v8/test/mjsunit/regress/regress-crbug-245480.js

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//
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// Flags: --allow-natives-syntax --smi-only-arrays --expose-gc
// Flags: --noalways-opt

// Test element kind of objects.
// Since --smi-only-arrays affects builtins, its default setting at compile
// time sticks if built with snapshot.  If --smi-only-arrays is deactivated
// by default, only a no-snapshot build actually has smi-only arrays enabled
// in this test case.  Depending on whether smi-only arrays are actually
// enabled, this test takes the appropriate code path to check smi-only arrays.

// support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8));
support_smi_only_arrays = true;

if (support_smi_only_arrays) {
  print("Tests include smi-only arrays.");
} else {
  print("Tests do NOT include smi-only arrays.");
}

function isHoley(obj) {
  if (%HasFastHoleyElements(obj)) return true;
  return false;
}

function assertHoley(obj, name_opt) {
  assertEquals(true, isHoley(obj), name_opt);
}

function assertNotHoley(obj, name_opt) {
  assertEquals(false, isHoley(obj), name_opt);
}

if (support_smi_only_arrays) {
  function create_array(arg) {
    return new Array(arg);
  }

  obj = create_array(0);
  assertNotHoley(obj);
  create_array(0);
  %OptimizeFunctionOnNextCall(create_array);
  obj = create_array(10);
  assertHoley(obj);
}

// The code below would assert in debug or crash in release
function f(length) {
  return new Array(length)
}

f(0);
f(0);
%OptimizeFunctionOnNextCall(f);
var a = f(10);

function g(a) {
  return a[0];
}

var b = [0];
g(b);
g(b);
assertEquals(undefined, g(a));