Mercurial > hg > CbC > CbC_llvm

annotate lib/IR/Use.cpp @ 21:fc4a6333556f

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change error message when tail call elimination is failed.
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 14 Oct 2013 19:09:00 +0900
parents 9ad51c7bc036
children 54457678186b
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1 //===-- Use.cpp - Implement the Use class ---------------------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the algorithm for finding the User of a Use.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/IR/Value.h"
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15 #include <new>
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16
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17 namespace llvm {
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18
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19 //===----------------------------------------------------------------------===//
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20 // Use swap Implementation
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21 //===----------------------------------------------------------------------===//
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22
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23 void Use::swap(Use &RHS) {
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24 Value *V1(Val);
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25 Value *V2(RHS.Val);
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26 if (V1 != V2) {
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27 if (V1) {
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28 removeFromList();
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29 }
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30
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31 if (V2) {
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32 RHS.removeFromList();
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33 Val = V2;
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34 V2->addUse(*this);
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35 } else {
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36 Val = 0;
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37 }
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38
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39 if (V1) {
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40 RHS.Val = V1;
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41 V1->addUse(RHS);
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42 } else {
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43 RHS.Val = 0;
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44 }
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45 }
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46 }
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47
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48 //===----------------------------------------------------------------------===//
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49 // Use getImpliedUser Implementation
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50 //===----------------------------------------------------------------------===//
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51
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52 const Use *Use::getImpliedUser() const {
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53 const Use *Current = this;
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54
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55 while (true) {
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56 unsigned Tag = (Current++)->Prev.getInt();
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57 switch (Tag) {
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58 case zeroDigitTag:
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59 case oneDigitTag:
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60 continue;
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61
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62 case stopTag: {
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63 ++Current;
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64 ptrdiff_t Offset = 1;
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65 while (true) {
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66 unsigned Tag = Current->Prev.getInt();
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67 switch (Tag) {
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68 case zeroDigitTag:
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69 case oneDigitTag:
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70 ++Current;
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71 Offset = (Offset << 1) + Tag;
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72 continue;
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73 default:
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74 return Current + Offset;
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75 }
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76 }
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77 }
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78
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79 case fullStopTag:
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80 return Current;
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81 }
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82 }
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83 }
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84
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85 //===----------------------------------------------------------------------===//
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86 // Use initTags Implementation
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87 //===----------------------------------------------------------------------===//
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88
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89 Use *Use::initTags(Use * const Start, Use *Stop) {
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90 ptrdiff_t Done = 0;
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91 while (Done < 20) {
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92 if (Start == Stop--)
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93 return Start;
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94 static const PrevPtrTag tags[20] = { fullStopTag, oneDigitTag, stopTag,
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95 oneDigitTag, oneDigitTag, stopTag,
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96 zeroDigitTag, oneDigitTag, oneDigitTag,
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97 stopTag, zeroDigitTag, oneDigitTag,
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98 zeroDigitTag, oneDigitTag, stopTag,
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99 oneDigitTag, oneDigitTag, oneDigitTag,
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100 oneDigitTag, stopTag
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101 };
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102 new(Stop) Use(tags[Done++]);
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103 }
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104
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105 ptrdiff_t Count = Done;
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106 while (Start != Stop) {
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107 --Stop;
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108 if (!Count) {
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109 new(Stop) Use(stopTag);
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110 ++Done;
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111 Count = Done;
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112 } else {
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113 new(Stop) Use(PrevPtrTag(Count & 1));
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114 Count >>= 1;
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115 ++Done;
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116 }
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117 }
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118
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119 return Start;
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120 }
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121
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122 //===----------------------------------------------------------------------===//
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123 // Use zap Implementation
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124 //===----------------------------------------------------------------------===//
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125
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126 void Use::zap(Use *Start, const Use *Stop, bool del) {
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127 while (Start != Stop)
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128 (--Stop)->~Use();
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129 if (del)
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130 ::operator delete(Start);
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131 }
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132
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133 //===----------------------------------------------------------------------===//
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134 // Use getUser Implementation
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135 //===----------------------------------------------------------------------===//
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136
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137 User *Use::getUser() const {
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138 const Use *End = getImpliedUser();
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139 const UserRef *ref = reinterpret_cast<const UserRef*>(End);
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140 return ref->getInt()
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141 ? ref->getPointer()
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142 : reinterpret_cast<User*>(const_cast<Use*>(End));
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143 }
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144
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145 } // End llvm namespace