Hi all, I have occasionally found -finstrument-functions very useful in tracking performance issues. However, it is a very broad brush to use, and without lots of judicious exclusions tends to be unwieldy. In my use case I'd ideally want an inclusion-based approach and having seen the relevant code (in gimplify.c), it would seem fairly straightforward to do. However, I'd prefer to spike out this functionality as a gcc plugin. I have had a little experience with plugins before (hacking on the mozilla dehydra plugin), and I'm well aware of both the python plugin and Basile's MELT. My use case somewhat counts against introducing more complexity than needed, and ideally if it works out as a plugin, I'd like to fold anything useful back into the main GCC tree, so I'd like to do this in C. That being said, I'm finding it rather troublesome to find the right place to hook using the plugin system. The existing -finstrument-functions code hooks right at the end of gimplify_function_tree, and replaces the BIND gimple statement with a TRY_FINALLY block that does the instrumentation calls. I've attempted to hook a pass directly after the gimplification, but I can't seem to find and replace the BIND statement with a wrapped call in the same way the existing code does. Either the tree elements I'm checking have no GIMPLE associated with them, or I'm looking in the wrong place (most likely!). Can anyone offer any advice on how I might achieve this? I've read up a fair amount of the GCC innards documentation, and all of it makes sense, but I'm having trouble mapping this knowledge to this particular problem. Many thanks in advance, Matt -- Matt
