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