X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/886dd7d28e50c003cc88b81b968d487a3c17b0d7..c9ccc09c64f4c29d4667796bef7b507d9e8d25ed:/include/wx/dynlib.h?ds=inline diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h index 5e7efb7d86..a5f60686cf 100644 --- a/include/wx/dynlib.h +++ b/include/wx/dynlib.h @@ -12,224 +12,399 @@ #ifndef _WX_DYNLIB_H__ #define _WX_DYNLIB_H__ -#if defined(__GNUG__) && !defined(__APPLE__) -# pragma interface "dynlib.h" -#endif +#include "wx/defs.h" -#include "wx/setup.h" +#if wxUSE_DYNLIB_CLASS -#if wxUSE_DYNAMIC_LOADER +#include "wx/string.h" +#include "wx/dynarray.h" -#include "wx/dynload.h" // Use the new (version of) wxDynamicLibrary instead +// note that we have our own dlerror() implementation under Darwin +#if (defined(HAVE_DLERROR) && !defined(__EMX__)) || defined(__DARWIN__) + #define wxHAVE_DYNLIB_ERROR +#endif -#elif wxUSE_DYNLIB_CLASS +class WXDLLIMPEXP_FWD_BASE wxDynamicLibraryDetailsCreator; -#include "wx/string.h" -#include "wx/list.h" -#include "wx/hash.h" - -// this is normally done by configure, but I leave it here for now... -#if defined(__UNIX__) && !(defined(HAVE_DLOPEN) || defined(HAVE_SHL_LOAD)) -# if defined(__LINUX__) || defined(__SOLARIS__) || defined(__SUNOS__) || defined(__FREEBSD__) -# define HAVE_DLOPEN -# elif defined(__HPUX__) -# define HAVE_SHL_LOAD -# endif // Unix flavour -#endif // !Unix or already have some HAVE_xxx defined - -// Note: WXPM/EMX has to be tested first, since we want to use +// ---------------------------------------------------------------------------- +// 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(__WXPM__) || defined(__EMX__) -# define INCL_DOS -# include - typedef HMODULE wxDllType; +#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; + #include + typedef void *wxDllType; #elif defined(HAVE_SHL_LOAD) -# include - typedef shl_t wxDllType; -#elif defined(__WINDOWS__) -# include // needed to get HMODULE - typedef HMODULE wxDllType; -#elif defined(__DARWIN__) - typedef void *wxDllType; + #include + typedef shl_t wxDllType; #elif defined(__WXMAC__) - typedef void *wxDllType; + #include + typedef CFragConnectionID wxDllType; #else -# error "wxLibrary can't be compiled on this platform, sorry." -#endif // OS - -// LoadLibrary is defined in windows.h as LoadLibraryA, but wxDllLoader method -// should be called LoadLibrary, not LoadLibraryA or LoadLibraryW! -#if defined(__WIN32__) && defined(LoadLibrary) -# include "wx/msw/winundef.h" + #error "Dynamic Loading classes can't be compiled on this platform, sorry." #endif // ---------------------------------------------------------------------------- -// wxDllLoader: low level DLL functions, use wxDynamicLibrary in your code +// constants // ---------------------------------------------------------------------------- -/* - wxDllLoader is a class providing an interface similar to unix's dlopen(). - It is used by wxDynamicLibrary wxLibrary and manages the actual loading of - DLLs and the resolving of symbols in them. There are no instances of this - class, it simply serves as a namespace for its static member functions. -*/ -class WXDLLEXPORT_BASE wxDllLoader +enum wxDLFlags { -public: - /* - This function loads the shared library libname into memory. - - libname may be either the full path to the file or just the filename in - which case the library is searched for in all standard locations - (use GetDllExt() to construct the filename) - - if success pointer is not NULL, it will be filled with TRUE if everything - went ok and FALSE otherwise - */ - static wxDllType LoadLibrary(const wxString& libname, bool *success = 0); - - /* - This function unloads the shared library previously loaded with - LoadLibrary - */ - static void UnloadLibrary(wxDllType dll); - - /* - This function returns 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(); - - /* - This function resolves a symbol in a loaded DLL, such as a - variable or function name. - - dllHandle Handle of the DLL, as returned by LoadDll(). - name Name of the symbol. - - Returns the pointer to the symbol or NULL on error. - */ - static void *GetSymbol(wxDllType dllHandle, - const wxString &name, - bool *success = NULL); - - // return the standard DLL extension (with leading dot) for this platform - static const wxString &GetDllExt() { return ms_dllext; } + 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 +}; -private: - // forbid construction of objects - wxDllLoader(); - static const wxString ms_dllext; +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 }; // ---------------------------------------------------------------------------- -// wxDynamicLibrary - friendly interface to wxDllLoader +// macros // ---------------------------------------------------------------------------- -class WXDLLEXPORT_BASE wxDynamicLibrary +// 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 __WXMSW__ + +// 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 // __WXMSW__ + +// 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: - // ctors - wxDynamicLibrary() { m_library = 0; } - wxDynamicLibrary(const wxString& name) { Load(name); } + // ctor, normally never used as these objects are only created by + // wxDynamicLibrary::ListLoaded() + wxDynamicLibraryDetails() { m_address = NULL; m_length = 0; } + + // get the (base) name + wxString GetName() const { return m_name; } - // return TRUE if the library was loaded successfully - bool IsLoaded() const { return m_library != 0; } - operator bool() const { return IsLoaded(); } + // get the full path of this object + wxString GetPath() const { return m_path; } - // load the library with the given name (full or not), return TRUE on - // success - bool Load(const wxString& name) + // get the load address and the extent, return true if this information is + // available + bool GetAddress(void **addr, size_t *len) const { - m_library = wxDllLoader::LoadLibrary(name); + if ( !m_address ) + return false; - return IsLoaded(); - } + if ( addr ) + *addr = m_address; + if ( len ) + *len = m_length; - // unload the library, also done automatically in dtor - void Unload() - { - if ( IsLoaded() ) - wxDllLoader::UnloadLibrary(m_library); + return true; } - // load a symbol from the library, return NULL if an error occured or - // symbol wasn't found - void *GetSymbol(const wxString& name) const + // return the version of the DLL (may be empty if no version info) + wxString GetVersion() const { - wxCHECK_MSG( IsLoaded(), NULL, - _T("can't load symbol from unloaded library") ); - - return wxDllLoader::GetSymbol(m_library, name); + return m_version; } - // unload the library - // - // NB: dtor is not virtual, don't derive from this class - ~wxDynamicLibrary() { Unload(); } - private: - // the handle to DLL or NULL - wxDllType m_library; + wxString m_name, + m_path, + m_version; - // no copy ctor/assignment operators (or we'd try to unload the library - // twice) - DECLARE_NO_COPY_CLASS(wxDynamicLibrary) + void *m_address; + size_t m_length; + + friend class wxDynamicLibraryDetailsCreator; }; +WX_DECLARE_USER_EXPORTED_OBJARRAY(wxDynamicLibraryDetails, + wxDynamicLibraryDetailsArray, + WXDLLIMPEXP_BASE); + // ---------------------------------------------------------------------------- -// wxLibrary +// wxDynamicLibrary: represents a handle to a DLL/shared object // ---------------------------------------------------------------------------- -class WXDLLEXPORT_BASE wxLibrary : public wxObject +class WXDLLIMPEXP_BASE wxDynamicLibrary { public: - wxLibrary(wxDllType handle); - virtual ~wxLibrary(); + // 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); - // Get a symbol from the dynamic library - void *GetSymbol(const wxString& symbname); + // 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; } - // Create the object whose classname is "name" - wxObject *CreateObject(const wxString& name); + // 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 + } + +#ifdef __WXMSW__ + // 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 // __WXMSW__ + + // 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); + + // return plugin directory on platforms where it makes sense and empty + // string on others: + static wxString GetPluginsDirectory(); + + +#ifdef __WXMSW__ + // 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 char *name, void *addr); +#endif // __WXMSW__ protected: - void PrepareClasses(wxClassInfo *first); + // 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; -public: - wxHashTable classTable; + // no copy ctor/assignment operators (or we'd try to unload the library + // twice) + wxDECLARE_NO_COPY_CLASS(wxDynamicLibrary); }; +#ifdef __WXMSW__ + // ---------------------------------------------------------------------------- -// wxLibraries +// wxLoadedDLL is a MSW-only internal helper class allowing to dynamically bind +// to a DLL already loaded into the project address space // ---------------------------------------------------------------------------- -class WXDLLEXPORT_BASE wxLibraries +class wxLoadedDLL : public wxDynamicLibrary { public: - wxLibraries(); - ~wxLibraries(); - - // caller is responsible for deleting the returned pointer if !NULL - wxLibrary *LoadLibrary(const wxString& basename); - - wxObject *CreateObject(const wxString& name); + wxLoadedDLL(const wxString& dllname) + : wxDynamicLibrary(dllname, wxDL_GET_LOADED | wxDL_VERBATIM | wxDL_QUIET) + { + } -protected: - wxList m_loaded; + ~wxLoadedDLL() + { + Detach(); + } }; -// ---------------------------------------------------------------------------- -// Global variables -// ---------------------------------------------------------------------------- - -extern WXDLLEXPORT_DATA_BASE(wxLibraries) wxTheLibraries; +#endif // __WXMSW__ // ---------------------------------------------------------------------------- // Interesting defines