/* -*- 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"
#include "mozilla/Atomics.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(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 gXPCOMMainThreadEventsAreDoomed;
#endif
#ifdef __cplusplus
# include "nsStringFwd.h"
#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 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