// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:core' hide Symbol;

@patch
List makeListFixedLength(List growableList)
    native "Internal_makeListFixedLength";

@patch
List makeFixedListUnmodifiable(List fixedLengthList)
    native "Internal_makeFixedListUnmodifiable";

class VMLibraryHooks {
  // Example: "dart:isolate _Timer._factory"
  static var timerFactory;

  // Example: "dart:io _EventHandler._sendData"
  static var eventHandlerSendData;

  // A nullary closure that answers the current clock value in milliseconds.
  // Example: "dart:io _EventHandler._timerMillisecondClock"
  static var timerMillisecondClock;

  // Implementation of Resource.readAsBytes.
  static var resourceReadAsBytes;

  // Implementation of package root/map provision.
  static var packageRootString;
  static var packageConfigString;
  static var packageRootUriFuture;
  static var packageConfigUriFuture;
  static var resolvePackageUriFuture;

  static var platformScript;
}

final bool is64Bit = _inquireIs64Bit();

bool _inquireIs64Bit() native "Internal_inquireIs64Bit";

bool _classRangeCheck(int cid, int lowerLimit, int upperLimit) {
  return cid >= lowerLimit && cid <= upperLimit;
}

bool _classRangeCheckNegative(int cid, int lowerLimit, int upperLimit) {
  return cid < lowerLimit || cid > upperLimit;
}

// Utility class now only used by the VM.
class Lists {
  static void copy(List src, int srcStart, List dst, int dstStart, int count) {
    if (srcStart < dstStart) {
      for (int i = srcStart + count - 1, j = dstStart + count - 1;
          i >= srcStart;
          i--, j--) {
        dst[j] = src[i];
      }
    } else {
      for (int i = srcStart, j = dstStart; i < srcStart + count; i++, j++) {
        dst[j] = src[i];
      }
    }
  }
}