1 //===- lib/MC/MCObjectWriter.cpp - MCObjectWriter implementation ----------===// 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 "llvm/MC/MCObjectWriter.h" 10 #include "llvm/MC/MCAssembler.h" 11 #include "llvm/MC/MCExpr.h" 12 #include "llvm/MC/MCFragment.h" 13 #include "llvm/MC/MCSymbol.h" 14 namespace llvm { 15 class MCSection; 16 } 17 18 using namespace llvm; 19 20 MCObjectWriter::~MCObjectWriter() = default; 21 22 void MCObjectWriter::reset() { 23 FileNames.clear(); 24 AddrsigSyms.clear(); 25 EmitAddrsigSection = false; 26 SubsectionsViaSymbols = false; 27 CGProfile.clear(); 28 } 29 30 bool MCObjectWriter::isSymbolRefDifferenceFullyResolved( 31 const MCAssembler &Asm, const MCSymbolRefExpr *A, const MCSymbolRefExpr *B, 32 bool InSet) const { 33 // Modified symbol references cannot be resolved. 34 if (A->getKind() != MCSymbolRefExpr::VK_None || 35 B->getKind() != MCSymbolRefExpr::VK_None) 36 return false; 37 38 const MCSymbol &SA = A->getSymbol(); 39 const MCSymbol &SB = B->getSymbol(); 40 assert(!SA.isUndefined() && !SB.isUndefined()); 41 return isSymbolRefDifferenceFullyResolvedImpl(Asm, SA, *SB.getFragment(), 42 InSet, /*IsPCRel=*/false); 43 } 44 45 bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl( 46 const MCAssembler &Asm, const MCSymbol &SymA, const MCFragment &FB, 47 bool InSet, bool IsPCRel) const { 48 const MCSection &SecA = SymA.getSection(); 49 const MCSection &SecB = *FB.getParent(); 50 // On ELF and COFF A - B is absolute if A and B are in the same section. 51 return &SecA == &SecB; 52 } 53 54 void MCObjectWriter::addFileName(MCAssembler &Asm, StringRef FileName) { 55 FileNames.emplace_back(std::string(FileName), Asm.Symbols.size()); 56 } 57