Require the containing type to be complete when we see
__alignof__ of a field.
This problem can only happen in C++11.
Also do some petty optimizations.
rdar://13784901
llvm-svn: 181185
diff --git a/clang/test/SemaCXX/alignof.cpp b/clang/test/SemaCXX/alignof.cpp
new file mode 100644
index 0000000..a9de1ad
--- /dev/null
+++ b/clang/test/SemaCXX/alignof.cpp
@@ -0,0 +1,52 @@
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
+
+// rdar://13784901
+
+struct S0 {
+ int x;
+ static const int test0 = __alignof__(x); // expected-error {{invalid application of 'alignof' to a field of a class still being defined}}
+ static const int test1 = __alignof__(S0::x); // expected-error {{invalid application of 'alignof' to a field of a class still being defined}}
+ auto test2() -> char(&)[__alignof__(x)]; // expected-error {{invalid application of 'alignof' to a field of a class still being defined}}
+};
+
+struct S1; // expected-note 5 {{forward declaration}}
+extern S1 s1;
+const int test3 = __alignof__(s1); // expected-error {{invalid application of 'alignof' to an incomplete type 'S1'}}
+
+struct S2 {
+ S2();
+ S1 &s;
+ int x;
+
+ int test4 = __alignof__(x); // ok
+ int test5 = __alignof__(s); // expected-error {{invalid application of 'alignof' to an incomplete type 'S1'}}
+};
+
+const int test6 = __alignof__(S2::x);
+const int test7 = __alignof__(S2::s); // expected-error {{invalid application of 'alignof' to an incomplete type 'S1'}}
+
+// Arguably, these should fail like the S1 cases do: the alignment of
+// 's2.x' should depend on the alignment of both x-within-S2 and
+// s2-within-S3 and thus require 'S3' to be complete. If we start
+// doing the appropriate recursive walk to do that, we should make
+// sure that these cases don't explode.
+struct S3 {
+ S2 s2;
+
+ static const int test8 = __alignof__(s2.x);
+ static const int test9 = __alignof__(s2.s); // expected-error {{invalid application of 'alignof' to an incomplete type 'S1'}}
+ auto test10() -> char(&)[__alignof__(s2.x)];
+ static const int test11 = __alignof__(S3::s2.x);
+ static const int test12 = __alignof__(S3::s2.s); // expected-error {{invalid application of 'alignof' to an incomplete type 'S1'}}
+ auto test13() -> char(&)[__alignof__(s2.x)];
+};
+
+// Same reasoning as S3.
+struct S4 {
+ union {
+ int x;
+ };
+ static const int test0 = __alignof__(x);
+ static const int test1 = __alignof__(S0::x);
+ auto test2() -> char(&)[__alignof__(x)];
+};