llvm/llvm/test/Instrumentation/AddressSanitizer/stack-poisoning.ll

; RUN: opt < %s -passes=asan -asan-use-after-return=never -S | FileCheck --check-prefix=CHECK-PLAIN --implicit-check-not=__asan_stack_malloc %s
; RUN: opt < %s -passes=asan -asan-use-after-return=runtime -S | FileCheck --check-prefixes=CHECK-UAR,CHECK-UAR-RUNTIME %s
; RUN: opt < %s -passes=asan -asan-use-after-return=always -S | FileCheck --check-prefixes=CHECK-UAR,CHECK-UAR-ALWAYS %s
target datalayout = "e-i64:64-f80:128-s:64-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

declare void @Foo(ptr)

define void @Bar() uwtable sanitize_address {
entry:
; CHECK-PLAIN-LABEL: Bar
; CHECK-PLAIN-NOT: label
; CHECK-PLAIN: ret void

; CHECK-UAR-LABEL: Bar
; CHECK-UAR-RUNTIME: load i32, ptr @__asan_option_detect_stack_use_after_return
; CHECK-UAR-RUNTIME: label
; CHECK-UAR-RUNTIME: call i64 @__asan_stack_malloc_4
; CHECK-UAR-ALWAYS: call i64 @__asan_stack_malloc_always_4
; CHECK-UAR-RUNTIME: label
; Poison red zones.
; CHECK-UAR: store i64 -1007680412564983311
; CHECK-UAR: store i64 72057598113936114
; CHECK-UAR: store i32 -218959118
; CHECK-UAR: store i64 -868082074056920316
; CHECK-UAR: store i16 -3085
; CHECK-UAR: call void @Foo
; CHECK-UAR: call void @Foo
; CHECK-UAR: call void @Foo
; If LocalStackBase != OrigStackBase
; CHECK-UAR: label
; Then Block: poison the entire frame.
  ; CHECK-UAR: call void @__asan_set_shadow_f5(i64 %{{[0-9]+}}, i64 128)
  ; CHECK-UAR-NOT: store i64
  ; CHECK-UAR: label
; Else Block: no UAR frame. Only unpoison the redzones.
  ; CHECK-UAR: store i64 0
  ; CHECK-UAR: store i64 0
  ; CHECK-UAR: store i32 0
  ; CHECK-UAR: store i64 0
  ; CHECK-UAR: store i16 0
  ; CHECK-UAR-NOT: store
  ; CHECK-UAR: label
; Done, no more stores.
; CHECK-UAR-NOT: store
; CHECK-UAR: ret void

  %x = alloca [20 x i8], align 16
  %y = alloca [25 x i8], align 1
  %z = alloca [500 x i8], align 1
  call void @Foo(ptr %x)
  call void @Foo(ptr %y)
  call void @Foo(ptr %z)
  ret void
}