Trying to make preamble for d8.

sdk/lib/_internal/lib/preambles/d8.js

Index: sdk/lib/_internal/lib/preambles/d8.js
diff --git a/sdk/lib/_internal/lib/preambles/d8.js b/sdk/lib/_internal/lib/preambles/d8.js
index 2b20e498350596c49ba89a8227e4eef465dfeb83..e787658e4e1c941d1feffdf249ad7c13a73d2270 100644
--- a/sdk/lib/_internal/lib/preambles/d8.js
+++ b/sdk/lib/_internal/lib/preambles/d8.js
@@ -3,3 +3,256 @@
 // BSD-style license that can be found in the LICENSE file.
 
 // Javascript preamble, that lets the output of dart2js run on V8's d8 shell.
+
+var setTimeout;
+var clearTimeout;
+var setInterval;
+var clearInterval;
+var dartMainRunner;
+var scheduleImmediate;
+
+(function() {
+  // Event loop.
+
+  // Task queue as cyclic list queue.
+  var taskQueue = new Array(8);  // Length is power of 2.
+  var head = 0;
+  var tail = 0;
+  var mask = taskQueue.length - 1;
+  function addTask(elem) {
+    taskQueue[head] = elem;
+    head = (head + 1) & mask;
+    if (head == tail) _growTaskQueue();
+  }
+  function removeTask() {
+    if (head == tail) return;
+    var result = taskQueue[tail];
+    taskQueue[tail] = undefined;
+    tail = (tail + 1) & mask;
+    return result;
+  }
+  function _growTaskQueue() {
+    // head == tail.
+    var length = taskQueue.length;
+    var split = head;
+    taskQueue.length = length * 2;
+    if (split * 2 < length) {  // split < length / 2
+      for (var i = 0; i < split; i++) {
+        taskQueue[length + i] = taskQueue[i];
+        taskQueue[i] = undefined;
+      }
+      head += length;
+    } else {
+      for (var i = split; i < length; i++) {
+        taskQueue[length + i] = taskQueue[i];
+        taskQueue[i] = undefined;
+      }
+      tail += length;
+    }
+    mask = taskQueue.length - 1;
+  }
+
+  // Mapping from timer id to timer function.
+  // The timer id is written on the function as .$timerId.
+  // That field is cleared when the timer is cancelled, but it is not returned
+  // from the queue until its time comes.
+  var timerIds = {};
+  var timerIdCounter = 1;  // Counter used to assing ids.
+
+  // Zero-timer queue as simple array queue using push/shift.
+  var zeroTimerQueue = [];
+
+  function addTimer(f, ms) {
+    var id = timerIdCounter++;
+    f.$timerId = id;
+    timerIds[id] = f;
+    if (ms == 0) {
+      zeroTimerQueue.push(f);
+    } else {
+      addDelayedTimer(f, ms);
+    }
+    return id;
+  }
+
+  function nextZeroTimer() {
+    while (zeroTimerQueue.length > 0) {
+      var action = zeroTimerQueue.shift();
+      if (action.$timerId !== undefined) return action;
+    }
+  }
+
+  function nextEvent() {
+    var action = removeTask();
+    if (action) {
+      return action;
+    }
+    do {
+      action = nextZeroTimer();
+      if (action) break;
+      var nextList = nextDelayedTimerQueue();
+      if (!nextList) {
+        return;
+      }
+      var newTime = nextList.shift();
+      advanceTimeTo(newTime);
+      zeroTimerQueue = nextList;
+    } while (true)
+    var id = action.$timerId;
+    clearTimerId(action, id);
+    return action;
+  }
+
+  // Mocking time.
+  var timeOffset = 0;
+  var now = function() {
+    // Install the mock Date object only once.
+    // Following calls to "now" will just use the new (mocked) Date.now
+    // method directly.
+    installMockDate();
+    now = Date.now;
+    return Date.now();
+  };
+  var originalDate = Date;
+  var originalNow = originalDate.now;
+  function advanceTimeTo(time) {
+    timeOffset = time - originalNow();
+  }
+  function installMockDate() {
+    var NewDate = function Date(Y, M, D, h, m, s, ms) {
+      if (this instanceof Date) {
+        // Assume a construct call.
+        switch (arguments.length) {
+          case 0:  return new originalDate(originalNow() + timeOffset);
+          case 1:  return new originalDate(Y);
+          case 2:  return new originalDate(Y, M);
+          case 3:  return new originalDate(Y, M, D);
+          case 4:  return new originalDate(Y, M, D, h);
+          case 5:  return new originalDate(Y, M, D, h, m);
+          case 6:  return new originalDate(Y, M, D, h, m, s);
+          default: return new originalDate(Y, M, D, h, m, s, ms);
+        }
+      }
+      return new originalDate(originalNow() + timeOffset).toString();
+    };
+    NewDate.now = function now() { return originalNow() + timeOffset; };
+    NewDate.prototype = originalDate.prototype;
+    originalDate.prototype.constructor = NewDate;
+    Date = NewDate;
+  }
+
+  // Heap priority queue with key index.
+  // Each entry is list of [timeout, callback1 ... callbackn].
+  var timerHeap = [];
+  var timerIndex = {};
+  function addDelayedTimer(f, ms) {
+    var timeout = now() + ms;
+    var timerList = timerIndex[timeout];
+    if (timerList == null) {
+      timerList = [timeout, f];
+      timerIndex[timeout] = timerList;
+      var index = timerHeap.length;
+      timerHeap.length += 1;
+      bubbleUp(index, timeout, timerList);
+    } else {
+      timerList.push(f);
+    }
+  }
+
+  function nextDelayedTimerQueue() {
+    if (timerHeap.length == 0) return null;
+    var result = timerHeap[0];
+    var last = timerHeap.pop();
+    if (timerHeap.length > 0) {
+      bubbleDown(0, last[0], last);
+    }
+    return result;
+  }
+
+  function bubbleUp(index, key, value) {
+    while (index != 0) {
+      var parentIndex = (index - 1) >> 1;
+      var parent = timerHeap[parentIndex];
+      var parentKey = parent[0];
+      if (key > parentKey) break;
+      timerHeap[index] = parent;
+      index = parentIndex;
+    }
+    timerHeap[index] = value;
+  }
+
+  function bubbleDown(index, key, value) {
+    while (true) {
+      var leftChildIndex = index * 2 + 1;
+      if (leftChildIndex >= timerHeap.length) break;
+      var minChildIndex = leftChildIndex;
+      var minChild = timerHeap[leftChildIndex];
+      var minChildKey = minChild[0];
+      var rightChildIndex = leftChildIndex + 1;
+      if (rightChildIndex < timerHeap.length) {
+        var rightChild = timerHeap[rightChildIndex];
+        var rightKey = rightChild[0];
+        if (rightKey < minChildKey) {
+          minChildIndex = rightChildIndex;
+          minChild = rightChild;
+          minChildKey = rightKey;
+        }
+      }
+      if (minChildKey > key) break;
+      timerHeap[index] = minChild;
+      index = minChildIndex;
+    }
+    timerHeap[index] = value;
+  }
+
+  function addInterval(f, ms) {
+    var id = timerIdCounter++;
+    function repeat() {
+      // Reactivate with the same id.
+      repeat.$timerId = id;
+      timerIds[id] = repeat;
+      addDelayedTimer(repeat, ms);
+      f();
+    }
+    repeat.$timerId = id;
+    timerIds[id] = repeat;
+    addDelayedTimer(repeat, ms);
+    return id;
+  }
+
+  function cancelTimer(id) {
+    var f = timerIds[id];
+    if (f == null) return;
+    clearTimerId(f, id);
+  }
+
+  function clearTimerId(f, id) {
+    f.$timerId = undefined;
+    delete timerIds[id];
+  }
+
+  function eventLoop(action) {
+    while (action) {
+      try {
+        action();
+      } catch (e) {
+        if (typeof onerror == "function") {
+          onerror(e, null, -1);
+        } else {
+          throw e;
+        }
+      }
+      action = nextEvent();
+    }
+  }
+
+  dartMainRunner = function(main, args) {
+    // Initialize.
+    var action = function() { main(args); }
+    eventLoop(action);
+  };
+  setTimeout = addTimer;
+  clearTimeout = cancelTimer;
+  setInterval = addInterval;
+  clearInterval = cancelTimer;
+  scheduleImmediate = addTask;
+})();