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 15 using namespace llvm; 16 17 MCObjectWriter::~MCObjectWriter() = default; 18 19 bool MCObjectWriter::isSymbolRefDifferenceFullyResolved( 20 const MCAssembler &Asm, const MCSymbolRefExpr *A, const MCSymbolRefExpr *B, 21 bool InSet) const { 22 // Modified symbol references cannot be resolved. 23 if (A->getKind() != MCSymbolRefExpr::VK_None || 24 B->getKind() != MCSymbolRefExpr::VK_None) 25 return false; 26 27 const MCSymbol &SA = A->getSymbol(); 28 const MCSymbol &SB = B->getSymbol(); 29 if (SA.isUndefined() || SB.isUndefined()) 30 return false; 31 32 if (!SA.getFragment() || !SB.getFragment()) 33 return false; 34 35 return isSymbolRefDifferenceFullyResolvedImpl(Asm, SA, SB, InSet); 36 } 37 38 bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl( 39 const MCAssembler &Asm, const MCSymbol &A, const MCSymbol &B, 40 bool InSet) const { 41 return isSymbolRefDifferenceFullyResolvedImpl(Asm, A, *B.getFragment(), InSet, 42 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