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//===- Symbols.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_SYMBOLS_H
#define LLD_WASM_SYMBOLS_H
#include "lld/Common/LLVM.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/Wasm.h"
using llvm::object::Archive;
using llvm::object::WasmSymbol;
using llvm::wasm::WasmImport;
using llvm::wasm::WasmExport;
namespace lld {
namespace wasm {
class InputFile;
class InputSegment;
class Symbol {
public:
enum Kind {
DefinedFunctionKind,
DefinedGlobalKind,
LazyKind,
UndefinedFunctionKind,
UndefinedGlobalKind,
LastDefinedKind = DefinedGlobalKind,
InvalidKind,
};
Symbol(StringRef Name, bool IsLocal)
: WrittenToSymtab(0), WrittenToNameSec(0), Name(Name), IsLocal(IsLocal) {}
Kind getKind() const { return SymbolKind; }
bool isLazy() const { return SymbolKind == LazyKind; }
bool isDefined() const { return SymbolKind <= LastDefinedKind; }
bool isUndefined() const {
return SymbolKind == UndefinedGlobalKind ||
SymbolKind == UndefinedFunctionKind;
}
bool isFunction() const {
return SymbolKind == DefinedFunctionKind ||
SymbolKind == UndefinedFunctionKind;
}
bool isGlobal() const { return !isFunction(); }
bool isLocal() const { return IsLocal; }
bool isWeak() const;
// Returns the symbol name.
StringRef getName() const { return Name; }
// Returns the file from which this symbol was created.
InputFile *getFile() const { return File; }
uint32_t getGlobalIndex() const;
uint32_t getFunctionIndex() const;
uint32_t getFunctionTypeIndex() const;
uint32_t getOutputIndex() const;
// Returns the virtual address of a defined global.
// Only works for globals, not functions.
uint32_t getVirtualAddress() const;
// Returns true if an output index has been set for this symbol
bool hasOutputIndex() { return OutputIndex.hasValue(); }
// Set the output index of the symbol (in the function or global index
// space of the output object.
void setOutputIndex(uint32_t Index);
void update(Kind K, InputFile *F = nullptr, const WasmSymbol *Sym = nullptr,
const InputSegment *Segment = nullptr);
void setArchiveSymbol(const Archive::Symbol &Sym) { ArchiveSymbol = Sym; }
const Archive::Symbol &getArchiveSymbol() { return ArchiveSymbol; }
// This bit is used by Writer::writeNameSection() to prevent
// symbols from being written to the symbol table more than once.
unsigned WrittenToSymtab : 1;
unsigned WrittenToNameSec : 1;
protected:
StringRef Name;
bool IsLocal;
Archive::Symbol ArchiveSymbol = {nullptr, 0, 0};
Kind SymbolKind = InvalidKind;
InputFile *File = nullptr;
const WasmSymbol *Sym = nullptr;
const InputSegment *Segment = nullptr;
llvm::Optional<uint32_t> OutputIndex;
};
} // namespace wasm
// Returns a symbol name for an error message.
std::string toString(wasm::Symbol &Sym);
std::string toString(wasm::Symbol::Kind &Kind);
} // namespace lld
#endif
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