src/v8/test/mjsunit/bugs/bug-1344252.js

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// Test that setter accessors added to the prototype chain are called
// when setting properties.

// Test that accessors added to the prototype chain are called
// eventhough there are inline caches for setting the property

function F() {
  this.x = 42;
  this.y = 87;
}

// Force the inline caches to monomorphic state.
new F(); new F();

// Add a setter for x to Object.prototype and make sure it gets
// called.
var result_x;
Object.prototype.__defineSetter__('x', function(value) { result_x = value; });
var f = new F();
assertEquals(42, result_x);
assertTrue(typeof f.x == 'undefined');

// Add a setter for y by changing the prototype of f and make sure
// that gets called too.
var result_y;
var proto = new Object();
proto.__defineSetter__('y', function (value) { result_y = value; });
var f = new F();
f.y = undefined;
f.__proto__ = proto;
F.call(f);
assertEquals(87, result_y);
assertTrue(typeof f.y == 'undefined');


// Test the same issue in the runtime system.  Make sure that
// accessors added to the prototype chain are called instead of
// following map transitions.
//
// Create two objects.
var result_z;
var o1 = new Object();
var o2 = new Object();
// Add a z property to o1 to create a map transition.
o1.z = 32;
// Add a z accessor in the prototype chain for o1 and o2.
Object.prototype.__defineSetter__('z', function(value) { result_z = value; });
// The accessor should be called for o2.
o2.z = 27;
assertEquals(27, result_z);
assertTrue(typeof o2.z == 'undefined');