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
|
/*
* Copyright (C) 2015 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_LINEAR_ALLOC_INL_H_
#define ART_RUNTIME_LINEAR_ALLOC_INL_H_
#include "linear_alloc.h"
#include "base/gc_visited_arena_pool.h"
#include "thread-current-inl.h"
namespace art HIDDEN {
inline void LinearAlloc::SetFirstObject(void* begin, size_t bytes) const {
DCHECK(track_allocations_);
if (ArenaAllocator::IsRunningOnMemoryTool()) {
bytes += ArenaAllocator::kMemoryToolRedZoneBytes;
}
uint8_t* end = static_cast<uint8_t*>(begin) + bytes;
Arena* arena = allocator_.GetHeadArena();
DCHECK_NE(arena, nullptr);
// The object would either be in the head arena or the next one.
if (UNLIKELY(begin < arena->Begin() || begin >= arena->End())) {
arena = arena->Next();
}
DCHECK(begin >= arena->Begin() && end <= arena->End());
down_cast<TrackedArena*>(arena)->SetFirstObject(static_cast<uint8_t*>(begin), end);
}
inline void LinearAlloc::ConvertToNoGcRoots(void* ptr, LinearAllocKind orig_kind) {
if (track_allocations_ && ptr != nullptr) {
TrackingHeader* header = static_cast<TrackingHeader*>(ptr);
header--;
DCHECK_EQ(header->GetKind(), orig_kind);
DCHECK_GT(header->GetSize(), 0u);
// 16-byte allocations are not supported yet.
DCHECK(!header->Is16Aligned());
header->SetKind(LinearAllocKind::kNoGCRoots);
}
}
inline void LinearAlloc::SetupForPostZygoteFork(Thread* self) {
MutexLock mu(self, lock_);
DCHECK(track_allocations_);
allocator_.ResetCurrentArena();
}
inline void* LinearAlloc::Realloc(Thread* self,
void* ptr,
size_t old_size,
size_t new_size,
LinearAllocKind kind) {
MutexLock mu(self, lock_);
if (track_allocations_) {
if (ptr != nullptr) {
// Realloc cannot be called on 16-byte aligned as Realloc doesn't guarantee
// that. So the header must be immediately prior to ptr.
TrackingHeader* header = reinterpret_cast<TrackingHeader*>(ptr) - 1;
DCHECK_EQ(header->GetKind(), kind);
old_size += sizeof(TrackingHeader);
DCHECK_EQ(header->GetSize(), old_size);
ptr = header;
} else {
DCHECK_EQ(old_size, 0u);
}
new_size += sizeof(TrackingHeader);
void* ret = allocator_.Realloc(ptr, old_size, new_size);
new (ret) TrackingHeader(new_size, kind);
SetFirstObject(ret, new_size);
return static_cast<TrackingHeader*>(ret) + 1;
} else {
return allocator_.Realloc(ptr, old_size, new_size);
}
}
inline void* LinearAlloc::Alloc(Thread* self, size_t size, LinearAllocKind kind) {
MutexLock mu(self, lock_);
if (track_allocations_) {
size += sizeof(TrackingHeader);
TrackingHeader* storage = new (allocator_.Alloc(size)) TrackingHeader(size, kind);
SetFirstObject(storage, size);
return storage + 1;
} else {
return allocator_.Alloc(size);
}
}
inline void* LinearAlloc::AllocAlign16(Thread* self, size_t size, LinearAllocKind kind) {
MutexLock mu(self, lock_);
DCHECK_ALIGNED(size, 16);
if (track_allocations_) {
size_t mem_tool_bytes = ArenaAllocator::IsRunningOnMemoryTool()
? ArenaAllocator::kMemoryToolRedZoneBytes : 0;
uint8_t* ptr = allocator_.CurrentPtr() + sizeof(TrackingHeader);
uintptr_t padding =
RoundUp(reinterpret_cast<uintptr_t>(ptr), 16) - reinterpret_cast<uintptr_t>(ptr);
DCHECK_LT(padding, 16u);
size_t required_size = size + sizeof(TrackingHeader) + padding;
if (allocator_.CurrentArenaUnusedBytes() < required_size + mem_tool_bytes) {
// The allocator will require a new arena, which is expected to be
// 16-byte aligned.
static_assert(ArenaAllocator::kArenaAlignment >= 16,
"Expecting sufficient alignment for new Arena.");
required_size = size + RoundUp(sizeof(TrackingHeader), 16);
}
// Using ArenaAllocator's AllocAlign16 now would disturb the alignment by
// trying to make header 16-byte aligned. The alignment requirements are
// already addressed here. Now we want allocator to just bump the pointer.
ptr = static_cast<uint8_t*>(allocator_.Alloc(required_size));
new (ptr) TrackingHeader(required_size, kind, /*is_16_aligned=*/true);
SetFirstObject(ptr, required_size);
return AlignUp(ptr + sizeof(TrackingHeader), 16);
} else {
return allocator_.AllocAlign16(size);
}
}
inline size_t LinearAlloc::GetUsedMemory() const {
MutexLock mu(Thread::Current(), lock_);
return allocator_.BytesUsed();
}
inline ArenaPool* LinearAlloc::GetArenaPool() {
MutexLock mu(Thread::Current(), lock_);
return allocator_.GetArenaPool();
}
inline bool LinearAlloc::Contains(void* ptr) const {
MutexLock mu(Thread::Current(), lock_);
return allocator_.Contains(ptr);
}
} // namespace art
#endif // ART_RUNTIME_LINEAR_ALLOC_INL_H_
|