1 //===- ObjCARCUtil.h - ObjC ARC Optimization ----------*- mode: c++ -*-----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 /// This file defines several utility functions used by various ARC
11 /// optimizations which are IMHO too big to be in a header file.
13 /// WARNING: This file knows about certain library functions. It recognizes them
14 /// by name, and hardwires knowledge of their semantics.
16 /// WARNING: This file knows about how certain Objective-C library functions are
17 /// used. Naive LLVM IR transformations which would otherwise be
18 /// behavior-preserving may break these assumptions.
20 //===----------------------------------------------------------------------===//
25 using namespace llvm::objcarc;
27 raw_ostream &llvm::objcarc::operator<<(raw_ostream &OS,
28 const InstructionClass Class) {
31 return OS << "IC_Retain";
33 return OS << "IC_RetainRV";
35 return OS << "IC_RetainBlock";
37 return OS << "IC_Release";
39 return OS << "IC_Autorelease";
40 case IC_AutoreleaseRV:
41 return OS << "IC_AutoreleaseRV";
42 case IC_AutoreleasepoolPush:
43 return OS << "IC_AutoreleasepoolPush";
44 case IC_AutoreleasepoolPop:
45 return OS << "IC_AutoreleasepoolPop";
47 return OS << "IC_NoopCast";
48 case IC_FusedRetainAutorelease:
49 return OS << "IC_FusedRetainAutorelease";
50 case IC_FusedRetainAutoreleaseRV:
51 return OS << "IC_FusedRetainAutoreleaseRV";
52 case IC_LoadWeakRetained:
53 return OS << "IC_LoadWeakRetained";
55 return OS << "IC_StoreWeak";
57 return OS << "IC_InitWeak";
59 return OS << "IC_LoadWeak";
61 return OS << "IC_MoveWeak";
63 return OS << "IC_CopyWeak";
65 return OS << "IC_DestroyWeak";
67 return OS << "IC_StoreStrong";
69 return OS << "IC_CallOrUser";
71 return OS << "IC_Call";
73 return OS << "IC_User";
75 return OS << "IC_None";
77 llvm_unreachable("Unknown instruction class!");
80 InstructionClass llvm::objcarc::GetFunctionClass(const Function *F) {
81 Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
85 return StringSwitch<InstructionClass>(F->getName())
86 .Case("objc_autoreleasePoolPush", IC_AutoreleasepoolPush)
87 .Default(IC_CallOrUser);
90 const Argument *A0 = AI++;
92 // Argument is a pointer.
93 if (PointerType *PTy = dyn_cast<PointerType>(A0->getType())) {
94 Type *ETy = PTy->getElementType();
96 if (ETy->isIntegerTy(8))
97 return StringSwitch<InstructionClass>(F->getName())
98 .Case("objc_retain", IC_Retain)
99 .Case("objc_retainAutoreleasedReturnValue", IC_RetainRV)
100 .Case("objc_retainBlock", IC_RetainBlock)
101 .Case("objc_release", IC_Release)
102 .Case("objc_autorelease", IC_Autorelease)
103 .Case("objc_autoreleaseReturnValue", IC_AutoreleaseRV)
104 .Case("objc_autoreleasePoolPop", IC_AutoreleasepoolPop)
105 .Case("objc_retainedObject", IC_NoopCast)
106 .Case("objc_unretainedObject", IC_NoopCast)
107 .Case("objc_unretainedPointer", IC_NoopCast)
108 .Case("objc_retain_autorelease", IC_FusedRetainAutorelease)
109 .Case("objc_retainAutorelease", IC_FusedRetainAutorelease)
110 .Case("objc_retainAutoreleaseReturnValue",IC_FusedRetainAutoreleaseRV)
111 .Default(IC_CallOrUser);
114 if (PointerType *Pte = dyn_cast<PointerType>(ETy))
115 if (Pte->getElementType()->isIntegerTy(8))
116 return StringSwitch<InstructionClass>(F->getName())
117 .Case("objc_loadWeakRetained", IC_LoadWeakRetained)
118 .Case("objc_loadWeak", IC_LoadWeak)
119 .Case("objc_destroyWeak", IC_DestroyWeak)
120 .Default(IC_CallOrUser);
123 // Two arguments, first is i8**.
124 const Argument *A1 = AI++;
126 if (PointerType *PTy = dyn_cast<PointerType>(A0->getType()))
127 if (PointerType *Pte = dyn_cast<PointerType>(PTy->getElementType()))
128 if (Pte->getElementType()->isIntegerTy(8))
129 if (PointerType *PTy1 = dyn_cast<PointerType>(A1->getType())) {
130 Type *ETy1 = PTy1->getElementType();
131 // Second argument is i8*
132 if (ETy1->isIntegerTy(8))
133 return StringSwitch<InstructionClass>(F->getName())
134 .Case("objc_storeWeak", IC_StoreWeak)
135 .Case("objc_initWeak", IC_InitWeak)
136 .Case("objc_storeStrong", IC_StoreStrong)
137 .Default(IC_CallOrUser);
138 // Second argument is i8**.
139 if (PointerType *Pte1 = dyn_cast<PointerType>(ETy1))
140 if (Pte1->getElementType()->isIntegerTy(8))
141 return StringSwitch<InstructionClass>(F->getName())
142 .Case("objc_moveWeak", IC_MoveWeak)
143 .Case("objc_copyWeak", IC_CopyWeak)
144 .Default(IC_CallOrUser);
148 return IC_CallOrUser;