CMake/Source/kwsys/DynamicLoader.cxx

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/*=========================================================================
Program: KWSys - Kitware System Library
Module: $RCSfile$
Copyright (c) Kitware, Inc., Insight Consortium. All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#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 "DynamicLoader.hxx.in"
# include "Configure.hxx.in"
#endif
// This file is actually 3 different implementations.
// 1. HP machines which uses shl_load
// 2. Mac OS X 10.2.x and earlier which uses NSLinkModule
// 3. Windows which uses LoadLibrary
// 4. Most unix systems (including Mac OS X 10.3 and later) which use dlopen
// (default) Each part of the ifdef contains a complete implementation for
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// the static methods of DynamicLoader.
namespace KWSYS_NAMESPACE
{
//----------------------------------------------------------------------------
DynamicLoader::DynamicLoader()
{
}
//----------------------------------------------------------------------------
DynamicLoader::~DynamicLoader()
{
}
}
// ---------------------------------------------------------------
// 1. Implementation for HPUX machines
#ifdef __hpux
#include <errno.h>
#include <dl.h>
#define DYNAMICLOADER_DEFINED 1
namespace KWSYS_NAMESPACE
{
//----------------------------------------------------------------------------
DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(const char* libname )
{
return shl_load(libname, BIND_DEFERRED | DYNAMIC_PATH, 0L);
}
//----------------------------------------------------------------------------
int DynamicLoader::CloseLibrary(DynamicLoader::LibraryHandle lib)
{
return !shl_unload(lib);
}
//----------------------------------------------------------------------------
DynamicLoader::SymbolPointer
DynamicLoader::GetSymbolAddress(DynamicLoader::LibraryHandle lib, const char* 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, 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::LibPrefix()
{
return "lib";
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LibExtension()
{
return ".sl";
}
//----------------------------------------------------------------------------
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.
*/
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if( errno == ENOEXEC
|| errno == ENOSYM
|| errno == EINVAL )
{
return strerror(errno);
}
// else
return 0;
}
} // namespace KWSYS_NAMESPACE
#endif //__hpux
// ---------------------------------------------------------------
// 2. Implementation for Mac OS X 10.2.x and earlier
#ifdef __APPLE__
#if MAC_OS_X_VERSION_MAX_ALLOWED < 1030
#include <string.h> // for strlen
#include <mach-o/dyld.h>
#define DYNAMICLOADER_DEFINED 1
namespace KWSYS_NAMESPACE
{
//----------------------------------------------------------------------------
DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(const char* libname )
{
NSObjectFileImageReturnCode rc;
NSObjectFileImage image = 0;
rc = NSCreateObjectFileImageFromFile(libname, &image);
// rc == NSObjectFileImageInappropriateFile when trying to load a dylib file
if( rc != NSObjectFileImageSuccess )
{
return 0;
}
NSModule handle = NSLinkModule(image, libname,
NSLINKMODULE_OPTION_BINDNOW|NSLINKMODULE_OPTION_RETURN_ON_ERROR);
NSDestroyObjectFileImage(image);
return handle;
}
//----------------------------------------------------------------------------
int DynamicLoader::CloseLibrary( DynamicLoader::LibraryHandle lib)
{
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// 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 char* sym)
{
void *result=0;
// Need to prepend symbols with '_' on Apple-gcc compilers
size_t len = strlen(sym);
char *rsym = new char[len + 1 + 1];
strcpy(rsym, "_");
strcat(rsym+1, sym);
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::LibPrefix()
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{
return "lib";
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LibExtension()
{
// NSCreateObjectFileImageFromFile fail when dealing with dylib image
// it returns NSObjectFileImageInappropriateFile
//return ".dylib";
return ".so";
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LastError()
{
return 0;
}
} // namespace KWSYS_NAMESPACE
#endif // MAC_OS_X_VERSION_MAX_ALLOWED < 1030
#endif // __APPLE__
// ---------------------------------------------------------------
// 3. Implementation for Windows win32 code but not cygwin
#if defined(_WIN32) && !defined(__CYGWIN__)
#include <windows.h>
#define DYNAMICLOADER_DEFINED 1
namespace KWSYS_NAMESPACE
{
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//----------------------------------------------------------------------------
DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(const char* libname)
{
DynamicLoader::LibraryHandle lh;
#ifdef UNICODE
wchar_t libn[MB_CUR_MAX];
mbstowcs(libn, libname, MB_CUR_MAX);
lh = LoadLibrary(libn);
#else
lh = LoadLibrary(libname);
#endif
return lh;
}
//----------------------------------------------------------------------------
int DynamicLoader::CloseLibrary(DynamicLoader::LibraryHandle lib)
{
return (int)FreeLibrary(lib);
}
//----------------------------------------------------------------------------
DynamicLoader::SymbolPointer DynamicLoader::GetSymbolAddress(
DynamicLoader::LibraryHandle lib, const char* sym)
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{
// 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 = strlen(sym);
char *rsym = new char[len + 1 + 1];
strcpy(rsym, "_");
strcat(rsym, sym);
#else
const char *rsym = sym;
#endif
#ifdef UNICODE
wchar_t wsym[MB_CUR_MAX];
mbstowcs(wsym, rsym, MB_CUR_MAX);
result = GetProcAddress(lib, wsym);
#else
result = (void*)GetProcAddress(lib, rsym);
#endif
#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::LibPrefix()
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{
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#ifdef __MINGW32__
return "lib";
#else
return "";
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#endif
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LibExtension()
{
return ".dll";
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LastError()
{
LPVOID lpMsgBuf;
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FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
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NULL
);
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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
#endif //_WIN32
// ---------------------------------------------------------------
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// 4. Implementation for BeOS
#ifdef __BEOS__
#include <string.h> // for strerror()
#include <be/kernel/image.h>
#include <be/support/Errors.h>
#define DYNAMICLOADER_DEFINED 1
namespace KWSYS_NAMESPACE
{
static image_id last_dynamic_err = B_OK;
//----------------------------------------------------------------------------
DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(const char* 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);
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 char* 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,B_SYMBOL_TYPE_ANY,&result.pvoid);
if (rc != B_OK)
{
last_dynamic_err = rc;
result.psym = NULL;
}
}
return result.psym;
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LibPrefix()
{
return "lib";
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LibExtension()
{
return ".so";
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LastError()
{
const char *retval = strerror(last_dynamic_err);
last_dynamic_err = B_OK;
return retval;
}
} // namespace KWSYS_NAMESPACE
#endif
// ---------------------------------------------------------------
// 5. Implementation for default UNIX machines.
// if nothing has been defined then use this
#ifndef DYNAMICLOADER_DEFINED
#define DYNAMICLOADER_DEFINED 1
// Setup for most unix machines
#include <dlfcn.h>
namespace KWSYS_NAMESPACE
{
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//----------------------------------------------------------------------------
DynamicLoader::LibraryHandle DynamicLoader::OpenLibrary(const char* libname )
{
return dlopen(libname, 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 char* sym)
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{
// Hack to cast pointer-to-data to pointer-to-function.
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union
{
void* pvoid;
DynamicLoader::SymbolPointer psym;
} result;
result.pvoid = dlsym(lib, sym);
return result.psym;
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LibPrefix()
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{
return "lib";
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LibExtension()
{
#ifdef __CYGWIN__
return ".dll";
#else
return ".so";
#endif
}
//----------------------------------------------------------------------------
const char* DynamicLoader::LastError()
{
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return dlerror();
}
} // namespace KWSYS_NAMESPACE
#endif