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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
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