v8/test/mjsunit/regress/regress-crbug-315252.js

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// modification, are permitted provided that the following conditions are
// met:
//
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// Flags: --allow-natives-syntax

function f(a, b, c) {
  this.a = a;
  this.b = b;
  this.c = c;
}
var o3 = new f(1, 2, 3.5);
var o4 = new f(1, 2.5, 3);
var o1 = new f(1.5, 2, 3);
var o2 = new f(1.5, 2, 3);
function migrate(o) {
  return o.a;
}
// Use migrate to stabilize o1, o2 and o4 in [double, double, smi].
migrate(o4);
migrate(o1);
migrate(o2);
function store_transition(o) {
  o.d = 1;
}
// Optimize "store_transition" to transition from [double, double, smi] to
// [double, double, smi, smi]. This adds a dependency on the
// [double, double, smi] map.
;
%PrepareFunctionForOptimization(store_transition);
store_transition(o4);
store_transition(o1);
store_transition(o2);
%OptimizeFunctionOnNextCall(store_transition);
// Pass in a deprecated object of format [smi, smi, double]. This will migrate
// the instance, forcing a merge with [double, double, smi], ending up with
// [double, double, double], which deprecates [double, double, smi] and
// deoptimizes all dependencies of [double, double, smi], including
// store_transition itself.
store_transition(o3);