2fbd254aa4
Summary: Now in libcxx and clang, all the coroutine components are defined in std::experimental namespace. And now the coroutine TS is merged into C++20. So in the working draft like N4892, we could find the coroutine components is defined in std namespace instead of std::experimental namespace. And the coroutine support in clang seems to be relatively stable. So I think it may be suitable to move the coroutine component into the experiment namespace now. But move the coroutine component into the std namespace may be an break change. So I planned to split this change into two patch. One in clang and other in libcxx. This patch would make clang lookup coroutine_traits in std namespace first. For the compatibility consideration, clang would lookup in std::experimental namespace if it can't find definitions in std namespace and emit a warning in this case. So the existing codes wouldn't be break after update compiler. Test Plan: check-clang, check-libcxx Reviewed By: lxfind Differential Revision: https://reviews.llvm.org/D108696
52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
// This test merely verifies that emitting the object file does not cause a
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// crash when the LLVM coroutines passes are run.
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// PR42867: Disable this test for the new PM since the passes that lower the
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// llvm.coro.* intrinsics have not yet been ported.
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// RUN: %clang_cc1 -fno-experimental-new-pass-manager -emit-obj -std=c++2a -fsanitize=null %s -o %t.o
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namespace std {
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template <typename R, typename... T> struct coroutine_traits {
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using promise_type = typename R::promise_type;
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};
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template <class Promise = void> struct coroutine_handle;
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template <> struct coroutine_handle<void> {
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static coroutine_handle from_address(void *) noexcept;
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coroutine_handle() = default;
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template <class PromiseType>
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coroutine_handle(coroutine_handle<PromiseType>) noexcept;
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};
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template <class Promise> struct coroutine_handle : coroutine_handle<void> {
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coroutine_handle() = default;
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static coroutine_handle from_address(void *) noexcept;
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};
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} // namespace std
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struct suspend_always {
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bool await_ready() noexcept;
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void await_suspend(std::coroutine_handle<>) noexcept;
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void await_resume() noexcept;
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};
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struct task {
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struct promise_type {
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task get_return_object() { return task(); }
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suspend_always initial_suspend() { return {}; }
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suspend_always final_suspend() noexcept { return {}; }
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void return_void() {}
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void unhandled_exception() {}
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};
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};
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struct awaitable {
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task await() { (void)co_await *this; }
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bool await_ready() { return false; }
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bool await_suspend(std::coroutine_handle<> awaiter) { return false; }
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bool await_resume() { return false; }
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};
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int main() {
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awaitable a;
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a.await();
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}
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