coro-return.cpp
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcoroutines-ts -std=c++1z -emit-llvm %s -o - -disable-llvm-passes | FileCheck %s
namespace std::experimental {
template <typename... T> struct coroutine_traits;
template <class Promise = void> struct coroutine_handle {
coroutine_handle() = default;
static coroutine_handle from_address(void *) noexcept { return {}; }
};
template <> struct coroutine_handle<void> {
static coroutine_handle from_address(void *) { return {}; }
coroutine_handle() = default;
template <class PromiseType>
coroutine_handle(coroutine_handle<PromiseType>) noexcept {}
};
}
struct suspend_always {
bool await_ready() noexcept;
void await_suspend(std::experimental::coroutine_handle<>) noexcept;
void await_resume() noexcept;
};
template <> struct std::experimental::coroutine_traits<void> {
struct promise_type {
void get_return_object();
suspend_always initial_suspend();
suspend_always final_suspend() noexcept;
void return_void();
};
};
// CHECK-LABEL: f0(
extern "C" void f0() {
// CHECK: %__promise = alloca %"struct.std::experimental::coroutine_traits<void>::promise_type"
// CHECK: %call = call noalias nonnull i8* @_Znwm(
// CHECK: call void @_ZNSt12experimental16coroutine_traitsIJvEE12promise_type11return_voidEv(%"struct.std::experimental::coroutine_traits<void>::promise_type"* %__promise)
// CHECK: call void @_ZdlPv
co_return;
}
template<>
struct std::experimental::coroutine_traits<int> {
struct promise_type {
int get_return_object();
suspend_always initial_suspend();
suspend_always final_suspend() noexcept;
void return_value(int);
};
};
// CHECK-LABEL: f1(
extern "C" int f1() {
// CHECK: %__promise = alloca %"struct.std::experimental::coroutine_traits<int>::promise_type"
// CHECK: %call = call noalias nonnull i8* @_Znwm(
// CHECK: call void @_ZNSt12experimental16coroutine_traitsIJiEE12promise_type12return_valueEi(%"struct.std::experimental::coroutine_traits<int>::promise_type"* %__promise, i32 42)
// CHECK: call void @_ZdlPv
co_return 42;
}