1 //===- Object.h -------------------------------------------------*- 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 #ifndef LLVM_OBJCOPY_OBJECT_H
11 #define LLVM_OBJCOPY_OBJECT_H
13 #include "llvm/MC/StringTableBuilder.h"
14 #include "llvm/Object/ELFObjectFile.h"
15 #include "llvm/Support/FileOutputBuffer.h"
25 Segment *ParentSegment = nullptr;
26 uint64_t HeaderOffset;
27 uint64_t OriginalOffset;
32 uint32_t EntrySize = 0;
35 uint64_t Link = llvm::ELF::SHN_UNDEF;
36 uint64_t NameIndex = 0;
39 uint64_t Type = llvm::ELF::SHT_NULL;
41 virtual ~SectionBase() {}
42 virtual void finalize();
43 template <class ELFT> void writeHeader(llvm::FileOutputBuffer &Out) const;
44 virtual void writeSection(llvm::FileOutputBuffer &Out) const = 0;
49 struct SectionCompare {
50 bool operator()(const SectionBase *Lhs, const SectionBase *Rhs) const {
51 // Some sections might have the same address if one of them is empty. To
52 // fix this we can use the lexicographic ordering on ->Addr and the
53 // address of the actully stored section.
54 if (Lhs->OriginalOffset == Rhs->OriginalOffset)
56 return Lhs->OriginalOffset < Rhs->OriginalOffset;
60 std::set<const SectionBase *, SectionCompare> Sections;
61 llvm::ArrayRef<uint8_t> Contents;
74 Segment(llvm::ArrayRef<uint8_t> Data) : Contents(Data) {}
76 const SectionBase *firstSection() const {
77 if (!Sections.empty())
78 return *Sections.begin();
81 void addSection(const SectionBase *sec) { Sections.insert(sec); }
82 template <class ELFT> void writeHeader(llvm::FileOutputBuffer &Out) const;
83 void writeSegment(llvm::FileOutputBuffer &Out) const;
86 class Section : public SectionBase {
88 llvm::ArrayRef<uint8_t> Contents;
91 Section(llvm::ArrayRef<uint8_t> Data) : Contents(Data) {}
92 void writeSection(llvm::FileOutputBuffer &Out) const override;
95 // This is just a wraper around a StringTableBuilder that implements SectionBase
96 class StringTableSection : public SectionBase {
98 llvm::StringTableBuilder StrTabBuilder;
101 StringTableSection() : StrTabBuilder(llvm::StringTableBuilder::ELF) {
102 Type = llvm::ELF::SHT_STRTAB;
105 void addString(llvm::StringRef Name);
106 uint32_t findIndex(llvm::StringRef Name) const;
107 void finalize() override;
108 void writeSection(llvm::FileOutputBuffer &Out) const override;
109 static bool classof(const SectionBase *S) {
110 return S->Type == llvm::ELF::SHT_STRTAB;
114 template <class ELFT> class Object {
116 typedef std::unique_ptr<SectionBase> SecPtr;
117 typedef std::unique_ptr<Segment> SegPtr;
119 typedef typename ELFT::Shdr Elf_Shdr;
120 typedef typename ELFT::Ehdr Elf_Ehdr;
121 typedef typename ELFT::Phdr Elf_Phdr;
123 SecPtr makeSection(const llvm::object::ELFFile<ELFT> &ElfFile,
124 const Elf_Shdr &Shdr);
125 void readProgramHeaders(const llvm::object::ELFFile<ELFT> &ElfFile);
126 void readSectionHeaders(const llvm::object::ELFFile<ELFT> &ElfFile);
129 StringTableSection *SectionNames;
130 std::vector<SecPtr> Sections;
131 std::vector<SegPtr> Segments;
133 void writeHeader(llvm::FileOutputBuffer &Out) const;
134 void writeProgramHeaders(llvm::FileOutputBuffer &Out) const;
135 void writeSectionData(llvm::FileOutputBuffer &Out) const;
136 void writeSectionHeaders(llvm::FileOutputBuffer &Out) const;
147 Object(const llvm::object::ELFObjectFile<ELFT> &Obj);
148 virtual size_t totalSize() const = 0;
149 virtual void finalize() = 0;
150 virtual void write(llvm::FileOutputBuffer &Out) const = 0;
151 virtual ~Object() = default;
154 template <class ELFT> class ELFObject : public Object<ELFT> {
156 typedef std::unique_ptr<SectionBase> SecPtr;
157 typedef std::unique_ptr<Segment> SegPtr;
159 typedef typename ELFT::Shdr Elf_Shdr;
160 typedef typename ELFT::Ehdr Elf_Ehdr;
161 typedef typename ELFT::Phdr Elf_Phdr;
164 void assignOffsets();
167 ELFObject(const llvm::object::ELFObjectFile<ELFT> &Obj) : Object<ELFT>(Obj) {}
168 void finalize() override;
169 size_t totalSize() const override;
170 void write(llvm::FileOutputBuffer &Out) const override;
173 template <class ELFT> class BinaryObject : public Object<ELFT> {
175 typedef std::unique_ptr<SectionBase> SecPtr;
176 typedef std::unique_ptr<Segment> SegPtr;
181 BinaryObject(const llvm::object::ELFObjectFile<ELFT> &Obj)
182 : Object<ELFT>(Obj) {}
183 void finalize() override;
184 size_t totalSize() const override;
185 void write(llvm::FileOutputBuffer &Out) const override;