1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
//===- ARCRuntimeEntryPoints.h - ObjC ARC Optimization --*- C++ -*---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
/// This file contains a class ARCRuntimeEntryPoints for use in
/// creating/managing references to entry points to the arc objective c runtime.
///
/// WARNING: This file knows about certain library functions. It recognizes them
/// by name, and hardwires knowledge of their semantics.
///
/// WARNING: This file knows about how certain Objective-C library functions are
/// used. Naive LLVM IR transformations which would otherwise be
/// behavior-preserving may break these assumptions.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TRANSFORMS_OBJCARC_ARCRUNTIMEENTRYPOINTS_H
#define LLVM_LIB_TRANSFORMS_OBJCARC_ARCRUNTIMEENTRYPOINTS_H
#include "ObjCARC.h"
namespace llvm {
namespace objcarc {
enum class ARCRuntimeEntryPointKind {
AutoreleaseRV,
Release,
Retain,
RetainBlock,
Autorelease,
StoreStrong,
RetainRV,
RetainAutorelease,
RetainAutoreleaseRV,
};
/// Declarations for ObjC runtime functions and constants. These are initialized
/// lazily to avoid cluttering up the Module with unused declarations.
class ARCRuntimeEntryPoints {
public:
ARCRuntimeEntryPoints() : TheModule(nullptr),
AutoreleaseRV(nullptr),
Release(nullptr),
Retain(nullptr),
RetainBlock(nullptr),
Autorelease(nullptr),
StoreStrong(nullptr),
RetainRV(nullptr),
RetainAutorelease(nullptr),
RetainAutoreleaseRV(nullptr) { }
~ARCRuntimeEntryPoints() { }
void init(Module *M) {
TheModule = M;
AutoreleaseRV = nullptr;
Release = nullptr;
Retain = nullptr;
RetainBlock = nullptr;
Autorelease = nullptr;
StoreStrong = nullptr;
RetainRV = nullptr;
RetainAutorelease = nullptr;
RetainAutoreleaseRV = nullptr;
}
Constant *get(ARCRuntimeEntryPointKind kind) {
assert(TheModule != nullptr && "Not initialized.");
switch (kind) {
case ARCRuntimeEntryPointKind::AutoreleaseRV:
return getI8XRetI8XEntryPoint(AutoreleaseRV,
"objc_autoreleaseReturnValue", true);
case ARCRuntimeEntryPointKind::Release:
return getVoidRetI8XEntryPoint(Release, "objc_release");
case ARCRuntimeEntryPointKind::Retain:
return getI8XRetI8XEntryPoint(Retain, "objc_retain", true);
case ARCRuntimeEntryPointKind::RetainBlock:
return getI8XRetI8XEntryPoint(RetainBlock, "objc_retainBlock", false);
case ARCRuntimeEntryPointKind::Autorelease:
return getI8XRetI8XEntryPoint(Autorelease, "objc_autorelease", true);
case ARCRuntimeEntryPointKind::StoreStrong:
return getI8XRetI8XXI8XEntryPoint(StoreStrong, "objc_storeStrong");
case ARCRuntimeEntryPointKind::RetainRV:
return getI8XRetI8XEntryPoint(RetainRV,
"objc_retainAutoreleasedReturnValue", true);
case ARCRuntimeEntryPointKind::RetainAutorelease:
return getI8XRetI8XEntryPoint(RetainAutorelease, "objc_retainAutorelease",
true);
case ARCRuntimeEntryPointKind::RetainAutoreleaseRV:
return getI8XRetI8XEntryPoint(RetainAutoreleaseRV,
"objc_retainAutoreleaseReturnValue", true);
}
llvm_unreachable("Switch should be a covered switch.");
}
private:
/// Cached reference to the module which we will insert declarations into.
Module *TheModule;
/// Declaration for ObjC runtime function objc_autoreleaseReturnValue.
Constant *AutoreleaseRV;
/// Declaration for ObjC runtime function objc_release.
Constant *Release;
/// Declaration for ObjC runtime function objc_retain.
Constant *Retain;
/// Declaration for ObjC runtime function objc_retainBlock.
Constant *RetainBlock;
/// Declaration for ObjC runtime function objc_autorelease.
Constant *Autorelease;
/// Declaration for objc_storeStrong().
Constant *StoreStrong;
/// Declaration for objc_retainAutoreleasedReturnValue().
Constant *RetainRV;
/// Declaration for objc_retainAutorelease().
Constant *RetainAutorelease;
/// Declaration for objc_retainAutoreleaseReturnValue().
Constant *RetainAutoreleaseRV;
Constant *getVoidRetI8XEntryPoint(Constant *&Decl,
const char *Name) {
if (Decl)
return Decl;
LLVMContext &C = TheModule->getContext();
Type *Params[] = { PointerType::getUnqual(Type::getInt8Ty(C)) };
AttributeSet Attr =
AttributeSet().addAttribute(C, AttributeSet::FunctionIndex,
Attribute::NoUnwind);
FunctionType *Fty = FunctionType::get(Type::getVoidTy(C), Params,
/*isVarArg=*/false);
return Decl = TheModule->getOrInsertFunction(Name, Fty, Attr);
}
Constant *getI8XRetI8XEntryPoint(Constant *& Decl,
const char *Name,
bool NoUnwind = false) {
if (Decl)
return Decl;
LLVMContext &C = TheModule->getContext();
Type *I8X = PointerType::getUnqual(Type::getInt8Ty(C));
Type *Params[] = { I8X };
FunctionType *Fty = FunctionType::get(I8X, Params, /*isVarArg=*/false);
AttributeSet Attr = AttributeSet();
if (NoUnwind)
Attr = Attr.addAttribute(C, AttributeSet::FunctionIndex,
Attribute::NoUnwind);
return Decl = TheModule->getOrInsertFunction(Name, Fty, Attr);
}
Constant *getI8XRetI8XXI8XEntryPoint(Constant *&Decl,
const char *Name) {
if (Decl)
return Decl;
LLVMContext &C = TheModule->getContext();
Type *I8X = PointerType::getUnqual(Type::getInt8Ty(C));
Type *I8XX = PointerType::getUnqual(I8X);
Type *Params[] = { I8XX, I8X };
AttributeSet Attr =
AttributeSet().addAttribute(C, AttributeSet::FunctionIndex,
Attribute::NoUnwind);
Attr = Attr.addAttribute(C, 1, Attribute::NoCapture);
FunctionType *Fty = FunctionType::get(Type::getVoidTy(C), Params,
/*isVarArg=*/false);
return Decl = TheModule->getOrInsertFunction(Name, Fty, Attr);
}
}; // class ARCRuntimeEntryPoints
} // namespace objcarc
} // namespace llvm
#endif
|
