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annotate lib/Transforms/ObjCARC/ObjCARCUtil.cpp @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 95c75e76d11b
children
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1 //===- ObjCARCUtil.cpp - ObjC ARC Optimization ----------------------------===//
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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 /// \file
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10 /// This file defines several utility functions used by various ARC
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11 /// optimizations which are IMHO too big to be in a header file.
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12 ///
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13 /// WARNING: This file knows about certain library functions. It recognizes them
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14 /// by name, and hardwires knowledge of their semantics.
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15 ///
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16 /// WARNING: This file knows about how certain Objective-C library functions are
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17 /// used. Naive LLVM IR transformations which would otherwise be
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18 /// behavior-preserving may break these assumptions.
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19 ///
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20 //===----------------------------------------------------------------------===//
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21
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22 #include "ObjCARC.h"
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23 #include "llvm/IR/Intrinsics.h"
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24
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25 using namespace llvm;
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26 using namespace llvm::objcarc;
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27
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28 raw_ostream &llvm::objcarc::operator<<(raw_ostream &OS,
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29 const InstructionClass Class) {
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30 switch (Class) {
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31 case IC_Retain:
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32 return OS << "IC_Retain";
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33 case IC_RetainRV:
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34 return OS << "IC_RetainRV";
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35 case IC_RetainBlock:
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36 return OS << "IC_RetainBlock";
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37 case IC_Release:
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38 return OS << "IC_Release";
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39 case IC_Autorelease:
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40 return OS << "IC_Autorelease";
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41 case IC_AutoreleaseRV:
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42 return OS << "IC_AutoreleaseRV";
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43 case IC_AutoreleasepoolPush:
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44 return OS << "IC_AutoreleasepoolPush";
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45 case IC_AutoreleasepoolPop:
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46 return OS << "IC_AutoreleasepoolPop";
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47 case IC_NoopCast:
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48 return OS << "IC_NoopCast";
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49 case IC_FusedRetainAutorelease:
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50 return OS << "IC_FusedRetainAutorelease";
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51 case IC_FusedRetainAutoreleaseRV:
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52 return OS << "IC_FusedRetainAutoreleaseRV";
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53 case IC_LoadWeakRetained:
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54 return OS << "IC_LoadWeakRetained";
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55 case IC_StoreWeak:
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56 return OS << "IC_StoreWeak";
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57 case IC_InitWeak:
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58 return OS << "IC_InitWeak";
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59 case IC_LoadWeak:
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60 return OS << "IC_LoadWeak";
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61 case IC_MoveWeak:
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62 return OS << "IC_MoveWeak";
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63 case IC_CopyWeak:
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64 return OS << "IC_CopyWeak";
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65 case IC_DestroyWeak:
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66 return OS << "IC_DestroyWeak";
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67 case IC_StoreStrong:
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68 return OS << "IC_StoreStrong";
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69 case IC_CallOrUser:
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70 return OS << "IC_CallOrUser";
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71 case IC_Call:
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72 return OS << "IC_Call";
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73 case IC_User:
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74 return OS << "IC_User";
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75 case IC_IntrinsicUser:
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76 return OS << "IC_IntrinsicUser";
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77 case IC_None:
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78 return OS << "IC_None";
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79 }
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80 llvm_unreachable("Unknown instruction class!");
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81 }
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82
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83 InstructionClass llvm::objcarc::GetFunctionClass(const Function *F) {
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84 Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
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85
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86 // No (mandatory) arguments.
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87 if (AI == AE)
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88 return StringSwitch<InstructionClass>(F->getName())
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89 .Case("objc_autoreleasePoolPush", IC_AutoreleasepoolPush)
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90 .Case("clang.arc.use", IC_IntrinsicUser)
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91 .Default(IC_CallOrUser);
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92
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93 // One argument.
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94 const Argument *A0 = AI++;
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95 if (AI == AE)
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96 // Argument is a pointer.
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97 if (PointerType *PTy = dyn_cast<PointerType>(A0->getType())) {
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98 Type *ETy = PTy->getElementType();
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99 // Argument is i8*.
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100 if (ETy->isIntegerTy(8))
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101 return StringSwitch<InstructionClass>(F->getName())
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102 .Case("objc_retain", IC_Retain)
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103 .Case("objc_retainAutoreleasedReturnValue", IC_RetainRV)
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104 .Case("objc_retainBlock", IC_RetainBlock)
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105 .Case("objc_release", IC_Release)
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106 .Case("objc_autorelease", IC_Autorelease)
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107 .Case("objc_autoreleaseReturnValue", IC_AutoreleaseRV)
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108 .Case("objc_autoreleasePoolPop", IC_AutoreleasepoolPop)
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109 .Case("objc_retainedObject", IC_NoopCast)
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110 .Case("objc_unretainedObject", IC_NoopCast)
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111 .Case("objc_unretainedPointer", IC_NoopCast)
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112 .Case("objc_retain_autorelease", IC_FusedRetainAutorelease)
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113 .Case("objc_retainAutorelease", IC_FusedRetainAutorelease)
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114 .Case("objc_retainAutoreleaseReturnValue",IC_FusedRetainAutoreleaseRV)
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115 .Case("objc_sync_enter", IC_User)
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116 .Case("objc_sync_exit", IC_User)
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117 .Default(IC_CallOrUser);
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118
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119 // Argument is i8**
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120 if (PointerType *Pte = dyn_cast<PointerType>(ETy))
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121 if (Pte->getElementType()->isIntegerTy(8))
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122 return StringSwitch<InstructionClass>(F->getName())
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123 .Case("objc_loadWeakRetained", IC_LoadWeakRetained)
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124 .Case("objc_loadWeak", IC_LoadWeak)
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125 .Case("objc_destroyWeak", IC_DestroyWeak)
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126 .Default(IC_CallOrUser);
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127 }
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diff changeset
128
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
129 // Two arguments, first is i8**.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 const Argument *A1 = AI++;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
131 if (AI == AE)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
132 if (PointerType *PTy = dyn_cast<PointerType>(A0->getType()))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
133 if (PointerType *Pte = dyn_cast<PointerType>(PTy->getElementType()))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
134 if (Pte->getElementType()->isIntegerTy(8))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 if (PointerType *PTy1 = dyn_cast<PointerType>(A1->getType())) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
136 Type *ETy1 = PTy1->getElementType();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 // Second argument is i8*
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138 if (ETy1->isIntegerTy(8))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 return StringSwitch<InstructionClass>(F->getName())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140 .Case("objc_storeWeak", IC_StoreWeak)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141 .Case("objc_initWeak", IC_InitWeak)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 .Case("objc_storeStrong", IC_StoreStrong)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 .Default(IC_CallOrUser);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 // Second argument is i8**.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 if (PointerType *Pte1 = dyn_cast<PointerType>(ETy1))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146 if (Pte1->getElementType()->isIntegerTy(8))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147 return StringSwitch<InstructionClass>(F->getName())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 .Case("objc_moveWeak", IC_MoveWeak)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149 .Case("objc_copyWeak", IC_CopyWeak)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 // Ignore annotation calls. This is important to stop the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 // optimizer from treating annotations as uses which would
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 // make the state of the pointers they are attempting to
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153 // elucidate to be incorrect.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 .Case("llvm.arc.annotation.topdown.bbstart", IC_None)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 .Case("llvm.arc.annotation.topdown.bbend", IC_None)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 .Case("llvm.arc.annotation.bottomup.bbstart", IC_None)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 .Case("llvm.arc.annotation.bottomup.bbend", IC_None)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 .Default(IC_CallOrUser);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 // Anything else.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 return IC_CallOrUser;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165 /// \brief Determine what kind of construct V is.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
166 InstructionClass
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
167 llvm::objcarc::GetInstructionClass(const Value *V) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
168 if (const Instruction *I = dyn_cast<Instruction>(V)) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 // Any instruction other than bitcast and gep with a pointer operand have a
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
170 // use of an objc pointer. Bitcasts, GEPs, Selects, PHIs transfer a pointer
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
171 // to a subsequent use, rather than using it themselves, in this sense.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 // As a short cut, several other opcodes are known to have no pointer
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 // operands of interest. And ret is never followed by a release, so it's
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174 // not interesting to examine.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 switch (I->getOpcode()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
176 case Instruction::Call: {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 const CallInst *CI = cast<CallInst>(I);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 // Check for calls to special functions.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
179 if (const Function *F = CI->getCalledFunction()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
180 InstructionClass Class = GetFunctionClass(F);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
181 if (Class != IC_CallOrUser)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 return Class;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 // None of the intrinsic functions do objc_release. For intrinsics, the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 // only question is whether or not they may be users.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 switch (F->getIntrinsicID()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187 case Intrinsic::returnaddress: case Intrinsic::frameaddress:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 case Intrinsic::stacksave: case Intrinsic::stackrestore:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 case Intrinsic::vastart: case Intrinsic::vacopy: case Intrinsic::vaend:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 case Intrinsic::objectsize: case Intrinsic::prefetch:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 case Intrinsic::stackprotector:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
192 case Intrinsic::eh_return_i32: case Intrinsic::eh_return_i64:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
193 case Intrinsic::eh_typeid_for: case Intrinsic::eh_dwarf_cfa:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
194 case Intrinsic::eh_sjlj_lsda: case Intrinsic::eh_sjlj_functioncontext:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 case Intrinsic::init_trampoline: case Intrinsic::adjust_trampoline:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
196 case Intrinsic::lifetime_start: case Intrinsic::lifetime_end:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
197 case Intrinsic::invariant_start: case Intrinsic::invariant_end:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
198 // Don't let dbg info affect our results.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
199 case Intrinsic::dbg_declare: case Intrinsic::dbg_value:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
200 // Short cut: Some intrinsics obviously don't use ObjC pointers.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
201 return IC_None;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 default:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 break;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
204 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
205 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 return GetCallSiteClass(CI);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208 case Instruction::Invoke:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
209 return GetCallSiteClass(cast<InvokeInst>(I));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
210 case Instruction::BitCast:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 case Instruction::GetElementPtr:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 case Instruction::Select: case Instruction::PHI:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 case Instruction::Ret: case Instruction::Br:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 case Instruction::Switch: case Instruction::IndirectBr:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
215 case Instruction::Alloca: case Instruction::VAArg:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
216 case Instruction::Add: case Instruction::FAdd:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
217 case Instruction::Sub: case Instruction::FSub:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
218 case Instruction::Mul: case Instruction::FMul:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
219 case Instruction::SDiv: case Instruction::UDiv: case Instruction::FDiv:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
220 case Instruction::SRem: case Instruction::URem: case Instruction::FRem:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
221 case Instruction::Shl: case Instruction::LShr: case Instruction::AShr:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
222 case Instruction::And: case Instruction::Or: case Instruction::Xor:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
223 case Instruction::SExt: case Instruction::ZExt: case Instruction::Trunc:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
224 case Instruction::IntToPtr: case Instruction::FCmp:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
225 case Instruction::FPTrunc: case Instruction::FPExt:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 case Instruction::FPToUI: case Instruction::FPToSI:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
227 case Instruction::UIToFP: case Instruction::SIToFP:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
228 case Instruction::InsertElement: case Instruction::ExtractElement:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
229 case Instruction::ShuffleVector:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
230 case Instruction::ExtractValue:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
231 break;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
232 case Instruction::ICmp:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
233 // Comparing a pointer with null, or any other constant, isn't an
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
234 // interesting use, because we don't care what the pointer points to, or
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 // about the values of any other dynamic reference-counted pointers.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
236 if (IsPotentialRetainableObjPtr(I->getOperand(1)))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
237 return IC_User;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
238 break;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 default:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
240 // For anything else, check all the operands.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 // Note that this includes both operands of a Store: while the first
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 // operand isn't actually being dereferenced, it is being stored to
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
243 // memory where we can no longer track who might read it and dereference
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
244 // it, so we have to consider it potentially used.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
245 for (User::const_op_iterator OI = I->op_begin(), OE = I->op_end();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
246 OI != OE; ++OI)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
247 if (IsPotentialRetainableObjPtr(*OI))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
248 return IC_User;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
249 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
250 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
251
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
252 // Otherwise, it's totally inert for ARC purposes.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
253 return IC_None;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254 }