1 //===- lib/MC/MCObjectWriter.cpp - MCObjectWriter implementation ----------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/MC/MCAssembler.h" 11 #include "llvm/MC/MCExpr.h" 12 #include "llvm/MC/MCObjectWriter.h" 13 #include "llvm/MC/MCSymbol.h" 14 15 using namespace llvm; 16 17 MCObjectWriter::~MCObjectWriter() { 18 } 19 20 bool MCObjectWriter::isSymbolRefDifferenceFullyResolved( 21 const MCAssembler &Asm, const MCSymbolRefExpr *A, const MCSymbolRefExpr *B, 22 bool InSet) const { 23 // Modified symbol references cannot be resolved. 24 if (A->getKind() != MCSymbolRefExpr::VK_None || 25 B->getKind() != MCSymbolRefExpr::VK_None) 26 return false; 27 28 const MCSymbol &SA = A->getSymbol(); 29 const MCSymbol &SB = B->getSymbol(); 30 if (SA.isUndefined() || SB.isUndefined()) 31 return false; 32 33 if (!SA.getFragment() || !SB.getFragment()) 34 return false; 35 36 return isSymbolRefDifferenceFullyResolvedImpl(Asm, SA, SB, InSet); 37 } 38 39 bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl( 40 const MCAssembler &Asm, const MCSymbol &A, const MCSymbol &B, 41 bool InSet) const { 42 return isSymbolRefDifferenceFullyResolvedImpl(Asm, A, *B.getFragment(), InSet, 43 false); 44 } 45 46 bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl( 47 const MCAssembler &Asm, const MCSymbol &SymA, const MCFragment &FB, 48 bool InSet, bool IsPCRel) const { 49 const MCSection &SecA = SymA.getSection(); 50 const MCSection &SecB = *FB.getParent(); 51 // On ELF and COFF A - B is absolute if A and B are in the same section. 52 return &SecA == &SecB; 53 } 54 55 bool MCObjectWriter::isWeak(const MCSymbol &) const { return false; } 56
