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