User-defined literals: reject string and character UDLs in all places where the
grammar requires a string-literal and not a user-defined-string-literal. The
two constructs are still represented by the same TokenKind, in order to prevent
a combinatorial explosion of different kinds of token. A flag on Token tracks
whether a ud-suffix is present, in order to prevent clients from needing to look
at the token's spelling.
llvm-svn: 152098
diff --git a/clang/lib/Lex/PPExpressions.cpp b/clang/lib/Lex/PPExpressions.cpp
index c4ab143..8d8fe31 100644
--- a/clang/lib/Lex/PPExpressions.cpp
+++ b/clang/lib/Lex/PPExpressions.cpp
@@ -251,6 +251,10 @@
case tok::wide_char_constant: { // L'x'
case tok::utf16_char_constant: // u'x'
case tok::utf32_char_constant: // U'x'
+ // Complain about, and drop, any ud-suffix.
+ if (PeekTok.hasUDSuffix())
+ PP.Diag(PeekTok, diag::err_pp_invalid_char_udl);
+
SmallString<32> CharBuffer;
bool CharInvalid = false;
StringRef ThisTok = PP.getSpelling(PeekTok, CharBuffer, &CharInvalid);