[all-commits] [llvm/llvm-project] 64b851: Reland [C++20] [Modules] [Itanium ABI] Generate th...

[Chuanqi Xu via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 64b8514e6c1a663660fbb93ec7f623b3e40a2020
      https://github.com/llvm/llvm-project/commit/64b8514e6c1a663660fbb93ec7f623b3e40a2020
  Author: Chuanqi Xu <yedeng.yd at linux.alibaba.com>
  Date:   2024-08-20 (Tue, 20 Aug 2024)

  Changed paths:
    M clang/include/clang/AST/DeclBase.h
    M clang/include/clang/Serialization/ASTBitCodes.h
    M clang/include/clang/Serialization/ASTReader.h
    M clang/include/clang/Serialization/ASTWriter.h
    M clang/lib/AST/ASTContext.cpp
    M clang/lib/AST/DeclBase.cpp
    M clang/lib/CodeGen/CGVTables.cpp
    M clang/lib/CodeGen/ItaniumCXXABI.cpp
    M clang/lib/Sema/SemaDecl.cpp
    M clang/lib/Sema/SemaDeclCXX.cpp
    M clang/lib/Serialization/ASTReader.cpp
    M clang/lib/Serialization/ASTReaderDecl.cpp
    M clang/lib/Serialization/ASTWriter.cpp
    M clang/lib/Serialization/ASTWriterDecl.cpp
    M clang/test/CodeGenCXX/modules-vtable.cppm
    A clang/test/CodeGenCXX/pr70585.cppm
    A clang/test/Modules/pr97313.cppm
    A clang/test/Modules/static-func-in-private.cppm
    A clang/test/Modules/vtable-windows.cppm

  Log Message:
  -----------
  Reland [C++20] [Modules] [Itanium ABI] Generate the vtable in the mod… (#102287)

Reland https://github.com/llvm/llvm-project/pull/75912

The differences of this PR between
https://github.com/llvm/llvm-project/pull/75912 are:

- Fixed a regression in `Decl::isInAnotherModuleUnit()` in DeclBase.cpp
pointed by @mizvekov and add the corresponding test.
- Fixed the regression in windows
https://github.com/llvm/llvm-project/issues/97447. The changes are in
`CodeGenModule::getVTableLinkage` from
`clang/lib/CodeGen/CGVTables.cpp`. According to the feedbacks from MSVC
devs, the linkage of vtables won't affected by modules. So I simply
skipped the case for MSVC.

Given this is more or less fundamental to the use of modules. I hope we
can backport this to 19.x.

(cherry picked from commit 847f9cb0e868c8ec34f9aa86fdf846f8c4e0388b)



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