Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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75 lines
2.0 KiB
75 lines
2.0 KiB
12 years ago
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/*
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* upb - a minimalist implementation of protocol buffers.
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*
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* Copyright (c) 2013 Google Inc. See LICENSE for details.
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* Author: Josh Haberman <jhaberman@gmail.com>
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*
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* For handlers that do very tiny, very simple operations, the function call
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* overhead of calling a handler can be significant. This file allows the
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* user to define handlers that do something very simple like store the value
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* to memory and/or set a hasbit. JIT compilers can then special-case these
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* handlers and emit specialized code for them instead of actually calling the
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* handler.
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*
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* The functionality is very simple/limited right now but may expand to be able
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* to call another function.
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*/
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#ifndef UPB_SHIM_H
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#define UPB_SHIM_H
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#include "upb/handlers.h"
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typedef struct {
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size_t offset;
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int32_t hasbit;
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} upb_shim_data;
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#ifdef __cplusplus
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namespace upb {
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struct Shim {
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typedef upb_shim_data Data;
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// Sets a handler for the given field that writes the value to the given
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// offset and, if hasbit >= 0, sets a bit at the given bit offset. Returns
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// true if the handler was set successfully.
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static bool Set(Handlers *h, const FieldDef *f, size_t ofs, int32_t hasbit);
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// If this handler is a shim, returns the corresponding upb::Shim::Data.
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// Otherwise returns NULL.
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static const Data* GetData(const Handlers* h, Handlers::Selector s);
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};
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} // namespace upb
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extern "C" {
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#endif
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// C API.
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bool upb_shim_set(upb_handlers *h, const upb_fielddef *f, size_t offset,
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int32_t hasbit);
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const upb_shim_data *upb_shim_getdata(const upb_handlers *h, upb_selector_t s);
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#ifdef __cplusplus
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} // extern "C"
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namespace upb {
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// C++ Wrappers.
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inline bool Shim::Set(Handlers* h, const FieldDef* f, size_t ofs,
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int32_t hasbit) {
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return upb_shim_set(h, f, ofs, hasbit);
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}
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inline const Shim::Data* Shim::GetData(const Handlers* h,
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Handlers::Selector s) {
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return upb_shim_getdata(h, s);
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}
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} // namespace
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#endif
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#endif // UPB_SHIM_H
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