1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/surfaces-offsets.js b/js/src/jit-test/tests/debug/surfaces-offsets.js
new file mode 100644
index 0000000000..418361a924
--- /dev/null
+++ b/js/src/jit-test/tests/debug/surfaces-offsets.js
@@ -0,0 +1,37 @@
+// Invalid offsets result in exceptions, not bogus results.
+
+load(libdir + "asserts.js");
+
+var g = newGlobal({newCompartment: true});
+var dbg = Debugger(g);
+var hits;
+dbg.onDebuggerStatement = function (frame) {
+    assertEq(frame.script.getOffsetLocation(frame.offset).lineNumber, g.line);
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(String(frame.offset)).lineNumber; }, Error);
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(Object(frame.offset)).lineNumber; }, Error);
+
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(-1).lineNumber; }, Error);
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(1000000).lineNumber; }, Error);
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(0.25).lineNumber; }, Error);
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(+Infinity).lineNumber; }, Error);
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(-Infinity).lineNumber; }, Error);
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(NaN).lineNumber; }, Error);
+
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(false).lineNumber; }, Error);
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(true).lineNumber; }, Error);
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation(undefined).lineNumber; }, Error);
+    assertThrowsInstanceOf(function () { frame.script.getOffsetLocation().lineNumber; }, Error);
+
+    // We assume that at least one whole number between 0 and frame.offset is invalid.
+    assertThrowsInstanceOf(
+        function () {
+            for (var i = 0; i < frame.offset; i++)
+                frame.script.getOffsetLocation(i).lineNumber;
+        },
+        Error);
+
+    hits++;
+};
+
+hits = 0;
+g.eval("var line = new Error().lineNumber; debugger;");