gecko-dev/xpcom/glue/standalone/nsXPCOMGlue.cpp

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#include "nspr.h"
#include "prlink.h"
#include "nsMemory.h"
#include "nsXPCOMPrivate.h"

#if defined(XP_WIN32)
#include <windows.h>   // for SetProcessWorkingSetSize()
#include <malloc.h>    // for _heapmin()
#endif

static PRLibrary *xpcomLib = nsnull;
static XPCOMFunctions *xpcomFunctions = nsnull;

#ifdef DEBUG_dougt
#define XPCOM_GLUE_FLUSH_HEAP
#endif

//#define XPCOM_GLUE_NO_DYNAMIC_LOADING

// seawood tells me there isn't a better way...
#ifdef XP_PC
#define XPCOM_DLL  "xpcom.dll"
#else
#ifdef XP_MAC
#define XPCOM_DLL "XPCOM_DLL"
#else
#define XPCOM_DLL  "libxpcom.so"
#endif
#endif

extern "C"
nsresult NS_COM XPCOMGlueStartup(const char* xpcomFile)
{
#ifdef XPCOM_GLUE_NO_DYNAMIC_LOADING
    return NS_OK;
#else
    nsresult rv;
    const char* libFile;
    if (!xpcomFile)
        libFile = XPCOM_DLL;
    else
        libFile = xpcomFile;
           
    xpcomLib = PR_LoadLibrary(libFile);
    if (!xpcomLib)
        return NS_ERROR_FAILURE;
    
    GetFrozenFunctionsFunc function = 
        (GetFrozenFunctionsFunc)PR_FindSymbol(xpcomLib, "NS_GetFrozenFunctions");
    
    if (!function) {
        PR_UnloadLibrary(xpcomLib);
        xpcomLib = nsnull;
        return NS_ERROR_FAILURE;
    }

    xpcomFunctions = (XPCOMFunctions*) calloc(1, sizeof(XPCOMFunctions));
    if (!xpcomFunctions){
        PR_UnloadLibrary(xpcomLib);
        xpcomLib = nsnull;
        return NS_ERROR_FAILURE;
    }   

    xpcomFunctions->version = XPCOM_GLUE_VERSION;
    xpcomFunctions->size    = sizeof(XPCOMFunctions);

    rv = (*function)(xpcomFunctions);
    if (NS_FAILED(rv)) {
        free(xpcomFunctions);
        xpcomFunctions = nsnull;  
        PR_UnloadLibrary(xpcomLib);
        xpcomLib = nsnull;
        return NS_ERROR_FAILURE;
    }
    return NS_OK;
#endif
}
#ifdef XPCOM_GLUE_FLUSH_HEAP
static void FlushHeap()
{

#if defined(XP_WIN32)
    // Heap compaction and shrink working set now 
#ifdef DEBUG_dougt
    PRIntervalTime start = PR_IntervalNow();
    int ret = 
#endif
        _heapmin();
#ifdef DEBUG_dougt
    printf("DEBUG: HeapCompact() %s - %d ms\n", (!ret ? "success" : "FAILED"),
           PR_IntervalToMilliseconds(PR_IntervalNow()-start));
#endif
    
    // shrink working set if we can
    // This function call is available only on winnt and above.
    typedef BOOL WINAPI SetProcessWorkingSetProc(HANDLE hProcess, SIZE_T dwMinimumWorkingSetSize,
                                                 SIZE_T dwMaximumWorkingSetSize);
    SetProcessWorkingSetProc *setProcessWorkingSetSizeP = NULL;
    
    HMODULE kernel = GetModuleHandle("kernel32.dll");
    if (kernel) {
        setProcessWorkingSetSizeP = (SetProcessWorkingSetProc *)
            GetProcAddress(kernel, "SetProcessWorkingSetSize");
    }
    
    if (setProcessWorkingSetSizeP) {
        // shrink working set
#ifdef DEBUG_dougt
        start = PR_IntervalNow();
#endif
        (*setProcessWorkingSetSizeP)(GetCurrentProcess(), -1, -1);
#ifdef DEBUG_dougt
        printf("DEBUG: Honey! I shrunk the resident-set! - %d ms\n",
               PR_IntervalToMilliseconds(PR_IntervalNow() - start));
#endif
    }
#endif 
}
#endif 

extern "C"
nsresult NS_COM XPCOMGlueShutdown()
{
#ifdef XPCOM_GLUE_NO_DYNAMIC_LOADING
    return NS_OK;
#else
    if (xpcomFunctions) {
        free ((void*)xpcomFunctions);
        xpcomFunctions = nsnull;
    }

    if (xpcomLib) {
        PR_UnloadLibrary(xpcomLib);
        xpcomLib = nsnull;
    }
#ifdef XPCOM_GLUE_FLUSH_HEAP
    // should the application do this instead of us?
    FlushHeap();
#endif 

    return NS_OK;
#endif
}

#ifndef XPCOM_GLUE_NO_DYNAMIC_LOADING
extern "C" NS_COM nsresult
NS_InitXPCOM2(nsIServiceManager* *result, 
              nsIFile* binDirectory,
              nsIDirectoryServiceProvider* appFileLocationProvider)
{
    if (!xpcomFunctions)
        return NS_ERROR_NOT_INITIALIZED;
    return xpcomFunctions->init(result, binDirectory, appFileLocationProvider);
}

extern "C" NS_COM nsresult
NS_ShutdownXPCOM(nsIServiceManager* servMgr)
{
    if (!xpcomFunctions)
        return NS_ERROR_NOT_INITIALIZED;
    return xpcomFunctions->shutdown(servMgr);
}

extern "C" NS_COM nsresult
NS_GetServiceManager(nsIServiceManager* *result)
{
    if (!xpcomFunctions)
        return NS_ERROR_NOT_INITIALIZED;
    return xpcomFunctions->getServiceManager(result);
}

extern "C" NS_COM nsresult
NS_GetComponentManager(nsIComponentManager* *result)
{
    if (!xpcomFunctions)
        return NS_ERROR_NOT_INITIALIZED;
    return xpcomFunctions->getComponentManager(result);
}

extern "C" NS_COM nsresult
NS_GetComponentRegistrar(nsIComponentRegistrar* *result)
{
    if (!xpcomFunctions)
        return NS_ERROR_NOT_INITIALIZED;
    return xpcomFunctions->getComponentRegistrar(result);
}

extern "C" NS_COM nsresult
NS_GetMemoryManager(nsIMemory* *result)
{
    if (!xpcomFunctions)
        return NS_ERROR_NOT_INITIALIZED;
    return xpcomFunctions->getMemoryManager(result);
}

extern "C" NS_COM nsresult
NS_NewLocalFile(const nsAString &path, PRBool followLinks, nsILocalFile* *result)
{
    if (!xpcomFunctions)
        return NS_ERROR_NOT_INITIALIZED;
    return xpcomFunctions->newLocalFile(path, followLinks, result);
}

extern "C" NS_COM nsresult
NS_NewNativeLocalFile(const nsACString &path, PRBool followLinks, nsILocalFile* *result)
{
    if (!xpcomFunctions)
        return NS_ERROR_NOT_INITIALIZED;
    return xpcomFunctions->newNativeLocalFile(path, followLinks, result);
}

extern "C" NS_COM nsresult
NS_RegisterXPCOMExitRoutine(XPCOMExitRoutine exitRoutine, PRUint32 priority)
{
  if (!xpcomFunctions)
      return NS_ERROR_NOT_INITIALIZED;
  return xpcomFunctions->registerExitRoutine(exitRoutine, priority);
}

extern "C" NS_COM nsresult
NS_UnregisterXPCOMExitRoutine(XPCOMExitRoutine exitRoutine)
{
    if (!xpcomFunctions)
        return NS_ERROR_NOT_INITIALIZED;
    return xpcomFunctions->unregisterExitRoutine(exitRoutine);
}
#endif // #ifndef  XPCOM_GLUE_NO_DYNAMIC_LOADING