dyldSharedLibraryLoader.cpp

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/*******************************************************************************
* Copyright (C) 2005, Vintela, Inc. All rights reserved.
* Copyright (C) 2006, Novell, Inc. All rights reserved.
* 
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* modification, are permitted provided that the following conditions are met:
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*       this list of conditions and the following disclaimer.
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*       Vintela, Inc., 
*       nor Novell, Inc., 
*       nor the names of its contributors or employees may be used to 
*       endorse or promote products derived from this software without 
*       specific prior written permission.
* 
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#include "blocxx/BLOCXX_config.h"
#if defined(BLOCXX_USE_DYLD)
#include "blocxx/dyldSharedLibraryLoader.hpp"
#include "blocxx/dyldSharedLibrary.hpp"
#include "blocxx/Format.hpp"

namespace BLOCXX_NAMESPACE
{

namespace
{
   String COMPONENT_NAME("blocxx.dyldSharedLibraryLoader");
}

std::ostream& operator<<(std::ostream& o, NSObjectFileImageReturnCode code)
{
#define SIMPLE_NSOBJ_CASE(X) case X: o << ""#X
   switch (code)
   {
      SIMPLE_NSOBJ_CASE(NSObjectFileImageFailure);
      break;
      SIMPLE_NSOBJ_CASE(NSObjectFileImageSuccess);
      break;
      SIMPLE_NSOBJ_CASE(NSObjectFileImageInappropriateFile);
      break;
      SIMPLE_NSOBJ_CASE(NSObjectFileImageArch);
      break;
      SIMPLE_NSOBJ_CASE(NSObjectFileImageFormat);
      break;
      SIMPLE_NSOBJ_CASE(NSObjectFileImageAccess);
      break;
   }
#undef SIMPLE_NSOBJ_CASE
   return o;
}

SharedLibraryRef
dyldSharedLibraryLoader::loadSharedLibrary(const String& filename) const
{
   Logger logger(COMPONENT_NAME);
   BLOCXX_LOG_DEBUG2(logger, Format("Load request for %1 received.", filename));
   NSObjectFileImage image = 0;
   NSObjectFileImageReturnCode dsoerr = NSCreateObjectFileImageFromFile(filename.c_str(), &image);
   const char* err_msg = NULL;
   NSModule libhandle = NULL; 

   if (dsoerr == NSObjectFileImageSuccess)
   {
      libhandle = NSLinkModule(image, filename.c_str(), NSLINKMODULE_OPTION_RETURN_ON_ERROR | NSLINKMODULE_OPTION_PRIVATE);      
      if (!libhandle)
      {
         NSLinkEditErrors errors;
         int errorNumber;
         const char *fileName;
         NSLinkEditError(&errors, &errorNumber, &fileName, &err_msg);
      }
      NSDestroyObjectFileImage(image);
   }
   else
   {
      err_msg = "cannot create object file image";
      BLOCXX_LOG_ERROR(logger, Format("NSCreateObject: %1 failed with error %2",
                                          filename, dsoerr));
   }



   if (libhandle)
   {
      try
      {
         return SharedLibraryRef( new dyldSharedLibrary(libhandle,
                                                                               filename));
      }
      catch (...)
      {
         NSUnLinkModule(libhandle, FALSE);
         throw;
      }
   }
   else
   {
      BLOCXX_LOG_ERROR(logger, Format("dyldSharedLibraryLoader::loadSharedLibrary:"
                                          " %1", err_msg));
      return SharedLibraryRef( 0 );
   }
}
SharedLibraryLoaderRef
SharedLibraryLoader::createSharedLibraryLoader()
{
   return SharedLibraryLoaderRef(new dyldSharedLibraryLoader);
}
dyldSharedLibraryLoader::~dyldSharedLibraryLoader()
{
}

} // end namespace BLOCXX_NAMESPACE

#endif // #if defined(BLOCXX_USE_DYLD)