v8/test/mjsunit/compiler/pic.js

// Copyright 2010 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax

function GetX(o) { return o.x; }
function CallF(o) { return o.f(); }
function SetX(o) { o.x = 42; }
function SetXY(o,y) { return o.x = y; }


function Test(o) {
  SetX(o);
  assertEquals(42, GetX(o));
  assertEquals(87, SetXY(o, 87));
  assertEquals(87, GetX(o));
  assertTrue(SetXY(o, o) === o);
  assertTrue(o === GetX(o), "o === GetX(o)");
  assertEquals("hest", SetXY(o, "hest"));
  assertEquals("hest", GetX(o));
  assertTrue(SetXY(o, Test) === Test);
  assertTrue(Test === GetX(o), "Test === GetX(o)");
  assertEquals(99, CallF(o));
}

// Create a bunch of objects with different layouts.
var o1 = { x: 0, y: 1 };
var o2 = { y: 1, x: 0 };
var o3 = { y: 1, z: 2, x: 0 };
o1.f = o2.f = o3.f = function() { return 99; }

// Run the test until we're fairly sure we've optimized the
// polymorphic property access.
for (var i = 0; i < 5; i++) {
  Test(o1);
  Test(o2);
  Test(o3);
}
%OptimizeFunctionOnNextCall(Test);
Test(o1);
Test(o2);
Test(o3);

// Make sure that the following doesn't crash.
GetX(0);
SetX(0);
SetXY(0, 0);
assertThrows("CallF(0)", TypeError);