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1 //===---- lib/ReaderWriter/MachO/SectCreateFile.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_SECTCREATE_FILE_H
10 #define LLD_READER_WRITER_MACHO_SECTCREATE_FILE_H
11 
12 #include "lld/Core/DefinedAtom.h"
13 #include "lld/Core/Simple.h"
14 #include "lld/ReaderWriter/MachOLinkingContext.h"
15 
16 namespace lld {
17 namespace mach_o {
18 
19 //
20 // A FlateNamespaceFile instance may be added as a resolution source of last
21 // resort, depending on how -flat_namespace and -undefined are set.
22 //
23 class SectCreateFile : public File {
24 public:
25   class SectCreateAtom : public SimpleDefinedAtom {
26   public:
SectCreateAtom(const File & file,StringRef segName,StringRef sectName,std::unique_ptr<MemoryBuffer> content)27     SectCreateAtom(const File &file, StringRef segName, StringRef sectName,
28                    std::unique_ptr<MemoryBuffer> content)
29       : SimpleDefinedAtom(file),
30         _combinedName((segName + "/" + sectName).str()),
31         _content(std::move(content)) {}
32 
33     ~SectCreateAtom() override = default;
34 
size()35     uint64_t size() const override { return _content->getBufferSize(); }
36 
scope()37     Scope scope() const override { return scopeGlobal; }
38 
contentType()39     ContentType contentType() const override { return typeSectCreate; }
40 
sectionChoice()41     SectionChoice sectionChoice() const override { return sectionCustomRequired; }
42 
customSectionName()43     StringRef customSectionName() const override { return _combinedName; }
44 
deadStrip()45     DeadStripKind deadStrip() const override { return deadStripNever; }
46 
rawContent()47     ArrayRef<uint8_t> rawContent() const override {
48       const uint8_t *data =
49         reinterpret_cast<const uint8_t*>(_content->getBufferStart());
50       return ArrayRef<uint8_t>(data, _content->getBufferSize());
51     }
52 
segmentName()53     StringRef segmentName() const { return _segName; }
sectionName()54     StringRef sectionName() const { return _sectName; }
55 
56   private:
57     std::string _combinedName;
58     StringRef _segName;
59     StringRef _sectName;
60     std::unique_ptr<MemoryBuffer> _content;
61   };
62 
SectCreateFile()63   SectCreateFile() : File("sectcreate", kindSectCreateObject) {}
64 
addSection(StringRef seg,StringRef sect,std::unique_ptr<MemoryBuffer> content)65   void addSection(StringRef seg, StringRef sect,
66                   std::unique_ptr<MemoryBuffer> content) {
67     _definedAtoms.push_back(
68       new (allocator()) SectCreateAtom(*this, seg, sect, std::move(content)));
69   }
70 
defined()71   const AtomRange<DefinedAtom> defined() const override {
72     return _definedAtoms;
73   }
74 
undefined()75   const AtomRange<UndefinedAtom> undefined() const override {
76     return _noUndefinedAtoms;
77   }
78 
sharedLibrary()79   const AtomRange<SharedLibraryAtom> sharedLibrary() const override {
80     return _noSharedLibraryAtoms;
81   }
82 
absolute()83   const AtomRange<AbsoluteAtom> absolute() const override {
84     return _noAbsoluteAtoms;
85   }
86 
clearAtoms()87   void clearAtoms() override {
88     _definedAtoms.clear();
89     _noUndefinedAtoms.clear();
90     _noSharedLibraryAtoms.clear();
91     _noAbsoluteAtoms.clear();
92   }
93 
94 private:
95   AtomVector<DefinedAtom> _definedAtoms;
96 };
97 
98 } // namespace mach_o
99 } // namespace lld
100 
101 #endif // LLD_READER_WRITER_MACHO_SECTCREATE_FILE_H
102