Teach the .ll parser to handle named metadata with non-simple names.

Unfortunately we can't follow what the rest of the language does (wrapping it
in double-quotes) because that would cause an ambiguity with metadata strings,
so instead we escape any unusual characters with \xx escaping.

llvm-svn: 133050

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index 014e81602d6..a363a653b21 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -422,13 +422,15 @@ static bool JustWhitespaceNewLine(const char *&Ptr) {
 ///    !
 lltok::Kind LLLexer::LexExclaim() {
   // Lex a metadata name as a MetadataVar.
-  if (isalpha(CurPtr[0])) {
+  if (isalpha(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
+      CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\') {
     ++CurPtr;
     while (isalnum(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
-           CurPtr[0] == '.' || CurPtr[0] == '_')
+           CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\')
       ++CurPtr;
 
     StrVal.assign(TokStart+1, CurPtr);   // Skip !
+    UnEscapeLexed(StrVal);
     return lltok::MetadataVar;
   }
   return lltok::exclaim;