third_party/llvm-7.0/llvm/test/Instrumentation/AddressSanitizer/stack-poisoning.ll

; RUN: opt < %s -asan -asan-module -asan-use-after-return -S | FileCheck --check-prefix=CHECK-UAR %s
; RUN: opt < %s -asan -asan-module -asan-use-after-return=0 -S | FileCheck --check-prefix=CHECK-PLAIN %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(i8*)

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: load i32, i32* @__asan_option_detect_stack_use_after_return
; CHECK-UAR: label
; CHECK-UAR: call i64 @__asan_stack_malloc_4
; CHECK-UAR: 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
  %xx = getelementptr inbounds [20 x i8], [20 x i8]* %x, i64 0, i64 0
  call void @Foo(i8* %xx)
  %yy = getelementptr inbounds [25 x i8], [25 x i8]* %y, i64 0, i64 0
  call void @Foo(i8* %yy)
  %zz = getelementptr inbounds [500 x i8], [500 x i8]* %z, i64 0, i64 0
  call void @Foo(i8* %zz)
  ret void
}