text: // Copyright 2018 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: --harmony-weak-refs --expose-gc --noincremental-marking
  // Flags: --no-stress-flush-bytecode
  
  let cleanup0_call_count = 0;
  let cleanup0_weak_cell_count = 0;
  
  let cleanup1_call_count = 0;
  let cleanup1_weak_cell_count = 0;
  
  let cleanup0 = function(iter) {
    for (wc of iter) {
      ++cleanup0_weak_cell_count;
    }
    ++cleanup0_call_count;
  }
  
  let cleanup1 = function(iter) {
    for (wc of iter) {
      ++cleanup1_weak_cell_count;
    }
    ++cleanup1_call_count;
  }
  
  let wf0 = new WeakFactory(cleanup0);
  let wf1 = new WeakFactory(cleanup1);
  
  // Create 1 WeakCell for each WeakFactory and kill the objects they point to.
  (function() {
    // The objects need to be inside a closure so that we can reliably kill them.
    let objects = [];
    objects[0] = {};
    objects[1] = {};
  
    wf0.makeCell(objects[0]);
    wf1.makeCell(objects[1]);
  
    // Drop the references to the objects.
    objects = [];
  
    // Will schedule both wf0 and wf1 for cleanup.
    gc();
  })();
  
  // Before the cleanup task has a chance to run, do the same thing again, so both
  // factories are (again) scheduled for cleanup. This has to be a IIFE function
  // (so that we can reliably kill the objects) so we cannot use the same function
  // as before.
  (function() {
    let objects = [];
    objects[0] = {};
    objects[1] = {};
    wf0.makeCell(objects[0]);
    wf1.makeCell(objects[1]);
    objects = [];
    gc();
  })();
  
  let timeout_func = function() {
    assertEquals(1, cleanup0_call_count);
    assertEquals(2, cleanup0_weak_cell_count);
    assertEquals(1, cleanup1_call_count);
    assertEquals(2, cleanup1_weak_cell_count);
  }
  
  // Give the cleanup task a chance to run. All WeakCells to cleanup will be
  // available during the same invocation of the cleanup function.
  setTimeout(timeout_func, 0);
  