329 lines
12 KiB
C++
329 lines
12 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcoroutines-ts -std=c++14 \
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// RUN: -emit-llvm %s -o - -disable-llvm-passes -Wno-coroutine -Wno-unused | FileCheck %s
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namespace std {
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namespace experimental {
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template <typename... T>
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struct coroutine_traits;
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template <typename Promise = void> struct coroutine_handle;
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template <>
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struct coroutine_handle<void> {
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void *ptr;
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static coroutine_handle from_address(void *);
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};
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template <typename Promise>
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struct coroutine_handle : coroutine_handle<> {
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static coroutine_handle from_address(void *);
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};
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}
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}
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struct init_susp {
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bool await_ready();
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void await_suspend(std::experimental::coroutine_handle<>);
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void await_resume();
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};
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struct final_susp {
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bool await_ready();
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void await_suspend(std::experimental::coroutine_handle<>);
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void await_resume();
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};
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struct suspend_always {
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int stuff;
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bool await_ready();
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void await_suspend(std::experimental::coroutine_handle<>);
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void await_resume();
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};
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template<>
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struct std::experimental::coroutine_traits<void> {
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struct promise_type {
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void get_return_object();
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init_susp initial_suspend();
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final_susp final_suspend();
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void return_void();
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};
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};
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// CHECK-LABEL: f0(
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extern "C" void f0() {
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// CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.begin(
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// See if initial_suspend was issued:
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// ----------------------------------
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// CHECK: call void @_ZNSt12experimental16coroutine_traitsIJvEE12promise_type15initial_suspendEv(
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// CHECK-NEXT: call zeroext i1 @_ZN9init_susp11await_readyEv(%struct.init_susp*
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// CHECK: %[[INITSP_ID:.+]] = call token @llvm.coro.save(
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// CHECK: call i8 @llvm.coro.suspend(token %[[INITSP_ID]], i1 false)
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co_await suspend_always{};
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// See if we need to suspend:
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// --------------------------
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// CHECK: %[[READY:.+]] = call zeroext i1 @_ZN14suspend_always11await_readyEv(%struct.suspend_always* %[[AWAITABLE:.+]])
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// CHECK: br i1 %[[READY]], label %[[READY_BB:.+]], label %[[SUSPEND_BB:.+]]
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// If we are suspending:
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// ---------------------
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// CHECK: [[SUSPEND_BB]]:
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// CHECK: %[[SUSPEND_ID:.+]] = call token @llvm.coro.save(
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// ---------------------------
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// Build the coroutine handle and pass it to await_suspend
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// ---------------------------
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// CHECK: call i8* @_ZNSt12experimental16coroutine_handleINS_16coroutine_traitsIJvEE12promise_typeEE12from_addressEPv(i8* %[[FRAME]])
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// ... many lines of code to coerce coroutine_handle into an i8* scalar
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// CHECK: %[[CH:.+]] = load i8*, i8** %{{.+}}
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// CHECK: call void @_ZN14suspend_always13await_suspendENSt12experimental16coroutine_handleIvEE(%struct.suspend_always* %[[AWAITABLE]], i8* %[[CH]])
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// -------------------------
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// Generate a suspend point:
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// -------------------------
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// CHECK: %[[OUTCOME:.+]] = call i8 @llvm.coro.suspend(token %[[SUSPEND_ID]], i1 false)
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// CHECK: switch i8 %[[OUTCOME]], label %[[RET_BB:.+]] [
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// CHECK: i8 0, label %[[READY_BB]]
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// CHECK: i8 1, label %[[CLEANUP_BB:.+]]
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// CHECK: ]
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// Cleanup code goes here:
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// -----------------------
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// CHECK: [[CLEANUP_BB]]:
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// When coroutine is resumed, call await_resume
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// --------------------------
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// CHECK: [[READY_BB]]:
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// CHECK: call void @_ZN14suspend_always12await_resumeEv(%struct.suspend_always* %[[AWAITABLE]])
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// See if final_suspend was issued:
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// ----------------------------------
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// CHECK: call void @_ZNSt12experimental16coroutine_traitsIJvEE12promise_type13final_suspendEv(
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// CHECK-NEXT: call zeroext i1 @_ZN10final_susp11await_readyEv(%struct.final_susp*
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// CHECK: %[[FINALSP_ID:.+]] = call token @llvm.coro.save(
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// CHECK: call i8 @llvm.coro.suspend(token %[[FINALSP_ID]], i1 true)
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}
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struct suspend_maybe {
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float stuff;
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~suspend_maybe();
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bool await_ready();
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bool await_suspend(std::experimental::coroutine_handle<>);
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void await_resume();
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};
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template<>
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struct std::experimental::coroutine_traits<void,int> {
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struct promise_type {
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void get_return_object();
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init_susp initial_suspend();
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final_susp final_suspend();
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void return_void();
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suspend_maybe yield_value(int);
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};
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};
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// CHECK-LABEL: f1(
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extern "C" void f1(int) {
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// CHECK: %[[PROMISE:.+]] = alloca %"struct.std::experimental::coroutine_traits<void, int>::promise_type"
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// CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.begin(
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co_yield 42;
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// CHECK: call void @_ZNSt12experimental16coroutine_traitsIJviEE12promise_type11yield_valueEi(%struct.suspend_maybe* sret %[[AWAITER:.+]], %"struct.std::experimental::coroutine_traits<void, int>::promise_type"* %[[PROMISE]], i32 42)
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// See if we need to suspend:
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// --------------------------
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// CHECK: %[[READY:.+]] = call zeroext i1 @_ZN13suspend_maybe11await_readyEv(%struct.suspend_maybe* %[[AWAITABLE]])
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// CHECK: br i1 %[[READY]], label %[[READY_BB:.+]], label %[[SUSPEND_BB:.+]]
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// If we are suspending:
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// ---------------------
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// CHECK: [[SUSPEND_BB]]:
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// CHECK: %[[SUSPEND_ID:.+]] = call token @llvm.coro.save(
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// ---------------------------
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// Build the coroutine handle and pass it to await_suspend
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// ---------------------------
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// CHECK: call i8* @_ZNSt12experimental16coroutine_handleINS_16coroutine_traitsIJviEE12promise_typeEE12from_addressEPv(i8* %[[FRAME]])
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// ... many lines of code to coerce coroutine_handle into an i8* scalar
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// CHECK: %[[CH:.+]] = load i8*, i8** %{{.+}}
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// CHECK: %[[YES:.+]] = call zeroext i1 @_ZN13suspend_maybe13await_suspendENSt12experimental16coroutine_handleIvEE(%struct.suspend_maybe* %[[AWAITABLE]], i8* %[[CH]])
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// -------------------------------------------
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// See if await_suspend decided not to suspend
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// -------------------------------------------
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// CHECK: br i1 %[[YES]], label %[[SUSPEND_PLEASE:.+]], label %[[READY_BB]]
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// CHECK: [[SUSPEND_PLEASE]]:
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// CHECK: call i8 @llvm.coro.suspend(token %[[SUSPEND_ID]], i1 false)
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// CHECK: [[READY_BB]]:
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// CHECK: call void @_ZN13suspend_maybe12await_resumeEv(%struct.suspend_maybe* %[[AWAITABLE]])
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}
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struct ComplexAwaiter {
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template <typename F> void await_suspend(F);
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bool await_ready();
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_Complex float await_resume();
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};
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extern "C" void UseComplex(_Complex float);
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// CHECK-LABEL: @TestComplex(
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extern "C" void TestComplex() {
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UseComplex(co_await ComplexAwaiter{});
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// CHECK: call <2 x float> @_ZN14ComplexAwaiter12await_resumeEv(%struct.ComplexAwaiter*
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// CHECK: call void @UseComplex(<2 x float> %{{.+}})
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co_await ComplexAwaiter{};
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// CHECK: call <2 x float> @_ZN14ComplexAwaiter12await_resumeEv(%struct.ComplexAwaiter*
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_Complex float Val = co_await ComplexAwaiter{};
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// CHECK: call <2 x float> @_ZN14ComplexAwaiter12await_resumeEv(%struct.ComplexAwaiter*
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}
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struct Aggr { int X, Y, Z; ~Aggr(); };
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struct AggrAwaiter {
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template <typename F> void await_suspend(F);
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bool await_ready();
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Aggr await_resume();
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};
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extern "C" void Whatever();
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extern "C" void UseAggr(Aggr&&);
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// FIXME: Once the cleanup code is in, add testing that destructors for Aggr
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// are invoked properly on the cleanup branches.
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// CHECK-LABEL: @TestAggr(
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extern "C" void TestAggr() {
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UseAggr(co_await AggrAwaiter{});
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Whatever();
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// CHECK: call void @_ZN11AggrAwaiter12await_resumeEv(%struct.Aggr* sret %[[AwaitResume:.+]],
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// CHECK: call void @UseAggr(%struct.Aggr* dereferenceable(12) %[[AwaitResume]])
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// CHECK: call void @_ZN4AggrD1Ev(%struct.Aggr* %[[AwaitResume]])
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// CHECK: call void @Whatever()
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co_await AggrAwaiter{};
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Whatever();
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// CHECK: call void @_ZN11AggrAwaiter12await_resumeEv(%struct.Aggr* sret %[[AwaitResume2:.+]],
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// CHECK: call void @_ZN4AggrD1Ev(%struct.Aggr* %[[AwaitResume2]])
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// CHECK: call void @Whatever()
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Aggr Val = co_await AggrAwaiter{};
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Whatever();
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// CHECK: call void @_ZN11AggrAwaiter12await_resumeEv(%struct.Aggr* sret %[[AwaitResume3:.+]],
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// CHECK: call void @Whatever()
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// CHECK: call void @_ZN4AggrD1Ev(%struct.Aggr* %[[AwaitResume3]])
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}
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struct ScalarAwaiter {
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template <typename F> void await_suspend(F);
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bool await_ready();
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int await_resume();
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};
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extern "C" void UseScalar(int);
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// CHECK-LABEL: @TestScalar(
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extern "C" void TestScalar() {
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UseScalar(co_await ScalarAwaiter{});
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// CHECK: %[[Result:.+]] = call i32 @_ZN13ScalarAwaiter12await_resumeEv(%struct.ScalarAwaiter*
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// CHECK: call void @UseScalar(i32 %[[Result]])
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int Val = co_await ScalarAwaiter{};
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// CHECK: %[[Result2:.+]] = call i32 @_ZN13ScalarAwaiter12await_resumeEv(%struct.ScalarAwaiter*
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// CHECK: store i32 %[[Result2]], i32* %Val
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co_await ScalarAwaiter{};
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// CHECK: call i32 @_ZN13ScalarAwaiter12await_resumeEv(%struct.ScalarAwaiter*
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}
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// Test operator co_await codegen.
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enum class MyInt: int {};
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ScalarAwaiter operator co_await(MyInt);
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struct MyAgg {
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AggrAwaiter operator co_await();
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};
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// CHECK-LABEL: @TestOpAwait(
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extern "C" void TestOpAwait() {
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co_await MyInt(42);
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// CHECK: call void @_Zaw5MyInt(i32 42)
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// CHECK: call i32 @_ZN13ScalarAwaiter12await_resumeEv(%struct.ScalarAwaiter* %
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co_await MyAgg{};
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// CHECK: call void @_ZN5MyAggawEv(%struct.MyAgg* %
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// CHECK: call void @_ZN11AggrAwaiter12await_resumeEv(%struct.Aggr* sret %
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}
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// CHECK-LABEL: EndlessLoop(
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extern "C" void EndlessLoop() {
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// CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.begin(
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// See if initial_suspend was issued:
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// ----------------------------------
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// CHECK: call void @_ZNSt12experimental16coroutine_traitsIJvEE12promise_type15initial_suspendEv(
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// CHECK-NEXT: call zeroext i1 @_ZN9init_susp11await_readyEv(%struct.init_susp*
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for (;;)
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co_await suspend_always{};
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// Verify that final_suspend was NOT issued:
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// ----------------------------------
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// CHECK-NOT: call void @_ZNSt12experimental16coroutine_traitsIJvEE12promise_type13final_suspendEv(
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// CHECK-NOT: call zeroext i1 @_ZN10final_susp11await_readyEv(%struct.final_susp*
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}
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// Verifies that we don't crash when awaiting on an lvalue.
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// CHECK-LABEL: @_Z11AwaitLValuev(
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void AwaitLValue() {
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suspend_always lval;
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co_await lval;
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}
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struct RefTag { };
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struct AwaitResumeReturnsLValue {
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bool await_ready();
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void await_suspend(std::experimental::coroutine_handle<>);
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RefTag& await_resume();
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};
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template<>
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struct std::experimental::coroutine_traits<void,double> {
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struct promise_type {
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void get_return_object();
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init_susp initial_suspend();
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final_susp final_suspend();
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void return_void();
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AwaitResumeReturnsLValue yield_value(int);
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};
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};
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// Verifies that we don't crash when returning an lvalue from an await_resume()
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// expression.
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// CHECK-LABEL: define void @_Z18AwaitReturnsLValued(double)
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void AwaitReturnsLValue(double) {
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AwaitResumeReturnsLValue a;
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// CHECK: %[[AVAR:.+]] = alloca %struct.AwaitResumeReturnsLValue,
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// CHECK: %[[XVAR:.+]] = alloca %struct.RefTag*,
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// CHECK: %[[YVAR:.+]] = alloca %struct.RefTag*,
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// CHECK-NEXT: %[[TMP1:.+]] = alloca %struct.AwaitResumeReturnsLValue,
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// CHECK: %[[ZVAR:.+]] = alloca %struct.RefTag*,
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// CHECK-NEXT: %[[TMP2:.+]] = alloca %struct.AwaitResumeReturnsLValue,
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// CHECK: %[[RES1:.+]] = call dereferenceable({{.*}}) %struct.RefTag* @_ZN24AwaitResumeReturnsLValue12await_resumeEv(%struct.AwaitResumeReturnsLValue* %[[AVAR]])
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// CHECK-NEXT: store %struct.RefTag* %[[RES1]], %struct.RefTag** %[[XVAR]],
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RefTag& x = co_await a;
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// CHECK: %[[RES2:.+]] = call dereferenceable({{.*}}) %struct.RefTag* @_ZN24AwaitResumeReturnsLValue12await_resumeEv(%struct.AwaitResumeReturnsLValue* %[[TMP1]])
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// CHECK-NEXT: store %struct.RefTag* %[[RES2]], %struct.RefTag** %[[YVAR]],
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RefTag& y = co_await AwaitResumeReturnsLValue{};
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// CHECK: %[[RES3:.+]] = call dereferenceable({{.*}}) %struct.RefTag* @_ZN24AwaitResumeReturnsLValue12await_resumeEv(%struct.AwaitResumeReturnsLValue* %[[TMP2]])
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// CHECK-NEXT: store %struct.RefTag* %[[RES3]], %struct.RefTag** %[[ZVAR]],
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RefTag& z = co_yield 42;
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}
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