Objective-C++11: Support static_assert() in @interface/@implementation ivar lists and method declarations

This adds support for static_assert() (and _Static_assert()) in
@interface/@implementation ivar lists and in @interface method declarations.

It was already supported in @implementation blocks outside of the ivar lists.

The assert AST nodes are added at file scope, matching where other
(non-Objective-C) declarations at @interface / @implementation level go (cf
`allTUVariables`).

Also add a `__has_feature(objc_c_static_assert)` that's true in C11 (and
`__has_extension(objc_c_static_assert)` that's always true) and
`__has_feature(objc_cxx_static_assert)` that's true in C++11 modea fter this
patch, so it's possible to check if this is supported.

Differential Revision: https://reviews.llvm.org/D59223

llvm-svn: 356148

1 files changed, 74 insertions, 0 deletions

diff --git a/clang/test/Parser/objc-static-assert.mm b/clang/test/Parser/objc-static-assert.mm
new file mode 100644
index 00000000000..510340cde4b
--- /dev/null
+++ b/clang/test/Parser/objc-static-assert.mm
@@ -0,0 +1,74 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -Wno-objc-root-class %s
+// RUN: %clang_cc1 -std=c++98 -fsyntax-only -verify -Wno-objc-root-class %s
+
+#if !__has_feature(objc_c_static_assert)
+#error failed
+#endif
+
+#if __cplusplus >= 201103L
+
+#if !__has_feature(objc_cxx_static_assert)
+#error failed
+#endif
+
+// C++11
+
+@interface A {
+  int a;
+  static_assert(1, "");
+  _Static_assert(1, "");
+
+  static_assert(0, ""); // expected-error {{static_assert failed}}
+  _Static_assert(0, ""); // expected-error {{static_assert failed}}
+
+  static_assert(a, ""); // expected-error {{static_assert expression is not an integral constant expression}}
+  static_assert(sizeof(a) == 4, "");
+  static_assert(sizeof(a) == 3, ""); // expected-error {{static_assert failed}}
+}
+
+static_assert(1, "");
+_Static_assert(1, "");
+
+- (void)f;
+@end
+
+@implementation A {
+  int b;
+  static_assert(1, "");
+  _Static_assert(1, "");
+  static_assert(sizeof(b) == 4, "");
+  static_assert(sizeof(b) == 3, ""); // expected-error {{static_assert failed}}
+}
+
+static_assert(1, "");
+
+- (void)f {
+  static_assert(1, "");
+}
+@end
+
+@interface B
+@end
+
+@interface B () {
+  int b;
+  static_assert(sizeof(b) == 4, "");
+  static_assert(sizeof(b) == 3, ""); // expected-error {{static_assert failed}}
+}
+@end
+
+#else
+
+#if __has_feature(objc_cxx_static_assert)
+#error failed
+#endif
+
+// C++98
+@interface A {
+  int a;
+  static_assert(1, ""); // expected-error {{type name requires a specifier or qualifier}} expected-error{{expected parameter declarator}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  _Static_assert(1, "");
+  _Static_assert(0, ""); // expected-error {{static_assert failed}}
+}
+@end
+#endif