Properly validate UCNs for C99 and C++03 (both more restrictive than C(++)11).

Add warnings under -Wc++11-compat, -Wc++98-compat, and -Wc99-compat when a
particular UCN is incompatible with a different standard, and -Wunicode when
a UCN refers to a surrogate character in C++03.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174788 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 68 insertions, 0 deletions

diff --git a/test/Preprocessor/utf8-allowed-chars.c b/test/Preprocessor/utf8-allowed-chars.c
new file mode 100644
index 0000000000..b10ca74376
--- /dev/null
+++ b/test/Preprocessor/utf8-allowed-chars.c
@@ -0,0 +1,68 @@
+// RUN: %clang_cc1 %s -fsyntax-only -std=c99 -verify
+// RUN: %clang_cc1 %s -fsyntax-only -std=c11 -Wc99-compat -verify
+// RUN: %clang_cc1 %s -fsyntax-only -x c++ -std=c++03 -Wc++11-compat -verify
+// RUN: %clang_cc1 %s -fsyntax-only -x c++ -std=c++11 -Wc++98-compat -verify
+
+// Note: This file contains Unicode characters; please do not remove them!
+
+// Identifier characters
+extern char aǶ; // C11, C++11
+extern char aª; // C99, C11, C++11
+extern char a΄; // C++03, C11, C++11
+extern char a๐; // C99, C++03, C11, C++11
+extern char a﹅; // none
+extern char x̀; // C11, C++11. Note that this does not have a composed form.
+
+
+
+
+// Identifier initial characters
+extern char ๐; // C++03, C11, C++11
+extern char ̀; // disallowed initially in C11/C++11, always in C99/C++03
+
+
+
+
+
+
+
+
+#if __cplusplus
+# if __cplusplus >= 201103L
+// C++11
+// expected-warning@9 {{using this character in an identifier is incompatible with C++98}}
+// expected-warning@10 {{using this character in an identifier is incompatible with C++98}}
+// expected-error@13 {{non-ASCII characters are not allowed outside of literals and identifiers}}
+// expected-warning@14 {{using this character in an identifier is incompatible with C++98}}
+// expected-error@21 {{expected unqualified-id}}
+
+# else
+// C++03
+// expected-error@9 {{non-ASCII characters are not allowed outside of literals and identifiers}}
+// expected-error@10 {{non-ASCII characters are not allowed outside of literals and identifiers}}
+// expected-error@13 {{non-ASCII characters are not allowed outside of literals and identifiers}}
+// expected-error@14 {{non-ASCII characters are not allowed outside of literals and identifiers}}
+// expected-error@21 {{non-ASCII characters are not allowed outside of literals and identifiers}} expected-warning@21 {{declaration does not declare anything}}
+
+# endif
+#else
+# if __STDC_VERSION__ >= 201112L
+// C11
+// expected-warning@9 {{using this character in an identifier is incompatible with C99}}
+// expected-warning@11 {{using this character in an identifier is incompatible with C99}}
+// expected-error@13 {{non-ASCII characters are not allowed outside of literals and identifiers}}
+// expected-warning@14 {{using this character in an identifier is incompatible with C99}}
+// expected-warning@20 {{starting an identifier with this character is incompatible with C99}}
+// expected-error@21 {{expected identifier}}
+
+# else
+// C99
+// expected-error@9 {{non-ASCII characters are not allowed outside of literals and identifiers}}
+// expected-error@11 {{non-ASCII characters are not allowed outside of literals and identifiers}}
+// expected-error@13 {{non-ASCII characters are not allowed outside of literals and identifiers}}
+// expected-error@14 {{non-ASCII characters are not allowed outside of literals and identifiers}}
+// expected-error@20 {{expected identifier}}
+// expected-error@21 {{non-ASCII characters are not allowed outside of literals and identifiers}} expected-warning@21 {{declaration does not declare anything}}
+
+# endif
+#endif