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      1 /*
      2  * Copyright (C) 2011 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 "arena_bit_vector.h"
     18 
     19 #include "base/allocator.h"
     20 #include "base/arena_allocator.h"
     21 
     22 namespace art {
     23 
     24 template <bool kCount>
     25 class ArenaBitVectorAllocatorKindImpl;
     26 
     27 template <>
     28 class ArenaBitVectorAllocatorKindImpl<false> {
     29  public:
     30   // Not tracking allocations, ignore the supplied kind and arbitrarily provide kArenaAllocSTL.
     31   explicit ArenaBitVectorAllocatorKindImpl(ArenaAllocKind kind ATTRIBUTE_UNUSED) {}
     32   ArenaBitVectorAllocatorKindImpl(const ArenaBitVectorAllocatorKindImpl&) = default;
     33   ArenaBitVectorAllocatorKindImpl& operator=(const ArenaBitVectorAllocatorKindImpl&) = default;
     34   ArenaAllocKind Kind() { return kArenaAllocGrowableBitMap; }
     35 };
     36 
     37 template <bool kCount>
     38 class ArenaBitVectorAllocatorKindImpl {
     39  public:
     40   explicit ArenaBitVectorAllocatorKindImpl(ArenaAllocKind kind) : kind_(kind) { }
     41   ArenaBitVectorAllocatorKindImpl(const ArenaBitVectorAllocatorKindImpl&) = default;
     42   ArenaBitVectorAllocatorKindImpl& operator=(const ArenaBitVectorAllocatorKindImpl&) = default;
     43   ArenaAllocKind Kind() { return kind_; }
     44 
     45  private:
     46   ArenaAllocKind kind_;
     47 };
     48 
     49 using ArenaBitVectorAllocatorKind =
     50     ArenaBitVectorAllocatorKindImpl<kArenaAllocatorCountAllocations>;
     51 
     52 template <typename ArenaAlloc>
     53 class ArenaBitVectorAllocator FINAL : public Allocator, private ArenaBitVectorAllocatorKind {
     54  public:
     55   static ArenaBitVectorAllocator* Create(ArenaAlloc* arena, ArenaAllocKind kind) {
     56     void* storage = arena->template Alloc<ArenaBitVectorAllocator>(kind);
     57     return new (storage) ArenaBitVectorAllocator(arena, kind);
     58   }
     59 
     60   ~ArenaBitVectorAllocator() {
     61     LOG(FATAL) << "UNREACHABLE";
     62     UNREACHABLE();
     63   }
     64 
     65   virtual void* Alloc(size_t size) {
     66     return arena_->Alloc(size, this->Kind());
     67   }
     68 
     69   virtual void Free(void*) {}  // Nop.
     70 
     71  private:
     72   ArenaBitVectorAllocator(ArenaAlloc* arena, ArenaAllocKind kind)
     73       : ArenaBitVectorAllocatorKind(kind), arena_(arena) { }
     74 
     75   ArenaAlloc* const arena_;
     76 
     77   DISALLOW_COPY_AND_ASSIGN(ArenaBitVectorAllocator);
     78 };
     79 
     80 ArenaBitVector::ArenaBitVector(ArenaAllocator* arena,
     81                                unsigned int start_bits,
     82                                bool expandable,
     83                                ArenaAllocKind kind)
     84   :  BitVector(start_bits,
     85                expandable,
     86                ArenaBitVectorAllocator<ArenaAllocator>::Create(arena, kind)) {
     87 }
     88 
     89 ArenaBitVector::ArenaBitVector(ScopedArenaAllocator* arena,
     90                                unsigned int start_bits,
     91                                bool expandable,
     92                                ArenaAllocKind kind)
     93   :  BitVector(start_bits,
     94                expandable,
     95                ArenaBitVectorAllocator<ScopedArenaAllocator>::Create(arena, kind)) {
     96 }
     97 
     98 }  // namespace art
     99