[ASan] Disable instrumentation for inalloca variables.

inalloca variables were not treated as static allocas, therefore didn't
participate in regular stack instrumentation. We don't want them to
participate in dynamic alloca instrumentation as well.

llvm-svn: 252213

1 files changed, 16 insertions, 0 deletions

diff --git a/llvm/test/Instrumentation/AddressSanitizer/instrument-dynamic-allocas.ll b/llvm/test/Instrumentation/AddressSanitizer/instrument-dynamic-allocas.ll
index ceaf0e6fcfb..f6354b1ee59 100644
--- a/llvm/test/Instrumentation/AddressSanitizer/instrument-dynamic-allocas.ll
+++ b/llvm/test/Instrumentation/AddressSanitizer/instrument-dynamic-allocas.ll
@@ -7,8 +7,10 @@ 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 i8*
   store volatile i32 %len, i32* %0, align 4
@@ -19,3 +21,17 @@ entry:
   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, i32* %t
+  call void @pass_inalloca(i32* inalloca %t)
+  ret void
+}
+
+declare void @pass_inalloca(i32* inalloca)