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
72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin9 %s -std=c++14 -fcoroutines-ts -fsyntax-only -Wignored-qualifiers -Wno-error=return-type -verify -fblocks -Wno-unreachable-code -Wno-unused-value
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#ifndef STD_COROUTINE_H
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#define STD_COROUTINE_H
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namespace std {
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template <typename R, typename...> struct coroutine_traits {
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using promise_type = typename R::promise_type;
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};
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template <typename Promise = void> struct coroutine_handle;
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template <> struct coroutine_handle<void> {
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static coroutine_handle from_address(void *addr) noexcept {
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coroutine_handle me;
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me.ptr = addr;
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return me;
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}
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void operator()() { resume(); }
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void *address() const noexcept { return ptr; }
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void resume() const { __builtin_coro_resume(ptr); }
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void destroy() const { __builtin_coro_destroy(ptr); }
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bool done() const { return __builtin_coro_done(ptr); }
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coroutine_handle &operator=(decltype(nullptr)) {
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ptr = nullptr;
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return *this;
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}
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coroutine_handle(decltype(nullptr)) : ptr(nullptr) {}
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coroutine_handle() : ptr(nullptr) {}
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// void reset() { ptr = nullptr; } // add to P0057?
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explicit operator bool() const { return ptr; }
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protected:
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void *ptr;
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};
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template <typename Promise> struct coroutine_handle : coroutine_handle<> {
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using coroutine_handle<>::operator=;
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static coroutine_handle from_address(void *addr) noexcept {
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coroutine_handle me;
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me.ptr = addr;
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return me;
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}
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Promise &promise() const {
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return *reinterpret_cast<Promise *>(
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__builtin_coro_promise(ptr, alignof(Promise), false));
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}
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static coroutine_handle from_promise(Promise &promise) {
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coroutine_handle p;
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p.ptr = __builtin_coro_promise(&promise, alignof(Promise), true);
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return p;
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}
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};
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struct suspend_always {
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bool await_ready() { return false; }
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void await_suspend(coroutine_handle<>) {}
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void await_resume() {}
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};
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struct suspend_never {
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bool await_ready() noexcept { return true; }
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void await_suspend(coroutine_handle<>) noexcept {}
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void await_resume() noexcept {}
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};
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} // namespace std
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#endif // STD_COROUTINE_H
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