xref: /llvm-project/llvm/test/Transforms/Coroutines/coro-async-addr-lifetime-infinite-loop-bug.ll (revision 2e29c91b96832504b9008be5e095f7dd640cdea0) 
1; RUN: opt < %s -O0 -S | FileCheck --check-prefixes=CHECK %s
2
3target datalayout = "p:64:64:64"
4
5%async.task = type { i64 }
6%async.actor = type { i64 }
7%async.fp = type <{ i32, i32 }>
8
9%async.ctxt = type { ptr, ptr }
10
11; The async callee.
12@my_other_async_function_fp = external global <{ i32, i32 }>
13declare void @my_other_async_function(ptr %async.ctxt)
14
15@my_async_function_fp = constant <{ i32, i32 }>
16  <{ i32 trunc ( ; Relative pointer to async function
17       i64 sub (
18         i64 ptrtoint (ptr @my_async_function to i64),
19         i64 ptrtoint (ptr getelementptr inbounds (<{ i32, i32 }>, ptr @my_async_function_fp, i32 0, i32 1) to i64)
20       )
21     to i32),
22     i32 128    ; Initial async context size without space for frame
23}>
24
25define swiftcc void @my_other_async_function_fp.apply(ptr %fnPtr, ptr %async.ctxt) {
26  tail call swiftcc void %fnPtr(ptr %async.ctxt)
27  ret void
28}
29
30declare void @escape(ptr)
31declare void @store_resume(ptr)
32define ptr @resume_context_projection(ptr %ctxt) {
33entry:
34  %resume_ctxt = load ptr, ptr %ctxt, align 8
35  ret ptr %resume_ctxt
36}
37
38; The address of alloca escapes but the analysis based on lifetimes fails to see
39; that it can't localize this alloca.
40; CHECK: define swiftcc void @my_async_function(ptr swiftasync %async.ctxt) {
41; CHECK: entry:
42; CHECK-NOT: ret
43; CHECK-NOT:   [[ESCAPED_ADDR:%.*]] = alloca i64, align 8
44; CHECK: ret
45define swiftcc void @my_async_function(ptr swiftasync %async.ctxt) {
46entry:
47  %escaped_addr = alloca i64
48
49  %id = call token @llvm.coro.id.async(i32 128, i32 16, i32 0,
50          ptr @my_async_function_fp)
51  %hdl = call ptr @llvm.coro.begin(token %id, ptr null)
52  call void @llvm.lifetime.start.p0(i64 4, ptr %escaped_addr)
53  call void @escape(ptr %escaped_addr)
54  br label %callblock
55
56
57callblock:
58
59  %callee_context = call ptr @context_alloc()
60
61  %resume.func_ptr = call ptr @llvm.coro.async.resume()
62  call void @store_resume(ptr %resume.func_ptr)
63  %res = call {ptr, ptr, ptr} (i32, ptr, ptr, ...) @llvm.coro.suspend.async(i32 0,
64                                                  ptr %resume.func_ptr,
65                                                  ptr @resume_context_projection,
66                                                  ptr @my_other_async_function_fp.apply,
67                                                  ptr @asyncSuspend, ptr %callee_context)
68  br label %callblock
69}
70
71declare { ptr, ptr, ptr, ptr } @llvm.coro.suspend.async.sl_p0i8p0i8p0i8p0i8s(i32, ptr, ptr, ...)
72declare ptr @llvm.coro.prepare.async(ptr)
73declare token @llvm.coro.id.async(i32, i32, i32, ptr)
74declare ptr @llvm.coro.begin(token, ptr)
75declare i1 @llvm.coro.end.async(ptr, i1, ...)
76declare i1 @llvm.coro.end(ptr, i1, token)
77declare {ptr, ptr, ptr} @llvm.coro.suspend.async(i32, ptr, ptr, ...)
78declare ptr @context_alloc()
79declare void @llvm.coro.async.context.dealloc(ptr)
80declare swiftcc void @asyncSuspend(ptr)
81declare ptr @llvm.coro.async.resume()
82declare void @llvm.coro.async.size.replace(ptr, ptr)
83declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0
84declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0
85attributes #0 = { argmemonly nofree nosync nounwind willreturn }
86