364 lines
14 KiB
C
364 lines
14 KiB
C
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/** \file
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* Handle Comet exceptions.
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*/
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/*
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* Copyright 2003 Atex Media Command. All rights reserved.
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* Copyright (C) 2013 Alexander Lamaison <alexander.lamaison@gmail.com>
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*
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* This material is provided "as is", with absolutely no warranty
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* expressed or implied. Any use is at your own risk. Permission to
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* use or copy this software for any purpose is hereby granted without
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* fee, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is
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* granted, provided the above notices are retained, and a notice that
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* the code was modified is included with the above copyright notice.
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*
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* This header is part of Comet version 2.
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* https://github.com/alamaison/comet
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*/
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#ifndef COMET_HANDLE_EXCEPT_H
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#define COMET_HANDLE_EXCEPT_H
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#ifdef _SHOW_INC
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#pragma message(" #Include " __FILE__)
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#endif
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#include <comet/error.h>
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/** \page comethandleexception Custom Exception Handling
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This allows the user to define how exception handling happens for a particular library.
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Unfortunately due to a compiler bug in MSVC 6 (fixed in 7), some of the
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functionality won't be available for that compiler (this has also limited
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the customisability originally designed for).
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To override the default behavior, specialise the struct
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comet::comet_exception_handler<true> and implement the functions defined
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in the default implementation comet::comet_exception_handler.
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\code
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comet {
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template<>
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struct comet_exception_handler<true> : comet_exception_handler<false>
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{
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static inline HRESULT catcher_all( const source_info_t &info)
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{
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throw;
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}
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};
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}
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\endcode
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With a suitable compiler, the method comet::comet_exception_handler::rethrow can be
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overridden to provide support for custom exceptions.
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Don't try putting a try catch round a throw in \p catcher_all as the resulting destruct-twice
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of the exception when using MSV6 will cause very hard to trace bugs.
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*/
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#ifdef COMET_DISABLE_EXCEPTION_RETHROW_CATCH
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#define COMET_CATCH_CLASS_EX(funcName,iid) \
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catch ( const com_error &err) { \
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return comet_exception_handler<true>::catcher_com_error(err, impl::do_get_source_info_t<_B>::exec( static_cast<_B*>(this), source_info_t(funcName, iid))); \
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} catch ( const std::exception &err) { \
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return comet_exception_handler<true>::catcher_exception(err, impl::do_get_source_info_t<_B>::exec( static_cast<_B*>(this), source_info_t(funcName, iid))); \
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} catch ( HRESULT hr ) { \
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return comet_exception_handler<true>::catcher_hr(hr, impl::do_get_source_info_t<_B>::exec( static_cast<_B*>(this), source_info_t(funcName, iid))); \
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} catch (...) { \
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return comet_exception_handler<true>::catcher_all( impl::do_get_source_info_t<_B>::exec( static_cast<_B*>(this), source_info_t(funcName, iid))); \
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}
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#define COMET_CATCH_UNKNOWN(funcName, iid, clsname) \
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catch ( const com_error &err) { \
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comet_exception_handler<true>::catcher_com_error(err, source_info_t(funcName, iid, clsname)); \
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} catch ( const std::exception &err) { \
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comet_exception_handler<true>::catcher_exception(err, source_info_t(funcName, iid, clsname)); \
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} catch ( HRESULT hr ) { \
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comet_exception_handler<true>::catcher_hr(hr, source_info_t(funcName, iid, clsname)); \
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} catch (...) { \
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comet_exception_handler<true>::catcher_all( source_info_t(funcName, iid, clsname)); \
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}
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#else // COMET_DISABLE_EXCEPTION_RETHROW_CATCH
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#define COMET_CATCH_CLASS_EX( funcName, iid) \
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catch ( ... ) { \
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return comet_exception_handler<true>::rethrow( impl::do_get_source_info_t<_B>::exec( static_cast<_B*>(this), source_info_t(funcName, iid))); \
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}
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#define COMET_CATCH_UNKNOWN(funcName, iid, clsname) \
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catch ( ... ) { \
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comet_exception_handler<true>::rethrow( source_info_t(funcName, iid, clsname)); \
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}
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#endif
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/** Macro used in implementation wrappers to hide a bug with catching rethrown
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* classes.
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*/
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#define COMET_CATCH_CLASS(funcName) COMET_CATCH_CLASS_EX(funcName, comtype<interface_is>::uuid())
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// We define these new catch macros because the ones above don't seem to work.
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// They use a mystery _B to get the class name. It may have been part of the
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// old code-generation mechanism which we don't support any more.
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#define COMET_CATCH_INTERFACE_BOUNDARY(funcName) \
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catch ( ... ) { \
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return ::comet::comet_exception_handler<true>::rethrow( \
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::comet::source_info_t( \
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funcName, ::comet::comtype<interface_is>::uuid())); \
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}
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#define COMET_CATCH_CLASS_INTERFACE_BOUNDARY(funcName, clsName) \
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catch ( ... ) { \
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return ::comet::comet_exception_handler<true>::rethrow( \
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::comet::source_info_t( \
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funcName, ::comet::comtype<interface_is>::uuid(), clsName)); \
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}
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namespace comet {
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/*! \addtogroup ErrorHandling
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*/
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//@{
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/// Specifies the source of an exception.
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struct source_info_t
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{
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/// Default Constructor
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source_info_t() {}
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/// Constructor to fill in a few elements.
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source_info_t(const bstr_t &par_function, const uuid_t &par_interface_uuid = uuid_t(), const bstr_t &par_coclass_name = bstr_t() )
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: function_name(par_function), interface_uuid(par_interface_uuid), coclass_name(par_coclass_name) {}
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bstr_t function_name; ///< Name of the function being called.
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bstr_t coclass_name; ///< Coclass the method belongs to.
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uuid_t coclass_uuid; ///< CLSID of the coclass.
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uuid_t interface_uuid; ///< IID of the interface
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bstr_t source_override; ///< Used to override the source description.
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/** Returns the 'source' description, either 'source_overrride' or the
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* concatenation of the coclass and function_name.
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*/
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bstr_t source() const
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{
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if ( !source_override.is_empty())
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{
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return source_override;
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}
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if (coclass_name.is_empty())
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{
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return function_name;
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}
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if (function_name.is_empty())
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{
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return coclass_name;
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}
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return coclass_name + L"." + function_name;
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}
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};
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namespace impl
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{
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/** Redirect logging to calllog if enabled.
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* Used so that if call-logging is loaded, the default action is to
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* redirect the logging to the call-logger.
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* \internal
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*/
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template<bool>
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struct call_logger_redirect_
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{
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template<bool>
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struct exe
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{
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static inline void log_exception(
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const tstring& /*type*/, const tstring& /*desc*/,
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const source_info_t& /*errorSource*/,
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const source_info_t& /*callSource*/)
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{ }
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static inline bool can_log_exception()
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{ return false; }
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};
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};
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}
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/** \struct error_logger_ handle_except.h comet/handle_except.h
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* Default to NULL logger - and description of 'error logger' concept.
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* Specialise to \b true to override.
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*/
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template<bool OVERRIDE>
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struct error_logger_
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{
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/** Should the error be logged?
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* \return Return true to allow error to be logged.
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*/
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static inline bool can_log_exception()
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{
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return impl::call_logger_redirect_<OVERRIDE>::template exe<OVERRIDE>::can_log_exception();
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}
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/// Called by exception handlers to provide logging for errors.
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static inline void log_exception(const tstring &type, const tstring &desc, const source_info_t &errorSource ,const source_info_t &callSource )
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{
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impl::call_logger_redirect_<OVERRIDE>::template exe<OVERRIDE>::log_exception(type,desc,errorSource, callSource);
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}
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};
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/** Common exception handler for comet.
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* Specialize to \c true to overide the behaviour. It is usually convenient
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* to inherit the comet_exception_handler<true> from
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* comet_exception_handler<false>.
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*/
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template< bool OVERRIDE>
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struct comet_exception_handler
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{
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#ifndef COMET_DISABLE_EXCEPTION_RETHROW_CATCH
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/** Override to modify which exceptions are caught.
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* Note that due to a severe bug in MSVC 6, this will not be called in that
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* case.
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*/
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static inline HRESULT rethrow(const source_info_t &info)
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{
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try {
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throw;
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} catch ( const com_error &err)
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{
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return catcher_com_error( err, info);
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}
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catch ( const std::exception &err)
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{
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return catcher_exception( err, info);
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}
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catch ( HRESULT hr )
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{
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return catcher_hr( hr, info );
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}
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catch (...)
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{
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return catcher_all(info);
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}
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}
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#endif // COMET_DISABLE_EXCEPTION_RETHROW_CATCH
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/// Override to modify handling of com_error
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static inline HRESULT catcher_com_error( const com_error &err,const source_info_t &info)
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{
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if ( error_logger_<OVERRIDE>::can_log_exception() )
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{
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source_info_t errorInfo;
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errorInfo.interface_uuid = err.guid();
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errorInfo.source_override = err.source();
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error_logger_<OVERRIDE>::log_exception( _T("comet::com_error"), err.t_str(), errorInfo, info);
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}
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return impl::return_com_error(err, info.source(), info.interface_uuid);
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}
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/// Override to modify handling of std::exception
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static inline HRESULT catcher_exception(const std::exception& err,const source_info_t &info)
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{
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if ( error_logger_<OVERRIDE>::can_log_exception() )
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{
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error_logger_<OVERRIDE>::log_exception( _T("std::exception"),
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bstr_t(err.what()).t_str(),
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source_info_t(), info);
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}
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return impl::return_com_error(err, info.source(), info.interface_uuid);
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}
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/// Override to modify handling of HRESULT
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static inline HRESULT catcher_hr( HRESULT hr,const source_info_t &info)
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{
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return impl::return_com_error(hr, bstr_t(), info.source(), info.interface_uuid);
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}
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/// This can be overridden to provide handling of other exceptions.
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static inline HRESULT catcher_all( const source_info_t &info)
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{
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COMET_NOTUSED(info);
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throw;
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}
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};
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namespace impl
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{
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/** Marker for using the coclass information.
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* \relates handle_exception_default
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*/
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struct handle_exception_default_marker {};
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/** Call the coclasses exception handler if it is marked.
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* \relates handle_exception_default
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*/
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template <typename O>
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struct do_get_source_info_t
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{
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/** Call the classes exception handler.
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* \relates handle_exception_default
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*/
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template <bool USETHIS>
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struct execute_handle
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{
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inline static void get_source_info(O * pThis, source_info_t &info)
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{
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pThis->get_source_info_( info );
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}
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};
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/** Call the default global exception handler.
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* \relates handle_exception_default
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*/
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template <>
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struct execute_handle<false>
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{
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inline static void get_source_info(O *pThis, const source_info_t &info )
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{
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COMET_NOTUSED(pThis);
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COMET_NOTUSED(info);
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// return impl::do_handle_exception<nil, IFACE>(src);
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}
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};
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/** Called by the interface wrappers to call the exception handlers.
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* \relates handle_exception_default
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*/
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inline static source_info_t exec( O *pThis, source_info_t info)
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{
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// Either call the coclass exception handler, or the project default.
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execute_handle<type_traits::conversion<O&, handle_exception_default_marker>::exists>::get_source_info( pThis, info);
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/* ERRORS: If the conversion is ambiguous here, then there are probably two ways of
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* getting to handle_exception_default_marker, usually via handle_exception_default<COCLASS>,
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* which is already provided by by IProvideClassInfoImpl<COCLASS>.
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*/
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return info;
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}
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};
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}
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/** \struct handle_exception_default server.h comet/server.h
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* Used by the exception handler to provide source information for the specified CoClass.
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* Inherit from this class or IProvideClassInfoImpl to make sure that the
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* coclass name is known about for custom coclasses.
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*/
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template<typename COCLASS>
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struct handle_exception_default
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: impl::handle_exception_default_marker // Required to mark the class as being able to handle exceptions with coclass information
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{
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void get_source_info_( source_info_t &info)
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{
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info.coclass_name = COCLASS::name();
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info.coclass_uuid = comtype<COCLASS>::uuid();
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}
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};
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// Handles the case where there is no coclass, and therefore no coclass name.
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template<>
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struct handle_exception_default<nil> : impl::handle_exception_default_marker
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{
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void get_source_info_( source_info_t &info)
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{
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COMET_NOTUSED(info);
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}
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};
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//@}
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||
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}
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||
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#endif /* COMET_HANDLE_EXCEPT_H */
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