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
|
; RUN: opt -S -aarch64-stack-tagging %s -o - | FileCheck %s
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-unknown-linux-android29"
@stackbuf = dso_local local_unnamed_addr global ptr null, align 8
@jbuf = dso_local global [32 x i64] zeroinitializer, align 8
declare void @may_jump()
define dso_local noundef i1 @_Z6targetv() sanitize_memtag {
entry:
%buf = alloca [4096 x i8], align 1
%call = call i32 @setjmp(ptr noundef @jbuf)
switch i32 %call, label %while.body [
i32 1, label %return
i32 2, label %sw.bb1
]
sw.bb1: ; preds = %entry
br label %return
while.body: ; preds = %entry
call void @llvm.lifetime.start.p0(i64 4096, ptr nonnull %buf) #10
store ptr %buf, ptr @stackbuf, align 8
; may_jump may call longjmp, going back to the switch (and then the return),
; bypassing the lifetime.end. This is why we need to untag on the return,
; rather than the lifetime.end.
call void @may_jump()
call void @llvm.lifetime.end.p0(i64 4096, ptr nonnull %buf) #10
br label %return
; CHECK-LABEL: return:
; CHECK: call void @llvm.aarch64.settag
return: ; preds = %entry, %while.body, %sw.bb1
%retval.0 = phi i1 [ true, %while.body ], [ true, %sw.bb1 ], [ false, %entry ]
ret i1 %retval.0
}
declare i32 @setjmp(ptr noundef) returns_twice
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture)
|
