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

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