1 files changed, 45 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-this-09.js b/js/src/jit-test/tests/debug/Frame-this-09.js
new file mode 100644
index 0000000000..3ff6cc2a96
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-this-09.js
@@ -0,0 +1,45 @@
+// Ensure |Frame.this| returns the right value even if we're still in the
+// script's prologue, before JSOP_FUNCTIONTHIS.
+
+var g = newGlobal({newCompartment: true});
+var dbg = new Debugger(g);
+var hits = 0;
+dbg.onEnterFrame = function (frame) {
+    if (frame.type === 'eval')
+        return;
+    hits++;
+
+    var frameThis = frame.this;
+    if (frameThis !== null && typeof frameThis === "object")
+        g.gotThis = frameThis.unsafeDereference();
+    else
+        g.gotThis = frameThis;
+
+    assertEq(frame.this, frameThis, "getter should not return a different object");
+};
+
+// Strict mode, function uses |this|.
+g.eval("function strictfun() { 'use strict'; return this; }");
+g.eval("strictfun.call(Math); assertEq(gotThis, Math);");
+g.eval("strictfun.call(true); assertEq(gotThis, true);");
+g.eval("strictfun.call();     assertEq(gotThis, undefined);");
+
+// Strict mode, function doesn't use |this|.
+g.eval("function strictfunNoThis() { 'use strict'; }");
+g.eval("strictfunNoThis.call(Math); assertEq(gotThis, Math);");
+g.eval("strictfunNoThis.call(true); assertEq(gotThis, true);");
+g.eval("strictfunNoThis.call(null); assertEq(gotThis, null);");
+
+// Non-strict mode (primitive |this| is boxed), function uses |this|.
+g.eval("function nonstrictfun() { return this; }");
+g.eval("nonstrictfun.call(Math); assertEq(gotThis, Math);");
+g.eval("nonstrictfun.call(null); assertEq(gotThis, this);");
+g.eval("nonstrictfun.call();     assertEq(gotThis, this);");
+
+// Non-strict mode (primitive |this| is boxed), function doesn't use |this|.
+g.eval("function nonstrictfunNoThis() {}");
+g.eval("nonstrictfunNoThis.call(Math); assertEq(gotThis, Math);");
+g.eval("nonstrictfunNoThis.call(null); assertEq(gotThis, this);");
+g.eval("nonstrictfunNoThis.call();     assertEq(gotThis, this);");
+
+assertEq(hits, 12);