1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_COMPILER_DEX_ARENA_ALLOCATOR_H_
#define ART_COMPILER_DEX_ARENA_ALLOCATOR_H_
#include <stdint.h>
#include <stddef.h>
#include "base/mutex.h"
#include "compiler_enums.h"
#include "mem_map.h"
namespace art {
class Arena;
class ArenaPool;
class ArenaAllocator;
class Arena {
public:
static constexpr size_t kDefaultSize = 128 * KB;
explicit Arena(size_t size = kDefaultSize);
~Arena();
void Reset();
uint8_t* Begin() {
return memory_;
}
uint8_t* End() {
return memory_ + size_;
}
size_t Size() const {
return size_;
}
size_t RemainingSpace() const {
return Size() - bytes_allocated_;
}
private:
size_t bytes_allocated_;
uint8_t* memory_;
size_t size_;
MemMap* map_;
Arena* next_;
friend class ArenaPool;
friend class ArenaAllocator;
DISALLOW_COPY_AND_ASSIGN(Arena);
};
class ArenaPool {
public:
ArenaPool();
~ArenaPool();
Arena* AllocArena(size_t size);
void FreeArena(Arena* arena);
private:
Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
Arena* free_arenas_ GUARDED_BY(lock_);
DISALLOW_COPY_AND_ASSIGN(ArenaPool);
};
class ArenaAllocator {
public:
// Type of allocation for memory tuning.
enum ArenaAllocKind {
kAllocMisc,
kAllocBB,
kAllocLIR,
kAllocMIR,
kAllocDFInfo,
kAllocGrowableArray,
kAllocGrowableBitMap,
kAllocDalvikToSSAMap,
kAllocDebugInfo,
kAllocSuccessor,
kAllocRegAlloc,
kAllocData,
kAllocPredecessors,
kNumAllocKinds
};
static constexpr bool kCountAllocations = false;
explicit ArenaAllocator(ArenaPool* pool);
~ArenaAllocator();
// Returns zeroed memory.
void* Alloc(size_t bytes, ArenaAllocKind kind) ALWAYS_INLINE {
if (UNLIKELY(running_on_valgrind_)) {
return AllocValgrind(bytes, kind);
}
bytes = (bytes + 3) & ~3;
if (UNLIKELY(ptr_ + bytes > end_)) {
// Obtain a new block.
ObtainNewArenaForAllocation(bytes);
if (UNLIKELY(ptr_ == nullptr)) {
return nullptr;
}
}
if (kCountAllocations) {
alloc_stats_[kind] += bytes;
++num_allocations_;
}
uint8_t* ret = ptr_;
ptr_ += bytes;
return ret;
}
void* AllocValgrind(size_t bytes, ArenaAllocKind kind);
void ObtainNewArenaForAllocation(size_t allocation_size);
size_t BytesAllocated() const;
void DumpMemStats(std::ostream& os) const;
private:
void UpdateBytesAllocated();
ArenaPool* pool_;
uint8_t* begin_;
uint8_t* end_;
uint8_t* ptr_;
Arena* arena_head_;
size_t num_allocations_;
size_t alloc_stats_[kNumAllocKinds]; // Bytes used by various allocation kinds.
bool running_on_valgrind_;
DISALLOW_COPY_AND_ASSIGN(ArenaAllocator);
}; // ArenaAllocator
struct MemStats {
public:
void Dump(std::ostream& os) const {
arena_.DumpMemStats(os);
}
explicit MemStats(const ArenaAllocator &arena) : arena_(arena) {}
private:
const ArenaAllocator &arena_;
}; // MemStats
} // namespace art
#endif // ART_COMPILER_DEX_ARENA_ALLOCATOR_H_
|
