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      1 /*
      2  * Copyright (C) 2013 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 "allocator.h"
     18 
     19 #include <inttypes.h>
     20 #include <stdlib.h>
     21 
     22 #include "atomic.h"
     23 #include "base/logging.h"
     24 #include "thread-inl.h"
     25 
     26 namespace art {
     27 
     28 class MallocAllocator FINAL : public Allocator {
     29  public:
     30   explicit MallocAllocator() {}
     31   ~MallocAllocator() {}
     32 
     33   void* Alloc(size_t size) {
     34     return calloc(sizeof(uint8_t), size);
     35   }
     36 
     37   void Free(void* p) {
     38     free(p);
     39   }
     40 
     41  private:
     42   DISALLOW_COPY_AND_ASSIGN(MallocAllocator);
     43 };
     44 
     45 MallocAllocator g_malloc_allocator;
     46 
     47 class NoopAllocator FINAL : public Allocator {
     48  public:
     49   explicit NoopAllocator() {}
     50   ~NoopAllocator() {}
     51 
     52   void* Alloc(size_t size) {
     53     UNUSED(size);
     54     LOG(FATAL) << "NoopAllocator::Alloc should not be called";
     55     UNREACHABLE();
     56   }
     57 
     58   void Free(void* p) {
     59     // Noop.
     60     UNUSED(p);
     61   }
     62 
     63  private:
     64   DISALLOW_COPY_AND_ASSIGN(NoopAllocator);
     65 };
     66 
     67 NoopAllocator g_noop_allocator;
     68 
     69 Allocator* Allocator::GetMallocAllocator() {
     70   return &g_malloc_allocator;
     71 }
     72 
     73 Allocator* Allocator::GetNoopAllocator() {
     74   return &g_noop_allocator;
     75 }
     76 
     77 namespace TrackedAllocators {
     78 
     79 // These globals are safe since they don't have any non-trivial destructors.
     80 Atomic<size_t> g_bytes_used[kAllocatorTagCount];
     81 volatile size_t g_max_bytes_used[kAllocatorTagCount];
     82 Atomic<uint64_t> g_total_bytes_used[kAllocatorTagCount];
     83 
     84 void Dump(std::ostream& os) {
     85   if (kEnableTrackingAllocator) {
     86     os << "Dumping native memory usage\n";
     87     for (size_t i = 0; i < kAllocatorTagCount; ++i) {
     88       uint64_t bytes_used = g_bytes_used[i].LoadRelaxed();
     89       uint64_t max_bytes_used = g_max_bytes_used[i];
     90       uint64_t total_bytes_used = g_total_bytes_used[i].LoadRelaxed();
     91       if (total_bytes_used != 0) {
     92         os << static_cast<AllocatorTag>(i) << " active=" << bytes_used << " max="
     93            << max_bytes_used << " total=" << total_bytes_used << "\n";
     94       }
     95     }
     96   }
     97 }
     98 
     99 }  // namespace TrackedAllocators
    100 
    101 }  // namespace art
    102