<char[]>(len + 1);
rv = data.Copy(buf.get(), len);
}
if (NS_SUCCEEDED(rv)) {
buf[len] = '\0';
ParseManifest(aType, aFile, buf.get(), aChromeOnly, aXPTOnly);
} else if (NS_BOOTSTRAPPED_LOCATION != aType) {
nsCString uri;
aFile.GetURIString(uri);
LogMessage("Could not read chrome manifest '%s'.", uri.get());
}
}
void
nsComponentManagerImpl::RegisterManifest(NSLocationType aType,
FileLocation& aFile,
bool aChromeOnly)
{
DoRegisterManifest(aType, aFile, aChromeOnly, false);
}
void
nsComponentManagerImpl::ManifestManifest(ManifestProcessingContext& aCx,
int aLineNo, char* const* aArgv)
{
char* file = aArgv[0];
FileLocation f(aCx.mFile, file);
RegisterManifest(aCx.mType, f, aCx.mChromeOnly);
}
void
nsComponentManagerImpl::ManifestBinaryComponent(ManifestProcessingContext& aCx,
int aLineNo,
char* const* aArgv)
{
LogMessageWithContext(aCx.mFile, aLineNo,
"Binary XPCOM components are no longer supported.");
}
static void
DoRegisterXPT(FileLocation& aFile)
{
uint32_t len;
FileLocation::Data data;
UniquePtr<char[]> buf;
nsresult rv = aFile.GetData(data);
if (NS_SUCCEEDED(rv)) {
rv = data.GetSize(&len);
}
if (NS_SUCCEEDED(rv)) {
buf = MakeUnique<char[]>(len);
rv = data.Copy(buf.get(), len);
}
if (NS_SUCCEEDED(rv)) {
XPTInterfaceInfoManager::GetSingleton()->RegisterBuffer(buf.get(), len);
} else {
nsCString uri;
aFile.GetURIString(uri);
LogMessage("Could not read '%s'.", uri.get());
}
}
void
nsComponentManagerImpl::ManifestXPT(ManifestProcessingContext& aCx,
int aLineNo, char* const* aArgv)
{
FileLocation f(aCx.mFile, aArgv[0]);
DoRegisterXPT(f);
}
void
nsComponentManagerImpl::ManifestComponent(ManifestProcessingContext& aCx,
int aLineNo, char* const* aArgv)
{
mLock.AssertNotCurrentThreadOwns();
char* id = aArgv[0];
char* file = aArgv[1];
nsID cid;
if (!cid.Parse(id)) {
LogMessageWithContext(aCx.mFile, aLineNo,
"Malformed CID: '%s'.", id);
return;
}
// Precompute the hash/file data outside of the lock
FileLocation fl(aCx.mFile, file);
nsCString hash;
fl.GetURIString(hash);
MutexLock lock(mLock);
auto entry = mFactories.LookupForAdd(cid);
if (entry) {
nsFactoryEntry* f = entry.Data();
char idstr[NSID_LENGTH];
cid.ToProvidedString(idstr);
nsCString existing;
if (f->mModule) {
existing = f->mModule->Description();
} else {
existing = "<unknown module>";
}
lock.Unlock();
LogMessageWithContext(aCx.mFile, aLineNo,
"Trying to re-register CID '%s' already registered by %s.",
idstr,
existing.get());
return;
}
KnownModule* km;
km = mKnownModules.Get(hash);
if (!km) {
km = new KnownModule(fl);
mKnownModules.Put(hash, km);
}
void* place = mArena.Allocate(sizeof(nsCID));
nsID* permanentCID = static_cast<nsID*>(place);
*permanentCID = cid;
place = mArena.Allocate(sizeof(mozilla::Module::CIDEntry));
auto* e = new (KnownNotNull, place) mozilla::Module::CIDEntry();
e->cid = permanentCID;
entry.OrInsert([e, km] () { return new nsFactoryEntry(e, km); });
}
void
nsComponentManagerImpl::ManifestContract(ManifestProcessingContext& aCx,
int aLineNo, char* const* aArgv)
{
mLock.AssertNotCurrentThreadOwns();
char* contract = aArgv[0];
char* id = aArgv[1];
nsID cid;
if (!cid.Parse(id)) {
LogMessageWithContext(aCx.mFile, aLineNo,
"Malformed CID: '%s'.", id);
return;
}
MutexLock lock(mLock);
nsFactoryEntry* f = mFactories.Get(cid);
if (!f) {
lock.Unlock();
LogMessageWithContext(aCx.mFile, aLineNo,
"Could not map contract ID '%s' to CID %s because no implementation of the CID is registered.",
contract, id);
return;
}
mContractIDs.Put(nsDependentCString(contract), f);
}
void
nsComponentManagerImpl::ManifestCategory(ManifestProcessingContext& aCx,
int aLineNo, char* const* aArgv)
{
char* category = aArgv[0];
char* key = aArgv[1];
char* value = aArgv[2];
nsCategoryManager::GetSingleton()->
AddCategoryEntry(category, key, value);
}
void
nsComponentManagerImpl::RereadChromeManifests(bool aChromeOnly)
{
for (uint32_t i = 0; i < sModuleLocations->Length(); ++i) {
ComponentLocation& l = sModuleLocations->ElementAt(i);
RegisterManifest(l.type, l.location, aChromeOnly);
}
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (obs) {
obs->NotifyObservers(nullptr, "chrome-manifests-loaded", nullptr);
}
}
bool
nsComponentManagerImpl::KnownModule::EnsureLoader()
{
if (!mLoader) {
nsCString extension;
mFile.GetURIString(extension);
CutExtension(extension);
mLoader =
nsComponentManagerImpl::gComponentManager->LoaderForExtension(extension);
}
return !!mLoader;
}
bool
nsComponentManagerImpl::KnownModule::Load()
{
if (mFailed) {
return false;
}
if (!mModule) {
if (!EnsureLoader()) {
return false;
}
mModule = mLoader->LoadModule(mFile);
if (!mModule) {
mFailed = true;
return false;
}
}
if (!mLoaded) {
if (mModule->loadProc) {
nsresult rv = mModule->loadProc();
if (NS_FAILED(rv)) {
mFailed = true;
return false;
}
}
mLoaded = true;
}
return true;
}
nsCString
nsComponentManagerImpl::KnownModule::Description() const
{
nsCString s;
if (mFile) {
mFile.GetURIString(s);
} else {
s = "<static module>";
}
return s;
}
nsresult nsComponentManagerImpl::Shutdown(void)
{
MOZ_ASSERT(NORMAL == mStatus);
mStatus = SHUTDOWN_IN_PROGRESS;
// Shutdown the component manager
MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
("nsComponentManager: Beginning Shutdown."));
UnregisterWeakMemoryReporter(this);
// Release all cached factories
mContractIDs.Clear();
mFactories.Clear(); // XXX release the objects, don't just clear
mLoaderMap.Clear();
mKnownModules.Clear();
mKnownStaticModules.Clear();
delete sStaticModules;
delete sModuleLocations;
mStatus = SHUTDOWN_COMPLETE;
MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
("nsComponentManager: Shutdown complete."));
return NS_OK;
}
nsComponentManagerImpl::~nsComponentManagerImpl()
{
MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
("nsComponentManager: Beginning destruction."));
if (SHUTDOWN_COMPLETE != mStatus) {
Shutdown();
}
MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
("nsComponentManager: Destroyed."));
}
NS_IMPL_ISUPPORTS(nsComponentManagerImpl,
nsIComponentManager,
nsIServiceManager,
nsIComponentRegistrar,
nsISupportsWeakReference,
nsIInterfaceRequestor,
nsIMemoryReporter)
nsresult
nsComponentManagerImpl::GetInterface(const nsIID& aUuid, void** aResult)
{
NS_WARNING("This isn't supported");
// fall through to QI as anything QIable is a superset of what can be
// got via the GetInterface()
return QueryInterface(aUuid, aResult);
}
nsFactoryEntry*
nsComponentManagerImpl::GetFactoryEntry(const char* aContractID,
uint32_t aContractIDLen)
{
SafeMutexAutoLock lock(mLock);
return mContractIDs.Get(nsDependentCString(aContractID, aContractIDLen));
}
nsFactoryEntry*
nsComponentManagerImpl::GetFactoryEntry(const nsCID& aClass)
{
SafeMutexAutoLock lock(mLock);
return mFactories.Get(aClass);
}
already_AddRefed<nsIFactory>
nsComponentManagerImpl::FindFactory(const nsCID& aClass)
{
nsFactoryEntry* e = GetFactoryEntry(aClass);
if (!e) {
return nullptr;
}
return e->GetFactory();
}
already_AddRefed<nsIFactory>
nsComponentManagerImpl::FindFactory(const char* aContractID,
uint32_t aContractIDLen)
{
nsFactoryEntry* entry = GetFactoryEntry(aContractID, aContractIDLen);
if (!entry) {
return nullptr;
}
return entry->GetFactory();
}
/**
* GetClassObject()
*
* Given a classID, this finds the singleton ClassObject that implements the CID.
* Returns an interface of type aIID off the singleton classobject.
*/
NS_IMETHODIMP
nsComponentManagerImpl::GetClassObject(const nsCID& aClass, const nsIID& aIID,
void** aResult)
{
nsresult rv;
if (MOZ_LOG_TEST(nsComponentManagerLog, LogLevel::Debug)) {
char* buf = aClass.ToString();
PR_LogPrint("nsComponentManager: GetClassObject(%s)", buf);
if (buf) {
free(buf);
}
}
MOZ_ASSERT(aResult != nullptr);
nsCOMPtr<nsIFactory> factory = FindFactory(aClass);
if (!factory) {
return NS_ERROR_FACTORY_NOT_REGISTERED;
}
rv = factory->QueryInterface(aIID, aResult);
MOZ_LOG(nsComponentManagerLog, LogLevel::Warning,
("\t\tGetClassObject() %s", NS_SUCCEEDED(rv) ? "succeeded" : "FAILED"));
return rv;
}
NS_IMETHODIMP
nsComponentManagerImpl::GetClassObjectByContractID(const char* aContractID,
const nsIID& aIID,
void** aResult)
{
if (NS_WARN_IF(!aResult) ||
NS_WARN_IF(!aContractID)) {
return NS_ERROR_INVALID_ARG;
}
nsresult rv;
MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
("nsComponentManager: GetClassObjectByContractID(%s)", aContractID));
nsCOMPtr<nsIFactory> factory = FindFactory(aContractID, strlen(aContractID));
if (!factory) {
return NS_ERROR_FACTORY_NOT_REGISTERED;
}
rv = factory->QueryInterface(aIID, aResult);
MOZ_LOG(nsComponentManagerLog, LogLevel::Warning,
("\t\tGetClassObjectByContractID() %s", NS_SUCCEEDED(rv) ? "succeeded" : "FAILED"));
return rv;
}
/**
* CreateInstance()
*
* Create an instance of an object that implements an interface and belongs
* to the implementation aClass using the factory. The factory is immediately
* released and not held onto for any longer.
*/
NS_IMETHODIMP
nsComponentManagerImpl::CreateInstance(const nsCID& aClass,
nsISupports* aDelegate,
const nsIID& aIID,
void** aResult)
{
// test this first, since there's no point in creating a component during
// shutdown -- whether it's available or not would depend on the order it
// occurs in the list
if (gXPCOMShuttingDown) {
// When processing shutdown, don't process new GetService() requests
#ifdef SHOW_DENIED_ON_SHUTDOWN
char cid[NSID_LENGTH], iid[NSID_LENGTH];
aClass.ToProvidedString(cid);
aIID.ToProvidedString(iid);
fprintf(stderr, "Creating new instance on shutdown. Denied.\n"
" CID: %s\n IID: %s\n", cid, iid);
#endif /* SHOW_DENIED_ON_SHUTDOWN */
return NS_ERROR_UNEXPECTED;
}
if (!aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = nullptr;
nsFactoryEntry* entry = GetFactoryEntry(aClass);
if (!entry) {
return NS_ERROR_FACTORY_NOT_REGISTERED;
}
#ifdef SHOW_CI_ON_EXISTING_SERVICE
if (entry->mServiceObject) {
char cid[NSID_LENGTH];
aClass.ToProvidedString(cid);
nsAutoCString message;
message = NS_LITERAL_CSTRING("You are calling CreateInstance \"") +
nsDependentCString(cid) +
NS_LITERAL_CSTRING("\" when a service for this CID already exists!");
NS_ERROR(message.get());
}
#endif
nsresult rv;
nsCOMPtr<nsIFactory> factory = entry->GetFactory();
if (factory) {
rv = factory->CreateInstance(aDelegate, aIID, aResult);
if (NS_SUCCEEDED(rv) && !*aResult) {
NS_ERROR("Factory did not return an object but returned success!");
rv = NS_ERROR_SERVICE_NOT_FOUND;
}
} else {
// Translate error values
rv = NS_ERROR_FACTORY_NOT_REGISTERED;
}
if (MOZ_LOG_TEST(nsComponentManagerLog, LogLevel::Warning)) {
char* buf = aClass.ToString();
MOZ_LOG(nsComponentManagerLog, LogLevel::Warning,
("nsComponentManager: CreateInstance(%s) %s", buf,
NS_SUCCEEDED(rv) ? "succeeded" : "FAILED"));
if (buf) {
free(buf);
}
}
return rv;
}
/**
* CreateInstanceByContractID()
*
* A variant of CreateInstance() that creates an instance of the object that
* implements the interface aIID and whose implementation has a contractID aContractID.
*
* This is only a convenience routine that turns around can calls the
* CreateInstance() with classid and iid.
*/
NS_IMETHODIMP
nsComponentManagerImpl::CreateInstanceByContractID(const char* aContractID,
nsISupports* aDelegate,
const nsIID& aIID,
void** aResult)
{
if (NS_WARN_IF(!aContractID)) {
return NS_ERROR_INVALID_ARG;
}
// test this first, since there's no point in creating a component during
// shutdown -- whether it's available or not would depend on the order it
// occurs in the list
if (gXPCOMShuttingDown) {
// When processing shutdown, don't process new GetService() requests
#ifdef SHOW_DENIED_ON_SHUTDOWN
char iid[NSID_LENGTH];
aIID.ToProvidedString(iid);
fprintf(stderr, "Creating new instance on shutdown. Denied.\n"
" ContractID: %s\n IID: %s\n", aContractID, iid);
#endif /* SHOW_DENIED_ON_SHUTDOWN */
return NS_ERROR_UNEXPECTED;
}
if (!aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = nullptr;
nsFactoryEntry* entry = GetFactoryEntry(aContractID, strlen(aContractID));
if (!entry) {
return NS_ERROR_FACTORY_NOT_REGISTERED;
}
#ifdef SHOW_CI_ON_EXISTING_SERVICE
if (entry->mServiceObject) {
nsAutoCString message;
message =
NS_LITERAL_CSTRING("You are calling CreateInstance \"") +
nsDependentCString(aContractID) +
NS_LITERAL_CSTRING("\" when a service for this CID already exists! "
"Add it to abusedContracts to track down the service consumer.");
NS_ERROR(message.get());
}
#endif
nsresult rv;
nsCOMPtr<nsIFactory> factory = entry->GetFactory();
if (factory) {
rv = factory->CreateInstance(aDelegate, aIID, aResult);
if (NS_SUCCEEDED(rv) && !*aResult) {
NS_ERROR("Factory did not return an object but returned success!");
rv = NS_ERROR_SERVICE_NOT_FOUND;
}
} else {
// Translate error values
rv = NS_ERROR_FACTORY_NOT_REGISTERED;
}
MOZ_LOG(nsComponentManagerLog, LogLevel::Warning,
("nsComponentManager: CreateInstanceByContractID(%s) %s", aContractID,
NS_SUCCEEDED(rv) ? "succeeded" : "FAILED"));
return rv;
}
nsresult
nsComponentManagerImpl::FreeServices()
{
NS_ASSERTION(gXPCOMShuttingDown,
"Must be shutting down in order to free all services");
if (!gXPCOMShuttingDown) {
return NS_ERROR_FAILURE;
}
for (auto iter = mFactories.Iter(); !iter.Done(); iter.Next()) {
nsFactoryEntry* entry = iter.UserData();
entry->mFactory = nullptr;
entry->mServiceObject = nullptr;
}
return NS_OK;
}
// This should only ever be called within the monitor!
nsComponentManagerImpl::PendingServiceInfo*
nsComponentManagerImpl::AddPendingService(const nsCID& aServiceCID,
PRThread* aThread)
{
PendingServiceInfo* newInfo = mPendingServices.AppendElement();
if (newInfo) {
newInfo->cid = &aServiceCID;
newInfo->thread = aThread;
}
return newInfo;
}
// This should only ever be called within the monitor!
void
nsComponentManagerImpl::RemovePendingService(const nsCID& aServiceCID)
{
uint32_t pendingCount = mPendingServices.Length();
for (uint32_t index = 0; index < pendingCount; ++index) {
const PendingServiceInfo& info = mPendingServices.ElementAt(index);
if (info.cid->Equals(aServiceCID)) {
mPendingServices.RemoveElementAt(index);
return;
}
}
}
// This should only ever be called within the monitor!
PRThread*
nsComponentManagerImpl::GetPendingServiceThread(const nsCID& aServiceCID) const
{
uint32_t pendingCount = mPendingServices.Length();
for (uint32_t index = 0; index < pendingCount; ++index) {
const PendingServiceInfo& info = mPendingServices.ElementAt(index);
if (info.cid->Equals(aServiceCID)) {
return info.thread;
}
}
return nullptr;
}
NS_IMETHODIMP
nsComponentManagerImpl::GetService(const nsCID& aClass,
const nsIID& aIID,
void** aResult)
{
// test this first, since there's no point in returning a service during
// shutdown -- whether it's available or not would depend on the order it
// occurs in the list
if (gXPCOMShuttingDown) {
// When processing shutdown, don't process new GetService() requests
#ifdef SHOW_DENIED_ON_SHUTDOWN
char cid[NSID_LENGTH], iid[NSID_LENGTH];
aClass.ToProvidedString(cid);
aIID.ToProvidedString(iid);
fprintf(stderr, "Getting service on shutdown. Denied.\n"
" CID: %s\n IID: %s\n", cid, iid);
#endif /* SHOW_DENIED_ON_SHUTDOWN */
return NS_ERROR_UNEXPECTED;
}
// `service` must be released after the lock is released, so it must be
// declared before the lock in this C++ block.
nsCOMPtr<nsISupports> service;
MutexLock lock(mLock);
nsFactoryEntry* entry = mFactories.Get(aClass);
if (!entry) {
return NS_ERROR_FACTORY_NOT_REGISTERED;
}
if (entry->mServiceObject) {
lock.Unlock();
return entry->mServiceObject->QueryInterface(aIID, aResult);
}
PRThread* currentPRThread = PR_GetCurrentThread();
MOZ_ASSERT(currentPRThread, "This should never be null!");
// Needed to optimize the event loop below.
nsIThread* currentThread = nullptr;
PRThread* pendingPRThread;
while ((pendingPRThread = GetPendingServiceThread(aClass))) {
if (pendingPRThread == currentPRThread) {
NS_ERROR("Recursive GetService!");
return NS_ERROR_NOT_AVAILABLE;
}
SafeMutexAutoUnlock unlockPending(mLock);
if (!currentThread) {
currentThread = NS_GetCurrentThread();
MOZ_ASSERT(currentThread, "This should never be null!");
}
// This will process a single event or yield the thread if no event is
// pending.
if (!NS_ProcessNextEvent(currentThread, false)) {
PR_Sleep(PR_INTERVAL_NO_WAIT);
}
}
// It's still possible that the other thread failed to create the
// service so we're not guaranteed to have an entry or service yet.
if (entry->mServiceObject) {
lock.Unlock();
return entry->mServiceObject->QueryInterface(aIID, aResult);
}
#ifdef DEBUG
PendingServiceInfo* newInfo =
#endif
AddPendingService(aClass, currentPRThread);
NS_ASSERTION(newInfo, "Failed to add info to the array!");
// We need to not be holding the service manager's lock while calling
// CreateInstance, because it invokes user code which could try to re-enter
// the service manager:
nsresult rv;
{
SafeMutexAutoUnlock unlock(mLock);
rv = CreateInstance(aClass, nullptr, aIID, getter_AddRefs(service));
}
if (NS_SUCCEEDED(rv) && !service) {
NS_ERROR("Factory did not return an object but returned success");
return NS_ERROR_SERVICE_NOT_FOUND;
}
#ifdef DEBUG
pendingPRThread = GetPendingServiceThread(aClass);
MOZ_ASSERT(pendingPRThread == currentPRThread,
"Pending service array has been changed!");
#endif
RemovePendingService(aClass);
if (NS_FAILED(rv)) {
return rv;
}
NS_ASSERTION(!entry->mServiceObject, "Created two instances of a service!");
entry->mServiceObject = service.forget();
lock.Unlock();
nsISupports** sresult = reinterpret_cast<nsISupports**>(aResult);
*sresult = entry->mServiceObject;
(*sresult)->AddRef();
return NS_OK;
}
NS_IMETHODIMP
nsComponentManagerImpl::IsServiceInstantiated(const nsCID& aClass,
const nsIID& aIID,
bool* aResult)
{
// Now we want to get the service if we already got it. If not, we don't want
// to create an instance of it. mmh!
// test this first, since there's no point in returning a service during
// shutdown -- whether it's available or not would depend on the order it
// occurs in the list
if (gXPCOMShuttingDown) {
// When processing shutdown, don't process new GetService() requests
#ifdef SHOW_DENIED_ON_SHUTDOWN
char cid[NSID_LENGTH], iid[NSID_LENGTH];
aClass.ToProvidedString(cid);
aIID.ToProvidedString(iid);
fprintf(stderr, "Checking for service on shutdown. Denied.\n"
" CID: %s\n IID: %s\n", cid, iid);
#endif /* SHOW_DENIED_ON_SHUTDOWN */
return NS_ERROR_UNEXPECTED;
}
nsresult rv = NS_OK;
nsFactoryEntry* entry;
{
SafeMutexAutoLock lock(mLock);
entry = mFactories.Get(aClass);
}
if (entry && entry->mServiceObject) {
nsCOMPtr<nsISupports> service;
rv = entry->mServiceObject->QueryInterface(aIID, getter_AddRefs(service));
*aResult = (service != nullptr);
} else {
*aResult = false;
}
return rv;
}
NS_IMETHODIMP
nsComponentManagerImpl::IsServiceInstantiatedByContractID(
const char* aContractID,
const nsIID& aIID,
bool* aResult)
{
// Now we want to get the service if we already got it. If not, we don't want
// to create an instance of it. mmh!
// test this first, since there's no point in returning a service during
// shutdown -- whether it's available or not would depend on the order it
// occurs in the list
if (gXPCOMShuttingDown) {
// When processing shutdown, don't process new GetService() requests
#ifdef SHOW_DENIED_ON_SHUTDOWN
char iid[NSID_LENGTH];
aIID.ToProvidedString(iid);
fprintf(stderr, "Checking for service on shutdown. Denied.\n"
" ContractID: %s\n IID: %s\n", aContractID, iid);
#endif /* SHOW_DENIED_ON_SHUTDOWN */
return NS_ERROR_UNEXPECTED;
}
nsresult rv = NS_OK;
nsFactoryEntry* entry;
{
SafeMutexAutoLock lock(mLock);
entry = mContractIDs.Get(nsDependentCString(aContractID));
}
if (entry && entry->mServiceObject) {
nsCOMPtr<nsISupports> service;
rv = entry->mServiceObject->QueryInterface(aIID, getter_AddRefs(service));
*aResult = (service != nullptr);
} else {
*aResult = false;
}
return rv;
}
NS_IMETHODIMP
nsComponentManagerImpl::GetServiceByContractID(const char* aContractID,
const nsIID& aIID,
void** aResult)
{
// test this first, since there's no point in returning a service during
// shutdown -- whether it's available or not would depend on the order it
// occurs in the list
if (gXPCOMShuttingDown) {
// When processing shutdown, don't process new GetService() requests
#ifdef SHOW_DENIED_ON_SHUTDOWN
char iid[NSID_LENGTH];
aIID.ToProvidedString(iid);
fprintf(stderr, "Getting service on shutdown. Denied.\n"
" ContractID: %s\n IID: %s\n", aContractID, iid);
#endif /* SHOW_DENIED_ON_SHUTDOWN */
return NS_ERROR_UNEXPECTED;
}
// `service` must be released after the lock is released, so it must be
// declared before the lock in this C++ block.
nsCOMPtr<nsISupports> service;
MutexLock lock(mLock);
nsFactoryEntry* entry = mContractIDs.Get(nsDependentCString(aContractID));
if (!entry) {
return NS_ERROR_FACTORY_NOT_REGISTERED;
}
if (entry->mServiceObject) {
// We need to not be holding the service manager's monitor while calling
// QueryInterface, because it invokes user code which could try to re-enter
// the service manager, or try to grab some other lock/monitor/condvar
// and deadlock, e.g. bug 282743.
// `entry` is valid until XPCOM shutdown, so we can safely use it after
// exiting the lock.
lock.Unlock();
return entry->mServiceObject->QueryInterface(aIID, aResult);
}
PRThread* currentPRThread = PR_GetCurrentThread();
MOZ_ASSERT(currentPRThread, "This should never be null!");
// Needed to optimize the event loop below.
nsIThread* currentThread = nullptr;
PRThread* pendingPRThread;
while ((pendingPRThread = GetPendingServiceThread(*entry->mCIDEntry->cid))) {
if (pendingPRThread == currentPRThread) {
NS_ERROR("Recursive GetService!");
return NS_ERROR_NOT_AVAILABLE;
}
SafeMutexAutoUnlock unlockPending(mLock);
if (!currentThread) {
currentThread = NS_GetCurrentThread();
MOZ_ASSERT(currentThread, "This should never be null!");
}
// This will process a single event or yield the thread if no event is
// pending.
if (!NS_ProcessNextEvent(currentThread, false)) {
PR_Sleep(PR_INTERVAL_NO_WAIT);
}
}
if (currentThread && entry->mServiceObject) {
// If we have a currentThread then we must have waited on another thread
// to create the service. Grab it now if that succeeded.
lock.Unlock();
return entry->mServiceObject->QueryInterface(aIID, aResult);
}
#ifdef DEBUG
PendingServiceInfo* newInfo =
#endif
AddPendingService(*entry->mCIDEntry->cid, currentPRThread);
NS_ASSERTION(newInfo, "Failed to add info to the array!");
// We need to not be holding the service manager's lock while calling
// CreateInstance, because it invokes user code which could try to re-enter
// the service manager:
nsresult rv;
{
SafeMutexAutoUnlock unlock(mLock);
rv = CreateInstanceByContractID(aContractID, nullptr, aIID,
getter_AddRefs(service));
}
if (NS_SUCCEEDED(rv) && !service) {
NS_ERROR("Factory did not return an object but returned success");
return NS_ERROR_SERVICE_NOT_FOUND;
}
#ifdef DEBUG
pendingPRThread = GetPendingServiceThread(*entry->mCIDEntry->cid);
MOZ_ASSERT(pendingPRThread == currentPRThread,
"Pending service array has been changed!");
#endif
RemovePendingService(*entry->mCIDEntry->cid);
if (NS_FAILED(rv)) {
return rv;
}
NS_ASSERTION(!entry->mServiceObject, "Created two instances of a service!");
entry->mServiceObject = service.forget();
lock.Unlock();
nsISupports** sresult = reinterpret_cast<nsISupports**>(aResult);
*sresult = entry->mServiceObject;
(*sresult)->AddRef();
return NS_OK;
}
already_AddRefed<mozilla::ModuleLoader>
nsComponentManagerImpl::LoaderForExtension(const nsACString& aExt)
{
nsCOMPtr<mozilla::ModuleLoader> loader = mLoaderMap.Get(aExt);
if (!loader) {
loader = do_GetServiceFromCategory("module-loader",
PromiseFlatCString(aExt).get());
if (!loader) {
return nullptr;
}
mLoaderMap.Put(aExt, loader);
}
return loader.forget();
}
NS_IMETHODIMP
nsComponentManagerImpl::RegisterFactory(const nsCID& aClass,
const char* aName,
const char* aContractID,
nsIFactory* aFactory)
{
if (!aFactory) {
// If a null factory is passed in, this call just wants to reset
// the contract ID to point to an existing CID entry.
if (!aContractID) {
return NS_ERROR_INVALID_ARG;
}
SafeMutexAutoLock lock(mLock);
nsFactoryEntry* oldf = mFactories.Get(aClass);
if (!oldf) {
return NS_ERROR_FACTORY_NOT_REGISTERED;
}
mContractIDs.Put(nsDependentCString(aContractID), oldf);
return NS_OK;
}
nsAutoPtr<nsFactoryEntry> f(new nsFactoryEntry(aClass, aFactory));
SafeMutexAutoLock lock(mLock);
if (auto entry = mFactories.LookupForAdd(aClass)) {
return NS_ERROR_FACTORY_EXISTS;
} else {
if (aContractID) {
mContractIDs.Put(nsDependentCString(aContractID), f);
}
entry.OrInsert([&f] () { return f.forget(); });
}
return NS_OK;
}
NS_IMETHODIMP
nsComponentManagerImpl::UnregisterFactory(const nsCID& aClass,
nsIFactory* aFactory)
{
// Don't release the dying factory or service object until releasing
// the component manager monitor.
nsCOMPtr<nsIFactory> dyingFactory;
nsCOMPtr<nsISupports> dyingServiceObject;
{
SafeMutexAutoLock lock(mLock);
auto entry = mFactories.Lookup(aClass);
nsFactoryEntry* f = entry ? entry.Data() : nullptr;
if (!f || f->mFactory != aFactory) {
return NS_ERROR_FACTORY_NOT_REGISTERED;
}
entry.Remove();
// This might leave a stale contractid -> factory mapping in
// place, so null out the factory entry (see
// nsFactoryEntry::GetFactory)
f->mFactory.swap(dyingFactory);
f->mServiceObject.swap(dyingServiceObject);
}
return NS_OK;
}
NS_IMETHODIMP
nsComponentManagerImpl::AutoRegister(nsIFile* aLocation)
{
XRE_AddManifestLocation(NS_EXTENSION_LOCATION, aLocation);
return NS_OK;
}
NS_IMETHODIMP
nsComponentManagerImpl::AutoUnregister(nsIFile* aLocation)
{
NS_ERROR("AutoUnregister not implemented.");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsComponentManagerImpl::RegisterFactoryLocation(const nsCID& aCID,
const char* aClassName,
const char* aContractID,
nsIFile* aFile,
const char* aLoaderStr,
const char* aType)
{
NS_ERROR("RegisterFactoryLocation not implemented.");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsComponentManagerImpl::UnregisterFactoryLocation(const nsCID& aCID,
nsIFile* aFile)
{
NS_ERROR("UnregisterFactoryLocation not implemented.");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsComponentManagerImpl::IsCIDRegistered(const nsCID& aClass,
bool* aResult)
{
*aResult = (nullptr != GetFactoryEntry(aClass));
return NS_OK;
}
NS_IMETHODIMP
nsComponentManagerImpl::IsContractIDRegistered(const char* aClass,
bool* aResult)
{
if (NS_WARN_IF(!aClass)) {
return NS_ERROR_INVALID_ARG;
}
nsFactoryEntry* entry = GetFactoryEntry(aClass, strlen(aClass));
if (entry) {
// UnregisterFactory might have left a stale nsFactoryEntry in
// mContractIDs, so we should check to see whether this entry has
// anything useful.
*aResult = (bool(entry->mModule) ||
bool(entry->mFactory) ||
bool(entry->mServiceObject));
} else {
*aResult = false;
}
return NS_OK;
}
NS_IMETHODIMP
nsComponentManagerImpl::EnumerateCIDs(nsISimpleEnumerator** aEnumerator)
{
nsCOMArray<nsISupports> array;
for (auto iter = mFactories.Iter(); !iter.Done(); iter.Next()) {
const nsID& id = iter.Key();
nsCOMPtr<nsISupportsID> wrapper = new nsSupportsID();
wrapper->SetData(&id);
array.AppendObject(wrapper);
}
return NS_NewArrayEnumerator(aEnumerator, array);
}
NS_IMETHODIMP
nsComponentManagerImpl::EnumerateContractIDs(nsISimpleEnumerator** aEnumerator)
{
auto* array = new nsTArray<nsCString>;
for (auto iter = mContractIDs.Iter(); !iter.Done(); iter.Next()) {
const nsACString& contract = iter.Key();
array->AppendElement(contract);
}
nsCOMPtr<nsIUTF8StringEnumerator> e;
nsresult rv = NS_NewAdoptingUTF8StringEnumerator(getter_AddRefs(e), array);
if (NS_FAILED(rv)) {
return rv;
}
return CallQueryInterface(e, aEnumerator);
}
NS_IMETHODIMP
nsComponentManagerImpl::CIDToContractID(const nsCID& aClass,
char** aResult)
{
NS_ERROR("CIDTOContractID not implemented");
return NS_ERROR_FACTORY_NOT_REGISTERED;
}
NS_IMETHODIMP
nsComponentManagerImpl::ContractIDToCID(const char* aContractID,
nsCID** aResult)
{
{
SafeMutexAutoLock lock(mLock);
nsFactoryEntry* entry = mContractIDs.Get(nsDependentCString(aContractID));
if (entry) {
*aResult = (nsCID*)moz_xmalloc(sizeof(nsCID));
**aResult = *entry->mCIDEntry->cid;
return NS_OK;
}
}
*aResult = nullptr;
return NS_ERROR_FACTORY_NOT_REGISTERED;
}
MOZ_DEFINE_MALLOC_SIZE_OF(ComponentManagerMallocSizeOf)
NS_IMETHODIMP
nsComponentManagerImpl::CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
MOZ_COLLECT_REPORT(
"explicit/xpcom/component-manager", KIND_HEAP, UNITS_BYTES,
SizeOfIncludingThis(ComponentManagerMallocSizeOf),
"Memory used for the XPCOM component manager.");
return NS_OK;
}
size_t
nsComponentManagerImpl::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
const
{
size_t n = aMallocSizeOf(this);
n += mLoaderMap.ShallowSizeOfExcludingThis(aMallocSizeOf);
n += mFactories.ShallowSizeOfExcludingThis(aMallocSizeOf);
for (auto iter = mFactories.ConstIter(); !iter.Done(); iter.Next()) {
n += iter.Data()->SizeOfIncludingThis(aMallocSizeOf);
}
n += mContractIDs.ShallowSizeOfExcludingThis(aMallocSizeOf);
for (auto iter = mContractIDs.ConstIter(); !iter.Done(); iter.Next()) {
// We don't measure the nsFactoryEntry data because it's owned by
// mFactories (which is measured above).
n += iter.Key().SizeOfExcludingThisIfUnshared(aMallocSizeOf);
}
n += sStaticModules->ShallowSizeOfIncludingThis(aMallocSizeOf);
if (sModuleLocations) {
n += sModuleLocations->ShallowSizeOfIncludingThis(aMallocSizeOf);
}
n += mKnownStaticModules.ShallowSizeOfExcludingThis(aMallocSizeOf);
n += mKnownModules.ShallowSizeOfExcludingThis(aMallocSizeOf);
n += mArena.SizeOfExcludingThis(aMallocSizeOf);
n += mPendingServices.ShallowSizeOfExcludingThis(aMallocSizeOf);
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mLoaderMap's keys and values
// - mMon
// - sStaticModules' entries
// - sModuleLocations' entries
// - mKnownStaticModules' entries?
// - mKnownModules' keys and values?
return n;
}
////////////////////////////////////////////////////////////////////////////////
// nsFactoryEntry
////////////////////////////////////////////////////////////////////////////////
nsFactoryEntry::nsFactoryEntry(const mozilla::Module::CIDEntry* aEntry,
nsComponentManagerImpl::KnownModule* aModule)
: mCIDEntry(aEntry)
, mModule(aModule)
{
}
nsFactoryEntry::nsFactoryEntry(const nsCID& aCID, nsIFactory* aFactory)
: mCIDEntry(nullptr)
, mModule(nullptr)
, mFactory(aFactory)
{
auto* e = new mozilla::Module::CIDEntry();
auto* cid = new nsCID;
*cid = aCID;
e->cid = cid;
mCIDEntry = e;
}
nsFactoryEntry::~nsFactoryEntry()
{
// If this was a RegisterFactory entry, we own the CIDEntry/CID
if (!mModule) {
delete mCIDEntry->cid;
delete mCIDEntry;
}
}
already_AddRefed<nsIFactory>
nsFactoryEntry::GetFactory()
{
nsComponentManagerImpl::gComponentManager->mLock.AssertNotCurrentThreadOwns();
if (!mFactory) {
// RegisterFactory then UnregisterFactory can leave an entry in mContractIDs
// pointing to an unusable nsFactoryEntry.
if (!mModule) {
return nullptr;
}
if (!mModule->Load()) {
return nullptr;
}
// Don't set mFactory directly, it needs to be locked
nsCOMPtr<nsIFactory> factory;
if (mModule->Module()->getFactoryProc) {
factory = mModule->Module()->getFactoryProc(*mModule->Module(),
*mCIDEntry);
} else if (mCIDEntry->getFactoryProc) {
factory = mCIDEntry->getFactoryProc(*mModule->Module(), *mCIDEntry);
} else {
NS_ASSERTION(mCIDEntry->constructorProc, "no getfactory or constructor");
factory = new mozilla::GenericFactory(mCIDEntry->constructorProc);
}
if (!factory) {
return nullptr;
}
SafeMutexAutoLock lock(nsComponentManagerImpl::gComponentManager->mLock);
// Threads can race to set mFactory
if (!mFactory) {
factory.swap(mFactory);
}
}
nsCOMPtr<nsIFactory> factory = mFactory;
return factory.forget();
}
size_t
nsFactoryEntry::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
{
size_t n = aMallocSizeOf(this);
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mCIDEntry;
// - mModule;
// - mFactory;
// - mServiceObject;
return n;
}
////////////////////////////////////////////////////////////////////////////////
// Static Access Functions
////////////////////////////////////////////////////////////////////////////////
nsresult
NS_GetComponentManager(nsIComponentManager** aResult)
{
if (!nsComponentManagerImpl::gComponentManager) {
return NS_ERROR_NOT_INITIALIZED;
}
NS_ADDREF(*aResult = nsComponentManagerImpl::gComponentManager);
return NS_OK;
}
nsresult
NS_GetServiceManager(nsIServiceManager** aResult)
{
if (!nsComponentManagerImpl::gComponentManager) {
return NS_ERROR_NOT_INITIALIZED;
}
NS_ADDREF(*aResult = nsComponentManagerImpl::gComponentManager);
return NS_OK;
}
nsresult
NS_GetComponentRegistrar(nsIComponentRegistrar** aResult)
{
if (!nsComponentManagerImpl::gComponentManager) {
return NS_ERROR_NOT_INITIALIZED;
}
NS_ADDREF(*aResult = nsComponentManagerImpl::gComponentManager);
return NS_OK;
}
EXPORT_XPCOM_API(nsresult)
XRE_AddStaticComponent(const mozilla::Module* aComponent)
{
nsComponentManagerImpl::InitializeStaticModules();
nsComponentManagerImpl::sStaticModules->AppendElement(aComponent);
if (nsComponentManagerImpl::gComponentManager &&
nsComponentManagerImpl::NORMAL ==
nsComponentManagerImpl::gComponentManager->mStatus) {
nsComponentManagerImpl::gComponentManager->RegisterModule(aComponent,
nullptr);
}
return NS_OK;
}
NS_IMETHODIMP
nsComponentManagerImpl::AddBootstrappedManifestLocation(nsIFile* aLocation)
{
nsString path;
nsresult rv = aLocation->GetPath(path);
if (NS_FAILED(rv)) {
return rv;
}
if (Substring(path, path.Length() - 4).EqualsLiteral(".xpi")) {
return XRE_AddJarManifestLocation(NS_BOOTSTRAPPED_LOCATION, aLocation);
}
nsCOMPtr<nsIFile> manifest =
CloneAndAppend(aLocation, NS_LITERAL_CSTRING("chrome.manifest"));
return XRE_AddManifestLocation(NS_BOOTSTRAPPED_LOCATION, manifest);
}
NS_IMETHODIMP
nsComponentManagerImpl::RemoveBootstrappedManifestLocation(nsIFile* aLocation)
{
nsCOMPtr<nsIChromeRegistry> cr = mozilla::services::GetChromeRegistryService();
if (!cr) {
return NS_ERROR_FAILURE;
}
nsString path;
nsresult rv = aLocation->GetPath(path);
if (NS_FAILED(rv)) {
return rv;
}
nsComponentManagerImpl::ComponentLocation elem;
elem.type = NS_BOOTSTRAPPED_LOCATION;
if (Substring(path, path.Length() - 4).EqualsLiteral(".xpi")) {
elem.location.Init(aLocation, "chrome.manifest");
} else {
nsCOMPtr<nsIFile> lf =
CloneAndAppend(aLocation, NS_LITERAL_CSTRING("chrome.manifest"));
elem.location.Init(lf);
}
// Remove reference.
nsComponentManagerImpl::sModuleLocations->RemoveElement(elem,
ComponentLocationComparator());
rv = cr->CheckForNewChrome();
return rv;
}
NS_IMETHODIMP
nsComponentManagerImpl::GetManifestLocations(nsIArray** aLocations)
{
NS_ENSURE_ARG_POINTER(aLocations);
*aLocations = nullptr;
if (!sModuleLocations) {
return NS_ERROR_NOT_INITIALIZED;
}
nsCOMPtr<nsIMutableArray> locations = nsArray::Create();
nsresult rv;
for (uint32_t i = 0; i < sModuleLocations->Length(); ++i) {
ComponentLocation& l = sModuleLocations->ElementAt(i);
FileLocation loc = l.location;
nsCString uriString;
loc.GetURIString(uriString);
nsCOMPtr<nsIURI> uri;
rv = NS_NewURI(getter_AddRefs(uri), uriString);
if (NS_SUCCEEDED(rv)) {
locations->AppendElement(uri, false);
}
}
locations.forget(aLocations);
return NS_OK;
}
EXPORT_XPCOM_API(nsresult)
XRE_AddManifestLocation(NSLocationType aType, nsIFile* aLocation)
{
nsComponentManagerImpl::InitializeModuleLocations();
nsComponentManagerImpl::ComponentLocation* c =
nsComponentManagerImpl::sModuleLocations->AppendElement();
c->type = aType;
c->location.Init(aLocation);
if (nsComponentManagerImpl::gComponentManager &&
nsComponentManagerImpl::NORMAL ==
nsComponentManagerImpl::gComponentManager->mStatus) {
nsComponentManagerImpl::gComponentManager->RegisterManifest(aType,
c->location,
false);
}
return NS_OK;
}
EXPORT_XPCOM_API(nsresult)
XRE_AddJarManifestLocation(NSLocationType aType, nsIFile* aLocation)
{
nsComponentManagerImpl::InitializeModuleLocations();
nsComponentManagerImpl::ComponentLocation* c =
nsComponentManagerImpl::sModuleLocations->AppendElement();
c->type = aType;
c->location.Init(aLocation, "chrome.manifest");
if (nsComponentManagerImpl::gComponentManager &&
nsComponentManagerImpl::NORMAL ==
nsComponentManagerImpl::gComponentManager->mStatus) {
nsComponentManagerImpl::gComponentManager->RegisterManifest(aType,
c->location,
false);
}
return NS_OK;
}
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