shared_memory_mapping.cc

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// Copyright 2018 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.

#include "base/memory/shared_memory_mapping.h"

#include <utility>

#include "base/logging.h"

#include "base/memory/shared_memory_tracker.h"

#include "base/unguessable_token.h"

#include "build/build_config.h"

#if defined(OS_POSIX)

#include <sys/mman.h>

#endif

#if defined(OS_WIN)

#include <aclapi.h>

#endif

#if defined(OS_MACOSX) && !defined(OS_IOS)

#include <mach/mach_vm.h>

#include "base/mac/mach_logging.h"

#endif

#if defined(OS_FUCHSIA)

#include <lib/zx/vmar.h>

#include "base/fuchsia/fuchsia_logging.h"

#endif

namespace base {

SharedMemoryMapping::SharedMemoryMapping() = default;

SharedMemoryMapping::SharedMemoryMapping(SharedMemoryMapping&& mapping) noexcept

    : memory_(mapping.memory_),

      size_(mapping.size_),

      mapped_size_(mapping.mapped_size_),

      guid_(mapping.guid_) {

  mapping.memory_ = nullptr;

SharedMemoryMapping& SharedMemoryMapping::operator=(

    SharedMemoryMapping&& mapping) noexcept {

  Unmap();

  memory_ = mapping.memory_;

  size_ = mapping.size_;

  mapped_size_ = mapping.mapped_size_;

  guid_ = mapping.guid_;

  mapping.memory_ = nullptr;

  return *this;

SharedMemoryMapping::~SharedMemoryMapping() {

  Unmap();

SharedMemoryMapping::SharedMemoryMapping(void* memory,

                                         size_t size,

                                         size_t mapped_size,

                                         const UnguessableToken& guid)

    : memory_(memory), size_(size), mapped_size_(mapped_size), guid_(guid) {

  SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);

void SharedMemoryMapping::Unmap() {

  if (!IsValid())

    return;

  SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);

#if defined(OS_WIN)

  if (!UnmapViewOfFile(memory_))

    DPLOG(ERROR) << "UnmapViewOfFile";

#elif defined(OS_FUCHSIA)

  uintptr_t addr = reinterpret_cast<uintptr_t>(memory_);

  zx_status_t status = zx::vmar::root_self()->unmap(addr, mapped_size_);

  if (status != ZX_OK)

    ZX_DLOG(ERROR, status) << "zx_vmar_unmap";

#elif defined(OS_MACOSX) && !defined(OS_IOS)

  kern_return_t kr = mach_vm_deallocate(

      mach_task_self(), reinterpret_cast<mach_vm_address_t>(memory_),

      mapped_size_);

  MACH_DLOG_IF(ERROR, kr != KERN_SUCCESS, kr) << "mach_vm_deallocate";

#else

  if (munmap(memory_, mapped_size_) < 0)

    DPLOG(ERROR) << "munmap";

#endif

ReadOnlySharedMemoryMapping::ReadOnlySharedMemoryMapping() = default;

ReadOnlySharedMemoryMapping::ReadOnlySharedMemoryMapping(

    ReadOnlySharedMemoryMapping&&) noexcept = default;

ReadOnlySharedMemoryMapping& ReadOnlySharedMemoryMapping::operator=(

    ReadOnlySharedMemoryMapping&&) noexcept = default;

ReadOnlySharedMemoryMapping::ReadOnlySharedMemoryMapping(

    void* address,

    size_t size,

    size_t mapped_size,

    const UnguessableToken& guid)

    : SharedMemoryMapping(address, size, mapped_size, guid) {}

WritableSharedMemoryMapping::WritableSharedMemoryMapping() = default;

WritableSharedMemoryMapping::WritableSharedMemoryMapping(

    WritableSharedMemoryMapping&&) noexcept = default;

WritableSharedMemoryMapping& WritableSharedMemoryMapping::operator=(

    WritableSharedMemoryMapping&&) noexcept = default;

WritableSharedMemoryMapping::WritableSharedMemoryMapping(

    void* address,

    size_t size,

    size_t mapped_size,

    const UnguessableToken& guid)

    : SharedMemoryMapping(address, size, mapped_size, guid) {}

}  // namespace base