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annotate lib/CodeGen/AsmPrinter/Win64Exception.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children e4204d083e25
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1 //===-- CodeGen/AsmPrinter/Win64Exception.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 Win64 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/Module.h"
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24 #include "llvm/MC/MCAsmInfo.h"
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25 #include "llvm/MC/MCContext.h"
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26 #include "llvm/MC/MCExpr.h"
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27 #include "llvm/MC/MCSection.h"
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28 #include "llvm/MC/MCStreamer.h"
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29 #include "llvm/MC/MCSymbol.h"
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30 #include "llvm/Support/Dwarf.h"
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31 #include "llvm/Support/ErrorHandling.h"
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32 #include "llvm/Support/FormattedStream.h"
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33 #include "llvm/Target/Mangler.h"
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34 #include "llvm/Target/TargetFrameLowering.h"
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35 #include "llvm/Target/TargetLoweringObjectFile.h"
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36 #include "llvm/Target/TargetOptions.h"
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37 #include "llvm/Target/TargetRegisterInfo.h"
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38 using namespace llvm;
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39
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40 Win64Exception::Win64Exception(AsmPrinter *A)
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41 : DwarfException(A),
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42 shouldEmitPersonality(false), shouldEmitLSDA(false), shouldEmitMoves(false)
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43 {}
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44
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45 Win64Exception::~Win64Exception() {}
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46
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47 /// EndModule - Emit all exception information that should come after the
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48 /// content.
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49 void Win64Exception::EndModule() {
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50 }
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51
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52 /// BeginFunction - Gather pre-function exception information. Assumes it's
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53 /// being emitted immediately after the function entry point.
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54 void Win64Exception::BeginFunction(const MachineFunction *MF) {
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55 shouldEmitMoves = shouldEmitPersonality = shouldEmitLSDA = false;
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56
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57 // If any landing pads survive, we need an EH table.
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58 bool hasLandingPads = !MMI->getLandingPads().empty();
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59
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60 shouldEmitMoves = Asm->needsSEHMoves();
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61
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62 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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63 unsigned PerEncoding = TLOF.getPersonalityEncoding();
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64 const Function *Per = MMI->getPersonalities()[MMI->getPersonalityIndex()];
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65
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66 shouldEmitPersonality = hasLandingPads &&
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67 PerEncoding != dwarf::DW_EH_PE_omit && Per;
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68
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69 unsigned LSDAEncoding = TLOF.getLSDAEncoding();
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70 shouldEmitLSDA = shouldEmitPersonality &&
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71 LSDAEncoding != dwarf::DW_EH_PE_omit;
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72
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73 if (!shouldEmitPersonality && !shouldEmitMoves)
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74 return;
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75
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76 Asm->OutStreamer.EmitWin64EHStartProc(Asm->CurrentFnSym);
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77
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78 if (!shouldEmitPersonality)
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79 return;
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80
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81 MCSymbol *GCCHandlerSym =
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82 Asm->GetExternalSymbolSymbol("_GCC_specific_handler");
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83 Asm->OutStreamer.EmitWin64EHHandler(GCCHandlerSym, true, true);
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84
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85 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
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86 Asm->getFunctionNumber()));
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87 }
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88
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89 /// EndFunction - Gather and emit post-function exception information.
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90 ///
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91 void Win64Exception::EndFunction() {
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92 if (!shouldEmitPersonality && !shouldEmitMoves)
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93 return;
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94
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95 Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
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96 Asm->getFunctionNumber()));
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97
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98 // Map all labels and get rid of any dead landing pads.
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99 MMI->TidyLandingPads();
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100
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101 if (shouldEmitPersonality) {
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102 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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103 const Function *Per = MMI->getPersonalities()[MMI->getPersonalityIndex()];
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104 const MCSymbol *Sym = TLOF.getCFIPersonalitySymbol(Per, Asm->Mang, MMI);
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105
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106 Asm->OutStreamer.PushSection();
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107 Asm->OutStreamer.EmitWin64EHHandlerData();
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108 Asm->OutStreamer.EmitValue(MCSymbolRefExpr::Create(Sym, Asm->OutContext),
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109 4);
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110 EmitExceptionTable();
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111 Asm->OutStreamer.PopSection();
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112 }
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113 Asm->OutStreamer.EmitWin64EHEndProc();
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114 }