[Lldb-commits] [PATCH] D86311: Fix how ValueObjectVariable handles DW_AT_const_value when the DWARFExpression holds the data that represents a constant value

Shafik Yaghmour via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Thu Aug 20 11:22:50 PDT 2020

shafik created this revision.
shafik added reviewers: aprantl, friss, labath, jingham, vsk.
shafik requested review of this revision.
Herald added a reviewer: jdoerfert.
Herald added a subscriber: sstefan1.

In some cases when we have a `DW_AT_const_value` and the data can be found in the `DWARFExpression` then `ValueObjectVariable` does not handle it properly and we end up with an `extracting data from value failed` error:

  (lldb) target var constant
  (U) constant = {
    raw = <extracting data from value failed>
     = (a = <extracting data from value failed>, b = <extracting data from value failed>, c = <extracting data from value failed>, d = <extracting data from value failed>, e = <extracting data from value failed>, f = <extracting data from value failed>)

This should fix that case.

The test is a very stripped down assembly file since reproducing this relies on the results of compiling with `-O1` which may not be stable over time.



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