[Lldb-commits] [PATCH] D40475: DWZ 12/12: DWZ test mode

Jan Kratochvil via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Thu Nov 30 12:17:49 PST 2017

jankratochvil added a comment.

In https://reviews.llvm.org/D40475#940462, @labath wrote:

> It looks like it could be a fun project to reimplement `dwz` on top of llvm dwarf library, but I understand that would be a considerable detour for you.

I think it would be best to drop DWZ, IIRC its gain is not much bigger than `-fdebug-types-section` and it is incompatible with some 3rd party debug info tools as DWZ did not really became a standard.  I just want to make LLDB compatible with it.

> How many tests are we talking about here? Could you list them here?

These tests ERROR due to `dwz: a.out.debug.dwz: .debug_info section not present`:


> If these really don't produce any debug info, then we can probably just mark them as `@no_debug_info_testcase`

I do not see this keyword in the tree.

> Looking at the results, they don't seem that bad, really. Most of the failures are in data formatters -- I think a well-placed `-fno-limit-debug-info` would get those working. The other category is something in the system library confusing the test (e.g. can't find `environ` or an extra global variable `c`). I think we could get those resolved fairly quickly.
> BTW, is this on current master? I was hoping that some of these (such as TestTopLevelExpressions) would be resolved already.

No, it was from 26th.  I have refreshed the files with today's GIT hash `6513119854292f1992c95073e99d55bf88456adb` = SVN `319402`.

> It would also be useful to figure out why does it hang, as it will probably affect your users as well. :)

I expect because LLDB does not have any Linux DWARF index support, it has only some Apple OSX index support. GDB's `.debug_index` is not usable for LLDB as it does not contain DIE offsets. I would like to implement DWARF-5 `.debug_names` for it later.


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