clang  9.0.0svn
HeaderMapTypes.h
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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 
14 namespace clang {
15 
16 enum {
17  HMAP_HeaderMagicNumber = ('h' << 24) | ('m' << 16) | ('a' << 8) | 'p',
20 };
21 
22 struct 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 
28 struct 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
uint32_t StringsOffset
uint32_t MaxValueLength
Dataflow Directional Tag Classes.