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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_COFF_SYMBOL_TABLE_H
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10 #define LLD_COFF_SYMBOL_TABLE_H
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11
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12 #include "InputFiles.h"
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13 #include "LTO.h"
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14 #include "llvm/ADT/CachedHashString.h"
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15 #include "llvm/ADT/DenseMap.h"
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16 #include "llvm/ADT/DenseMapInfo.h"
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17 #include "llvm/Support/raw_ostream.h"
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18
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19 namespace llvm {
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20 struct LTOCodeGenerator;
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21 }
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22
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23 namespace lld {
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24 namespace coff {
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25
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26 class Chunk;
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27 class CommonChunk;
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28 class Defined;
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29 class DefinedAbsolute;
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30 class DefinedRegular;
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31 class DefinedRelative;
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32 class LazyArchive;
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33 class SectionChunk;
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34 class Symbol;
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35
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36 // SymbolTable is a bucket of all known symbols, including defined,
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37 // undefined, or lazy symbols (the last one is symbols in archive
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38 // files whose archive members are not yet loaded).
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39 //
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40 // We put all symbols of all files to a SymbolTable, and the
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41 // SymbolTable selects the "best" symbols if there are name
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42 // conflicts. For example, obviously, a defined symbol is better than
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43 // an undefined symbol. Or, if there's a conflict between a lazy and a
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44 // undefined, it'll read an archive member to read a real definition
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45 // to replace the lazy symbol. The logic is implemented in the
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46 // add*() functions, which are called by input files as they are parsed.
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47 // There is one add* function per symbol type.
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48 class SymbolTable {
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49 public:
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50 void addFile(InputFile *file);
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51
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52 // Emit errors for symbols that cannot be resolved.
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53 void reportUnresolvable();
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54
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55 // Try to resolve any undefined symbols and update the symbol table
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56 // accordingly, then print an error message for any remaining undefined
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57 // symbols and warn about imported local symbols.
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58 void resolveRemainingUndefines();
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59
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60 void loadMinGWAutomaticImports();
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61 bool handleMinGWAutomaticImport(Symbol *sym, StringRef name);
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62
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63 // Returns a list of chunks of selected symbols.
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64 std::vector<Chunk *> getChunks();
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65
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66 // Returns a symbol for a given name. Returns a nullptr if not found.
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67 Symbol *find(StringRef name);
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68 Symbol *findUnderscore(StringRef name);
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69
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70 // Occasionally we have to resolve an undefined symbol to its
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71 // mangled symbol. This function tries to find a mangled name
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72 // for U from the symbol table, and if found, set the symbol as
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73 // a weak alias for U.
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74 Symbol *findMangle(StringRef name);
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75
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76 // Build a set of COFF objects representing the combined contents of
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77 // BitcodeFiles and add them to the symbol table. Called after all files are
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78 // added and before the writer writes results to a file.
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79 void addCombinedLTOObjects();
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80
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81 // Creates an Undefined symbol for a given name.
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82 Symbol *addUndefined(StringRef name);
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83
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84 Symbol *addSynthetic(StringRef n, Chunk *c);
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85 Symbol *addAbsolute(StringRef n, uint64_t va);
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86
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87 Symbol *addUndefined(StringRef name, InputFile *f, bool isWeakAlias);
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88 void addLazyArchive(ArchiveFile *f, const Archive::Symbol &sym);
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89 void addLazyObject(LazyObjFile *f, StringRef n);
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90 Symbol *addAbsolute(StringRef n, COFFSymbolRef s);
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91 Symbol *addRegular(InputFile *f, StringRef n,
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92 const llvm::object::coff_symbol_generic *s = nullptr,
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93 SectionChunk *c = nullptr, uint32_t sectionOffset = 0);
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94 std::pair<DefinedRegular *, bool>
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95 addComdat(InputFile *f, StringRef n,
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96 const llvm::object::coff_symbol_generic *s = nullptr);
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97 Symbol *addCommon(InputFile *f, StringRef n, uint64_t size,
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98 const llvm::object::coff_symbol_generic *s = nullptr,
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99 CommonChunk *c = nullptr);
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100 Symbol *addImportData(StringRef n, ImportFile *f);
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101 Symbol *addImportThunk(StringRef name, DefinedImportData *s,
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102 uint16_t machine);
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103 void addLibcall(StringRef name);
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104
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105 void reportDuplicate(Symbol *existing, InputFile *newFile,
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106 SectionChunk *newSc = nullptr,
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107 uint32_t newSectionOffset = 0);
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108
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109 // A list of chunks which to be added to .rdata.
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110 std::vector<Chunk *> localImportChunks;
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111
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112 // Iterates symbols in non-determinstic hash table order.
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113 template <typename T> void forEachSymbol(T callback) {
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114 for (auto &pair : symMap)
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115 callback(pair.second);
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116 }
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117
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118 private:
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119 /// Given a name without "__imp_" prefix, returns a defined symbol
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120 /// with the "__imp_" prefix, if it exists.
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121 Defined *impSymbol(StringRef name);
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122 /// Inserts symbol if not already present.
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123 std::pair<Symbol *, bool> insert(StringRef name);
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124 /// Same as insert(Name), but also sets isUsedInRegularObj.
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125 std::pair<Symbol *, bool> insert(StringRef name, InputFile *f);
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126
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127 std::vector<Symbol *> getSymsWithPrefix(StringRef prefix);
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128
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129 llvm::DenseMap<llvm::CachedHashStringRef, Symbol *> symMap;
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130 std::unique_ptr<BitcodeCompiler> lto;
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131 };
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132
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133 extern SymbolTable *symtab;
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134
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135 std::vector<std::string> getSymbolLocations(ObjFile *file, uint32_t symIndex);
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136
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137 } // namespace coff
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138 } // namespace lld
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139
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140 #endif
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