v8/test/mjsunit/regress/regress-4121.js

// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --allow-natives-syntax

function literals_sharing_test(warmup, optimize) {
  function closure() {
    // Ensure small array literals start in specific element kind mode.
    assertTrue(%HasFastSmiElements([]));
    assertTrue(%HasFastSmiElements([1]));
    assertTrue(%HasFastSmiElements([1,2]));
    assertTrue(%HasFastDoubleElements([1.1]));
    assertTrue(%HasFastDoubleElements([1.1,2]));

    var a = [1, 2, 3];
    if (warmup) {
      // Transition elements kind during warmup...
      assertTrue(%HasFastSmiElements(a));
      assertEquals(4, a.push(1.3));
    }
    // ... and ensure that the information about transitioning is
    // propagated to the next closure.
    assertTrue(%HasFastDoubleElements(a));
  };
  if (optimize) %OptimizeFunctionOnNextCall(closure);
  closure();
}


function test() {
  var warmup = true;
  for (var i = 0; i < 3; i++) {
    print("iter: " + i + ", warmup: "+ warmup);
    literals_sharing_test(warmup, false);
    warmup = false;
  }
  print("iter: " + i + ", opt: true");
  literals_sharing_test(warmup, true);
}


function stress_opt_test() {}
stress_opt_test();
if (%GetOptimizationStatus(stress_opt_test) == 2) {
  // This test is not suitable for --always-opt mode.
  test();
}