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
|
// Copyright 2017 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/base/page-allocator.h"
#include "src/base/platform/platform.h"
namespace v8 {
namespace base {
#define STATIC_ASSERT_ENUM(a, b) \
static_assert(static_cast<int>(a) == static_cast<int>(b), \
"mismatching enum: " #a)
STATIC_ASSERT_ENUM(PageAllocator::kNoAccess,
base::OS::MemoryPermission::kNoAccess);
STATIC_ASSERT_ENUM(PageAllocator::kReadWrite,
base::OS::MemoryPermission::kReadWrite);
STATIC_ASSERT_ENUM(PageAllocator::kReadWriteExecute,
base::OS::MemoryPermission::kReadWriteExecute);
STATIC_ASSERT_ENUM(PageAllocator::kReadExecute,
base::OS::MemoryPermission::kReadExecute);
#undef STATIC_ASSERT_ENUM
PageAllocator::PageAllocator()
: allocate_page_size_(base::OS::AllocatePageSize()),
commit_page_size_(base::OS::CommitPageSize()) {}
void PageAllocator::SetRandomMmapSeed(int64_t seed) {
base::OS::SetRandomMmapSeed(seed);
}
void* PageAllocator::GetRandomMmapAddr() {
return base::OS::GetRandomMmapAddr();
}
void* PageAllocator::AllocatePages(void* address, size_t size, size_t alignment,
PageAllocator::Permission access) {
return base::OS::Allocate(address, size, alignment,
static_cast<base::OS::MemoryPermission>(access));
}
bool PageAllocator::FreePages(void* address, size_t size) {
return base::OS::Free(address, size);
}
bool PageAllocator::ReleasePages(void* address, size_t size, size_t new_size) {
DCHECK_LT(new_size, size);
return base::OS::Release(reinterpret_cast<uint8_t*>(address) + new_size,
size - new_size);
}
bool PageAllocator::SetPermissions(void* address, size_t size,
PageAllocator::Permission access) {
return base::OS::SetPermissions(
address, size, static_cast<base::OS::MemoryPermission>(access));
}
bool PageAllocator::DiscardSystemPages(void* address, size_t size) {
return base::OS::DiscardSystemPages(address, size);
}
} // namespace base
} // namespace v8
|
