test/mjsunit/harmony/regress/regress-2225.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// 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
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//       with the distribution.
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//
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// 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,
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// 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.

// Flags: --harmony-proxies

var proxy_has_x = false;
var proxy = new Proxy({}, {
  get(t, key, receiver) {
    assertSame('x', key);
    if (proxy_has_x) { return 19 }
    return 8;
  }
});

// Test __lookupGetter__/__lookupSetter__ with proxy.
assertSame(undefined, Object.prototype.__lookupGetter__.call(proxy, 'foo'));
assertSame(undefined, Object.prototype.__lookupSetter__.call(proxy, 'bar'));
assertSame(undefined, Object.prototype.__lookupGetter__.call(proxy, '123'));
assertSame(undefined, Object.prototype.__lookupSetter__.call(proxy, '456'));

// Test __lookupGetter__/__lookupSetter__ with proxy in prototype chain.
var object = Object.create(proxy);
assertSame(undefined, Object.prototype.__lookupGetter__.call(object, 'foo'));
assertSame(undefined, Object.prototype.__lookupSetter__.call(object, 'bar'));
assertSame(undefined, Object.prototype.__lookupGetter__.call(object, '123'));
assertSame(undefined, Object.prototype.__lookupSetter__.call(object, '456'));

// Test inline constructors with proxy as prototype.
function F() { this.x = 42 }
F.prototype = proxy;
var instance = new F();

proxy_has_x = false;
assertSame(42, instance.x);
delete instance.x;
assertSame(8, instance.x);

proxy_has_x = true;
assertSame(19, instance.x);

// Test inline constructors with proxy in prototype chain.
function G() { this.x = 42; }
G.prototype.__proto__ = proxy;
instance = new G();

proxy_has_x = false;
assertSame(42, instance.x);
delete instance.x;
assertSame(8, instance.x);

proxy_has_x = true;
assertSame(19, instance.x);