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📄 AArch64ErrataFix.cpp(25.49 KB)
📄 AArch64ErrataFix.h(1.35 KB)
📄 ARMErrataFix.cpp(21.67 KB)
📄 ARMErrataFix.h(1.38 KB)
📁 Arch
📄 CallGraphSort.cpp(8.81 KB)
📄 CallGraphSort.h(652 B)
📄 Config.h(10.49 KB)
📄 DWARF.cpp(5.75 KB)
📄 DWARF.h(2.97 KB)
📄 Driver.cpp(80.51 KB)
📄 Driver.h(2.1 KB)
📄 DriverUtils.cpp(8.74 KB)
📄 EhFrame.cpp(5.42 KB)
📄 EhFrame.h(680 B)
📄 ICF.cpp(19.74 KB)
📄 ICF.h(531 B)
📄 InputFiles.cpp(63.74 KB)
📄 InputFiles.h(12.88 KB)
📄 InputSection.cpp(54.78 KB)
📄 InputSection.h(14 KB)
📄 LTO.cpp(12.64 KB)
📄 LTO.h(1.65 KB)
📄 LinkerScript.cpp(44.6 KB)
📄 LinkerScript.h(10.59 KB)
📄 MapFile.cpp(9.1 KB)
📄 MapFile.h(581 B)
📄 MarkLive.cpp(14.18 KB)
📄 MarkLive.h(566 B)
📄 Options.td(27.47 KB)
📄 OutputSections.cpp(19.23 KB)
📄 OutputSections.h(4.73 KB)
📄 README.md(20 B)
📄 Relocations.cpp(81.61 KB)
📄 Relocations.h(5.89 KB)
📄 ScriptLexer.cpp(8.99 KB)
📄 ScriptLexer.h(1.31 KB)
📄 ScriptParser.cpp(48.05 KB)
📄 ScriptParser.h(961 B)
📄 SymbolTable.cpp(9.72 KB)
📄 SymbolTable.h(3.62 KB)
📄 Symbols.cpp(23.27 KB)
📄 Symbols.h(20.34 KB)
📄 SyntheticSections.cpp(134.95 KB)
📄 SyntheticSections.h(40.28 KB)
📄 Target.cpp(5.79 KB)
📄 Target.h(10.89 KB)
📄 Thunks.cpp(35.71 KB)
📄 Thunks.h(2.69 KB)
📄 Writer.cpp(108.98 KB)
📄 Writer.h(1.79 KB)

Editing: SymbolTable.h

//===- SymbolTable.h --------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef LLD_ELF_SYMBOL_TABLE_H
#define LLD_ELF_SYMBOL_TABLE_H

#include "InputFiles.h"
#include "Symbols.h"
#include "lld/Common/Strings.h"
#include "llvm/ADT/CachedHashString.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/STLExtras.h"

namespace lld {
namespace elf {

// SymbolTable is a bucket of all known symbols, including defined,
// undefined, or lazy symbols (the last one is symbols in archive
// files whose archive members are not yet loaded).
//
// We put all symbols of all files to a SymbolTable, and the
// SymbolTable selects the "best" symbols if there are name
// conflicts. For example, obviously, a defined symbol is better than
// an undefined symbol. Or, if there's a conflict between a lazy and a
// undefined, it'll read an archive member to read a real definition
// to replace the lazy symbol. The logic is implemented in the
// add*() functions, which are called by input files as they are parsed. There
// is one add* function per symbol type.
class SymbolTable {
  struct FilterOutPlaceholder {
    bool operator()(Symbol *S) const { return !S->isPlaceholder(); }
  };
  using iterator = llvm::filter_iterator<std::vector<Symbol *>::const_iterator,
                                         FilterOutPlaceholder>;

public:
  llvm::iterator_range<iterator> symbols() const {
    return llvm::make_filter_range(symVector, FilterOutPlaceholder());
  }

void wrap(Symbol *sym, Symbol *real, Symbol *wrap);

Symbol *insert(StringRef name);

Symbol *addSymbol(const Symbol &newSym);

void scanVersionScript();

Symbol *find(StringRef name);

void handleDynamicList();

// Set of .so files to not link the same shared object file more than once.
  llvm::DenseMap<StringRef, SharedFile *> soNames;

// Comdat groups define "link once" sections. If two comdat groups have the
  // same name, only one of them is linked, and the other is ignored. This map
  // is used to uniquify them.
  llvm::DenseMap<llvm::CachedHashStringRef, const InputFile *> comdatGroups;

private:
  std::vector<Symbol *> findByVersion(SymbolVersion ver);
  std::vector<Symbol *> findAllByVersion(SymbolVersion ver);

llvm::StringMap<std::vector<Symbol *>> &getDemangledSyms();
  void assignExactVersion(SymbolVersion ver, uint16_t versionId,
                          StringRef versionName);
  void assignWildcardVersion(SymbolVersion ver, uint16_t versionId);

// The order the global symbols are in is not defined. We can use an arbitrary
  // order, but it has to be reproducible. That is true even when cross linking.
  // The default hashing of StringRef produces different results on 32 and 64
  // bit systems so we use a map to a vector. That is arbitrary, deterministic
  // but a bit inefficient.
  // FIXME: Experiment with passing in a custom hashing or sorting the symbols
  // once symbol resolution is finished.
  llvm::DenseMap<llvm::CachedHashStringRef, int> symMap;
  std::vector<Symbol *> symVector;

// A map from demangled symbol names to their symbol objects.
  // This mapping is 1:N because two symbols with different versions
  // can have the same name. We use this map to handle "extern C++ {}"
  // directive in version scripts.
  llvm::Optional<llvm::StringMap<std::vector<Symbol *>>> demangledSyms;
};

extern SymbolTable *symtab;

} // namespace elf
} // namespace lld

#endif

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