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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
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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