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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 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 <parse_context.h>
#include <message_lite.h>
// Must come last:
#include <port_def.inc>
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) {}
template <typename TagType = uint16_t>
TagType coded_tag() const {
return static_cast<TagType>(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 TcParseTableBase;
// TailCallParseFunc is the function pointer type used in the tailcall table.
typedef const char* (*TailCallParseFunc)(PROTOBUF_TC_PARAM_DECL);
#if defined(_MSC_VER) && !defined(_WIN64)
#pragma warning(push)
// TcParseTableBase is intentionally overaligned on 32 bit targets.
#pragma warning(disable : 4324)
#endif
// Base class for message-level table with info for the tail-call parser.
struct alignas(uint64_t) TcParseTableBase {
// Common attributes for message layout:
uint16_t has_bits_offset;
uint16_t extension_offset;
uint32_t extension_range_low;
uint32_t extension_range_high;
uint8_t fast_idx_mask;
uint8_t reserved;
uint16_t num_fields;
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 FastFieldEntry {
// Target function for dispatch:
TailCallParseFunc target;
// Field data used during parse:
TcFieldData bits;
};
// There is always at least one table entry.
const FastFieldEntry* fast_entry(size_t idx) const {
return reinterpret_cast<const FastFieldEntry*>(this + 1) + idx;
}
};
#if defined(_MSC_VER) && !defined(_WIN64)
#pragma warning(pop)
#endif
static_assert(sizeof(TcParseTableBase::FastFieldEntry) <= 16,
"Field entry is too big.");
template <size_t kFastTableSizeLog2>
struct TcParseTable {
TcParseTableBase 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.
TcParseTableBase::FastFieldEntry entries[(1 << kFastTableSizeLog2)];
};
static_assert(std::is_standard_layout<TcParseTable<1>>::value,
"TcParseTable must be standard layout.");
static_assert(offsetof(TcParseTable<1>, entries) == sizeof(TcParseTableBase),
"Table entries must be laid out after TcParseTableBase.");
} // namespace internal
} // namespace protobuf
} // namespace google
#include <port_undef.inc>
#endif // GOOGLE_PROTOBUF_GENERATED_MESSAGE_TCTABLE_DECL_H__
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