1 files changed, 122 insertions, 0 deletions
diff --git a/clang/test/Parser/c2x-attributes.c b/clang/test/Parser/c2x-attributes.c
new file mode 100644
index 00000000000..1be69f1ca28
--- /dev/null
+++ b/clang/test/Parser/c2x-attributes.c
@@ -0,0 +1,122 @@
+// RUN: %clang_cc1 -fsyntax-only -fdouble-square-bracket-attributes -verify %s
+
+enum [[]] E {
+  One [[]],
+  Two,
+  Three [[]]
+};
+
+enum [[]] { Four };
+[[]] enum E2 { Five }; // expected-error {{an attribute list cannot appear here}}
+
+// FIXME: this diagnostic can be improved.
+enum { [[]] Six }; // expected-error {{expected identifier}}
+
+// FIXME: this diagnostic can be improved.
+enum E3 [[]] { Seven }; // expected-error {{expected identifier or '('}}
+
+struct [[]] S1 {
+  int i [[]];
+  int [[]] j;
+  int k[10] [[]];
+  int l[[]][10];
+  [[]] int m, n;
+  int o [[]] : 12;
+};
+
+[[]] struct S2 { int a; }; // expected-error {{an attribute list cannot appear here}}
+struct S3 [[]] { int a; }; // expected-error {{an attribute list cannot appear here}}
+
+union [[]] U {
+  double d [[]];
+  [[]] int i;
+};
+
+[[]] union U2 { double d; }; // expected-error {{an attribute list cannot appear here}}
+union U3 [[]] { double d; }; // expected-error {{an attribute list cannot appear here}}
+
+struct [[]] IncompleteStruct;
+union [[]] IncompleteUnion;
+enum [[]] IncompleteEnum;
+enum __attribute__((deprecated)) IncompleteEnum2;
+
+[[]] void f1(void);
+void [[]] f2(void);
+void f3 [[]] (void);
+void f4(void) [[]];
+
+void f5(int i [[]], [[]] int j, int [[]] k);
+
+void f6(a, b) [[]] int a; int b; { // expected-error {{an attribute list cannot appear here}}
+}
+
+// FIXME: technically, an attribute list cannot appear here, but we currently
+// parse it as part of the return type of the function, which is reasonable
+// behavior given that we *don't* want to parse it as part of the K&R parameter
+// declarations. It is disallowed to avoid a parsing ambiguity we already
+// handle well.
+int (*f7(a, b))(int, int) [[]] int a; int b; {
+  return 0;
+}
+
+[[]] int a, b;
+int c [[]], d [[]];
+
+void f8(void) [[]] {
+  [[]] int i, j;
+  int k, l [[]];
+}
+
+[[]] void f9(void) {
+  int i[10] [[]];
+  int (*fp1)(void)[[]];
+  int (*fp2 [[]])(void);
+
+  int * [[]] *ipp;
+}
+
+void f10(int j[static 10] [[]], int k[*] [[]]);
+
+void f11(void) {
+  [[]] {}
+  [[]] if (1) {}
+
+  [[]] switch (1) {
+  [[]] case 1: [[]] break;
+  [[]] default: break;
+  }
+
+  goto foo;
+  [[]] foo: (void)1;
+
+  [[]] for (;;);
+  [[]] while (1);
+  [[]] do [[]] { } while(1);
+
+  [[]] (void)1;
+
+  [[]];
+
+  (void)sizeof(int [4][[]]);
+  (void)sizeof(struct [[]] S3 { int a [[]]; });
+
+  [[]] return;
+}
+
+[[attr]] void f12(void); // expected-warning {{unknown attribute 'attr' ignored}}
+[[vendor::attr]] void f13(void); // expected-warning {{unknown attribute 'attr' ignored}}
+
+// Ensure that asm statements properly handle double colons.
+void test_asm(void) {
+  asm("ret" :::);
+  asm("foo" :: "r" (xx)); // expected-error {{use of undeclared identifier 'xx'}}
+}
+
+// Do not allow 'using' to introduce vendor attribute namespaces.
+[[using vendor: attr1, attr2]] void f14(void); // expected-error {{expected ']'}} \
+                                               // expected-warning {{unknown attribute 'vendor' ignored}} \
+                                               // expected-warning {{unknown attribute 'using' ignored}}
+
+struct [[]] S4 *s; // expected-error {{an attribute list cannot appear here}}
+struct S5 {};
+int c = sizeof(struct [[]] S5); // expected-error {{an attribute list cannot appear here}}