C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to implement reflection in C++          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Siegfried Guest Posted: Sun Nov 27, 2005 5:30 am    Post subject: How to implement reflection in C++ Java, C# and other languages allow one to enumerate all the data members of a class or struct thru their respective reflection APIs. Varios Microsoft specific extensions to their C++ compiler allows one to do the same (I'm thinking of both the COM extentions as wells as the managed extensions). I don't believe g++ supports either of these. Does anyone have some sample code that will read a g++ .o file (that was compiled with the debug option turned on), or a g++ executable image and extract the meta data about a type so I can enumerate the datamembers? Thanks, Siegfried Back to top roberts.noah@gmail.com Guest Posted: Sun Nov 27, 2005 7:18 am    Post subject: Re: How to implement reflection in C++ Siegfried wrote: Quote: Java, C# and other languages allow one to enumerate all the data members of a class or struct thru their respective reflection APIs. Varios Microsoft specific extensions to their C++ compiler allows one to do the same (I'm thinking of both the COM extentions as wells as the managed extensions). I don't believe g++ supports either of these. Does anyone have some sample code that will read a g++ .o file (that was compiled with the debug option turned on), or a g++ executable image and extract the meta data about a type so I can enumerate the datamembers? I'm gonna bet that such a thing isn't available. Maybe if you explain why you need it, or think you need it, someone could help you find a more available solution. Back to top peter steiner Guest Posted: Sun Nov 27, 2005 9:51 am    Post subject: Re: How to implement reflection in C++ Siegfried wrote: Quote: Java, C# and other languages allow one to enumerate all the data members of a class or struct thru their respective reflection APIs. Varios Microsoft specific extensions to their C++ compiler allows one to do the same (I'm thinking of both the COM extentions as wells as the managed extensions). I don't believe g++ supports either of these. Does anyone have some sample code that will read a g++ .o file (that was compiled with the debug option turned on), or a g++ executable image and extract the meta data about a type so I can enumerate the datamembers? have a look at the objdump(1) sources which reads symbols from gcc generated object files. but i don't think you will be able to get the information that you need from the object files, as these linker input files do not necessarily contain the original C++ object layout in processable form. you will need C++ parser output to get full identifier information for C++ source files. if you don't want to use a full-blown C++ parser implementation, for example the wrapper/interface generator tool swig has a mode to output a XML or lisp s-expression formatted abstract syntax tree for given source files. this gives you parseable data to further work with. see http://www.swig.org -- peter Back to top Roland Pibinger Guest Posted: Sun Nov 27, 2005 11:10 am    Post subject: Re: How to implement reflection in C++ On 27 Nov 2005 01:51:05 -0800, "peter steiner" <pnsteiner (AT) gmail (DOT) com> wrote: Quote: Siegfried wrote: Does anyone have some sample code that will read a g++ .o file (that was compiled with the debug option turned on), or a g++ executable image and extract the meta data about a type so I can enumerate the datamembers? have a look at the objdump(1) sources which reads symbols from gcc generated object files. or nm (http://www.gnu.org/software/binutils/manual/html_chapter/binutils_2.html) on Unix or dumpbin for VC++. Best wishes, Roland Pibinger Back to top Julián Albo Guest Posted: Sun Nov 27, 2005 12:00 pm    Post subject: Re: How to implement reflection in C++ Siegfried wrote: Quote: I don't believe g++ supports either of these. Does anyone have some sample code that will read a g++ .o file (that was compiled with the debug option turned on), or a g++ executable image and extract the meta data about a type so I can enumerate the datamembers? Supposing that you find or write such a tool, you must consider that the member functions of a class can be spawned over several .o files. -- Salu2 Back to top Gianni Mariani Guest Posted: Sun Nov 27, 2005 7:06 pm    Post subject: Re: How to implement reflection in C++ Siegfried wrote: Quote: Java, C# and other languages allow one to enumerate all the data members of a class or struct thru their respective reflection APIs. Varios Microsoft specific extensions to their C++ compiler allows one to do the same (I'm thinking of both the COM extentions as wells as the managed extensions). I don't believe g++ supports either of these. Does anyone have some sample code that will read a g++ .o file (that was compiled with the debug option turned on), or a g++ executable image and extract the meta data about a type so I can enumerate the datamembers? Go ask the gcc people. It's not standard C++ (I wish it was too) so it's off topic here. Back to top WaRCHieFX Guest Posted: Mon Nov 28, 2005 2:37 pm    Post subject: Re: How to implement reflection in C++ Take a look at the RTTI chapter in Thinking in C++ ([url]www.bruceeckel.com)[/url], i don't remember which volume. Back to top Ira Baxter Guest Posted: Wed Dec 07, 2005 3:35 am    Post subject: Re: How to implement reflection in C++ "peter steiner" <pnsteiner (AT) gmail (DOT) com> wrote Quote: Siegfried wrote: Java, C# and other languages allow one to enumerate all the data members of a class or struct thru their respective reflection APIs. I don't believe g++ supports either of these. Does anyone have some sample code that will read a g++ .o file (that was compiled with the debug option turned on), or a g++ executable image and extract the meta data about a type so I can enumerate the datamembers? you will need C++ parser output to get full identifier information for C++ source files. A front end C++ parser that can be straightforwardly configure to do this can be seen at www.semanticdesigns.com/Products/FrontEnds/CppFrontEnd It handles full GCC. -- Ira D. Baxter, Ph.D., CTO 512-250-1018 Semantic Designs, Inc. www.semdesigns.com Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.