1; RUN: opt < %s -asan -asan-module -asan-use-after-return -S | FileCheck --check-prefix=CHECK-UAR %s
2; RUN: opt < %s -asan -asan-module -asan-use-after-return=0 -S | FileCheck --check-prefix=CHECK-PLAIN %s
3target datalayout = "e-i64:64-f80:128-s:64-n8:16:32:64-S128"
4target triple = "x86_64-unknown-linux-gnu"
5
6declare void @Foo(i8*)
7
8define void @Bar() uwtable sanitize_address {
9entry:
10; CHECK-PLAIN-LABEL: Bar
11; CHECK-PLAIN-NOT: label
12; CHECK-PLAIN: ret void
13
14; CHECK-UAR-LABEL: Bar
15; CHECK-UAR: load i32, i32* @__asan_option_detect_stack_use_after_return
16; CHECK-UAR: label
17; CHECK-UAR: call i64 @__asan_stack_malloc_1
18; CHECK-UAR: label
19; CHECK-UAR: call void @Foo
20; If LocalStackBase != OrigStackBase
21; CHECK-UAR: label
22; Then Block: poison the entire frame.
23  ; CHECK-UAR: store i64 -723401728380766731
24  ; CHECK-UAR: store i64 -723401728380766731
25  ; CHECK-UAR: store i8 0
26  ; CHECK-UAR-NOT: store
27  ; CHECK-UAR: label
28; Else Block: no UAR frame. Only unpoison the redzones.
29  ; CHECK-UAR: store i64 0
30  ; CHECK-UAR: store i32 0
31  ; CHECK-UAR-NOT: store
32  ; CHECK-UAR: label
33; Done, no more stores.
34; CHECK-UAR-NOT: store
35; CHECK-UAR: ret void
36
37  %x = alloca [20 x i8], align 16
38  %arraydecay = getelementptr inbounds [20 x i8], [20 x i8]* %x, i64 0, i64 0
39  call void @Foo(i8* %arraydecay)
40  ret void
41}
42
43
44