werat marked 6 inline comments as done.
werat added a comment.
In D81471#3632297 <https://reviews.llvm.org/D81471#3632297>, @labath wrote:
> I guess the condition we really want to express here is "does this expression
> refer to a constexpr variable (ideally one without a location)"? And the
> problem is that clang does not give us the means to detect that?
>
> Is that really the case? Would it maybe be possible to use some c++ magic to
> get clang to do that for us. Write something like `if constexpr
> (__builtin_constant_p(user_expression)) do_something_rvalue_like(); else
> assume_regular_lvalue();` ?
I think you're right here, but I don't know a better way to express this. My
clangfu is not good enough for this yet :)
As I understand it, we can't express it purely in the expression (via
`__builtin_constant_p` or something), because we need to know the answer before
executing the expression (it changes the way we do
materialization/dematerialization).
Could this be something to improve in the future?
================
Comment at: lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp:2689
+ // TODO: Support float/double static members as well.
+ if (!attrs.const_value_form && !ct.IsIntegerOrEnumerationType(unused))
+ return;
----------------
Michael137 wrote:
> Should this be:
>
> ```
> if (!attrs.const_value_form || !ct.IsIntegerOrEnumerationType(unused))
> ```
> ?
Whoops, yes, thanks!
================
Comment at: lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp:2696
+ "Failed to add const value to variable {1}: {0}",
+ v->getQualifiedNameAsString());
+ return;
----------------
Michael137 wrote:
> Can `v` be `nullptr` here?
Honestly, not sure. Theoretically `AddVariableToRecordType` can return
`nullptr`, but I've never seen such case. Maybe it only happens when the debug
info is malformed? Would that be caught earlier at some stage?
I can add a safe guard here with a log message.
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