node/deps/v8/test/mjsunit/compare-known-objects.js

// Copyright 2012 the V8 project authors. All rights reserved.
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//
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// Flags: --allow-natives-syntax

// Test CompareIC stubs for normal and strict equality comparison of known
// objects in slow mode. These objects share the same map even though they
// might have completely different properties.

function eq(a, b) {
  return a == b;
}

function eq_strict(a, b) {
  return a === b;
}

function test(a, b) {
  // Check CompareIC for equality of known objects.
  assertTrue(eq(a, a));
  assertTrue(eq(b, b));
  assertFalse(eq(a, b));
  // Check CompareIC for strict equality of known objects.
  assertTrue(eq_strict(a, a));
  assertTrue(eq_strict(b, b));
  assertFalse(eq_strict(a, b));
}

function O(){};
O.prototype.t = function() {}

var obj1 = new O;
var obj2 = new O;

// Test original objects.
assertTrue(%HaveSameMap(obj1, obj2));
test(obj1, obj2);

// Test after adding property to first object.
obj1.x = 1;
test(obj1, obj2);