forked from OSchip/llvm-project
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
//===- SymbolTable.h ------------------------------------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLD_ELF_SYMBOL_TABLE_H
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#define LLD_ELF_SYMBOL_TABLE_H
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#include "InputFiles.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/DenseMapInfo.h"
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namespace lld {
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namespace elf2 {
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class Defined;
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struct Symbol;
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// SymbolTable is a bucket of all known symbols, including defined,
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// undefined, or lazy symbols (the last one is symbols in archive
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// files whose archive members are not yet loaded).
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//
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// We put all symbols of all files to a SymbolTable, and the
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// SymbolTable selects the "best" symbols if there are name
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// conflicts. For example, obviously, a defined symbol is better than
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// an undefined symbol. Or, if there's a conflict between a lazy and a
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// undefined, it'll read an archive member to read a real definition
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// to replace the lazy symbol. The logic is implemented in resolve().
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class SymbolTable {
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public:
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SymbolTable();
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void addFile(std::unique_ptr<InputFile> File);
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// Print an error message on undefined symbols.
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void reportRemainingUndefines();
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// The writer needs to infer the machine type from the object files.
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std::vector<std::unique_ptr<ObjectFileBase>> ObjectFiles;
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private:
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void addObject(ObjectFileBase *File);
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void resolve(SymbolBody *Body);
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llvm::DenseMap<StringRef, Symbol *> Symtab;
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llvm::BumpPtrAllocator Alloc;
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};
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} // namespace elf2
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} // namespace lld
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#endif
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