forked from OSchip/llvm-project
77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
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//===- 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_COFF_SYMBOL_TABLE_H
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#define LLD_COFF_SYMBOL_TABLE_H
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#include "InputFiles.h"
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#include "Memory.h"
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#include "llvm/Support/Allocator.h"
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#include <unordered_map>
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namespace lld {
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namespace coff {
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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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std::error_code addFile(std::unique_ptr<InputFile> File);
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// Print an error message on undefined symbols.
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bool reportRemainingUndefines();
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// Returns a list of chunks of selected symbols.
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std::vector<Chunk *> getChunks();
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// Returns a symbol for a given name. It's not guaranteed that the
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// returned symbol actually has the same name (because of various
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// mechanisms to allow aliases, a name can be resolved to a
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// different symbol). Returns a nullptr if not found.
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SymbolBody *find(StringRef Name);
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// Dump contents of the symbol table to stderr.
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void dump();
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// The writer needs to handle DLL import libraries specially in
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// order to create the import descriptor table.
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std::vector<std::unique_ptr<ImportFile>> ImportFiles;
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private:
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std::error_code addObject(ObjectFile *File);
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std::error_code addArchive(ArchiveFile *File);
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std::error_code addImport(ImportFile *File);
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std::error_code resolve(SymbolBody *Body);
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std::error_code addMemberFile(Lazy *Body);
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void addInitialSymbol(SymbolBody *Body);
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std::unordered_map<StringRef, Symbol *> Symtab;
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std::vector<std::unique_ptr<ObjectFile>> ObjectFiles;
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std::vector<std::unique_ptr<ArchiveFile>> ArchiveFiles;
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std::vector<std::unique_ptr<SymbolBody>> OwnedSymbols;
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llvm::BumpPtrAllocator Alloc;
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StringAllocator StringAlloc;
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};
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} // namespace pecoff
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} // namespace lld
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#endif
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