v8/test/mjsunit/compare-objects.js

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

// Test CompareIC stubs for normal and strict equality comparison of known
// objects in hydrogen.

function lt(a, b) {
  return a < b;
}

function gt(a, b) {
  return a > b;
}

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

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

function test(a, b, less, greater) {
  // Check CompareIC for equality of known objects.
  assertTrue(eq(a, a));
  assertTrue(eq(b, b));
  assertFalse(eq(a, b));
  assertTrue(eq_strict(a, a));
  assertTrue(eq_strict(b, b));
  assertFalse(eq_strict(a, b));
  assertEquals(lt(a, b), less);
  assertEquals(gt(a, b), greater);
  assertEquals(lt(b, a), greater);
  assertEquals(gt(b, a), less);
}
%PrepareFunctionForOptimization(test);

var obj1 = {toString: function() {return "1";}};
var obj2 = {toString: function() {return "2";}};

var less = obj1 < obj2;
var greater = obj1 > obj2;

test(obj1, obj2, less, greater);
test(obj1, obj2, less, greater);
test(obj1, obj2, less, greater);
%OptimizeFunctionOnNextCall(test);
test(obj1, obj2, less, greater);
test(obj1, obj2, less, greater);

obj1.x = 1;
test(obj1, obj2, less, greater);

obj2.y = 2;
test(obj1, obj2, less, greater);

var obj1 = {test: 3};
var obj2 = {test2: 3};

var less = obj1 < obj2;
var greater = obj1 > obj2;

test(obj1, obj2, less, greater);
test(obj1, obj2, less, greater);
test(obj1, obj2, less, greater);
%PrepareFunctionForOptimization(test);
%OptimizeFunctionOnNextCall(test);
test(obj1, obj2, less, greater);
test(obj1, obj2, less, greater);

obj1.toString = function() {return "1"};
var less = obj1 < obj2;
var greater = obj1 > obj2;
test(obj1, obj2, less, greater);
%PrepareFunctionForOptimization(test);
%OptimizeFunctionOnNextCall(test);
test(obj1, obj2, less, greater);

obj2.toString = function() {return "2"};
var less = true;
var greater = false;

test(obj1, obj2, less, greater);
obj2.y = 2;
test(obj1, obj2, less, greater);