test/mjsunit/strong-rooted-literals.js

// Copyright 2016 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 --expose-gc

// Make sure literals are strongly rooted and safe from weak-code deopts.
(function() {
  function foo() {
    var a = { y: 0 };
    a.y = 1;
    return a;
  }

  foo();
  foo();
  %OptimizeFunctionOnNextCall(foo);
  foo();
  gc();
  assertOptimized(foo);
})();


(function() {
  function hot(o) {
    return o.x + o.y;
  }
  function mapPlus(a, y) {
    return a.map(x => hot({x, y}));
  }

  var a = [1, 2, 3];
  print(mapPlus(a, 1));
  print(mapPlus(a, 2));
  %OptimizeFunctionOnNextCall(hot);
  print(mapPlus(a, 3));
  gc();  // BOOOM!
  assertOptimized(hot);
  print(mapPlus(a, 4));
})();