ec117158a3
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. 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. So the existing codes wouldn't be break after update compiler. And in case the compiler found std::coroutine_traits and std::experimental::coroutine_traits at the same time, it would emit an error for it. The support for looking up std::experimental::coroutine_traits would be removed in Clang16. Reviewed By: lxfind, Quuxplusone Differential Revision: https://reviews.llvm.org/D108696
53 lines
2.0 KiB
C++
53 lines
2.0 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm -fcoroutines-ts \
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// RUN: -fexperimental-new-pass-manager -O0 %s -o - | FileCheck %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm -fcoroutines-ts \
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// RUN: -fexperimental-new-pass-manager -fno-inline -O0 %s -o - | FileCheck %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm -fcoroutines-ts \
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// RUN: -O0 %s -o - | FileCheck %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm -fcoroutines-ts \
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// RUN: -fno-inline -O0 %s -o - | FileCheck %s
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namespace std {
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namespace experimental {
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struct handle {};
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struct awaitable {
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bool await_ready() noexcept { return true; }
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// CHECK-NOT: await_suspend
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inline void __attribute__((__always_inline__)) await_suspend(handle) noexcept {}
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bool await_resume() noexcept { return true; }
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};
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template <typename T>
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struct coroutine_handle {
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static handle from_address(void *address) noexcept { return {}; }
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};
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template <typename T = void>
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struct coroutine_traits {
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struct promise_type {
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awaitable initial_suspend() { return {}; }
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awaitable final_suspend() noexcept { return {}; }
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void return_void() {}
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T get_return_object() { return T(); }
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void unhandled_exception() {}
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};
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};
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} // namespace experimental
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} // namespace std
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// CHECK-LABEL: @_Z3foov
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// CHECK-LABEL: entry:
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// CHECK: [[CAST0:%[0-9]+]] = bitcast %"struct.std::experimental::awaitable"* %ref.tmp{{.*}} to i8*
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// CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* [[CAST0]])
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// CHECK: [[CAST1:%[0-9]+]] = bitcast %"struct.std::experimental::awaitable"* %ref.tmp{{.*}} to i8*
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// CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* [[CAST1]])
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// CHECK: [[CAST2:%[0-9]+]] = bitcast %"struct.std::experimental::awaitable"* %ref.tmp{{.*}} to i8*
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// CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* [[CAST2]])
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// CHECK: [[CAST3:%[0-9]+]] = bitcast %"struct.std::experimental::awaitable"* %ref.tmp{{.*}} to i8*
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// CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* [[CAST3]])
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void foo() { co_return; }
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