src/v8/test/mjsunit/regress/readonly3.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//       notice, this list of conditions and the following disclaimer.
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//       with the distribution.
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//       contributors may be used to endorse or promote products derived
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//
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// "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,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

this.x = 0;

var p = {};
Object.defineProperty(p, "x", {writable:false, value:5});
this.__proto__ = p;

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

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

function c(p) {
  return {__proto__: p};
}

var o1 = c(this);
var o2 = c(this);

// Initialize the store IC.
s(c(this));
s(c(this));
s_strict(c(this));
s_strict(c(this));

delete this.x;

// Verify that direct setting fails.
o1.x = 20;
assertEquals(5, o1.x);

// Verify that setting through the IC fails.
s(o2);
assertEquals(5, o2.x);
assertThrows("s_strict(o2);", TypeError);