Mercurial > projects > ldc
annotate gen/passes/GarbageCollect2Stack.cpp @ 1548:a326f145a57b
ConstantInt::get{True,False} moved to LLVMContext
Non-breaking build fix for LLVM r76533. Also fixes a context related
bug in GarbageCollect2Stack.
author | Benjamin Kramer <benny.kra@gmail.com> |
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date | Tue, 21 Jul 2009 13:11:39 +0200 |
parents | 7fcb72d518f6 |
children | ed0feda76820 |
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 using namespace llvm; |
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39 |
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40 STATISTIC(NumGcToStack, "Number of calls promoted to constant-size allocas"); |
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41 STATISTIC(NumToDynSize, "Number of calls promoted to dynamically-sized allocas"); |
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42 STATISTIC(NumDeleted, "Number of GC calls deleted because the return value was unused"); |
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43 |
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44 |
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45 namespace { |
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46 struct Analysis { |
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47 TargetData& TD; |
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48 const Module& M; |
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49 CallGraph* CG; |
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50 CallGraphNode* CGNode; |
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51 |
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52 const Type* getTypeFor(Value* typeinfo) const; |
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53 }; |
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54 } |
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55 |
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56 //===----------------------------------------------------------------------===// |
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57 // Helper functions |
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58 //===----------------------------------------------------------------------===// |
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59 |
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60 void EmitMemSet(LLVMContext& Context, IRBuilder<>& B, Value* Dst, Value* Val, |
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61 Value* Len, const Analysis& A) { |
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62 Dst = B.CreateBitCast(Dst, PointerType::getUnqual(Type::Int8Ty)); |
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63 |
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64 Module *M = B.GetInsertBlock()->getParent()->getParent(); |
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65 const Type* Tys[1]; |
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66 Tys[0] = Len->getType(); |
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67 Function *MemSet = Intrinsic::getDeclaration(M, Intrinsic::memset, Tys, 1); |
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68 Value *Align = Context.getConstantInt(Type::Int32Ty, 1); |
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69 |
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70 CallSite CS = B.CreateCall4(MemSet, Dst, Val, Len, Align); |
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71 if (A.CGNode) |
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72 A.CGNode->addCalledFunction(CS, A.CG->getOrInsertFunction(MemSet)); |
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73 } |
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74 |
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75 static void EmitMemZero(LLVMContext& Context, IRBuilder<>& B, Value* Dst, |
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76 Value* Len, const Analysis& A) { |
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77 EmitMemSet(Context, B, Dst, Context.getConstantInt(Type::Int8Ty, 0), Len, A); |
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78 } |
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79 |
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80 |
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81 //===----------------------------------------------------------------------===// |
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82 // Helpers for specific types of GC calls. |
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83 //===----------------------------------------------------------------------===// |
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84 |
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85 namespace { |
1306 | 86 class FunctionInfo { |
87 protected: | |
88 const Type* Ty; | |
89 | |
90 public: | |
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91 unsigned TypeInfoArgNr; |
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92 bool SafeToDelete; |
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93 |
1306 | 94 // Analyze the current call, filling in some fields. Returns true if |
95 // this is an allocation we can stack-allocate. | |
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96 virtual bool analyze(LLVMContext& context, CallSite CS, const Analysis& A) { |
1306 | 97 Value* TypeInfo = CS.getArgument(TypeInfoArgNr); |
98 Ty = A.getTypeFor(TypeInfo); | |
99 return (Ty != NULL); | |
100 } | |
101 | |
102 // Returns the alloca to replace this call. | |
103 // It will always be inserted before the call. | |
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104 virtual AllocaInst* promote(LLVMContext& context, CallSite CS, IRBuilder<>& B, const Analysis& A) { |
1306 | 105 NumGcToStack++; |
106 | |
107 Instruction* Begin = CS.getCaller()->getEntryBlock().begin(); | |
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108 return new AllocaInst(Ty, ".nongc_mem", Begin); // FIXME: align? |
1306 | 109 } |
110 | |
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111 FunctionInfo(unsigned typeInfoArgNr, bool safeToDelete) |
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112 : TypeInfoArgNr(typeInfoArgNr), SafeToDelete(safeToDelete) {} |
1306 | 113 }; |
114 | |
115 class ArrayFI : public FunctionInfo { | |
116 Value* arrSize; | |
117 int ArrSizeArgNr; | |
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118 bool Initialized; |
1306 | 119 |
120 public: | |
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121 ArrayFI(unsigned tiArgNr, bool safeToDelete, |
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122 bool initialized, unsigned arrSizeArgNr) |
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123 : FunctionInfo(tiArgNr, safeToDelete), |
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124 ArrSizeArgNr(arrSizeArgNr), |
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125 Initialized(initialized) |
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126 {} |
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128 virtual bool analyze(LLVMContext& context, CallSite CS, const Analysis& A) { |
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129 if (!FunctionInfo::analyze(context, CS, A)) |
1306 | 130 return false; |
131 | |
132 arrSize = CS.getArgument(ArrSizeArgNr); | |
133 const IntegerType* SizeType = | |
134 dyn_cast<IntegerType>(arrSize->getType()); | |
135 if (!SizeType) | |
136 return false; | |
137 unsigned bits = SizeType->getBitWidth(); | |
138 if (bits > 32) { | |
139 // The array size of an alloca must be an i32, so make sure | |
140 // the conversion is safe. | |
141 APInt Mask = APInt::getHighBitsSet(bits, bits - 32); | |
142 APInt KnownZero(bits, 0), KnownOne(bits, 0); | |
143 ComputeMaskedBits(arrSize, Mask, KnownZero, KnownOne, &A.TD); | |
144 if ((KnownZero & Mask) != Mask) | |
145 return false; | |
146 } | |
147 // Extract the element type from the array type. | |
148 const StructType* ArrTy = dyn_cast<StructType>(Ty); | |
149 assert(ArrTy && "Dynamic array type not a struct?"); | |
150 assert(isa<IntegerType>(ArrTy->getElementType(0))); | |
151 const PointerType* PtrTy = | |
152 cast<PointerType>(ArrTy->getElementType(1)); | |
153 Ty = PtrTy->getElementType(); | |
154 return true; | |
155 } | |
156 | |
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157 virtual AllocaInst* promote(LLVMContext& context, CallSite CS, IRBuilder<>& B, const Analysis& A) { |
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158 IRBuilder<> Builder = B; |
1306 | 159 // If the allocation is of constant size it's best to put it in the |
160 // entry block, so do so if we're not already there. | |
161 // For dynamically-sized allocations it's best to avoid the overhead | |
162 // of allocating them if possible, so leave those where they are. | |
163 // While we're at it, update statistics too. | |
164 if (isa<Constant>(arrSize)) { | |
165 BasicBlock& Entry = CS.getCaller()->getEntryBlock(); | |
166 if (Builder.GetInsertBlock() != &Entry) | |
167 Builder.SetInsertPoint(&Entry, Entry.begin()); | |
168 NumGcToStack++; | |
169 } else { | |
170 NumToDynSize++; | |
171 } | |
172 | |
173 // Convert array size to 32 bits if necessary | |
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174 Value* count = Builder.CreateIntCast(arrSize, Type::Int32Ty, false); |
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175 AllocaInst* alloca = Builder.CreateAlloca(Ty, count, ".nongc_mem"); // FIXME: align? |
1306 | 176 |
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177 if (Initialized) { |
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178 // For now, only zero-init is supported. |
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179 uint64_t size = A.TD.getTypeStoreSize(Ty); |
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180 Value* TypeSize = context.getConstantInt(arrSize->getType(), size); |
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181 // Use the original B to put initialization at the |
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182 // allocation site. |
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183 Value* Size = B.CreateMul(TypeSize, arrSize); |
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184 EmitMemZero(context, B, alloca, Size, A); |
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185 } |
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186 |
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187 return alloca; |
1306 | 188 } |
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189 }; |
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190 |
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191 // FunctionInfo for _d_allocclass |
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192 class AllocClassFI : public FunctionInfo { |
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193 public: |
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194 virtual bool analyze(LLVMContext& context, CallSite CS, const Analysis& A) { |
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195 // This call contains no TypeInfo parameter, so don't call the |
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196 // base class implementation here... |
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197 if (CS.arg_size() != 1) |
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198 return false; |
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199 Value* arg = CS.getArgument(0)->stripPointerCasts(); |
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200 GlobalVariable* ClassInfo = dyn_cast<GlobalVariable>(arg); |
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201 if (!ClassInfo) |
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202 return false; |
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203 |
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204 std::string metaname = CD_PREFIX; |
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205 metaname.append(ClassInfo->getNameStart(), ClassInfo->getNameEnd()); |
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206 |
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207 GlobalVariable* global = A.M.getGlobalVariable(metaname); |
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208 if (!global || !global->hasInitializer()) |
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209 return false; |
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210 |
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211 MDNode* node = dyn_cast<MDNode>(global->getInitializer()); |
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212 if (!node || MD_GetNumElements(node) != CD_NumFields) |
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213 return false; |
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214 |
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215 // Inserting destructor calls is not implemented yet, so classes |
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216 // with destructors are ignored for now. |
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217 Constant* hasDestructor = dyn_cast<Constant>(MD_GetElement(node, CD_Finalize)); |
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218 // We can't stack-allocate if the class has a custom deallocator |
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219 // (Custom allocators don't get turned into this runtime call, so |
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220 // those can be ignored) |
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221 Constant* hasCustomDelete = dyn_cast<Constant>(MD_GetElement(node, CD_CustomDelete)); |
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222 if (hasDestructor == NULL || hasCustomDelete == NULL) |
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223 return false; |
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224 |
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225 if (context.getConstantExprOr(hasDestructor, hasCustomDelete) |
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226 != context.getConstantIntFalse()) |
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227 return false; |
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228 |
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229 Ty = MD_GetElement(node, CD_BodyType)->getType(); |
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230 return true; |
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231 } |
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232 |
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233 // The default promote() should be fine. |
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234 |
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235 AllocClassFI() : FunctionInfo(~0u, true) {} |
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236 }; |
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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 // GarbageCollect2Stack Pass Implementation |
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242 //===----------------------------------------------------------------------===// |
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243 |
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244 namespace { |
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245 /// This pass replaces GC calls with alloca's |
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246 /// |
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247 class VISIBILITY_HIDDEN GarbageCollect2Stack : public FunctionPass { |
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248 StringMap<FunctionInfo*> KnownFunctions; |
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249 Module* M; |
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250 |
1306 | 251 FunctionInfo AllocMemoryT; |
252 ArrayFI NewArrayVT; | |
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253 ArrayFI NewArrayT; |
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254 AllocClassFI AllocClass; |
1306 | 255 |
256 public: | |
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257 static char ID; // Pass identification |
1306 | 258 GarbageCollect2Stack(); |
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259 |
1306 | 260 bool doInitialization(Module &M) { |
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261 Context = &M.getContext(); |
1306 | 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(LLVMContext& context, 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 context.getConstantIntTrue(), 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(DOUT << "\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 const char *CalleeName = Callee->getNameStart(); |
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351 StringMap<FunctionInfo*>::iterator OMI = |
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352 KnownFunctions.find(CalleeName, CalleeName+Callee->getNameLen()); |
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353 if (OMI == KnownFunctions.end()) continue; |
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354 |
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355 assert(isa<PointerType>(Inst->getType()) |
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356 && "GC function doesn't return a pointer?"); |
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357 |
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358 FunctionInfo* info = OMI->getValue(); |
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359 |
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360 if (Inst->use_empty() && info->SafeToDelete) { |
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361 Changed = true; |
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362 NumDeleted++; |
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363 RemoveCall(*Context, CS, A); |
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364 continue; |
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365 } |
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366 |
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367 DEBUG(DOUT << "GarbageCollect2Stack inspecting: " << *Inst); |
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368 |
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369 if (!info->analyze(*Context, CS, A) || !isSafeToStackAllocate(Inst, DT)) |
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370 continue; |
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371 |
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372 // Let's alloca this! |
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373 Changed = true; |
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374 |
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375 IRBuilder<> Builder(BB, Inst); |
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376 Value* newVal = info->promote(*Context, CS, Builder, A); |
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377 |
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378 DEBUG(DOUT << "Promoted to: " << *newVal); |
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379 |
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380 // Make sure the type is the same as it was before, and replace all |
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381 // uses of the runtime call with the alloca. |
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382 if (newVal->getType() != Inst->getType()) |
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383 newVal = Builder.CreateBitCast(newVal, Inst->getType()); |
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384 Inst->replaceAllUsesWith(newVal); |
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385 |
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386 RemoveCall(*Context, CS, A); |
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387 } |
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388 } |
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389 |
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390 return Changed; |
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391 } |
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392 |
1306 | 393 const Type* Analysis::getTypeFor(Value* typeinfo) const { |
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394 GlobalVariable* ti_global = dyn_cast<GlobalVariable>(typeinfo->stripPointerCasts()); |
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395 if (!ti_global) |
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396 return NULL; |
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397 |
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398 std::string metaname = TD_PREFIX; |
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399 metaname.append(ti_global->getNameStart(), ti_global->getNameEnd()); |
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400 |
1306 | 401 GlobalVariable* global = M.getGlobalVariable(metaname); |
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402 if (!global || !global->hasInitializer()) |
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403 return NULL; |
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404 |
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405 MDNode* node = dyn_cast<MDNode>(global->getInitializer()); |
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406 if (!node) |
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407 return NULL; |
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408 |
1344
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409 if (MD_GetNumElements(node) != TD_NumFields) |
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410 return NULL; |
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411 if (TD_Confirm >= 0 && (!MD_GetElement(node, TD_Confirm) || |
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412 MD_GetElement(node, TD_Confirm)->stripPointerCasts() != ti_global)) |
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413 return NULL; |
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414 |
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415 return MD_GetElement(node, TD_Type)->getType(); |
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416 } |
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417 |
1491
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418 /// Returns whether Def is used by any instruction that is reachable from Alloc |
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419 /// (without executing Def again). |
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420 static bool mayBeUsedAfterRealloc(Instruction* Def, Instruction* Alloc, DominatorTree& DT) { |
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421 DOUT << "### mayBeUsedAfterRealloc()\n" << *Def << *Alloc; |
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422 |
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423 // If the definition isn't used it obviously won't be used after the |
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424 // allocation. |
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425 // If it does not dominate the allocation, there's no way for it to be used |
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426 // without going through Def again first, since the definition couldn't |
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427 // dominate the user either. |
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428 if (Def->use_empty() || !DT.dominates(Def, Alloc)) { |
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429 DOUT << "### No uses or does not dominate allocation\n"; |
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430 return false; |
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431 } |
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432 |
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433 DOUT << "### Def dominates Alloc\n"; |
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434 |
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435 BasicBlock* DefBlock = Def->getParent(); |
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436 BasicBlock* AllocBlock = Alloc->getParent(); |
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437 |
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438 // Create a set of users and one of blocks containing users. |
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439 SmallSet<User*, 16> Users; |
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440 SmallSet<BasicBlock*, 16> UserBlocks; |
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441 for (Instruction::use_iterator UI = Def->use_begin(), UE = Def->use_end(); |
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442 UI != UE; ++UI) { |
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443 Instruction* User = cast<Instruction>(*UI); |
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444 DOUT << "USER: " << *User; |
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445 BasicBlock* UserBlock = User->getParent(); |
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446 |
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447 // This dominance check is not performed if they're in the same block |
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448 // because it will just walk the instruction list to figure it out. |
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449 // We will instead do that ourselves in the first iteration (for all |
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450 // users at once). |
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451 if (AllocBlock != UserBlock && DT.dominates(AllocBlock, UserBlock)) { |
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452 // There's definitely a path from alloc to this user that does not |
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453 // go through Def, namely any path that ends up in that user. |
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454 DOUT << "### Alloc dominates user " << *User; |
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455 return true; |
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456 } |
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457 |
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458 // Phi nodes are checked separately, so no need to enter them here. |
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459 if (!isa<PHINode>(User)) { |
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460 Users.insert(User); |
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461 UserBlocks.insert(UserBlock); |
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462 } |
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463 } |
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464 |
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465 // Contains first instruction of block to inspect. |
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466 typedef std::pair<BasicBlock*, BasicBlock::iterator> StartPoint; |
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467 SmallVector<StartPoint, 16> Worklist; |
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468 // Keeps track of successors that have been added to the work list. |
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469 SmallSet<BasicBlock*, 16> Visited; |
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470 |
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471 // Start just after the allocation. |
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472 // Note that we don't insert AllocBlock into the Visited set here so the |
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473 // start of the block will get inspected if it's reachable. |
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474 BasicBlock::iterator Start = Alloc; |
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475 ++Start; |
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476 Worklist.push_back(StartPoint(AllocBlock, Start)); |
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477 |
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478 while (!Worklist.empty()) { |
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479 StartPoint sp = Worklist.pop_back_val(); |
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480 BasicBlock* B = sp.first; |
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481 BasicBlock::iterator BBI = sp.second; |
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482 // BBI is either just after the allocation (in the first iteration) |
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483 // or just after the last phi node in B (in subsequent iterations) here. |
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484 |
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485 // This whole 'if' is just a way to avoid performing the inner 'for' |
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486 // loop when it can be determined not to be necessary, avoiding |
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487 // potentially expensive walks of the instruction list. |
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488 // It should be equivalent to just doing the loop. |
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489 if (UserBlocks.count(B)) { |
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490 if (B != DefBlock && B != AllocBlock) { |
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491 // This block does not contain the definition or the allocation, |
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492 // so any user in this block is definitely reachable without |
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493 // finding either the definition or the allocation. |
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494 DOUT << "### Block " << B->getName() |
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495 << " contains a reachable user\n"; |
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496 return true; |
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497 } |
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498 // We need to walk the instructions in the block to see whether we |
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499 // reach a user before we reach the definition or the allocation. |
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500 for (BasicBlock::iterator E = B->end(); BBI != E; ++BBI) { |
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501 if (&*BBI == Alloc || &*BBI == Def) |
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502 break; |
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503 if (Users.count(BBI)) { |
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504 DOUT << "### Problematic user: " << *BBI; |
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505 return true; |
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diff
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|
506 } |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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diff
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|
507 } |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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508 } else if (B == DefBlock || (B == AllocBlock && BBI != Start)) { |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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|
509 // There are no users in the block so the def or the allocation |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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510 // will be encountered before any users though this path. |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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diff
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|
511 // Skip to the next item on the worklist. |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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512 continue; |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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|
513 } else { |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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|
514 // No users and no definition or allocation after the start point, |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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515 // so just keep going. |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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|
516 } |
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517 |
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|
518 // All instructions after the starting point in this block have been |
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519 // accounted for. Look for successors to add to the work list. |
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520 TerminatorInst* Term = B->getTerminator(); |
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521 unsigned SuccCount = Term->getNumSuccessors(); |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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522 for (unsigned i = 0; i < SuccCount; i++) { |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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523 BasicBlock* Succ = Term->getSuccessor(i); |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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524 BBI = Succ->begin(); |
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525 // Check phi nodes here because we only care about the operand |
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526 // coming in from this block. |
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527 bool SeenDef = false; |
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528 while (isa<PHINode>(BBI)) { |
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529 if (Def == cast<PHINode>(BBI)->getIncomingValueForBlock(B)) { |
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530 DOUT << "### Problematic phi user: " << *BBI; |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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531 return true; |
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532 } |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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533 SeenDef |= (Def == &*BBI); |
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534 ++BBI; |
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535 } |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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|
536 // If none of the phis we just looked at were the definition, we |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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|
537 // haven't seen this block yet, and it's dominated by the def |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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538 // (meaning paths through it could lead to users), add the block and |
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Teach stack promotion to walk the CFG when a potential reuse of an allocation
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539 // the first non-phi to the worklist. |
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540 if (!SeenDef && Visited.insert(Succ) && DT.dominates(DefBlock, Succ)) |
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|
541 Worklist.push_back(StartPoint(Succ, BBI)); |
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542 } |
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|
543 } |
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544 // No users found in any block reachable from Alloc |
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545 // without going through the definition again. |
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546 return false; |
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547 } |
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548 |
1285
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549 |
1486
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550 /// isSafeToStackAllocate - Return true if the GC call passed in is safe to turn |
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551 /// into a stack allocation. This requires that the return value does not |
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552 /// escape from the function and no derived pointers are live at the call site |
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553 /// (i.e. if it's in a loop then the function can't use any pointer returned |
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554 /// from an earlier call after a new call has been made) |
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555 /// |
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556 /// This is currently conservative where loops are involved: it can handle |
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557 /// simple loops, but returns false if any derived pointer is used in a |
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558 /// subsequent iteration. |
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559 /// |
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560 /// Based on LLVM's PointerMayBeCaptured(), which only does escape analysis but |
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Teach `-dgc2stack` to promote GC allocations in simple loops to stack
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561 /// doesn't care about loops. |
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ca31a8e9c42b
Oops, I accidentally pushed r1486 before the last touches were committed.
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562 bool isSafeToStackAllocate(Instruction* Alloc, DominatorTree& DT) { |
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|
563 assert(isa<PointerType>(Alloc->getType()) && "Allocation is not a pointer?"); |
1486
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564 Value* V = Alloc; |
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|
565 |
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|
566 SmallVector<Use*, 16> Worklist; |
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|
567 SmallSet<Use*, 16> Visited; |
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|
568 |
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569 for (Value::use_iterator UI = V->use_begin(), UE = V->use_end(); |
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570 UI != UE; ++UI) { |
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571 Use *U = &UI.getUse(); |
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572 Visited.insert(U); |
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573 Worklist.push_back(U); |
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574 } |
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575 |
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576 while (!Worklist.empty()) { |
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577 Use *U = Worklist.pop_back_val(); |
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578 Instruction *I = cast<Instruction>(U->getUser()); |
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|
579 V = U->get(); |
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|
580 |
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|
581 switch (I->getOpcode()) { |
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|
582 case Instruction::Call: |
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583 case Instruction::Invoke: { |
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584 CallSite CS = CallSite::get(I); |
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585 // Not captured if the callee is readonly, doesn't return a copy through |
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|
586 // its return value and doesn't unwind (a readonly function can leak bits |
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587 // by throwing an exception or not depending on the input value). |
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588 if (CS.onlyReadsMemory() && CS.doesNotThrow() && |
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|
589 I->getType() == Type::VoidTy) |
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|
590 break; |
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|
591 |
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|
592 // Not captured if only passed via 'nocapture' arguments. Note that |
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|
593 // calling a function pointer does not in itself cause the pointer to |
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|
594 // be captured. This is a subtle point considering that (for example) |
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|
595 // the callee might return its own address. It is analogous to saying |
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|
596 // that loading a value from a pointer does not cause the pointer to be |
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|
597 // captured, even though the loaded value might be the pointer itself |
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|
598 // (think of self-referential objects). |
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|
599 CallSite::arg_iterator B = CS.arg_begin(), E = CS.arg_end(); |
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600 for (CallSite::arg_iterator A = B; A != E; ++A) |
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601 if (A->get() == V && !CS.paramHasAttr(A - B + 1, Attribute::NoCapture)) |
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602 // The parameter is not marked 'nocapture' - captured. |
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|
603 return false; |
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604 // Only passed via 'nocapture' arguments, or is the called function - not |
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605 // captured. |
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|
606 break; |
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Teach `-dgc2stack` to promote GC allocations in simple loops to stack
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607 } |
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diff
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|
608 case Instruction::Free: |
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609 // Freeing a pointer does not cause it to be captured. |
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610 break; |
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611 case Instruction::Load: |
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612 // Loading from a pointer does not cause it to be captured. |
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613 break; |
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Teach `-dgc2stack` to promote GC allocations in simple loops to stack
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614 case Instruction::Store: |
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615 if (V == I->getOperand(0)) |
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616 // Stored the pointer - it may be captured. |
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617 return false; |
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618 // Storing to the pointee does not cause the pointer to be captured. |
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619 break; |
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620 case Instruction::BitCast: |
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621 case Instruction::GetElementPtr: |
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622 case Instruction::PHI: |
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623 case Instruction::Select: |
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624 // It's not safe to stack-allocate if this derived pointer is live across |
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625 // the original allocation. |
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626 if (mayBeUsedAfterRealloc(I, Alloc, DT)) |
1486
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627 return false; |
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628 |
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629 // The original value is not captured via this if the new value isn't. |
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630 for (Instruction::use_iterator UI = I->use_begin(), UE = I->use_end(); |
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631 UI != UE; ++UI) { |
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632 Use *U = &UI.getUse(); |
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633 if (Visited.insert(U)) |
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634 Worklist.push_back(U); |
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635 } |
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636 break; |
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637 default: |
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638 // Something else - be conservative and say it is captured. |
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639 return false; |
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640 } |
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641 } |
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642 |
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643 // All uses examined - not captured or live across original allocation. |
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644 return true; |
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645 } |