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:
MallocAllocator()29   explicit MallocAllocator() {}
~MallocAllocator()30   ~MallocAllocator() {}
31 
Alloc(size_t size)32   void* Alloc(size_t size) {
33     return calloc(sizeof(uint8_t), size);
34   }
35 
Free(void * p)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:
NoopAllocator()48   explicit NoopAllocator() {}
~NoopAllocator()49   ~NoopAllocator() {}
50 
Alloc(size_t size ATTRIBUTE_UNUSED)51   void* Alloc(size_t size ATTRIBUTE_UNUSED) {
52     LOG(FATAL) << "NoopAllocator::Alloc should not be called";
53     UNREACHABLE();
54   }
55 
Free(void * p ATTRIBUTE_UNUSED)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 
GetMallocAllocator()66 Allocator* Allocator::GetMallocAllocator() {
67   return &g_malloc_allocator;
68 }
69 
GetNoopAllocator()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 
Dump(std::ostream & os)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