src/llvm/lib/MC/MCObjectWriter.cpp

   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
  21 MCObjectWriter::IsSymbolRefDifferenceFullyResolved(const MCAssembler &Asm,
  22                                                    const MCSymbolRefExpr *A,
  23                                                    const MCSymbolRefExpr *B,
  24                                                    bool InSet) const {
  25   // Modified symbol references cannot be resolved.
  26   if (A->getKind() != MCSymbolRefExpr::VK_None ||
  27       B->getKind() != MCSymbolRefExpr::VK_None)
  28     return false;
  29
  30   const MCSymbol &SA = A->getSymbol();
  31   const MCSymbol &SB = B->getSymbol();
  32   if (SA.AliasedSymbol().isUndefined() || SB.AliasedSymbol().isUndefined())
  33     return false;
  34
  35   const MCSymbolData &DataA = Asm.getSymbolData(SA);
  36   const MCSymbolData &DataB = Asm.getSymbolData(SB);
  37   if(!DataA.getFragment() || !DataB.getFragment())
  38     return false;
  39
  40   return IsSymbolRefDifferenceFullyResolvedImpl(Asm, DataA,
  41                                                 *DataB.getFragment(),
  42                                                 InSet,
  43                                                 false);
  44 }
  45
  46 bool
  47 MCObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
  48                                                       const MCSymbolData &DataA,
  49                                                       const MCFragment &FB,
  50                                                       bool InSet,
  51                                                       bool IsPCRel) const {
  52   const MCSection &SecA = DataA.getSymbol().AliasedSymbol().getSection();
  53   const MCSection &SecB = FB.getParent()->getSection();
  54   // On ELF and COFF  A - B is absolute if A and B are in the same section.
  55   return &SecA == &SecB;
  56 }