v8/test/mjsunit/compiler/proto-chain-load.js

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// Flags: --allow-natives-syntax

// Test HLoadNamedField on the proto chain.

var obj4 = Object.create(null, { f4: {value: 4} });
var obj3 = Object.create(obj4, { f3: {value: 3} });
var obj2 = Object.create(obj3, { f2: {value: 2} });
var obj1 = Object.create(obj2, { f1: {value: 1} });
var obj0 = Object.create(obj1, { f0: {value: 0} });

function get4(obj) { return obj.f4; }

%PrepareFunctionForOptimization(get4);
assertEquals(4, get4(obj0));
assertEquals(4, get4(obj0));
%OptimizeFunctionOnNextCall(get4);
assertEquals(4, get4(obj0));
assertEquals(4, get4(obj0));