llvm/llvm/test/Instrumentation/AddressSanitizer/instrument-dynamic-allocas.ll

; Test asan internal compiler flags:
;   -asan-instrument-dynamic-allocas

; RUN: opt < %s -passes=asan -asan-instrument-dynamic-allocas -S | FileCheck %s --check-prefix=CHECK-ALLOCA
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"

define void @foo(i32 %len) sanitize_address {
entry:
; CHECK-ALLOCA-LABEL: define void @foo
; CHECK-ALLOCA: __asan_alloca_poison
; CHECK-ALLOCA: __asan_allocas_unpoison
; CHECK-ALLOCA: ret void
  %0 = alloca i32, align 4
  %1 = alloca ptr
  store volatile i32 %len, ptr %0, align 4
  %2 = load i32, ptr %0, align 4
  %3 = zext i32 %2 to i64
  %4 = alloca i8, i64 %3, align 32
  store volatile i8 0, ptr %4
  ret void
}

; Test that dynamic alloca is not used for inalloca variables.
define void @has_inalloca() uwtable sanitize_address {
; CHECK-ALLOCA-LABEL: define void @has_inalloca
; CHECK-ALLOCA-NOT: __asan_alloca_poison
; CHECK-ALLOCA-NOT: __asan_alloca_unpoison
; CHECK-ALLOCA: ret void
entry:
  %t = alloca inalloca i32
  store i32 42, ptr %t
  call void @pass_inalloca(ptr inalloca(i32) %t)
  ret void
}

declare void @pass_inalloca(ptr inalloca(i32))