Michael137 wrote:
This is quite an interesting case. Basically the issue arises only because we
have an `anonymous` struct in `B` with a base class that has an "indirect
field" called `x`:
```
IndirectFieldDecl 0x104145868 <<invalid sloc>> <invalid sloc> implicit x 'int'
|-Field 0x104145758 '' 'A::(anonymous struct)'
`-Field 0x104145700 'x' 'int'
```
It's important that the nested structure in `B` is `anonymous` (not `unnamed`)
because that's what [causes us to
recurse](https://github.com/llvm/llvm-project/blob/cf47898453c83c977f92155c03e9cf205bfb2b19/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp#L6755)).
Clang creates a `FieldDecl` with an empty name for that anonymous structure.
The lookup into base class `A` for name `x` works fine from Clang's
perspective. But then we try to `GetIndexForRecordChild` to find the index of
`x` in `A`, but that fails [because `RecordDecl::field_begin` doesn't iterate
over
`IndirectFieldDecl`s](https://github.com/llvm/llvm-project/blob/cf47898453c83c977f92155c03e9cf205bfb2b19/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp#L6688).
So even if we fix the crash, we still wouldn't be able to access `x`. I think
we can address that separately from the crash, but I think we should not be
clearing the vector in `TypeSystemClang::GetIndexofChildMemberWithName` and
instead propagate errors properly.
Separately (outside the scope of this PR) we should make
`GetIndexForRecordChild` account for fields of anonymous structures. E.g., we
might want to do another lookup for `x` into the anonymous structure.
https://github.com/llvm/llvm-project/pull/117808
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