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', 18 HMAP_HeaderVersion = 1, 19 HMAP_EmptyBucketKey = 0 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 43