1 files changed, 67 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/regexp/non-unicode-case-folding-backreference.js b/js/src/jit-test/tests/regexp/non-unicode-case-folding-backreference.js
new file mode 100644
index 0000000000..bfea5f89a9
--- /dev/null
+++ b/js/src/jit-test/tests/regexp/non-unicode-case-folding-backreference.js
@@ -0,0 +1,67 @@
+// |jit-test| skip-if: typeof Intl === 'undefined'
+
+// See https://tc39.es/ecma262/#sec-runtime-semantics-canonicalize-ch
+function Canonicalize(ch) {
+  var u = ch.toUpperCase();
+  if (u.length > 1) return ch;
+  var cu = u.charCodeAt(0);
+  if (ch.charCodeAt(0) >= 128 && cu < 128) return ch;
+  return cu;
+}
+
+function TestEquivalenceClass(eclass) {
+  var backref = /(.)\1/i;
+
+  for (var i = 0; i < eclass.length; i++) {
+    for (var j = 0; j < eclass.length; j++) {
+      if (i == j) continue;
+      var c1 = eclass[i];
+      var c2 = eclass[j];
+      var cc = c1 + c2;
+      var shouldMatch = Canonicalize(c1) === Canonicalize(c2);
+
+      assertEq(backref.test(cc), shouldMatch);
+    }
+  }
+}
+
+function TestAll() {
+  for (var eclass of equivalence_classes) {
+    TestEquivalenceClass(eclass);
+  }
+}
+
+// Interesting case-folding equivalence classes (as determined by
+// ICU's UnicodeSet::closeOver). A class is interesting if it contains
+// more than two characters, or if it contains any characters in
+// IgnoreSet or SpecialAddSet as defined in new-regexp/special-case.h.
+var equivalence_classes = [
+  '\u0041\u0061',              // Aa (sanity check)
+  '\u004b\u006b\u212a',        // KkK
+  '\u0053\u0073\u017f',        // Ssſ
+  '\u00b5\u039c\u03bc',        // µΜμ
+  '\u00c5\u00e5\u212b',        // ÅåÅ
+  '\u00df\u1e9e',              // ßẞ
+  '\u03a9\u03c9\u2126',        // ΩωΩ
+  '\u0390\u1fd3',              // ΐΐ
+  '\u0398\u03b8\u03d1\u03f4',  // Θθϑϴ
+  '\u03b0\u1fe3',              // ΰΰ
+  '\u1f80\u1f88',              // ᾀᾈ
+  '\u1fb3\u1fbc',              // ᾳᾼ
+  '\u1fc3\u1fcc',              // ῃῌ
+  '\u1ff3\u1ffc',              // ῳῼ
+  '\ufb05\ufb06',              // ﬅﬆ
+
+  // Everything below this line is a well-behaved case-folding
+  // equivalence class with more than two characters but only one
+  // canonical case-folded character
+  '\u01c4\u01c5\u01c6', '\u01c7\u01c8\u01c9', '\u01ca\u01cb\u01cc',
+  '\u01f1\u01f2\u01f3', '\u0345\u0399\u03b9\u1fbe', '\u0392\u03b2\u03d0',
+  '\u0395\u03b5\u03f5', '\u039a\u03ba\u03f0', '\u03a0\u03c0\u03d6',
+  '\u03a1\u03c1\u03f1', '\u03a3\u03c2\u03c3', '\u03a6\u03c6\u03d5',
+  '\u0412\u0432\u1c80', '\u0414\u0434\u1c81', '\u041e\u043e\u1c82',
+  '\u0421\u0441\u1c83', '\u0422\u0442\u1c84\u1c85', '\u042a\u044a\u1c86',
+  '\u0462\u0463\u1c87', '\u1c88\ua64a\ua64b', '\u1e60\u1e61\u1e9b'
+];
+
+TestAll();