[clang] [win][clang] Align scalar deleting destructors with MSABI (PR #139566)

[Mariya Podchishchaeva via cfe-commits]

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@@ -1587,28 +1587,82 @@ namespace {
     }
   };
 
+  // This function implements generation of scalar deleting destructor body for
+  // the case when the destructor also accepts an implicit flag. Right now only
+  // Microsoft ABI requires deleting destructors to accept implicit flags.
+  // The flag indicates whether an operator delete should be called and whether
+  // it should be a class-specific operator delete or a global one.
   void EmitConditionalDtorDeleteCall(CodeGenFunction &CGF,
                                      llvm::Value *ShouldDeleteCondition,
                                      bool ReturnAfterDelete) {
+    const CXXDestructorDecl *Dtor = cast<CXXDestructorDecl>(CGF.CurCodeDecl);
+    const CXXRecordDecl *ClassDecl = Dtor->getParent();
+    const FunctionDecl *OD = Dtor->getOperatorDelete();
+    assert(OD->isDestroyingOperatorDelete() == ReturnAfterDelete &&
+           "unexpected value for ReturnAfterDelete");
+    auto *CondTy = cast<llvm::IntegerType>(ShouldDeleteCondition->getType());
+    // Clang 20 calls global operator delete after dtor call. Clang 21 and newer
+    // call global operator delete inside of dtor body, as MSVC does.
+    bool Clang21AndNewer = CGF.getContext().getLangOpts().getClangABICompat() >
+                           LangOptions::ClangABI::Ver20;
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Fznamznon wrote:

Ok, I added a member to `TargetInfo` which seems to be easily available in both Sema and CodeGen. Thanks.

https://github.com/llvm/llvm-project/pull/139566