/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/tools/lld/lib/ReaderWriter/MachO/Atoms.h
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1 | | //===- lib/ReaderWriter/MachO/Atoms.h ---------------------------*- 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 LLD_READER_WRITER_MACHO_ATOMS_H |
10 | | #define LLD_READER_WRITER_MACHO_ATOMS_H |
11 | | |
12 | | #include "lld/Core/Atom.h" |
13 | | #include "lld/Core/DefinedAtom.h" |
14 | | #include "lld/Core/SharedLibraryAtom.h" |
15 | | #include "lld/Core/Simple.h" |
16 | | #include "llvm/ADT/ArrayRef.h" |
17 | | #include "llvm/ADT/StringRef.h" |
18 | | #include <cstdint> |
19 | | #include <string> |
20 | | |
21 | | namespace lld { |
22 | | |
23 | | class File; |
24 | | |
25 | | namespace mach_o { |
26 | | |
27 | | class MachODefinedAtom : public SimpleDefinedAtom { |
28 | | public: |
29 | | MachODefinedAtom(const File &f, const StringRef name, Scope scope, |
30 | | ContentType type, Merge merge, bool thumb, bool noDeadStrip, |
31 | | const ArrayRef<uint8_t> content, Alignment align) |
32 | | : SimpleDefinedAtom(f), _name(name), _content(content), |
33 | | _align(align), _contentType(type), _scope(scope), _merge(merge), |
34 | 696 | _thumb(thumb), _noDeadStrip(noDeadStrip) {} |
35 | | |
36 | | // Constructor for zero-fill content |
37 | | MachODefinedAtom(const File &f, const StringRef name, Scope scope, |
38 | | ContentType type, uint64_t size, bool noDeadStrip, |
39 | | Alignment align) |
40 | | : SimpleDefinedAtom(f), _name(name), |
41 | | _content(ArrayRef<uint8_t>(nullptr, size)), _align(align), |
42 | | _contentType(type), _scope(scope), _merge(mergeNo), _thumb(false), |
43 | 3 | _noDeadStrip(noDeadStrip) {} |
44 | | |
45 | 699 | ~MachODefinedAtom() override = default; |
46 | | |
47 | 1.94k | uint64_t size() const override { return _content.size(); } |
48 | | |
49 | 9.07k | ContentType contentType() const override { return _contentType; } |
50 | | |
51 | 698 | Alignment alignment() const override { return _align; } |
52 | | |
53 | 4.34k | StringRef name() const override { return _name; } |
54 | | |
55 | 1.48k | Scope scope() const override { return _scope; } |
56 | | |
57 | 1.42k | Merge merge() const override { return _merge; } |
58 | | |
59 | 703 | DeadStripKind deadStrip() const override { |
60 | 703 | if (_contentType == DefinedAtom::typeInitializerPtr) |
61 | 4 | return deadStripNever; |
62 | 699 | if (_contentType == DefinedAtom::typeTerminatorPtr) |
63 | 2 | return deadStripNever; |
64 | 697 | if (_noDeadStrip) |
65 | 169 | return deadStripNever; |
66 | 528 | return deadStripNormal; |
67 | 528 | } |
68 | | |
69 | 3.46k | ArrayRef<uint8_t> rawContent() const override { |
70 | 3.46k | // Note: Zerofill atoms have a content pointer which is null. |
71 | 3.46k | return _content; |
72 | 3.46k | } |
73 | | |
74 | 61 | bool isThumb() const { return _thumb; } |
75 | | |
76 | | private: |
77 | | const StringRef _name; |
78 | | const ArrayRef<uint8_t> _content; |
79 | | const DefinedAtom::Alignment _align; |
80 | | const ContentType _contentType; |
81 | | const Scope _scope; |
82 | | const Merge _merge; |
83 | | const bool _thumb; |
84 | | const bool _noDeadStrip; |
85 | | }; |
86 | | |
87 | | class MachODefinedCustomSectionAtom : public MachODefinedAtom { |
88 | | public: |
89 | | MachODefinedCustomSectionAtom(const File &f, const StringRef name, |
90 | | Scope scope, ContentType type, Merge merge, |
91 | | bool thumb, bool noDeadStrip, |
92 | | const ArrayRef<uint8_t> content, |
93 | | StringRef sectionName, Alignment align) |
94 | | : MachODefinedAtom(f, name, scope, type, merge, thumb, noDeadStrip, |
95 | | content, align), |
96 | 23 | _sectionName(sectionName) {} |
97 | | |
98 | 23 | ~MachODefinedCustomSectionAtom() override = default; |
99 | | |
100 | 41 | SectionChoice sectionChoice() const override { |
101 | 41 | return DefinedAtom::sectionCustomRequired; |
102 | 41 | } |
103 | | |
104 | 43 | StringRef customSectionName() const override { |
105 | 43 | return _sectionName; |
106 | 43 | } |
107 | | private: |
108 | | StringRef _sectionName; |
109 | | }; |
110 | | |
111 | | class MachOTentativeDefAtom : public SimpleDefinedAtom { |
112 | | public: |
113 | | MachOTentativeDefAtom(const File &f, const StringRef name, Scope scope, |
114 | | uint64_t size, DefinedAtom::Alignment align) |
115 | | : SimpleDefinedAtom(f), _name(name), _scope(scope), _size(size), |
116 | 5 | _align(align) {} |
117 | | |
118 | 5 | ~MachOTentativeDefAtom() override = default; |
119 | | |
120 | 10 | uint64_t size() const override { return _size; } |
121 | | |
122 | 10 | Merge merge() const override { return DefinedAtom::mergeAsTentative; } |
123 | | |
124 | 66 | ContentType contentType() const override { return DefinedAtom::typeZeroFill; } |
125 | | |
126 | 10 | Alignment alignment() const override { return _align; } |
127 | | |
128 | 46 | StringRef name() const override { return _name; } |
129 | | |
130 | 15 | Scope scope() const override { return _scope; } |
131 | | |
132 | 0 | ArrayRef<uint8_t> rawContent() const override { return ArrayRef<uint8_t>(); } |
133 | | |
134 | | private: |
135 | | const std::string _name; |
136 | | const Scope _scope; |
137 | | const uint64_t _size; |
138 | | const DefinedAtom::Alignment _align; |
139 | | }; |
140 | | |
141 | | class MachOSharedLibraryAtom : public SharedLibraryAtom { |
142 | | public: |
143 | | MachOSharedLibraryAtom(const File &file, StringRef name, |
144 | | StringRef dylibInstallName, bool weakDef) |
145 | | : SharedLibraryAtom(), _file(file), _name(name), |
146 | 137 | _dylibInstallName(dylibInstallName) {} |
147 | 137 | ~MachOSharedLibraryAtom() override = default; |
148 | | |
149 | 187 | StringRef loadName() const override { return _dylibInstallName; } |
150 | | |
151 | 39 | bool canBeNullAtRuntime() const override { |
152 | 39 | // FIXME: this may actually be changeable. For now, all symbols are strongly |
153 | 39 | // defined though. |
154 | 39 | return false; |
155 | 39 | } |
156 | | |
157 | 0 | const File &file() const override { return _file; } |
158 | | |
159 | 579 | StringRef name() const override { return _name; } |
160 | | |
161 | 8 | Type type() const override { |
162 | 8 | // Unused in MachO (I think). |
163 | 8 | return Type::Unknown; |
164 | 8 | } |
165 | | |
166 | 8 | uint64_t size() const override { |
167 | 8 | // Unused in MachO (I think) |
168 | 8 | return 0; |
169 | 8 | } |
170 | | |
171 | | private: |
172 | | const File &_file; |
173 | | StringRef _name; |
174 | | StringRef _dylibInstallName; |
175 | | }; |
176 | | |
177 | | } // end namespace mach_o |
178 | | } // end namespace lld |
179 | | |
180 | | #endif // LLD_READER_WRITER_MACHO_ATOMS_H |