1/*
2 * Copyright (C) 2015 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 ART_RUNTIME_LINEAR_ALLOC_H_
18#define ART_RUNTIME_LINEAR_ALLOC_H_
19
20#include "base/arena_allocator.h"
21
22namespace art {
23
24class ArenaPool;
25
26// TODO: Support freeing if we add poor man's class unloading.
27class LinearAlloc {
28 public:
29  explicit LinearAlloc(ArenaPool* pool);
30
31  void* Alloc(Thread* self, size_t size) REQUIRES(!lock_);
32
33  // Realloc never frees the input pointer, it is the caller's job to do this if necessary.
34  void* Realloc(Thread* self, void* ptr, size_t old_size, size_t new_size) REQUIRES(!lock_);
35
36  // Allocate an array of structs of type T.
37  template<class T>
38  T* AllocArray(Thread* self, size_t elements) REQUIRES(!lock_) {
39    return reinterpret_cast<T*>(Alloc(self, elements * sizeof(T)));
40  }
41
42  // Return the number of bytes used in the allocator.
43  size_t GetUsedMemory() const REQUIRES(!lock_);
44
45  ArenaPool* GetArenaPool() REQUIRES(!lock_);
46
47  // Return true if the linear alloc contrains an address.
48  bool Contains(void* ptr) const REQUIRES(!lock_);
49
50  // Unsafe version of 'Contains' only to be used when the allocator is going
51  // to be deleted.
52  bool ContainsUnsafe(void* ptr) const NO_THREAD_SAFETY_ANALYSIS;
53
54 private:
55  mutable Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
56  ArenaAllocator allocator_ GUARDED_BY(lock_);
57
58  DISALLOW_IMPLICIT_CONSTRUCTORS(LinearAlloc);
59};
60
61}  // namespace art
62
63#endif  // ART_RUNTIME_LINEAR_ALLOC_H_
64