1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-this-12.js b/js/src/jit-test/tests/debug/Frame-this-12.js
new file mode 100644
index 000000000..625fa9df5
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-this-12.js
@@ -0,0 +1,42 @@
+// Check evalInFrame("this") always returns the same object for a given frame.
+// Primitive this-values should not be boxed multiple times.
+
+var g = newGlobal();
+var dbg = new Debugger(g);
+var framesEntered = 0;
+var framesPopped = 0;
+var numSteps = 0;
+dbg.onEnterFrame = function (frame) {
+    if (frame.type === 'eval')
+        return;
+    framesEntered++;
+
+    var frameThis = frame.eval('this').return;
+
+    frame.onPop = function() {
+        framesPopped++;
+        assertEq(frame.eval('this').return, frameThis);
+    };
+
+    frame.onStep = function() {
+        numSteps++;
+        assertEq(frame.eval('this').return, frameThis);
+    }
+
+    g.gotThis = frameThis.unsafeDereference();
+    assertEq(frame.this, frameThis);
+};
+
+g.eval("function nonstrictfun() { return this; }");
+g.eval("nonstrictfun.call(Math); assertEq(gotThis, Math);");
+g.eval("nonstrictfun.call(true); assertEq(gotThis.valueOf(), true);");
+g.eval("nonstrictfun.call(); assertEq(gotThis, this);");
+
+g.eval("function nonstrictfunNoThis() { return 1; }");
+g.eval("nonstrictfunNoThis.call(Math); assertEq(gotThis, Math);");
+g.eval("nonstrictfunNoThis.call(true); assertEq(gotThis.valueOf(), true);");
+g.eval("nonstrictfunNoThis.call(); assertEq(gotThis, this);");
+
+assertEq(framesEntered, 6);
+assertEq(framesPopped, 6);
+assertEq(numSteps > 15, true);