CMake/Source/cmDynamicLoader.cxx

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/*=========================================================================
Program: CMake - Cross-Platform Makefile Generator
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Module: $RCSfile$
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) 2002 Kitware, Inc., Insight Consortium. All rights reserved.
See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
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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 "cmDynamicLoader.h"
// This file is actually several different implementations.
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// 1. HP machines which uses shl_load
// 2. Apple OSX which uses NSLinkModule
// 3. Windows which uses LoadLibrary
// 4. Most unix systems which use dlopen (default )
// Each part of the ifdef contains a complete implementation for
// the static methods of cmDynamicLoader.
class cmDynamicLoaderCache
{
public:
~cmDynamicLoaderCache();
void CacheFile(const char* path, const cmLibHandle&);
bool GetCacheFile(const char* path, cmLibHandle&);
bool FlushCache(const char* path);
void FlushCache();
static cmDynamicLoaderCache* GetInstance();
private:
std::map<cmStdString, cmLibHandle> m_CacheMap;
static cmDynamicLoaderCache* Instance;
};
cmDynamicLoaderCache* cmDynamicLoaderCache::Instance = 0;
cmDynamicLoaderCache::~cmDynamicLoaderCache()
{
}
void cmDynamicLoaderCache::CacheFile(const char* path, const cmLibHandle& p)
{
cmLibHandle h;
if ( this->GetCacheFile(path, h) )
{
this->FlushCache(path);
}
this->m_CacheMap[path] = p;
}
bool cmDynamicLoaderCache::GetCacheFile(const char* path, cmLibHandle& p)
{
std::map<cmStdString, cmLibHandle>::iterator it = m_CacheMap.find(path);
if ( it != m_CacheMap.end() )
{
p = it->second;
return true;
}
return false;
}
bool cmDynamicLoaderCache::FlushCache(const char* path)
{
std::map<cmStdString, cmLibHandle>::iterator it = m_CacheMap.find(path);
bool ret = false;
if ( it != m_CacheMap.end() )
{
cmDynamicLoader::CloseLibrary(it->second);
m_CacheMap.erase(it);
ret = true;
}
return ret;
}
void cmDynamicLoaderCache::FlushCache()
{
for ( std::map<cmStdString, cmLibHandle>::iterator it = m_CacheMap.begin();
it != m_CacheMap.end(); it++ )
{
cmDynamicLoader::CloseLibrary(it->second);
}
delete cmDynamicLoaderCache::Instance;
cmDynamicLoaderCache::Instance = 0;
}
cmDynamicLoaderCache* cmDynamicLoaderCache::GetInstance()
{
if ( !cmDynamicLoaderCache::Instance )
{
cmDynamicLoaderCache::Instance = new cmDynamicLoaderCache;
}
return cmDynamicLoaderCache::Instance;
}
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// ---------------------------------------------------------------
// 1. Implementation for HPUX machines
#ifdef __hpux
#define CMDYNAMICLOADER_DEFINED 1
#include <dl.h>
cmLibHandle cmDynamicLoader::OpenLibrary(const char* libname )
{
cmLibHandle lh;
if ( cmDynamicLoaderCache::GetInstance()->GetCacheFile(libname, lh) )
{
return lh;
}
lh = shl_load(libname, BIND_DEFERRED | DYNAMIC_PATH, 0L);
cmDynamicLoaderCache::GetInstance()->CacheFile(libname, lh);
return lh;
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}
int cmDynamicLoader::CloseLibrary(cmLibHandle lib)
{
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return !shl_unload(lib);
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}
cmDynamicLoaderFunction
cmDynamicLoader::GetSymbolAddress(cmLibHandle lib, const char* sym)
{
void* addr;
int status;
status = shl_findsym (&lib, sym, TYPE_PROCEDURE, &addr);
void* result = (status < 0) ? (void*)0 : addr;
// Hack to cast pointer-to-data to pointer-to-function.
return *reinterpret_cast<cmDynamicLoaderFunction*>(&result);
}
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const char* cmDynamicLoader::LastError()
{
return 0;
}
#endif
// ---------------------------------------------------------------
// 2. Implementation for Darwin (including OSX) Machines
#ifdef __APPLE__
#define CMDYNAMICLOADER_DEFINED
#include <mach-o/dyld.h>
cmLibHandle cmDynamicLoader::OpenLibrary(const char* libname )
{
cmLibHandle lh;
if ( cmDynamicLoaderCache::GetInstance()->GetCacheFile(libname, lh) )
{
return lh;
}
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NSObjectFileImageReturnCode rc;
NSObjectFileImage image = 0;
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rc = NSCreateObjectFileImageFromFile(libname, &image);
if(!image)
{
return 0;
}
lh = NSLinkModule(image, libname, TRUE);
if(lh)
{
cmDynamicLoaderCache::GetInstance()->CacheFile(libname, lh);
}
return lh;
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}
int cmDynamicLoader::CloseLibrary(cmLibHandle lib)
{
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// we have to use lib because the macro may not...
(void)lib;
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NSUnLinkModule(lib, FALSE);
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return 1;
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}
cmDynamicLoaderFunction
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cmDynamicLoader::GetSymbolAddress(cmLibHandle /* lib */, const char* sym)
{
void *result=0;
if(NSIsSymbolNameDefined(sym))
{
NSSymbol symbol= NSLookupAndBindSymbol(sym);
if(symbol)
{
result = NSAddressOfSymbol(symbol);
}
}
// Hack to cast pointer-to-data to pointer-to-function.
return *reinterpret_cast<cmDynamicLoaderFunction*>(&result);
}
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const char* cmDynamicLoader::LastError()
{
return 0;
}
#endif
// ---------------------------------------------------------------
// 3. Implementation for Windows win32 code
#ifdef _WIN32
#include <windows.h>
#define CMDYNAMICLOADER_DEFINED 1
cmLibHandle cmDynamicLoader::OpenLibrary(const char* libname )
{
cmLibHandle lh;
if ( cmDynamicLoaderCache::GetInstance()->GetCacheFile(libname, lh) )
{
return lh;
}
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#ifdef UNICODE
wchar_t *libn = new wchar_t [mbstowcs(NULL, libname, 32000)];
mbstowcs(libn, libname, 32000);
cmLibHandle ret = LoadLibrary(libn);
delete [] libn;
lh = ret;
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#else
lh = LoadLibrary(libname);
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#endif
cmDynamicLoaderCache::GetInstance()->CacheFile(libname, lh);
return lh;
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}
int cmDynamicLoader::CloseLibrary(cmLibHandle lib)
{
return (int)FreeLibrary(lib);
}
cmDynamicLoaderFunction
cmDynamicLoader::GetSymbolAddress(cmLibHandle lib, const char* sym)
{
#ifdef UNICODE
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wchar_t *wsym = new wchar_t [mbstowcs(NULL, sym, 32000)];
mbstowcs(wsym, sym, 32000);
void *ret = GetProcAddress(lib, wsym);
delete [] wsym;
void* result = ret;
#else
void* result = (void*)GetProcAddress(lib, sym);
#endif
// Hack to cast pointer-to-data to pointer-to-function.
return *reinterpret_cast<cmDynamicLoaderFunction*>(&result);
}
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const char* cmDynamicLoader::LastError()
{
LPVOID lpMsgBuf;
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL
);
// Free the buffer.
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static char* str = 0;
delete [] str;
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str = strcpy(new char[strlen((char*)lpMsgBuf)+1], (char*)lpMsgBuf);
LocalFree( lpMsgBuf );
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return str;
}
#endif
// ---------------------------------------------------------------
// 4. Implementation for default UNIX machines.
// if nothing has been defined then use this
#ifndef CMDYNAMICLOADER_DEFINED
#define CMDYNAMICLOADER_DEFINED
// Setup for most unix machines
#include <dlfcn.h>
cmLibHandle cmDynamicLoader::OpenLibrary(const char* libname )
{
cmLibHandle lh;
if ( cmDynamicLoaderCache::GetInstance()->GetCacheFile(libname, lh) )
{
return lh;
}
lh = dlopen(libname, RTLD_LAZY);
cmDynamicLoaderCache::GetInstance()->CacheFile(libname, lh);
return lh;
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}
int cmDynamicLoader::CloseLibrary(cmLibHandle lib)
{
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return !(int)dlclose(lib);
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}
cmDynamicLoaderFunction
cmDynamicLoader::GetSymbolAddress(cmLibHandle lib, const char* sym)
{
void* result = dlsym(lib, sym);
// Hack to cast pointer-to-data to pointer-to-function.
return *reinterpret_cast<cmDynamicLoaderFunction*>(&result);
}
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const char* cmDynamicLoader::LastError()
{
return dlerror();
}
#endif
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void cmDynamicLoader::FlushCache()
{
cmDynamicLoaderCache::GetInstance()->FlushCache();
}
// Stay consistent with the Modules/Platform directory as
// to what the correct prefix and lib extension
const char* cmDynamicLoader::LibPrefix()
{
return CMAKE_SHARED_MODULE_PREFIX;
}
const char* cmDynamicLoader::LibExtension()
{
return CMAKE_SHARED_MODULE_SUFFIX;
}