src/v8/test/mjsunit/regress/readonly5.js

// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

this.__proto__ = null;
this.x = 10;
delete this.x;

function s(v) {
  return v.x = 1;
}

function s_strict(v) {
  "use strict";
  return v.x = 1;
}

function c() {
  var o = {__proto__:this};
  return o;
}

var o1 = c();
var o2 = c();
var o1_strict = c();
var o2_strict = c();
var o3 = c();
var o4 = c();

// Initialize the store IC.
s(o1);
s(o2);
s_strict(o1_strict);
s_strict(o2_strict);

Object.defineProperty(this, "x", {writable:false, configurable:true});

// Verify that directly setting x fails.
o3.x = 1;
assertEquals(undefined, o3.x);

// Verify that setting x through the IC fails.
assertThrows("s_strict(o4)", TypeError);
s(o4);
assertEquals(undefined, o4.x);