Remove a dead argument to ProcessUCNEscape.

Fix string concatenation to treat escapes in concatenated strings that
are wide because of other string chunks to process the escapes as wide
themselves.  Before we would warn about and miscompile the attached testcase.

This fixes rdar://8040728 - miscompile + warning: hex escape sequence out of range

llvm-svn: 106012

clang/lib/Lex/LiteralSupport.cpp

@@ -169,9 +169,8 @@ static unsigned ProcessCharEscape(const char *&ThisTokBuf,
 /// we will likely rework our support for UCN's.
 static void ProcessUCNEscape(const char *&ThisTokBuf, const char *ThisTokEnd,
                              char *&ResultBuf, bool &HadError,
-                             SourceLocation Loc, bool IsWide, Preprocessor &PP,
-                             bool Complain)
-{
+                             SourceLocation Loc, Preprocessor &PP,
+                             bool Complain) {
   // FIXME: Add a warning - UCN's are only valid in C++ & C99.
   // FIXME: Handle wide strings.
 
@@ -835,11 +834,8 @@ StringLiteralParser(const Token *StringToks, unsigned NumStringToks,
     // TODO: Input character set mapping support.
 
     // Skip L marker for wide strings.
-    bool ThisIsWide = false;
-    if (ThisTokBuf[0] == 'L') {
+    if (ThisTokBuf[0] == 'L')
       ++ThisTokBuf;
-      ThisIsWide = true;
-    }
 
     assert(ThisTokBuf[0] == '"' && "Expected quote, lexer broken?");
     ++ThisTokBuf;
@@ -884,14 +880,13 @@ StringLiteralParser(const Token *StringToks, unsigned NumStringToks,
       // Is this a Universal Character Name escape?
       if (ThisTokBuf[1] == 'u' || ThisTokBuf[1] == 'U') {
         ProcessUCNEscape(ThisTokBuf, ThisTokEnd, ResultPtr,
-                         hadError, StringToks[i].getLocation(), ThisIsWide, PP,
-                         Complain);
+                         hadError, StringToks[i].getLocation(), PP, Complain);
         continue;
       }
       // Otherwise, this is a non-UCN escape character.  Process it.
       unsigned ResultChar = ProcessCharEscape(ThisTokBuf, ThisTokEnd, hadError,
                                               StringToks[i].getLocation(),
-                                              ThisIsWide, PP, Complain);
+                                              AnyWide, PP, Complain);
 
       // Note: our internal rep of wide char tokens is always little-endian.
       *ResultPtr++ = ResultChar & 0xFF;

clang/test/SemaCXX/wchar_t.cpp

@@ -25,3 +25,8 @@ int t(void) {
   basic_string<wchar_t>() + L'-';
   return (0);
 }
+
+
+// rdar://8040728
+wchar_t in[] = L"\x434" "\x434";  // No warning
+