Debugging info

[manu-st]

I'm looking at how to debug a native program using gdb/lldb. On AMD64, you can actually step into the source code of managed code. However it does not seem possible to list all locals and arguments. From what I can gather, the debugging info seems to be generated by RyuJit, does it means that for the non-C++ backends, it will rely on RyuJit for debug info and that therefore any improvements on this topic should be done in CoreCLR?

[jkotas]

RyuJIT has everything required for this. It generates IL->native map for both code and local variables.

The missing parts are in CoreRT and ObjectWriter (that lives in llilc repo). Merge the source code -> IL map and IL->native map and write the result as PDB or DWARF.

The implementation of the local var debug info was started in #794. It works for some limited cases, but it is not finished. Tracked by set of issues: https://github.com/dotnet/corert/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+label%3ACodeGen+DebugInfo

[MichalStrehovsky]

Tracked in e.g. #783, #785.