1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -fblocks %s -emit-llvm -o - | FileCheck %s -check-prefix=UNINIT
2 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -fblocks -ftrivial-auto-var-init=pattern %s -emit-llvm -o - | FileCheck %s -check-prefix=PATTERN
3 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -fblocks -ftrivial-auto-var-init=zero %s -emit-llvm -o - | FileCheck %s -check-prefix=ZERO
4 
5 template<typename T> void used(T &) noexcept;
6 
7 extern "C" {
8 
9 // UNINIT-LABEL:  test_attribute_uninitialized(
10 // UNINIT:      alloca
11 // UNINIT-NEXT: call void
12 // ZERO-LABEL:    test_attribute_uninitialized(
13 // ZERO:      alloca
14 // ZERO-NOT:  !annotation
15 // ZERO-NEXT: call void
16 // PATTERN-LABEL: test_attribute_uninitialized(
17 // PATTERN:      alloca
18 // PATTERN-NOT:  !annotation
19 // PATTERN-NEXT: call void
20 void test_attribute_uninitialized() {
21   [[clang::uninitialized]] int i;
22   used(i);
23 }
24 
25 #pragma clang attribute push([[clang::uninitialized]], apply_to = variable(is_local))
26 // UNINIT-LABEL:  test_pragma_attribute_uninitialized(
27 // UNINIT:      alloca
28 // UNINIT-NEXT: call void
29 // ZERO-LABEL:    test_pragma_attribute_uninitialized(
30 // ZERO:      alloca
31 // ZERO-NEXT: call void
32 // PATTERN-LABEL: test_pragma_attribute_uninitialized(
33 // PATTERN:      alloca
34 // PATTERN-NEXT: call void
35 void test_pragma_attribute_uninitialized() {
36   int i;
37   used(i);
38 }
39 #pragma clang attribute pop
40 
41 } // extern "C"
42