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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// Flags: --allow-natives-syntax

var g1 = { a:1 }

function load() {
  return g1.a;
}

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;
}

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;
}

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);