1//===- HeaderMapTypes.h - Types for the header map format -------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_CLANG_LEX_HEADERMAPTYPES_H
10#define LLVM_CLANG_LEX_HEADERMAPTYPES_H
11
12#include <cstdint>
13
14namespace clang {
15
16enum {
17 HMAP_HeaderMagicNumber = ('h' << 24) | ('m' << 16) | ('a' << 8) | 'p',
18 HMAP_HeaderVersion = 1,
19 HMAP_EmptyBucketKey = 0
20};
21
22struct HMapBucket {
23 uint32_t Key; // Offset (into strings) of key.
24 uint32_t Prefix; // Offset (into strings) of value prefix.
25 uint32_t Suffix; // Offset (into strings) of value suffix.
26};
27
28struct HMapHeader {
29 uint32_t Magic; // Magic word, also indicates byte order.
30 uint16_t Version; // Version number -- currently 1.
31 uint16_t Reserved; // Reserved for future use - zero for now.
32 uint32_t StringsOffset; // Offset to start of string pool.
33 uint32_t NumEntries; // Number of entries in the string table.
34 uint32_t NumBuckets; // Number of buckets (always a power of 2).
35 uint32_t MaxValueLength; // Length of longest result path (excluding nul).
36 // An array of 'NumBuckets' HMapBucket objects follows this header.
37 // Strings follow the buckets, at StringsOffset.
38};
39
40} // end namespace clang.
41
42#endif
43