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annotate include/llvm/Analysis/ObjCARCInstKind.h @ 120:1172e4bd9c6f

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update 4.0.0
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1 //===- ObjCARCInstKind.h - ARC instruction equivalence classes --*- C++ -*-===//
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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 #ifndef LLVM_ANALYSIS_OBJCARCINSTKIND_H
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11 #define LLVM_ANALYSIS_OBJCARCINSTKIND_H
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12
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13 #include "llvm/IR/Instructions.h"
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14 #include "llvm/IR/Function.h"
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15
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16 namespace llvm {
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17 namespace objcarc {
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18
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19 /// \enum ARCInstKind
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20 ///
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21 /// \brief Equivalence classes of instructions in the ARC Model.
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22 ///
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23 /// Since we do not have "instructions" to represent ARC concepts in LLVM IR,
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24 /// we instead operate on equivalence classes of instructions.
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25 ///
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26 /// TODO: This should be split into two enums: a runtime entry point enum
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27 /// (possibly united with the ARCRuntimeEntrypoint class) and an enum that deals
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28 /// with effects of instructions in the ARC model (which would handle the notion
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29 /// of a User or CallOrUser).
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30 enum class ARCInstKind {
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31 Retain, ///< objc_retain
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32 RetainRV, ///< objc_retainAutoreleasedReturnValue
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33 ClaimRV, ///< objc_unsafeClaimAutoreleasedReturnValue
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34 RetainBlock, ///< objc_retainBlock
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35 Release, ///< objc_release
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36 Autorelease, ///< objc_autorelease
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37 AutoreleaseRV, ///< objc_autoreleaseReturnValue
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38 AutoreleasepoolPush, ///< objc_autoreleasePoolPush
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39 AutoreleasepoolPop, ///< objc_autoreleasePoolPop
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40 NoopCast, ///< objc_retainedObject, etc.
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41 FusedRetainAutorelease, ///< objc_retainAutorelease
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42 FusedRetainAutoreleaseRV, ///< objc_retainAutoreleaseReturnValue
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43 LoadWeakRetained, ///< objc_loadWeakRetained (primitive)
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44 StoreWeak, ///< objc_storeWeak (primitive)
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45 InitWeak, ///< objc_initWeak (derived)
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46 LoadWeak, ///< objc_loadWeak (derived)
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47 MoveWeak, ///< objc_moveWeak (derived)
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48 CopyWeak, ///< objc_copyWeak (derived)
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49 DestroyWeak, ///< objc_destroyWeak (derived)
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50 StoreStrong, ///< objc_storeStrong (derived)
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51 IntrinsicUser, ///< clang.arc.use
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52 CallOrUser, ///< could call objc_release and/or "use" pointers
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53 Call, ///< could call objc_release
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54 User, ///< could "use" a pointer
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55 None ///< anything that is inert from an ARC perspective.
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56 };
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57
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58 raw_ostream &operator<<(raw_ostream &OS, const ARCInstKind Class);
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59
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60 /// \brief Test if the given class is a kind of user.
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61 bool IsUser(ARCInstKind Class);
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62
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63 /// \brief Test if the given class is objc_retain or equivalent.
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64 bool IsRetain(ARCInstKind Class);
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65
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66 /// \brief Test if the given class is objc_autorelease or equivalent.
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67 bool IsAutorelease(ARCInstKind Class);
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68
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69 /// \brief Test if the given class represents instructions which return their
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70 /// argument verbatim.
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71 bool IsForwarding(ARCInstKind Class);
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72
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73 /// \brief Test if the given class represents instructions which do nothing if
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74 /// passed a null pointer.
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75 bool IsNoopOnNull(ARCInstKind Class);
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76
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77 /// \brief Test if the given class represents instructions which are always safe
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78 /// to mark with the "tail" keyword.
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79 bool IsAlwaysTail(ARCInstKind Class);
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80
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81 /// \brief Test if the given class represents instructions which are never safe
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82 /// to mark with the "tail" keyword.
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83 bool IsNeverTail(ARCInstKind Class);
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84
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85 /// \brief Test if the given class represents instructions which are always safe
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86 /// to mark with the nounwind attribute.
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87 bool IsNoThrow(ARCInstKind Class);
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88
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89 /// Test whether the given instruction can autorelease any pointer or cause an
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90 /// autoreleasepool pop.
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91 bool CanInterruptRV(ARCInstKind Class);
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92
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93 /// \brief Determine if F is one of the special known Functions. If it isn't,
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94 /// return ARCInstKind::CallOrUser.
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95 ARCInstKind GetFunctionClass(const Function *F);
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96
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97 /// \brief Determine which objc runtime call instruction class V belongs to.
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98 ///
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99 /// This is similar to GetARCInstKind except that it only detects objc
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100 /// runtime calls. This allows it to be faster.
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101 ///
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102 inline ARCInstKind GetBasicARCInstKind(const Value *V) {
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103 if (const CallInst *CI = dyn_cast<CallInst>(V)) {
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104 if (const Function *F = CI->getCalledFunction())
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105 return GetFunctionClass(F);
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106 // Otherwise, be conservative.
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107 return ARCInstKind::CallOrUser;
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108 }
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109
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110 // Otherwise, be conservative.
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111 return isa<InvokeInst>(V) ? ARCInstKind::CallOrUser : ARCInstKind::User;
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112 }
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113
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114 /// Map V to its ARCInstKind equivalence class.
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115 ARCInstKind GetARCInstKind(const Value *V);
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116
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117 /// Returns false if conservatively we can prove that any instruction mapped to
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118 /// this kind can not decrement ref counts. Returns true otherwise.
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119 bool CanDecrementRefCount(ARCInstKind Kind);
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120
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121 } // end namespace objcarc
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122 } // end namespace llvm
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123
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124 #endif