v8/test/mjsunit/omit-constant-mapcheck.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//     * Redistributions in binary form must reproduce the above
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// Flags: --allow-natives-syntax

var g1 = {a: 1};

function load() {
  return g1.a;
};
%PrepareFunctionForOptimization(load);
assertEquals(1, load());
assertEquals(1, load());
%OptimizeFunctionOnNextCall(load);
assertEquals(1, load());
delete g1.a;
assertEquals(undefined, load());

var g2 = {a: 2};

function load2() {
  return g2.a;
};
%PrepareFunctionForOptimization(load2);
assertEquals(2, load2());
assertEquals(2, load2());
%OptimizeFunctionOnNextCall(load2);
assertEquals(2, load2());
g2.b = 10;
g2.a = 5;
assertEquals(5, load2());

var g3 = {a: 2, b: 9, c: 1};

function store(v) {
  g3.a = v;
  return g3.a;
};
%PrepareFunctionForOptimization(store);
assertEquals(5, store(5));
assertEquals(8, store(8));
%OptimizeFunctionOnNextCall(store);
assertEquals(10, store(10));
delete g3.c;
store(7);
assertEquals({a: 7, b: 9}, g3);