src/v8/test/mjsunit/regress/regress-247688.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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//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//       contributors may be used to endorse or promote products derived
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//
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// Flags: --allow-natives-syntax

var a = {};
a.x = 1
a.y = 1.5

var b = {}
b.x = 1.5;
b.y = 1;

var c = {}
c.x = 1.5;

var d = {}
d.x = 1.5;

var e = {}
e.x = 1.5;

var f = {}
f.x = 1.5;

var g = {}
g.x = 1.5;

var h = {}
h.x = 1.5;

var i = {}
i.x = 1.5;

var o = {}
var p = {y : 10, z : 1}
o.__proto__ = p;
delete p.z

function foo(v, w) {
  // Make load via IC in optimized code. Its target will get overwritten by
  // lazy deopt patch for the stack check.
  v.y;
  // Make store with transition to make this code dependent on the map.
  w.y = 1;
  return b.y;
}

foo(o, c);
foo(o, d);
foo(o, e);
%OptimizeFunctionOnNextCall(foo);
foo(b, f);
foo(b, g);
foo(b, h);
foo(a, i);