When resolving symbols during IR execution, lldb makes a last effort attempt
to resolve external symbols from object files by approximate name matching.
It currently uses CPlusPlusNameParser to parse the demangled function name
and arguments for the unresolved symbol and its candidates. However, this
hand-rolled C++ parser doesn’t support ABI tags which, depending on the demangler,
get demangled into [abi:tag]. This lack of parsing support causes lldb to never
consider a candidate mangled function name that has ABI tags.
The issue reproduces by calling an ABI-tagged template function from the
expression evaluator. This is particularly problematic with the recent
addition of ABI tags to numerous libcxx APIs.
This patch deals with the above symbol resolution issue by using the
Itanium mangle tree API to compare mangled function symbols and no
longer relying on parsing demangled names via CPlusPlusNameParser. Since
the MSVC mangler doesn't expose the mangle tree we continue using the
old matching logic when the candidate symbol has the MSVC mangling
- Added API tests