[PATCH] D56587: Fix sign/zero extension in Dwarf expressions.

[Adrian Prantl via Phabricator via llvm-commits]

aprantl added a comment.

In D56587#1390564 <https://reviews.llvm.org/D56587#1390564>, @dstenb wrote:

> How should `DW_OP_convert` be handled when targeting DWARF versions earlier than 5? There is the GNU extension `DW_OP_GNU_convert`, which GDB seems to have had support for since 2011. The operation seems to be the identical to the final version that got into DWARFv5, so LLDB should be able to handle the two variants transparently. Can we emit that GNU extension (under some limitations)?


That seems fine for debugger-tuning=gdb (and eventually lldb once we implemented support for it). Is emitting the byzantine shift/mask expression that this review started with in all other cases an option for a reasonably large subset of the uses?


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