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annotate gen/passes/GarbageCollect2Stack.cpp @ 1344:3297edb697eb

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Re-enable consistency check for fixed LLVM versions.
author Frits van Bommel <fvbommel wxs.nl>
date Mon, 11 May 2009 15:48:33 +0200
parents c21a6654cce2
children 15e9762bb620
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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 // This pass doesn't work without metadata, so #ifdef it out entirely if the
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18 // LLVM version in use doesn't support it.
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19 #ifdef USE_METADATA
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20
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21
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22 #define DEBUG_TYPE "dgc2stack"
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23
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24 #include "Passes.h"
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25
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26 #include "llvm/Pass.h"
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27 #include "llvm/Module.h"
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28 #include "llvm/Intrinsics.h"
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29 #include "llvm/Support/CallSite.h"
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30 #include "llvm/Support/CommandLine.h"
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31 #include "llvm/Support/IRBuilder.h"
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32 #include "llvm/Analysis/CaptureTracking.h"
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33 #include "llvm/Analysis/ValueTracking.h"
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34 #include "llvm/Analysis/LoopInfo.h"
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35 #include "llvm/Target/TargetData.h"
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36 #include "llvm/ADT/StringMap.h"
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37 #include "llvm/ADT/Statistic.h"
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38 #include "llvm/Support/Compiler.h"
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39 #include "llvm/Support/Debug.h"
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40 using namespace llvm;
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41
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42 STATISTIC(NumGcToStack, "Number of calls promoted to constant-size allocas");
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43 STATISTIC(NumToDynSize, "Number of calls promoted to dynamically-sized allocas");
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44 STATISTIC(NumDeleted, "Number of GC calls deleted because the return value was unused");
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45
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46 //===----------------------------------------------------------------------===//
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47 // Helper functions
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48 //===----------------------------------------------------------------------===//
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49
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50 void EmitMemSet(IRBuilder<>& B, Value* Dst, Value* Val, Value* Len) {
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51 Dst = B.CreateBitCast(Dst, PointerType::getUnqual(Type::Int8Ty));
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52
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53 Module *M = B.GetInsertBlock()->getParent()->getParent();
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54 const Type* Tys[1];
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55 Tys[0] = Len->getType();
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56 Value *MemSet = Intrinsic::getDeclaration(M, Intrinsic::memset, Tys, 1);
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57 Value *Align = ConstantInt::get(Type::Int32Ty, 1);
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58
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59 B.CreateCall4(MemSet, Dst, Val, Len, Align);
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60 }
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61
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62 static void EmitMemZero(IRBuilder<>& B, Value* Dst, Value* Len) {
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63 EmitMemSet(B, Dst, ConstantInt::get(Type::Int8Ty, 0), Len);
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64 }
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65
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66
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67 //===----------------------------------------------------------------------===//
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68 // Helpers for specific types of GC calls.
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69 //===----------------------------------------------------------------------===//
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70
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71 namespace {
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72 struct Analysis {
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73 TargetData& TD;
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74 const Module& M;
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75
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76 const Type* getTypeFor(Value* typeinfo) const;
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77 };
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78
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79 class FunctionInfo {
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80 protected:
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81 const Type* Ty;
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82
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83 public:
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84 unsigned TypeInfoArgNr;
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85 bool SafeToDelete;
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86
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87 // Analyze the current call, filling in some fields. Returns true if
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88 // this is an allocation we can stack-allocate.
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89 virtual bool analyze(CallSite CS, const Analysis& A) {
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90 Value* TypeInfo = CS.getArgument(TypeInfoArgNr);
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91 Ty = A.getTypeFor(TypeInfo);
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92 return (Ty != NULL);
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93 }
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94
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95 // Returns the alloca to replace this call.
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96 // It will always be inserted before the call.
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97 virtual AllocaInst* promote(CallSite CS, IRBuilder<>& B, const Analysis& A) {
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98 NumGcToStack++;
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99
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100 Instruction* Begin = CS.getCaller()->getEntryBlock().begin();
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101 return new AllocaInst(Ty, ".nongc_mem", Begin);
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102 }
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103
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104 FunctionInfo(unsigned typeInfoArgNr, bool safeToDelete)
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105 : TypeInfoArgNr(typeInfoArgNr), SafeToDelete(safeToDelete) {}
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106 };
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107
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108 class ArrayFI : public FunctionInfo {
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109 Value* arrSize;
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110 int ArrSizeArgNr;
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111 bool Initialized;
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112
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113 public:
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114 ArrayFI(unsigned tiArgNr, bool safeToDelete, bool initialized,
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115 unsigned arrSizeArgNr)
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116 : FunctionInfo(tiArgNr, safeToDelete),
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117 ArrSizeArgNr(arrSizeArgNr),
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118 Initialized(initialized)
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119 {}
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120
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121 virtual bool analyze(CallSite CS, const Analysis& A) {
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122 if (!FunctionInfo::analyze(CS, A))
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123 return false;
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124
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125 arrSize = CS.getArgument(ArrSizeArgNr);
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126 const IntegerType* SizeType =
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127 dyn_cast<IntegerType>(arrSize->getType());
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128 if (!SizeType)
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129 return false;
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130 unsigned bits = SizeType->getBitWidth();
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131 if (bits > 32) {
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132 // The array size of an alloca must be an i32, so make sure
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133 // the conversion is safe.
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134 APInt Mask = APInt::getHighBitsSet(bits, bits - 32);
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135 APInt KnownZero(bits, 0), KnownOne(bits, 0);
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136 ComputeMaskedBits(arrSize, Mask, KnownZero, KnownOne, &A.TD);
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137 if ((KnownZero & Mask) != Mask)
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138 return false;
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139 }
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140 // Extract the element type from the array type.
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141 const StructType* ArrTy = dyn_cast<StructType>(Ty);
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142 assert(ArrTy && "Dynamic array type not a struct?");
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143 assert(isa<IntegerType>(ArrTy->getElementType(0)));
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144 const PointerType* PtrTy =
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145 cast<PointerType>(ArrTy->getElementType(1));
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146 Ty = PtrTy->getElementType();
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147 return true;
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148 }
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149
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150 virtual AllocaInst* promote(CallSite CS, IRBuilder<>& B, const Analysis& A) {
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151 IRBuilder<> Builder = B;
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152 // If the allocation is of constant size it's best to put it in the
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153 // entry block, so do so if we're not already there.
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154 // For dynamically-sized allocations it's best to avoid the overhead
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155 // of allocating them if possible, so leave those where they are.
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156 // While we're at it, update statistics too.
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157 if (isa<Constant>(arrSize)) {
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158 BasicBlock& Entry = CS.getCaller()->getEntryBlock();
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159 if (Builder.GetInsertBlock() != &Entry)
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160 Builder.SetInsertPoint(&Entry, Entry.begin());
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161 NumGcToStack++;
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162 } else {
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163 NumToDynSize++;
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164 }
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165
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166 // Convert array size to 32 bits if necessary
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167 Value* count = Builder.CreateIntCast(arrSize, Type::Int32Ty, false);
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168 AllocaInst* alloca = Builder.CreateAlloca(Ty, count, ".nongc_mem");
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169
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170 if (Initialized) {
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171 // For now, only zero-init is supported.
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172 uint64_t size = A.TD.getTypeStoreSize(Ty);
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173 Value* TypeSize = ConstantInt::get(arrSize->getType(), size);
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174 // Use the original B to put initialization at the
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175 // allocation site.
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176 Value* Size = B.CreateMul(TypeSize, arrSize);
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177 EmitMemZero(B, alloca, Size);
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178 }
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179
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180 return alloca;
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181 }
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182 };
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183
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184 // FunctionInfo for _d_allocclass
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185 class AllocClassFI : public FunctionInfo {
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186 public:
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187 virtual bool analyze(CallSite CS, const Analysis& A) {
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188 // This call contains no TypeInfo parameter, so don't call the
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189 // base class implementation here...
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190 if (CS.arg_size() != 1)
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191 return false;
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192 Value* arg = CS.getArgument(0)->stripPointerCasts();
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193 GlobalVariable* ClassInfo = dyn_cast<GlobalVariable>(arg);
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194 if (!ClassInfo)
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195 return false;
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196
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197 std::string metaname = CD_PREFIX;
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198 metaname.append(ClassInfo->getNameStart(), ClassInfo->getNameEnd());
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199
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200 GlobalVariable* global = A.M.getGlobalVariable(metaname);
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201 if (!global || !global->hasInitializer())
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202 return false;
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203
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204 MDNode* node = dyn_cast<MDNode>(global->getInitializer());
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205 if (!node || MD_GetNumElements(node) != CD_NumFields)
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206 return false;
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207
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208 // Inserting destructor calls is not implemented yet, so classes
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209 // with destructors are ignored for now.
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210 Constant* hasDestructor = dyn_cast<Constant>(MD_GetElement(node, CD_Finalize));
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211 // We can't stack-allocate if the class has a custom deallocator
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212 // (Custom allocators don't get turned into this runtime call, so
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213 // those can be ignored)
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214 Constant* hasCustomDelete = dyn_cast<Constant>(MD_GetElement(node, CD_CustomDelete));
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215 if (hasDestructor == NULL || hasCustomDelete == NULL)
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216 return false;
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217
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218 if (ConstantExpr::getOr(hasDestructor, hasCustomDelete)
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219 != ConstantInt::getFalse())
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220 return false;
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221
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222 Ty = MD_GetElement(node, CD_BodyType)->getType();
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223 return true;
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224 }
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225
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226 // The default promote() should be fine.
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227
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228 AllocClassFI() : FunctionInfo(-1, true) {}
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229 };
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230 }
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231
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232
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233 //===----------------------------------------------------------------------===//
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234 // GarbageCollect2Stack Pass Implementation
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235 //===----------------------------------------------------------------------===//
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236
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237 namespace {
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238 /// This pass replaces GC calls with alloca's
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239 ///
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240 class VISIBILITY_HIDDEN GarbageCollect2Stack : public FunctionPass {
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241 StringMap<FunctionInfo*> KnownFunctions;
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242 Module* M;
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243
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244 FunctionInfo AllocMemoryT;
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245 ArrayFI NewArrayVT;
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246 ArrayFI NewArrayT;
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247 AllocClassFI AllocClass;
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248
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249 public:
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250 static char ID; // Pass identification
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251 GarbageCollect2Stack();
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252
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253 bool doInitialization(Module &M) {
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254 this->M = &M;
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255 }
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256
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257 bool runOnFunction(Function &F);
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258
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259 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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260 AU.addRequired<TargetData>();
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261 AU.addRequired<LoopInfo>();
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262 }
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263 };
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264 char GarbageCollect2Stack::ID = 0;
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265 } // end anonymous namespace.
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266
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267 static RegisterPass<GarbageCollect2Stack>
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268 X("dgc2stack", "Promote (GC'ed) heap allocations to stack");
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269
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270 // Public interface to the pass.
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271 FunctionPass *createGarbageCollect2Stack() {
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272 return new GarbageCollect2Stack();
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273 }
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274
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275 GarbageCollect2Stack::GarbageCollect2Stack()
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276 : FunctionPass(&ID),
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diff changeset
277 AllocMemoryT(0, true),
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diff changeset
278 NewArrayVT(0, true, false, 1),
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diff changeset
279 NewArrayT(0, true, true, 1)
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diff changeset
280 {
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diff changeset
281 KnownFunctions["_d_allocmemoryT"] = &AllocMemoryT;
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282 KnownFunctions["_d_newarrayvT"] = &NewArrayVT;
1307
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diff changeset
283 KnownFunctions["_d_newarrayT"] = &NewArrayT;
1317
4099548c80e0 Allocate objects on the stack if they (a) don't have a destructor, and
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284 KnownFunctions["_d_allocclass"] = &AllocClass;
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285 }
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286
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287 static void RemoveCall(Instruction* Inst) {
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288 if (InvokeInst* Invoke = dyn_cast<InvokeInst>(Inst)) {
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289 // If this was an invoke instruction, we need to do some extra
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290 // work to preserve the control flow.
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diff changeset
291
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292 // First notify the exception landing pad block that we won't be
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293 // going there anymore.
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294 Invoke->getUnwindDest()->removePredecessor(Invoke->getParent());
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295 // Create a branch to the "normal" destination.
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296 BranchInst::Create(Invoke->getNormalDest(), Invoke->getParent());
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297 }
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298 // Remove the runtime call.
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diff changeset
299 Inst->eraseFromParent();
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300 }
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diff changeset
301
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302 /// runOnFunction - Top level algorithm.
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303 ///
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304 bool GarbageCollect2Stack::runOnFunction(Function &F) {
1295
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diff changeset
305 DEBUG(DOUT << "Running -dgc2stack on function " << F.getName() << '\n');
1285
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306
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diff changeset
307 TargetData &TD = getAnalysis<TargetData>();
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diff changeset
308 const LoopInfo &LI = getAnalysis<LoopInfo>();
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309
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diff changeset
310 Analysis A = { TD, *M };
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diff changeset
311
1285
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diff changeset
312 BasicBlock& Entry = F.getEntryBlock();
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diff changeset
313
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diff changeset
314 IRBuilder<> AllocaBuilder(&Entry, Entry.begin());
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diff changeset
315
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diff changeset
316 bool Changed = false;
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diff changeset
317 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
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318 // We don't yet have sufficient analysis to properly determine if
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319 // allocations will be unreferenced when the loop returns to their
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320 // allocation point, so we're playing it safe by ignoring allocations
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diff changeset
321 // in loops.
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322 // TODO: Analyze loops too...
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diff changeset
323 if (LI.getLoopFor(BB)) {
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
diff changeset
324 continue;
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diff changeset
325 }
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
diff changeset
326
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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diff changeset
327 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
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diff changeset
328 // Ignore non-calls.
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diff changeset
329 Instruction* Inst = I++;
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diff changeset
330 CallSite CS = CallSite::get(Inst);
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diff changeset
331 if (!CS.getInstruction())
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diff changeset
332 continue;
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parents:
diff changeset
333
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diff changeset
334 // Ignore indirect calls and calls to non-external functions.
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diff changeset
335 Function *Callee = CS.getCalledFunction();
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diff changeset
336 if (Callee == 0 || !Callee->isDeclaration() ||
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diff changeset
337 !(Callee->hasExternalLinkage() || Callee->hasDLLImportLinkage()))
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diff changeset
338 continue;
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parents:
diff changeset
339
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340 // Ignore unknown calls.
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diff changeset
341 const char *CalleeName = Callee->getNameStart();
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diff changeset
342 StringMap<FunctionInfo*>::iterator OMI =
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diff changeset
343 KnownFunctions.find(CalleeName, CalleeName+Callee->getNameLen());
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diff changeset
344 if (OMI == KnownFunctions.end()) continue;
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diff changeset
345
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diff changeset
346 assert(isa<PointerType>(Inst->getType())
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diff changeset
347 && "GC function doesn't return a pointer?");
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diff changeset
348
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diff changeset
349 FunctionInfo* info = OMI->getValue();
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parents:
diff changeset
350
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diff changeset
351 if (Inst->use_empty() && info->SafeToDelete) {
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diff changeset
352 Changed = true;
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diff changeset
353 NumDeleted++;
1298
7e303f9f16c7 Don't forget to update the control flow when deleting an invoke.
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parents: 1297
diff changeset
354 RemoveCall(Inst);
1285
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
diff changeset
355 continue;
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parents:
diff changeset
356 }
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parents:
diff changeset
357
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
diff changeset
358 DEBUG(DOUT << "GarbageCollect2Stack inspecting: " << *Inst);
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parents:
diff changeset
359
1306
b61db48127fd Some refactoring
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diff changeset
360 if (!info->analyze(CS, A) || PointerMayBeCaptured(Inst, true))
1285
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
diff changeset
361 continue;
1305
8215dbf0e09f Postpone (expensive) escape analysis until we're sure it's needed.
Frits van Bommel <fvbommel wxs.nl>
parents: 1298
diff changeset
362
1285
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
diff changeset
363 // Let's alloca this!
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parents:
diff changeset
364 Changed = true;
1297
8e8552601ecd Stack promotion for _d_newarrayvT. Array literals, concatenations (a ~ b) and
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parents: 1295
diff changeset
365
1307
e2ec50329af1 Stack-allocate zero-initialized arrays.
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parents: 1306
diff changeset
366 IRBuilder<> Builder(BB, Inst);
e2ec50329af1 Stack-allocate zero-initialized arrays.
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parents: 1306
diff changeset
367 Value* newVal = info->promote(CS, Builder, A);
1297
8e8552601ecd Stack promotion for _d_newarrayvT. Array literals, concatenations (a ~ b) and
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parents: 1295
diff changeset
368
1343
c21a6654cce2 Update for metadata changes in LLVM trunk.
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parents: 1317
diff changeset
369 DEBUG(DOUT << "Promoted to: " << *newVal);
c21a6654cce2 Update for metadata changes in LLVM trunk.
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parents: 1317
diff changeset
370
1297
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parents: 1295
diff changeset
371 // Make sure the type is the same as it was before, and replace all
8e8552601ecd Stack promotion for _d_newarrayvT. Array literals, concatenations (a ~ b) and
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parents: 1295
diff changeset
372 // uses of the runtime call with the alloca.
1285
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
diff changeset
373 if (newVal->getType() != Inst->getType())
1307
e2ec50329af1 Stack-allocate zero-initialized arrays.
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parents: 1306
diff changeset
374 newVal = Builder.CreateBitCast(newVal, Inst->getType());
1285
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
diff changeset
375 Inst->replaceAllUsesWith(newVal);
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parents:
diff changeset
376
1298
7e303f9f16c7 Don't forget to update the control flow when deleting an invoke.
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diff changeset
377 RemoveCall(Inst);
1285
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diff changeset
378 }
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diff changeset
379 }
1297
8e8552601ecd Stack promotion for _d_newarrayvT. Array literals, concatenations (a ~ b) and
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parents: 1295
diff changeset
380
1285
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diff changeset
381 return Changed;
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parents:
diff changeset
382 }
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parents:
diff changeset
383
1306
b61db48127fd Some refactoring
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parents: 1305
diff changeset
384 const Type* Analysis::getTypeFor(Value* typeinfo) const {
1285
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parents:
diff changeset
385 GlobalVariable* ti_global = dyn_cast<GlobalVariable>(typeinfo->stripPointerCasts());
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parents:
diff changeset
386 if (!ti_global)
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parents:
diff changeset
387 return NULL;
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parents:
diff changeset
388
1291
875afb7a93b6 Factor out some constants into the header so producers and consumers of
Frits van Bommel <fvbommel wxs.nl>
parents: 1285
diff changeset
389 std::string metaname = TD_PREFIX;
1285
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parents:
diff changeset
390 metaname.append(ti_global->getNameStart(), ti_global->getNameEnd());
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parents:
diff changeset
391
1306
b61db48127fd Some refactoring
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diff changeset
392 GlobalVariable* global = M.getGlobalVariable(metaname);
1285
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
diff changeset
393 if (!global || !global->hasInitializer())
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parents:
diff changeset
394 return NULL;
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parents:
diff changeset
395
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
diff changeset
396 MDNode* node = dyn_cast<MDNode>(global->getInitializer());
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parents:
diff changeset
397 if (!node)
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parents:
diff changeset
398 return NULL;
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Frits van Bommel <fvbommel wxs.nl>
parents:
diff changeset
399
1344
3297edb697eb Re-enable consistency check for fixed LLVM versions.
Frits van Bommel <fvbommel wxs.nl>
parents: 1343
diff changeset
400 if (MD_GetNumElements(node) != TD_NumFields)
3297edb697eb Re-enable consistency check for fixed LLVM versions.
Frits van Bommel <fvbommel wxs.nl>
parents: 1343
diff changeset
401 return NULL;
3297edb697eb Re-enable consistency check for fixed LLVM versions.
Frits van Bommel <fvbommel wxs.nl>
parents: 1343
diff changeset
402 if (TD_Confirm >= 0 && (!MD_GetElement(node, TD_Confirm) ||
3297edb697eb Re-enable consistency check for fixed LLVM versions.
Frits van Bommel <fvbommel wxs.nl>
parents: 1343
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403 MD_GetElement(node, TD_Confirm)->stripPointerCasts() != ti_global))
1285
91d9386d4a5a Implement another D-specific pass: -dgc2stack
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parents:
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404 return NULL;
91d9386d4a5a Implement another D-specific pass: -dgc2stack
Frits van Bommel <fvbommel wxs.nl>
parents:
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405
1343
c21a6654cce2 Update for metadata changes in LLVM trunk.
Frits van Bommel <fvbommel wxs.nl>
parents: 1317
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406 return MD_GetElement(node, TD_Type)->getType();
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parents:
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407 }
91d9386d4a5a Implement another D-specific pass: -dgc2stack
Frits van Bommel <fvbommel wxs.nl>
parents:
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408
91d9386d4a5a Implement another D-specific pass: -dgc2stack
Frits van Bommel <fvbommel wxs.nl>
parents:
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409
91d9386d4a5a Implement another D-specific pass: -dgc2stack
Frits van Bommel <fvbommel wxs.nl>
parents:
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410 #endif //USE_METADATA