3d7fa4e684
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16252 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
322 lines
10 KiB
C++
322 lines
10 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: dynload.h
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// Purpose: Dynamic loading framework
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// Author: Ron Lee, David Falkinder, Vadim Zeitlin and a cast of 1000's
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// (derived in part from dynlib.cpp (c) 1998 Guilhem Lavaux)
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// Modified by:
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// Created: 03/12/01
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// RCS-ID: $Id$
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// Copyright: (c) 2001 Ron Lee <ron@debian.org>
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// Licence: wxWindows license
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_DYNAMICLOADER_H__
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#define _WX_DYNAMICLOADER_H__
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#ifdef __GNUG__
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#pragma interface "dynload.h"
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#endif
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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#include "wx/defs.h"
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#if wxUSE_DYNAMIC_LOADER
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#include "wx/hash.h"
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#include "wx/module.h"
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// FIXME: can this go in private.h or something too??
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#if defined(__WXPM__) || defined(__EMX__)
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#define INCL_DOS
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#include <os2.h>
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#endif
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#ifdef __WXMSW__
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#include "wx/msw/private.h"
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#endif
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// Ugh, I'd much rather this was typesafe, but no time
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// to rewrite wxHashTable right now..
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typedef wxHashTable wxDLManifest;
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typedef wxHashTable wxDLImports;
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// ----------------------------------------------------------------------------
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// conditional compilation
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// ----------------------------------------------------------------------------
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// Note: WXPM/EMX has to be tested first, since we want to use
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// native version, even if configure detected presence of DLOPEN.
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#if defined(__WXPM__) || defined(__EMX__) || defined(__WINDOWS__)
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typedef HMODULE wxDllType;
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#elif defined(HAVE_DLOPEN)
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#include <dlfcn.h>
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typedef void *wxDllType;
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#elif defined(HAVE_SHL_LOAD)
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#include <dl.h>
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typedef shl_t wxDllType;
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#elif defined(__DARWIN__)
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typedef void *wxDllType;
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#elif defined(__WXMAC__)
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typedef CFragConnectionID wxDllType;
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#else
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#error "Dynamic Loading classes can't be compiled on this platform, sorry."
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#endif
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// ---------------------------------------------------------------------------
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// wxDynamicLibrary
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// ---------------------------------------------------------------------------
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//FIXME: This class isn't really common at all, it should be moved
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// into platform dependent files.
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// NOTE: this class is (deliberately) not virtual, do not attempt
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// to use it polymorphically.
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enum wxDLFlags
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{
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wxDL_LAZY = 0x00000001, // resolve undefined symbols at first use
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wxDL_NOW = 0x00000002, // resolve undefined symbols on load
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wxDL_GLOBAL = 0x00000004, // export extern symbols to subsequently
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// loaded libs.
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wxDL_VERBATIM = 0x00000008, // Attempt to load the supplied library
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// name without appending the usual dll
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// filename extension.
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wxDL_NOSHARE = 0x00000010, // load new DLL, don't reuse already loaded
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// FIXME: why? (VZ)
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#ifdef __osf__
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wxDL_DEFAULT = wxDL_LAZY
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#else
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wxDL_DEFAULT = wxDL_LAZY | wxDL_GLOBAL
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#endif
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};
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class WXDLLEXPORT wxDynamicLibrary
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{
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public:
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// return a valid handle for the main program itself or NULL if
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// back linking is not supported by the current platform (e.g. Win32)
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static wxDllType GetProgramHandle();
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// return the platform standard DLL extension (with leading dot)
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static const wxChar *GetDllExt() { return ms_dllext; }
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wxDynamicLibrary() : m_handle(0) {}
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wxDynamicLibrary(wxString libname, int flags = wxDL_DEFAULT)
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: m_handle(0)
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{
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Load(libname, flags);
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}
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~wxDynamicLibrary() { Unload(); }
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// return TRUE if the library was loaded successfully
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bool IsLoaded() const { return m_handle != 0; }
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// load the library with the given name
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// (full or not), return TRUE on success
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bool Load(wxString libname, int flags = wxDL_DEFAULT);
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// unload the library, also done automatically in dtor
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void Unload();
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// Return the raw handle from dlopen and friends.
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wxDllType GetLibHandle() const { return m_handle; }
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// resolve a symbol in a loaded DLL, such as a variable or function
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// name. 'name' is the (possibly mangled) name of the symbol.
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// (use extern "C" to export unmangled names)
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//
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// Since it is perfectly valid for the returned symbol to actually be
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// NULL, that is not always indication of an error. Pass and test the
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// parameter 'success' for a true indication of success or failure to
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// load the symbol.
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//
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// Returns a pointer to the symbol on success, or NULL if an error
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// occurred or the symbol wasn't found.
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void *GetSymbol(const wxString& name, bool *success = 0) const;
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#if WXWIN_COMPATIBILITY_2_2
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operator bool() const { return IsLoaded(); }
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#endif
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protected:
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// Platform specific shared lib suffix.
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static const wxChar *ms_dllext;
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// the handle to DLL or NULL
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wxDllType m_handle;
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// no copy ctor/assignment operators
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// or we'd try to unload the library twice
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DECLARE_NO_COPY_CLASS(wxDynamicLibrary)
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};
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// ---------------------------------------------------------------------------
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// wxPluginLibrary
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// ---------------------------------------------------------------------------
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// NOTE: Do not attempt to use a base class pointer to this class.
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// wxDL is not virtual and we deliberately hide some of it's
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// methods here.
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//
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// Unless you know exacty why you need to, you probably shouldn't
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// instantiate this class directly anyway, use wxPluginManager
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// instead.
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class WXDLLEXPORT wxPluginLibrary : public wxDynamicLibrary
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{
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public:
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static wxDLImports* ms_classes; // Static hash of all imported classes.
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wxPluginLibrary( const wxString &libname, int flags = wxDL_DEFAULT );
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~wxPluginLibrary();
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wxPluginLibrary *RefLib();
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bool UnrefLib();
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// These two are called by the PluginSentinel on (PLUGGABLE) object
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// creation/destruction. There is usually no reason for the user to
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// call them directly. We have to separate this from the link count,
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// since the two are not interchangeable.
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// FIXME: for even better debugging PluginSentinel should register
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// the name of the class created too, then we can state
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// exactly which object was not destroyed which may be
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// difficult to find otherwise. Also this code should
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// probably only be active in DEBUG mode, but let's just
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// get it right first.
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void RefObj() { ++m_objcount; }
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void UnrefObj()
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{
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wxASSERT_MSG( m_objcount > 0, _T("Too many objects deleted??") );
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--m_objcount;
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}
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// Override/hide some base class methods
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bool IsLoaded() const { return m_linkcount > 0; }
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void Unload() { UnrefLib(); }
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private:
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wxClassInfo *m_before; // sm_first before loading this lib
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wxClassInfo *m_after; // ..and after.
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size_t m_linkcount; // Ref count of library link calls
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size_t m_objcount; // ..and (pluggable) object instantiations.
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wxModuleList m_wxmodules; // any wxModules that we initialised.
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void UpdateClassInfo(); // Update the wxClassInfo table
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void RestoreClassInfo(); // Restore the original wxClassInfo state.
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void RegisterModules(); // Init any wxModules in the lib.
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void UnregisterModules(); // Cleanup any wxModules we installed.
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DECLARE_NO_COPY_CLASS(wxPluginLibrary)
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};
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class WXDLLEXPORT wxPluginManager
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{
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public:
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// Static accessors.
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static wxPluginLibrary *LoadLibrary( const wxString &libname,
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int flags = wxDL_DEFAULT );
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static bool UnloadLibrary(const wxString &libname);
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// This is used by wxDllLoader. It's wrapped in the compatibility
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// macro because it's of arguable use outside of that.
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#if WXWIN_COMPATIBILITY_2_2
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static wxPluginLibrary *GetObjectFromHandle(wxDllType handle);
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#endif
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// Instance methods.
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wxPluginManager() : m_entry(0) {};
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wxPluginManager(const wxString &libname, int flags = wxDL_DEFAULT)
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{
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Load(libname, flags);
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}
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~wxPluginManager() { Unload(); }
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bool Load(const wxString &libname, int flags = wxDL_DEFAULT);
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void Unload();
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bool IsLoaded() const { return m_entry && m_entry->IsLoaded(); }
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void *GetSymbol(const wxString &symbol, bool *success = 0)
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{
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return m_entry->GetSymbol( symbol, success );
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}
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static void CreateManifest() { ms_manifest = new wxDLManifest(wxKEY_STRING); }
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static void ClearManifest() { delete ms_manifest; ms_manifest = NULL; }
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private:
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static wxDLManifest* ms_manifest; // Static hash of loaded libs.
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wxPluginLibrary* m_entry; // Cache our entry in the manifest.
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// We could allow this class to be copied if we really
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// wanted to, but not without modification.
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DECLARE_NO_COPY_CLASS(wxPluginManager)
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};
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// ---------------------------------------------------------------------------
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// wxDllLoader
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// ---------------------------------------------------------------------------
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// Cross platform wrapper for dlopen and friends.
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// There are no instances of this class, it simply
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// serves as a namespace for its static member functions.
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#if WXWIN_COMPATIBILITY_2_2
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class WXDLLEXPORT wxDllLoader
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{
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public:
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static wxDllType LoadLibrary(const wxString& name, bool *success = NULL);
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static void UnloadLibrary(wxDllType dll);
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static wxDllType GetProgramHandle() { return wxDynamicLibrary::GetProgramHandle(); }
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static void *GetSymbol(wxDllType dllHandle, const wxString &name, bool *success = 0);
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static wxString GetDllExt() { return wxDynamicLibrary::GetDllExt(); }
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private:
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wxDllLoader(); // forbid construction of objects
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};
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#endif
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#endif // wxUSE_DYNAMIC_LOADER
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#endif // _WX_DYNAMICLOADER_H__
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