1 //===- unittests/Lex/HeaderMapTestUtils.h - HeaderMap utils -------===// 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_UNITTESTS_LEX_HEADERMAPTESTUTILS_H 10 #define LLVM_CLANG_UNITTESTS_LEX_HEADERMAPTESTUTILS_H 11 12 #include "clang/Basic/CharInfo.h" 13 #include "clang/Lex/HeaderMap.h" 14 #include "clang/Lex/HeaderMapTypes.h" 15 #include "llvm/Support/SwapByteOrder.h" 16 #include <cassert> 17 18 namespace clang { 19 namespace test { 20 21 // Lay out a header file for testing. 22 template <unsigned NumBuckets, unsigned NumBytes> struct HMapFileMock { 23 HMapHeader Header; 24 HMapBucket Buckets[NumBuckets]; 25 unsigned char Bytes[NumBytes]; 26 initHMapFileMock27 void init() { 28 memset(this, 0, sizeof(HMapFileMock)); 29 Header.Magic = HMAP_HeaderMagicNumber; 30 Header.Version = HMAP_HeaderVersion; 31 Header.NumBuckets = NumBuckets; 32 Header.StringsOffset = sizeof(Header) + sizeof(Buckets); 33 } 34 swapBytesHMapFileMock35 void swapBytes() { 36 Header.Magic = llvm::byteswap(Header.Magic); 37 Header.Version = llvm::byteswap(Header.Version); 38 Header.NumBuckets = llvm::byteswap(Header.NumBuckets); 39 Header.StringsOffset = llvm::byteswap(Header.StringsOffset); 40 } 41 getBufferHMapFileMock42 std::unique_ptr<llvm::MemoryBuffer> getBuffer() { 43 return llvm::MemoryBuffer::getMemBuffer( 44 StringRef(reinterpret_cast<char *>(this), sizeof(HMapFileMock)), 45 "header", 46 /* RequresNullTerminator */ false); 47 } 48 }; 49 50 template <class FileTy> struct HMapFileMockMaker { 51 FileTy &File; 52 unsigned SI = 1; 53 unsigned BI = 0; HMapFileMockMakerHMapFileMockMaker54 HMapFileMockMaker(FileTy &File) : File(File) {} 55 addStringHMapFileMockMaker56 unsigned addString(StringRef S) { 57 assert(SI + S.size() + 1 <= sizeof(File.Bytes)); 58 std::copy(S.begin(), S.end(), File.Bytes + SI); 59 auto OldSI = SI; 60 SI += S.size() + 1; 61 return OldSI; 62 } 63 addBucketHMapFileMockMaker64 void addBucket(StringRef Str, unsigned Key, unsigned Prefix, 65 unsigned Suffix) { 66 addBucket(getHash(Str), Key, Prefix, Suffix); 67 } 68 addBucketHMapFileMockMaker69 void addBucket(unsigned Hash, unsigned Key, unsigned Prefix, 70 unsigned Suffix) { 71 assert(!(File.Header.NumBuckets & (File.Header.NumBuckets - 1))); 72 unsigned I = Hash & (File.Header.NumBuckets - 1); 73 do { 74 if (!File.Buckets[I].Key) { 75 File.Buckets[I].Key = Key; 76 File.Buckets[I].Prefix = Prefix; 77 File.Buckets[I].Suffix = Suffix; 78 ++File.Header.NumEntries; 79 return; 80 } 81 ++I; 82 I &= File.Header.NumBuckets - 1; 83 } while (I != (Hash & (File.Header.NumBuckets - 1))); 84 llvm_unreachable("no empty buckets"); 85 } 86 87 // The header map hash function. getHashHMapFileMockMaker88 static unsigned getHash(StringRef Str) { 89 unsigned Result = 0; 90 for (char C : Str) 91 Result += toLowercase(C) * 13; 92 return Result; 93 } 94 }; 95 96 } // namespace test 97 } // namespace clang 98 99 #endif 100