[all-commits] [llvm/llvm-project] eec98b: [LLDB] Add formatters for MSVC STL std::tuple (#14...

[nerix via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: eec98bef84b8a68533d9176468c1d2010f26717f
      https://github.com/llvm/llvm-project/commit/eec98bef84b8a68533d9176468c1d2010f26717f
  Author: nerix <nerixdev at outlook.de>
  Date:   2025-07-15 (Tue, 15 Jul 2025)

  Changed paths:
    M lldb/source/Plugins/Language/CPlusPlus/CMakeLists.txt
    M lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
    M lldb/source/Plugins/Language/CPlusPlus/MsvcStl.h
    A lldb/source/Plugins/Language/CPlusPlus/MsvcStlTuple.cpp
    M lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/tuple/TestDataFormatterStdTuple.py
    M lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/tuple/main.cpp

  Log Message:
  -----------
  [LLDB] Add formatters for MSVC STL std::tuple (#148548)

Adds synthetic children for MSVC STL's
[`std::tuple`](https://github.com/microsoft/STL/blob/313964b78a8fd5a52e7965e13781f735bcce13c5/stl/inc/tuple).
A `tuple` is a chain of base classes:
```cpp
template <>
class tuple<> {};

template <class _This, class... _Rest>
class tuple<_This, _Rest...> : private tuple<_Rest...> {
  _Tuple_val<_This> _Myfirst;
};
```

So the provider walks the base classes to the desired one.

The implementation makes it hard to detect if the empty tuple is from
this STL. Fortunately, libstdc++'s synthetic children provider works for
empty MSVC STL tuples as well.

Towards #24834.



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