Object-apply-02.js

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// tests calling native functions via Debugger.Object.prototype.apply/call

load(libdir + "asserts.js");

var g = newGlobal({newCompartment: true});

g.eval("function f() { debugger; }");

var dbg = new Debugger(g);

function test(usingApply) {

    dbg.onDebuggerStatement = function (frame) {

        var max = frame.arguments[0];

        var cv = usingApply ? max.apply(null, [9, 16]) : max.call(null, 9, 16);

        assertEq(cv.return, 16);

        cv = usingApply ? max.apply() : max.call();

        assertEq(cv.return, -1/0);

        cv = usingApply ? max.apply(null, [2, 5, 3, 8, 1, 9, 4, 6, 7])

                        : max.call(null, 2, 5, 3, 8, 1, 9, 4, 6, 7);

        assertEq(cv.return, 9);

        // second argument to apply must be an array

        assertThrowsInstanceOf(function () { max.apply(null, 12); }, TypeError);

};

    g.eval("f(Math.max);");

    dbg.onDebuggerStatement = function (frame) {

        var push = frame.arguments[0];

        var arr = frame.arguments[1];

        var cv;

        cv = usingApply ? push.apply(arr, [0, 1, 2]) : push.call(arr, 0, 1, 2);

        assertEq(cv.return, 3);

        cv = usingApply ? push.apply(arr, [arr]) : push.call(arr, arr);

        assertEq(cv.return, 4);

        cv = usingApply ? push.apply(arr) : push.call(arr);

        assertEq(cv.return, 4);

        // You can apply Array.prototype.push to a string; it does ToObject on

        // it.  But as the length property on String objects is non-writable,

        // attempting to increase the length will throw a TypeError.

        cv = usingApply

             ? push.apply("hello", ["world"])

             : push.call("hello", "world");

        assertEq("throw" in cv, true);

        var ex = cv.throw;

        assertEq(frame.evalWithBindings("ex instanceof TypeError", { ex: ex }).return, true);

};

    g.eval("var a = []; f(Array.prototype.push, a);");

    assertEq(g.a.length, 4);

    assertEq(g.a.slice(0, 3).join(","), "0,1,2");

    assertEq(g.a[3], g.a);

test(true);

test(false);