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
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// Flags: --harmony-proxies

var proxy_has_x = false;
var proxy = new Proxy({}, { getPropertyDescriptor:function(key) {
  assertSame('x', key);
  if (proxy_has_x) {
    return { configurable:true, writable:false, value:19 };
  }
}});

// 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 = 23; }
f.prototype = proxy;
proxy_has_x = false;
assertSame(23, new f().x);
proxy_has_x = true;
assertSame(19, new f().x);

// Test inline constructors with proxy in prototype chain.
function g() { this.x = 42; }
g.prototype.__proto__ = proxy;
proxy_has_x = false;
assertSame(42, new g().x);
proxy_has_x = true;
assertSame(19, new g().x);