initial commit

Signed-off-by: Peter Siegmund <mars3142@noreply.mars3142.dev>

libs/wxWidgets-3.3.1/include/wx/dynlib.h

@@ -0,0 +1,398 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/dynlib.h
+// Purpose:     Dynamic library loading classes
+// Author:      Guilhem Lavaux, Vadim Zeitlin, Vaclav Slavik
+// Created:     20/07/98
+// Copyright:   (c) 1998 Guilhem Lavaux
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_DYNLIB_H__
+#define _WX_DYNLIB_H__
+
+#include "wx/defs.h"
+
+#if wxUSE_DYNLIB_CLASS
+
+#include "wx/string.h"
+#include "wx/dynarray.h"
+
+class WXDLLIMPEXP_FWD_BASE wxDynamicLibraryDetailsCreator;
+
+// ----------------------------------------------------------------------------
+// conditional compilation
+// ----------------------------------------------------------------------------
+
+#if defined(__WINDOWS__)
+    typedef WXHMODULE           wxDllType;
+#elif defined(HAVE_DLOPEN)
+    #include <dlfcn.h>
+    typedef void               *wxDllType;
+#elif defined(__WXMAC__)
+    #include <CodeFragments.h>
+    typedef CFragConnectionID   wxDllType;
+#else
+    #error "Dynamic Loading classes can't be compiled on this platform, sorry."
+#endif
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+enum wxDLFlags
+{
+    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+    // this flag is obsolete, don't use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 nullptr 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<name>" 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:
+    // ctor, normally never used as these objects are only created by
+    // wxDynamicLibrary::ListLoaded()
+    wxDynamicLibraryDetails() { m_address = nullptr; m_length = 0; }
+
+    // get the (base) name
+    wxString GetName() const { return m_name; }
+
+    // get the full path of this object
+    wxString GetPath() const { return m_path; }
+
+    // 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;
+
+        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;
+};
+
+using wxDynamicLibraryDetailsArray = wxBaseArray<wxDynamicLibraryDetails>;
+
+// ----------------------------------------------------------------------------
+// wxDynamicLibrary: represents a handle to a DLL/shared object
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxDynamicLibrary
+{
+public:
+    // return a valid handle for the main program itself or nullptr 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 wxString GetDllExt(wxDynamicLibraryCategory cat = wxDL_LIBRARY);
+
+    wxDynamicLibrary() : m_handle(nullptr) { }
+    wxDynamicLibrary(const wxString& libname, int flags = wxDL_DEFAULT)
+        : m_handle(nullptr)
+    {
+        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 != nullptr; }
+
+    // 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 nullptr
+    static wxDllType RawLoad(const wxString& libname, int flags = wxDL_DEFAULT);
+
+    // attach to an existing handle
+    void Attach(wxDllType h) { Unload(); m_handle = h; }
+
+    // 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 = nullptr; 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 = nullptr; } }
+
+    // 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 nullptr if an error occurred
+    // or the symbol wasn't found.
+    void *GetSymbol(const wxString& name, bool *success = nullptr) const;
+
+    // low-level version of GetSymbol()
+    static void *RawGetSymbol(wxDllType handle, const wxString& name);
+    void *RawGetSymbol(const wxString& name) const
+    {
+        return RawGetSymbol(m_handle, name);
+    }
+
+#ifdef __WINDOWS__
+    // This function is misnamed now as it always loads "W" symbol because we
+    // always use Unicode now, but keeps its old name for compatibility.
+    static void *RawGetSymbolAorW(wxDllType handle, const wxString& name)
+    {
+        return RawGetSymbol
+               (
+                handle,
+                name + L'W'
+               );
+    }
+
+    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);
+
+    // return plugin directory on platforms where it makes sense and empty
+    // string on others:
+    static wxString GetPluginsDirectory();
+
+    // Return the load address of the module containing the given address or
+    // nullptr if not found.
+    //
+    // If path output parameter is non-null, fill it with the full path to this
+    // module disk file on success.
+    static void* GetModuleFromAddress(const void* addr, wxString* path = nullptr);
+
+#ifdef __WINDOWS__
+    // return the handle (HMODULE/HINSTANCE) of the DLL with the given name
+    // and/or containing the specified address: if a valid address is
+    // specified, it is used and then name is ignored, but if the address is
+    // null, 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:
+    // common part of GetSymbol() and HasSymbol()
+    void* DoGetSymbol(const wxString& name, bool* success = nullptr) const;
+
+    // log the error after an OS dynamic library function failure
+    static void ReportError(const wxString& msg,
+                            const wxString& name = wxString());
+
+    // the handle to DLL or nullptr
+    wxDllType m_handle;
+
+    // no copy ctor/assignment operators (or we'd try to unload the library
+    // twice)
+    wxDECLARE_NO_COPY_CLASS(wxDynamicLibrary);
+};
+
+#ifdef __WINDOWS__
+
+// ----------------------------------------------------------------------------
+// wxLoadedDLL is a MSW-only internal helper class allowing to dynamically bind
+// to a DLL already loaded into the project address space
+// ----------------------------------------------------------------------------
+
+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" WXEXPORT const wxClassInfo *wxGetClassFirst(); \
+const wxClassInfo *wxGetClassFirst() { \
+  return wxClassInfo::GetFirst(); \
+}
+
+#endif // wxUSE_DYNLIB_CLASS
+
+#endif // _WX_DYNLIB_H__