summaryrefslogtreecommitdiffstats
path: root/Source/kwsys/DynamicLoader.cxx
blob: 1b4596a4efbdbbad9814c6a6da80667591bdd24e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file Copyright.txt or https://cmake.org/licensing#kwsys for details.  */
#include "kwsysPrivate.h"
#include KWSYS_HEADER(DynamicLoader.hxx)

#include KWSYS_HEADER(Configure.hxx)

// Work-around CMake dependency scanning limitation.  This must
// duplicate the above list of headers.
#if 0
#include "Configure.hxx.in"
#include "DynamicLoader.hxx.in"
#endif

// This file actually contains several different implementations:
// * NOOP for environments without dynamic libs
// * HP machines which uses shl_load
// * Mac OS X 10.2.x and earlier which uses NSLinkModule
// * Windows which uses LoadLibrary
// * BeOS / Haiku
// * FreeMiNT for Atari
// * Default implementation for *NIX systems (including Mac OS X 10.3 and
//   later) which use dlopen
//
// Each part of the ifdef contains a complete implementation for
// the static methods of DynamicLoader.

#if !KWSYS_SUPPORTS_SHARED_LIBS
// Implementation for environments without dynamic libs
#include <string.h> // for strerror()

namespace KWSYS_NAMESPACE {

DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(
  const std::string& libname)
{
  return 0;
}

int DynamicLoader::CloseLibrary(DynamicLoader::LibraryHandle lib)
{
  if (!lib) {
    return 0;
  }

  return 1;
}

DynamicLoader::SymbolPointer DynamicLoader::GetSymbolAddress(
  DynamicLoader::LibraryHandle lib, const std::string& sym)
{
  return 0;
}

const char* DynamicLoader::LastError()
{
  return "General error";
}

} // namespace KWSYS_NAMESPACE

#elif defined(__hpux)
// Implementation for HPUX  machines
#include <dl.h>
#include <errno.h>

namespace KWSYS_NAMESPACE {

DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(
  const std::string& libname)
{
  return shl_load(libname.c_str(), BIND_DEFERRED | DYNAMIC_PATH, 0L);
}

int DynamicLoader::CloseLibrary(DynamicLoader::LibraryHandle lib)
{
  if (!lib) {
    return 0;
  }
  return !shl_unload(lib);
}

DynamicLoader::SymbolPointer DynamicLoader::GetSymbolAddress(
  DynamicLoader::LibraryHandle lib, const std::string& sym)
{
  void* addr;
  int status;

  /* TYPE_PROCEDURE Look for a function or procedure. (This used to be default)
   * TYPE_DATA      Look for a symbol in the data segment (for example,
   * variables).
   * TYPE_UNDEFINED Look for any symbol.
   */
  status = shl_findsym(&lib, sym.c_str(), TYPE_UNDEFINED, &addr);
  void* result = (status < 0) ? (void*)0 : addr;

  // Hack to cast pointer-to-data to pointer-to-function.
  return *reinterpret_cast<DynamicLoader::SymbolPointer*>(&result);
}

const char* DynamicLoader::LastError()
{
  // TODO: Need implementation with errno/strerror
  /* If successful, shl_findsym returns an integer (int) value zero. If
   * shl_findsym cannot find sym, it returns -1 and sets errno to zero.
   * If any other errors occur, shl_findsym returns -1 and sets errno to one
   * of these values (defined in <errno.h>):
   * ENOEXEC
   * A format error was detected in the specified library.
   * ENOSYM
   * A symbol on which sym depends could not be found.
   * EINVAL
   * The specified handle is invalid.
   */

  if (errno == ENOEXEC || errno == ENOSYM || errno == EINVAL) {
    return strerror(errno);
  }
  // else
  return 0;
}

} // namespace KWSYS_NAMESPACE

#elif defined(__APPLE__) && (MAC_OS_X_VERSION_MAX_ALLOWED < 1030)
// Implementation for Mac OS X 10.2.x and earlier
#include <mach-o/dyld.h>
#include <string.h> // for strlen

namespace KWSYS_NAMESPACE {

DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(
  const std::string& libname)
{
  NSObjectFileImageReturnCode rc;
  NSObjectFileImage image = 0;

  rc = NSCreateObjectFileImageFromFile(libname.c_str(), &image);
  // rc == NSObjectFileImageInappropriateFile when trying to load a dylib file
  if (rc != NSObjectFileImageSuccess) {
    return 0;
  }
  NSModule handle =
    NSLinkModule(image, libname.c_str(), NSLINKMODULE_OPTION_BINDNOW |
                   NSLINKMODULE_OPTION_RETURN_ON_ERROR);
  NSDestroyObjectFileImage(image);
  return handle;
}

int DynamicLoader::CloseLibrary(DynamicLoader::LibraryHandle lib)
{
  // NSUNLINKMODULE_OPTION_KEEP_MEMORY_MAPPED
  // With  this  option  the memory for the module is not deallocated
  // allowing pointers into the module to still be valid.
  // You should use this option instead if your code experience some problems
  // reported against Panther 10.3.9 (fixed in Tiger 10.4.2 and up)
  bool success = NSUnLinkModule(lib, NSUNLINKMODULE_OPTION_NONE);
  return success;
}

DynamicLoader::SymbolPointer DynamicLoader::GetSymbolAddress(
  DynamicLoader::LibraryHandle lib, const std::string& sym)
{
  void* result = 0;
  // Need to prepend symbols with '_' on Apple-gcc compilers
  size_t len = sym.size();
  char* rsym = new char[len + 1 + 1];
  strcpy(rsym, "_");
  strcat(rsym + 1, sym.c_str());

  NSSymbol symbol = NSLookupSymbolInModule(lib, rsym);
  if (symbol) {
    result = NSAddressOfSymbol(symbol);
  }

  delete[] rsym;
  // Hack to cast pointer-to-data to pointer-to-function.
  return *reinterpret_cast<DynamicLoader::SymbolPointer*>(&result);
}

const char* DynamicLoader::LastError()
{
  return 0;
}

} // namespace KWSYS_NAMESPACE

#elif defined(_WIN32) && !defined(__CYGWIN__)
// Implementation for Windows win32 code but not cygwin
#include <windows.h>

namespace KWSYS_NAMESPACE {

DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(
  const std::string& libname)
{
  DynamicLoader::LibraryHandle lh;
  int length = MultiByteToWideChar(CP_UTF8, 0, libname.c_str(), -1, NULL, 0);
  wchar_t* wchars = new wchar_t[length + 1];
  wchars[0] = '\0';
  MultiByteToWideChar(CP_UTF8, 0, libname.c_str(), -1, wchars, length);
  lh = LoadLibraryW(wchars);
  delete[] wchars;
  return lh;
}

int DynamicLoader::CloseLibrary(DynamicLoader::LibraryHandle lib)
{
  return (int)FreeLibrary(lib);
}

DynamicLoader::SymbolPointer DynamicLoader::GetSymbolAddress(
  DynamicLoader::LibraryHandle lib, const std::string& sym)
{
  // TODO: The calling convention affects the name of the symbol.  We
  // should have a tool to help get the symbol with the desired
  // calling convention.  Currently we assume cdecl.
  //
  // Borland:
  //   __cdecl    = "_func" (default)
  //   __fastcall = "@_func"
  //   __stdcall  = "func"
  //
  // Watcom:
  //   __cdecl    = "_func"
  //   __fastcall = "@_func@X"
  //   __stdcall  = "_func@X"
  //   __watcall  = "func_" (default)
  //
  // MSVC:
  //   __cdecl    = "func" (default)
  //   __fastcall = "@_func@X"
  //   __stdcall  = "_func@X"
  //
  // Note that the "@X" part of the name above is the total size (in
  // bytes) of the arguments on the stack.
  void* result;
#if defined(__BORLANDC__) || defined(__WATCOMC__)
  // Need to prepend symbols with '_'
  size_t len = sym.size();
  char* rsym = new char[len + 1 + 1];
  strcpy(rsym, "_");
  strcat(rsym, sym.c_str());
#else
  const char* rsym = sym.c_str();
#endif
  result = (void*)GetProcAddress(lib, rsym);
#if defined(__BORLANDC__) || defined(__WATCOMC__)
  delete[] rsym;
#endif
// Hack to cast pointer-to-data to pointer-to-function.
#ifdef __WATCOMC__
  return *(DynamicLoader::SymbolPointer*)(&result);
#else
  return *reinterpret_cast<DynamicLoader::SymbolPointer*>(&result);
#endif
}

const char* DynamicLoader::LastError()
{
  LPVOID lpMsgBuf = NULL;

  FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
                NULL, GetLastError(),
                MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
                (LPTSTR)&lpMsgBuf, 0, NULL);

  if (!lpMsgBuf) {
    return NULL;
  }

  static char* str = 0;
  delete[] str;
  str = strcpy(new char[strlen((char*)lpMsgBuf) + 1], (char*)lpMsgBuf);
  // Free the buffer.
  LocalFree(lpMsgBuf);
  return str;
}

} // namespace KWSYS_NAMESPACE

#elif defined(__BEOS__)
// Implementation for BeOS / Haiku
#include <string.h> // for strerror()

#include <be/kernel/image.h>
#include <be/support/Errors.h>

namespace KWSYS_NAMESPACE {

static image_id last_dynamic_err = B_OK;

DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(
  const std::string& libname)
{
  // image_id's are integers, errors are negative. Add one just in case we
  //  get a valid image_id of zero (is that even possible?).
  image_id rc = load_add_on(libname.c_str());
  if (rc < 0) {
    last_dynamic_err = rc;
    return 0;
  }

  return rc + 1;
}

int DynamicLoader::CloseLibrary(DynamicLoader::LibraryHandle lib)
{
  if (!lib) {
    last_dynamic_err = B_BAD_VALUE;
    return 0;
  } else {
    // The function dlclose() returns 0 on success, and non-zero on error.
    status_t rc = unload_add_on(lib - 1);
    if (rc != B_OK) {
      last_dynamic_err = rc;
      return 0;
    }
  }

  return 1;
}

DynamicLoader::SymbolPointer DynamicLoader::GetSymbolAddress(
  DynamicLoader::LibraryHandle lib, const std::string& sym)
{
  // Hack to cast pointer-to-data to pointer-to-function.
  union
  {
    void* pvoid;
    DynamicLoader::SymbolPointer psym;
  } result;

  result.psym = NULL;

  if (!lib) {
    last_dynamic_err = B_BAD_VALUE;
  } else {
    // !!! FIXME: BeOS can do function-only lookups...does this ever
    // !!! FIXME:  actually _want_ a data symbol lookup, or was this union
    // !!! FIXME:  a leftover of dlsym()? (s/ANY/TEXT for functions only).
    status_t rc =
      get_image_symbol(lib - 1, sym.c_str(), B_SYMBOL_TYPE_ANY, &result.pvoid);
    if (rc != B_OK) {
      last_dynamic_err = rc;
      result.psym = NULL;
    }
  }
  return result.psym;
}

const char* DynamicLoader::LastError()
{
  const char* retval = strerror(last_dynamic_err);
  last_dynamic_err = B_OK;
  return retval;
}

} // namespace KWSYS_NAMESPACE

#elif defined(__MINT__)
// Implementation for FreeMiNT on Atari
#define _GNU_SOURCE /* for program_invocation_name */
#include <dld.h>
#include <errno.h>
#include <malloc.h>
#include <string.h>

namespace KWSYS_NAMESPACE {

DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(
  const std::string& libname)
{
  char* name = (char*)calloc(1, libname.size() + 1);
  dld_init(program_invocation_name);
  strncpy(name, libname.c_str(), libname.size());
  dld_link(libname.c_str());
  return (void*)name;
}

int DynamicLoader::CloseLibrary(DynamicLoader::LibraryHandle lib)
{
  dld_unlink_by_file((char*)lib, 0);
  free(lib);
  return 0;
}

DynamicLoader::SymbolPointer DynamicLoader::GetSymbolAddress(
  DynamicLoader::LibraryHandle lib, const std::string& sym)
{
  // Hack to cast pointer-to-data to pointer-to-function.
  union
  {
    void* pvoid;
    DynamicLoader::SymbolPointer psym;
  } result;
  result.pvoid = dld_get_symbol(sym.c_str());
  return result.psym;
}

const char* DynamicLoader::LastError()
{
  return dld_strerror(dld_errno);
}

} // namespace KWSYS_NAMESPACE

#else
// Default implementation for *NIX systems (including Mac OS X 10.3 and
// later) which use dlopen
#include <dlfcn.h>

namespace KWSYS_NAMESPACE {

DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(
  const std::string& libname)
{
  return dlopen(libname.c_str(), RTLD_LAZY);
}

int DynamicLoader::CloseLibrary(DynamicLoader::LibraryHandle lib)
{
  if (lib) {
    // The function dlclose() returns 0 on success, and non-zero on error.
    return !dlclose(lib);
  }
  // else
  return 0;
}

DynamicLoader::SymbolPointer DynamicLoader::GetSymbolAddress(
  DynamicLoader::LibraryHandle lib, const std::string& sym)
{
  // Hack to cast pointer-to-data to pointer-to-function.
  union
  {
    void* pvoid;
    DynamicLoader::SymbolPointer psym;
  } result;
  result.pvoid = dlsym(lib, sym.c_str());
  return result.psym;
}

const char* DynamicLoader::LastError()
{
  return dlerror();
}

} // namespace KWSYS_NAMESPACE
#endif