1//===- HeaderMapTypes.h - Types for the header map format -------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef LLVM_CLANG_LEX_HEADERMAPTYPES_H
11#define LLVM_CLANG_LEX_HEADERMAPTYPES_H
12
13#include <cstdint>
14
15namespace clang {
16
17enum {
18  HMAP_HeaderMagicNumber = ('h' << 24) | ('m' << 16) | ('a' << 8) | 'p',
19  HMAP_HeaderVersion = 1,
20  HMAP_EmptyBucketKey = 0
21};
22
23struct HMapBucket {
24  uint32_t Key;    // Offset (into strings) of key.
25  uint32_t Prefix; // Offset (into strings) of value prefix.
26  uint32_t Suffix; // Offset (into strings) of value suffix.
27};
28
29struct HMapHeader {
30  uint32_t Magic;          // Magic word, also indicates byte order.
31  uint16_t Version;        // Version number -- currently 1.
32  uint16_t Reserved;       // Reserved for future use - zero for now.
33  uint32_t StringsOffset;  // Offset to start of string pool.
34  uint32_t NumEntries;     // Number of entries in the string table.
35  uint32_t NumBuckets;     // Number of buckets (always a power of 2).
36  uint32_t MaxValueLength; // Length of longest result path (excluding nul).
37  // An array of 'NumBuckets' HMapBucket objects follows this header.
38  // Strings follow the buckets, at StringsOffset.
39};
40
41} // end namespace clang.
42
43#endif
44