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