forked from OSchip/llvm-project
86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
//===- Symbols.cpp --------------------------------------------------------===//
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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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#include "Symbols.h"
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#include "Error.h"
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#include "InputFiles.h"
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#include "Strings.h"
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#include "lld/Support/Memory.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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using namespace llvm::object;
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namespace lld {
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namespace coff {
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StringRef SymbolBody::getName() {
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// DefinedCOFF names are read lazily for a performance reason.
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// Non-external symbol names are never used by the linker except for logging
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// or debugging. Their internal references are resolved not by name but by
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// symbol index. And because they are not external, no one can refer them by
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// name. Object files contain lots of non-external symbols, and creating
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// StringRefs for them (which involves lots of strlen() on the string table)
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// is a waste of time.
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if (Name.empty()) {
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auto *D = cast<DefinedCOFF>(this);
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D->File->getCOFFObj()->getSymbolName(D->Sym, Name);
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}
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return Name;
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}
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InputFile *SymbolBody::getFile() {
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if (auto *Sym = dyn_cast<DefinedCOFF>(this))
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return Sym->File;
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if (auto *Sym = dyn_cast<DefinedBitcode>(this))
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return Sym->File;
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if (auto *Sym = dyn_cast<Lazy>(this))
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return Sym->File;
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return nullptr;
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}
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COFFSymbolRef DefinedCOFF::getCOFFSymbol() {
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size_t SymSize = File->getCOFFObj()->getSymbolTableEntrySize();
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if (SymSize == sizeof(coff_symbol16))
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return COFFSymbolRef(reinterpret_cast<const coff_symbol16 *>(Sym));
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assert(SymSize == sizeof(coff_symbol32));
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return COFFSymbolRef(reinterpret_cast<const coff_symbol32 *>(Sym));
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}
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DefinedImportThunk::DefinedImportThunk(StringRef Name, DefinedImportData *S,
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uint16_t Machine)
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: Defined(DefinedImportThunkKind, Name) {
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switch (Machine) {
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case AMD64: Data.reset(new ImportThunkChunkX64(S)); return;
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case I386: Data.reset(new ImportThunkChunkX86(S)); return;
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case ARMNT: Data.reset(new ImportThunkChunkARM(S)); return;
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default: llvm_unreachable("unknown machine type");
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}
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}
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Defined *Undefined::getWeakAlias() {
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// A weak alias may be a weak alias to another symbol, so check recursively.
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for (SymbolBody *A = WeakAlias; A; A = cast<Undefined>(A)->WeakAlias)
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if (auto *D = dyn_cast<Defined>(A))
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return D;
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return nullptr;
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}
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// Returns a symbol name for an error message.
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std::string toString(SymbolBody &B) {
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if (Optional<std::string> S = demangle(B.getName()))
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return ("\"" + *S + "\" (" + B.getName() + ")").str();
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return B.getName();
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}
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} // namespace coff
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} // namespace lld
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