gecko-dev/xpcom/build/nsXPCOM.h

415 lines
13 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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"
#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(nsAString);
DECL_CLASS(nsACString);
DECL_CLASS(nsISupports);
DECL_CLASS(nsIModule);
DECL_CLASS(nsIComponentManager);
DECL_CLASS(nsIComponentRegistrar);
DECL_CLASS(nsIServiceManager);
DECL_CLASS(nsIFile);
DECL_CLASS(nsILocalFile);
DECL_CLASS(nsIDirectoryServiceProvider);
DECL_CLASS(nsIMemory);
DECL_CLASS(nsIDebug);
#ifdef __cplusplus
namespace mozilla {
struct Module;
}
#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 <CODE>NS_NewLocalFile</CODE> or <CODE>NS_NewNativeLocalFile</CODE>
* 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 result The service manager. You may pass null.
*
* @param binDirectory The directory containing the component
* registry and runtime libraries;
* or use <CODE>nullptr</CODE> to use the working
* directory.
*
* @param appFileLocationProvider The object to be used by Gecko that specifies
* to Gecko where to find profiles, the component
* registry preferences and so on; or use
* <CODE>nullptr</CODE> for the default behaviour.
*
* @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_InitXPCOM2(nsIServiceManager* *result,
nsIFile* binDirectory,
nsIDirectoryServiceProvider* appFileLocationProvider);
/**
* Shutdown XPCOM. You must call this method after you are finished
* using xpcom.
*
* @param servMgr 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.
*
*/
XPCOM_API(nsresult)
NS_ShutdownXPCOM(nsIServiceManager* servMgr);
/**
* Public Method to access to the service manager.
*
* @param result 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* *result);
/**
* Public Method to access to the component manager.
*
* @param result Interface pointer to the service
*
* @return NS_OK for success;
* other error codes indicate a failure during initialisation.
*
*/
XPCOM_API(nsresult)
NS_GetComponentManager(nsIComponentManager* *result);
/**
* Public Method to access to the component registration manager.
*
* @param result Interface pointer to the service
*
* @return NS_OK for success;
* other error codes indicate a failure during initialisation.
*
*/
XPCOM_API(nsresult)
NS_GetComponentRegistrar(nsIComponentRegistrar* *result);
/**
* Public Method to access to the memory manager. See nsIMemory
*
* @param result 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* *result);
/**
* Public Method to create an instance of a nsIFile. This function
* may be called prior to NS_InitXPCOM.
*
* @param path
* 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 followLinks
* 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 result 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 &path,
bool followLinks,
nsIFile* *result);
XPCOM_API(nsresult)
NS_NewNativeLocalFile(const nsACString &path,
bool followLinks,
nsIFile* *result);
#endif
/**
* Allocates a block of memory of a particular size. If the memory cannot
* be allocated (because of an out-of-memory condition), the process aborts.
*
* @param size The size of the block to allocate
* @result The block of memory
* @note This function is thread-safe.
*/
XPCOM_API(void*)
NS_Alloc(size_t size);
/**
* Reallocates a block of memory to a new size.
*
* @param ptr The block of memory to reallocate. This block must originally
have been allocated by NS_Alloc or NS_Realloc
* @param size The new size. If 0, frees the block like NS_Free
* @result The reallocated block of memory
* @note This function is thread-safe.
*
* If ptr is null, this function behaves like NS_Alloc.
* If s is the size of the block to which ptr points, the first min(s, size)
* bytes of ptr's block are copied to the new block. If the allocation
* succeeds, ptr is freed and a pointer to the new block is returned. If the
* allocation fails, the process aborts.
*/
XPCOM_API(void*)
NS_Realloc(void* ptr, size_t size);
/**
* Frees a block of memory. Null is a permissible value, in which case no
* action is taken.
*
* @param ptr The block of memory to free. This block must originally have
* been allocated by NS_Alloc or NS_Realloc
* @note This function is thread-safe.
*/
XPCOM_API(void)
NS_Free(void* ptr);
/**
* 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();
/**
* 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 *n, nsCycleCollectionParticipant *p,
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(nsIDebug* *result);
#endif