72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
//===- 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
|