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annotate lib/MC/MCObjectWriter.cpp @ 33:e4204d083e25

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LLVM 3.5
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 14:32:10 +0900
parents 95c75e76d11b
children afa8332a0e37
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1 //===- lib/MC/MCObjectWriter.cpp - MCObjectWriter implementation ----------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #include "llvm/MC/MCAssembler.h"
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11 #include "llvm/MC/MCExpr.h"
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12 #include "llvm/MC/MCObjectWriter.h"
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13 #include "llvm/MC/MCSymbol.h"
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14
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15 using namespace llvm;
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16
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17 MCObjectWriter::~MCObjectWriter() {
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18 }
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19
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20 bool
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21 MCObjectWriter::IsSymbolRefDifferenceFullyResolved(const MCAssembler &Asm,
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22 const MCSymbolRefExpr *A,
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23 const MCSymbolRefExpr *B,
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24 bool InSet) const {
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25 // Modified symbol references cannot be resolved.
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26 if (A->getKind() != MCSymbolRefExpr::VK_None ||
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27 B->getKind() != MCSymbolRefExpr::VK_None)
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28 return false;
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29
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30 const MCSymbol &SA = A->getSymbol();
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31 const MCSymbol &SB = B->getSymbol();
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32 if (SA.AliasedSymbol().isUndefined() || SB.AliasedSymbol().isUndefined())
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33 return false;
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34
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35 const MCSymbolData &DataA = Asm.getSymbolData(SA);
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36 const MCSymbolData &DataB = Asm.getSymbolData(SB);
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37 if(!DataA.getFragment() || !DataB.getFragment())
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38 return false;
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39
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40 return IsSymbolRefDifferenceFullyResolvedImpl(Asm, DataA,
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41 *DataB.getFragment(),
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42 InSet,
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43 false);
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44 }
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45
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46 bool
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47 MCObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
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48 const MCSymbolData &DataA,
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49 const MCFragment &FB,
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50 bool InSet,
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51 bool IsPCRel) const {
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52 const MCSection &SecA = DataA.getSymbol().AliasedSymbol().getSection();
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53 const MCSection &SecB = FB.getParent()->getSection();
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54 // On ELF and COFF A - B is absolute if A and B are in the same section.
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55 return &SecA == &SecB;
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56 }