v8/test/mjsunit/compiler/array-length.js

// Copyright 2010 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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//
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// Flags: --allow-natives-syntax

function ArrayLength(a) { return a.length; }

function Test(a0, a2, a5) {
  assertEquals(0, ArrayLength(a0));
  assertEquals(2, ArrayLength(a2));
  assertEquals(5, ArrayLength(a5));
}

var a0 = [];
var a2 = [1,2];
var a5 = [1,2,3,4,5];

function MainTest() {
  %PrepareFunctionForOptimization(ArrayLength);
  for (var i = 0; i < 5; i++) Test(a0, a2, a5);
  %OptimizeFunctionOnNextCall(ArrayLength);
  Test(a0, a2, a5);
  %PrepareFunctionForOptimization(Test);
  %OptimizeFunctionOnNextCall(Test);
  Test(a0, a2, a5);
  assertEquals("undefined", typeof(ArrayLength(0)));
  %PrepareFunctionForOptimization(Test);
  for (var i = 0; i < 5; i++) Test(a0, a2, a5);
  %OptimizeFunctionOnNextCall(Test);
  Test(a0, a2, a5);
  assertEquals(4, ArrayLength("hest"));
}
MainTest();

// Packed
// Non-extensible, sealed, frozen
a0 = Object.preventExtensions([]);
a2 = Object.seal([1,'2']);
a5 = Object.freeze([1,2,'3',4,5]);
MainTest();

a0 = Object.seal([]);
a2 = Object.freeze([1,'2']);
a5 = Object.preventExtensions([1,2,'3',4,5]);
MainTest();

a0 = Object.freeze([]);
a2 = Object.preventExtensions([1,'2']);
a5 = Object.seal([1,2,'3',4,5]);
MainTest();

// Holey
// Non-extensible, sealed, frozen
a0 = Object.preventExtensions([]);
a2 = Object.seal([,'2']);
a5 = Object.freeze([,2,'3',4,5]);
MainTest();

a0 = Object.seal([]);
a2 = Object.freeze([,'2']);
a5 = Object.preventExtensions([,2,'3',4,5]);
MainTest();

a0 = Object.freeze([]);
a2 = Object.preventExtensions([,'2']);
a5 = Object.seal([,2,3,4,5]);
MainTest();