immune_region.cc revision 38e68e9978236db87c9008bbe47db80525d2fa16 
1/*
2 * Copyright (C) 2014 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#include "immune_region.h"
18
19#include "gc/space/space-inl.h"
20#include "mirror/object.h"
21
22namespace art {
23namespace gc {
24namespace collector {
25
26ImmuneRegion::ImmuneRegion() {
27  Reset();
28}
29
30void ImmuneRegion::Reset() {
31  begin_ = nullptr;
32  end_ = nullptr;
33}
34
35bool ImmuneRegion::AddContinuousSpace(space::ContinuousSpace* space) {
36  // Bind live to mark bitmap if necessary.
37  if (space->GetLiveBitmap() != space->GetMarkBitmap()) {
38    CHECK(space->IsContinuousMemMapAllocSpace());
39    space->AsContinuousMemMapAllocSpace()->BindLiveToMarkBitmap();
40  }
41  mirror::Object* space_begin = reinterpret_cast<mirror::Object*>(space->Begin());
42  mirror::Object* space_limit = reinterpret_cast<mirror::Object*>(space->Limit());
43  if (IsEmpty()) {
44    begin_ = space_begin;
45    end_ = space_limit;
46  } else {
47    if (space_limit <= begin_) {  // Space is before the immune region.
48      begin_ = space_begin;
49    } else if (space_begin >= end_) {  // Space is after the immune region.
50      end_ = space_limit;
51    } else {
52      return false;
53    }
54  }
55  return true;
56}
57
58bool ImmuneRegion::ContainsSpace(const space::ContinuousSpace* space) const {
59  bool contains =
60      begin_ <= reinterpret_cast<mirror::Object*>(space->Begin()) &&
61      end_ >= reinterpret_cast<mirror::Object*>(space->Limit());
62  if (kIsDebugBuild && contains) {
63    // A bump pointer space shoult not be in the immune region.
64    DCHECK(space->GetType() != space::kSpaceTypeBumpPointerSpace);
65  }
66  return contains;
67}
68
69}  // namespace collector
70}  // namespace gc
71}  // namespace art
72