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annotate lib/CodeGen/AsmPrinter/DwarfCFIException.cpp @ 89:9020ffd06b8b

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Create prototype declaration automatically (only support direct continuation)
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 14 Apr 2015 03:55:39 +0900
parents 60c9769439b8
children afa8332a0e37
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //===-- CodeGen/AsmPrinter/DwarfException.cpp - Dwarf Exception Impl ------===//
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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 contains support for writing DWARF exception info into asm files.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "DwarfException.h"
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15 #include "llvm/ADT/SmallString.h"
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16 #include "llvm/ADT/StringExtras.h"
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17 #include "llvm/ADT/Twine.h"
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18 #include "llvm/CodeGen/AsmPrinter.h"
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19 #include "llvm/CodeGen/MachineFrameInfo.h"
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20 #include "llvm/CodeGen/MachineFunction.h"
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21 #include "llvm/CodeGen/MachineModuleInfo.h"
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22 #include "llvm/IR/DataLayout.h"
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23 #include "llvm/IR/Mangler.h"
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24 #include "llvm/IR/Module.h"
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25 #include "llvm/MC/MCAsmInfo.h"
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26 #include "llvm/MC/MCContext.h"
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27 #include "llvm/MC/MCExpr.h"
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28 #include "llvm/MC/MCSection.h"
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29 #include "llvm/MC/MCStreamer.h"
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30 #include "llvm/MC/MCSymbol.h"
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31 #include "llvm/MC/MachineLocation.h"
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32 #include "llvm/Support/Dwarf.h"
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33 #include "llvm/Support/ErrorHandling.h"
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34 #include "llvm/Support/FormattedStream.h"
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35 #include "llvm/Target/TargetFrameLowering.h"
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36 #include "llvm/Target/TargetLoweringObjectFile.h"
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37 #include "llvm/Target/TargetMachine.h"
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38 #include "llvm/Target/TargetOptions.h"
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39 #include "llvm/Target/TargetRegisterInfo.h"
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40 using namespace llvm;
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41
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42 DwarfCFIException::DwarfCFIException(AsmPrinter *A)
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43 : EHStreamer(A), shouldEmitPersonality(false), shouldEmitLSDA(false),
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44 shouldEmitMoves(false), moveTypeModule(AsmPrinter::CFI_M_None) {}
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45
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46 DwarfCFIException::~DwarfCFIException() {}
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47
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48 /// endModule - Emit all exception information that should come after the
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49 /// content.
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50 void DwarfCFIException::endModule() {
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51 if (moveTypeModule == AsmPrinter::CFI_M_Debug)
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52 Asm->OutStreamer.EmitCFISections(false, true);
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53
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54 // SjLj uses this pass and it doesn't need this info.
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55 if (!Asm->MAI->usesCFIForEH())
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56 return;
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57
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58 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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59
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60 unsigned PerEncoding = TLOF.getPersonalityEncoding();
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61
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62 if ((PerEncoding & 0x80) != dwarf::DW_EH_PE_indirect)
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63 return;
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64
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65 // Emit references to all used personality functions
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66 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
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67 for (size_t i = 0, e = Personalities.size(); i != e; ++i) {
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68 if (!Personalities[i])
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69 continue;
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70 MCSymbol *Sym = Asm->getSymbol(Personalities[i]);
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71 TLOF.emitPersonalityValue(Asm->OutStreamer, Asm->TM, Sym);
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72 }
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73 }
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74
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75 /// beginFunction - Gather pre-function exception information. Assumes it's
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76 /// being emitted immediately after the function entry point.
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77 void DwarfCFIException::beginFunction(const MachineFunction *MF) {
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78 shouldEmitMoves = shouldEmitPersonality = shouldEmitLSDA = false;
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79
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80 // If any landing pads survive, we need an EH table.
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81 bool hasLandingPads = !MMI->getLandingPads().empty();
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82
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83 // See if we need frame move info.
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84 AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();
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85 if (MoveType == AsmPrinter::CFI_M_EH ||
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86 (MoveType == AsmPrinter::CFI_M_Debug &&
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87 moveTypeModule == AsmPrinter::CFI_M_None))
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88 moveTypeModule = MoveType;
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89
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90 shouldEmitMoves = MoveType != AsmPrinter::CFI_M_None;
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91
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92 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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93 unsigned PerEncoding = TLOF.getPersonalityEncoding();
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94 const Function *Per = MMI->getPersonality();
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95
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96 shouldEmitPersonality = hasLandingPads &&
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97 PerEncoding != dwarf::DW_EH_PE_omit && Per;
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98
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99 unsigned LSDAEncoding = TLOF.getLSDAEncoding();
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100 shouldEmitLSDA = shouldEmitPersonality &&
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101 LSDAEncoding != dwarf::DW_EH_PE_omit;
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102
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103 if (!shouldEmitPersonality && !shouldEmitMoves)
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104 return;
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105
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106 Asm->OutStreamer.EmitCFIStartProc(/*IsSimple=*/false);
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107
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108 // Indicate personality routine, if any.
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109 if (!shouldEmitPersonality)
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110 return;
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111
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112 const MCSymbol *Sym =
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113 TLOF.getCFIPersonalitySymbol(Per, *Asm->Mang, Asm->TM, MMI);
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114 Asm->OutStreamer.EmitCFIPersonality(Sym, PerEncoding);
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115
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116 MCSymbol *EHBegin =
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117 Asm->GetTempSymbol("eh_func_begin", Asm->getFunctionNumber());
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118 if (Asm->MAI->useAssignmentForEHBegin()) {
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119 MCContext &Ctx = Asm->OutContext;
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120 MCSymbol *CurPos = Ctx.CreateTempSymbol();
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121 Asm->OutStreamer.EmitLabel(CurPos);
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122 Asm->OutStreamer.EmitAssignment(EHBegin,
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123 MCSymbolRefExpr::Create(CurPos, Ctx));
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124 } else {
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125 Asm->OutStreamer.EmitLabel(EHBegin);
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126 }
0
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127
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128 // Provide LSDA information.
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129 if (!shouldEmitLSDA)
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130 return;
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131
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132 Asm->OutStreamer.EmitCFILsda(Asm->GetTempSymbol("exception",
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133 Asm->getFunctionNumber()),
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134 LSDAEncoding);
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135 }
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136
33
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137 /// endFunction - Gather and emit post-function exception information.
0
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138 ///
33
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139 void DwarfCFIException::endFunction(const MachineFunction *) {
0
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140 if (!shouldEmitPersonality && !shouldEmitMoves)
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141 return;
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142
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143 Asm->OutStreamer.EmitCFIEndProc();
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144
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145 if (!shouldEmitPersonality)
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146 return;
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147
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148 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
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149 Asm->getFunctionNumber()));
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150
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151 // Map all labels and get rid of any dead landing pads.
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152 MMI->TidyLandingPads();
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153
77
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154 emitExceptionTable();
0
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155 }