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:
MallocAllocator()30   explicit MallocAllocator() {}
~MallocAllocator()31   ~MallocAllocator() {}
32 
Alloc(size_t size)33   void* Alloc(size_t size) {
34     return calloc(sizeof(uint8_t), size);
35   }
36 
Free(void * p)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:
NoopAllocator()49   explicit NoopAllocator() {}
~NoopAllocator()50   ~NoopAllocator() {}
51 
Alloc(size_t size)52   void* Alloc(size_t size) {
53     UNUSED(size);
54     LOG(FATAL) << "NoopAllocator::Alloc should not be called";
55     UNREACHABLE();
56   }
57 
Free(void * p)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 
GetMallocAllocator()69 Allocator* Allocator::GetMallocAllocator() {
70   return &g_malloc_allocator;
71 }
72 
GetNoopAllocator()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 
Dump(std::ostream & os)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