Current File : //usr/local/include/google/protobuf/generated_message_tctable_decl.h
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// This file contains declarations needed in generated headers for messages
// that use tail-call table parsing. Everything in this file is for internal
// use only.
#ifndef GOOGLE_PROTOBUF_GENERATED_MESSAGE_TCTABLE_DECL_H__
#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_TCTABLE_DECL_H__
#include <cstdint>
#include <type_traits>
#include <google/protobuf/parse_context.h>
#include <google/protobuf/message_lite.h>
namespace google {
namespace protobuf {
namespace internal {
// Additional information about this field:
struct TcFieldData {
constexpr TcFieldData() : data(0) {}
constexpr TcFieldData(uint16_t coded_tag, uint8_t hasbit_idx, uint16_t offset)
: data(static_cast<uint64_t>(offset) << 48 |
static_cast<uint64_t>(hasbit_idx) << 16 | coded_tag) {}
uint16_t coded_tag() const { return static_cast<uint16_t>(data); }
uint8_t hasbit_idx() const { return static_cast<uint8_t>(data >> 16); }
uint16_t offset() const { return static_cast<uint16_t>(data >> 48); }
uint64_t data;
};
struct TailCallParseTableBase;
// TailCallParseFunc is the function pointer type used in the tailcall table.
typedef const char* (*TailCallParseFunc)(MessageLite* msg, const char* ptr,
ParseContext* ctx,
const TailCallParseTableBase* table,
uint64_t hasbits, TcFieldData data);
// Base class for message-level table with info for the tail-call parser.
struct TailCallParseTableBase {
// Common attributes for message layout:
uint16_t has_bits_offset;
uint16_t extension_offset;
uint32_t extension_range_low;
uint32_t extension_range_high;
uint32_t has_bits_required_mask;
const MessageLite* default_instance;
// Handler for fields which are not handled by table dispatch.
TailCallParseFunc fallback;
// Table entry for fast-path tailcall dispatch handling.
struct FieldEntry {
// Target function for dispatch:
TailCallParseFunc target;
// Field data used during parse:
TcFieldData bits;
};
// There is always at least one table entry.
const FieldEntry* table() const {
return reinterpret_cast<const FieldEntry*>(this + 1);
}
};
static_assert(sizeof(TailCallParseTableBase::FieldEntry) <= 16,
"Field entry is too big.");
template <size_t kTableSizeLog2>
struct TailCallParseTable {
TailCallParseTableBase header;
// Entries for each field.
//
// Fields are indexed by the lowest bits of their field number. The field
// number is masked to fit inside the table. Note that the parsing logic
// generally calls `TailCallParseTableBase::table()` instead of accessing
// this field directly.
TailCallParseTableBase::FieldEntry entries[(1 << kTableSizeLog2)];
};
static_assert(std::is_standard_layout<TailCallParseTable<1>>::value,
"TailCallParseTable must be standard layout.");
static_assert(offsetof(TailCallParseTable<1>, entries) ==
sizeof(TailCallParseTableBase),
"Table entries must be laid out after TailCallParseTableBase.");
} // namespace internal
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_GENERATED_MESSAGE_TCTABLE_DECL_H__
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