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

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// Flags: --allow-natives-syntax

// Test loading a constant function on the prototype chain.

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

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

%PrepareFunctionForOptimization(get4);
assertEquals(4, get4(obj0)());
assertEquals(4, get4(obj0)());
%OptimizeFunctionOnNextCall(get4);
assertEquals(4, get4(obj0)());
obj4.f4 = function() { return 5; };
assertEquals(5, get4(obj0)());

function get3(obj) { return obj.f3; }

%PrepareFunctionForOptimization(get3);
assertEquals(3, get3(obj0)());
assertEquals(3, get3(obj0)());
%OptimizeFunctionOnNextCall(get3);
assertEquals(3, get3(obj0)());
obj2.f3 = function() { return 6; };
assertEquals(6, get3(obj0)());