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1 //===- SymbolTable.h --------------------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef LLD_MACHO_SYMBOL_TABLE_H
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10 #define LLD_MACHO_SYMBOL_TABLE_H
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11
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12 #include "Symbols.h"
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13
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14 #include "lld/Common/LLVM.h"
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15 #include "llvm/ADT/CachedHashString.h"
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16 #include "llvm/ADT/DenseMap.h"
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17 #include "llvm/Object/Archive.h"
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18
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19 namespace lld {
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20 namespace macho {
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21
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22 class ArchiveFile;
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23 class DylibFile;
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24 class InputFile;
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25 class ObjFile;
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26 class InputSection;
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27 class MachHeaderSection;
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28 class Symbol;
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29 class Defined;
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30 class Undefined;
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31
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32 /*
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33 * Note that the SymbolTable handles name collisions by calling
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34 * replaceSymbol(), which does an in-place update of the Symbol via `placement
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35 * new`. Therefore, there is no need to update any relocations that hold
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36 * pointers the "old" Symbol -- they will automatically point to the new one.
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37 */
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38 class SymbolTable {
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39 public:
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40 Defined *addDefined(StringRef name, InputFile *, InputSection *,
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41 uint64_t value, uint64_t size, bool isWeakDef,
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42 bool isPrivateExtern, bool isThumb,
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43 bool isReferencedDynamically, bool noDeadStrip);
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44
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45 Symbol *addUndefined(StringRef name, InputFile *, bool isWeakRef);
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46
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47 Symbol *addCommon(StringRef name, InputFile *, uint64_t size, uint32_t align,
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48 bool isPrivateExtern);
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49
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50 Symbol *addDylib(StringRef name, DylibFile *file, bool isWeakDef, bool isTlv);
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51 Symbol *addDynamicLookup(StringRef name);
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52
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53 Symbol *addLazy(StringRef name, ArchiveFile *file,
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54 const llvm::object::Archive::Symbol &sym);
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55
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56 Defined *addSynthetic(StringRef name, InputSection *, uint64_t value,
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57 bool isPrivateExtern, bool includeInSymtab,
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58 bool referencedDynamically);
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59
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60 ArrayRef<Symbol *> getSymbols() const { return symVector; }
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61 Symbol *find(llvm::CachedHashStringRef name);
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62 Symbol *find(StringRef name) { return find(llvm::CachedHashStringRef(name)); }
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63
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64 private:
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65 std::pair<Symbol *, bool> insert(StringRef name, const InputFile *);
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66 llvm::DenseMap<llvm::CachedHashStringRef, int> symMap;
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67 std::vector<Symbol *> symVector;
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68 };
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69
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70 void treatUndefinedSymbol(const Undefined &, StringRef source = "");
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71
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72 extern SymbolTable *symtab;
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73
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74 } // namespace macho
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75 } // namespace lld
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76
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77 #endif
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