We stopped marking `__lldb_expr` with the function qualifiers of the
method LLDB is stopped in ever since
`8bdcd522510f923185cdfaec66c4a78d0a0d38c0`. The assumption was that it
wasn't ever required for correctness (i.e., LLDB should just always
pretend it's in a mutable context). But since function qualifiers affect
overloading in C++, this assumption can lead to unexpected expression
evaluator behaviour. E.g., if a function is overloaded on qualifiers
(`const` vs. `non-const`), the expression evaluator would currently
always call the non-CV qualified overload.
This patch adds function qualifiers to `$__lldb_class::$__lldb_expr`
that resemble the qualifiers of the method that we're stopped in.
However, mutating variables or calling arbitrary member functions from
CV-qualified methods can be useful/is something users already may be
used to. To provide users with the ability to ignore the CV-qualifiers
of the current context, we will provide an expression evaluator flag
that switches this off in a follow-up patch.
This is an ongoing series of commits that are reformatting our Python
code. Reformatting is done with `black` (23.1.0).
If you end up having problems merging this commit because you have made
changes to a python file, the best way to handle that is to run `git
checkout --ours <yourfile>` and then reformat it with black.
RFC: https://discourse.llvm.org/t/rfc-document-and-standardize-python-code-style
Differential revision: https://reviews.llvm.org/D151460
This patch adds support for evaluating expressions which reference
a captured `this` from within the context of a C++ lambda expression.
Currently LLDB doesn't provide Clang with enough information to
determine that we're inside a lambda expression and are allowed to
access variables on a captured `this`; instead Clang simply fails
to parse the expression.
There are two problems to solve here:
1. Make sure `clang::Sema` doesn't reject the expression due to an
illegal member access.
2. Materialize all the captured variables/member variables required
to evaluate the expression.
To address (1), we currently import the outer structure's AST context
onto `$__lldb_class`, making the `contextClass` and the `NamingClass`
match, a requirement by `clang::Sema::BuildPossibleImplicitMemberExpr`.
To address (2), we inject all captured variables as locals into the
expression source code.
**Testing**
* Added API test
