| ; RUN: opt -passes=hwasan -hwasan-use-stack-safety=0 -hwasan-use-after-scope -S < %s | 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 i8* null, align 8 |
| @jbuf = dso_local global [32 x i64] zeroinitializer, align 8 |
| |
| declare void @may_jump() |
| |
| define dso_local noundef i1 @_Z6targetv() sanitize_hwaddress { |
| entry: |
| %buf = alloca [4096 x i8], align 1 |
| %call = call i32 @setjmp(i64* noundef getelementptr inbounds ([32 x i64], [32 x i64]* @jbuf, i64 0, i64 0)) |
| 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 |
| %0 = getelementptr inbounds [4096 x i8], [4096 x i8]* %buf, i64 0, i64 0 |
| call void @llvm.lifetime.start.p0i8(i64 4096, i8* nonnull %0) #10 |
| store i8* %0, i8** @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.p0i8(i64 4096, i8* nonnull %0) #10 |
| br label %return |
| |
| ; CHECK-LABEL: return: |
| ; CHECK: void @llvm.memset.p0i8.i64({{.*}}, i8 0, i64 256, i1 false) |
| 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(i64* noundef) returns_twice |
| |
| declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) |
| declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) |
