Frame-arguments-01.js

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// Frame.prototype.arguments with primitive values

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

g.args = null;

var dbg = new Debugger(g);

var hits;

var v;

dbg.onDebuggerStatement = function (frame) {

    hits++;

    var args = frame.arguments;

    assertEq(args instanceof Array, true);

    assertEq(Array.isArray(args), false);

    assertEq(args, frame.arguments);

    assertEq(args.length, g.args.length);

    for (var i = 0; i < args.length; i++)

        assertEq(args[i], g.args[i]);

};

// no formal parameters

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

hits = 0;

g.eval("args = []; f();");

g.eval("this.f();");

g.eval("var world = Symbol('world'); " +

       "args = ['hello', world, 3.14, true, false, null, undefined]; " +

       "f('hello', world, 3.14, true, false, null, undefined);");

g.eval("f.apply(undefined, args);");

g.eval("args = [-0, NaN, -1/0]; this.f(-0, NaN, -1/0);");

assertEq(hits, 5);

// with formal parameters

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

hits = 0;

g.eval("args = []; f();");

g.eval("this.f();");

g.eval("args = ['a', 'b']; f('a', 'b');");

g.eval("this.f('a', 'b');");

g.eval("f.bind(null, 'a')('b');");

assertEq(hits, 5);