clang_delta segfault

[vient]

Hi, I'm using cvise from Ubuntu 24.10 repos. Tried to reduce a GCC ICE, all ClangDelta passes reported segfaults, all Clang passes reported "non-fatal errors", so here is a reduced test which crashes clang_delta:

template<class>
struct a {
  struct {
    struct b c;
  } static g;
  void* d = g;
  constexpr a() {
  }
  using e = a<b>;
  e f() {
    e();
  }
};

note that the code does not crash Clang 19.1

---

Found this info in cvise_bug folder

Package: cvise 2.10.0
Git version: unknown
LLVM version: 19.1.0
System: uname_result(system='Linux', node='8bd18241cab4', release='5.15.0-117-generic', version='#127~20.04.1-Ubuntu SMP Thu Jul 11 15:36:12 UTC 2024', machine='x86_64')
***************************************************

ClangPass::remove-nested-function has encountered a bug:
pass error
state: 1

and my interestingness test

#!/bin/bash
timeout 10 /usr/lib/cvise/clang_delta --query-instances=simple-inliner --std=c++2b test.cpp
exit $(($?-139))

[vient]

Another reduction, this time can be compiled https://godbolt.org/z/WKqG3xY69 Doubt that it was needed but just in case

class a;

namespace std {
  template<typename...>
  struct coroutine_traits;

  template<typename = void>
  struct coroutine_handle {
    static coroutine_handle from_address(void*);
    operator coroutine_handle<>();
  };
}  // namespace std

struct b {
  bool await_ready() noexcept;
  void await_suspend(std::coroutine_handle<>) noexcept;
  void await_resume() noexcept;
};

template<typename, typename>
class c;

template<typename dg, typename d>
class awaitable {
public:
  bool await_ready();
  template<class e>
  void await_suspend(std::coroutine_handle<c<e, d>>);
  dg await_resume();
};

template<typename>
class f {
public:
  auto initial_suspend() {
    return b();
  }
  auto final_suspend() noexcept {
    return b{};
  }
  void unhandled_exception();
};

template<typename dg, typename d>
class c : public f<d> {
public:
  awaitable<dg, d> get_return_object();
};

namespace std {
  template<typename dg, typename d, typename... g>
  struct coroutine_traits<awaitable<dg, d>, g...> {
    using promise_type = c<dg, d>;
  };
}  // namespace std

awaitable<int, a> h() {
  co_await h();
}

#!/bin/bash
clang++-19 -c common_cvise.cpp -o /dev/null -std=c++23 || exit 1
/usr/lib/cvise/clang_delta --query-instances=simple-inliner --std=c++2b common_cvise.cpp
exit $(($?-139))

[marxin]

Hey, thanks for the report. Unfortunatelly, the project is seeking for a maintainer and I won't be able to make any further development of the project. Thanks for understanding. You might be lucky and get a feedback from the original C-Reduce project which shared the clang_delta core.