1 //===-- StringTableBuilder.cpp - String table building utility ------------===// 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 #include "llvm/MC/StringTableBuilder.h" 11 #include "llvm/ADT/SmallVector.h" 12 13 using namespace llvm; 14 15 static bool compareBySuffix(StringRef a, StringRef b) { 16 size_t sizeA = a.size(); 17 size_t sizeB = b.size(); 18 size_t len = std::min(sizeA, sizeB); 19 for (size_t i = 0; i < len; ++i) { 20 char ca = a[sizeA - i - 1]; 21 char cb = b[sizeB - i - 1]; 22 if (ca != cb) 23 return ca > cb; 24 } 25 return sizeA > sizeB; 26 } 27 28 void StringTableBuilder::finalize() { 29 SmallVector<StringRef, 8> Strings; 30 for (auto i = StringIndexMap.begin(), e = StringIndexMap.end(); i != e; ++i) 31 Strings.push_back(i->getKey()); 32 33 std::sort(Strings.begin(), Strings.end(), compareBySuffix); 34 35 // FIXME: Starting with a null byte is ELF specific. Generalize this so we 36 // can use the class with other object formats. 37 StringTable += '\x00'; 38 39 StringRef Previous; 40 for (StringRef s : Strings) { 41 if (Previous.endswith(s)) { 42 StringIndexMap[s] = StringTable.size() - 1 - s.size(); 43 continue; 44 } 45 46 StringIndexMap[s] = StringTable.size(); 47 StringTable += s; 48 StringTable += '\x00'; 49 Previous = s; 50 } 51 } 52
