clang/test/CodeGenCoroutines/coro-params-exp-namespace.cpp

   1 // Verifies that parameters are copied with move constructors
   2 // Verifies that parameter copies are destroyed
   3 // Vefifies that parameter copies are used in the body of the coroutine
   4 // Verifies that parameter copies are used to construct the promise type, if that type has a matching constructor
   5 // RUN: %clang_cc1 -std=c++1z -fcoroutines-ts -triple=x86_64-unknown-linux-gnu -emit-llvm -o - %s -disable-llvm-passes -fexceptions | FileCheck %s
   6
   7 namespace std::experimental {
   8 template <typename... T> struct coroutine_traits;
   9
  10 template <class Promise = void> struct coroutine_handle {
  11   coroutine_handle() = default;
  12   static coroutine_handle from_address(void *) noexcept;
  13 };
  14 template <> struct coroutine_handle<void> {
  15   static coroutine_handle from_address(void *) noexcept;
  16   coroutine_handle() = default;
  17   template <class PromiseType>
  18   coroutine_handle(coroutine_handle<PromiseType>) noexcept;
  19 };
  20 } // namespace std::experimental
  21
  22 struct suspend_always {
  23   bool await_ready() noexcept;
  24   void await_suspend(std::experimental::coroutine_handle<>) noexcept;
  25   void await_resume() noexcept;
  26 };
  27
  28 template <typename... Args> struct std::experimental::coroutine_traits<void, Args...> {
  29   struct promise_type {
  30     void get_return_object() noexcept;
  31     suspend_always initial_suspend() noexcept;
  32     suspend_always final_suspend() noexcept;
  33     void return_void() noexcept;
  34     promise_type();
  35     ~promise_type() noexcept;
  36     void unhandled_exception() noexcept;
  37   };
  38 };
  39
  40 // TODO: Not supported yet
  41 struct CopyOnly {
  42   int val;
  43   CopyOnly(const CopyOnly &) noexcept;
  44   CopyOnly(CopyOnly &&) = delete;
  45   ~CopyOnly();
  46 };
  47
  48 struct MoveOnly {
  49   int val;
  50   MoveOnly(const MoveOnly &) = delete;
  51   MoveOnly(MoveOnly &&) noexcept;
  52   ~MoveOnly();
  53 };
  54
  55 struct MoveAndCopy {
  56   int val;
  57   MoveAndCopy(const MoveAndCopy &) noexcept;
  58   MoveAndCopy(MoveAndCopy &&) noexcept;
  59   ~MoveAndCopy();
  60 };
  61
  62 void consume(int, int, int) noexcept;
  63
  64 // TODO: Add support for CopyOnly params
  65 // CHECK: define{{.*}} void @_Z1fi8MoveOnly11MoveAndCopy(i32 noundef %val, %struct.MoveOnly* noundef %[[MoParam:.+]], %struct.MoveAndCopy* noundef %[[McParam:.+]]) #0 personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*
  66 void f(int val, MoveOnly moParam, MoveAndCopy mcParam) {
  67   // CHECK: %[[MoCopy:.+]] = alloca %struct.MoveOnly
  68   // CHECK: %[[McCopy:.+]] = alloca %struct.MoveAndCopy
  69   // CHECK: store i32 %val, i32* %[[ValAddr:.+]]
  70
  71   // CHECK: call i8* @llvm.coro.begin(
  72   // CHECK: call void @_ZN8MoveOnlyC1EOS_(%struct.MoveOnly* {{[^,]*}} %[[MoCopy]], %struct.MoveOnly* noundef nonnull align 4 dereferenceable(4) %[[MoParam]])
  73   // CHECK-NEXT: bitcast %struct.MoveAndCopy* %[[McCopy]] to i8*
  74   // CHECK-NEXT: call void @llvm.lifetime.start.p0i8(
  75   // CHECK-NEXT: call void @_ZN11MoveAndCopyC1EOS_(%struct.MoveAndCopy* {{[^,]*}} %[[McCopy]], %struct.MoveAndCopy* noundef nonnull align 4 dereferenceable(4) %[[McParam]]) #
  76   // CHECK-NEXT: bitcast %"struct.std::experimental::coroutine_traits<void, int, MoveOnly, MoveAndCopy>::promise_type"* %__promise to i8*
  77   // CHECK-NEXT: call void @llvm.lifetime.start.p0i8(
  78   // CHECK-NEXT: invoke void @_ZNSt12experimental16coroutine_traitsIJvi8MoveOnly11MoveAndCopyEE12promise_typeC1Ev(
  79
  80   // CHECK: call void @_ZN14suspend_always12await_resumeEv(
  81   // CHECK: %[[IntParam:.+]] = load i32, i32* %{{.*}}
  82   // CHECK: %[[MoGep:.+]] = getelementptr inbounds %struct.MoveOnly, %struct.MoveOnly* %[[MoCopy]], i32 0, i32 0
  83   // CHECK: %[[MoVal:.+]] = load i32, i32* %[[MoGep]]
  84   // CHECK: %[[McGep:.+]] =  getelementptr inbounds %struct.MoveAndCopy, %struct.MoveAndCopy* %[[McCopy]], i32 0, i32 0
  85   // CHECK: %[[McVal:.+]] = load i32, i32* %[[McGep]]
  86   // CHECK: call void @_Z7consumeiii(i32 noundef %[[IntParam]], i32 noundef %[[MoVal]], i32 noundef %[[McVal]])
  87
  88   consume(val, moParam.val, mcParam.val);
  89   co_return;
  90
  91   // Skip to final suspend:
  92   // CHECK: call void @_ZNSt12experimental16coroutine_traitsIJvi8MoveOnly11MoveAndCopyEE12promise_type13final_suspendEv(
  93   // CHECK: call void @_ZN14suspend_always12await_resumeEv(
  94
  95   // Destroy promise, then parameter copies:
  96   // CHECK: call void @_ZNSt12experimental16coroutine_traitsIJvi8MoveOnly11MoveAndCopyEE12promise_typeD1Ev(%"struct.std::experimental::coroutine_traits<void, int, MoveOnly, MoveAndCopy>::promise_type"* {{[^,]*}} %__promise)
  97   // CHECK-NEXT: bitcast %"struct.std::experimental::coroutine_traits<void, int, MoveOnly, MoveAndCopy>::promise_type"* %__promise to i8*
  98   // CHECK-NEXT: call void @llvm.lifetime.end.p0i8(
  99   // CHECK-NEXT: call void @_ZN11MoveAndCopyD1Ev(%struct.MoveAndCopy* {{[^,]*}} %[[McCopy]])
 100   // CHECK-NEXT: bitcast %struct.MoveAndCopy* %[[McCopy]] to i8*
 101   // CHECK-NEXT: call void @llvm.lifetime.end.p0i8(
 102   // CHECK-NEXT: call void @_ZN8MoveOnlyD1Ev(%struct.MoveOnly* {{[^,]*}} %[[MoCopy]]
 103   // CHECK-NEXT: bitcast %struct.MoveOnly* %[[MoCopy]] to i8*
 104   // CHECK-NEXT: call void @llvm.lifetime.end.p0i8(
 105   // CHECK-NEXT: bitcast i32* %{{.+}} to i8*
 106   // CHECK-NEXT: call void @llvm.lifetime.end.p0i8(
 107   // CHECK-NEXT: call i8* @llvm.coro.free(
 108 }
 109
 110 // CHECK-LABEL: void @_Z16dependent_paramsI1A1BEvT_T0_S3_(%struct.A* noundef %x, %struct.B* noundef %0, %struct.B* noundef %y)
 111 template <typename T, typename U>
 112 void dependent_params(T x, U, U y) {
 113   // CHECK: %[[x_copy:.+]] = alloca %struct.A
 114   // CHECK-NEXT: %[[unnamed_copy:.+]] = alloca %struct.B
 115   // CHECK-NEXT: %[[y_copy:.+]] = alloca %struct.B
 116
 117   // CHECK: call i8* @llvm.coro.begin
 118   // CHECK-NEXT: bitcast %struct.A* %[[x_copy]] to i8*
 119   // CHECK-NEXT: call void @llvm.lifetime.start.p0i8(
 120   // CHECK-NEXT: call void @_ZN1AC1EOS_(%struct.A* {{[^,]*}} %[[x_copy]], %struct.A* noundef nonnull align 4 dereferenceable(512) %x)
 121   // CHECK-NEXT: bitcast %struct.B* %[[unnamed_copy]] to i8*
 122   // CHECK-NEXT: call void @llvm.lifetime.start.p0i8(
 123   // CHECK-NEXT: call void @_ZN1BC1EOS_(%struct.B* {{[^,]*}} %[[unnamed_copy]], %struct.B* noundef nonnull align 4 dereferenceable(512) %0)
 124   // CHECK-NEXT: bitcast %struct.B* %[[y_copy]] to i8*
 125   // CHECK-NEXT: call void @llvm.lifetime.start.p0i8(
 126   // CHECK-NEXT: call void @_ZN1BC1EOS_(%struct.B* {{[^,]*}} %[[y_copy]], %struct.B* noundef nonnull align 4 dereferenceable(512) %y)
 127   // CHECK-NEXT: bitcast %"struct.std::experimental::coroutine_traits<void, A, B, B>::promise_type"* %__promise to i8*
 128   // CHECK-NEXT: call void @llvm.lifetime.start.p0i8(
 129   // CHECK-NEXT: invoke void @_ZNSt12experimental16coroutine_traitsIJv1A1BS2_EE12promise_typeC1Ev(
 130
 131   co_return;
 132 }
 133
 134 struct A {
 135   int WontFitIntoRegisterForSure[128];
 136   A();
 137   A(A &&)
 138   noexcept;
 139   ~A();
 140 };
 141
 142 struct B {
 143   int WontFitIntoRegisterForSure[128];
 144   B();
 145   B(B &&)
 146   noexcept;
 147   ~B();
 148 };
 149
 150 void call_dependent_params() {
 151   dependent_params(A{}, B{}, B{});
 152 }
 153
 154 // Test that, when the promise type has a constructor whose signature matches
 155 // that of the coroutine function, that constructor is used. This is an
 156 // experimental feature that will be proposed for the Coroutines TS.
 157
 158 struct promise_matching_constructor {};
 159
 160 template <>
 161 struct std::experimental::coroutine_traits<void, promise_matching_constructor, int, float, double> {
 162   struct promise_type {
 163     promise_type(promise_matching_constructor, int, float, double) {}
 164     promise_type() = delete;
 165     void get_return_object() {}
 166     suspend_always initial_suspend() { return {}; }
 167     suspend_always final_suspend() noexcept { return {}; }
 168     void return_void() {}
 169     void unhandled_exception() {}
 170   };
 171 };
 172
 173 // CHECK-LABEL: void @_Z38coroutine_matching_promise_constructor28promise_matching_constructorifd(i32 noundef %0, float noundef %1, double noundef %2)
 174 void coroutine_matching_promise_constructor(promise_matching_constructor, int, float, double) {
 175   // CHECK: %[[INT:.+]] = load i32, i32* %5, align 4
 176   // CHECK: %[[FLOAT:.+]] = load float, float* %6, align 4
 177   // CHECK: %[[DOUBLE:.+]] = load double, double* %7, align 8
 178   // CHECK: invoke void @_ZNSt12experimental16coroutine_traitsIJv28promise_matching_constructorifdEE12promise_typeC1ES1_ifd(%"struct.std::experimental::coroutine_traits<void, promise_matching_constructor, int, float, double>::promise_type"* {{[^,]*}} %__promise, i32 noundef %[[INT]], float noundef %[[FLOAT]], double noundef %[[DOUBLE]])
 179   co_return;
 180 }
 181
 182 struct some_class;
 183
 184 struct method {};
 185
 186 template <typename... Args> struct std::experimental::coroutine_traits<method, Args...> {
 187   struct promise_type {
 188     promise_type(some_class &, float);
 189     method get_return_object();
 190     suspend_always initial_suspend();
 191     suspend_always final_suspend() noexcept;
 192     void return_void();
 193     void unhandled_exception();
 194   };
 195 };
 196
 197 struct some_class {
 198   method good_coroutine_calls_custom_constructor(float);
 199 };
 200
 201 // CHECK-LABEL: define{{.*}} void @_ZN10some_class39good_coroutine_calls_custom_constructorEf(%struct.some_class*
 202 method some_class::good_coroutine_calls_custom_constructor(float) {
 203   // CHECK: invoke void @_ZNSt12experimental16coroutine_traitsIJ6methodR10some_classfEE12promise_typeC1ES3_f(%"struct.std::experimental::coroutine_traits<method, some_class &, float>::promise_type"* {{[^,]*}} %__promise, %struct.some_class* noundef nonnull align 1 dereferenceable(1) %{{.+}}, float
 204   co_return;
 205 }