forked from OSchip/llvm-project
126 lines
3.9 KiB
C++
126 lines
3.9 KiB
C++
//===- SymbolTable.h --------------------------------------------*- C++ -*-===//
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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 "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/DenseMapInfo.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/raw_ostream.h"
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#ifdef _MSC_VER
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// <future> depends on <eh.h> for __uncaught_exception.
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#include <eh.h>
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#endif
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#include <future>
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namespace llvm {
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struct LTOCodeGenerator;
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}
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namespace lld {
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namespace coff {
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class Chunk;
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class Defined;
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class Lazy;
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class SymbolBody;
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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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void addFile(std::unique_ptr<InputFile> File);
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std::vector<std::unique_ptr<InputFile>> &getFiles() { return Files; }
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void step();
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void run();
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bool queueEmpty();
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// Print an error message on undefined symbols. If Resolve is true, try to
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// resolve any undefined symbols and update the symbol table accordingly.
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void reportRemainingUndefines(bool Resolve);
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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. Returns a nullptr if not found.
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Symbol *find(StringRef Name);
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Symbol *findUnderscore(StringRef Name);
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// Occasionally we have to resolve an undefined symbol to its
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// mangled symbol. This function tries to find a mangled name
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// for U from the symbol table, and if found, set the symbol as
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// a weak alias for U.
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void mangleMaybe(Undefined *U);
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StringRef findMangle(StringRef Name);
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// Print a layout map to OS.
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void printMap(llvm::raw_ostream &OS);
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// Build a set of COFF objects representing the combined contents of
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// BitcodeFiles and add them to the symbol table. Called after all files are
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// added and before the writer writes results to a file.
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void addCombinedLTOObjects();
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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<ImportFile *> ImportFiles;
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// The writer needs to infer the machine type from the object files.
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std::vector<ObjectFile *> ObjectFiles;
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// Creates an Undefined symbol for a given name.
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Undefined *addUndefined(StringRef Name);
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DefinedRelative *addRelative(StringRef Name, uint64_t VA);
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DefinedAbsolute *addAbsolute(StringRef Name, uint64_t VA);
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// A list of chunks which to be added to .rdata.
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std::vector<Chunk *> LocalImportChunks;
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private:
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void readArchives();
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void readObjects();
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void addSymbol(SymbolBody *New);
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void addLazy(Lazy *New, std::vector<Symbol *> *Accum);
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Symbol *insert(SymbolBody *New);
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StringRef findByPrefix(StringRef Prefix);
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void addMemberFile(Lazy *Body);
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void addCombinedLTOObject(ObjectFile *Obj);
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std::vector<ObjectFile *> createLTOObjects(llvm::LTOCodeGenerator *CG);
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llvm::DenseMap<StringRef, Symbol *> Symtab;
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std::vector<std::unique_ptr<InputFile>> Files;
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std::vector<std::future<ArchiveFile *>> ArchiveQueue;
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std::vector<std::future<InputFile *>> ObjectQueue;
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std::vector<BitcodeFile *> BitcodeFiles;
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std::vector<SmallString<0>> Objs;
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llvm::BumpPtrAllocator Alloc;
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};
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} // namespace coff
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} // namespace lld
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#endif
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