v8/test/mjsunit/array-push-unshift-read-only-length.js

108 lines
2.1 KiB
JavaScript

// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax
function test(mode) {
var a = [];
Object.defineProperty(a, "length", { writable : false});
function check(f) {
try {
f(a);
} catch(e) { }
assertFalse(0 in a);
assertEquals(0, a.length);
}
function push(a) {
a.push(3);
}
if (mode == "fast properties") %ToFastProperties(a);
check(push);
check(push);
check(push);
%OptimizeFunctionOnNextCall(push);
check(push);
function unshift(a) {
a.unshift(3);
}
check(unshift);
check(unshift);
check(unshift);
%OptimizeFunctionOnNextCall(unshift);
check(unshift);
}
test("fast properties");
test("normalized");
var b = [];
Object.defineProperty(b.__proto__, "0", {
set : function(v) {
b.x = v;
Object.defineProperty(b, "length", { writable : false });
},
get: function() {
return b.x;
}
});
b = [];
try {
b.push(3, 4, 5);
} catch(e) { }
assertFalse(1 in b);
assertFalse(2 in b);
assertEquals(0, b.length);
b = [];
try {
b.unshift(3, 4, 5);
} catch(e) { }
assertFalse(1 in b);
assertFalse(2 in b);
assertEquals(0, b.length);
b = [1, 2];
try {
b.unshift(3, 4, 5);
} catch(e) { }
assertEquals(3, b[0]);
assertEquals(4, b[1]);
assertEquals(5, b[2]);
assertEquals(1, b[3]);
assertEquals(2, b[4]);
assertEquals(5, b.length);
b = [1, 2];
Object.defineProperty(b.__proto__, "4", {
set : function(v) {
b.z = v;
Object.defineProperty(b, "length", { writable : false });
},
get: function() {
return b.z;
}
});
try {
b.unshift(3, 4, 5);
} catch(e) { }
// TODO(ulan): According to the ECMA-262 unshift should throw an exception
// when moving b[0] to b[3] (see 15.4.4.13 step 6.d.ii). This is difficult
// to do with our current implementation of SmartMove() in src/array.js and
// it will regress performance. Uncomment the following line once acceptable
// solution is found:
// assertFalse(2 in b);
// assertFalse(3 in b);
// assertEquals(2, b.length);