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annotate lib/MC/MCSectionCOFF.cpp @ 77:54457678186b

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents e4204d083e25
children 60c9769439b8
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1 //===- lib/MC/MCSectionCOFF.cpp - COFF Code Section Representation --------===//
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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/MCSectionCOFF.h"
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11 #include "llvm/MC/MCAsmInfo.h"
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12 #include "llvm/MC/MCContext.h"
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13 #include "llvm/MC/MCSymbol.h"
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14 #include "llvm/Support/raw_ostream.h"
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15 using namespace llvm;
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16
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17 MCSectionCOFF::~MCSectionCOFF() {} // anchor.
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18
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19 // ShouldOmitSectionDirective - Decides whether a '.section' directive
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20 // should be printed before the section name
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21 bool MCSectionCOFF::ShouldOmitSectionDirective(StringRef Name,
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22 const MCAsmInfo &MAI) const {
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23 if (COMDATSymbol)
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24 return false;
0
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25
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26 // FIXME: Does .section .bss/.data/.text work everywhere??
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27 if (Name == ".text" || Name == ".data" || Name == ".bss")
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28 return true;
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29
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30 return false;
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31 }
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32
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33 void MCSectionCOFF::setSelection(int Selection) const {
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34 assert(Selection != 0 && "invalid COMDAT selection type");
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35 this->Selection = Selection;
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36 Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
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37 }
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38
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39 void MCSectionCOFF::PrintSwitchToSection(const MCAsmInfo &MAI,
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40 raw_ostream &OS,
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41 const MCExpr *Subsection) const {
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42
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43 // standard sections don't require the '.section'
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44 if (ShouldOmitSectionDirective(SectionName, MAI)) {
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45 OS << '\t' << getSectionName() << '\n';
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46 return;
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47 }
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48
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49 OS << "\t.section\t" << getSectionName() << ",\"";
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50 if (getKind().isText())
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51 OS << 'x';
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52 else if (getKind().isBSS())
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53 OS << 'b';
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54 if (getKind().isWriteable())
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55 OS << 'w';
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56 else
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57 OS << 'r';
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58 if (getCharacteristics() & COFF::IMAGE_SCN_MEM_DISCARDABLE)
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59 OS << 'n';
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60 if (getCharacteristics() & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
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61 OS << 'd';
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62 OS << '"';
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63
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64 if (getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
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65 OS << ",";
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66 switch (Selection) {
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67 case COFF::IMAGE_COMDAT_SELECT_NODUPLICATES:
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68 OS << "one_only,";
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69 break;
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70 case COFF::IMAGE_COMDAT_SELECT_ANY:
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71 OS << "discard,";
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72 break;
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73 case COFF::IMAGE_COMDAT_SELECT_SAME_SIZE:
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74 OS << "same_size,";
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75 break;
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76 case COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH:
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77 OS << "same_contents,";
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78 break;
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79 case COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE:
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80 OS << "associative,";
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81 break;
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82 case COFF::IMAGE_COMDAT_SELECT_LARGEST:
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83 OS << "largest,";
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84 break;
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85 case COFF::IMAGE_COMDAT_SELECT_NEWEST:
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86 OS << "newest,";
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87 break;
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88 default:
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89 assert (0 && "unsupported COFF selection type");
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90 break;
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91 }
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92 assert(COMDATSymbol);
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93 OS << *COMDATSymbol;
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94 }
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95 OS << '\n';
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96 }
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97
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98 bool MCSectionCOFF::UseCodeAlign() const {
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99 return getKind().isText();
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100 }
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101
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102 bool MCSectionCOFF::isVirtualSection() const {
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103 return getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
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104 }