src/common/dynlib.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dynlib.cpp
   3 // Purpose:     Dynamic library management
   4 // Author:      Guilhem Lavaux
   5 // Modified by:
   6 // Created:     20/07/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Guilhem Lavaux
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21 #   pragma implementation "dynlib.h"
  22 #endif
  23
  24 #include  "wx/wxprec.h"
  25
  26 #ifdef __BORLANDC__
  27   #pragma hdrstop
  28 #endif
  29
  30 #if wxUSE_DYNLIB_CLASS
  31
  32 #if defined(__WINDOWS__)
  33     #include "wx/msw/private.h"
  34 #endif
  35
  36 #include "wx/dynlib.h"
  37 #include "wx/filefn.h"
  38 #include "wx/intl.h"
  39 #include "wx/log.h"
  40 #include "wx/tokenzr.h"
  41
  42 // ----------------------------------------------------------------------------
  43 // conditional compilation
  44 // ----------------------------------------------------------------------------
  45
  46 #if defined(__WXPM__) || defined(__EMX__)
  47 #  define INCL_DOS
  48 #  include <os2.h>
  49 #  define wxDllOpen(error, lib, handle)     DosLoadModule(error, sizeof(error), lib, &handle)
  50 #  define wxDllGetSymbol(handle, modaddr)   DosQueryProcAddr(handle, 1L, NULL, (PFN*)modaddr)
  51 #  define wxDllClose(handle)                DosFreeModule(handle)
  52 #elif defined(HAVE_DLOPEN)
  53     // note about dlopen() flags: we use RTLD_NOW to have more Windows-like
  54     // behaviour (Win won't let you load a library with missing symbols) and
  55     // RTLD_GLOBAL because it is needed sometimes and probably doesn't hurt
  56     // otherwise. On True64-Unix RTLD_GLOBAL is not allowed and on VMS the
  57     // second argument on dlopen is ignored.
  58 #ifdef __VMS
  59 # define wxDllOpen(lib)                dlopen(lib.fn_str(), 0 )
  60 #elif defined( __osf__ )
  61 # define wxDllOpen(lib)                dlopen(lib.fn_str(), RTLD_LAZY )
  62 #else
  63 # define wxDllOpen(lib)                dlopen(lib.fn_str(), RTLD_LAZY | RTLD_GLOBAL)
  64 #endif
  65 #define wxDllGetSymbol(handle, name)  dlsym(handle, name)
  66 #   define wxDllClose                    dlclose
  67 #elif defined(HAVE_SHL_LOAD)
  68 #   define wxDllOpen(lib)                shl_load(lib.fn_str(), BIND_DEFERRED, 0)
  69 #   define wxDllClose                    shl_unload
  70
  71     static inline void *wxDllGetSymbol(shl_t handle, const wxString& name)
  72     {
  73         void *sym;
  74         if ( shl_findsym(&handle, name.mb_str(), TYPE_UNDEFINED, &sym) == 0 )
  75             return sym;
  76         else
  77             return (void *)0;
  78     }
  79 #elif defined(__APPLE__) && defined(__UNIX__)
  80 char *dlopen(char *path, int mode /* mode is ignored */);
  81 void *dlsym(void *handle, char *symbol);
  82 int   dlclose(void *handle);
  83 char *dlerror();
  84
  85 #   define wxDllOpen(lib)                dlopen(lib.fn_str(), 0)
  86 #   define wxDllGetSymbol(handle, name)  dlsym(handle, name)
  87 #   define wxDllClose                    dlclose
  88 #elif defined(__WINDOWS__)
  89     // using LoadLibraryEx under Win32 to avoid name clash with LoadLibrary
  90 #   ifdef __WIN32__
  91 #ifdef _UNICODE
  92 #      define wxDllOpen(lib)                  ::LoadLibraryExW(lib, 0, 0)
  93 #else
  94 #      define wxDllOpen(lib)                  ::LoadLibraryExA(lib, 0, 0)
  95 #endif
  96 #   else   // Win16
  97 #      define wxDllOpen(lib)                  ::LoadLibrary(lib)
  98 #   endif  // Win32/16
  99 #   define wxDllGetSymbol(handle, name)    ::GetProcAddress(handle, name)
 100 #   define wxDllClose                      ::FreeLibrary
 101 #else
 102 #   error "Don't know how to load shared libraries on this platform."
 103 #endif // OS
 104
 105 // ---------------------------------------------------------------------------
 106 // Global variables
 107 // ---------------------------------------------------------------------------
 108
 109 wxLibraries wxTheLibraries;
 110
 111 // ============================================================================
 112 // implementation
 113 // ============================================================================
 114
 115 // construct the full name from the base shared object name: adds a .dll
 116 // suffix under Windows or .so under Unix
 117 static wxString ConstructLibraryName(const wxString& basename)
 118 {
 119     wxString fullname;
 120     fullname << basename << wxDllLoader::GetDllExt();
 121
 122     return fullname;
 123 }
 124
 125 // ---------------------------------------------------------------------------
 126 // wxLibrary (one instance per dynamic library)
 127 // ---------------------------------------------------------------------------
 128
 129 wxLibrary::wxLibrary(wxDllType handle)
 130 {
 131     typedef wxClassInfo *(*t_get_first)(void);
 132     t_get_first get_first;
 133
 134     m_handle = handle;
 135
 136     // Some system may use a local heap for library.
 137     get_first = (t_get_first)GetSymbol("wxGetClassFirst");
 138     // It is a wxWindows DLL.
 139     if (get_first)
 140         PrepareClasses(get_first());
 141 }
 142
 143 wxLibrary::~wxLibrary()
 144 {
 145     if ( m_handle )
 146     {
 147         wxDllClose(m_handle);
 148     }
 149 }
 150
 151 wxObject *wxLibrary::CreateObject(const wxString& name)
 152 {
 153     wxClassInfo *info = (wxClassInfo *)classTable.Get(name);
 154
 155     if (!info)
 156         return NULL;
 157
 158     return info->CreateObject();
 159 }
 160
 161 void wxLibrary::PrepareClasses(wxClassInfo *first)
 162 {
 163     // Index all class infos by their class name
 164     wxClassInfo *info = first;
 165     while (info)
 166     {
 167         if (info->m_className)
 168             classTable.Put(info->m_className, (wxObject *)info);
 169         info = info->GetNext();
 170     }
 171
 172     // Set base pointers for each wxClassInfo
 173     info = first;
 174     while (info)
 175     {
 176         if (info->GetBaseClassName1())
 177             info->m_baseInfo1 = (wxClassInfo *)classTable.Get(info->GetBaseClassName1());
 178         if (info->GetBaseClassName2())
 179             info->m_baseInfo2 = (wxClassInfo *)classTable.Get(info->GetBaseClassName2());
 180         info = info->m_next;
 181     }
 182 }
 183
 184 void *wxLibrary::GetSymbol(const wxString& symbname)
 185 {
 186    return wxDllLoader::GetSymbol(m_handle, symbname);
 187 }
 188
 189 // ---------------------------------------------------------------------------
 190 // wxDllLoader
 191 // ---------------------------------------------------------------------------
 192
 193 /* static */
 194 wxString wxDllLoader::GetDllExt()
 195 {
 196     wxString ext;
 197
 198 #if defined(__WINDOWS__) || defined(__WXPM__) || defined(__EMX__)
 199     ext = _T(".dll");
 200 #elif defined(__UNIX__)
 201 #   if defined(__HPUX__)
 202         ext = _T(".sl");
 203 #   else //__HPUX__
 204         ext = _T(".so");
 205 #   endif //__HPUX__
 206 #endif
 207
 208     return ext;
 209 }
 210
 211 /* static */
 212 wxDllType
 213 wxDllLoader::GetProgramHandle(void)
 214 {
 215 #if defined( HAVE_DLOPEN ) && !defined(__EMX__)
 216    // optain handle for main program
 217    return dlopen(NULL, RTLD_NOW/*RTLD_LAZY*/);
 218 #elif defined (HAVE_SHL_LOAD)
 219    // shl_findsymbol with NULL handle looks up in main program
 220    return 0;
 221 #else
 222    wxFAIL_MSG( wxT("This method is not implemented under Windows or OS/2"));
 223    return 0;
 224 #endif
 225 }
 226
 227 /* static */
 228 wxDllType
 229 wxDllLoader::LoadLibrary(const wxString & libname, bool *success)
 230 {
 231     wxDllType handle;
 232
 233 #if defined(__WXMAC__) && !defined(__UNIX__)
 234     FSSpec myFSSpec ;
 235     Ptr myMainAddr ;
 236     Str255 myErrName ;
 237
 238     wxMacPathToFSSpec( libname , &myFSSpec ) ;
 239     if (GetDiskFragment( &myFSSpec , 0 , kCFragGoesToEOF , "\p" , kPrivateCFragCopy , &handle , &myMainAddr ,
 240                 myErrName ) != noErr )
 241     {
 242         p2cstr( myErrName ) ;
 243         wxASSERT_MSG( 1 , (char*)myErrName ) ;
 244         return NULL ;
 245     }
 246 #elif defined(__WXPM__) || defined(__EMX__)
 247     char zError[256] = "";
 248     wxDllOpen(zError, libname, handle);
 249 #else // !Mac
 250     handle = wxDllOpen(libname);
 251 #endif // OS
 252
 253     if ( !handle )
 254     {
 255         wxString msg(_("Failed to load shared library '%s'"));
 256
 257 #ifdef HAVE_DLERROR
 258         const char *errmsg = dlerror();
 259         if ( errmsg )
 260         {
 261             // the error string format is "libname: ...", but we already have
 262             // libname, so cut it off
 263             const char *p = strchr(errmsg, ':');
 264             if ( p )
 265             {
 266                 if ( *++p == ' ' )
 267                     p++;
 268             }
 269             else
 270             {
 271                 p = errmsg;
 272             }
 273
 274             msg += _T(" (%s)");
 275             wxLogError(msg, libname.c_str(), p);
 276         }
 277         else
 278 #endif // HAVE_DLERROR
 279         {
 280             wxLogSysError(msg, libname.c_str());
 281         }
 282     }
 283
 284     if ( success )
 285     {
 286         *success = handle != 0;
 287     }
 288
 289     return handle;
 290 }
 291
 292
 293 /* static */
 294 void
 295 wxDllLoader::UnloadLibrary(wxDllType handle)
 296 {
 297    wxDllClose(handle);
 298 }
 299
 300 /* static */
 301 void *
 302 wxDllLoader::GetSymbol(wxDllType dllHandle, const wxString &name)
 303 {
 304     void *symbol = NULL;    // return value
 305
 306 #if defined(__WXMAC__) && !defined(__UNIX__)
 307     Ptr symAddress ;
 308     CFragSymbolClass symClass ;
 309     Str255 symName ;
 310
 311 #if TARGET_CARBON
 312     c2pstrcpy( (StringPtr) symName , name ) ;
 313 #else
 314     strcpy( (char *) symName , name ) ;
 315         c2pstr( (char *) symName ) ;
 316 #endif
 317
 318     if ( FindSymbol( dllHandle , symName , &symAddress , &symClass ) == noErr )
 319         symbol = (void *)symAddress ;
 320 #elif defined( __WXPM__ ) || defined(__EMX__)
 321     wxDllGetSymbol(dllHandle, symbol);
 322 #else
 323     // mb_str() is necessary in Unicode build
 324     symbol = wxDllGetSymbol(dllHandle, name.mb_str());
 325 #endif
 326
 327     if ( !symbol )
 328     {
 329         wxLogSysError(_("Couldn't find symbol '%s' in a dynamic library"),
 330                       name.c_str());
 331     }
 332     return symbol;
 333 }
 334
 335 // ---------------------------------------------------------------------------
 336 // wxLibraries (only one instance should normally exist)
 337 // ---------------------------------------------------------------------------
 338
 339 wxLibraries::wxLibraries():m_loaded(wxKEY_STRING)
 340 {
 341 }
 342
 343 wxLibraries::~wxLibraries()
 344 {
 345     wxNode *node = m_loaded.First();
 346
 347     while (node) {
 348         wxLibrary *lib = (wxLibrary *)node->Data();
 349         delete lib;
 350
 351         node = node->Next();
 352     }
 353 }
 354
 355 wxLibrary *wxLibraries::LoadLibrary(const wxString& name)
 356 {
 357     wxNode *node;
 358     wxLibrary *lib;
 359     wxClassInfo *old_sm_first;
 360
 361 #if defined(__VISAGECPP__)
 362     node = m_loaded.Find(name.GetData());
 363     if (node != NULL)
 364         return ((wxLibrary *)node->Data());
 365 #else // !OS/2
 366     if ( (node = m_loaded.Find(name.GetData())) )
 367         return ((wxLibrary *)node->Data());
 368 #endif
 369     // If DLL shares data, this is necessary.
 370     old_sm_first = wxClassInfo::sm_first;
 371     wxClassInfo::sm_first = NULL;
 372
 373     wxString libname = ConstructLibraryName(name);
 374
 375 /*
 376   Unix automatically builds that library name, at least for dlopen()
 377 */
 378 #if 0
 379 #if defined(__UNIX__)
 380     // found the first file in LD_LIBRARY_PATH with this name
 381     wxString libPath("/lib:/usr/lib"); // system path first
 382     const char *envLibPath = getenv("LD_LIBRARY_PATH");
 383     if ( envLibPath )
 384         libPath << wxT(':') << envLibPath;
 385     wxStringTokenizer tokenizer(libPath, wxT(':'));
 386     while ( tokenizer.HasMoreToken() )
 387     {
 388         wxString fullname(tokenizer.NextToken());
 389
 390         fullname << wxT('/') << libname;
 391         if ( wxFileExists(fullname) )
 392         {
 393             libname = fullname;
 394
 395             // found the library
 396             break;
 397         }
 398     }
 399     //else: not found in the path, leave the name as is (secutiry risk?)
 400
 401 #endif // __UNIX__
 402 #endif
 403
 404     bool success = FALSE;
 405     wxDllType handle = wxDllLoader::LoadLibrary(libname, &success);
 406     if(success)
 407     {
 408        lib = new wxLibrary(handle);
 409        wxClassInfo::sm_first = old_sm_first;
 410        m_loaded.Append(name.GetData(), lib);
 411     }
 412     else
 413        lib = NULL;
 414     return lib;
 415 }
 416
 417 wxObject *wxLibraries::CreateObject(const wxString& path)
 418 {
 419     wxNode *node = m_loaded.First();
 420     wxObject *obj;
 421
 422     while (node) {
 423         obj = ((wxLibrary *)node->Data())->CreateObject(path);
 424         if (obj)
 425             return obj;
 426
 427         node = node->Next();
 428     }
 429     return NULL;
 430 }
 431
 432 #endif // wxUSE_DYNLIB_CLASS