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      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