[lldb-dev] Editline Rewrite : issues surround wide character handling on different platforms

[Enrico Granata]

> On Oct 29, 2014, at 10:59 AM, jingham at apple.com wrote:
> 
> 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.
> 

It’s called “pretty printers” (but they do both summaries & synthetic children): https://sourceware.org/gdb/current/onlinedocs/gdb/Pretty-Printing-API.html#Pretty-Printing-API

> 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.
> 
> Jim
> 
> 
>> On Oct 29, 2014, at 10:44 AM, Siva Chandra <sivachandra at google.com> wrote:
>> 
>> On Wed, Oct 29, 2014 at 10:33 AM,  <jingham at apple.com> wrote:
>>> And for instance, if we ever get good support for modules in C++,
>>> we could presumably then use that to do things like instantiate template
>>> classes for types that weren't instantiated in the current program, and
>>> other cool'o things like that which would be hard to do with some
>>> hand-built C++ parser, a la gdb.
>> 
>> GDB's solution for such cases currently is XMethods:
>> https://sourceware.org/gdb/current/onlinedocs/gdb/Xmethods-In-Python.html
>> 
>> There are a bunch of XMethods available for container classes in
>> libstdc++: https://gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/python/libstdcxx/v6/xmethods.py
> 
> 
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Thanks,
- Enrico
📩 egranata@.com ☎️ 27683




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