1 //===- Symbols.cpp --------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "Symbols.h" 10 #include "InputFiles.h" 11 #include "SyntheticSections.h" 12 13 using namespace llvm; 14 using namespace lld; 15 using namespace lld::macho; 16 17 // Returns a symbol for an error message. 18 static std::string demangle(StringRef symName) { 19 if (config->demangle) 20 return demangleItanium(symName); 21 return std::string(symName); 22 } 23 24 std::string lld::toString(const Symbol &sym) { return demangle(sym.getName()); } 25 26 std::string lld::toMachOString(const object::Archive::Symbol &b) { 27 return demangle(b.getName()); 28 } 29 30 uint64_t Symbol::getStubVA() const { return in.stubs->getVA(stubsIndex); } 31 uint64_t Symbol::getGotVA() const { return in.got->getVA(gotIndex); } 32 uint64_t Symbol::getTlvVA() const { return in.tlvPointers->getVA(gotIndex); } 33 34 uint64_t Defined::getVA() const { 35 if (isAbsolute()) 36 return value; 37 38 if (!isec->isFinal) { 39 // A target arch that does not use thunks ought never ask for 40 // the address of a function that has not yet been finalized. 41 assert(target->usesThunks()); 42 43 // MergedOutputSection::finalize() can seek the address of a 44 // function before its address is assigned. The thunking algorithm 45 // knows that unfinalized functions will be out of range, so it is 46 // expedient to return a contrived out-of-range address. 47 return TargetInfo::outOfRangeVA; 48 } 49 return isec->getVA() + value; 50 } 51 52 uint64_t Defined::getFileOffset() const { 53 if (isAbsolute()) { 54 error("absolute symbol " + toString(*this) + 55 " does not have a file offset"); 56 return 0; 57 } 58 return isec->getFileOffset() + value; 59 } 60 61 uint64_t DylibSymbol::getVA() const { 62 return isInStubs() ? getStubVA() : Symbol::getVA(); 63 } 64 65 void LazySymbol::fetchArchiveMember() { getFile()->fetch(sym); } 66