1 //===- SymbolTable.h --------------------------------------------*- 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 LLD_MACHO_SYMBOL_TABLE_H 10 #define LLD_MACHO_SYMBOL_TABLE_H 11 12 #include "Symbols.h" 13 14 #include "lld/Common/LLVM.h" 15 #include "llvm/ADT/CachedHashString.h" 16 #include "llvm/ADT/DenseMap.h" 17 #include "llvm/Object/Archive.h" 18 19 namespace lld { 20 namespace macho { 21 22 class ArchiveFile; 23 class DylibFile; 24 class InputFile; 25 class ObjFile; 26 class InputSection; 27 class MachHeaderSection; 28 class Symbol; 29 class Defined; 30 class Undefined; 31 32 /* 33 * Note that the SymbolTable handles name collisions by calling 34 * replaceSymbol(), which does an in-place update of the Symbol via `placement 35 * new`. Therefore, there is no need to update any relocations that hold 36 * pointers the "old" Symbol -- they will automatically point to the new one. 37 */ 38 class SymbolTable { 39 public: 40 Defined *addDefined(StringRef name, InputFile *, InputSection *, 41 uint64_t value, uint64_t size, bool isWeakDef, 42 bool isPrivateExtern, bool isThumb, 43 bool isReferencedDynamically, bool noDeadStrip, 44 bool isWeakDefCanBeHidden); 45 46 Defined *aliasDefined(Defined *src, StringRef target); 47 48 Symbol *addUndefined(StringRef name, InputFile *, bool isWeakRef); 49 50 Symbol *addCommon(StringRef name, InputFile *, uint64_t size, uint32_t align, 51 bool isPrivateExtern); 52 53 Symbol *addDylib(StringRef name, DylibFile *file, bool isWeakDef, bool isTlv); 54 Symbol *addDynamicLookup(StringRef name); 55 56 Symbol *addLazyArchive(StringRef name, ArchiveFile *file, 57 const llvm::object::Archive::Symbol &sym); 58 Symbol *addLazyObject(StringRef name, InputFile &file); 59 60 Defined *addSynthetic(StringRef name, InputSection *, uint64_t value, 61 bool isPrivateExtern, bool includeInSymtab, 62 bool referencedDynamically); 63 64 ArrayRef<Symbol *> getSymbols() const { return symVector; } 65 Symbol *find(llvm::CachedHashStringRef name); 66 Symbol *find(StringRef name) { return find(llvm::CachedHashStringRef(name)); } 67 68 private: 69 std::pair<Symbol *, bool> insert(StringRef name, const InputFile *); 70 llvm::DenseMap<llvm::CachedHashStringRef, int> symMap; 71 std::vector<Symbol *> symVector; 72 }; 73 74 void reportPendingUndefinedSymbols(); 75 76 // Call reportPendingUndefinedSymbols() to emit diagnostics. 77 void treatUndefinedSymbol(const Undefined &, StringRef source); 78 void treatUndefinedSymbol(const Undefined &, const InputSection *, 79 uint64_t offset); 80 81 extern std::unique_ptr<SymbolTable> symtab; 82 83 } // namespace macho 84 } // namespace lld 85 86 #endif 87