forked from OSchip/llvm-project
78 lines
2.6 KiB
C++
78 lines
2.6 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_WASM_SYMBOL_TABLE_H
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#define LLD_WASM_SYMBOL_TABLE_H
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#include "InputFiles.h"
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#include "Symbols.h"
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#include "llvm/ADT/CachedHashString.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Support/raw_ostream.h"
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using llvm::wasm::WasmSignature;
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namespace lld {
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namespace wasm {
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class InputSegment;
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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 the
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// add*() functions, which are called by input files as they are parsed.
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// There is one add* function per symbol type.
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class SymbolTable {
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public:
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void addFile(InputFile *File);
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std::vector<ObjFile *> ObjectFiles;
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void reportDuplicate(Symbol *Existing, InputFile *NewFile);
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void reportRemainingUndefines();
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ArrayRef<Symbol *> getSymbols() const { return SymVector; }
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Symbol *find(StringRef Name);
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ObjFile *findComdat(StringRef Name) const;
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Symbol *addDefined(StringRef Name, Symbol::Kind Kind, uint32_t Flags,
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InputFile *F, const InputSegment *Segment = nullptr,
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InputFunction *Function = nullptr, uint32_t Address = 0);
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Symbol *addUndefined(StringRef Name, Symbol::Kind Kind, uint32_t Flags,
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InputFile *F, const WasmSignature *Signature = nullptr);
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Symbol *addUndefinedFunction(StringRef Name, const WasmSignature *Type);
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Symbol *addDefinedGlobal(StringRef Name);
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Symbol *addDefinedFunction(StringRef Name, const WasmSignature *Type,
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uint32_t Flags);
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void addLazy(ArchiveFile *F, const Archive::Symbol *Sym);
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bool addComdat(StringRef Name, ObjFile *);
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private:
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std::pair<Symbol *, bool> insert(StringRef Name);
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llvm::DenseMap<llvm::CachedHashStringRef, ObjFile *> ComdatMap;
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llvm::DenseMap<llvm::CachedHashStringRef, Symbol *> SymMap;
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std::vector<Symbol *> SymVector;
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};
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extern SymbolTable *Symtab;
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} // namespace wasm
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} // namespace lld
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#endif
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