1; To test that safestack does not break the musttail call contract.
2;
3; RUN: opt < %s --safe-stack -S | FileCheck %s
4
5target triple = "x86_64-unknown-linux-gnu"
6
7declare i32 @foo(i32* %p)
8declare void @alloca_test_use([10 x i8]*)
9
10define i32 @call_foo(i32* %a) safestack {
11; CHECK-LABEL: @call_foo(
12; CHECK-NEXT:    [[UNSAFE_STACK_PTR:%.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr, align 8
13; CHECK-NEXT:    [[UNSAFE_STACK_STATIC_TOP:%.*]] = getelementptr i8, i8* [[UNSAFE_STACK_PTR]], i32 -16
14; CHECK-NEXT:    store i8* [[UNSAFE_STACK_STATIC_TOP]], i8** @__safestack_unsafe_stack_ptr, align 8
15; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr i8, i8* [[UNSAFE_STACK_PTR]], i32 -10
16; CHECK-NEXT:    [[X_UNSAFE:%.*]] = bitcast i8* [[TMP1]] to [10 x i8]*
17; CHECK-NEXT:    call void @alloca_test_use([10 x i8]* [[X_UNSAFE]])
18; CHECK-NEXT:    store i8* [[UNSAFE_STACK_PTR]], i8** @__safestack_unsafe_stack_ptr, align 8
19; CHECK-NEXT:    [[R:%.*]] = musttail call i32 @foo(i32* [[A:%.*]])
20; CHECK-NEXT:    ret i32 [[R]]
21;
22  %x = alloca [10 x i8], align 1
23  call void @alloca_test_use([10 x i8]* %x)
24  %r = musttail call i32 @foo(i32* %a)
25  ret i32 %r
26}
27
28define i32 @call_foo_cast(i32* %a) safestack {
29; CHECK-LABEL: @call_foo_cast(
30; CHECK-NEXT:    [[UNSAFE_STACK_PTR:%.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr, align 8
31; CHECK-NEXT:    [[UNSAFE_STACK_STATIC_TOP:%.*]] = getelementptr i8, i8* [[UNSAFE_STACK_PTR]], i32 -16
32; CHECK-NEXT:    store i8* [[UNSAFE_STACK_STATIC_TOP]], i8** @__safestack_unsafe_stack_ptr, align 8
33; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr i8, i8* [[UNSAFE_STACK_PTR]], i32 -10
34; CHECK-NEXT:    [[X_UNSAFE:%.*]] = bitcast i8* [[TMP1]] to [10 x i8]*
35; CHECK-NEXT:    call void @alloca_test_use([10 x i8]* [[X_UNSAFE]])
36; CHECK-NEXT:    store i8* [[UNSAFE_STACK_PTR]], i8** @__safestack_unsafe_stack_ptr, align 8
37; CHECK-NEXT:    [[R:%.*]] = musttail call i32 @foo(i32* [[A:%.*]])
38; CHECK-NEXT:    [[T:%.*]] = bitcast i32 [[R]] to i32
39; CHECK-NEXT:    ret i32 [[T]]
40;
41  %x = alloca [10 x i8], align 1
42  call void @alloca_test_use([10 x i8]* %x)
43  %r = musttail call i32 @foo(i32* %a)
44  %t = bitcast i32 %r to i32
45  ret i32 %t
46}
47