1 // Copyright 2014 The Chromium Authors
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/apple/scoped_mach_vm.h"
6
7 #include "base/apple/mach_logging.h"
8
9 namespace base::apple {
10
reset(vm_address_t address,vm_size_t size)11 void ScopedMachVM::reset(vm_address_t address, vm_size_t size) {
12 DCHECK_EQ(address % PAGE_SIZE, 0u);
13 DCHECK_EQ(size % PAGE_SIZE, 0u);
14 reset_unaligned(address, size);
15 }
16
reset_unaligned(vm_address_t address,vm_size_t size)17 void ScopedMachVM::reset_unaligned(vm_address_t address, vm_size_t size) {
18 if (size_) {
19 if (address_ < address) {
20 kern_return_t kr = vm_deallocate(mach_task_self(), address_,
21 std::min(size_, address - address_));
22 MACH_DCHECK(kr == KERN_SUCCESS, kr) << "vm_deallocate";
23 }
24 if (address_ + size_ > address + size) {
25 vm_address_t deallocate_start = std::max(address_, address + size);
26 kern_return_t kr = vm_deallocate(mach_task_self(), deallocate_start,
27 address_ + size_ - deallocate_start);
28 MACH_DCHECK(kr == KERN_SUCCESS, kr) << "vm_deallocate";
29 }
30 }
31
32 address_ = address;
33 size_ = size;
34 }
35
36 } // namespace base::apple
37