michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: 
michael@0: /*
michael@0:  * Any copyright is dedicated to the Public Domain.
michael@0:  * http://creativecommons.org/licenses/publicdomain/
michael@0:  */
michael@0: 
michael@0: var out = {};
michael@0: 
michael@0: function arr() {
michael@0:   return Object.defineProperty([1, 2, 3, 4], 2, {configurable: false});
michael@0: }
michael@0: 
michael@0: function nonStrict1(out)
michael@0: {
michael@0:   var a = out.array = arr();
michael@0:   a.length = 2;
michael@0: }
michael@0: 
michael@0: function strict1(out)
michael@0: {
michael@0:   "use strict";
michael@0:   var a = out.array = arr();
michael@0:   a.length = 2;
michael@0:   return a;
michael@0: }
michael@0: 
michael@0: out.array = null;
michael@0: nonStrict1(out);
michael@0: assertEq(deepEqual(out.array, [1, 2, 3]), true);
michael@0: 
michael@0: out.array = null;
michael@0: try
michael@0: {
michael@0:   strict1(out);
michael@0:   throw "no error";
michael@0: }
michael@0: catch (e)
michael@0: {
michael@0:   assertEq(e instanceof TypeError, true, "expected TypeError, got " + e);
michael@0: }
michael@0: assertEq(deepEqual(out.array, [1, 2, 3]), true);
michael@0: 
michael@0: // Internally, SpiderMonkey has two representations for arrays:
michael@0: // fast-but-inflexible, and slow-but-flexible. Adding a non-index property
michael@0: // to an array turns it into the latter. We should test on both kinds.
michael@0: function addx(obj) {
michael@0:   obj.x = 5;
michael@0:   return obj;
michael@0: }
michael@0: 
michael@0: function nonStrict2(out)
michael@0: {
michael@0:   var a = out.array = addx(arr());
michael@0:   a.length = 2;
michael@0: }
michael@0: 
michael@0: function strict2(out)
michael@0: {
michael@0:   "use strict";
michael@0:   var a = out.array = addx(arr());
michael@0:   a.length = 2;
michael@0: }
michael@0: 
michael@0: out.array = null;
michael@0: nonStrict2(out);
michael@0: assertEq(deepEqual(out.array, addx([1, 2, 3])), true);
michael@0: 
michael@0: out.array = null;
michael@0: try
michael@0: {
michael@0:   strict2(out);
michael@0:   throw "no error";
michael@0: }
michael@0: catch (e)
michael@0: {
michael@0:   assertEq(e instanceof TypeError, true, "expected TypeError, got " + e);
michael@0: }
michael@0: assertEq(deepEqual(out.array, addx([1, 2, 3])), true);
michael@0: 
michael@0: if (typeof reportCompare === "function")
michael@0:   reportCompare(true, true);
michael@0: 
michael@0: print("Tests complete");