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//===- SymbolTable.h --------------------------------------------*- C++ -*-===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLD_ELF_SYMBOL_TABLE_H
#define LLD_ELF_SYMBOL_TABLE_H
#include "InputFiles.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseMapInfo.h"
namespace lld {
namespace elf2 {
struct Symbol;
// 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 resolve().
class SymbolTable {
public:
SymbolTable();
void addFile(std::unique_ptr<InputFile> File);
const ELFFileBase *getFirstELF() const {
if (!ObjectFiles.empty())
return ObjectFiles[0].get();
if (!SharedFiles.empty())
return SharedFiles[0].get();
return nullptr;
}
const llvm::DenseMap<StringRef, Symbol *> &getSymbols() const {
return Symtab;
}
const std::vector<std::unique_ptr<ObjectFileBase>> &getObjectFiles() const {
return ObjectFiles;
}
const std::vector<std::unique_ptr<SharedFileBase>> &getSharedFiles() const {
return SharedFiles;
}
SymbolBody *getEntrySym() const {
if (!EntrySym)
return nullptr;
return EntrySym->getReplacement();
}
private:
Symbol *insert(SymbolBody *New);
template <class ELFT> void addELFFile(ELFFileBase *File);
void addELFFile(ELFFileBase *File);
void addLazy(Lazy *New);
void addMemberFile(Lazy *Body);
template <class ELFT> void init();
template <class ELFT> void resolve(SymbolBody *Body);
std::vector<std::unique_ptr<ArchiveFile>> ArchiveFiles;
llvm::DenseMap<StringRef, Symbol *> Symtab;
llvm::BumpPtrAllocator Alloc;
// The writer needs to infer the machine type from the object files.
std::vector<std::unique_ptr<ObjectFileBase>> ObjectFiles;
std::vector<std::unique_ptr<SharedFileBase>> SharedFiles;
SymbolBody *EntrySym = nullptr;
};
} // namespace elf2
} // namespace lld
#endif
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