9c0716f116
This ports r366573 from COFF to ELF. There are now to toString(Archive::Symbol), one doing MSVC demangling in COFF and one doing Itanium demangling in ELF, so rename these two to toCOFFString() and to toELFString() to not get a duplicate symbol. Nothing ever passes a raw Archive::Symbol to CHECK(), so these not being part of the normal toString() machinery seems ok. There are two code paths in the ELF linker that emits this type of diagnostic: 1. The "normal" one in InputFiles.cpp. This is covered by the tweaked test. 2. An additional one that's only used for libcalls if there's at least one bitcode in the link, and if the libcall symbol is lazy, and lazily loaded from an archive (i.e. not from a lazy .o file). (This code path was added in r339301.) Since all libcall names so far are C symbols and never mangled, the change there is not observable and hence not covered by tests. Differential Revision: https://reviews.llvm.org/D65095 llvm-svn: 366836
123 lines
4.0 KiB
C++
123 lines
4.0 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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namespace lld {
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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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static std::string demangle(StringRef symName) {
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if (config->demangle)
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if (Optional<std::string> s = demangleMSVC(symName))
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return *s;
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return symName;
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}
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std::string toString(coff::Symbol &b) { return demangle(b.getName()); }
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std::string toCOFFString(const Archive::Symbol &b) {
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return demangle(b.getName());
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}
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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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