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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 "mojo/core/platform_shared_memory_mapping.h"
- #include <type_traits>
- #include <utility>
- #include "base/check.h"
- #include "base/memory/read_only_shared_memory_region.h"
- #include "base/memory/unsafe_shared_memory_region.h"
- #include "base/memory/writable_shared_memory_region.h"
- #include "build/build_config.h"
- namespace mojo {
- namespace core {
- PlatformSharedMemoryMapping::PlatformSharedMemoryMapping(
- base::subtle::PlatformSharedMemoryRegion* region,
- size_t offset,
- size_t length) {
- switch (region->GetMode()) {
- case base::subtle::PlatformSharedMemoryRegion::Mode::kReadOnly: {
- auto read_only_region =
- base::ReadOnlySharedMemoryRegion::Deserialize(std::move(*region));
- mapping_ = read_only_region.MapAt(offset, length);
- *region = base::ReadOnlySharedMemoryRegion::TakeHandleForSerialization(
- std::move(read_only_region));
- return;
- }
- case base::subtle::PlatformSharedMemoryRegion::Mode::kUnsafe: {
- auto unsafe_region =
- base::UnsafeSharedMemoryRegion::Deserialize(std::move(*region));
- mapping_ = unsafe_region.MapAt(offset, length);
- *region = base::UnsafeSharedMemoryRegion::TakeHandleForSerialization(
- std::move(unsafe_region));
- return;
- }
- case base::subtle::PlatformSharedMemoryRegion::Mode::kWritable: {
- auto writable_region =
- base::WritableSharedMemoryRegion::Deserialize(std::move(*region));
- mapping_ = writable_region.MapAt(offset, length);
- *region = base::WritableSharedMemoryRegion::TakeHandleForSerialization(
- std::move(writable_region));
- return;
- }
- }
- CHECK(false);
- }
- PlatformSharedMemoryMapping::~PlatformSharedMemoryMapping() = default;
- bool PlatformSharedMemoryMapping::IsValid() const {
- return absl::visit(
- [](const auto& member) {
- using T = std::decay_t<decltype(member)>;
- if constexpr (std::is_same_v<T, absl::monostate>) {
- return false;
- } else {
- return member.IsValid();
- }
- },
- mapping_);
- }
- void* PlatformSharedMemoryMapping::GetBase() const {
- return absl::visit(
- [](const auto& member) -> void* {
- using T = std::decay_t<decltype(member)>;
- if constexpr (std::is_same_v<T, absl::monostate>) {
- return nullptr;
- } else {
- return const_cast<void*>(member.memory());
- }
- },
- mapping_);
- }
- size_t PlatformSharedMemoryMapping::GetLength() const {
- return absl::visit(
- [](const auto& member) -> size_t {
- using T = std::decay_t<decltype(member)>;
- if constexpr (std::is_same_v<T, absl::monostate>) {
- return 0;
- } else {
- return member.size();
- }
- },
- mapping_);
- }
- } // namespace core
- } // namespace mojo
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