93 lines
3.3 KiB
C++
93 lines
3.3 KiB
C++
//===-- MsgPack.h - MessagePack Constants -----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file contains constants used for implementing MessagePack support.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_BINARYFORMAT_MSGPACK_H
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#define LLVM_BINARYFORMAT_MSGPACK_H
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/Endian.h"
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namespace llvm {
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namespace msgpack {
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/// The endianness of all multi-byte encoded values in MessagePack.
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constexpr support::endianness Endianness = support::big;
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/// The first byte identifiers of MessagePack object formats.
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namespace FirstByte {
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#define HANDLE_MP_FIRST_BYTE(ID, NAME) constexpr uint8_t NAME = ID;
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#include "llvm/BinaryFormat/MsgPack.def"
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}
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/// Most significant bits used to identify "Fix" variants in MessagePack.
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///
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/// For example, FixStr objects encode their size in the five least significant
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/// bits of their first byte, which is identified by the bit pattern "101" in
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/// the three most significant bits. So FixBits::String contains 0b10100000.
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///
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/// A corresponding mask of the bit pattern is found in \c FixBitsMask.
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namespace FixBits {
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#define HANDLE_MP_FIX_BITS(ID, NAME) constexpr uint8_t NAME = ID;
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#include "llvm/BinaryFormat/MsgPack.def"
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}
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/// Mask of bits used to identify "Fix" variants in MessagePack.
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///
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/// For example, FixStr objects encode their size in the five least significant
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/// bits of their first byte, which is identified by the bit pattern "101" in
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/// the three most significant bits. So FixBitsMask::String contains
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/// 0b11100000.
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///
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/// The corresponding bit pattern to mask for is found in FixBits.
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namespace FixBitsMask {
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#define HANDLE_MP_FIX_BITS_MASK(ID, NAME) constexpr uint8_t NAME = ID;
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#include "llvm/BinaryFormat/MsgPack.def"
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}
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/// The maximum value or size encodable in "Fix" variants of formats.
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///
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/// For example, FixStr objects encode their size in the five least significant
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/// bits of their first byte, so the largest encodable size is 0b00011111.
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namespace FixMax {
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#define HANDLE_MP_FIX_MAX(ID, NAME) constexpr uint8_t NAME = ID;
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#include "llvm/BinaryFormat/MsgPack.def"
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}
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/// The exact size encodable in "Fix" variants of formats.
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///
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/// The only objects for which an exact size makes sense are of Extension type.
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///
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/// For example, FixExt4 stores an extension type containing exactly four bytes.
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namespace FixLen {
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#define HANDLE_MP_FIX_LEN(ID, NAME) constexpr uint8_t NAME = ID;
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#include "llvm/BinaryFormat/MsgPack.def"
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}
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/// The minimum value or size encodable in "Fix" variants of formats.
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///
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/// The only object for which a minimum makes sense is a negative FixNum.
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///
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/// Negative FixNum objects encode their signed integer value in one byte, but
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/// they must have the pattern "111" as their three most significant bits. This
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/// means all values are negative, and the smallest representable value is
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/// 0b11100000.
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namespace FixMin {
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#define HANDLE_MP_FIX_MIN(ID, NAME) constexpr int8_t NAME = ID;
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#include "llvm/BinaryFormat/MsgPack.def"
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}
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} // end namespace msgpack
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} // end namespace llvm
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#endif // LLVM_BINARYFORMAT_MSGPACK_H
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