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Diffstat (limited to 'base/mac/scoped_mach_vm.h')
-rw-r--r-- | base/mac/scoped_mach_vm.h | 92 |
1 files changed, 0 insertions, 92 deletions
diff --git a/base/mac/scoped_mach_vm.h b/base/mac/scoped_mach_vm.h deleted file mode 100644 index ffc00d5a5d..0000000000 --- a/base/mac/scoped_mach_vm.h +++ /dev/null @@ -1,92 +0,0 @@ -// 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_ |