blob: bb6d073dcf308bd8b6b6d481f80a54af468c411a [file] [log] [blame]
//===- Symbols.cpp --------------------------------------------------------===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "Symbols.h"
#include "InputFiles.h"
#include "SyntheticSections.h"
using namespace llvm;
using namespace lld;
using namespace lld::macho;
static_assert(sizeof(void *) != 8 || sizeof(Symbol) == 48,
"Try to minimize Symbol's size; we create many instances");
// The Microsoft ABI doesn't support using parent class tail padding for child
// members, hence the _MSC_VER check.
#if !defined(_MSC_VER)
static_assert(sizeof(void *) != 8 || sizeof(Defined) == 80,
"Try to minimize Defined's size; we create many instances");
static_assert(sizeof(SymbolUnion) == sizeof(Defined),
"Defined should be the largest Symbol kind");
// Returns a symbol for an error message.
static std::string demangle(StringRef symName) {
if (config->demangle)
return demangleItanium(symName);
return std::string(symName);
std::string lld::toString(const Symbol &sym) { return demangle(sym.getName()); }
std::string lld::toMachOString(const object::Archive::Symbol &b) {
return demangle(b.getName());
uint64_t Symbol::getStubVA() const { return in.stubs->getVA(stubsIndex); }
uint64_t Symbol::getGotVA() const { return>getVA(gotIndex); }
uint64_t Symbol::getTlvVA() const { return in.tlvPointers->getVA(gotIndex); }
Defined::Defined(StringRefZ name, InputFile *file, InputSection *isec,
uint64_t value, uint64_t size, bool isWeakDef, bool isExternal,
bool isPrivateExtern, bool isThumb,
bool isReferencedDynamically, bool noDeadStrip,
bool canOverrideWeakDef, bool isWeakDefCanBeHidden)
: Symbol(DefinedKind, name, file), overridesWeakDef(canOverrideWeakDef),
privateExtern(isPrivateExtern), includeInSymtab(true), thumb(isThumb),
referencedDynamically(isReferencedDynamically), noDeadStrip(noDeadStrip),
weakDefCanBeHidden(isWeakDefCanBeHidden), weakDef(isWeakDef),
external(isExternal), isec(isec), value(value), size(size) {
if (isec) {
// Maintain sorted order.
for (auto it = isec->symbols.rbegin(), rend = isec->symbols.rend();
it != rend; ++it) {
auto next = std::next(it);
if (next == rend)
if ((*it)->value < (*next)->value)
std::swap(*next, *it);
bool Defined::isTlv() const {
return !isAbsolute() && isThreadLocalVariables(isec->getFlags());
uint64_t Defined::getVA() const {
assert(isLive() && "this should only be called for live symbols");
if (isAbsolute())
return value;
if (!isec->isFinal) {
// A target arch that does not use thunks ought never ask for
// the address of a function that has not yet been finalized.
// ConcatOutputSection::finalize() can seek the address of a
// function before its address is assigned. The thunking algorithm
// knows that unfinalized functions will be out of range, so it is
// expedient to return a contrived out-of-range address.
return TargetInfo::outOfRangeVA;
return isec->getVA(value);
void Defined::canonicalize() {
if (unwindEntry)
unwindEntry = unwindEntry->canonical();
if (isec)
isec = isec->canonical();
uint64_t DylibSymbol::getVA() const {
return isInStubs() ? getStubVA() : Symbol::getVA();
void LazySymbol::fetchArchiveMember() { getFile()->fetch(sym); }