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annotate lib/Analysis/MemoryLocation.cpp @ 120:1172e4bd9c6f

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update 4.0.0
author mir3636
date Fri, 25 Nov 2016 19:14:25 +0900
parents afa8332a0e37
children 803732b1fca8
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95
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1 //===- MemoryLocation.cpp - Memory location descriptions -------------------==//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #include "llvm/Analysis/MemoryLocation.h"
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11 #include "llvm/Analysis/TargetLibraryInfo.h"
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12 #include "llvm/IR/BasicBlock.h"
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13 #include "llvm/IR/DataLayout.h"
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14 #include "llvm/IR/Instructions.h"
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15 #include "llvm/IR/IntrinsicInst.h"
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16 #include "llvm/IR/LLVMContext.h"
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17 #include "llvm/IR/Module.h"
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18 #include "llvm/IR/Type.h"
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19 using namespace llvm;
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20
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21 MemoryLocation MemoryLocation::get(const LoadInst *LI) {
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22 AAMDNodes AATags;
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23 LI->getAAMetadata(AATags);
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24 const auto &DL = LI->getModule()->getDataLayout();
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25
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26 return MemoryLocation(LI->getPointerOperand(),
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27 DL.getTypeStoreSize(LI->getType()), AATags);
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28 }
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29
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30 MemoryLocation MemoryLocation::get(const StoreInst *SI) {
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31 AAMDNodes AATags;
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32 SI->getAAMetadata(AATags);
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33 const auto &DL = SI->getModule()->getDataLayout();
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34
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35 return MemoryLocation(SI->getPointerOperand(),
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36 DL.getTypeStoreSize(SI->getValueOperand()->getType()),
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37 AATags);
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38 }
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39
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40 MemoryLocation MemoryLocation::get(const VAArgInst *VI) {
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41 AAMDNodes AATags;
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42 VI->getAAMetadata(AATags);
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43
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44 return MemoryLocation(VI->getPointerOperand(), UnknownSize, AATags);
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45 }
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46
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47 MemoryLocation MemoryLocation::get(const AtomicCmpXchgInst *CXI) {
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48 AAMDNodes AATags;
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49 CXI->getAAMetadata(AATags);
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50 const auto &DL = CXI->getModule()->getDataLayout();
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51
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52 return MemoryLocation(
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53 CXI->getPointerOperand(),
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54 DL.getTypeStoreSize(CXI->getCompareOperand()->getType()), AATags);
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55 }
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56
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57 MemoryLocation MemoryLocation::get(const AtomicRMWInst *RMWI) {
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58 AAMDNodes AATags;
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59 RMWI->getAAMetadata(AATags);
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60 const auto &DL = RMWI->getModule()->getDataLayout();
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61
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62 return MemoryLocation(RMWI->getPointerOperand(),
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63 DL.getTypeStoreSize(RMWI->getValOperand()->getType()),
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64 AATags);
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65 }
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66
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67 MemoryLocation MemoryLocation::getForSource(const MemTransferInst *MTI) {
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68 uint64_t Size = UnknownSize;
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69 if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
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70 Size = C->getValue().getZExtValue();
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71
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72 // memcpy/memmove can have AA tags. For memcpy, they apply
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73 // to both the source and the destination.
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74 AAMDNodes AATags;
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75 MTI->getAAMetadata(AATags);
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76
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77 return MemoryLocation(MTI->getRawSource(), Size, AATags);
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78 }
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79
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80 MemoryLocation MemoryLocation::getForDest(const MemIntrinsic *MTI) {
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81 uint64_t Size = UnknownSize;
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82 if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
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83 Size = C->getValue().getZExtValue();
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84
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85 // memcpy/memmove can have AA tags. For memcpy, they apply
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86 // to both the source and the destination.
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87 AAMDNodes AATags;
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88 MTI->getAAMetadata(AATags);
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89
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90 return MemoryLocation(MTI->getRawDest(), Size, AATags);
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91 }
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92
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93 MemoryLocation MemoryLocation::getForArgument(ImmutableCallSite CS,
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94 unsigned ArgIdx,
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95 const TargetLibraryInfo &TLI) {
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96 AAMDNodes AATags;
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97 CS->getAAMetadata(AATags);
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98 const Value *Arg = CS.getArgument(ArgIdx);
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99
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100 // We may be able to produce an exact size for known intrinsics.
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101 if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(CS.getInstruction())) {
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102 const DataLayout &DL = II->getModule()->getDataLayout();
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103
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104 switch (II->getIntrinsicID()) {
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105 default:
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106 break;
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107 case Intrinsic::memset:
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108 case Intrinsic::memcpy:
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109 case Intrinsic::memmove:
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110 assert((ArgIdx == 0 || ArgIdx == 1) &&
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111 "Invalid argument index for memory intrinsic");
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112 if (ConstantInt *LenCI = dyn_cast<ConstantInt>(II->getArgOperand(2)))
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113 return MemoryLocation(Arg, LenCI->getZExtValue(), AATags);
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114 break;
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115
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116 case Intrinsic::lifetime_start:
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117 case Intrinsic::lifetime_end:
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118 case Intrinsic::invariant_start:
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119 assert(ArgIdx == 1 && "Invalid argument index");
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120 return MemoryLocation(
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121 Arg, cast<ConstantInt>(II->getArgOperand(0))->getZExtValue(), AATags);
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122
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123 case Intrinsic::invariant_end:
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124 assert(ArgIdx == 2 && "Invalid argument index");
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125 return MemoryLocation(
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126 Arg, cast<ConstantInt>(II->getArgOperand(1))->getZExtValue(), AATags);
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127
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128 case Intrinsic::arm_neon_vld1:
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129 assert(ArgIdx == 0 && "Invalid argument index");
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130 // LLVM's vld1 and vst1 intrinsics currently only support a single
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131 // vector register.
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132 return MemoryLocation(Arg, DL.getTypeStoreSize(II->getType()), AATags);
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133
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134 case Intrinsic::arm_neon_vst1:
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135 assert(ArgIdx == 0 && "Invalid argument index");
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136 return MemoryLocation(
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137 Arg, DL.getTypeStoreSize(II->getArgOperand(1)->getType()), AATags);
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138 }
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139 }
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140
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141 // We can bound the aliasing properties of memset_pattern16 just as we can
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142 // for memcpy/memset. This is particularly important because the
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143 // LoopIdiomRecognizer likes to turn loops into calls to memset_pattern16
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144 // whenever possible.
120
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145 LibFunc::Func F;
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146 if (CS.getCalledFunction() && TLI.getLibFunc(*CS.getCalledFunction(), F) &&
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147 F == LibFunc::memset_pattern16 && TLI.has(F)) {
95
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148 assert((ArgIdx == 0 || ArgIdx == 1) &&
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149 "Invalid argument index for memset_pattern16");
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150 if (ArgIdx == 1)
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151 return MemoryLocation(Arg, 16, AATags);
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152 if (const ConstantInt *LenCI = dyn_cast<ConstantInt>(CS.getArgument(2)))
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153 return MemoryLocation(Arg, LenCI->getZExtValue(), AATags);
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154 }
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155 // FIXME: Handle memset_pattern4 and memset_pattern8 also.
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156
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157 return MemoryLocation(CS.getArgument(ArgIdx), UnknownSize, AATags);
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158 }