/* -*- 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/. */ #ifndef nsXPCOM_h__ #define nsXPCOM_h__ #include "nscore.h" #include "nsXPCOMCID.h" #include "mozilla/Attributes.h" #ifdef __cplusplus # define DECL_CLASS(c) class c # define DECL_STRUCT(c) struct c #else # define DECL_CLASS(c) typedef struct c c # define DECL_STRUCT(c) typedef struct c c #endif DECL_CLASS(nsISupports); DECL_CLASS(nsIModule); DECL_CLASS(nsIComponentManager); DECL_CLASS(nsIComponentRegistrar); DECL_CLASS(nsIServiceManager); DECL_CLASS(nsIFile); DECL_CLASS(nsIDirectoryServiceProvider); DECL_CLASS(nsIMemory); DECL_CLASS(nsIDebug2); #ifdef __cplusplus extern bool gXPCOMShuttingDown; extern bool gXPCOMThreadsShutDown; extern bool gXPCOMMainThreadEventsAreDoomed; #endif #ifdef __cplusplus # include "nsStringFwd.h" namespace mozilla { struct Module; } // namespace mozilla #endif /** * Initialises XPCOM. You must call one of the NS_InitXPCOM methods * before proceeding to use xpcom. The one exception is that you may * call NS_NewLocalFile to create a nsIFile. * * @note Use NS_NewLocalFile or NS_NewNativeLocalFile * to create the file object you supply as the bin directory path in this * call. The function may be safely called before the rest of XPCOM or * embedding has been initialised. * * @param aResult The service manager. You may pass null. * * @param aBinDirectory The directory containing the component * registry and runtime libraries; * or use nullptr to use the working * directory. * * @param aAppFileLocationProvider The object to be used by Gecko that * specifies to Gecko where to find profiles, the * component registry preferences and so on; or use * nullptr for the default behaviour. * * @param aInitJSContext Whether the nsXPCJSContext should be initialized at * this point. * * @see NS_NewLocalFile * @see nsIFile * @see nsIDirectoryServiceProvider * * @return NS_OK for success; * NS_ERROR_NOT_INITIALIZED if static globals were not initialized, * which can happen if XPCOM is reloaded, but did not completly * shutdown. Other error codes indicate a failure during * initialisation. */ XPCOM_API(nsresult) NS_InitXPCOM(nsIServiceManager** aResult, nsIFile* aBinDirectory, nsIDirectoryServiceProvider* aAppFileLocationProvider, bool aInitJSContext = true); /** * Initialize only minimal components of XPCOM. This ensures nsThreadManager, * logging, and timers will work. */ XPCOM_API(nsresult) NS_InitMinimalXPCOM(); /** * Shutdown XPCOM. You must call this method after you are finished * using xpcom. * * @param aServMgr The service manager which was returned by * NS_InitXPCOM. This will release servMgr. You may pass null. * * @return NS_OK for success; * other error codes indicate a failure during initialisation. * * MOZ_CAN_RUN_SCRIPT_BOUNDARY for now, but really it should maybe be * MOZ_CAN_RUN_SCRIPT. */ XPCOM_API(MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult) NS_ShutdownXPCOM(nsIServiceManager* aServMgr); /** * Public Method to access to the service manager. * * @param aResult Interface pointer to the service manager * * @return NS_OK for success; * other error codes indicate a failure during initialisation. */ XPCOM_API(nsresult) NS_GetServiceManager(nsIServiceManager** aResult); /** * Public Method to access to the component manager. * * @param aResult Interface pointer to the service * * @return NS_OK for success; * other error codes indicate a failure during initialisation. */ XPCOM_API(nsresult) NS_GetComponentManager(nsIComponentManager** aResult); /** * Public Method to access to the component registration manager. * * @param aResult Interface pointer to the service * * @return NS_OK for success; * other error codes indicate a failure during initialisation. */ XPCOM_API(nsresult) NS_GetComponentRegistrar(nsIComponentRegistrar** aResult); /** * Public Method to access to the memory manager. See nsIMemory * * @param aResult Interface pointer to the memory manager * * @return NS_OK for success; * other error codes indicate a failure during initialisation. */ XPCOM_API(nsresult) NS_GetMemoryManager(nsIMemory** aResult); /** * Public Method to create an instance of a nsIFile. This function * may be called prior to NS_InitXPCOM. * * @param aPath * A string which specifies a full file path to a * location. Relative paths will be treated as an * error (NS_ERROR_FILE_UNRECOGNIZED_PATH). * |NS_NewNativeLocalFile|'s path must be in the * filesystem charset. * @param aFollowLinks * This attribute will determine if the nsLocalFile will auto * resolve symbolic links. By default, this value will be false * on all non unix systems. On unix, this attribute is effectively * a noop. * @param aResult Interface pointer to a new instance of an nsIFile * * @return NS_OK for success; * other error codes indicate a failure. */ #ifdef __cplusplus XPCOM_API(nsresult) NS_NewLocalFile(const nsAString& aPath, bool aFollowLinks, nsIFile** aResult); XPCOM_API(nsresult) NS_NewNativeLocalFile(const nsACString& aPath, bool aFollowLinks, nsIFile** aResult); // Use NS_NewLocalFile if you already have a UTF-16 string. // Otherwise non-ASCII paths will break on some platforms // including Windows. class NS_ConvertUTF16toUTF8; nsresult NS_NewNativeLocalFile(const NS_ConvertUTF16toUTF8& aPath, bool aFollowLinks, nsIFile** aResult) = delete; #endif /** * Support for warnings, assertions, and debugging breaks. */ enum { NS_DEBUG_WARNING = 0, NS_DEBUG_ASSERTION = 1, NS_DEBUG_BREAK = 2, NS_DEBUG_ABORT = 3 }; /** * Print a runtime assertion. This function is available in both debug and * release builds. * * @note Based on the value of aSeverity and the XPCOM_DEBUG_BREAK * environment variable, this function may cause the application to * print the warning, print a stacktrace, break into a debugger, or abort * immediately. * * @param aSeverity A NS_DEBUG_* value * @param aStr A readable error message (ASCII, may be null) * @param aExpr The expression evaluated (may be null) * @param aFile The source file containing the assertion (may be null) * @param aLine The source file line number (-1 indicates no line number) */ XPCOM_API(void) NS_DebugBreak(uint32_t aSeverity, const char* aStr, const char* aExpr, const char* aFile, int32_t aLine); /** * Perform a stack-walk to a debugging log under various * circumstances. Used to aid debugging of leaked object graphs. * * The NS_Log* functions are available in both debug and release * builds of XPCOM, but the output will be useless unless binary * debugging symbols for all modules in the stacktrace are available. */ /** * By default, refcount logging is enabled at NS_InitXPCOM and * refcount statistics are printed at NS_ShutdownXPCOM. NS_LogInit and * NS_LogTerm allow applications to enable logging earlier and delay * printing of logging statistics. They should always be used as a * matched pair. */ XPCOM_API(void) NS_LogInit(); XPCOM_API(void) NS_LogTerm(); #ifdef __cplusplus /** * A helper class that calls NS_LogInit in its constructor and * NS_LogTerm in its destructor. */ class ScopedLogging { public: ScopedLogging() { NS_LogInit(); } ~ScopedLogging() { NS_LogTerm(); } }; #endif /** * Log construction and destruction of objects. Processing tools can use the * stacktraces printed by these functions to identify objects that are being * leaked. * * @param aPtr A pointer to the concrete object. * @param aTypeName The class name of the type * @param aInstanceSize The size of the type */ XPCOM_API(void) NS_LogCtor(void* aPtr, const char* aTypeName, uint32_t aInstanceSize); XPCOM_API(void) NS_LogDtor(void* aPtr, const char* aTypeName, uint32_t aInstanceSize); /** * Log a stacktrace when an XPCOM object's refcount is incremented or * decremented. Processing tools can use the stacktraces printed by these * functions to identify objects that were leaked due to XPCOM references. * * @param aPtr A pointer to the concrete object * @param aNewRefCnt The new reference count. * @param aTypeName The class name of the type * @param aInstanceSize The size of the type */ XPCOM_API(void) NS_LogAddRef(void* aPtr, nsrefcnt aNewRefCnt, const char* aTypeName, uint32_t aInstanceSize); XPCOM_API(void) NS_LogRelease(void* aPtr, nsrefcnt aNewRefCnt, const char* aTypeName); /** * Log reference counting performed by COMPtrs. Processing tools can * use the stacktraces printed by these functions to simplify reports * about leaked objects generated from the data printed by * NS_LogAddRef/NS_LogRelease. * * @param aCOMPtr the address of the COMPtr holding a strong reference * @param aObject the object being referenced by the COMPtr */ XPCOM_API(void) NS_LogCOMPtrAddRef(void* aCOMPtr, nsISupports* aObject); XPCOM_API(void) NS_LogCOMPtrRelease(void* aCOMPtr, nsISupports* aObject); /** * The XPCOM cycle collector analyzes and breaks reference cycles between * participating XPCOM objects. All objects in the cycle must implement * nsCycleCollectionParticipant to break cycles correctly. */ #ifdef __cplusplus class nsCycleCollectionParticipant; class nsCycleCollectingAutoRefCnt; XPCOM_API(void) NS_CycleCollectorSuspect3(void* aPtr, nsCycleCollectionParticipant* aCp, nsCycleCollectingAutoRefCnt* aRefCnt, bool* aShouldDelete); XPCOM_API(void) NS_CycleCollectorSuspectUsingNursery(void* aPtr, nsCycleCollectionParticipant* aCp, nsCycleCollectingAutoRefCnt* aRefCnt, bool* aShouldDelete); #endif /** * Categories (in the category manager service) used by XPCOM: */ /** * A category which is read after component registration but before * the "xpcom-startup" notifications. Each category entry is treated * as the contract ID of a service which implements * nsIDirectoryServiceProvider. Each directory service provider is * installed in the global directory service. */ #define XPCOM_DIRECTORY_PROVIDER_CATEGORY "xpcom-directory-providers" /** * A category which is read after component registration but before * NS_InitXPCOM returns. Each category entry is treated as the contractID of * a service: each service is instantiated, and if it implements nsIObserver * the nsIObserver.observe method is called with the "xpcom-startup" topic. */ #define NS_XPCOM_STARTUP_CATEGORY "xpcom-startup" /** * Observer topics (in the observer service) used by XPCOM: */ /** * At XPCOM startup after component registration is complete, the * following topic is notified. In order to receive this notification, * component must register their contract ID in the category manager, * * @see NS_XPCOM_STARTUP_CATEGORY */ #define NS_XPCOM_STARTUP_OBSERVER_ID "xpcom-startup" /** * At XPCOM shutdown, this topic is notified just before "xpcom-shutdown". * Components should only use this to mark themselves as 'being destroyed'. * Nothing should be dispatched to any event loop. */ #define NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID "xpcom-will-shutdown" /** * At XPCOM shutdown, this topic is notified. All components must * release any interface references to objects in other modules when * this topic is notified. */ #define NS_XPCOM_SHUTDOWN_OBSERVER_ID "xpcom-shutdown" /** * This topic is notified when an entry was added to a category in the * category manager. The subject of the notification will be the name of * the added entry as an nsISupportsCString, and the data will be the * name of the category. The notification will occur on the main thread. */ #define NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID "xpcom-category-entry-added" /** * This topic is notified when an entry was removed from a category in the * category manager. The subject of the notification will be the name of * the removed entry as an nsISupportsCString, and the data will be the * name of the category. The notification will occur on the main thread. */ #define NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID \ "xpcom-category-entry-removed" /** * This topic is notified when an a category was cleared in the category * manager. The subject of the notification will be the category manager, * and the data will be the name of the cleared category. * The notification will occur on the main thread. */ #define NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID "xpcom-category-cleared" XPCOM_API(nsresult) NS_GetDebug(nsIDebug2** aResult); #endif