forked from OSchip/llvm-project
81 lines
2.7 KiB
C++
81 lines
2.7 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 "SyntheticSections.h"
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using namespace llvm;
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using namespace lld;
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using namespace lld::macho;
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// Returns a symbol 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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return demangleItanium(symName);
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return std::string(symName);
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}
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std::string lld::toString(const Symbol &sym) { return demangle(sym.getName()); }
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std::string lld::toMachOString(const object::Archive::Symbol &b) {
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return demangle(b.getName());
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}
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uint64_t Symbol::getStubVA() const { return in.stubs->getVA(stubsIndex); }
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uint64_t Symbol::getGotVA() const { return in.got->getVA(gotIndex); }
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uint64_t Symbol::getTlvVA() const { return in.tlvPointers->getVA(gotIndex); }
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bool Symbol::isLive() const {
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if (isa<DylibSymbol>(this) || isa<Undefined>(this))
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return used;
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if (auto *d = dyn_cast<Defined>(this)) {
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// Non-absolute symbols might be alive because their section is
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// no_dead_strip or live_support. In that case, the section will know
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// that it's live but `used` might be false. Non-absolute symbols always
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// have to use the section's `live` bit as source of truth.
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if (d->isAbsolute())
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return used;
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return d->isec->canonical()->isLive(d->value);
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}
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assert(!isa<CommonSymbol>(this) &&
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"replaceCommonSymbols() runs before dead code stripping, and isLive() "
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"should only be called after dead code stripping");
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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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uint64_t Defined::getVA() const {
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assert(isLive() && "this should only be called for live symbols");
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if (isAbsolute())
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return value;
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if (!isec->canonical()->isFinal) {
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// A target arch that does not use thunks ought never ask for
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// the address of a function that has not yet been finalized.
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assert(target->usesThunks());
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// ConcatOutputSection::finalize() can seek the address of a
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// function before its address is assigned. The thunking algorithm
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// knows that unfinalized functions will be out of range, so it is
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// expedient to return a contrived out-of-range address.
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return TargetInfo::outOfRangeVA;
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}
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return isec->canonical()->getVA(value);
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}
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uint64_t DylibSymbol::getVA() const {
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return isInStubs() ? getStubVA() : Symbol::getVA();
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}
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void LazySymbol::fetchArchiveMember() { getFile()->fetch(sym); }
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