Move base to DEPS

base/mac/scoped_mach_vm.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef BASE_MAC_SCOPED_MACH_VM_H_
-#define BASE_MAC_SCOPED_MACH_VM_H_
-
-#include <mach/mach.h>
-
-#include <algorithm>
-
-#include "base/base_export.h"
-#include "base/basictypes.h"
-#include "base/logging.h"
-
-// Use ScopedMachVM to supervise ownership of pages in the current process
-// through the Mach VM subsystem. Pages allocated with vm_allocate can be
-// released when exiting a scope with ScopedMachVM.
-//
-// The Mach VM subsystem operates on a page-by-page basis, and a single VM
-// allocation managed by a ScopedMachVM object may span multiple pages. As far
-// as Mach is concerned, allocated pages may be deallocated individually. This
-// is in contrast to higher-level allocators such as malloc, where the base
-// address of an allocation implies the size of an allocated block.
-// Consequently, it is not sufficient to just pass the base address of an
-// allocation to ScopedMachVM, it also needs to know the size of the
-// allocation. To avoid any confusion, both the base address and size must
-// be page-aligned.
-//
-// When dealing with Mach VM, base addresses will naturally be page-aligned,
-// but user-specified sizes may not be. If there's a concern that a size is
-// not page-aligned, use the mach_vm_round_page macro to correct it.
-//
-// Example:
-//
-//   vm_address_t address = 0;
-//   vm_size_t size = 12345;  // This requested size is not page-aligned.
-//   kern_return_t kr =
-//       vm_allocate(mach_task_self(), &address, size, VM_FLAGS_ANYWHERE);
-//   if (kr != KERN_SUCCESS) {
-//     return false;
-//   }
-//   ScopedMachVM vm_owner(address, mach_vm_round_page(size));
-
-namespace base {
-namespace mac {
-
-class BASE_EXPORT ScopedMachVM {
- public:
-  explicit ScopedMachVM(vm_address_t address = 0, vm_size_t size = 0)
-      : address_(address), size_(size) {
-    DCHECK_EQ(address % PAGE_SIZE, 0u);
-    DCHECK_EQ(size % PAGE_SIZE, 0u);
-  }
-
-  ~ScopedMachVM() {
-    if (size_) {
-      vm_deallocate(mach_task_self(), address_, size_);
-    }
-  }
-
-  void reset(vm_address_t address = 0, vm_size_t size = 0);
-
-  vm_address_t address() const {
-    return address_;
-  }
-
-  vm_size_t size() const {
-    return size_;
-  }
-
-  void swap(ScopedMachVM& that) {
-    std::swap(address_, that.address_);
-    std::swap(size_, that.size_);
-  }
-
-  void release() {
-    address_ = 0;
-    size_ = 0;
-  }
-
- private:
-  vm_address_t address_;
-  vm_size_t size_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedMachVM);
-};
-
-}  // namespace mac
-}  // namespace base
-
-#endif  // BASE_MAC_SCOPED_MACH_VM_H_