The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/js/src/jit-test/tests/debug/Frame-arguments-06.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,38 @@
     1.4 +// Test extracting frame.arguments element getters and calling them in
     1.5 +// various awkward ways.
     1.6 +
     1.7 +load(libdir + "asserts.js");
     1.8 +
     1.9 +var g = newGlobal();
    1.10 +var dbg = Debugger(g);
    1.11 +var hits = 0;
    1.12 +var fframe, farguments, fgetter;
    1.13 +dbg.onDebuggerStatement = function (frame) {
    1.14 +    if (hits === 0) {
    1.15 +        fframe = frame;
    1.16 +        farguments = frame.arguments;
    1.17 +        fgetter = Object.getOwnPropertyDescriptor(farguments, "0").get;
    1.18 +        assertEq(fgetter instanceof Function, true);
    1.19 +
    1.20 +        // Calling the getter without an appropriate this-object
    1.21 +        // fails, but shouldn't assert or crash.
    1.22 +        assertThrowsInstanceOf(function () { fgetter.call(Math); }, TypeError);
    1.23 +    } else {
    1.24 +        // Since fframe is still on the stack, fgetter can be applied to it.
    1.25 +        assertEq(fframe.live, true);
    1.26 +        assertEq(fgetter.call(farguments), 100);
    1.27 +
    1.28 +        // Since h was called without arguments, there is no argument 0.
    1.29 +        assertEq(fgetter.call(frame.arguments), undefined);
    1.30 +    }
    1.31 +    hits++;
    1.32 +};
    1.33 +
    1.34 +g.eval("function h() { debugger; }");
    1.35 +g.eval("function f(x) { debugger; h(); }");
    1.36 +g.f(100);
    1.37 +assertEq(hits, 2);
    1.38 +
    1.39 +// Now that fframe is no longer live, trying to get its arguments should throw.
    1.40 +assertEq(fframe.live, false);
    1.41 +assertThrowsInstanceOf(function () { fgetter.call(farguments); }, Error);