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4cab6ac723
This moves parts of IPCMessageUtils.h to two new header files and adapts the include directives as necessary. The new header files are: - EnumSerializer.h, which defines the templates for enum serializers - IPCMessageUtilsSpecializations.h, which defines template specializations of ParamTraits with extra dependencies (building upon both IPCMessageUtils.h and EnumSerializer.h) This should minimize the dependencies pulled in by every consumer of IPCMessageUtils.h Differential Revision: https://phabricator.services.mozilla.com/D94459
130 lines
3.9 KiB
C++
130 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __IPC_GLUE_SERIALIZEDSTRUCTUREDCLONEBUFFER_H__
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#define __IPC_GLUE_SERIALIZEDSTRUCTUREDCLONEBUFFER_H__
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#include <algorithm>
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#include <cstdint>
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#include <cstdlib>
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#include <string>
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#include <utility>
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#include "chrome/common/ipc_message.h"
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#include "chrome/common/ipc_message_utils.h"
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#include "js/AllocPolicy.h"
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#include "js/StructuredClone.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/BufferList.h"
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#include "mozilla/Vector.h"
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#include "mozilla/mozalloc.h"
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class PickleIterator;
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namespace mozilla {
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template <typename...>
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class Variant;
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namespace detail {
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template <typename...>
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struct VariantTag;
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}
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} // namespace mozilla
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namespace mozilla {
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struct SerializedStructuredCloneBuffer final {
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SerializedStructuredCloneBuffer() = default;
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SerializedStructuredCloneBuffer(SerializedStructuredCloneBuffer&&) = default;
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SerializedStructuredCloneBuffer& operator=(
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SerializedStructuredCloneBuffer&&) = default;
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SerializedStructuredCloneBuffer(const SerializedStructuredCloneBuffer&) =
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delete;
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SerializedStructuredCloneBuffer& operator=(
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const SerializedStructuredCloneBuffer& aOther) = delete;
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bool operator==(const SerializedStructuredCloneBuffer& aOther) const {
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// The copy assignment operator and the equality operator are
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// needed by the IPDL generated code. We relied on the copy
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// assignment operator at some places but we never use the
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// equality operator.
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return false;
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}
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JSStructuredCloneData data{JS::StructuredCloneScope::Unassigned};
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};
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} // namespace mozilla
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namespace IPC {
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template <>
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struct ParamTraits<JSStructuredCloneData> {
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typedef JSStructuredCloneData paramType;
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static void Write(Message* aMsg, const paramType& aParam) {
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MOZ_ASSERT(!(aParam.Size() % sizeof(uint64_t)));
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WriteParam(aMsg, aParam.Size());
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aParam.ForEachDataChunk([&](const char* aData, size_t aSize) {
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return aMsg->WriteBytes(aData, aSize, sizeof(uint64_t));
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});
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}
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static bool Read(const Message* aMsg, PickleIterator* aIter,
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paramType* aResult) {
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size_t length = 0;
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if (!ReadParam(aMsg, aIter, &length)) {
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return false;
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}
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MOZ_ASSERT(!(length % sizeof(uint64_t)));
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mozilla::BufferList<InfallibleAllocPolicy> buffers(0, 0, 4096);
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// Borrowing is not suitable to use for IPC to hand out data
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// because we often want to store the data somewhere for
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// processing after IPC has released the underlying buffers. One
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// case is PContentChild::SendGetXPCOMProcessAttributes. We can't
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// return a borrowed buffer because the out param outlives the
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// IPDL callback.
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if (length &&
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!aMsg->ExtractBuffers(aIter, length, &buffers, sizeof(uint64_t))) {
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return false;
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}
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bool success;
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mozilla::BufferList<js::SystemAllocPolicy> out =
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buffers.MoveFallible<js::SystemAllocPolicy>(&success);
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if (!success) {
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return false;
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}
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*aResult = JSStructuredCloneData(
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std::move(out), JS::StructuredCloneScope::DifferentProcess);
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return true;
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}
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};
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template <>
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struct ParamTraits<mozilla::SerializedStructuredCloneBuffer> {
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typedef mozilla::SerializedStructuredCloneBuffer paramType;
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static void Write(Message* aMsg, const paramType& aParam) {
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WriteParam(aMsg, aParam.data);
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}
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static bool Read(const Message* aMsg, PickleIterator* aIter,
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paramType* aResult) {
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return ReadParam(aMsg, aIter, &aResult->data);
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}
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static void Log(const paramType& aParam, std::wstring* aLog) {
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LogParam(aParam.data.Size(), aLog);
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}
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};
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} // namespace IPC
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#endif /* __IPC_GLUE_SERIALIZEDSTRUCTUREDCLONEBUFFER_H__ */
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