Hi Lyle, Thanks for the information on LD_PRELOAD. I had posted this query in this mailing-list because I thought if there are some instrumentation options that gcc provides which could be useful for function replacement. Regards, -Shriram. | -----Original Message----- | From: lrtaylor@xxxxxxxxxx [mailto:lrtaylor@xxxxxxxxxx] | Sent: Wednesday, July 07, 2004 1:35 AM | To: shriram_vishwanathan@xxxxxxxxxxxxxxxx; gcc-help@xxxxxxxxxxx | Subject: RE: Debugging C++ using instrumentation. | | | Unfortunately, I can't give you much information, but I | believe this is | possible (at least on UNIX/Linux). I've seen something | similar done for | memory profilers (malloc and free would be overridden by | custom versions | in a shared library). The way it worked more or less (as | near as I can | remember anyway) is that there were special versions of functions that | were to be overridden in a shared library, and the runtime linker was | told to load this library before any others using (maybe) the | LD_PRELOAD | variable or something like that. That way, the function calls would | resolve to those defined in this special library. | | Unfortunately, I don't remember much beyond that, and I could be | remembering things wrong. However, the important point is that I | believe you can in fact override functions at runtime. | However, this is | not going to be the forum to get a complete answer, since I believe it | has nothing to do with the compiler, but rather with the | runtime linker. | You might try a binutils list or something similar. Also look at the | man page for "ld.so". | | Good luck, | Lyle | | | -----Original Message----- | From: gcc-help-owner@xxxxxxxxxxx | [mailto:gcc-help-owner@xxxxxxxxxxx] On | Behalf Of Shriram V | Sent: Monday, July 05, 2004 7:14 AM | To: gcc-help@xxxxxxxxxxx | Subject: Debugging C++ using instrumentation. | | Hi Gurus, | | I was wondering if there is a method that allows a call to an | arbitrary | function to be intercepted and replaced by a new function at runtime / | compile-time / link-time. | <SNIP> |
