Nicer display of unprintable source, and fix caret display for non-ascii text

Unprintable source in diagnostics is transformed to a printable form and then
displayed with reversed colors if possible. Unprintable characters are
displayed as <U+NNNN> while bytes that do not represent valid characters are
shown as <XX>.

Column adjustments to diagnostic carets, highlighted ranges, and fixups are
made both for characters escaped as above and for characters which are
printable but take up more than a single column.

llvm-svn: 154946

1 files changed, 16 insertions, 0 deletions

diff --git a/clang/test/Misc/wrong-encoding.c b/clang/test/Misc/wrong-encoding.c
new file mode 100644
index 00000000000..bd1cf3dc02a
--- /dev/null
+++ b/clang/test/Misc/wrong-encoding.c
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -fsyntax-only %s 2>&1 | FileCheck -strict-whitespace %s
+
+void foo() {
+
+  "§Ã"; // ø
+// CHECK: {{^  "<A7><C3>"; // <F8>}}
+// CHECK: {{^  \^}}
+
+  /* þ« */ const char *d = "¥";
+
+// CHECK: {{^  /\* <FE><AB> \*/ const char \*d = "<A5>";}}
+// CHECK: {{^                                 \^}}
+
+// CHECK: {{^  "<A7><C3>"; // <F8>}}
+// CHECK: {{^  \^~~~~~~~~~}}
+}