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136d27ab4d
This patch does the same thing as r365595 to other subdirectories, which completes the naming style change for the entire lld directory. With this, the naming style conversion is complete for lld. Differential Revision: https://reviews.llvm.org/D64473 llvm-svn: 365730
118 lines
3.8 KiB
C++
118 lines
3.8 KiB
C++
//===- Symbols.cpp --------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "Symbols.h"
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#include "InputFiles.h"
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#include "lld/Common/ErrorHandler.h"
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#include "lld/Common/Memory.h"
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#include "lld/Common/Strings.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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using namespace lld::coff;
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static_assert(sizeof(SymbolUnion) <= 48,
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"symbols should be optimized for memory usage");
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// Returns a symbol name for an error message.
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std::string lld::toString(coff::Symbol &b) {
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if (config->demangle)
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if (Optional<std::string> s = lld::demangleMSVC(b.getName()))
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return *s;
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return b.getName();
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}
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namespace lld {
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namespace coff {
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StringRef Symbol::getName() {
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// COFF symbol 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 (nameData == nullptr) {
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auto *d = cast<DefinedCOFF>(this);
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StringRef nameStr;
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cast<ObjFile>(d->file)->getCOFFObj()->getSymbolName(d->sym, nameStr);
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nameData = nameStr.data();
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nameSize = nameStr.size();
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assert(nameSize == nameStr.size() && "name length truncated");
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}
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return StringRef(nameData, nameSize);
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}
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InputFile *Symbol::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<Lazy>(this))
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return sym->file;
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return nullptr;
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}
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bool Symbol::isLive() const {
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if (auto *r = dyn_cast<DefinedRegular>(this))
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return r->getChunk()->live;
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if (auto *imp = dyn_cast<DefinedImportData>(this))
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return imp->file->live;
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if (auto *imp = dyn_cast<DefinedImportThunk>(this))
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return imp->wrappedSym->file->thunkLive;
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// Assume any other kind of symbol is live.
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return true;
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}
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// MinGW specific.
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void Symbol::replaceKeepingName(Symbol *other, size_t size) {
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StringRef origName = getName();
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memcpy(this, other, size);
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nameData = origName.data();
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nameSize = origName.size();
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}
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COFFSymbolRef DefinedCOFF::getCOFFSymbol() {
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size_t symSize = cast<ObjFile>(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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uint16_t DefinedAbsolute::numOutputSections;
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static Chunk *makeImportThunk(DefinedImportData *s, uint16_t machine) {
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if (machine == AMD64)
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return make<ImportThunkChunkX64>(s);
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if (machine == I386)
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return make<ImportThunkChunkX86>(s);
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if (machine == ARM64)
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return make<ImportThunkChunkARM64>(s);
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assert(machine == ARMNT);
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return make<ImportThunkChunkARM>(s);
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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), wrappedSym(s),
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data(makeImportThunk(s, machine)) {}
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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 (Symbol *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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} // namespace coff
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} // namespace lld
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