dalvik/vm/alloc/WriteBarrier.h

   1 /*
   2  * Copyright (C) 2010 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef DALVIK_ALLOC_WRITEBARRIER_H_
  18 #define DALVIK_ALLOC_WRITEBARRIER_H_
  19
  20 /*
  21  * Note writes to the heap. These functions must be called if a field
  22  * of an Object in the heap changes, and before any GC safe-point. The
  23  * call is not needed if NULL is stored in the field.
  24  */
  25
  26 /*
  27  * The address within the Object has been written, and perhaps changed.
  28  */
  29 INLINE void dvmWriteBarrierField(const Object *obj, void *addr)
  30 {
  31     dvmMarkCard(obj);
  32 }
  33
  34 /*
  35  * All of the Object may have changed.
  36  */
  37 INLINE void dvmWriteBarrierObject(const Object *obj)
  38 {
  39     dvmMarkCard(obj);
  40 }
  41
  42 /*
  43  * Some or perhaps all of the array indexes in the Array, greater than
  44  * or equal to start and strictly less than end, have been written,
  45  * and perhaps changed.
  46  */
  47 INLINE void dvmWriteBarrierArray(const ArrayObject *obj,
  48                                  size_t start, size_t end)
  49 {
  50     dvmMarkCard((Object *)obj);
  51 }
  52
  53 #endif  // DALVIK_ALLOC_WRITEBARRIER_H_