1 files changed, 72 insertions, 0 deletions
diff --git a/test/CodeGenCXX/microsoft-uuidof.cpp b/test/CodeGenCXX/microsoft-uuidof.cpp
new file mode 100644
index 000000000000..8eeb4490ac11
--- /dev/null
+++ b/test/CodeGenCXX/microsoft-uuidof.cpp
@@ -0,0 +1,72 @@
+// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-win32 -fms-extensions | FileCheck %s
+
+typedef struct _GUID
+{
+    unsigned long  Data1;
+    unsigned short Data2;
+    unsigned short Data3;
+    unsigned char  Data4[8];
+} GUID;
+
+struct __declspec(uuid("12345678-1234-1234-1234-1234567890ab")) S1 { } s1;
+struct __declspec(uuid("87654321-4321-4321-4321-ba0987654321")) S2 { };
+
+// This gets initialized in a static initializer.
+// CHECK: @g = global %struct._GUID zeroinitializer, align 4
+GUID g = __uuidof(S1);
+
+// First global use of __uuidof(S1) forces the creation of the global.
+// CHECK: @__uuid_12345678-1234-1234-1234-1234567890ab = private unnamed_addr constant %struct._GUID { i32 305419896, i16 4660, i16 4660, [8 x i8] c"\124\124Vx\90\AB" }
+// CHECK: @gr = constant %struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab, align 4
+const GUID& gr = __uuidof(S1);
+
+// CHECK: @gp = global %struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab, align 4
+const GUID* gp = &__uuidof(S1);
+
+// Special case: _uuidof(0)
+// CHECK: @zeroiid = constant %struct._GUID* @__uuid_00000000-0000-0000-0000-000000000000, align 4
+const GUID& zeroiid = __uuidof(0);
+
+// __uuidof(S2) hasn't been used globally yet, so it's emitted when it's used
+// in a function and is emitted at the end of the globals section.
+// CHECK: @__uuid_87654321-4321-4321-4321-ba0987654321 = private unnamed_addr constant %struct._GUID { i32 -2023406815, i16 17185, i16 17185, [8 x i8] c"C!\BA\09\87eC!" }
+
+// The static initializer for g.
+// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* bitcast (%struct._GUID* @g to i8*), i8* bitcast (%struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab to i8*), i32 16, i32 4, i1 false)
+
+void fun() {
+  // CHECK: %s1_1 = alloca %struct._GUID, align 4
+  // CHECK: %s1_2 = alloca %struct._GUID, align 4
+  // CHECK: %s1_3 = alloca %struct._GUID, align 4
+
+  // CHECK: [[U1:%.+]] = bitcast %struct._GUID* %s1_1 to i8*
+  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U1]], i8* bitcast (%struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab to i8*), i32 16, i32 4, i1 false)
+  GUID s1_1 = __uuidof(S1);
+
+  // CHECK: [[U2:%.+]] = bitcast %struct._GUID* %s1_2 to i8*
+  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U2]], i8* bitcast (%struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab to i8*), i32 16, i32 4, i1 false)
+  GUID s1_2 = __uuidof(S1);
+
+  // CHECK: [[U3:%.+]] = bitcast %struct._GUID* %s1_3 to i8*
+  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U3]], i8* bitcast (%struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab to i8*), i32 16, i32 4, i1 false)
+  GUID s1_3 = __uuidof(s1);
+}
+
+void gun() {
+  // CHECK: %s2_1 = alloca %struct._GUID, align 4
+  // CHECK: %s2_2 = alloca %struct._GUID, align 4
+  // CHECK: %r = alloca %struct._GUID*, align 4
+  // CHECK: %p = alloca %struct._GUID*, align 4
+  // CHECK: %zeroiid = alloca %struct._GUID*, align 4
+  GUID s2_1 = __uuidof(S2);
+  GUID s2_2 = __uuidof(S2);
+
+  // CHECK: store %struct._GUID* @__uuid_87654321-4321-4321-4321-ba0987654321, %struct._GUID** %r, align 4
+  const GUID& r = __uuidof(S2);
+  // CHECK: store %struct._GUID* @__uuid_87654321-4321-4321-4321-ba0987654321, %struct._GUID** %p, align 4
+  const GUID* p = &__uuidof(S2);
+
+  // Special case _uuidof(0), local scope version.
+  // CHECK: store %struct._GUID* @__uuid_00000000-0000-0000-0000-000000000000, %struct._GUID** %zeroiid, align 4
+  const GUID& zeroiid = __uuidof(0);
+}