Mercurial > projects > ldc
annotate gen/passes/GarbageCollect2Stack.cpp @ 1554:d6e8d5db259f
LLVMContext changes up to r77366
| author | Benjamin Kramer <benny.kra@gmail.com> |
|---|---|
| date | Thu, 30 Jul 2009 15:25:10 +0200 |
| parents | f55ca8a1598c |
| children | ed0cffe895ec |
| rev | line source |
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1 //===- GarbageCollect2Stack - Optimize calls to the D garbage collector ---===// |
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2 // |
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3 // The LLVM D Compiler |
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4 // |
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5 // This file is distributed under the University of Illinois Open Source |
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6 // License. See LICENSE.TXT for details. |
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7 // |
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8 //===----------------------------------------------------------------------===// |
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9 // |
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10 // This file attempts to turn allocations on the garbage-collected heap into |
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11 // stack allocations. |
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12 // |
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13 //===----------------------------------------------------------------------===// |
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14 |
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15 #include "gen/metadata.h" |
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16 |
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17 #define DEBUG_TYPE "dgc2stack" |
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18 |
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19 #include "Passes.h" |
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20 |
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21 #include "llvm/Pass.h" |
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22 #include "llvm/Module.h" |
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23 #include "llvm/Constants.h" |
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24 #include "llvm/Intrinsics.h" |
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25 #include "llvm/Support/CallSite.h" |
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26 #include "llvm/Support/CommandLine.h" |
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27 #include "llvm/Support/IRBuilder.h" |
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28 #include "llvm/Analysis/CallGraph.h" |
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29 #include "llvm/Analysis/Dominators.h" |
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30 #include "llvm/Analysis/ValueTracking.h" |
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31 #include "llvm/Target/TargetData.h" |
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32 #include "llvm/ADT/SmallSet.h" |
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33 #include "llvm/ADT/SmallVector.h" |
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34 #include "llvm/ADT/StringMap.h" |
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35 #include "llvm/ADT/Statistic.h" |
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36 #include "llvm/Support/Compiler.h" |
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37 #include "llvm/Support/Debug.h" |
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38 #include "llvm/Support/raw_ostream.h" |
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39 using namespace llvm; |
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40 |
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41 STATISTIC(NumGcToStack, "Number of calls promoted to constant-size allocas"); |
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42 STATISTIC(NumToDynSize, "Number of calls promoted to dynamically-sized allocas"); |
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43 STATISTIC(NumDeleted, "Number of GC calls deleted because the return value was unused"); |
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44 |
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45 |
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46 namespace { |
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47 struct Analysis { |
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48 TargetData& TD; |
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49 const Module& M; |
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50 CallGraph* CG; |
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51 CallGraphNode* CGNode; |
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52 |
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53 const Type* getTypeFor(Value* typeinfo) const; |
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54 }; |
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55 } |
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56 |
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57 //===----------------------------------------------------------------------===// |
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58 // Helper functions |
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59 //===----------------------------------------------------------------------===// |
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60 |
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61 void EmitMemSet(IRBuilder<>& B, Value* Dst, Value* Val, Value* Len, |
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62 const Analysis& A) { |
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63 Dst = B.CreateBitCast(Dst, PointerType::getUnqual(Type::Int8Ty)); |
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64 |
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65 Module *M = B.GetInsertBlock()->getParent()->getParent(); |
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66 const Type* Tys[1]; |
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67 Tys[0] = Len->getType(); |
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68 Function *MemSet = Intrinsic::getDeclaration(M, Intrinsic::memset, Tys, 1); |
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69 Value *Align = ConstantInt::get(Type::Int32Ty, 1); |
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70 |
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71 CallSite CS = B.CreateCall4(MemSet, Dst, Val, Len, Align); |
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72 if (A.CGNode) |
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73 A.CGNode->addCalledFunction(CS, A.CG->getOrInsertFunction(MemSet)); |
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74 } |
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75 |
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76 static void EmitMemZero(IRBuilder<>& B, Value* Dst, Value* Len, |
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77 const Analysis& A) { |
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78 EmitMemSet(B, Dst, ConstantInt::get(Type::Int8Ty, 0), Len, A); |
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79 } |
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80 |
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81 |
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82 //===----------------------------------------------------------------------===// |
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83 // Helpers for specific types of GC calls. |
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84 //===----------------------------------------------------------------------===// |
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85 |
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86 namespace { |
| 1306 | 87 class FunctionInfo { |
| 88 protected: | |
| 89 const Type* Ty; | |
| 90 | |
| 91 public: | |
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92 unsigned TypeInfoArgNr; |
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93 bool SafeToDelete; |
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94 |
| 1306 | 95 // Analyze the current call, filling in some fields. Returns true if |
| 96 // this is an allocation we can stack-allocate. | |
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97 virtual bool analyze(CallSite CS, const Analysis& A) { |
| 1306 | 98 Value* TypeInfo = CS.getArgument(TypeInfoArgNr); |
| 99 Ty = A.getTypeFor(TypeInfo); | |
| 100 return (Ty != NULL); | |
| 101 } | |
| 102 | |
| 103 // Returns the alloca to replace this call. | |
| 104 // It will always be inserted before the call. | |
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105 virtual AllocaInst* promote(CallSite CS, IRBuilder<>& B, const Analysis& A) { |
| 1306 | 106 NumGcToStack++; |
| 107 | |
| 108 Instruction* Begin = CS.getCaller()->getEntryBlock().begin(); | |
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109 return new AllocaInst(Ty, ".nongc_mem", Begin); // FIXME: align? |
| 1306 | 110 } |
| 111 | |
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112 FunctionInfo(unsigned typeInfoArgNr, bool safeToDelete) |
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113 : TypeInfoArgNr(typeInfoArgNr), SafeToDelete(safeToDelete) {} |
| 1306 | 114 }; |
| 115 | |
| 116 class ArrayFI : public FunctionInfo { | |
| 117 Value* arrSize; | |
| 118 int ArrSizeArgNr; | |
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119 bool Initialized; |
| 1306 | 120 |
| 121 public: | |
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122 ArrayFI(unsigned tiArgNr, bool safeToDelete, bool initialized, |
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123 unsigned arrSizeArgNr) |
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124 : FunctionInfo(tiArgNr, safeToDelete), |
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125 ArrSizeArgNr(arrSizeArgNr), |
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126 Initialized(initialized) |
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127 {} |
| 1306 | 128 |
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129 virtual bool analyze(CallSite CS, const Analysis& A) { |
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130 if (!FunctionInfo::analyze(CS, A)) |
| 1306 | 131 return false; |
| 132 | |
| 133 arrSize = CS.getArgument(ArrSizeArgNr); | |
| 134 const IntegerType* SizeType = | |
| 135 dyn_cast<IntegerType>(arrSize->getType()); | |
| 136 if (!SizeType) | |
| 137 return false; | |
| 138 unsigned bits = SizeType->getBitWidth(); | |
| 139 if (bits > 32) { | |
| 140 // The array size of an alloca must be an i32, so make sure | |
| 141 // the conversion is safe. | |
| 142 APInt Mask = APInt::getHighBitsSet(bits, bits - 32); | |
| 143 APInt KnownZero(bits, 0), KnownOne(bits, 0); | |
| 144 ComputeMaskedBits(arrSize, Mask, KnownZero, KnownOne, &A.TD); | |
| 145 if ((KnownZero & Mask) != Mask) | |
| 146 return false; | |
| 147 } | |
| 148 // Extract the element type from the array type. | |
| 149 const StructType* ArrTy = dyn_cast<StructType>(Ty); | |
| 150 assert(ArrTy && "Dynamic array type not a struct?"); | |
| 151 assert(isa<IntegerType>(ArrTy->getElementType(0))); | |
| 152 const PointerType* PtrTy = | |
| 153 cast<PointerType>(ArrTy->getElementType(1)); | |
| 154 Ty = PtrTy->getElementType(); | |
| 155 return true; | |
| 156 } | |
| 157 | |
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158 virtual AllocaInst* promote(CallSite CS, IRBuilder<>& B, const Analysis& A) { |
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159 IRBuilder<> Builder = B; |
| 1306 | 160 // If the allocation is of constant size it's best to put it in the |
| 161 // entry block, so do so if we're not already there. | |
| 162 // For dynamically-sized allocations it's best to avoid the overhead | |
| 163 // of allocating them if possible, so leave those where they are. | |
| 164 // While we're at it, update statistics too. | |
| 165 if (isa<Constant>(arrSize)) { | |
| 166 BasicBlock& Entry = CS.getCaller()->getEntryBlock(); | |
| 167 if (Builder.GetInsertBlock() != &Entry) | |
| 168 Builder.SetInsertPoint(&Entry, Entry.begin()); | |
| 169 NumGcToStack++; | |
| 170 } else { | |
| 171 NumToDynSize++; | |
| 172 } | |
| 173 | |
| 174 // Convert array size to 32 bits if necessary | |
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175 Value* count = Builder.CreateIntCast(arrSize, Type::Int32Ty, false); |
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176 AllocaInst* alloca = Builder.CreateAlloca(Ty, count, ".nongc_mem"); // FIXME: align? |
| 1306 | 177 |
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178 if (Initialized) { |
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179 // For now, only zero-init is supported. |
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180 uint64_t size = A.TD.getTypeStoreSize(Ty); |
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181 Value* TypeSize = ConstantInt::get(arrSize->getType(), size); |
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182 // Use the original B to put initialization at the |
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183 // allocation site. |
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184 Value* Size = B.CreateMul(TypeSize, arrSize); |
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185 EmitMemZero(B, alloca, Size, A); |
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186 } |
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187 |
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188 return alloca; |
| 1306 | 189 } |
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190 }; |
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191 |
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192 // FunctionInfo for _d_allocclass |
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193 class AllocClassFI : public FunctionInfo { |
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194 public: |
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195 virtual bool analyze(CallSite CS, const Analysis& A) { |
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196 // This call contains no TypeInfo parameter, so don't call the |
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197 // base class implementation here... |
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198 if (CS.arg_size() != 1) |
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199 return false; |
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200 Value* arg = CS.getArgument(0)->stripPointerCasts(); |
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201 GlobalVariable* ClassInfo = dyn_cast<GlobalVariable>(arg); |
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202 if (!ClassInfo) |
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203 return false; |
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204 |
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205 std::string metaname = CD_PREFIX; |
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206 metaname += ClassInfo->getName(); |
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207 |
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208 GlobalVariable* global = A.M.getGlobalVariable(metaname); |
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209 if (!global || !global->hasInitializer()) |
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210 return false; |
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211 |
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212 MDNode* node = dyn_cast<MDNode>(global->getInitializer()); |
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213 if (!node || MD_GetNumElements(node) != CD_NumFields) |
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214 return false; |
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215 |
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216 // Inserting destructor calls is not implemented yet, so classes |
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217 // with destructors are ignored for now. |
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218 Constant* hasDestructor = dyn_cast<Constant>(MD_GetElement(node, CD_Finalize)); |
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219 // We can't stack-allocate if the class has a custom deallocator |
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220 // (Custom allocators don't get turned into this runtime call, so |
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221 // those can be ignored) |
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222 Constant* hasCustomDelete = dyn_cast<Constant>(MD_GetElement(node, CD_CustomDelete)); |
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223 if (hasDestructor == NULL || hasCustomDelete == NULL) |
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224 return false; |
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225 |
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226 if (ConstantExpr::getOr(hasDestructor, hasCustomDelete) |
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227 != A.M.getContext().getFalse()) |
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228 return false; |
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229 |
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230 Ty = MD_GetElement(node, CD_BodyType)->getType(); |
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231 return true; |
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232 } |
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233 |
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234 // The default promote() should be fine. |
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235 |
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236 AllocClassFI() : FunctionInfo(~0u, true) {} |
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237 }; |
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238 } |
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239 |
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240 |
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241 //===----------------------------------------------------------------------===// |
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242 // GarbageCollect2Stack Pass Implementation |
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243 //===----------------------------------------------------------------------===// |
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244 |
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245 namespace { |
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246 /// This pass replaces GC calls with alloca's |
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247 /// |
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248 class VISIBILITY_HIDDEN GarbageCollect2Stack : public FunctionPass { |
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249 StringMap<FunctionInfo*> KnownFunctions; |
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250 Module* M; |
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251 |
| 1306 | 252 FunctionInfo AllocMemoryT; |
| 253 ArrayFI NewArrayVT; | |
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254 ArrayFI NewArrayT; |
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255 AllocClassFI AllocClass; |
| 1306 | 256 |
| 257 public: | |
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258 static char ID; // Pass identification |
| 1306 | 259 GarbageCollect2Stack(); |
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260 |
| 1306 | 261 bool doInitialization(Module &M) { |
| 262 this->M = &M; | |
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263 return false; |
| 1306 | 264 } |
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265 |
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266 bool runOnFunction(Function &F); |
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267 |
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268 virtual void getAnalysisUsage(AnalysisUsage &AU) const { |
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269 AU.addRequired<TargetData>(); |
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270 AU.addRequired<DominatorTree>(); |
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271 |
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272 AU.addPreserved<CallGraph>(); |
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273 AU.addPreserved<DominatorTree>(); |
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274 } |
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275 }; |
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276 char GarbageCollect2Stack::ID = 0; |
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277 } // end anonymous namespace. |
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278 |
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279 static RegisterPass<GarbageCollect2Stack> |
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280 X("dgc2stack", "Promote (GC'ed) heap allocations to stack"); |
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281 |
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282 // Public interface to the pass. |
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283 FunctionPass *createGarbageCollect2Stack() { |
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284 return new GarbageCollect2Stack(); |
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285 } |
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286 |
| 1306 | 287 GarbageCollect2Stack::GarbageCollect2Stack() |
| 288 : FunctionPass(&ID), | |
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289 AllocMemoryT(0, true), |
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290 NewArrayVT(0, true, false, 1), |
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291 NewArrayT(0, true, true, 1) |
| 1306 | 292 { |
| 293 KnownFunctions["_d_allocmemoryT"] = &AllocMemoryT; | |
| 294 KnownFunctions["_d_newarrayvT"] = &NewArrayVT; | |
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295 KnownFunctions["_d_newarrayT"] = &NewArrayT; |
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296 KnownFunctions["_d_allocclass"] = &AllocClass; |
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297 } |
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298 |
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299 static void RemoveCall(CallSite CS, const Analysis& A) { |
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300 if (CS.isInvoke()) { |
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301 InvokeInst* Invoke = cast<InvokeInst>(CS.getInstruction()); |
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302 // If this was an invoke instruction, we need to do some extra |
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303 // work to preserve the control flow. |
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304 |
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305 // Create a "conditional" branch that -simplifycfg can clean up, so we |
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306 // can keep using the DominatorTree without updating it. |
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307 BranchInst::Create(Invoke->getNormalDest(), Invoke->getUnwindDest(), |
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308 A.M.getContext().getTrue(), Invoke->getParent()); |
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309 } |
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310 // Remove the runtime call. |
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311 if (A.CGNode) |
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312 A.CGNode->removeCallEdgeFor(CS); |
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313 CS.getInstruction()->eraseFromParent(); |
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314 } |
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315 |
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316 static bool isSafeToStackAllocate(Instruction* Alloc, DominatorTree& DT); |
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317 |
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318 /// runOnFunction - Top level algorithm. |
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319 /// |
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320 bool GarbageCollect2Stack::runOnFunction(Function &F) { |
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321 DEBUG(errs() << "\nRunning -dgc2stack on function " << F.getName() << '\n'); |
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322 |
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323 TargetData& TD = getAnalysis<TargetData>(); |
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324 DominatorTree& DT = getAnalysis<DominatorTree>(); |
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325 CallGraph* CG = getAnalysisIfAvailable<CallGraph>(); |
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326 CallGraphNode* CGNode = CG ? (*CG)[&F] : NULL; |
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327 |
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328 Analysis A = { TD, *M, CG, CGNode }; |
| 1306 | 329 |
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330 BasicBlock& Entry = F.getEntryBlock(); |
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331 |
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332 IRBuilder<> AllocaBuilder(&Entry, Entry.begin()); |
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333 |
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334 bool Changed = false; |
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335 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) { |
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336 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) { |
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337 // Ignore non-calls. |
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338 Instruction* Inst = I++; |
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339 CallSite CS = CallSite::get(Inst); |
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340 if (!CS.getInstruction()) |
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341 continue; |
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342 |
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343 // Ignore indirect calls and calls to non-external functions. |
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344 Function *Callee = CS.getCalledFunction(); |
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345 if (Callee == 0 || !Callee->isDeclaration() || |
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346 !(Callee->hasExternalLinkage() || Callee->hasDLLImportLinkage())) |
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347 continue; |
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348 |
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349 // Ignore unknown calls. |
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350 StringMap<FunctionInfo*>::iterator OMI = |
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351 KnownFunctions.find(Callee->getName()); |
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352 if (OMI == KnownFunctions.end()) continue; |
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353 |
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354 assert(isa<PointerType>(Inst->getType()) |
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355 && "GC function doesn't return a pointer?"); |
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356 |
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357 FunctionInfo* info = OMI->getValue(); |
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358 |
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359 if (Inst->use_empty() && info->SafeToDelete) { |
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360 Changed = true; |
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361 NumDeleted++; |
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362 RemoveCall(CS, A); |
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363 continue; |
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364 } |
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365 |
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366 DEBUG(errs() << "GarbageCollect2Stack inspecting: " << *Inst); |
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367 |
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368 if (!info->analyze(CS, A) || !isSafeToStackAllocate(Inst, DT)) |
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369 continue; |
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370 |
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371 // Let's alloca this! |
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372 Changed = true; |
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373 |
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374 IRBuilder<> Builder(BB, Inst); |
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375 Value* newVal = info->promote(CS, Builder, A); |
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376 |
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377 DEBUG(errs() << "Promoted to: " << *newVal); |
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378 |
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379 // Make sure the type is the same as it was before, and replace all |
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380 // uses of the runtime call with the alloca. |
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381 if (newVal->getType() != Inst->getType()) |
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382 newVal = Builder.CreateBitCast(newVal, Inst->getType()); |
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383 Inst->replaceAllUsesWith(newVal); |
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384 |
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385 RemoveCall(CS, A); |
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386 } |
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387 } |
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388 |
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389 return Changed; |
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390 } |
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391 |
| 1306 | 392 const Type* Analysis::getTypeFor(Value* typeinfo) const { |
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393 GlobalVariable* ti_global = dyn_cast<GlobalVariable>(typeinfo->stripPointerCasts()); |
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394 if (!ti_global) |
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395 return NULL; |
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396 |
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397 std::string metaname = TD_PREFIX; |
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398 metaname += ti_global->getName(); |
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399 |
| 1306 | 400 GlobalVariable* global = M.getGlobalVariable(metaname); |
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401 if (!global || !global->hasInitializer()) |
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402 return NULL; |
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403 |
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404 MDNode* node = dyn_cast<MDNode>(global->getInitializer()); |
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405 if (!node) |
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406 return NULL; |
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407 |
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408 if (MD_GetNumElements(node) != TD_NumFields) |
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409 return NULL; |
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410 if (TD_Confirm >= 0 && (!MD_GetElement(node, TD_Confirm) || |
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411 MD_GetElement(node, TD_Confirm)->stripPointerCasts() != ti_global)) |
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412 return NULL; |
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413 |
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414 return MD_GetElement(node, TD_Type)->getType(); |
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415 } |
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416 |
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417 /// Returns whether Def is used by any instruction that is reachable from Alloc |
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418 /// (without executing Def again). |
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419 static bool mayBeUsedAfterRealloc(Instruction* Def, Instruction* Alloc, DominatorTree& DT) { |
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420 DEBUG(errs() << "### mayBeUsedAfterRealloc()\n" << *Def << *Alloc); |
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421 |
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422 // If the definition isn't used it obviously won't be used after the |
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423 // allocation. |
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424 // If it does not dominate the allocation, there's no way for it to be used |
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425 // without going through Def again first, since the definition couldn't |
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426 // dominate the user either. |
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427 if (Def->use_empty() || !DT.dominates(Def, Alloc)) { |
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428 DEBUG(errs() << "### No uses or does not dominate allocation\n"); |
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429 return false; |
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430 } |
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431 |
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432 DEBUG(errs() << "### Def dominates Alloc\n"); |
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433 |
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434 BasicBlock* DefBlock = Def->getParent(); |
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435 BasicBlock* AllocBlock = Alloc->getParent(); |
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436 |
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437 // Create a set of users and one of blocks containing users. |
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438 SmallSet<User*, 16> Users; |
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439 SmallSet<BasicBlock*, 16> UserBlocks; |
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440 for (Instruction::use_iterator UI = Def->use_begin(), UE = Def->use_end(); |
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441 UI != UE; ++UI) { |
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442 Instruction* User = cast<Instruction>(*UI); |
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443 DEBUG(errs() << "USER: " << *User); |
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444 BasicBlock* UserBlock = User->getParent(); |
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445 |
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446 // This dominance check is not performed if they're in the same block |
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447 // because it will just walk the instruction list to figure it out. |
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448 // We will instead do that ourselves in the first iteration (for all |
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449 // users at once). |
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450 if (AllocBlock != UserBlock && DT.dominates(AllocBlock, UserBlock)) { |
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451 // There's definitely a path from alloc to this user that does not |
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452 // go through Def, namely any path that ends up in that user. |
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453 DEBUG(errs() << "### Alloc dominates user " << *User); |
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454 return true; |
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455 } |
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456 |
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457 // Phi nodes are checked separately, so no need to enter them here. |
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458 if (!isa<PHINode>(User)) { |
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459 Users.insert(User); |
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460 UserBlocks.insert(UserBlock); |
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461 } |
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462 } |
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463 |
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464 // Contains first instruction of block to inspect. |
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465 typedef std::pair<BasicBlock*, BasicBlock::iterator> StartPoint; |
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466 SmallVector<StartPoint, 16> Worklist; |
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467 // Keeps track of successors that have been added to the work list. |
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468 SmallSet<BasicBlock*, 16> Visited; |
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469 |
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470 // Start just after the allocation. |
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471 // Note that we don't insert AllocBlock into the Visited set here so the |
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472 // start of the block will get inspected if it's reachable. |
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473 BasicBlock::iterator Start = Alloc; |
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474 ++Start; |
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475 Worklist.push_back(StartPoint(AllocBlock, Start)); |
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476 |
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477 while (!Worklist.empty()) { |
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478 StartPoint sp = Worklist.pop_back_val(); |
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479 BasicBlock* B = sp.first; |
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480 BasicBlock::iterator BBI = sp.second; |
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481 // BBI is either just after the allocation (in the first iteration) |
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482 // or just after the last phi node in B (in subsequent iterations) here. |
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483 |
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484 // This whole 'if' is just a way to avoid performing the inner 'for' |
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485 // loop when it can be determined not to be necessary, avoiding |
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486 // potentially expensive walks of the instruction list. |
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487 // It should be equivalent to just doing the loop. |
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488 if (UserBlocks.count(B)) { |
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489 if (B != DefBlock && B != AllocBlock) { |
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490 // This block does not contain the definition or the allocation, |
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491 // so any user in this block is definitely reachable without |
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492 // finding either the definition or the allocation. |
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493 DEBUG(errs() << "### Block " << B->getName() |
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494 << " contains a reachable user\n"); |
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495 return true; |
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496 } |
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497 // We need to walk the instructions in the block to see whether we |
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498 // reach a user before we reach the definition or the allocation. |
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499 for (BasicBlock::iterator E = B->end(); BBI != E; ++BBI) { |
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500 if (&*BBI == Alloc || &*BBI == Def) |
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501 break; |
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502 if (Users.count(BBI)) { |
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503 DEBUG(errs() << "### Problematic user: " << *BBI); |
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504 return true; |
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505 } |
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506 } |
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507 } else if (B == DefBlock || (B == AllocBlock && BBI != Start)) { |
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508 // There are no users in the block so the def or the allocation |
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509 // will be encountered before any users though this path. |
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510 // Skip to the next item on the worklist. |
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511 continue; |
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512 } else { |
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513 // No users and no definition or allocation after the start point, |
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514 // so just keep going. |
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515 } |
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516 |
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517 // All instructions after the starting point in this block have been |
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518 // accounted for. Look for successors to add to the work list. |
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519 TerminatorInst* Term = B->getTerminator(); |
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520 unsigned SuccCount = Term->getNumSuccessors(); |
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521 for (unsigned i = 0; i < SuccCount; i++) { |
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522 BasicBlock* Succ = Term->getSuccessor(i); |
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523 BBI = Succ->begin(); |
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524 // Check phi nodes here because we only care about the operand |
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525 // coming in from this block. |
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526 bool SeenDef = false; |
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527 while (isa<PHINode>(BBI)) { |
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528 if (Def == cast<PHINode>(BBI)->getIncomingValueForBlock(B)) { |
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529 DEBUG(errs() << "### Problematic phi user: " << *BBI); |
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530 return true; |
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531 } |
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532 SeenDef |= (Def == &*BBI); |
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533 ++BBI; |
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534 } |
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535 // If none of the phis we just looked at were the definition, we |
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536 // haven't seen this block yet, and it's dominated by the def |
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537 // (meaning paths through it could lead to users), add the block and |
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538 // the first non-phi to the worklist. |
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539 if (!SeenDef && Visited.insert(Succ) && DT.dominates(DefBlock, Succ)) |
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540 Worklist.push_back(StartPoint(Succ, BBI)); |
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541 } |
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542 } |
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543 // No users found in any block reachable from Alloc |
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544 // without going through the definition again. |
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545 return false; |
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546 } |
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547 |
|
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548 |
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549 /// isSafeToStackAllocate - Return true if the GC call passed in is safe to turn |
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550 /// into a stack allocation. This requires that the return value does not |
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551 /// escape from the function and no derived pointers are live at the call site |
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552 /// (i.e. if it's in a loop then the function can't use any pointer returned |
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553 /// from an earlier call after a new call has been made) |
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554 /// |
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555 /// This is currently conservative where loops are involved: it can handle |
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556 /// simple loops, but returns false if any derived pointer is used in a |
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557 /// subsequent iteration. |
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558 /// |
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559 /// Based on LLVM's PointerMayBeCaptured(), which only does escape analysis but |
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560 /// doesn't care about loops. |
|
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561 bool isSafeToStackAllocate(Instruction* Alloc, DominatorTree& DT) { |
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562 assert(isa<PointerType>(Alloc->getType()) && "Allocation is not a pointer?"); |
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563 Value* V = Alloc; |
|
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|
564 |
|
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565 SmallVector<Use*, 16> Worklist; |
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566 SmallSet<Use*, 16> Visited; |
|
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|
567 |
|
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568 for (Value::use_iterator UI = V->use_begin(), UE = V->use_end(); |
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|
569 UI != UE; ++UI) { |
|
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570 Use *U = &UI.getUse(); |
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571 Visited.insert(U); |
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|
572 Worklist.push_back(U); |
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573 } |
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574 |
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575 while (!Worklist.empty()) { |
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576 Use *U = Worklist.pop_back_val(); |
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577 Instruction *I = cast<Instruction>(U->getUser()); |
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578 V = U->get(); |
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579 |
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580 switch (I->getOpcode()) { |
|
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|
581 case Instruction::Call: |
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582 case Instruction::Invoke: { |
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583 CallSite CS = CallSite::get(I); |
|
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584 // Not captured if the callee is readonly, doesn't return a copy through |
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585 // its return value and doesn't unwind (a readonly function can leak bits |
|
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586 // by throwing an exception or not depending on the input value). |
|
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587 if (CS.onlyReadsMemory() && CS.doesNotThrow() && |
|
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588 I->getType() == Type::VoidTy) |
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589 break; |
|
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|
590 |
|
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591 // Not captured if only passed via 'nocapture' arguments. Note that |
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592 // calling a function pointer does not in itself cause the pointer to |
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593 // be captured. This is a subtle point considering that (for example) |
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594 // the callee might return its own address. It is analogous to saying |
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595 // that loading a value from a pointer does not cause the pointer to be |
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596 // captured, even though the loaded value might be the pointer itself |
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597 // (think of self-referential objects). |
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598 CallSite::arg_iterator B = CS.arg_begin(), E = CS.arg_end(); |
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599 for (CallSite::arg_iterator A = B; A != E; ++A) |
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600 if (A->get() == V && !CS.paramHasAttr(A - B + 1, Attribute::NoCapture)) |
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601 // The parameter is not marked 'nocapture' - captured. |
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602 return false; |
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603 // Only passed via 'nocapture' arguments, or is the called function - not |
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604 // captured. |
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605 break; |
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606 } |
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607 case Instruction::Free: |
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608 // Freeing a pointer does not cause it to be captured. |
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609 break; |
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610 case Instruction::Load: |
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611 // Loading from a pointer does not cause it to be captured. |
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612 break; |
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613 case Instruction::Store: |
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614 if (V == I->getOperand(0)) |
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615 // Stored the pointer - it may be captured. |
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616 return false; |
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617 // Storing to the pointee does not cause the pointer to be captured. |
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618 break; |
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619 case Instruction::BitCast: |
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620 case Instruction::GetElementPtr: |
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621 case Instruction::PHI: |
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622 case Instruction::Select: |
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623 // It's not safe to stack-allocate if this derived pointer is live across |
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624 // the original allocation. |
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625 if (mayBeUsedAfterRealloc(I, Alloc, DT)) |
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626 return false; |
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627 |
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628 // The original value is not captured via this if the new value isn't. |
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629 for (Instruction::use_iterator UI = I->use_begin(), UE = I->use_end(); |
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630 UI != UE; ++UI) { |
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631 Use *U = &UI.getUse(); |
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632 if (Visited.insert(U)) |
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633 Worklist.push_back(U); |
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634 } |
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635 break; |
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636 default: |
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637 // Something else - be conservative and say it is captured. |
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638 return false; |
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639 } |
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640 } |
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641 |
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642 // All uses examined - not captured or live across original allocation. |
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643 return true; |
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644 } |