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// 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);
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