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116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/memory/shared_memory_mapping.h"
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#include <utility>
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#include "base/logging.h"
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#include "base/memory/shared_memory_tracker.h"
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#include "base/unguessable_token.h"
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#include "build/build_config.h"
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#if defined(OS_POSIX)
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#include <sys/mman.h>
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#endif
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#if defined(OS_WIN)
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#include <aclapi.h>
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#endif
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#if defined(OS_MACOSX) && !defined(OS_IOS)
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#include <mach/mach_vm.h>
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#include "base/mac/mach_logging.h"
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#endif
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#if defined(OS_FUCHSIA)
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#include <zircon/process.h>
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#include <zircon/status.h>
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#include <zircon/syscalls.h>
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#endif
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namespace base {
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SharedMemoryMapping::SharedMemoryMapping() = default;
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SharedMemoryMapping::SharedMemoryMapping(SharedMemoryMapping&& mapping)
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: memory_(mapping.memory_),
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size_(mapping.size_),
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mapped_size_(mapping.mapped_size_),
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guid_(mapping.guid_) {
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mapping.memory_ = nullptr;
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}
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SharedMemoryMapping& SharedMemoryMapping::operator=(
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SharedMemoryMapping&& mapping) {
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Unmap();
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memory_ = mapping.memory_;
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size_ = mapping.size_;
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mapped_size_ = mapping.mapped_size_;
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guid_ = mapping.guid_;
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mapping.memory_ = nullptr;
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return *this;
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}
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SharedMemoryMapping::~SharedMemoryMapping() {
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Unmap();
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}
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SharedMemoryMapping::SharedMemoryMapping(void* memory,
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size_t size,
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size_t mapped_size,
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const UnguessableToken& guid)
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: memory_(memory), size_(size), mapped_size_(mapped_size), guid_(guid) {
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SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);
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}
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void SharedMemoryMapping::Unmap() {
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if (!IsValid())
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return;
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SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);
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#if defined(OS_WIN)
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if (!UnmapViewOfFile(memory_))
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DPLOG(ERROR) << "UnmapViewOfFile";
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#elif defined(OS_FUCHSIA)
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uintptr_t addr = reinterpret_cast<uintptr_t>(memory_);
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zx_status_t status = zx_vmar_unmap(zx_vmar_root_self(), addr, size_);
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DLOG_IF(ERROR, status != ZX_OK)
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<< "zx_vmar_unmap failed: " << zx_status_get_string(status);
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#elif defined(OS_MACOSX) && !defined(OS_IOS)
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kern_return_t kr = mach_vm_deallocate(
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mach_task_self(), reinterpret_cast<mach_vm_address_t>(memory_), size_);
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MACH_DLOG_IF(ERROR, kr != KERN_SUCCESS, kr) << "mach_vm_deallocate";
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#else
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if (munmap(memory_, size_) < 0)
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DPLOG(ERROR) << "munmap";
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#endif
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}
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ReadOnlySharedMemoryMapping::ReadOnlySharedMemoryMapping() = default;
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ReadOnlySharedMemoryMapping::ReadOnlySharedMemoryMapping(
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ReadOnlySharedMemoryMapping&&) = default;
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ReadOnlySharedMemoryMapping& ReadOnlySharedMemoryMapping::operator=(
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ReadOnlySharedMemoryMapping&&) = default;
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ReadOnlySharedMemoryMapping::ReadOnlySharedMemoryMapping(
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void* address,
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size_t size,
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size_t mapped_size,
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const UnguessableToken& guid)
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: SharedMemoryMapping(address, size, mapped_size, guid) {}
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WritableSharedMemoryMapping::WritableSharedMemoryMapping() = default;
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WritableSharedMemoryMapping::WritableSharedMemoryMapping(
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WritableSharedMemoryMapping&&) = default;
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WritableSharedMemoryMapping& WritableSharedMemoryMapping::operator=(
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WritableSharedMemoryMapping&&) = default;
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WritableSharedMemoryMapping::WritableSharedMemoryMapping(
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void* address,
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size_t size,
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size_t mapped_size,
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const UnguessableToken& guid)
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: SharedMemoryMapping(address, size, mapped_size, guid) {}
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} // namespace base
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