| //===- 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_WASM_SYMBOL_TABLE_H |
| #define LLD_WASM_SYMBOL_TABLE_H |
| |
| #include "InputFiles.h" |
| #include "Symbols.h" |
| |
| #include "llvm/ADT/CachedHashString.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/Support/raw_ostream.h" |
| |
| using llvm::object::WasmSymbol; |
| using llvm::wasm::WasmSignature; |
| |
| namespace lld { |
| namespace wasm { |
| |
| class InputSegment; |
| |
| // 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 the |
| // add*() functions, which are called by input files as they are parsed. |
| // There is one add* function per symbol type. |
| class SymbolTable { |
| public: |
| void addFile(InputFile *File); |
| |
| std::vector<ObjFile *> ObjectFiles; |
| |
| void reportDuplicate(Symbol *Existing, InputFile *NewFile); |
| void reportRemainingUndefines(); |
| |
| ArrayRef<Symbol *> getSymbols() const { return SymVector; } |
| Symbol *find(StringRef Name); |
| |
| Symbol *addDefined(InputFile *F, const WasmSymbol *Sym, |
| const InputSegment *Segment = nullptr); |
| Symbol *addUndefined(InputFile *F, const WasmSymbol *Sym); |
| Symbol *addUndefinedFunction(StringRef Name, const WasmSignature *Type); |
| Symbol *addDefinedGlobal(StringRef Name); |
| void addLazy(ArchiveFile *F, const Archive::Symbol *Sym); |
| |
| private: |
| std::pair<Symbol *, bool> insert(StringRef Name); |
| |
| llvm::DenseMap<llvm::CachedHashStringRef, Symbol *> SymMap; |
| std::vector<Symbol *> SymVector; |
| }; |
| |
| extern SymbolTable *Symtab; |
| |
| } // namespace wasm |
| } // namespace lld |
| |
| #endif |