1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/mac/scoped_mach_vm.h"
6
7 namespace base {
8 namespace mac {
9
reset(vm_address_t address,vm_size_t size)10 void ScopedMachVM::reset(vm_address_t address, vm_size_t size) {
11 DCHECK_EQ(address % PAGE_SIZE, 0u);
12 DCHECK_EQ(size % PAGE_SIZE, 0u);
13
14 if (size_) {
15 if (address_ < address) {
16 vm_deallocate(mach_task_self(),
17 address_,
18 std::min(size_, address - address_));
19 }
20 if (address_ + size_ > address + size) {
21 vm_address_t deallocate_start = std::max(address_, address + size);
22 vm_deallocate(mach_task_self(),
23 deallocate_start,
24 address_ + size_ - deallocate_start);
25 }
26 }
27
28 address_ = address;
29 size_ = size;
30 }
31
32 } // namespace mac
33 } // namespace base
34