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annotate lib/MC/MCAsmInfo.cpp @ 33:e4204d083e25 LLVM3.5

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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 54457678186b
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1 //===-- MCAsmInfo.cpp - Asm Info -------------------------------------------==//
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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 // This file defines target asm properties related what form asm statements
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11 // should take.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/MC/MCAsmInfo.h"
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16 #include "llvm/MC/MCContext.h"
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17 #include "llvm/MC/MCExpr.h"
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18 #include "llvm/MC/MCStreamer.h"
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19 #include "llvm/Support/DataTypes.h"
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20 #include "llvm/Support/Dwarf.h"
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21 #include <cctype>
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22 #include <cstring>
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23 using namespace llvm;
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24
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25 MCAsmInfo::MCAsmInfo() {
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26 PointerSize = 4;
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27 CalleeSaveStackSlotSize = 4;
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28
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29 IsLittleEndian = true;
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30 StackGrowsUp = false;
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31 HasSubsectionsViaSymbols = false;
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32 HasMachoZeroFillDirective = false;
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33 HasMachoTBSSDirective = false;
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34 HasStaticCtorDtorReferenceInStaticMode = false;
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35 LinkerRequiresNonEmptyDwarfLines = false;
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36 MaxInstLength = 4;
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37 MinInstAlignment = 1;
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38 DollarIsPC = false;
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39 SeparatorString = ";";
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40 CommentColumn = 40;
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41 CommentString = "#";
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42 LabelSuffix = ":";
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43 DebugLabelSuffix = ":";
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44 GlobalPrefix = '\0';
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45 PrivateGlobalPrefix = "L";
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46 LinkerPrivateGlobalPrefix = "";
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47 InlineAsmStart = "APP";
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48 InlineAsmEnd = "NO_APP";
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49 Code16Directive = ".code16";
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50 Code32Directive = ".code32";
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51 Code64Directive = ".code64";
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52 AssemblerDialect = 0;
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53 AllowAtInName = false;
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54 UseDataRegionDirectives = false;
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55 ZeroDirective = "\t.zero\t";
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56 AsciiDirective = "\t.ascii\t";
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57 AscizDirective = "\t.asciz\t";
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58 Data8bitsDirective = "\t.byte\t";
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59 Data16bitsDirective = "\t.short\t";
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60 Data32bitsDirective = "\t.long\t";
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61 Data64bitsDirective = "\t.quad\t";
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62 SunStyleELFSectionSwitchSyntax = false;
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63 UsesELFSectionDirectiveForBSS = false;
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64 AlignDirective = "\t.align\t";
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65 AlignmentIsInBytes = true;
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66 TextAlignFillValue = 0;
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67 GPRel64Directive = 0;
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68 GPRel32Directive = 0;
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69 GlobalDirective = "\t.globl\t";
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70 HasSetDirective = true;
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71 HasAggressiveSymbolFolding = true;
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72 COMMDirectiveAlignmentIsInBytes = true;
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73 LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;
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74 HasDotTypeDotSizeDirective = true;
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75 HasSingleParameterDotFile = true;
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76 HasIdentDirective = false;
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77 HasNoDeadStrip = false;
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78 WeakRefDirective = 0;
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79 HasWeakDefDirective = false;
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80 HasWeakDefCanBeHiddenDirective = false;
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81 HasLinkOnceDirective = false;
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82 HiddenVisibilityAttr = MCSA_Hidden;
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83 HiddenDeclarationVisibilityAttr = MCSA_Hidden;
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84 ProtectedVisibilityAttr = MCSA_Protected;
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85 HasLEB128 = false;
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86 SupportsDebugInformation = false;
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87 ExceptionsType = ExceptionHandling::None;
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88 DwarfUsesRelocationsAcrossSections = true;
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89 DwarfRegNumForCFI = false;
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90 HasMicrosoftFastStdCallMangling = false;
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91 NeedsDwarfSectionOffsetDirective = false;
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92 UseParensForSymbolVariant = false;
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93 }
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94
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95 MCAsmInfo::~MCAsmInfo() {
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96 }
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97
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98
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99 unsigned MCAsmInfo::getULEB128Size(uint64_t Value) {
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100 unsigned Size = 0;
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101 do {
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102 Value >>= 7;
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103 Size += sizeof(int8_t);
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104 } while (Value);
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105 return Size;
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106 }
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107
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108 unsigned MCAsmInfo::getSLEB128Size(int64_t Value) {
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109 unsigned Size = 0;
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110 int Sign = Value >> (8 * sizeof(Value) - 1);
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111 bool IsMore;
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112
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113 do {
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114 unsigned Byte = Value & 0x7f;
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115 Value >>= 7;
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116 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
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117 Size += sizeof(int8_t);
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118 } while (IsMore);
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119 return Size;
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120 }
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121
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122 const MCExpr *
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123 MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
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124 unsigned Encoding,
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125 MCStreamer &Streamer) const {
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126 return getExprForFDESymbol(Sym, Encoding, Streamer);
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127 }
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128
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129 const MCExpr *
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130 MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,
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131 unsigned Encoding,
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132 MCStreamer &Streamer) const {
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133 if (!(Encoding & dwarf::DW_EH_PE_pcrel))
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134 return MCSymbolRefExpr::Create(Sym, Streamer.getContext());
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135
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136 MCContext &Context = Streamer.getContext();
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137 const MCExpr *Res = MCSymbolRefExpr::Create(Sym, Context);
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138 MCSymbol *PCSym = Context.CreateTempSymbol();
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139 Streamer.EmitLabel(PCSym);
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140 const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context);
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141 return MCBinaryExpr::CreateSub(Res, PC, Context);
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142 }