1 files changed, 37 insertions, 0 deletions
diff --git a/test/Frontend/source-col-map.c b/test/Frontend/source-col-map.c
new file mode 100644
index 000000000000..a14023bc82a8
--- /dev/null
+++ b/test/Frontend/source-col-map.c
@@ -0,0 +1,37 @@
+// RUN: not %clang_cc1 %s -fsyntax-only -fmessage-length 75 -o /dev/null 2>&1 | FileCheck %s -strict-whitespace
+
+// Test case for the text diagnostics source column conversion crash.
+
+// This test case tries to check the error diagnostic message printer, which is
+// responsible to create the code snippet shorter than the message-length (in
+// number of columns.)
+//
+// The error diagnostic message printer should be able to handle the non-ascii
+// characters without any segmentation fault or assertion failure.  If your
+// changes to clang frontend crashes this case, it is likely that you are mixing
+// column index with byte index which are two totally different concepts.
+
+// NOTE: This file is encoded in UTF-8 and intentionally contains some
+// non-ASCII characters.
+
+__attribute__((format(printf, 1, 2)))
+extern int printf(const char *fmt, ...);
+
+void test1(Unknown* b);  // αααα αααα αααα αααα αααα αααα αααα αααα αααα αααα αααα
+// CHECK: unknown type name 'Unknown'
+// CHECK-NEXT: void test1(Unknown* b);  // αααα αααα αααα αααα αααα αααα αααα ααα...
+// CHECK-NEXT: {{^           \^$}}
+
+void test2(Unknown* b);  // αααα αααα αααα αααα αααα αααα αααα αααα αααα
+
+// CHECK: unknown type name 'Unknown'
+// CHECK-NEXT: void test2(Unknown* b);  // αααα αααα αααα αααα αααα αααα αααα αααα αααα
+// CHECK-NEXT: {{^           \^$}}
+
+void test3() {
+   /* αααα αααα αααα αααα αααα αααα αααα αααα αααα αααα */ printf("%d", "s");
+}
+// CHECK:       format specifies type 'int' but the argument has type 'char *'
+// CHECK-NEXT:   ...αααα αααα αααα αααα αααα αααα αααα αααα αααα */ printf("%d", "s");
+// CHECK-NEXT: {{^                                                             ~~   \^~~$}}
+// CHECK-NEXT: {{^                                                             %s$}}