clang  6.0.0svn
HeaderMapTypes.h
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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 
15 namespace clang {
16 
17 enum {
18  HMAP_HeaderMagicNumber = ('h' << 24) | ('m' << 16) | ('a' << 8) | 'p',
21 };
22 
23 struct 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 
29 struct 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
uint32_t StringsOffset
uint32_t MaxValueLength
Dataflow Directional Tag Classes.