llvm-project/clang/test/CodeGenCoroutines/coro-alloc.cpp

// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcoroutines-ts -std=c++14 -emit-llvm %s -o - -disable-llvm-passes | FileCheck %s

namespace std {
namespace experimental {
template <typename... T>
struct coroutine_traits; // expected-note {{declared here}}

template <class Promise = void>
struct coroutine_handle {
  coroutine_handle() = default;
  static coroutine_handle from_address(void *) { return {}; }
};

template <>
struct coroutine_handle<void> {
  static coroutine_handle from_address(void *) { return {}; }
  coroutine_handle() = default;
  template <class PromiseType>
  coroutine_handle(coroutine_handle<PromiseType>) {}
};

} // end namespace experimental

struct nothrow_t {};
constexpr nothrow_t nothrow = {};

} // end namespace std

// Required when get_return_object_on_allocation_failure() is defined by
// the promise.
using SizeT = decltype(sizeof(int));
void* operator new(SizeT __sz, const std::nothrow_t&) noexcept;
void  operator delete(void* __p, const std::nothrow_t&) noexcept;


struct suspend_always {
  bool await_ready() { return false; }
  void await_suspend(std::experimental::coroutine_handle<>) {}
  void await_resume() {}
};

struct global_new_delete_tag {};

template<>
struct std::experimental::coroutine_traits<void, global_new_delete_tag> {
  struct promise_type {
    void get_return_object() {}
    suspend_always initial_suspend() { return {}; }
    suspend_always final_suspend() { return {}; }
    void return_void() {}
  };
};

// CHECK-LABEL: f0(
extern "C" void f0(global_new_delete_tag) {
  // CHECK: %[[ID:.+]] = call token @llvm.coro.id(i32 16
  // CHECK: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
  // CHECK: call i8* @_Znwm(i64 %[[SIZE]])

  // CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.frame()
  // CHECK: %[[MEM:.+]] = call i8* @llvm.coro.free(token %[[ID]], i8* %[[FRAME]])
  // CHECK: call void @_ZdlPv(i8* %[[MEM]])
  co_return;
}

struct promise_new_tag {};

template<>
struct std::experimental::coroutine_traits<void, promise_new_tag> {
  struct promise_type {
    void *operator new(unsigned long);
    void get_return_object() {}
    suspend_always initial_suspend() { return {}; }
    suspend_always final_suspend() { return {}; }
    void return_void() {}
  };
};

// CHECK-LABEL: f1(
extern "C" void f1(promise_new_tag ) {
  // CHECK: %[[ID:.+]] = call token @llvm.coro.id(i32 16
  // CHECK: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
  // CHECK: call i8* @_ZNSt12experimental16coroutine_traitsIJv15promise_new_tagEE12promise_typenwEm(i64 %[[SIZE]])

  // CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.frame()
  // CHECK: %[[MEM:.+]] = call i8* @llvm.coro.free(token %[[ID]], i8* %[[FRAME]])
  // CHECK: call void @_ZdlPv(i8* %[[MEM]])
  co_return;
}

struct promise_delete_tag {};

template<>
struct std::experimental::coroutine_traits<void, promise_delete_tag> {
  struct promise_type {
    void operator delete(void*);
    void get_return_object() {}
    suspend_always initial_suspend() { return {}; }
    suspend_always final_suspend() { return {}; }
    void return_void() {}
  };
};

// CHECK-LABEL: f2(
extern "C" void f2(promise_delete_tag) {
  // CHECK: %[[ID:.+]] = call token @llvm.coro.id(i32 16
  // CHECK: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
  // CHECK: call i8* @_Znwm(i64 %[[SIZE]])

  // CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.frame()
  // CHECK: %[[MEM:.+]] = call i8* @llvm.coro.free(token %[[ID]], i8* %[[FRAME]])
  // CHECK: call void @_ZNSt12experimental16coroutine_traitsIJv18promise_delete_tagEE12promise_typedlEPv(i8* %[[MEM]])
  co_return;
}

struct promise_sized_delete_tag {};

template<>
struct std::experimental::coroutine_traits<void, promise_sized_delete_tag> {
  struct promise_type {
    void operator delete(void*, unsigned long);
    void get_return_object() {}
    suspend_always initial_suspend() { return {}; }
    suspend_always final_suspend() { return {}; }
    void return_void() {}
  };
};

// CHECK-LABEL: f3(
extern "C" void f3(promise_sized_delete_tag) {
  // CHECK: %[[ID:.+]] = call token @llvm.coro.id(i32 16
  // CHECK: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
  // CHECK: call i8* @_Znwm(i64 %[[SIZE]])

  // CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.frame()
  // CHECK: %[[MEM:.+]] = call i8* @llvm.coro.free(token %[[ID]], i8* %[[FRAME]])
  // CHECK: %[[SIZE2:.+]] = call i64 @llvm.coro.size.i64()
  // CHECK: call void @_ZNSt12experimental16coroutine_traitsIJv24promise_sized_delete_tagEE12promise_typedlEPvm(i8* %[[MEM]], i64 %[[SIZE2]])
  co_return;
}

struct promise_on_alloc_failure_tag {};

template<>
struct std::experimental::coroutine_traits<int, promise_on_alloc_failure_tag> {
  struct promise_type {
    int get_return_object() {}
    suspend_always initial_suspend() { return {}; }
    suspend_always final_suspend() { return {}; }
    void return_void() {}
    static int get_return_object_on_allocation_failure() { return -1; }
  };
};

// CHECK-LABEL: f4(
extern "C" int f4(promise_on_alloc_failure_tag) {
  // CHECK: %[[ID:.+]] = call token @llvm.coro.id(i32 16
  // CHECK: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
  // CHECK: %[[MEM:.+]] = call i8* @_ZnwmRKSt9nothrow_t(i64 %[[SIZE]], %"struct.std::nothrow_t"* dereferenceable(1) @_ZStL7nothrow)
  // CHECK: %[[OK:.+]] = icmp ne i8* %[[MEM]], null
  // CHECK: br i1 %[[OK]], label %[[OKBB:.+]], label %[[ERRBB:.+]]

  // CHECK: [[ERRBB]]:
  // CHECK: %[[RETVAL:.+]] = call i32 @_ZNSt12experimental16coroutine_traitsIJi28promise_on_alloc_failure_tagEE12promise_type39get_return_object_on_allocation_failureEv(
  // CHECK: ret i32 %[[RETVAL]]
  co_return;
}