1 files changed, 71 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/regexp/lastIndex-non-writable.js b/js/src/jit-test/tests/regexp/lastIndex-non-writable.js
new file mode 100644
index 0000000000..74839762f5
--- /dev/null
+++ b/js/src/jit-test/tests/regexp/lastIndex-non-writable.js
@@ -0,0 +1,71 @@
+function testGlobalExec() {
+    var re = /abc.+de/g;
+    var c = 0;
+    for (var i = 0; i < 100; i++) {
+        re.lastIndex = 0;
+        if (i === 60) {
+            Object.freeze(re);
+        }
+        try {
+            re.exec("abcXdef");
+        } catch (e) {
+            assertEq(e.toString().includes("lastIndex"), true);
+            c++;
+        }
+        assertEq(re.lastIndex, i >= 60 ? 0 : 6);
+    }
+    assertEq(c, 40);
+}
+testGlobalExec();
+
+function testStickyTest() {
+    var re = /abc.+de/y;
+    var c = 0;
+    for (var i = 0; i < 100; i++) {
+        re.lastIndex = 0;
+        if (i === 60) {
+            Object.freeze(re);
+        }
+        try {
+            re.test("abcXdef");
+        } catch (e) {
+            assertEq(e.toString().includes("lastIndex"), true);
+            c++;
+        }
+        assertEq(re.lastIndex, i >= 60 ? 0 : 6);
+    }
+    assertEq(c, 40);
+}
+testStickyTest();
+
+// Must not reset too-large .lastIndex to 0 if non-writable.
+function testLastIndexOutOfRange() {
+    var re = /abc.+de/g;
+    re.lastIndex = 123;
+    Object.freeze(re);
+    for (var i = 0; i < 100; i++) {
+        var ex = null;
+        try {
+            re.exec("abcXdef");
+        } catch (e) {
+            ex = e;
+        }
+        assertEq(ex.toString().includes("lastIndex"), true);
+        assertEq(re.lastIndex, 123);
+    }
+}
+testLastIndexOutOfRange();
+
+// .lastIndex is ignored for non-global/non-sticky regexps.
+function testPlainExec() {
+    var re = /abc.+de/;
+    re.lastIndex = 1234;
+    for (var i = 0; i < 100; i++) {
+        if (i === 60) {
+            Object.freeze(re);
+        }
+        assertEq(re.exec("abcXdef")[0], "abcXde");
+        assertEq(re.lastIndex, 1234);
+    }
+}
+testPlainExec();