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-rw-r--r--js/src/jit-test/tests/debug/Frame-arguments-06.js38
1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-arguments-06.js b/js/src/jit-test/tests/debug/Frame-arguments-06.js
new file mode 100644
index 000000000..3ce6f4695
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-arguments-06.js
@@ -0,0 +1,38 @@
+// Test extracting frame.arguments element getters and calling them in
+// various awkward ways.
+
+load(libdir + "asserts.js");
+
+var g = newGlobal();
+var dbg = Debugger(g);
+var hits = 0;
+var fframe, farguments, fgetter;
+dbg.onDebuggerStatement = function (frame) {
+ if (hits === 0) {
+ fframe = frame;
+ farguments = frame.arguments;
+ fgetter = Object.getOwnPropertyDescriptor(farguments, "0").get;
+ assertEq(fgetter instanceof Function, true);
+
+ // Calling the getter without an appropriate this-object
+ // fails, but shouldn't assert or crash.
+ assertThrowsInstanceOf(function () { fgetter.call(Math); }, TypeError);
+ } else {
+ // Since fframe is still on the stack, fgetter can be applied to it.
+ assertEq(fframe.live, true);
+ assertEq(fgetter.call(farguments), 100);
+
+ // Since h was called without arguments, there is no argument 0.
+ assertEq(fgetter.call(frame.arguments), undefined);
+ }
+ hits++;
+};
+
+g.eval("function h() { debugger; }");
+g.eval("function f(x) { debugger; h(); }");
+g.f(100);
+assertEq(hits, 2);
+
+// Now that fframe is no longer live, trying to get its arguments should throw.
+assertEq(fframe.live, false);
+assertThrowsInstanceOf(function () { fgetter.call(farguments); }, Error);