annotate lib/CodeGen/WinEHPrepare.cpp @ 134:3a76565eade5 LLVM5.0.1

update 5.0.1
author mir3636
date Sat, 17 Feb 2018 09:57:20 +0900
parents 803732b1fca8
children c2174574ed3a
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1 //===-- WinEHPrepare - Prepare exception handling for code generation ---===//
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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 pass lowers LLVM IR exception handling into something closer to what the
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11 // backend wants for functions using a personality function from a runtime
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12 // provided by MSVC. Functions with other personality functions are left alone
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13 // and may be prepared by other passes. In particular, all supported MSVC
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14 // personality functions require cleanup code to be outlined, and the C++
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15 // personality requires catch handler code to be outlined.
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16 //
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17 //===----------------------------------------------------------------------===//
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18
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19 #include "llvm/ADT/DenseMap.h"
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20 #include "llvm/ADT/MapVector.h"
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21 #include "llvm/ADT/STLExtras.h"
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22 #include "llvm/Analysis/CFG.h"
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23 #include "llvm/Analysis/EHPersonalities.h"
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24 #include "llvm/CodeGen/MachineBasicBlock.h"
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25 #include "llvm/CodeGen/Passes.h"
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26 #include "llvm/CodeGen/WinEHFuncInfo.h"
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27 #include "llvm/IR/Verifier.h"
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28 #include "llvm/MC/MCSymbol.h"
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29 #include "llvm/Pass.h"
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30 #include "llvm/Support/Debug.h"
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31 #include "llvm/Support/raw_ostream.h"
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32 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
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33 #include "llvm/Transforms/Utils/Cloning.h"
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34 #include "llvm/Transforms/Utils/Local.h"
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35 #include "llvm/Transforms/Utils/SSAUpdater.h"
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36
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37 using namespace llvm;
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38
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39 #define DEBUG_TYPE "winehprepare"
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40
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41 static cl::opt<bool> DisableDemotion(
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42 "disable-demotion", cl::Hidden,
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43 cl::desc(
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44 "Clone multicolor basic blocks but do not demote cross funclet values"),
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45 cl::init(false));
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46
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47 static cl::opt<bool> DisableCleanups(
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48 "disable-cleanups", cl::Hidden,
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49 cl::desc("Do not remove implausible terminators or other similar cleanups"),
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50 cl::init(false));
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51
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52 namespace {
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53
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54 class WinEHPrepare : public FunctionPass {
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55 public:
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56 static char ID; // Pass identification, replacement for typeid.
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57 WinEHPrepare() : FunctionPass(ID) {}
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58
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59 bool runOnFunction(Function &Fn) override;
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60
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61 bool doFinalization(Module &M) override;
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62
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63 void getAnalysisUsage(AnalysisUsage &AU) const override;
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64
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65 StringRef getPassName() const override {
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66 return "Windows exception handling preparation";
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67 }
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68
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69 private:
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70 void insertPHIStores(PHINode *OriginalPHI, AllocaInst *SpillSlot);
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71 void
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72 insertPHIStore(BasicBlock *PredBlock, Value *PredVal, AllocaInst *SpillSlot,
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73 SmallVectorImpl<std::pair<BasicBlock *, Value *>> &Worklist);
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74 AllocaInst *insertPHILoads(PHINode *PN, Function &F);
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75 void replaceUseWithLoad(Value *V, Use &U, AllocaInst *&SpillSlot,
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76 DenseMap<BasicBlock *, Value *> &Loads, Function &F);
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77 bool prepareExplicitEH(Function &F);
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78 void colorFunclets(Function &F);
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79
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80 void demotePHIsOnFunclets(Function &F);
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81 void cloneCommonBlocks(Function &F);
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82 void removeImplausibleInstructions(Function &F);
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83 void cleanupPreparedFunclets(Function &F);
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84 void verifyPreparedFunclets(Function &F);
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85
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86 // All fields are reset by runOnFunction.
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87 EHPersonality Personality = EHPersonality::Unknown;
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88
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89 const DataLayout *DL = nullptr;
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90 DenseMap<BasicBlock *, ColorVector> BlockColors;
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91 MapVector<BasicBlock *, std::vector<BasicBlock *>> FuncletBlocks;
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92 };
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93
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94 } // end anonymous namespace
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96 char WinEHPrepare::ID = 0;
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97 INITIALIZE_PASS(WinEHPrepare, DEBUG_TYPE, "Prepare Windows exceptions",
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98 false, false)
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99
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100 FunctionPass *llvm::createWinEHPass() { return new WinEHPrepare(); }
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101
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102 bool WinEHPrepare::runOnFunction(Function &Fn) {
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103 if (!Fn.hasPersonalityFn())
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104 return false;
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105
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106 // Classify the personality to see what kind of preparation we need.
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107 Personality = classifyEHPersonality(Fn.getPersonalityFn());
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108
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109 // Do nothing if this is not a funclet-based personality.
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110 if (!isFuncletEHPersonality(Personality))
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111 return false;
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112
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113 DL = &Fn.getParent()->getDataLayout();
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114 return prepareExplicitEH(Fn);
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115 }
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116
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117 bool WinEHPrepare::doFinalization(Module &M) { return false; }
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118
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119 void WinEHPrepare::getAnalysisUsage(AnalysisUsage &AU) const {}
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121 static int addUnwindMapEntry(WinEHFuncInfo &FuncInfo, int ToState,
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122 const BasicBlock *BB) {
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123 CxxUnwindMapEntry UME;
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124 UME.ToState = ToState;
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125 UME.Cleanup = BB;
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126 FuncInfo.CxxUnwindMap.push_back(UME);
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127 return FuncInfo.getLastStateNumber();
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128 }
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129
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130 static void addTryBlockMapEntry(WinEHFuncInfo &FuncInfo, int TryLow,
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131 int TryHigh, int CatchHigh,
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132 ArrayRef<const CatchPadInst *> Handlers) {
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133 WinEHTryBlockMapEntry TBME;
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134 TBME.TryLow = TryLow;
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135 TBME.TryHigh = TryHigh;
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136 TBME.CatchHigh = CatchHigh;
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137 assert(TBME.TryLow <= TBME.TryHigh);
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138 for (const CatchPadInst *CPI : Handlers) {
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139 WinEHHandlerType HT;
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140 Constant *TypeInfo = cast<Constant>(CPI->getArgOperand(0));
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141 if (TypeInfo->isNullValue())
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142 HT.TypeDescriptor = nullptr;
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143 else
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144 HT.TypeDescriptor = cast<GlobalVariable>(TypeInfo->stripPointerCasts());
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145 HT.Adjectives = cast<ConstantInt>(CPI->getArgOperand(1))->getZExtValue();
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146 HT.Handler = CPI->getParent();
100
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147 if (auto *AI =
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148 dyn_cast<AllocaInst>(CPI->getArgOperand(2)->stripPointerCasts()))
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149 HT.CatchObj.Alloca = AI;
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150 else
95
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151 HT.CatchObj.Alloca = nullptr;
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152 TBME.HandlerArray.push_back(HT);
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153 }
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154 FuncInfo.TryBlockMap.push_back(TBME);
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155 }
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156
100
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157 static BasicBlock *getCleanupRetUnwindDest(const CleanupPadInst *CleanupPad) {
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158 for (const User *U : CleanupPad->users())
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159 if (const auto *CRI = dyn_cast<CleanupReturnInst>(U))
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160 return CRI->getUnwindDest();
95
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161 return nullptr;
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162 }
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163
100
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164 static void calculateStateNumbersForInvokes(const Function *Fn,
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165 WinEHFuncInfo &FuncInfo) {
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166 auto *F = const_cast<Function *>(Fn);
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167 DenseMap<BasicBlock *, ColorVector> BlockColors = colorEHFunclets(*F);
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168 for (BasicBlock &BB : *F) {
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169 auto *II = dyn_cast<InvokeInst>(BB.getTerminator());
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170 if (!II)
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171 continue;
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172
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173 auto &BBColors = BlockColors[&BB];
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174 assert(BBColors.size() == 1 && "multi-color BB not removed by preparation");
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175 BasicBlock *FuncletEntryBB = BBColors.front();
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176
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177 BasicBlock *FuncletUnwindDest;
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diff changeset
178 auto *FuncletPad =
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179 dyn_cast<FuncletPadInst>(FuncletEntryBB->getFirstNonPHI());
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180 assert(FuncletPad || FuncletEntryBB == &Fn->getEntryBlock());
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181 if (!FuncletPad)
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182 FuncletUnwindDest = nullptr;
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183 else if (auto *CatchPad = dyn_cast<CatchPadInst>(FuncletPad))
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184 FuncletUnwindDest = CatchPad->getCatchSwitch()->getUnwindDest();
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185 else if (auto *CleanupPad = dyn_cast<CleanupPadInst>(FuncletPad))
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186 FuncletUnwindDest = getCleanupRetUnwindDest(CleanupPad);
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187 else
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188 llvm_unreachable("unexpected funclet pad!");
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189
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190 BasicBlock *InvokeUnwindDest = II->getUnwindDest();
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191 int BaseState = -1;
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192 if (FuncletUnwindDest == InvokeUnwindDest) {
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193 auto BaseStateI = FuncInfo.FuncletBaseStateMap.find(FuncletPad);
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194 if (BaseStateI != FuncInfo.FuncletBaseStateMap.end())
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195 BaseState = BaseStateI->second;
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196 }
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197
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198 if (BaseState != -1) {
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199 FuncInfo.InvokeStateMap[II] = BaseState;
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200 } else {
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201 Instruction *PadInst = InvokeUnwindDest->getFirstNonPHI();
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202 assert(FuncInfo.EHPadStateMap.count(PadInst) && "EH Pad has no state!");
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203 FuncInfo.InvokeStateMap[II] = FuncInfo.EHPadStateMap[PadInst];
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204 }
95
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205 }
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206 }
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207
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208 // Given BB which ends in an unwind edge, return the EHPad that this BB belongs
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209 // to. If the unwind edge came from an invoke, return null.
100
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diff changeset
210 static const BasicBlock *getEHPadFromPredecessor(const BasicBlock *BB,
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diff changeset
211 Value *ParentPad) {
95
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diff changeset
212 const TerminatorInst *TI = BB->getTerminator();
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213 if (isa<InvokeInst>(TI))
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diff changeset
214 return nullptr;
100
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diff changeset
215 if (auto *CatchSwitch = dyn_cast<CatchSwitchInst>(TI)) {
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diff changeset
216 if (CatchSwitch->getParentPad() != ParentPad)
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diff changeset
217 return nullptr;
95
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diff changeset
218 return BB;
100
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diff changeset
219 }
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diff changeset
220 assert(!TI->isEHPad() && "unexpected EHPad!");
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diff changeset
221 auto *CleanupPad = cast<CleanupReturnInst>(TI)->getCleanupPad();
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diff changeset
222 if (CleanupPad->getParentPad() != ParentPad)
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diff changeset
223 return nullptr;
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224 return CleanupPad->getParent();
95
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diff changeset
225 }
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226
100
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diff changeset
227 static void calculateCXXStateNumbers(WinEHFuncInfo &FuncInfo,
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diff changeset
228 const Instruction *FirstNonPHI,
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diff changeset
229 int ParentState) {
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diff changeset
230 const BasicBlock *BB = FirstNonPHI->getParent();
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diff changeset
231 assert(BB->isEHPad() && "not a funclet!");
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diff changeset
232
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diff changeset
233 if (auto *CatchSwitch = dyn_cast<CatchSwitchInst>(FirstNonPHI)) {
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diff changeset
234 assert(FuncInfo.EHPadStateMap.count(CatchSwitch) == 0 &&
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diff changeset
235 "shouldn't revist catch funclets!");
95
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diff changeset
236
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diff changeset
237 SmallVector<const CatchPadInst *, 2> Handlers;
100
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diff changeset
238 for (const BasicBlock *CatchPadBB : CatchSwitch->handlers()) {
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diff changeset
239 auto *CatchPad = cast<CatchPadInst>(CatchPadBB->getFirstNonPHI());
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diff changeset
240 Handlers.push_back(CatchPad);
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diff changeset
241 }
95
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diff changeset
242 int TryLow = addUnwindMapEntry(FuncInfo, ParentState, nullptr);
100
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diff changeset
243 FuncInfo.EHPadStateMap[CatchSwitch] = TryLow;
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diff changeset
244 for (const BasicBlock *PredBlock : predecessors(BB))
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diff changeset
245 if ((PredBlock = getEHPadFromPredecessor(PredBlock,
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diff changeset
246 CatchSwitch->getParentPad())))
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diff changeset
247 calculateCXXStateNumbers(FuncInfo, PredBlock->getFirstNonPHI(),
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diff changeset
248 TryLow);
95
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diff changeset
249 int CatchLow = addUnwindMapEntry(FuncInfo, ParentState, nullptr);
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diff changeset
250
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diff changeset
251 // catchpads are separate funclets in C++ EH due to the way rethrow works.
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diff changeset
252 int TryHigh = CatchLow - 1;
100
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diff changeset
253 for (const auto *CatchPad : Handlers) {
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diff changeset
254 FuncInfo.FuncletBaseStateMap[CatchPad] = CatchLow;
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diff changeset
255 for (const User *U : CatchPad->users()) {
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diff changeset
256 const auto *UserI = cast<Instruction>(U);
120
1172e4bd9c6f update 4.0.0
mir3636
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diff changeset
257 if (auto *InnerCatchSwitch = dyn_cast<CatchSwitchInst>(UserI)) {
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diff changeset
258 BasicBlock *UnwindDest = InnerCatchSwitch->getUnwindDest();
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diff changeset
259 if (!UnwindDest || UnwindDest == CatchSwitch->getUnwindDest())
100
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diff changeset
260 calculateCXXStateNumbers(FuncInfo, UserI, CatchLow);
120
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261 }
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262 if (auto *InnerCleanupPad = dyn_cast<CleanupPadInst>(UserI)) {
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263 BasicBlock *UnwindDest = getCleanupRetUnwindDest(InnerCleanupPad);
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264 // If a nested cleanup pad reports a null unwind destination and the
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265 // enclosing catch pad doesn't it must be post-dominated by an
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266 // unreachable instruction.
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267 if (!UnwindDest || UnwindDest == CatchSwitch->getUnwindDest())
100
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268 calculateCXXStateNumbers(FuncInfo, UserI, CatchLow);
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269 }
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270 }
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271 }
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272 int CatchHigh = FuncInfo.getLastStateNumber();
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273 addTryBlockMapEntry(FuncInfo, TryLow, TryHigh, CatchHigh, Handlers);
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274 DEBUG(dbgs() << "TryLow[" << BB->getName() << "]: " << TryLow << '\n');
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275 DEBUG(dbgs() << "TryHigh[" << BB->getName() << "]: " << TryHigh << '\n');
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276 DEBUG(dbgs() << "CatchHigh[" << BB->getName() << "]: " << CatchHigh
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277 << '\n');
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278 } else {
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279 auto *CleanupPad = cast<CleanupPadInst>(FirstNonPHI);
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280
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281 // It's possible for a cleanup to be visited twice: it might have multiple
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282 // cleanupret instructions.
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283 if (FuncInfo.EHPadStateMap.count(CleanupPad))
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284 return;
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285
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286 int CleanupState = addUnwindMapEntry(FuncInfo, ParentState, BB);
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287 FuncInfo.EHPadStateMap[CleanupPad] = CleanupState;
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288 DEBUG(dbgs() << "Assigning state #" << CleanupState << " to BB "
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289 << BB->getName() << '\n');
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290 for (const BasicBlock *PredBlock : predecessors(BB)) {
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291 if ((PredBlock = getEHPadFromPredecessor(PredBlock,
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292 CleanupPad->getParentPad()))) {
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293 calculateCXXStateNumbers(FuncInfo, PredBlock->getFirstNonPHI(),
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294 CleanupState);
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295 }
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296 }
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297 for (const User *U : CleanupPad->users()) {
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298 const auto *UserI = cast<Instruction>(U);
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299 if (UserI->isEHPad())
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300 report_fatal_error("Cleanup funclets for the MSVC++ personality cannot "
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301 "contain exceptional actions");
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302 }
95
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303 }
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304 }
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305
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306 static int addSEHExcept(WinEHFuncInfo &FuncInfo, int ParentState,
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307 const Function *Filter, const BasicBlock *Handler) {
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308 SEHUnwindMapEntry Entry;
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309 Entry.ToState = ParentState;
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310 Entry.IsFinally = false;
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311 Entry.Filter = Filter;
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312 Entry.Handler = Handler;
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313 FuncInfo.SEHUnwindMap.push_back(Entry);
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314 return FuncInfo.SEHUnwindMap.size() - 1;
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315 }
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316
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317 static int addSEHFinally(WinEHFuncInfo &FuncInfo, int ParentState,
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318 const BasicBlock *Handler) {
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319 SEHUnwindMapEntry Entry;
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320 Entry.ToState = ParentState;
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321 Entry.IsFinally = true;
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322 Entry.Filter = nullptr;
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323 Entry.Handler = Handler;
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324 FuncInfo.SEHUnwindMap.push_back(Entry);
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325 return FuncInfo.SEHUnwindMap.size() - 1;
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326 }
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327
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328 static void calculateSEHStateNumbers(WinEHFuncInfo &FuncInfo,
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329 const Instruction *FirstNonPHI,
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330 int ParentState) {
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331 const BasicBlock *BB = FirstNonPHI->getParent();
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332 assert(BB->isEHPad() && "no a funclet!");
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333
100
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334 if (auto *CatchSwitch = dyn_cast<CatchSwitchInst>(FirstNonPHI)) {
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335 assert(FuncInfo.EHPadStateMap.count(CatchSwitch) == 0 &&
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336 "shouldn't revist catch funclets!");
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337
95
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338 // Extract the filter function and the __except basic block and create a
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339 // state for them.
100
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340 assert(CatchSwitch->getNumHandlers() == 1 &&
95
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341 "SEH doesn't have multiple handlers per __try");
100
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342 const auto *CatchPad =
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343 cast<CatchPadInst>((*CatchSwitch->handler_begin())->getFirstNonPHI());
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344 const BasicBlock *CatchPadBB = CatchPad->getParent();
95
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345 const Constant *FilterOrNull =
100
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346 cast<Constant>(CatchPad->getArgOperand(0)->stripPointerCasts());
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347 const Function *Filter = dyn_cast<Function>(FilterOrNull);
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diff changeset
348 assert((Filter || FilterOrNull->isNullValue()) &&
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diff changeset
349 "unexpected filter value");
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diff changeset
350 int TryState = addSEHExcept(FuncInfo, ParentState, Filter, CatchPadBB);
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351
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352 // Everything in the __try block uses TryState as its parent state.
100
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diff changeset
353 FuncInfo.EHPadStateMap[CatchSwitch] = TryState;
95
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diff changeset
354 DEBUG(dbgs() << "Assigning state #" << TryState << " to BB "
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355 << CatchPadBB->getName() << '\n');
100
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diff changeset
356 for (const BasicBlock *PredBlock : predecessors(BB))
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diff changeset
357 if ((PredBlock = getEHPadFromPredecessor(PredBlock,
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diff changeset
358 CatchSwitch->getParentPad())))
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diff changeset
359 calculateSEHStateNumbers(FuncInfo, PredBlock->getFirstNonPHI(),
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diff changeset
360 TryState);
95
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diff changeset
361
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diff changeset
362 // Everything in the __except block unwinds to ParentState, just like code
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diff changeset
363 // outside the __try.
100
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diff changeset
364 for (const User *U : CatchPad->users()) {
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365 const auto *UserI = cast<Instruction>(U);
120
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diff changeset
366 if (auto *InnerCatchSwitch = dyn_cast<CatchSwitchInst>(UserI)) {
1172e4bd9c6f update 4.0.0
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diff changeset
367 BasicBlock *UnwindDest = InnerCatchSwitch->getUnwindDest();
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diff changeset
368 if (!UnwindDest || UnwindDest == CatchSwitch->getUnwindDest())
100
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diff changeset
369 calculateSEHStateNumbers(FuncInfo, UserI, ParentState);
120
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diff changeset
370 }
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diff changeset
371 if (auto *InnerCleanupPad = dyn_cast<CleanupPadInst>(UserI)) {
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diff changeset
372 BasicBlock *UnwindDest = getCleanupRetUnwindDest(InnerCleanupPad);
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diff changeset
373 // If a nested cleanup pad reports a null unwind destination and the
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diff changeset
374 // enclosing catch pad doesn't it must be post-dominated by an
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diff changeset
375 // unreachable instruction.
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diff changeset
376 if (!UnwindDest || UnwindDest == CatchSwitch->getUnwindDest())
100
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diff changeset
377 calculateSEHStateNumbers(FuncInfo, UserI, ParentState);
120
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diff changeset
378 }
100
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diff changeset
379 }
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380 } else {
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diff changeset
381 auto *CleanupPad = cast<CleanupPadInst>(FirstNonPHI);
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diff changeset
382
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diff changeset
383 // It's possible for a cleanup to be visited twice: it might have multiple
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diff changeset
384 // cleanupret instructions.
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diff changeset
385 if (FuncInfo.EHPadStateMap.count(CleanupPad))
95
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diff changeset
386 return;
100
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diff changeset
387
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diff changeset
388 int CleanupState = addSEHFinally(FuncInfo, ParentState, BB);
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diff changeset
389 FuncInfo.EHPadStateMap[CleanupPad] = CleanupState;
95
afa8332a0e37 LLVM 3.8
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diff changeset
390 DEBUG(dbgs() << "Assigning state #" << CleanupState << " to BB "
100
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diff changeset
391 << BB->getName() << '\n');
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diff changeset
392 for (const BasicBlock *PredBlock : predecessors(BB))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
393 if ((PredBlock =
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
394 getEHPadFromPredecessor(PredBlock, CleanupPad->getParentPad())))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
395 calculateSEHStateNumbers(FuncInfo, PredBlock->getFirstNonPHI(),
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
396 CleanupState);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
397 for (const User *U : CleanupPad->users()) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
398 const auto *UserI = cast<Instruction>(U);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
399 if (UserI->isEHPad())
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
400 report_fatal_error("Cleanup funclets for the SEH personality cannot "
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
401 "contain exceptional actions");
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
402 }
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
403 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
404 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
405
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
406 static bool isTopLevelPadForMSVC(const Instruction *EHPad) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
407 if (auto *CatchSwitch = dyn_cast<CatchSwitchInst>(EHPad))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
408 return isa<ConstantTokenNone>(CatchSwitch->getParentPad()) &&
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
409 CatchSwitch->unwindsToCaller();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
410 if (auto *CleanupPad = dyn_cast<CleanupPadInst>(EHPad))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
411 return isa<ConstantTokenNone>(CleanupPad->getParentPad()) &&
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
412 getCleanupRetUnwindDest(CleanupPad) == nullptr;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
413 if (isa<CatchPadInst>(EHPad))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
414 return false;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
415 llvm_unreachable("unexpected EHPad!");
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
416 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
417
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
418 void llvm::calculateSEHStateNumbers(const Function *Fn,
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
419 WinEHFuncInfo &FuncInfo) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
420 // Don't compute state numbers twice.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
421 if (!FuncInfo.SEHUnwindMap.empty())
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
422 return;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
423
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
424 for (const BasicBlock &BB : *Fn) {
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
425 if (!BB.isEHPad())
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
426 continue;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
427 const Instruction *FirstNonPHI = BB.getFirstNonPHI();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
428 if (!isTopLevelPadForMSVC(FirstNonPHI))
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
429 continue;
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
430 ::calculateSEHStateNumbers(FuncInfo, FirstNonPHI, -1);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
431 }
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
432
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
433 calculateStateNumbersForInvokes(Fn, FuncInfo);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
434 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
435
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
436 void llvm::calculateWinCXXEHStateNumbers(const Function *Fn,
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
437 WinEHFuncInfo &FuncInfo) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
438 // Return if it's already been done.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
439 if (!FuncInfo.EHPadStateMap.empty())
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
440 return;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
441
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
442 for (const BasicBlock &BB : *Fn) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
443 if (!BB.isEHPad())
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
444 continue;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
445 const Instruction *FirstNonPHI = BB.getFirstNonPHI();
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
446 if (!isTopLevelPadForMSVC(FirstNonPHI))
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
447 continue;
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
448 calculateCXXStateNumbers(FuncInfo, FirstNonPHI, -1);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
449 }
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
450
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
451 calculateStateNumbersForInvokes(Fn, FuncInfo);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
452 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
453
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
454 static int addClrEHHandler(WinEHFuncInfo &FuncInfo, int HandlerParentState,
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
455 int TryParentState, ClrHandlerType HandlerType,
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
456 uint32_t TypeToken, const BasicBlock *Handler) {
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
457 ClrEHUnwindMapEntry Entry;
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
458 Entry.HandlerParentState = HandlerParentState;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
459 Entry.TryParentState = TryParentState;
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
460 Entry.Handler = Handler;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
461 Entry.HandlerType = HandlerType;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
462 Entry.TypeToken = TypeToken;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
463 FuncInfo.ClrEHUnwindMap.push_back(Entry);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
464 return FuncInfo.ClrEHUnwindMap.size() - 1;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
465 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
466
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
467 void llvm::calculateClrEHStateNumbers(const Function *Fn,
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
468 WinEHFuncInfo &FuncInfo) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
469 // Return if it's already been done.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
470 if (!FuncInfo.EHPadStateMap.empty())
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
471 return;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
472
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
473 // This numbering assigns one state number to each catchpad and cleanuppad.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
474 // It also computes two tree-like relations over states:
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
475 // 1) Each state has a "HandlerParentState", which is the state of the next
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
476 // outer handler enclosing this state's handler (same as nearest ancestor
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
477 // per the ParentPad linkage on EH pads, but skipping over catchswitches).
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
478 // 2) Each state has a "TryParentState", which:
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
479 // a) for a catchpad that's not the last handler on its catchswitch, is
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
480 // the state of the next catchpad on that catchswitch
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
481 // b) for all other pads, is the state of the pad whose try region is the
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
482 // next outer try region enclosing this state's try region. The "try
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
483 // regions are not present as such in the IR, but will be inferred
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
484 // based on the placement of invokes and pads which reach each other
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
485 // by exceptional exits
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
486 // Catchswitches do not get their own states, but each gets mapped to the
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
487 // state of its first catchpad.
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
488
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
489 // Step one: walk down from outermost to innermost funclets, assigning each
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
490 // catchpad and cleanuppad a state number. Add an entry to the
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
491 // ClrEHUnwindMap for each state, recording its HandlerParentState and
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
492 // handler attributes. Record the TryParentState as well for each catchpad
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
493 // that's not the last on its catchswitch, but initialize all other entries'
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
494 // TryParentStates to a sentinel -1 value that the next pass will update.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
495
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
496 // Seed a worklist with pads that have no parent.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
497 SmallVector<std::pair<const Instruction *, int>, 8> Worklist;
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
498 for (const BasicBlock &BB : *Fn) {
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
499 const Instruction *FirstNonPHI = BB.getFirstNonPHI();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
500 const Value *ParentPad;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
501 if (const auto *CPI = dyn_cast<CleanupPadInst>(FirstNonPHI))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
502 ParentPad = CPI->getParentPad();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
503 else if (const auto *CSI = dyn_cast<CatchSwitchInst>(FirstNonPHI))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
504 ParentPad = CSI->getParentPad();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
505 else
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
506 continue;
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
507 if (isa<ConstantTokenNone>(ParentPad))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
508 Worklist.emplace_back(FirstNonPHI, -1);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
509 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
510
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
511 // Use the worklist to visit all pads, from outer to inner. Record
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
512 // HandlerParentState for all pads. Record TryParentState only for catchpads
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
513 // that aren't the last on their catchswitch (setting all other entries'
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
514 // TryParentStates to an initial value of -1). This loop is also responsible
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
515 // for setting the EHPadStateMap entry for all catchpads, cleanuppads, and
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
516 // catchswitches.
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
517 while (!Worklist.empty()) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
518 const Instruction *Pad;
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
519 int HandlerParentState;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
520 std::tie(Pad, HandlerParentState) = Worklist.pop_back_val();
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
521
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
522 if (const auto *Cleanup = dyn_cast<CleanupPadInst>(Pad)) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
523 // Create the entry for this cleanup with the appropriate handler
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
524 // properties. Finally and fault handlers are distinguished by arity.
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
525 ClrHandlerType HandlerType =
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
526 (Cleanup->getNumArgOperands() ? ClrHandlerType::Fault
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
527 : ClrHandlerType::Finally);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
528 int CleanupState = addClrEHHandler(FuncInfo, HandlerParentState, -1,
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
529 HandlerType, 0, Pad->getParent());
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
530 // Queue any child EH pads on the worklist.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
531 for (const User *U : Cleanup->users())
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
532 if (const auto *I = dyn_cast<Instruction>(U))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
533 if (I->isEHPad())
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
534 Worklist.emplace_back(I, CleanupState);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
535 // Remember this pad's state.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
536 FuncInfo.EHPadStateMap[Cleanup] = CleanupState;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
537 } else {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
538 // Walk the handlers of this catchswitch in reverse order since all but
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
539 // the last need to set the following one as its TryParentState.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
540 const auto *CatchSwitch = cast<CatchSwitchInst>(Pad);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
541 int CatchState = -1, FollowerState = -1;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
542 SmallVector<const BasicBlock *, 4> CatchBlocks(CatchSwitch->handlers());
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
543 for (auto CBI = CatchBlocks.rbegin(), CBE = CatchBlocks.rend();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
544 CBI != CBE; ++CBI, FollowerState = CatchState) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
545 const BasicBlock *CatchBlock = *CBI;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
546 // Create the entry for this catch with the appropriate handler
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
547 // properties.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
548 const auto *Catch = cast<CatchPadInst>(CatchBlock->getFirstNonPHI());
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
549 uint32_t TypeToken = static_cast<uint32_t>(
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
550 cast<ConstantInt>(Catch->getArgOperand(0))->getZExtValue());
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
551 CatchState =
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
552 addClrEHHandler(FuncInfo, HandlerParentState, FollowerState,
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
553 ClrHandlerType::Catch, TypeToken, CatchBlock);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
554 // Queue any child EH pads on the worklist.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
555 for (const User *U : Catch->users())
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
556 if (const auto *I = dyn_cast<Instruction>(U))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
557 if (I->isEHPad())
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
558 Worklist.emplace_back(I, CatchState);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
559 // Remember this catch's state.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
560 FuncInfo.EHPadStateMap[Catch] = CatchState;
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
561 }
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
562 // Associate the catchswitch with the state of its first catch.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
563 assert(CatchSwitch->getNumHandlers());
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
564 FuncInfo.EHPadStateMap[CatchSwitch] = CatchState;
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
565 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
566 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
567
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
568 // Step two: record the TryParentState of each state. For cleanuppads that
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
569 // don't have cleanuprets, we may need to infer this from their child pads,
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
570 // so visit pads in descendant-most to ancestor-most order.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
571 for (auto Entry = FuncInfo.ClrEHUnwindMap.rbegin(),
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
572 End = FuncInfo.ClrEHUnwindMap.rend();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
573 Entry != End; ++Entry) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
574 const Instruction *Pad =
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
575 Entry->Handler.get<const BasicBlock *>()->getFirstNonPHI();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
576 // For most pads, the TryParentState is the state associated with the
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
577 // unwind dest of exceptional exits from it.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
578 const BasicBlock *UnwindDest;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
579 if (const auto *Catch = dyn_cast<CatchPadInst>(Pad)) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
580 // If a catch is not the last in its catchswitch, its TryParentState is
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
581 // the state associated with the next catch in the switch, even though
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
582 // that's not the unwind dest of exceptions escaping the catch. Those
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
583 // cases were already assigned a TryParentState in the first pass, so
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
584 // skip them.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
585 if (Entry->TryParentState != -1)
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
586 continue;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
587 // Otherwise, get the unwind dest from the catchswitch.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
588 UnwindDest = Catch->getCatchSwitch()->getUnwindDest();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
589 } else {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
590 const auto *Cleanup = cast<CleanupPadInst>(Pad);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
591 UnwindDest = nullptr;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
592 for (const User *U : Cleanup->users()) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
593 if (auto *CleanupRet = dyn_cast<CleanupReturnInst>(U)) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
594 // Common and unambiguous case -- cleanupret indicates cleanup's
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
595 // unwind dest.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
596 UnwindDest = CleanupRet->getUnwindDest();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
597 break;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
598 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
599
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
600 // Get an unwind dest for the user
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
601 const BasicBlock *UserUnwindDest = nullptr;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
602 if (auto *Invoke = dyn_cast<InvokeInst>(U)) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
603 UserUnwindDest = Invoke->getUnwindDest();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
604 } else if (auto *CatchSwitch = dyn_cast<CatchSwitchInst>(U)) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
605 UserUnwindDest = CatchSwitch->getUnwindDest();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
606 } else if (auto *ChildCleanup = dyn_cast<CleanupPadInst>(U)) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
607 int UserState = FuncInfo.EHPadStateMap[ChildCleanup];
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
608 int UserUnwindState =
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
609 FuncInfo.ClrEHUnwindMap[UserState].TryParentState;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
610 if (UserUnwindState != -1)
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
611 UserUnwindDest = FuncInfo.ClrEHUnwindMap[UserUnwindState]
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
612 .Handler.get<const BasicBlock *>();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
613 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
614
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
615 // Not having an unwind dest for this user might indicate that it
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
616 // doesn't unwind, so can't be taken as proof that the cleanup itself
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
617 // may unwind to caller (see e.g. SimplifyUnreachable and
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
618 // RemoveUnwindEdge).
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
619 if (!UserUnwindDest)
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
620 continue;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
621
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
622 // Now we have an unwind dest for the user, but we need to see if it
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
623 // unwinds all the way out of the cleanup or if it stays within it.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
624 const Instruction *UserUnwindPad = UserUnwindDest->getFirstNonPHI();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
625 const Value *UserUnwindParent;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
626 if (auto *CSI = dyn_cast<CatchSwitchInst>(UserUnwindPad))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
627 UserUnwindParent = CSI->getParentPad();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
628 else
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
629 UserUnwindParent =
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
630 cast<CleanupPadInst>(UserUnwindPad)->getParentPad();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
631
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
632 // The unwind stays within the cleanup iff it targets a child of the
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
633 // cleanup.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
634 if (UserUnwindParent == Cleanup)
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
635 continue;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
636
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
637 // This unwind exits the cleanup, so its dest is the cleanup's dest.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
638 UnwindDest = UserUnwindDest;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
639 break;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
640 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
641 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
642
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
643 // Record the state of the unwind dest as the TryParentState.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
644 int UnwindDestState;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
645
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
646 // If UnwindDest is null at this point, either the pad in question can
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
647 // be exited by unwind to caller, or it cannot be exited by unwind. In
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
648 // either case, reporting such cases as unwinding to caller is correct.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
649 // This can lead to EH tables that "look strange" -- if this pad's is in
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
650 // a parent funclet which has other children that do unwind to an enclosing
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
651 // pad, the try region for this pad will be missing the "duplicate" EH
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
652 // clause entries that you'd expect to see covering the whole parent. That
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
653 // should be benign, since the unwind never actually happens. If it were
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
654 // an issue, we could add a subsequent pass that pushes unwind dests down
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
655 // from parents that have them to children that appear to unwind to caller.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
656 if (!UnwindDest) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
657 UnwindDestState = -1;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
658 } else {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
659 UnwindDestState = FuncInfo.EHPadStateMap[UnwindDest->getFirstNonPHI()];
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
660 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
661
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
662 Entry->TryParentState = UnwindDestState;
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
663 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
664
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
665 // Step three: transfer information from pads to invokes.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
666 calculateStateNumbersForInvokes(Fn, FuncInfo);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
667 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
668
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
669 void WinEHPrepare::colorFunclets(Function &F) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
670 BlockColors = colorEHFunclets(F);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
671
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
672 // Invert the map from BB to colors to color to BBs.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
673 for (BasicBlock &BB : F) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
674 ColorVector &Colors = BlockColors[&BB];
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
675 for (BasicBlock *Color : Colors)
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
676 FuncletBlocks[Color].push_back(&BB);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
677 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
678 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
679
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
680 void WinEHPrepare::demotePHIsOnFunclets(Function &F) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
681 // Strip PHI nodes off of EH pads.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
682 SmallVector<PHINode *, 16> PHINodes;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
683 for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE;) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
684 BasicBlock *BB = &*FI++;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
685 if (!BB->isEHPad())
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
686 continue;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
687 for (BasicBlock::iterator BI = BB->begin(), BE = BB->end(); BI != BE;) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
688 Instruction *I = &*BI++;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
689 auto *PN = dyn_cast<PHINode>(I);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
690 // Stop at the first non-PHI.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
691 if (!PN)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
692 break;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
693
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
694 AllocaInst *SpillSlot = insertPHILoads(PN, F);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
695 if (SpillSlot)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
696 insertPHIStores(PN, SpillSlot);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
697
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
698 PHINodes.push_back(PN);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
699 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
700 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
701
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
702 for (auto *PN : PHINodes) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
703 // There may be lingering uses on other EH PHIs being removed
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
704 PN->replaceAllUsesWith(UndefValue::get(PN->getType()));
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
705 PN->eraseFromParent();
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
706 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
707 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
708
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
709 void WinEHPrepare::cloneCommonBlocks(Function &F) {
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
710 // We need to clone all blocks which belong to multiple funclets. Values are
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
711 // remapped throughout the funclet to propagate both the new instructions
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
712 // *and* the new basic blocks themselves.
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
713 for (auto &Funclets : FuncletBlocks) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
714 BasicBlock *FuncletPadBB = Funclets.first;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
715 std::vector<BasicBlock *> &BlocksInFunclet = Funclets.second;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
716 Value *FuncletToken;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
717 if (FuncletPadBB == &F.getEntryBlock())
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
718 FuncletToken = ConstantTokenNone::get(F.getContext());
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
719 else
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
720 FuncletToken = FuncletPadBB->getFirstNonPHI();
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
721
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
722 std::vector<std::pair<BasicBlock *, BasicBlock *>> Orig2Clone;
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
723 ValueToValueMapTy VMap;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
724 for (BasicBlock *BB : BlocksInFunclet) {
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
725 ColorVector &ColorsForBB = BlockColors[BB];
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
726 // We don't need to do anything if the block is monochromatic.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
727 size_t NumColorsForBB = ColorsForBB.size();
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
728 if (NumColorsForBB == 1)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
729 continue;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
730
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
731 DEBUG_WITH_TYPE("winehprepare-coloring",
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
732 dbgs() << " Cloning block \'" << BB->getName()
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
733 << "\' for funclet \'" << FuncletPadBB->getName()
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
734 << "\'.\n");
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
735
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
736 // Create a new basic block and copy instructions into it!
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
737 BasicBlock *CBB =
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
738 CloneBasicBlock(BB, VMap, Twine(".for.", FuncletPadBB->getName()));
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
739 // Insert the clone immediately after the original to ensure determinism
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
740 // and to keep the same relative ordering of any funclet's blocks.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
741 CBB->insertInto(&F, BB->getNextNode());
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
742
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
743 // Add basic block mapping.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
744 VMap[BB] = CBB;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
745
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
746 // Record delta operations that we need to perform to our color mappings.
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
747 Orig2Clone.emplace_back(BB, CBB);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
748 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
749
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
750 // If nothing was cloned, we're done cloning in this funclet.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
751 if (Orig2Clone.empty())
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
752 continue;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
753
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
754 // Update our color mappings to reflect that one block has lost a color and
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
755 // another has gained a color.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
756 for (auto &BBMapping : Orig2Clone) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
757 BasicBlock *OldBlock = BBMapping.first;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
758 BasicBlock *NewBlock = BBMapping.second;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
759
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
760 BlocksInFunclet.push_back(NewBlock);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
761 ColorVector &NewColors = BlockColors[NewBlock];
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
762 assert(NewColors.empty() && "A new block should only have one color!");
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
763 NewColors.push_back(FuncletPadBB);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
764
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
765 DEBUG_WITH_TYPE("winehprepare-coloring",
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
766 dbgs() << " Assigned color \'" << FuncletPadBB->getName()
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
767 << "\' to block \'" << NewBlock->getName()
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
768 << "\'.\n");
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
769
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
770 BlocksInFunclet.erase(
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
771 std::remove(BlocksInFunclet.begin(), BlocksInFunclet.end(), OldBlock),
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
772 BlocksInFunclet.end());
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
773 ColorVector &OldColors = BlockColors[OldBlock];
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
774 OldColors.erase(
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
775 std::remove(OldColors.begin(), OldColors.end(), FuncletPadBB),
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
776 OldColors.end());
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
777
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
778 DEBUG_WITH_TYPE("winehprepare-coloring",
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
779 dbgs() << " Removed color \'" << FuncletPadBB->getName()
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
780 << "\' from block \'" << OldBlock->getName()
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
781 << "\'.\n");
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
782 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
783
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
784 // Loop over all of the instructions in this funclet, fixing up operand
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
785 // references as we go. This uses VMap to do all the hard work.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
786 for (BasicBlock *BB : BlocksInFunclet)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
787 // Loop over all instructions, fixing each one as we find it...
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
788 for (Instruction &I : *BB)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
789 RemapInstruction(&I, VMap,
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
790 RF_IgnoreMissingLocals | RF_NoModuleLevelChanges);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
791
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
792 // Catchrets targeting cloned blocks need to be updated separately from
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
793 // the loop above because they are not in the current funclet.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
794 SmallVector<CatchReturnInst *, 2> FixupCatchrets;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
795 for (auto &BBMapping : Orig2Clone) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
796 BasicBlock *OldBlock = BBMapping.first;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
797 BasicBlock *NewBlock = BBMapping.second;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
798
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
799 FixupCatchrets.clear();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
800 for (BasicBlock *Pred : predecessors(OldBlock))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
801 if (auto *CatchRet = dyn_cast<CatchReturnInst>(Pred->getTerminator()))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
802 if (CatchRet->getCatchSwitchParentPad() == FuncletToken)
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
803 FixupCatchrets.push_back(CatchRet);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
804
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
805 for (CatchReturnInst *CatchRet : FixupCatchrets)
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
806 CatchRet->setSuccessor(NewBlock);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
807 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
808
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
809 auto UpdatePHIOnClonedBlock = [&](PHINode *PN, bool IsForOldBlock) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
810 unsigned NumPreds = PN->getNumIncomingValues();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
811 for (unsigned PredIdx = 0, PredEnd = NumPreds; PredIdx != PredEnd;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
812 ++PredIdx) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
813 BasicBlock *IncomingBlock = PN->getIncomingBlock(PredIdx);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
814 bool EdgeTargetsFunclet;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
815 if (auto *CRI =
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
816 dyn_cast<CatchReturnInst>(IncomingBlock->getTerminator())) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
817 EdgeTargetsFunclet = (CRI->getCatchSwitchParentPad() == FuncletToken);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
818 } else {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
819 ColorVector &IncomingColors = BlockColors[IncomingBlock];
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
820 assert(!IncomingColors.empty() && "Block not colored!");
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
821 assert((IncomingColors.size() == 1 ||
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
822 llvm::all_of(IncomingColors,
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
823 [&](BasicBlock *Color) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
824 return Color != FuncletPadBB;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
825 })) &&
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
826 "Cloning should leave this funclet's blocks monochromatic");
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
827 EdgeTargetsFunclet = (IncomingColors.front() == FuncletPadBB);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
828 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
829 if (IsForOldBlock != EdgeTargetsFunclet)
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
830 continue;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
831 PN->removeIncomingValue(IncomingBlock, /*DeletePHIIfEmpty=*/false);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
832 // Revisit the next entry.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
833 --PredIdx;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
834 --PredEnd;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
835 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
836 };
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
837
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
838 for (auto &BBMapping : Orig2Clone) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
839 BasicBlock *OldBlock = BBMapping.first;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
840 BasicBlock *NewBlock = BBMapping.second;
134
3a76565eade5 update 5.0.1
mir3636
parents: 121
diff changeset
841 for (PHINode &OldPN : OldBlock->phis()) {
3a76565eade5 update 5.0.1
mir3636
parents: 121
diff changeset
842 UpdatePHIOnClonedBlock(&OldPN, /*IsForOldBlock=*/true);
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
843 }
134
3a76565eade5 update 5.0.1
mir3636
parents: 121
diff changeset
844 for (PHINode &NewPN : NewBlock->phis()) {
3a76565eade5 update 5.0.1
mir3636
parents: 121
diff changeset
845 UpdatePHIOnClonedBlock(&NewPN, /*IsForOldBlock=*/false);
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
846 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
847 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
848
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
849 // Check to see if SuccBB has PHI nodes. If so, we need to add entries to
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
850 // the PHI nodes for NewBB now.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
851 for (auto &BBMapping : Orig2Clone) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
852 BasicBlock *OldBlock = BBMapping.first;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
853 BasicBlock *NewBlock = BBMapping.second;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
854 for (BasicBlock *SuccBB : successors(NewBlock)) {
134
3a76565eade5 update 5.0.1
mir3636
parents: 121
diff changeset
855 for (PHINode &SuccPN : SuccBB->phis()) {
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
856 // Ok, we have a PHI node. Figure out what the incoming value was for
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
857 // the OldBlock.
134
3a76565eade5 update 5.0.1
mir3636
parents: 121
diff changeset
858 int OldBlockIdx = SuccPN.getBasicBlockIndex(OldBlock);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
859 if (OldBlockIdx == -1)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
860 break;
134
3a76565eade5 update 5.0.1
mir3636
parents: 121
diff changeset
861 Value *IV = SuccPN.getIncomingValue(OldBlockIdx);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
862
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
863 // Remap the value if necessary.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
864 if (auto *Inst = dyn_cast<Instruction>(IV)) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
865 ValueToValueMapTy::iterator I = VMap.find(Inst);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
866 if (I != VMap.end())
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
867 IV = I->second;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
868 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
869
134
3a76565eade5 update 5.0.1
mir3636
parents: 121
diff changeset
870 SuccPN.addIncoming(IV, NewBlock);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
871 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
872 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
873 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
874
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
875 for (ValueToValueMapTy::value_type VT : VMap) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
876 // If there were values defined in BB that are used outside the funclet,
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
877 // then we now have to update all uses of the value to use either the
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
878 // original value, the cloned value, or some PHI derived value. This can
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
879 // require arbitrary PHI insertion, of which we are prepared to do, clean
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
880 // these up now.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
881 SmallVector<Use *, 16> UsesToRename;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
882
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
883 auto *OldI = dyn_cast<Instruction>(const_cast<Value *>(VT.first));
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
884 if (!OldI)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
885 continue;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
886 auto *NewI = cast<Instruction>(VT.second);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
887 // Scan all uses of this instruction to see if it is used outside of its
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
888 // funclet, and if so, record them in UsesToRename.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
889 for (Use &U : OldI->uses()) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
890 Instruction *UserI = cast<Instruction>(U.getUser());
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
891 BasicBlock *UserBB = UserI->getParent();
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
892 ColorVector &ColorsForUserBB = BlockColors[UserBB];
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
893 assert(!ColorsForUserBB.empty());
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
894 if (ColorsForUserBB.size() > 1 ||
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
895 *ColorsForUserBB.begin() != FuncletPadBB)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
896 UsesToRename.push_back(&U);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
897 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
898
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
899 // If there are no uses outside the block, we're done with this
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
900 // instruction.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
901 if (UsesToRename.empty())
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
902 continue;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
903
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
904 // We found a use of OldI outside of the funclet. Rename all uses of OldI
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
905 // that are outside its funclet to be uses of the appropriate PHI node
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
906 // etc.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
907 SSAUpdater SSAUpdate;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
908 SSAUpdate.Initialize(OldI->getType(), OldI->getName());
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
909 SSAUpdate.AddAvailableValue(OldI->getParent(), OldI);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
910 SSAUpdate.AddAvailableValue(NewI->getParent(), NewI);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
911
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
912 while (!UsesToRename.empty())
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
913 SSAUpdate.RewriteUseAfterInsertions(*UsesToRename.pop_back_val());
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
914 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
915 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
916 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
917
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
918 void WinEHPrepare::removeImplausibleInstructions(Function &F) {
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
919 // Remove implausible terminators and replace them with UnreachableInst.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
920 for (auto &Funclet : FuncletBlocks) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
921 BasicBlock *FuncletPadBB = Funclet.first;
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
922 std::vector<BasicBlock *> &BlocksInFunclet = Funclet.second;
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
923 Instruction *FirstNonPHI = FuncletPadBB->getFirstNonPHI();
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
924 auto *FuncletPad = dyn_cast<FuncletPadInst>(FirstNonPHI);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
925 auto *CatchPad = dyn_cast_or_null<CatchPadInst>(FuncletPad);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
926 auto *CleanupPad = dyn_cast_or_null<CleanupPadInst>(FuncletPad);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
927
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
928 for (BasicBlock *BB : BlocksInFunclet) {
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
929 for (Instruction &I : *BB) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
930 CallSite CS(&I);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
931 if (!CS)
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
932 continue;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
933
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
934 Value *FuncletBundleOperand = nullptr;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
935 if (auto BU = CS.getOperandBundle(LLVMContext::OB_funclet))
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
936 FuncletBundleOperand = BU->Inputs.front();
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
937
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
938 if (FuncletBundleOperand == FuncletPad)
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
939 continue;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
940
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
941 // Skip call sites which are nounwind intrinsics or inline asm.
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
942 auto *CalledFn =
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
943 dyn_cast<Function>(CS.getCalledValue()->stripPointerCasts());
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
944 if (CalledFn && ((CalledFn->isIntrinsic() && CS.doesNotThrow()) ||
1172e4bd9c6f update 4.0.0
mir3636
parents: 100
diff changeset
945 CS.isInlineAsm()))
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
946 continue;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
947
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
948 // This call site was not part of this funclet, remove it.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
949 if (CS.isInvoke()) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
950 // Remove the unwind edge if it was an invoke.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
951 removeUnwindEdge(BB);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
952 // Get a pointer to the new call.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
953 BasicBlock::iterator CallI =
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
954 std::prev(BB->getTerminator()->getIterator());
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
955 auto *CI = cast<CallInst>(&*CallI);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
956 changeToUnreachable(CI, /*UseLLVMTrap=*/false);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
957 } else {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
958 changeToUnreachable(&I, /*UseLLVMTrap=*/false);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
959 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
960
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
961 // There are no more instructions in the block (except for unreachable),
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
962 // we are done.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
963 break;
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
964 }
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
965
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
966 TerminatorInst *TI = BB->getTerminator();
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
967 // CatchPadInst and CleanupPadInst can't transfer control to a ReturnInst.
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
968 bool IsUnreachableRet = isa<ReturnInst>(TI) && FuncletPad;
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
969 // The token consumed by a CatchReturnInst must match the funclet token.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
970 bool IsUnreachableCatchret = false;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
971 if (auto *CRI = dyn_cast<CatchReturnInst>(TI))
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
972 IsUnreachableCatchret = CRI->getCatchPad() != CatchPad;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
973 // The token consumed by a CleanupReturnInst must match the funclet token.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
974 bool IsUnreachableCleanupret = false;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
975 if (auto *CRI = dyn_cast<CleanupReturnInst>(TI))
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
976 IsUnreachableCleanupret = CRI->getCleanupPad() != CleanupPad;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
977 if (IsUnreachableRet || IsUnreachableCatchret ||
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
978 IsUnreachableCleanupret) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
979 changeToUnreachable(TI, /*UseLLVMTrap=*/false);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
980 } else if (isa<InvokeInst>(TI)) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
981 if (Personality == EHPersonality::MSVC_CXX && CleanupPad) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
982 // Invokes within a cleanuppad for the MSVC++ personality never
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
983 // transfer control to their unwind edge: the personality will
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
984 // terminate the program.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
985 removeUnwindEdge(BB);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
986 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
987 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
988 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
989 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
990 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
991
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
992 void WinEHPrepare::cleanupPreparedFunclets(Function &F) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
993 // Clean-up some of the mess we made by removing useles PHI nodes, trivial
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
994 // branches, etc.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
995 for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE;) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
996 BasicBlock *BB = &*FI++;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
997 SimplifyInstructionsInBlock(BB);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
998 ConstantFoldTerminator(BB, /*DeleteDeadConditions=*/true);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
999 MergeBlockIntoPredecessor(BB);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1000 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1001
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1002 // We might have some unreachable blocks after cleaning up some impossible
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1003 // control flow.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1004 removeUnreachableBlocks(F);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1005 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1006
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
1007 #ifndef NDEBUG
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1008 void WinEHPrepare::verifyPreparedFunclets(Function &F) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1009 for (BasicBlock &BB : F) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1010 size_t NumColors = BlockColors[&BB].size();
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1011 assert(NumColors == 1 && "Expected monochromatic BB!");
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1012 if (NumColors == 0)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1013 report_fatal_error("Uncolored BB!");
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1014 if (NumColors > 1)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1015 report_fatal_error("Multicolor BB!");
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1016 assert((DisableDemotion || !(BB.isEHPad() && isa<PHINode>(BB.begin()))) &&
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1017 "EH Pad still has a PHI!");
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1018 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1019 }
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
1020 #endif
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1021
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1022 bool WinEHPrepare::prepareExplicitEH(Function &F) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1023 // Remove unreachable blocks. It is not valuable to assign them a color and
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1024 // their existence can trick us into thinking values are alive when they are
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1025 // not.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1026 removeUnreachableBlocks(F);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1027
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1028 // Determine which blocks are reachable from which funclet entries.
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1029 colorFunclets(F);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1030
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1031 cloneCommonBlocks(F);
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1032
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1033 if (!DisableDemotion)
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1034 demotePHIsOnFunclets(F);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1035
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1036 if (!DisableCleanups) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1037 DEBUG(verifyFunction(F));
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1038 removeImplausibleInstructions(F);
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1039
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1040 DEBUG(verifyFunction(F));
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1041 cleanupPreparedFunclets(F);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1042 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1043
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1044 DEBUG(verifyPreparedFunclets(F));
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1045 // Recolor the CFG to verify that all is well.
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1046 DEBUG(colorFunclets(F));
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1047 DEBUG(verifyPreparedFunclets(F));
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1048
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1049 BlockColors.clear();
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1050 FuncletBlocks.clear();
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents:
diff changeset
1051
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents:
diff changeset
1052 return true;
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents:
diff changeset
1053 }
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents:
diff changeset
1054
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1055 // TODO: Share loads when one use dominates another, or when a catchpad exit
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1056 // dominates uses (needs dominators).
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1057 AllocaInst *WinEHPrepare::insertPHILoads(PHINode *PN, Function &F) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1058 BasicBlock *PHIBlock = PN->getParent();
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1059 AllocaInst *SpillSlot = nullptr;
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1060 Instruction *EHPad = PHIBlock->getFirstNonPHI();
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1061
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1062 if (!isa<TerminatorInst>(EHPad)) {
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1063 // If the EHPad isn't a terminator, then we can insert a load in this block
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1064 // that will dominate all uses.
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
1065 SpillSlot = new AllocaInst(PN->getType(), DL->getAllocaAddrSpace(), nullptr,
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1066 Twine(PN->getName(), ".wineh.spillslot"),
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1067 &F.getEntryBlock().front());
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1068 Value *V = new LoadInst(SpillSlot, Twine(PN->getName(), ".wineh.reload"),
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1069 &*PHIBlock->getFirstInsertionPt());
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1070 PN->replaceAllUsesWith(V);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1071 return SpillSlot;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1072 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1073
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1074 // Otherwise, we have a PHI on a terminator EHPad, and we give up and insert
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1075 // loads of the slot before every use.
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1076 DenseMap<BasicBlock *, Value *> Loads;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1077 for (Value::use_iterator UI = PN->use_begin(), UE = PN->use_end();
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1078 UI != UE;) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1079 Use &U = *UI++;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1080 auto *UsingInst = cast<Instruction>(U.getUser());
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1081 if (isa<PHINode>(UsingInst) && UsingInst->getParent()->isEHPad()) {
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1082 // Use is on an EH pad phi. Leave it alone; we'll insert loads and
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1083 // stores for it separately.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1084 continue;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1085 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1086 replaceUseWithLoad(PN, U, SpillSlot, Loads, F);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1087 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1088 return SpillSlot;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1089 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1090
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1091 // TODO: improve store placement. Inserting at def is probably good, but need
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1092 // to be careful not to introduce interfering stores (needs liveness analysis).
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1093 // TODO: identify related phi nodes that can share spill slots, and share them
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1094 // (also needs liveness).
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1095 void WinEHPrepare::insertPHIStores(PHINode *OriginalPHI,
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1096 AllocaInst *SpillSlot) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1097 // Use a worklist of (Block, Value) pairs -- the given Value needs to be
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1098 // stored to the spill slot by the end of the given Block.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1099 SmallVector<std::pair<BasicBlock *, Value *>, 4> Worklist;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1100
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1101 Worklist.push_back({OriginalPHI->getParent(), OriginalPHI});
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1102
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1103 while (!Worklist.empty()) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1104 BasicBlock *EHBlock;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1105 Value *InVal;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1106 std::tie(EHBlock, InVal) = Worklist.pop_back_val();
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1107
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1108 PHINode *PN = dyn_cast<PHINode>(InVal);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1109 if (PN && PN->getParent() == EHBlock) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1110 // The value is defined by another PHI we need to remove, with no room to
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1111 // insert a store after the PHI, so each predecessor needs to store its
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1112 // incoming value.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1113 for (unsigned i = 0, e = PN->getNumIncomingValues(); i < e; ++i) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1114 Value *PredVal = PN->getIncomingValue(i);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1115
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1116 // Undef can safely be skipped.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1117 if (isa<UndefValue>(PredVal))
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1118 continue;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1119
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1120 insertPHIStore(PN->getIncomingBlock(i), PredVal, SpillSlot, Worklist);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1121 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1122 } else {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1123 // We need to store InVal, which dominates EHBlock, but can't put a store
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1124 // in EHBlock, so need to put stores in each predecessor.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1125 for (BasicBlock *PredBlock : predecessors(EHBlock)) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1126 insertPHIStore(PredBlock, InVal, SpillSlot, Worklist);
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1127 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1128 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1129 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1130 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1131
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1132 void WinEHPrepare::insertPHIStore(
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1133 BasicBlock *PredBlock, Value *PredVal, AllocaInst *SpillSlot,
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1134 SmallVectorImpl<std::pair<BasicBlock *, Value *>> &Worklist) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1135
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1136 if (PredBlock->isEHPad() &&
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1137 isa<TerminatorInst>(PredBlock->getFirstNonPHI())) {
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1138 // Pred is unsplittable, so we need to queue it on the worklist.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1139 Worklist.push_back({PredBlock, PredVal});
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1140 return;
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1141 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1142
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1143 // Otherwise, insert the store at the end of the basic block.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1144 new StoreInst(PredVal, SpillSlot, PredBlock->getTerminator());
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents:
diff changeset
1145 }
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents:
diff changeset
1146
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1147 void WinEHPrepare::replaceUseWithLoad(Value *V, Use &U, AllocaInst *&SpillSlot,
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1148 DenseMap<BasicBlock *, Value *> &Loads,
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1149 Function &F) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1150 // Lazilly create the spill slot.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1151 if (!SpillSlot)
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
1152 SpillSlot = new AllocaInst(V->getType(), DL->getAllocaAddrSpace(), nullptr,
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1153 Twine(V->getName(), ".wineh.spillslot"),
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1154 &F.getEntryBlock().front());
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1155
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1156 auto *UsingInst = cast<Instruction>(U.getUser());
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1157 if (auto *UsingPHI = dyn_cast<PHINode>(UsingInst)) {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1158 // If this is a PHI node, we can't insert a load of the value before
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1159 // the use. Instead insert the load in the predecessor block
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1160 // corresponding to the incoming value.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1161 //
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1162 // Note that if there are multiple edges from a basic block to this
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1163 // PHI node that we cannot have multiple loads. The problem is that
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1164 // the resulting PHI node will have multiple values (from each load)
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1165 // coming in from the same block, which is illegal SSA form.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1166 // For this reason, we keep track of and reuse loads we insert.
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1167 BasicBlock *IncomingBlock = UsingPHI->getIncomingBlock(U);
afa8332a0e37 LLVM 3.8
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parents: 83
diff changeset
1168 if (auto *CatchRet =
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1169 dyn_cast<CatchReturnInst>(IncomingBlock->getTerminator())) {
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parents: 83
diff changeset
1170 // Putting a load above a catchret and use on the phi would still leave
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1171 // a cross-funclet def/use. We need to split the edge, change the
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1172 // catchret to target the new block, and put the load there.
afa8332a0e37 LLVM 3.8
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parents: 83
diff changeset
1173 BasicBlock *PHIBlock = UsingInst->getParent();
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parents: 83
diff changeset
1174 BasicBlock *NewBlock = SplitEdge(IncomingBlock, PHIBlock);
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parents: 83
diff changeset
1175 // SplitEdge gives us:
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parents: 83
diff changeset
1176 // IncomingBlock:
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parents: 83
diff changeset
1177 // ...
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parents: 83
diff changeset
1178 // br label %NewBlock
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parents: 83
diff changeset
1179 // NewBlock:
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parents: 83
diff changeset
1180 // catchret label %PHIBlock
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parents: 83
diff changeset
1181 // But we need:
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parents: 83
diff changeset
1182 // IncomingBlock:
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parents: 83
diff changeset
1183 // ...
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parents: 83
diff changeset
1184 // catchret label %NewBlock
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parents: 83
diff changeset
1185 // NewBlock:
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1186 // br label %PHIBlock
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parents: 83
diff changeset
1187 // So move the terminators to each others' blocks and swap their
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parents: 83
diff changeset
1188 // successors.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1189 BranchInst *Goto = cast<BranchInst>(IncomingBlock->getTerminator());
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1190 Goto->removeFromParent();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1191 CatchRet->removeFromParent();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1192 IncomingBlock->getInstList().push_back(CatchRet);
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parents: 83
diff changeset
1193 NewBlock->getInstList().push_back(Goto);
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parents: 83
diff changeset
1194 Goto->setSuccessor(0, PHIBlock);
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parents: 83
diff changeset
1195 CatchRet->setSuccessor(NewBlock);
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parents: 83
diff changeset
1196 // Update the color mapping for the newly split edge.
121
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kono
parents: 120
diff changeset
1197 // Grab a reference to the ColorVector to be inserted before getting the
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kono
parents: 120
diff changeset
1198 // reference to the vector we are copying because inserting the new
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kono
parents: 120
diff changeset
1199 // element in BlockColors might cause the map to be reallocated.
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kono
parents: 120
diff changeset
1200 ColorVector &ColorsForNewBlock = BlockColors[NewBlock];
100
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parents: 95
diff changeset
1201 ColorVector &ColorsForPHIBlock = BlockColors[PHIBlock];
121
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kono
parents: 120
diff changeset
1202 ColorsForNewBlock = ColorsForPHIBlock;
95
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parents: 83
diff changeset
1203 for (BasicBlock *FuncletPad : ColorsForPHIBlock)
100
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parents: 95
diff changeset
1204 FuncletBlocks[FuncletPad].push_back(NewBlock);
95
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parents: 83
diff changeset
1205 // Treat the new block as incoming for load insertion.
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parents: 83
diff changeset
1206 IncomingBlock = NewBlock;
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parents: 83
diff changeset
1207 }
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parents: 83
diff changeset
1208 Value *&Load = Loads[IncomingBlock];
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parents: 83
diff changeset
1209 // Insert the load into the predecessor block
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1210 if (!Load)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1211 Load = new LoadInst(SpillSlot, Twine(V->getName(), ".wineh.reload"),
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1212 /*Volatile=*/false, IncomingBlock->getTerminator());
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parents: 83
diff changeset
1213
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parents: 83
diff changeset
1214 U.set(Load);
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parents: 83
diff changeset
1215 } else {
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parents: 83
diff changeset
1216 // Reload right before the old use.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1217 auto *Load = new LoadInst(SpillSlot, Twine(V->getName(), ".wineh.reload"),
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1218 /*Volatile=*/false, UsingInst);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1219 U.set(Load);
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parents: 83
diff changeset
1220 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1221 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1222
100
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1223 void WinEHFuncInfo::addIPToStateRange(const InvokeInst *II,
95
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
1224 MCSymbol *InvokeBegin,
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parents: 83
diff changeset
1225 MCSymbol *InvokeEnd) {
100
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parents: 95
diff changeset
1226 assert(InvokeStateMap.count(II) &&
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1227 "should get invoke with precomputed state");
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1228 LabelToStateMap[InvokeBegin] = std::make_pair(InvokeStateMap[II], InvokeEnd);
95
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parents: 83
diff changeset
1229 }
100
7d135dc70f03 LLVM 3.9
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parents: 95
diff changeset
1230
7d135dc70f03 LLVM 3.9
Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
parents: 95
diff changeset
1231 WinEHFuncInfo::WinEHFuncInfo() {}