Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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79 lines
2.3 KiB
79 lines
2.3 KiB
// Protocol Buffers - Google's data interchange format |
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// Copyright 2024 Google LLC. All rights reserved. |
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// |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file or at |
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// https://developers.google.com/open-source/licenses/bsd |
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#ifndef GOOGLE_PROTOBUF_HPB_BACKEND_UPB_INTEROP_H__ |
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#define GOOGLE_PROTOBUF_HPB_BACKEND_UPB_INTEROP_H__ |
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// The sole public header in hpb/backend/upb |
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#include "google/protobuf/hpb/internal/internal.h" |
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#include "google/protobuf/hpb/ptr.h" |
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#include "upb/mem/arena.h" |
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#include "upb/message/message.h" |
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#include "upb/mini_table/message.h" |
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namespace hpb::interop::upb { |
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template <typename T> |
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const upb_MiniTable* GetMiniTable(const T*) { |
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return T::minitable(); |
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} |
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template <typename T> |
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const upb_MiniTable* GetMiniTable(Ptr<T>) { |
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return T::minitable(); |
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} |
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template <typename T> |
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upb_Arena* GetArena(Ptr<T> message) { |
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return static_cast<upb_Arena*>(message->GetInternalArena()); |
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} |
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template <typename T> |
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upb_Arena* GetArena(T* message) { |
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return static_cast<upb_Arena*>(message->GetInternalArena()); |
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} |
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/** |
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* Creates a const Handle to a upb message. |
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* |
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* The supplied arena must outlive the hpb handle. |
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* All messages reachable from from the upb message must |
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* outlive the hpb handle. |
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* |
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* That is: |
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* upb allows message M on arena A to point to message M' on |
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* arena A'. As a user of hpb, you must guarantee that both A and A' |
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* outlive M and M'. In practice, this is enforced by using upb::Fuse, |
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* or manual tracking. |
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* |
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* The upb message must not be mutated directly while the handle is alive. |
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* |
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* T must match actual type of `msg`. |
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* TODO: b/361596328 - revisit GetArena for CHandles |
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* TODO: b/362743843 - consider passing in MiniTable to ensure match |
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*/ |
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template <typename T> |
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typename T::CProxy MakeCHandle(const upb_Message* msg, upb_Arena* arena) { |
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return hpb::internal::PrivateAccess::CProxy<T>(msg, arena); |
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} |
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/** |
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* Creates a Handle to a mutable upb message. |
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* |
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* The supplied arena must outlive the hpb handle. |
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* All messages reachable from from the upb message must |
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* outlive the hpb handle. |
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*/ |
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template <typename T> |
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typename T::Proxy MakeHandle(upb_Message* msg, upb_Arena* arena) { |
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return typename T::Proxy(msg, arena); |
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} |
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} // namespace hpb::interop::upb |
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#endif // GOOGLE_PROTOBUF_HPB_BACKEND_UPB_INTEROP_H__
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