Mozilla/mozilla/xpcom/components/nsRepository.cpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL.  You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation.  Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation.  All Rights
* Reserved.
*/

#include <stdlib.h>

#ifndef XP_MAC
// including this on mac causes odd link errors in static initialization
// stuff that we (pinkerton & scc) don't yet understand. If you want to
// turn this on for mac, talk to one of us.
#include <iostream.h>
#endif

#include "plstr.h"
#include "prlink.h"
#include "prsystem.h"
#include "nsRepository.h"

#ifdef USE_NSREG
#define XP_BEGIN_PROTOS extern "C" {
#define XP_END_PROTOS };
#include "NSReg.h"
#endif

#if 0
#ifdef XP_MAC
#ifdef MOZ_NGLAYOUT
#define IMPL_MAC_REPOSITORY
#include "nsMacRepository.h"
#endif
#endif
#endif

#include "xcDllStore.h"
#include "nsIServiceManager.h"

nsHashtable *nsRepository::factories = NULL;
PRMonitor *nsRepository::monitor = NULL;
nsDllStore *nsRepository::dllStore = NULL;

static PRLogModuleInfo *logmodule = NULL;

static NS_DEFINE_IID(kFactory2IID, NS_IFACTORY2_IID);

class FactoryEntry {
public:
	nsCID cid;
	nsIFactory *factory;
	
	// DO NOT DELETE THIS. Many FactoryEntry(s) could be sharing the same Dll.
	// This gets deleted from the dllStore going away.
	nsDll *dll;	
	
	FactoryEntry(const nsCID &aClass, nsIFactory *aFactory,
		const char *aLibrary)
		: cid(aClass), factory(aFactory), dll(NULL)
	{
		nsDllStore *dllCollection = nsRepository::dllStore;
		
		if (aLibrary == NULL)
		{
			return;
		}
		
		// If dll not already in dllCollection, add it.
		// PR_EnterMonitor(nsRepository::monitor);
		dll = dllCollection->Get(aLibrary);
		// PR_ExitMonitor(nsRepository::monitor);
		
		if (dll == NULL)
		{
			// Add a new Dll into the nsDllStore
			dll = new nsDll(aLibrary);
			if (dll->GetStatus() != DLL_OK)
			{
				// Cant create a nsDll. Backoff.
				delete dll;
				dll = NULL;
			}
			else
			{
				// PR_EnterMonitor(nsRepository::monitor);
				dllCollection->Put(aLibrary, dll);
				// PR_ExitMonitor(nsRepository::monitor);
			}
		}
	}
	
	~FactoryEntry(void)
	{
		if (factory != NULL)
		{
			factory->Release();
		}
		// DO NOT DELETE nsDll *dll;
	}
};

class IDKey: public nsHashKey {
private:
	nsID id;
	
public:
	IDKey(const nsID &aID) { id = aID; }
	
	PRUint32 HashValue(void) const { return id.m0; }
	
	PRBool Equals(const nsHashKey *aKey) const
	{
		return (id.Equals(((const IDKey *) aKey)->id));
	}
	
	nsHashKey *Clone(void) const { return new IDKey(id); }
};

#ifdef USE_NSREG
#define USE_REGISTRY

static nsresult platformRegister(const nsCID &aCID, const char *aLibrary)
{
	HREG hreg;
	REGERR err = NR_RegOpen(NULL, &hreg);
	if (err == REGERR_OK)
	{
		RKEY key;
		err = NR_RegAddKey(hreg, ROOTKEY_COMMON, 
			"Classes", &key);
		if (err == REGERR_OK)
		{
			char *cidString = aCID.ToString();
			err = NR_RegSetEntryString(hreg, key, cidString, (char *) aLibrary);
			delete [] cidString;
		}
		NR_RegClose(hreg);
	}
	
	return err;
}

static nsresult platformUnregister(const nsCID &aCID, const char *aLibrary) 
{  
	HREG hreg;
	REGERR err = NR_RegOpen(NULL, &hreg);
	if (err == REGERR_OK)
	{
		RKEY key;
		err = NR_RegAddKey(hreg, ROOTKEY_COMMON, "Classes", &key);
		if (err == REGERR_OK)
		{
			char *cidString = aCID.ToString();
			err = NR_RegDeleteEntry(hreg, key, cidString);
			delete [] cidString;
		}
		NR_RegClose(hreg);
	}
	return err;
}

static FactoryEntry *platformFind(const nsCID &aCID)
{
	FactoryEntry *res = NULL;
	HREG hreg;
	REGERR err = NR_RegOpen(NULL, &hreg);
	if (err == REGERR_OK)
	{
		RKEY key;
		err = NR_RegGetKey(hreg, ROOTKEY_COMMON, "Classes", &key);
		if (err == REGERR_OK) {
			char *cidString = aCID.ToString();
			char library[256];
			uint32 len = 256;
			err = NR_RegGetEntryString(hreg, key, cidString, library, len);
			
			delete [] cidString;
			if (err == REGERR_OK) {
				res = new FactoryEntry(aCID, NULL, library);
			}
		}
		NR_RegClose(hreg);
	}
	return res;
}
#endif // USE_NSREG

nsresult nsRepository::loadFactory(FactoryEntry *aEntry,
								   nsIFactory **aFactory)
{
	if (aFactory == NULL)
	{
		return NS_ERROR_NULL_POINTER;
	}
	*aFactory = NULL;
	
	if (aEntry->dll->IsLoaded() == PR_FALSE)
	{
		// Load the dll
		PR_LOG(logmodule, PR_LOG_ALWAYS, 
			("nsRepository: + Loading \"%s\".", aEntry->dll->GetFullPath()));
		if (aEntry->dll->Load() == PR_FALSE)
		{
			PR_LOG(logmodule, PR_LOG_ERROR,
				("nsRepository: Library load unsuccessful."));
			return (NS_ERROR_FAILURE);
		}
	}
	
#ifdef MOZ_TRACE_XPCOM_REFCNT
	// Inform refcnt tracer of new library so that calls through the
	// new library can be traced.
	nsTraceRefcnt::LoadLibrarySymbols(aEntry->dll->GetFullPath(), aEntry->dll->GetInstance());
#endif
	nsFactoryProc proc = (nsFactoryProc) aEntry->dll->FindSymbol("NSGetFactory");
	if (proc != NULL)
	{
		nsIServiceManager* serviceMgr = NULL;
		nsresult res = nsServiceManager::GetGlobalServiceManager(&serviceMgr);
		if (res == NS_OK)
		{
			res = proc(aEntry->cid, serviceMgr, aFactory);
		}
		return res;
	}
	PR_LOG(logmodule, PR_LOG_ERROR, 
		("nsRepository: NSGetFactory entrypoint not found."));
	return NS_ERROR_FACTORY_NOT_LOADED;
}

nsresult nsRepository::FindFactory(const nsCID &aClass,
                                   nsIFactory **aFactory) 
{
	checkInitialized();
	if (PR_LOG_TEST(logmodule, PR_LOG_ALWAYS))
	{
		char *buf = aClass.ToString();
		PR_LogPrint("nsRepository:   Finding Factory.");
		PR_LogPrint("nsRepository:   + %s", 
			buf);
		delete [] buf;
	}
	
	if (aFactory == NULL)
	{
		PR_LOG(logmodule, PR_LOG_ERROR, ("nsRepository:   !! NULL pointer."));
		return NS_ERROR_NULL_POINTER;
	}
	
	PR_EnterMonitor(monitor);
	
	nsIDKey key(aClass);
	FactoryEntry *entry = (FactoryEntry*) factories->Get(&key);
	
	nsresult res = NS_ERROR_FACTORY_NOT_REGISTERED;
	
#ifdef USE_REGISTRY
	if (entry == NULL)
	{
		entry = platformFind(aClass);
		// If we got one, cache it in our hashtable
		if (entry != NULL)
		{
			factories->Put(&key, entry);
		}
	}
#endif
	
	PR_ExitMonitor(monitor);
	
	if (entry != NULL)
	{
		if ((entry)->factory == NULL)
		{
			res = loadFactory(entry, aFactory);
		} else
		{
			*aFactory = entry->factory;
			(*aFactory)->AddRef();
			res = NS_OK;
		}
	}
	
	PR_LOG(logmodule, PR_LOG_WARNING, ("nsRepository:   ! Find Factory %s",
		res == NS_OK ? "succeeded" : "failed"));
	
	return res;
}

nsresult nsRepository::checkInitialized(void) 
{
	nsresult res = NS_OK;
	if (factories == NULL)
	{
		res = Initialize();
	}
	return res;
}

nsresult nsRepository::Initialize(void) 
{
	if (factories == NULL)
	{
		factories = new nsHashtable();
	}
	if (monitor == NULL)
	{
		monitor = PR_NewMonitor();
	}
	if (logmodule == NULL)
	{
		logmodule = PR_NewLogModule("nsRepository");
	}
	if (dllStore == NULL)
	{
		dllStore = new nsDllStore();
	}
	
	PR_LOG(logmodule, PR_LOG_ALWAYS, ("nsRepository: Initialized."));
#ifdef USE_NSREG
	NR_StartupRegistry();
#endif
	
	// Initiate autoreg
	AutoRegister(NS_Startup, NULL);
	
	return NS_OK;
}

nsresult nsRepository::CreateInstance(const nsCID &aClass, 
                                      nsISupports *aDelegate,
                                      const nsIID &aIID,
                                      void **aResult)
{
	checkInitialized();
	if (PR_LOG_TEST(logmodule, PR_LOG_ALWAYS))
	{
		char *buf = aClass.ToString();
		PR_LogPrint("nsRepository: Creating Instance.");
		PR_LogPrint("nsRepository: + %s", buf);
		delete [] buf;
	}
	if (aResult == NULL)
	{
		return NS_ERROR_NULL_POINTER;
	}
	*aResult = NULL;
	
	nsIFactory *factory = NULL;
	nsresult res = FindFactory(aClass, &factory);
	if (NS_SUCCEEDED(res))
	{
		res = factory->CreateInstance(aDelegate, aIID, aResult);
		factory->Release();
		
		return res;
	}
	
	return NS_ERROR_FACTORY_NOT_REGISTERED;
}

nsresult nsRepository::CreateInstance2(const nsCID &aClass, 
                                       nsISupports *aDelegate,
                                       const nsIID &aIID,
                                       void *aSignature,
                                       void **aResult)
{
	if (PR_LOG_TEST(logmodule, PR_LOG_ALWAYS))
	{
		char *buf = aClass.ToString();
		PR_LogPrint("nsRepository: Creating Instance.");
		PR_LogPrint("nsRepository: + %s.", 
			buf);
		PR_LogPrint("nsRepository: + Signature = %p.",
			aSignature);
		delete [] buf;
	}
	if (aResult == NULL)
	{
		return NS_ERROR_NULL_POINTER;
	}
	*aResult = NULL;
	
	nsIFactory *factory = NULL;
	
	nsresult res = FindFactory(aClass, &factory);
	
	if (NS_SUCCEEDED(res))
	{
		nsIFactory2 *factory2 = NULL;
		res = NS_ERROR_FACTORY_NO_SIGNATURE_SUPPORT;
		
		factory->QueryInterface(kFactory2IID, (void **) &factory2);
		
		if (factory2 != NULL)
		{
			res = factory2->CreateInstance2(aDelegate, aIID, aSignature, aResult);
			factory2->Release();
		}
		
		factory->Release();
		return res;
	}
	
	return NS_ERROR_FACTORY_NOT_REGISTERED;
}

nsresult nsRepository::RegisterFactory(const nsCID &aClass,
                                       nsIFactory *aFactory, 
                                       PRBool aReplace)
{
	checkInitialized();
	if (PR_LOG_TEST(logmodule, PR_LOG_ALWAYS))
	{
		char *buf = aClass.ToString();
		PR_LogPrint("nsRepository: Registering Factory.");
		PR_LogPrint("nsRepository: + %s", buf);
		PR_LogPrint("nsRepository: + Replace = %d.", (int) aReplace);
		delete [] buf;
	}
	
	nsIFactory *old = NULL;
	FindFactory(aClass, &old);
	
	if (old != NULL)
	{
		old->Release();
		if (!aReplace)
		{
			PR_LOG(logmodule, PR_LOG_WARNING,
				("nsRepository: ! Factory already registered."));
			return NS_ERROR_FACTORY_EXISTS;
		}
	}
	
	PR_EnterMonitor(monitor);
	
	nsIDKey key(aClass);
	factories->Put(&key, new FactoryEntry(aClass, aFactory, NULL));
	
	PR_ExitMonitor(monitor);
	
	PR_LOG(logmodule, PR_LOG_WARNING,
		("nsRepository: ! Factory register succeeded."));
	
	return NS_OK;
}

nsresult nsRepository::RegisterFactory(const nsCID &aClass,
                                       const char *aLibrary,
                                       PRBool aReplace,
                                       PRBool aPersist)
{
	checkInitialized();
	if (PR_LOG_TEST(logmodule, PR_LOG_ALWAYS))
	{
		char *buf = aClass.ToString();
		PR_LogPrint("nsRepository: Registering Factory.");
		PR_LogPrint("nsRepository: + %s in \"%s\".", buf, aLibrary);
		PR_LogPrint("nsRepository: + Replace = %d, Persist = %d.",
			(int) aReplace, (int) aPersist);
		delete [] buf;
	}
	nsIFactory *old = NULL;
	FindFactory(aClass, &old);
	
	if (old != NULL)
	{
		old->Release();
		if (!aReplace) {
			PR_LOG(logmodule, PR_LOG_WARNING,
				("nsRepository: ! Factory already registered."));
			return NS_ERROR_FACTORY_EXISTS;
		}
	}
	
	PR_EnterMonitor(monitor);
	
#ifdef USE_REGISTRY
	if (aPersist == PR_TRUE)
	{
		platformRegister(aClass, aLibrary);
	} 
	else
#endif
	{
		nsIDKey key(aClass);
		factories->Put(&key, new FactoryEntry(aClass, NULL, aLibrary));
	}
	
	PR_ExitMonitor(monitor);
	
	PR_LOG(logmodule, PR_LOG_WARNING,
		("nsRepository: ! Factory register succeeded."));
	
	return NS_OK;
}

nsresult nsRepository::UnregisterFactory(const nsCID &aClass,
                                         nsIFactory *aFactory)
{
	checkInitialized();
	if (PR_LOG_TEST(logmodule, PR_LOG_ALWAYS)) 
	{
		char *buf = aClass.ToString();
		PR_LogPrint("nsRepository: Unregistering Factory.");
		PR_LogPrint("nsRepository: + %s.", buf);
		delete [] buf;
	}
	
	nsIFactory *old = NULL;
	FindFactory(aClass, &old);
	
	nsresult res = NS_ERROR_FACTORY_NOT_REGISTERED;
	if (old != NULL)
	{
		if (old == aFactory)
		{
			PR_EnterMonitor(monitor);
			
			nsIDKey key(aClass);
			FactoryEntry *entry = (FactoryEntry *) factories->Remove(&key);
			delete entry;
			
			PR_ExitMonitor(monitor);
			
			res = NS_OK;
		}
		old->Release();
	}

	PR_LOG(logmodule, PR_LOG_WARNING,
		("nsRepository: ! Factory unregister %s.", 
		res == NS_OK ? "succeeded" : "failed"));
	
	return res;
}

nsresult nsRepository::UnregisterFactory(const nsCID &aClass,
                                         const char *aLibrary)
{
	checkInitialized();
	if (PR_LOG_TEST(logmodule, PR_LOG_ALWAYS))
	{
		char *buf = aClass.ToString();
		PR_LogPrint("nsRepository: Unregistering Factory.");
		PR_LogPrint("nsRepository: + %s in \"%s\".", buf, aLibrary);
		delete [] buf;
	}
	
	nsIDKey key(aClass);
	FactoryEntry *old = (FactoryEntry *) factories->Get(&key);
	
	nsresult res = NS_ERROR_FACTORY_NOT_REGISTERED;
	
	PR_EnterMonitor(monitor);
	
	if (old != NULL)
	{
		if (old->dll->GetFullPath() != NULL &&
#ifdef XP_UNIX
			PL_strcasecmp(old->dll->GetFullPath(), aLibrary)
#else
			PL_strcmp(old->dll->GetFullPath(), aLibrary)
#endif
			)
		{
			FactoryEntry *entry = (FactoryEntry *) factories->Remove(&key);
			delete entry;
			res = NS_OK;
		}
	}
#ifdef USE_REGISTRY
	res = platformUnregister(aClass, aLibrary);
#endif
	
	PR_ExitMonitor(monitor);
	
	PR_LOG(logmodule, PR_LOG_WARNING,
		("nsRepository: ! Factory unregister %s.", 
		res == NS_OK ? "succeeded" : "failed"));
	
	return res;
}

static PRBool freeLibraryEnum(nsHashKey *aKey, void *aData, void* closure) 
{
	FactoryEntry *entry = (FactoryEntry *) aData;
	
	if (entry->dll->IsLoaded() == PR_TRUE)
	{
		nsCanUnloadProc proc = (nsCanUnloadProc) entry->dll->FindSymbol("NSCanUnload");
		if (proc != NULL)
		{
			PRBool res = proc();
			if (res)
			{
				PR_LOG(logmodule, PR_LOG_ALWAYS, 
					("nsRepository: + Unloading \"%s\".", entry->dll->GetFullPath()));
				entry->dll->Unload();
			}
		}    
	}
	
	return PR_TRUE;
}

nsresult nsRepository::FreeLibraries(void) 
{
	PR_EnterMonitor(monitor);
	
	PR_LOG(logmodule, PR_LOG_ALWAYS, 
		("nsRepository: Freeing Libraries."));
	factories->Enumerate(freeLibraryEnum);
	
	PR_ExitMonitor(monitor);
	
	return NS_OK;
}


/**
 * AutoRegister(RegistrationInstant, const char *pathlist)
 *
 * Given a ; separated list of paths, this will ensure proper registration
 * of all components. A default pathlist is maintained in the registry at
 *		\\HKEYROOT_COMMON\\Classes\\PathList
 * In addition to looking at the pathlist, the default pathlist is looked at.
 *
 * This will take care not loading already registered dlls, finding and
 * registering new dlls, re-registration of modified dlls
 *
 */

nsresult nsRepository::AutoRegister(NSRegistrationInstant when,
									const char* pathlist)
{
	if (pathlist != NULL)
	{
		SyncComponentsInPathList(pathlist);
	}
	
	//XXX get default pathlist from registry
	//XXX Temporary hack. Registering components from current directory
	const char *defaultPathList = ".";
	SyncComponentsInPathList(defaultPathList);
	return (NS_OK);
}


nsresult nsRepository::AddToDefaultPathList(const char *pathlist)
{
	//XXX add pathlist to the defaultpathlist in the registrys
	return (NS_ERROR_FAILURE);
}

nsresult nsRepository::SyncComponentsInPathList(const char *pathlist)
{
#ifndef XP_UNIX
	char *paths = PL_strdup(pathlist);
	
	if (paths == NULL || *paths == '\0')
		return(NS_ERROR_FAILURE);
	
	char *pathsMem = paths;
	while (paths != NULL)
	{
		char *nextpath = PL_strchr(paths, NS_PATH_SEPARATOR);
		if (nextpath != NULL) *nextpath = '\0';
		SyncComponentsInDir(paths);
		paths = nextpath;
	}
	PL_strfree(pathsMem);
#endif
	return (NS_OK);
}

nsresult nsRepository::SyncComponentsInDir(const char *dir)
{
	PRDir *prdir = PR_OpenDir(dir);
	if (prdir == NULL)
		return (NS_ERROR_FAILURE);
	
	// Create a buffer that has dir/ in it so we can append
	// the filename each time in the loop
	char fullname[NS_MAX_FILENAME_LEN];
	PL_strncpyz(fullname, dir, sizeof(fullname));
	unsigned int n = strlen(fullname);
	if (n+1 < sizeof(fullname))
	{
		fullname[n] = PR_GetDirectorySeparator();
		n++;
	}
	char *filepart = fullname + n;
	
	PRDirEntry *dirent = NULL;
	while ((dirent = PR_ReadDir(prdir, PR_SKIP_BOTH)) != NULL)
	{
		PL_strncpyz(filepart, dirent->name, sizeof(fullname)-n);
		nsresult ret = SyncComponentsInFile(fullname);
		if (NS_FAILED(ret) &&
			NS_ERROR_GET_CODE(ret) == NS_XPCOM_ERRORCODE_IS_DIR)
		{
			SyncComponentsInDir(fullname);
		}
	} // foreach file
	PR_CloseDir(prdir);
	return (NS_OK);
}

nsresult nsRepository::SyncComponentsInFile(const char *fullname)
{
	const char *ValidDllExtensions[] = {
		".dll",	/* Windows */
		".dso",	/* Unix */
		".so",	/* Unix */
		".sl",	/* Unix: HP */
		"_dll",	/* Mac ? */
		".dlm",	/* new for all platforms */
		NULL
	};
	
	
	PRFileInfo64 statbuf;
	if (PR_GetFileInfo64(fullname, &statbuf) != PR_SUCCESS)
	{
		// Skip files that cannot be stat
		return (NS_ERROR_FAILURE);
	}
	if (statbuf.type == PR_FILE_DIRECTORY)
	{
		// Cant register a directory
		return (NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_XPCOM,
			NS_XPCOM_ERRORCODE_IS_DIR));
	}
	else if (statbuf.type != PR_FILE_FILE)
	{
		// Skip non-files
		return (NS_ERROR_FAILURE);
	}
	
	// deal with only files that have the right extension
	PRBool validExtension = PR_FALSE;
	int flen = PL_strlen(fullname);
	for (int i=0; ValidDllExtensions[i] != NULL; i++)
	{
		int extlen = PL_strlen(ValidDllExtensions[i]);
		
		// Does fullname end with this extension
		if (flen >= extlen &&
			!PL_strcasecmp(&(fullname[flen - extlen]), ValidDllExtensions[i])
			)
		{
			validExtension = PR_TRUE;
			break;
		}
	}
	
	if (validExtension == PR_FALSE)
	{
		// Skip invalid extensions
		return (NS_ERROR_FAILURE);
	}
	
	// Check if dll is one that we have already seen
	nsDll *dll = dllStore->Get(fullname);
	if (dll == NULL)
	{
		// XXX Create nsDll for this from registry and
		// XXX add it to our dll cache dllStore.
	}
	
	if (dll != NULL)
	{
		// Make sure the dll is OK
		if (dll->GetStatus() != NS_OK)
		{
			PR_LOG(logmodule, PR_LOG_ALWAYS, 
				("nsRepository: + nsDll not NS_OK \"%s\". Skipping...",
				dll->GetFullPath()));
			return (NS_ERROR_FAILURE);
		}
		
		// We already have seen this dll. Check if this dll changed
		if (LL_EQ(dll->GetLastModifiedTime(), statbuf.modifyTime) &&
			LL_EQ(dll->GetSize(), statbuf.size))
		{
			// Dll hasn't changed. Skip.
			PR_LOG(logmodule, PR_LOG_ALWAYS, 
				("nsRepository: + nsDll not changed and already "
				"registered \"%s\". Skipping...",
				dll->GetFullPath()));
			return (NS_OK);
		}
		
		// Aagh! the dll has changed since the last time we saw it.
		// re-register dll
		if (dll->IsLoaded())
		{
			// We are screwed. We loaded the old version of the dll
			// and now we find that the on-disk copy if newer.
			// The only thing to do would be to ask the dll if it can
			// unload itself. It can do that if it hasn't created objects
			// yet.
			nsCanUnloadProc proc = (nsCanUnloadProc)
				dll->FindSymbol("NSCanUnload");
			if (proc != NULL)
			{
				PRBool res = proc(/*PR_TRUE*/);
				if (res)
				{
					PR_LOG(logmodule, PR_LOG_ALWAYS, 
						("nsRepository: + Unloading \"%s\".",
						dll->GetFullPath()));
					dll->Unload();
				}
				else
				{
					// THIS IS THE WORST SITUATION TO BE IN.
					// Dll doesn't want to be unloaded. Cannot re-register
					// this dll.
					PR_LOG(logmodule, PR_LOG_ALWAYS,
						("nsRepository: *** Dll already loaded. "
						"Cannot unload either. Hence cannot re-register "
						"\"%s\". Skipping...", dll->GetFullPath()));
					return (NS_ERROR_FAILURE);
				}
			}
			
		} // dll isloaded
		
		// Sanity.
		if (dll->IsLoaded())
		{
			// We went through all the above to make sure the dll
			// is unloaded. And here we are with the dll still
			// loaded. Whoever taught dp programming...
			PR_LOG(logmodule, PR_LOG_ALWAYS,
				("nsRepository: Dll still loaded. Cannot re-register "
				"\"%s\". Skipping...", dll->GetFullPath()));
			return (NS_ERROR_FAILURE);
		}
	} // dll != NULL
	else
	{
		// Create and add the dll to the dllStore
		// It is ok to do this even if the creation of nsDll
		// didnt succeed. That way we wont do this again
		// when we encounter the same dll.
		dll = new nsDll(fullname);
		dllStore->Put(fullname, dll);
	} // dll == NULL
	
	// Either we are seeing the dll for the first time or the dll has
	// changed since we last saw it and it is unloaded successfully.
	//
	// Now we can try register the dll for sure. 
	nsresult res = SelfRegisterDll(dll);
	nsresult ret = NS_OK;
	if (NS_FAILED(res))
	{
		PR_LOG(logmodule, PR_LOG_ALWAYS,
			("nsRepository: Autoregistration FAILED for "
			"\"%s\". Skipping...", dll->GetFullPath()));
		// XXX Mark dll as not xpcom dll along with modified time
		// XXX and size in the registry so that in the next
		// XXX session, we wont do all this again until
		// XXX the dll changes.
		ret = NS_ERROR_FAILURE;
	}
	else
	{
		PR_LOG(logmodule, PR_LOG_ALWAYS,
			("nsRepository: Autoregistration Passed for "
			"\"%s\". Skipping...", dll->GetFullPath()));
		// XXX Mark dll along with modified time and size in the
		// XXX registry.
	}
	return (ret);
}


/*
* SelfRegisterDll
*
* Given a dll abstraction, this will load, selfregister the dll and
* unload the dll.
*
*/
nsresult nsRepository::SelfRegisterDll(nsDll *dll)
{
	// Precondition: dll is not loaded already
	PR_ASSERT(dll->IsLoaded() == PR_FALSE);
	
	if (dll->Load() == PR_FALSE)
	{
		// Cannot load. Probably not a dll.
		return(NS_ERROR_FAILURE);
	}
	
	nsRegisterProc regproc = (nsRegisterProc)dll->FindSymbol("NSRegisterSelf");
	nsresult res;
	
	if (regproc == NULL)
	{
		// Smart registration
		NSQuickRegisterData qr = (NSQuickRegisterData)dll->FindSymbol(
			NS_QUICKREGISTER_DATA_SYMBOL);
		if (qr == NULL)
		{
			return(NS_ERROR_NO_INTERFACE);
		}
		// XXX register the quick registration data on behalf of the dll
	}
	else
	{
		// Call the NSRegisterSelfProc to enable dll registration
		nsIServiceManager* serviceMgr = NULL;
		nsresult res = nsServiceManager::GetGlobalServiceManager(&serviceMgr);
		if (res == NS_OK)
		{
			res = regproc(/* serviceMgr, */ dll->GetFullPath());
		}
		dll->Unload();
	}
	return (res);
}


nsresult nsRepository::SelfUnregisterDll(nsDll *dll)
{
	// Precondition: dll is not loaded
	PR_ASSERT(dll->IsLoaded() == PR_FALSE);
	
	if (dll->Load() == PR_FALSE)
	{
		// Cannot load. Probably not a dll.
		return(NS_ERROR_FAILURE);
	}
	
	nsUnregisterProc unregproc =
		(nsUnregisterProc) dll->FindSymbol("NSUnregisterSelf");
	nsresult res = NS_OK;
	
	if (unregproc == NULL)
	{
		// Smart unregistration
		NSQuickRegisterData qr = (NSQuickRegisterData)
			dll->FindSymbol(NS_QUICKREGISTER_DATA_SYMBOL);
		if (qr == NULL)
		{
			return(NS_ERROR_NO_INTERFACE);
		}
		// XXX unregister the dll based on the quick registration data
	}
	else
	{
		// Call the NSUnregisterSelfProc to enable dll de-registration
		nsIServiceManager* serviceMgr = NULL;
		res = nsServiceManager::GetGlobalServiceManager(&serviceMgr);
		if (res == NS_OK)
		{
			res = unregproc(/* serviceMgr, */dll->GetFullPath());
		}
		dll->Unload();
	}
	return (res);
}