<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Oct 29, 2014, at 10:59 AM, <a href="mailto:jingham@apple.com" class="">jingham@apple.com</a> wrote:</div><br class="Apple-interchange-newline"><div class="">I hadn't seen that. That looks pretty useful for things like reintroducing the "size" method for std::vectors that hold the size in an easily accessible field, or something else like that. It involves re-implementing the guts of the library you are patching up in Python using debugger API's so it isn't entirely straight-forward. Note we already do a similar sort of thing in the data formatters to produce nice summaries and "synthetic children" for std & Foundation types that can avoid running code. I think gdb also has some formatter infrastructure like this, IIRC, but I haven't used gdb much for a few years now.<br class=""><br class=""></div></blockquote><div><br class=""></div><div>It’s called “pretty printers” (but they do both summaries & synthetic children): <a href="https://sourceware.org/gdb/current/onlinedocs/gdb/Pretty-Printing-API.html#Pretty-Printing-API" class="">https://sourceware.org/gdb/current/onlinedocs/gdb/Pretty-Printing-API.html#Pretty-Printing-API</a></div><br class=""><blockquote type="cite" class=""><div class="">Anyway, you'd be hard pressed to use something like these Xmethods to do more science fiction'y things like "I wish that I had std::vector<T> around for some experiment I want to do in the debugger, but the program never used std::vector<T>, please make it for me". Not sure how often you'd really use that, but the point is that if we had the C++ modules around, we would get it pretty much for free.<br class=""><br class="">Jim<br class=""><br class=""><br class=""><blockquote type="cite" class="">On Oct 29, 2014, at 10:44 AM, Siva Chandra <<a href="mailto:sivachandra@google.com" class="">sivachandra@google.com</a>> wrote:<br class=""><br class="">On Wed, Oct 29, 2014 at 10:33 AM, <<a href="mailto:jingham@apple.com" class="">jingham@apple.com</a>> wrote:<br class=""><blockquote type="cite" class="">And for instance, if we ever get good support for modules in C++,<br class="">we could presumably then use that to do things like instantiate template<br class="">classes for types that weren't instantiated in the current program, and<br class="">other cool'o things like that which would be hard to do with some<br class="">hand-built C++ parser, a la gdb.<br class=""></blockquote><br class="">GDB's solution for such cases currently is XMethods:<br class=""><a href="https://sourceware.org/gdb/current/onlinedocs/gdb/Xmethods-In-Python.html" class="">https://sourceware.org/gdb/current/onlinedocs/gdb/Xmethods-In-Python.html</a><br class=""><br class="">There are a bunch of XMethods available for container classes in<br class="">libstdc++: https://gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/python/libstdcxx/v6/xmethods.py<br class=""></blockquote><br class=""><br class="">_______________________________________________<br class="">lldb-dev mailing list<br class=""><a href="mailto:lldb-dev@cs.uiuc.edu" class="">lldb-dev@cs.uiuc.edu</a><br class="">http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev<br class=""></div></blockquote></div><br class=""><div class="">
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