r260795 - Fix the ASTPrinter output for ascii char literals >127.

[Steven Watanabe via cfe-commits]

Author: steven_watanabe
Date: Fri Feb 12 20:31:28 2016
New Revision: 260795

URL: http://llvm.org/viewvc/llvm-project?rev=260795&view=rev
Log:
Fix the ASTPrinter output for ascii char literals >127.

Differential Revision: http://reviews.llvm.org/D17206

Modified:
    cfe/trunk/lib/AST/StmtPrinter.cpp
    cfe/trunk/test/Misc/ast-print-char-literal.cpp

Modified: cfe/trunk/lib/AST/StmtPrinter.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/StmtPrinter.cpp?rev=260795&r1=260794&r2=260795&view=diff
==============================================================================
--- cfe/trunk/lib/AST/StmtPrinter.cpp (original)
+++ cfe/trunk/lib/AST/StmtPrinter.cpp Fri Feb 12 20:31:28 2016
@@ -1250,6 +1250,12 @@ void StmtPrinter::VisitCharacterLiteral(
     OS << "'\\v'";
     break;
   default:
+    // A character literal might be sign-extended, which
+    // would result in an invalid \U escape sequence.
+    // FIXME: multicharacter literals such as '\xFF\xFF\xFF\xFF'
+    // are not correctly handled.
+    if ((value & ~0xFFu) == ~0xFFu && Node->getKind() == CharacterLiteral::Ascii)
+      value &= 0xFFu;
     if (value < 256 && isPrintable((unsigned char)value))
       OS << "'" << (char)value << "'";
     else if (value < 256)

Modified: cfe/trunk/test/Misc/ast-print-char-literal.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Misc/ast-print-char-literal.cpp?rev=260795&r1=260794&r2=260795&view=diff
==============================================================================
--- cfe/trunk/test/Misc/ast-print-char-literal.cpp (original)
+++ cfe/trunk/test/Misc/ast-print-char-literal.cpp Fri Feb 12 20:31:28 2016
@@ -13,6 +13,8 @@ void i() {
   h<u8'2'>();
 }
 
+char j = '\xFF';
+
 // CHECK: char c = u8'1';
 // CHECK-NEXT: char d = '1';
 // CHECK-NEXT: char e = U'1';
@@ -22,3 +24,4 @@ void i() {
 // CHECK: template <char c = u8'1'>
 
 // CHECK: h<u8'2'>();
+// CHECK: char j = '\xff';