[all-commits] [llvm/llvm-project] 0301a4: [lldb][Language] Add more language types

[Michael Buch via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0301a492f43efc3a2c1fa1bddd16e46aac8ab77e
      https://github.com/llvm/llvm-project/commit/0301a492f43efc3a2c1fa1bddd16e46aac8ab77e
  Author: Michael Buch <michaelbuch12 at gmail.com>
  Date:   2023-04-14 (Fri, 14 Apr 2023)

  Changed paths:
    M lldb/include/lldb/lldb-enumerations.h
    M lldb/source/Target/Language.cpp

  Log Message:
  -----------
  [lldb][Language] Add more language types

Adds more languages to the `language_names` list in
preparation for adding support for C++20 expression
evaluation.

The language constants were taken from the DWARFv5
constants defined in LLVM's `Dwarf.def`. Two vendor
constants overlap with the DWARFv5 constants so bump
their values. Their actual value is not important,
whereas keeping the enum values consecutive is (since
they are used for array lookups).

Differential Revision: https://reviews.llvm.org/D143061


  Commit: 89cd0e8c267f57004a734c94ff15c6bd0facf646
      https://github.com/llvm/llvm-project/commit/89cd0e8c267f57004a734c94ff15c6bd0facf646
  Author: Michael Buch <michaelbuch12 at gmail.com>
  Date:   2023-04-14 (Fri, 14 Apr 2023)

  Changed paths:
    M lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
    M lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionSourceCode.cpp
    M lldb/source/Plugins/Language/CPlusPlus/CPlusPlusNameParser.cpp
    M lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
    M lldb/source/Target/Language.cpp
    A lldb/test/API/lang/cpp/standards/cpp20/Makefile
    A lldb/test/API/lang/cpp/standards/cpp20/TestCPP20Standard.py
    A lldb/test/API/lang/cpp/standards/cpp20/main.cpp
    M lldb/unittests/Language/CPlusPlus/CPlusPlusLanguageTest.cpp

  Log Message:
  -----------
  [lldb] Allow evaluating expressions in C++20 mode

This patch allows users to evaluate expressions using
`expr -l c++20`. Currently DWARF keeps the CU's at
`DW_AT_language` at `DW_LANG_C_plus_plus_14` even
when compiling with `-std=c++20`. So even in "C++20
programs" expression evaluation will by default be
performed in `C++11` mode for now.

Enabling `C++14` has been previously attempted at
https://reviews.llvm.org/D80308

There are some remaining issues around evaluating C++20
expressions. Mainly, lack of support for C++20 AST nodes in
`clang::ASTImporter`. But these can be addressed in follow-up
patches.


Compare: https://github.com/llvm/llvm-project/compare/7dbf5ce538bc...89cd0e8c267f