1 //===- llvm/TextAPI/Symbol.h - TAPI Symbol ----------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #ifndef LLVM_TEXTAPI_SYMBOL_H
10 #define LLVM_TEXTAPI_SYMBOL_H
11
12 #include "llvm/ADT/BitmaskEnum.h"
13 #include "llvm/ADT/StringRef.h"
14 #include "llvm/Support/raw_ostream.h"
15 #include "llvm/TextAPI/ArchitectureSet.h"
16 #include "llvm/TextAPI/Target.h"
17
18 namespace llvm {
19 namespace MachO {
20
21 // clang-format off
22
23 /// Symbol flags.
24 enum class SymbolFlags : uint8_t {
25 /// No flags
26 None = 0,
27
28 /// Thread-local value symbol
29 ThreadLocalValue = 1U << 0,
30
31 /// Weak defined symbol
32 WeakDefined = 1U << 1,
33
34 /// Weak referenced symbol
35 WeakReferenced = 1U << 2,
36
37 /// Undefined
38 Undefined = 1U << 3,
39
40 /// Rexported
41 Rexported = 1U << 4,
42
43 /// Data Segment
44 Data = 1U << 5,
45
46 /// Text Segment
47 Text = 1U << 6,
48
49 LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/Text),
50 };
51
52 // clang-format on
53
54 /// Mapping of entry types in TextStubs.
55 enum class EncodeKind : uint8_t {
56 GlobalSymbol,
57 ObjectiveCClass,
58 ObjectiveCClassEHType,
59 ObjectiveCInstanceVariable,
60 };
61
62 constexpr StringLiteral ObjC1ClassNamePrefix = ".objc_class_name_";
63 constexpr StringLiteral ObjC2ClassNamePrefix = "_OBJC_CLASS_$_";
64 constexpr StringLiteral ObjC2MetaClassNamePrefix = "_OBJC_METACLASS_$_";
65 constexpr StringLiteral ObjC2EHTypePrefix = "_OBJC_EHTYPE_$_";
66 constexpr StringLiteral ObjC2IVarPrefix = "_OBJC_IVAR_$_";
67
68 /// ObjC Interface symbol mappings.
69 enum class ObjCIFSymbolKind : uint8_t {
70 None = 0,
71 /// Is OBJC_CLASS* symbol.
72 Class = 1U << 0,
73 /// Is OBJC_METACLASS* symbol.
74 MetaClass = 1U << 1,
75 /// Is OBJC_EHTYPE* symbol.
76 EHType = 1U << 2,
77
78 LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/EHType),
79 };
80
81 using TargetList = SmallVector<Target, 5>;
82
83 // Keep containers that hold Targets in sorted order and uniqued.
84 template <typename C>
addEntry(C & Container,const Target & Targ)85 typename C::iterator addEntry(C &Container, const Target &Targ) {
86 auto Iter =
87 lower_bound(Container, Targ, [](const Target &LHS, const Target &RHS) {
88 return LHS < RHS;
89 });
90 if ((Iter != std::end(Container)) && !(Targ < *Iter))
91 return Iter;
92
93 return Container.insert(Iter, Targ);
94 }
95
96 class Symbol {
97 public:
Symbol(EncodeKind Kind,StringRef Name,TargetList Targets,SymbolFlags Flags)98 Symbol(EncodeKind Kind, StringRef Name, TargetList Targets, SymbolFlags Flags)
99 : Name(Name), Targets(std::move(Targets)), Kind(Kind), Flags(Flags) {}
100
addTarget(Target InputTarget)101 void addTarget(Target InputTarget) { addEntry(Targets, InputTarget); }
getKind()102 EncodeKind getKind() const { return Kind; }
getName()103 StringRef getName() const { return Name; }
getArchitectures()104 ArchitectureSet getArchitectures() const {
105 return mapToArchitectureSet(Targets);
106 }
getFlags()107 SymbolFlags getFlags() const { return Flags; }
108
isWeakDefined()109 bool isWeakDefined() const {
110 return (Flags & SymbolFlags::WeakDefined) == SymbolFlags::WeakDefined;
111 }
112
isWeakReferenced()113 bool isWeakReferenced() const {
114 return (Flags & SymbolFlags::WeakReferenced) == SymbolFlags::WeakReferenced;
115 }
116
isThreadLocalValue()117 bool isThreadLocalValue() const {
118 return (Flags & SymbolFlags::ThreadLocalValue) ==
119 SymbolFlags::ThreadLocalValue;
120 }
121
isUndefined()122 bool isUndefined() const {
123 return (Flags & SymbolFlags::Undefined) == SymbolFlags::Undefined;
124 }
125
isReexported()126 bool isReexported() const {
127 return (Flags & SymbolFlags::Rexported) == SymbolFlags::Rexported;
128 }
129
isData()130 bool isData() const {
131 return (Flags & SymbolFlags::Data) == SymbolFlags::Data;
132 }
133
isText()134 bool isText() const {
135 return (Flags & SymbolFlags::Text) == SymbolFlags::Text;
136 }
137
hasArchitecture(Architecture Arch)138 bool hasArchitecture(Architecture Arch) const {
139 return mapToArchitectureSet(Targets).contains(Arch);
140 }
141
hasTarget(const Target & Targ)142 bool hasTarget(const Target &Targ) const {
143 return llvm::is_contained(Targets, Targ);
144 }
145
146 using const_target_iterator = TargetList::const_iterator;
147 using const_target_range = llvm::iterator_range<const_target_iterator>;
targets()148 const_target_range targets() const { return {Targets}; }
149
150 using const_filtered_target_iterator =
151 llvm::filter_iterator<const_target_iterator,
152 std::function<bool(const Target &)>>;
153 using const_filtered_target_range =
154 llvm::iterator_range<const_filtered_target_iterator>;
155 const_filtered_target_range targets(ArchitectureSet architectures) const;
156
157 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
158 void dump(raw_ostream &OS) const;
dump()159 void dump() const { dump(llvm::errs()); }
160 #endif
161
162 bool operator==(const Symbol &O) const;
163
164 bool operator!=(const Symbol &O) const { return !(*this == O); }
165
166 bool operator<(const Symbol &O) const {
167 return std::tie(Kind, Name) < std::tie(O.Kind, O.Name);
168 }
169
170 private:
171 StringRef Name;
172 TargetList Targets;
173 EncodeKind Kind;
174 SymbolFlags Flags;
175 };
176
177 /// Lightweight struct for passing around symbol information.
178 struct SimpleSymbol {
179 StringRef Name;
180 EncodeKind Kind;
181 ObjCIFSymbolKind ObjCInterfaceType;
182
183 bool operator<(const SimpleSymbol &O) const {
184 return std::tie(Name, Kind, ObjCInterfaceType) <
185 std::tie(O.Name, O.Kind, O.ObjCInterfaceType);
186 }
187 };
188
189 /// Get symbol classification by parsing the name of a symbol.
190 ///
191 /// \param SymName The name of symbol.
192 SimpleSymbol parseSymbol(StringRef SymName);
193
194 } // end namespace MachO.
195 } // end namespace llvm.
196
197 #endif // LLVM_TEXTAPI_SYMBOL_H
198