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
|
/*
* Copyright (C) 2017 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_RUNTIME_METHOD_INFO_H_
#define ART_RUNTIME_METHOD_INFO_H_
#include "base/logging.h"
#include "leb128.h"
#include "memory_region.h"
namespace art {
// Method info is for not dedupe friendly data of a method. Currently it only holds methods indices.
// Putting this data in MethodInfo instead of code infos saves ~5% oat size.
class MethodInfo {
using MethodIndexType = uint16_t;
public:
// Reading mode
explicit MethodInfo(const uint8_t* ptr) {
if (ptr != nullptr) {
num_method_indices_ = DecodeUnsignedLeb128(&ptr);
region_ = MemoryRegion(const_cast<uint8_t*>(ptr),
num_method_indices_ * sizeof(MethodIndexType));
}
}
// Writing mode
MethodInfo(uint8_t* ptr, size_t num_method_indices) : num_method_indices_(num_method_indices) {
DCHECK(ptr != nullptr);
ptr = EncodeUnsignedLeb128(ptr, num_method_indices_);
region_ = MemoryRegion(ptr, num_method_indices_ * sizeof(MethodIndexType));
}
static size_t ComputeSize(size_t num_method_indices) {
uint8_t temp[8];
uint8_t* ptr = temp;
ptr = EncodeUnsignedLeb128(ptr, num_method_indices);
return (ptr - temp) + num_method_indices * sizeof(MethodIndexType);
}
ALWAYS_INLINE MethodIndexType GetMethodIndex(size_t index) const {
// Use bit functions to avoid pesky alignment requirements.
return region_.LoadBits(index * BitSizeOf<MethodIndexType>(), BitSizeOf<MethodIndexType>());
}
void SetMethodIndex(size_t index, MethodIndexType method_index) {
region_.StoreBits(index * BitSizeOf<MethodIndexType>(),
method_index,
BitSizeOf<MethodIndexType>());
}
size_t NumMethodIndices() const {
return num_method_indices_;
}
private:
size_t num_method_indices_ = 0u;
MemoryRegion region_;
};
} // namespace art
#endif // ART_RUNTIME_METHOD_INFO_H_
|
