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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/allocation.h"
#include <stdlib.h> // For free, malloc.
#include "src/base/bits.h"
#include "src/base/logging.h"
#include "src/base/platform/platform.h"
#include "src/utils.h"
#include "src/v8.h"
#if V8_LIBC_BIONIC
#include <malloc.h> // NOLINT
#endif
#if defined(LEAK_SANITIZER)
#include <sanitizer/lsan_interface.h>
#endif
namespace v8 {
namespace internal {
namespace {
void* AlignedAllocInternal(size_t size, size_t alignment) {
void* ptr;
#if V8_OS_WIN
ptr = _aligned_malloc(size, alignment);
#elif V8_LIBC_BIONIC
// posix_memalign is not exposed in some Android versions, so we fall back to
// memalign. See http://code.google.com/p/android/issues/detail?id=35391.
ptr = memalign(alignment, size);
#else
if (posix_memalign(&ptr, alignment, size)) ptr = nullptr;
#endif
return ptr;
}
} // namespace
void* Malloced::New(size_t size) {
void* result = malloc(size);
if (result == nullptr) {
V8::GetCurrentPlatform()->OnCriticalMemoryPressure();
result = malloc(size);
if (result == nullptr) {
V8::FatalProcessOutOfMemory("Malloced operator new");
}
}
return result;
}
void Malloced::Delete(void* p) {
free(p);
}
char* StrDup(const char* str) {
int length = StrLength(str);
char* result = NewArray<char>(length + 1);
MemCopy(result, str, length);
result[length] = '\0';
return result;
}
char* StrNDup(const char* str, int n) {
int length = StrLength(str);
if (n < length) length = n;
char* result = NewArray<char>(length + 1);
MemCopy(result, str, length);
result[length] = '\0';
return result;
}
void* AlignedAlloc(size_t size, size_t alignment) {
DCHECK_LE(V8_ALIGNOF(void*), alignment);
DCHECK(base::bits::IsPowerOfTwo(alignment));
void* ptr = AlignedAllocInternal(size, alignment);
if (ptr == nullptr) {
V8::GetCurrentPlatform()->OnCriticalMemoryPressure();
ptr = AlignedAllocInternal(size, alignment);
if (ptr == nullptr) {
V8::FatalProcessOutOfMemory("AlignedAlloc");
}
}
return ptr;
}
void AlignedFree(void *ptr) {
#if V8_OS_WIN
_aligned_free(ptr);
#elif V8_LIBC_BIONIC
// Using free is not correct in general, but for V8_LIBC_BIONIC it is.
free(ptr);
#else
free(ptr);
#endif
}
byte* AllocateSystemPage(void* address, size_t* allocated) {
size_t page_size = base::OS::AllocatePageSize();
void* result = base::OS::Allocate(address, page_size, page_size,
base::OS::MemoryPermission::kReadWrite);
if (result != nullptr) *allocated = page_size;
return static_cast<byte*>(result);
}
VirtualMemory::VirtualMemory() : address_(nullptr), size_(0) {}
VirtualMemory::VirtualMemory(size_t size, void* hint, size_t alignment)
: address_(nullptr), size_(0) {
size_t page_size = base::OS::AllocatePageSize();
size_t alloc_size = RoundUp(size, page_size);
address_ = base::OS::Allocate(hint, alloc_size, alignment,
base::OS::MemoryPermission::kNoAccess);
if (address_ != nullptr) {
size_ = alloc_size;
#if defined(LEAK_SANITIZER)
__lsan_register_root_region(address_, size_);
#endif
}
}
VirtualMemory::~VirtualMemory() {
if (IsReserved()) {
Free();
}
}
void VirtualMemory::Reset() {
address_ = nullptr;
size_ = 0;
}
bool VirtualMemory::SetPermissions(void* address, size_t size,
base::OS::MemoryPermission access) {
CHECK(InVM(address, size));
bool result = base::OS::SetPermissions(address, size, access);
DCHECK(result);
USE(result);
return result;
}
size_t VirtualMemory::Release(void* free_start) {
DCHECK(IsReserved());
DCHECK(IsAddressAligned(static_cast<Address>(free_start),
base::OS::CommitPageSize()));
// Notice: Order is important here. The VirtualMemory object might live
// inside the allocated region.
const size_t free_size = size_ - (reinterpret_cast<size_t>(free_start) -
reinterpret_cast<size_t>(address_));
CHECK(InVM(free_start, free_size));
DCHECK_LT(address_, free_start);
DCHECK_LT(free_start, reinterpret_cast<void*>(
reinterpret_cast<size_t>(address_) + size_));
#if defined(LEAK_SANITIZER)
__lsan_unregister_root_region(address_, size_);
__lsan_register_root_region(address_, size_ - free_size);
#endif
CHECK(base::OS::Release(free_start, free_size));
size_ -= free_size;
return free_size;
}
void VirtualMemory::Free() {
DCHECK(IsReserved());
// Notice: Order is important here. The VirtualMemory object might live
// inside the allocated region.
void* address = address_;
size_t size = size_;
CHECK(InVM(address, size));
Reset();
#if defined(LEAK_SANITIZER)
__lsan_unregister_root_region(address, size);
#endif
CHECK(base::OS::Free(address, size));
}
void VirtualMemory::TakeControl(VirtualMemory* from) {
DCHECK(!IsReserved());
address_ = from->address_;
size_ = from->size_;
from->Reset();
}
bool AllocVirtualMemory(size_t size, void* hint, VirtualMemory* result) {
VirtualMemory first_try(size, hint);
if (first_try.IsReserved()) {
result->TakeControl(&first_try);
return true;
}
V8::GetCurrentPlatform()->OnCriticalMemoryPressure();
VirtualMemory second_try(size, hint);
result->TakeControl(&second_try);
return result->IsReserved();
}
bool AlignedAllocVirtualMemory(size_t size, size_t alignment, void* hint,
VirtualMemory* result) {
VirtualMemory first_try(size, hint, alignment);
if (first_try.IsReserved()) {
result->TakeControl(&first_try);
return true;
}
V8::GetCurrentPlatform()->OnCriticalMemoryPressure();
VirtualMemory second_try(size, hint, alignment);
result->TakeControl(&second_try);
return result->IsReserved();
}
} // namespace internal
} // namespace v8
|
