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