--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/CodeGenObjC/protocols.m	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,73 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -o - %s | FileCheck %s
+
+// CHECK: @"_OBJC_$_PROTOCOL_METHOD_TYPES_P1" = internal global
+// CHECK: @[[PROTO_P1:"_OBJC_PROTOCOL_\$_P1"]] = weak hidden
+// CHECK: @[[LABEL_PROTO_P1:"_OBJC_LABEL_PROTOCOL_\$_P1"]] = weak hidden global %{{.*}}* @[[PROTO_P1]]
+// CHECK: @[[PROTO_P2:"_OBJC_PROTOCOL_\$_P2"]] = weak hidden
+// CHECK: @[[LABEL_PROTO_P2:"_OBJC_LABEL_PROTOCOL_\$_P2"]] = weak hidden global %{{.*}}* @[[PROTO_P2]]
+// CHECK: @"_OBJC_$_PROTOCOL_REFS_P3" = internal global { i64, [3 x %{{.*}}] } { i64 2, [3 x %{{.*}}*] [%{{.*}}* @[[PROTO_P1]], %{{.*}}* @[[PROTO_P2]], %{{.*}}* null] }
+// CHECK: @[[PROTO_P3:"_OBJC_PROTOCOL_\$_P3"]] = weak hidden
+// CHECK: @[[LABEL_PROTO_P3:"_OBJC_LABEL_PROTOCOL_\$_P3"]] = weak hidden global %{{.*}}* @[[PROTO_P3]]
+// CHECK: "_OBJC_PROTOCOL_REFERENCE_$_P3" = weak hidden global %{{.*}}* bitcast (%{{.*}}* @[[PROTO_P3]] to %{{.*}}*)
+// CHECK: @[[PROTO_P0:"_OBJC_PROTOCOL_\$_P0"]] = weak hidden
+// CHECK: @[[LABEL_PROTO_P0:"_OBJC_LABEL_PROTOCOL_\$_P0"]] = weak hidden global %{{.*}}* @[[PROTO_P0]]
+// CHECK: "_OBJC_PROTOCOL_REFERENCE_$_P0" = weak hidden global %0* bitcast (%{{.*}}* @[[PROTO_P0]] to %{{.*}}*)
+// CHECK: "_OBJC_PROTOCOL_REFERENCE_$_P1" = weak hidden global %0* bitcast (%{{.*}}* @[[PROTO_P1]] to %{{.*}}*)
+// CHECK: "_OBJC_PROTOCOL_REFERENCE_$_P2" = weak hidden global %0* bitcast (%{{.*}}* @[[PROTO_P2]] to %{{.*}}*)
+
+void p(const char*, ...);
+
+@interface Root
++(int) maxValue;
+-(int) conformsTo: (id) x;
+@end
+
+@protocol P0
+@end
+
+@protocol P1
++(void) classMethodReq0;
+-(void) methodReq0;
+@optional
++(void) classMethodOpt1;
+-(void) methodOpt1;
+@required
++(void) classMethodReq2;
+-(void) methodReq2;
+@end
+
+@protocol P2
+//@property(readwrite) int x;
+@end
+
+@protocol P3<P1, P2>
+-(id <P1>) print0;
+-(void) print1;
+@end
+
+void foo(const id a) {
+  void *p = @protocol(P3);
+}
+
+int main() {
+  Protocol *P0 = @protocol(P0);
+  Protocol *P1 = @protocol(P1);
+  Protocol *P2 = @protocol(P2);
+  Protocol *P3 = @protocol(P3);
+
+#define Pbool(X) p(#X ": %s\n", X ? "yes" : "no");
+  Pbool([P0 conformsTo: P1]);
+  Pbool([P1 conformsTo: P0]);
+  Pbool([P1 conformsTo: P2]);
+  Pbool([P2 conformsTo: P1]);
+  Pbool([P3 conformsTo: P1]);
+  Pbool([P1 conformsTo: P3]);
+
+  return 0;
+}
+
+// rdar://problem/7992749
+typedef Root<P1> P1Object;
+int test10() {
+  return [P1Object maxValue];
+}