//===- lib/MC/MCObjectWriter.cpp - MCObjectWriter implementation ----------===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

#include "llvm/MC/MCAssembler.h"

#include "llvm/MC/MCExpr.h"

#include "llvm/MC/MCObjectWriter.h"

#include "llvm/MC/MCSymbol.h"

using namespace llvm_ks;

MCObjectWriter::~MCObjectWriter() {

}

bool MCObjectWriter::isSymbolRefDifferenceFullyResolved(

    const MCAssembler &Asm, const MCSymbolRefExpr *A, const MCSymbolRefExpr *B,

    bool InSet, bool &valid) const

{

  valid = true;

  // Modified symbol references cannot be resolved.

  if (A->getKind() != MCSymbolRefExpr::VK_None ||

      B->getKind() != MCSymbolRefExpr::VK_None)

    return false;

  const MCSymbol &SA = A->getSymbol();

  const MCSymbol &SB = B->getSymbol();

  if (SA.isUndefined() || SB.isUndefined())

    return false;

  if (!SA.getFragment() || !SB.getFragment())

    return false;

  if (!SA.isInSection()) {

      valid = false;

      return false;

  }

  return isSymbolRefDifferenceFullyResolvedImpl(Asm, SA, SB, InSet);

}

bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(

    const MCAssembler &Asm, const MCSymbol &A, const MCSymbol &B,

    bool InSet) const {

  return isSymbolRefDifferenceFullyResolvedImpl(Asm, A, *B.getFragment(), InSet,

                                                false);

}

bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(

    const MCAssembler &Asm, const MCSymbol &SymA, const MCFragment &FB,

    bool InSet, bool IsPCRel) const {

  const MCSection &SecA = SymA.getSection();

  const MCSection &SecB = *FB.getParent();

  // On ELF and COFF  A - B is absolute if A and B are in the same section.

  return &SecA == &SecB;

}

bool MCObjectWriter::isWeak(const MCSymbol &) const { return false; }