[PATCH] D92808: [ObjC][ARC] Annotate calls with attributes instead of emitting retainRV or claimRV calls in the IR

[Akira Hatanaka via Phabricator via llvm-commits]

ahatanak added a comment.

ToT clang/llvm (without this patch) is turning the call to `@objc_unsafeClaimAutoreleasedReturnValue` in the EH cleanup block into an unreachable when compiling the following code. It looks like this happens because the inliner isn't adding the funclet token, but it's not clear to me whether this is a bug or not.

$ cat test.mm

  void foo();
  id noexcept_func() noexcept;
  
  struct S0 {
    id x;
    ~S0() {
      noexcept_func();
    }
  };
  
  void test_attr_claimRV() {
    S0 s0;
    foo();
  }

$ clang++ -std=c++11 -fobjc-arc  test.mm -O3 -S -o - "-fobjc-runtime=ios-11.0.0" -target aarch64-unknown-windows-msvc


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