X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/7b0bfbb256f85a6b98fcea7fa09fde5112b964d4..80dcb89812d84f41567a69ff83769b26ab519468:/include/wx/dynlib.h diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h index 745cdddcd0..359444c061 100644 --- a/include/wx/dynlib.h +++ b/include/wx/dynlib.h @@ -1,106 +1,421 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: dynlib.cpp -// Purpose: Dynamic library management -// Author: Guilhem Lavaux +// Name: wx/dynlib.h +// Purpose: Dynamic library loading classes +// Author: Guilhem Lavaux, Vadim Zeitlin, Vaclav Slavik // Modified by: // Created: 20/07/98 // RCS-ID: $Id$ -// Copyright: (c) Guilhem Lavaux -// Licence: wxWindows license +// Copyright: (c) 1998 Guilhem Lavaux +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// #ifndef _WX_DYNLIB_H__ #define _WX_DYNLIB_H__ -#ifdef __GNUG__ - #pragma interface -#endif +#include "wx/defs.h" -#include -#include -#include +#if wxUSE_DYNLIB_CLASS -#if defined(HAVE_DLOPEN) - #include +#include "wx/string.h" +#include "wx/dynarray.h" - typedef void *wxDllType; -#elif defined(HAVE_SHLLOAD) - #include +// note that we have our own dlerror() implementation under Darwin +#if (defined(HAVE_DLERROR) && !defined(__EMX__)) || defined(__DARWIN__) + #define wxHAVE_DYNLIB_ERROR +#endif - typedef void *wxDllType; -#elif defined(__WINDOWS__) - #include +class WXDLLIMPEXP_FWD_BASE wxDynamicLibraryDetailsCreator; - typedef HMODULE wxDllType; +// ---------------------------------------------------------------------------- +// conditional compilation +// ---------------------------------------------------------------------------- + +// Note: __OS2__/EMX has to be tested first, since we want to use +// native version, even if configure detected presence of DLOPEN. +#if defined(__OS2__) || defined(__EMX__) || defined(__WINDOWS__) + typedef WXHMODULE wxDllType; +#elif defined(__DARWIN__) + // Don't include dlfcn.h on Darwin, we may be using our own replacements. + typedef void *wxDllType; +#elif defined(HAVE_DLOPEN) + #include + typedef void *wxDllType; +#elif defined(HAVE_SHL_LOAD) + #include + typedef shl_t wxDllType; #elif defined(__WXMAC__) - typedef CFragConnectionID wxDllType; + #include + typedef CFragConnectionID wxDllType; #else - #error "wxLibrary can't be compiled on this platform, sorry." -#endif // OS - -// defined in windows.h -#ifdef LoadLibrary - #undef LoadLibrary + #error "Dynamic Loading classes can't be compiled on this platform, sorry." #endif // ---------------------------------------------------------------------------- -// wxLibrary +// constants // ---------------------------------------------------------------------------- -class wxLibrary : public wxObject +enum wxDLFlags { -public: - wxHashTable classTable; + wxDL_LAZY = 0x00000001, // resolve undefined symbols at first use + // (only works on some Unix versions) + wxDL_NOW = 0x00000002, // resolve undefined symbols on load + // (default, always the case under Win32) + wxDL_GLOBAL = 0x00000004, // export extern symbols to subsequently + // loaded libs. + wxDL_VERBATIM = 0x00000008, // attempt to load the supplied library + // name without appending the usual dll + // filename extension. + + // this flag is obsolete, don't use + wxDL_NOSHARE = 0x00000010, // load new DLL, don't reuse already loaded + // (only for wxPluginManager) + + wxDL_QUIET = 0x00000020, // don't log an error if failed to load + + // this flag is dangerous, for internal use of wxMSW only, don't use at all + // and especially don't use directly, use wxLoadedDLL instead if you really + // do need it + wxDL_GET_LOADED = 0x00000040, // Win32 only: return handle of already + // loaded DLL or NULL otherwise; Unload() + // should not be called so don't forget to + // Detach() if you use this function + + wxDL_DEFAULT = wxDL_NOW // default flags correspond to Win32 +}; + +enum wxDynamicLibraryCategory +{ + wxDL_LIBRARY, // standard library + wxDL_MODULE // loadable module/plugin +}; + +enum wxPluginCategory +{ + wxDL_PLUGIN_GUI, // plugin that uses GUI classes + wxDL_PLUGIN_BASE // wxBase-only plugin +}; + +// ---------------------------------------------------------------------------- +// macros +// ---------------------------------------------------------------------------- + +// when loading a function from a DLL you always have to cast the returned +// "void *" pointer to the correct type and, even more annoyingly, you have to +// repeat this type twice if you want to declare and define a function pointer +// all in one line +// +// this macro makes this slightly less painful by allowing you to specify the +// type only once, as the first parameter, and creating a variable of this type +// called "pfn" initialized with the "name" from the "dynlib" +#define wxDYNLIB_FUNCTION(type, name, dynlib) \ + type pfn ## name = (type)(dynlib).GetSymbol(wxT(#name)) + + +// a more convenient function replacing wxDYNLIB_FUNCTION above +// +// it uses the convention that the type of the function is its name suffixed +// with "_t" but it doesn't define a variable but just assigns the loaded value +// to it and also allows to pass it the prefix to be used instead of hardcoding +// "pfn" (the prefix can be "m_" or "gs_pfn" or whatever) +// +// notice that this function doesn't generate error messages if the symbol +// couldn't be loaded, the caller should generate the appropriate message +#define wxDL_INIT_FUNC(pfx, name, dynlib) \ + pfx ## name = (name ## _t)(dynlib).RawGetSymbol(#name) + +#ifdef __WINDOWS__ + +// same as wxDL_INIT_FUNC() but appends 'A' or 'W' to the function name, see +// wxDynamicLibrary::GetSymbolAorW() +#define wxDL_INIT_FUNC_AW(pfx, name, dynlib) \ + pfx ## name = (name ## _t)(dynlib).GetSymbolAorW(#name) + +#endif // __WINDOWS__ + +// the following macros can be used to redirect a whole library to a class and +// check at run-time if the library is present and contains all required +// methods +// +// notice that they are supposed to be used inside a class which has "m_ok" +// member variable indicating if the library had been successfully loaded +// helper macros constructing the name of the variable storing the function +// pointer and the name of its type from the function name +#define wxDL_METHOD_NAME(name) m_pfn ## name +#define wxDL_METHOD_TYPE(name) name ## _t + +// parameters are: +// - rettype: return type of the function, e.g. "int" +// - name: name of the function, e.g. "foo" +// - args: function signature in parentheses, e.g. "(int x, int y)" +// - argnames: the names of the parameters in parentheses, e.g. "(x, y)" +// - defret: the value to return if the library wasn't successfully loaded +#define wxDL_METHOD_DEFINE( rettype, name, args, argnames, defret ) \ + typedef rettype (* wxDL_METHOD_TYPE(name)) args ; \ + wxDL_METHOD_TYPE(name) wxDL_METHOD_NAME(name); \ + rettype name args \ + { return m_ok ? wxDL_METHOD_NAME(name) argnames : defret; } + +#define wxDL_VOIDMETHOD_DEFINE( name, args, argnames ) \ + typedef void (* wxDL_METHOD_TYPE(name)) args ; \ + wxDL_METHOD_TYPE(name) wxDL_METHOD_NAME(name); \ + void name args \ + { if ( m_ok ) wxDL_METHOD_NAME(name) argnames ; } + +#define wxDL_METHOD_LOAD(lib, name) \ + wxDL_METHOD_NAME(name) = \ + (wxDL_METHOD_TYPE(name)) lib.GetSymbol(#name, &m_ok); \ + if ( !m_ok ) return false + +// ---------------------------------------------------------------------------- +// wxDynamicLibraryDetails: contains details about a loaded wxDynamicLibrary +// ---------------------------------------------------------------------------- + +class WXDLLIMPEXP_BASE wxDynamicLibraryDetails +{ public: - wxLibrary(void *handle); - ~wxLibrary(); + // ctor, normally never used as these objects are only created by + // wxDynamicLibrary::ListLoaded() + wxDynamicLibraryDetails() { m_address = NULL; m_length = 0; } - // Get a symbol from the dynamic library - void *GetSymbol(const wxString& symbname); + // get the (base) name + wxString GetName() const { return m_name; } - // Create the object whose classname is "name" - wxObject *CreateObject(const wxString& name); + // get the full path of this object + wxString GetPath() const { return m_path; } -protected: - void PrepareClasses(wxClassInfo *first); + // get the load address and the extent, return true if this information is + // available + bool GetAddress(void **addr, size_t *len) const + { + if ( !m_address ) + return false; - wxDllType m_handle; + if ( addr ) + *addr = m_address; + if ( len ) + *len = m_length; + + return true; + } + + // return the version of the DLL (may be empty if no version info) + wxString GetVersion() const + { + return m_version; + } + +private: + wxString m_name, + m_path, + m_version; + + void *m_address; + size_t m_length; + + friend class wxDynamicLibraryDetailsCreator; }; +WX_DECLARE_USER_EXPORTED_OBJARRAY(wxDynamicLibraryDetails, + wxDynamicLibraryDetailsArray, + WXDLLIMPEXP_BASE); + // ---------------------------------------------------------------------------- -// wxLibraries +// wxDynamicLibrary: represents a handle to a DLL/shared object // ---------------------------------------------------------------------------- -class wxLibraries +class WXDLLIMPEXP_BASE wxDynamicLibrary { public: - wxLibraries(); - ~wxLibraries(); + // return a valid handle for the main program itself or NULL if back + // linking is not supported by the current platform (e.g. Win32) + static wxDllType GetProgramHandle(); + + // return the platform standard DLL extension (with leading dot) + static const wxString& GetDllExt() { return ms_dllext; } + + wxDynamicLibrary() : m_handle(0) { } + wxDynamicLibrary(const wxString& libname, int flags = wxDL_DEFAULT) + : m_handle(0) + { + Load(libname, flags); + } + + // NOTE: this class is (deliberately) not virtual, do not attempt + // to use it polymorphically. + ~wxDynamicLibrary() { Unload(); } + + // return true if the library was loaded successfully + bool IsLoaded() const { return m_handle != 0; } + + // load the library with the given name (full or not), return true if ok + bool Load(const wxString& libname, int flags = wxDL_DEFAULT); + + // raw function for loading dynamic libs: always behaves as if + // wxDL_VERBATIM were specified and doesn't log error message if the + // library couldn't be loaded but simply returns NULL + static wxDllType RawLoad(const wxString& libname, int flags = wxDL_DEFAULT); + + // detach the library object from its handle, i.e. prevent the object from + // unloading the library in its dtor -- the caller is now responsible for + // doing this + wxDllType Detach() { wxDllType h = m_handle; m_handle = 0; return h; } + + // unload the given library handle (presumably returned by Detach() before) + static void Unload(wxDllType handle); + + // unload the library, also done automatically in dtor + void Unload() { if ( IsLoaded() ) { Unload(m_handle); m_handle = 0; } } + + // Return the raw handle from dlopen and friends. + wxDllType GetLibHandle() const { return m_handle; } + + // check if the given symbol is present in the library, useful to verify if + // a loadable module is our plugin, for example, without provoking error + // messages from GetSymbol() + bool HasSymbol(const wxString& name) const + { + bool ok; + DoGetSymbol(name, &ok); + return ok; + } + + // resolve a symbol in a loaded DLL, such as a variable or function name. + // 'name' is the (possibly mangled) name of the symbol. (use extern "C" to + // export unmangled names) + // + // Since it is perfectly valid for the returned symbol to actually be NULL, + // that is not always indication of an error. Pass and test the parameter + // 'success' for a true indication of success or failure to load the + // symbol. + // + // Returns a pointer to the symbol on success, or NULL if an error occurred + // or the symbol wasn't found. + void *GetSymbol(const wxString& name, bool *success = NULL) const; + + // low-level version of GetSymbol() + static void *RawGetSymbol(wxDllType handle, const wxString& name); + void *RawGetSymbol(const wxString& name) const + { +#if defined (__WXPM__) || defined(__EMX__) + return GetSymbol(name); +#else + return RawGetSymbol(m_handle, name); +#endif + } - // caller is responsible for deleting the returned pointer if !NULL - wxLibrary *LoadLibrary(const wxString& basename); +#ifdef __WINDOWS__ + // this function is useful for loading functions from the standard Windows + // DLLs: such functions have an 'A' (in ANSI build) or 'W' (in Unicode, or + // wide character build) suffix if they take string parameters + static void *RawGetSymbolAorW(wxDllType handle, const wxString& name) + { + return RawGetSymbol + ( + handle, + name + +#if wxUSE_UNICODE + L'W' +#else + 'A' +#endif + ); + } + + void *GetSymbolAorW(const wxString& name) const + { + return RawGetSymbolAorW(m_handle, name); + } +#endif // __WINDOWS__ + + // return all modules/shared libraries in the address space of this process + // + // returns an empty array if not implemented or an error occurred + static wxDynamicLibraryDetailsArray ListLoaded(); + + // return platform-specific name of dynamic library with proper extension + // and prefix (e.g. "foo.dll" on Windows or "libfoo.so" on Linux) + static wxString CanonicalizeName(const wxString& name, + wxDynamicLibraryCategory cat = wxDL_LIBRARY); + + // return name of wxWidgets plugin (adds compiler and version info + // to the filename): + static wxString + CanonicalizePluginName(const wxString& name, + wxPluginCategory cat = wxDL_PLUGIN_GUI); - wxObject *CreateObject(const wxString& name); + // return plugin directory on platforms where it makes sense and empty + // string on others: + static wxString GetPluginsDirectory(); + + +#ifdef __WINDOWS__ + // return the handle (HMODULE/HINSTANCE) of the DLL with the given name + // and/or containing the specified address: for XP and later systems only + // the address is used and the name is ignored but for the previous systems + // only the name (which may be either a full path to the DLL or just its + // base name, possibly even without extension) is used + // + // the returned handle reference count is not incremented so it doesn't + // need to be freed using FreeLibrary() but it also means that it can + // become invalid if the DLL is unloaded + static WXHMODULE MSWGetModuleHandle(const wxString& name, void *addr); +#endif // __WINDOWS__ protected: - wxList m_loaded; + // common part of GetSymbol() and HasSymbol() + void *DoGetSymbol(const wxString& name, bool *success = 0) const; + +#ifdef wxHAVE_DYNLIB_ERROR + // log the error after a dlxxx() function failure + static void Error(); +#endif // wxHAVE_DYNLIB_ERROR + + + // platform specific shared lib suffix. + static const wxString ms_dllext; + + // the handle to DLL or NULL + wxDllType m_handle; + + // no copy ctor/assignment operators (or we'd try to unload the library + // twice) + wxDECLARE_NO_COPY_CLASS(wxDynamicLibrary); }; +#ifdef __WINDOWS__ + // ---------------------------------------------------------------------------- -// Global variables +// wxLoadedDLL is a MSW-only internal helper class allowing to dynamically bind +// to a DLL already loaded into the project address space // ---------------------------------------------------------------------------- -extern wxLibraries wxTheLibraries; +class wxLoadedDLL : public wxDynamicLibrary +{ +public: + wxLoadedDLL(const wxString& dllname) + : wxDynamicLibrary(dllname, wxDL_GET_LOADED | wxDL_VERBATIM | wxDL_QUIET) + { + } + + ~wxLoadedDLL() + { + Detach(); + } +}; + +#endif // __WINDOWS__ // ---------------------------------------------------------------------------- // Interesting defines // ---------------------------------------------------------------------------- #define WXDLL_ENTRY_FUNCTION() \ -extern "C" wxClassInfo *wxGetClassFirst(); \ -wxClassInfo *wxGetClassFirst() { \ +extern "C" WXEXPORT const wxClassInfo *wxGetClassFirst(); \ +const wxClassInfo *wxGetClassFirst() { \ return wxClassInfo::GetFirst(); \ } +#endif // wxUSE_DYNLIB_CLASS + #endif // _WX_DYNLIB_H__