src/v8/test/mjsunit/regress/regress-crbug-134055.js

// Copyright 2012 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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//       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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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Flags: --allow-natives-syntax

function crash(obj) {
  return obj.foo;
}

function base(number_of_properties) {
  var result = new Array();
  for (var i = 0; i < number_of_properties; i++) {
    result["property" + i] = "value" + i;
  }
  result.foo = number_of_properties;
  return result;
}

var a = base(12);
var b = base(13);
var c = base(14);
var d = base(15);

crash(a);  // Premonomorphic.
crash(a);
crash(b);
crash(c);
crash(d);  // Polymorphic, degree 4.

//Prepare ElementsKind transition map chain.
var x = base(13);
x[0] = "object";
x = base(14);
x[0] = "object";
x = base(15);
x[0] = "object";

%OptimizeFunctionOnNextCall(crash);
crash(a);