1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
| // Verify that coroutine promise and allocated memory are freed up on exception.
// RUN: %clang_cc1 -std=c++1z -fcoroutines-ts -triple=x86_64-unknown-linux-gnu -emit-llvm -o - %s -fexceptions -fcxx-exceptions -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;
};
template <> struct coroutine_handle<void> {
static coroutine_handle from_address(void *) noexcept;
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() noexcept;
suspend_always initial_suspend() noexcept;
suspend_always final_suspend() noexcept;
void return_void() noexcept;
promise_type();
~promise_type();
void unhandled_exception() noexcept;
};
};
struct Cleanup { ~Cleanup(); };
void may_throw();
// CHECK-LABEL: define void @_Z1fv(
void f() {
// CHECK: call i8* @_Znwm(i64
// If promise constructor throws, check that we free the memory.
// CHECK: invoke void @_ZNSt12experimental16coroutine_traitsIJvEE12promise_typeC1Ev(
// CHECK-NEXT: to label %{{.+}} unwind label %[[DeallocPad:.+]]
// CHECK: [[DeallocPad]]:
// CHECK-NEXT: landingpad
// CHECK-NEXT: cleanup
// CHECK: br label %[[Dealloc:.+]]
Cleanup cleanup;
may_throw();
// if may_throw throws, check that we destroy the promise and free the memory.
// CHECK: invoke void @_Z9may_throwv(
// CHECK-NEXT: to label %{{.+}} unwind label %[[CatchPad:.+]]
// CHECK: [[CatchPad]]:
// CHECK-NEXT: landingpad
// CHECK-NEXT: catch i8* null
// CHECK: call void @_ZN7CleanupD1Ev(
// CHECK: br label %[[Catch:.+]]
// CHECK: [[Catch]]:
// CHECK: call i8* @__cxa_begin_catch(
// CHECK: call void @_ZNSt12experimental16coroutine_traitsIJvEE12promise_type19unhandled_exceptionEv(
// CHECK: invoke void @__cxa_end_catch()
// CHECK-NEXT: to label %[[Cont:.+]] unwind
// CHECK: [[Cont]]:
// CHECK-NEXT: br label %[[Cont2:.+]]
// CHECK: [[Cont2]]:
// CHECK-NEXT: br label %[[Cleanup:.+]]
// CHECK: [[Cleanup]]:
// CHECK: call void @_ZNSt12experimental16coroutine_traitsIJvEE12promise_typeD1Ev(
// CHECK: %[[Mem0:.+]] = call i8* @llvm.coro.free(
// CHECK: call void @_ZdlPv(i8* %[[Mem0]]
// CHECK: [[Dealloc]]:
// CHECK: %[[Mem:.+]] = call i8* @llvm.coro.free(
// CHECK: call void @_ZdlPv(i8* %[[Mem]])
co_return;
}
// CHECK-LABEL: define void @_Z1gv(
void g() {
for (;;)
co_await suspend_always{};
// Since this is the endless loop there should be no fallthrough handler (call to 'return_void').
// CHECK-NOT: call void @_ZNSt12experimental16coroutine_traitsIJvEE12promise_type11return_voidEv
}
|