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;
74 const SectionBase *firstSection() const {
75 if (!Sections.empty())
76 return *Sections.begin();
79 void addSection(const SectionBase *sec) { Sections.insert(sec); }
80 template <class ELFT> void writeHeader(llvm::FileOutputBuffer &Out) const;
83 class Section : public SectionBase {
85 llvm::ArrayRef<uint8_t> Contents;
88 Section(llvm::ArrayRef<uint8_t> Data) : Contents(Data) {}
89 void writeSection(llvm::FileOutputBuffer &Out) const override;
92 // This is just a wraper around a StringTableBuilder that implements SectionBase
93 class StringTableSection : public SectionBase {
95 llvm::StringTableBuilder StrTabBuilder;
98 StringTableSection() : StrTabBuilder(llvm::StringTableBuilder::ELF) {
99 Type = llvm::ELF::SHT_STRTAB;
102 void addString(llvm::StringRef Name);
103 uint32_t findIndex(llvm::StringRef Name) const;
104 void finalize() override;
105 void writeSection(llvm::FileOutputBuffer &Out) const override;
106 static bool classof(const SectionBase *S) {
107 return S->Type == llvm::ELF::SHT_STRTAB;
111 template <class ELFT> class Object {
113 typedef std::unique_ptr<SectionBase> SecPtr;
114 typedef std::unique_ptr<Segment> SegPtr;
116 typedef typename ELFT::Shdr Elf_Shdr;
117 typedef typename ELFT::Ehdr Elf_Ehdr;
118 typedef typename ELFT::Phdr Elf_Phdr;
120 StringTableSection *SectionNames;
121 std::vector<SecPtr> Sections;
122 std::vector<SegPtr> Segments;
125 void assignOffsets();
126 SecPtr makeSection(const llvm::object::ELFFile<ELFT> &ElfFile,
127 const Elf_Shdr &Shdr);
128 void readProgramHeaders(const llvm::object::ELFFile<ELFT> &ElfFile);
129 void readSectionHeaders(const llvm::object::ELFFile<ELFT> &ElfFile);
130 void writeHeader(llvm::FileOutputBuffer &Out) const;
131 void writeProgramHeaders(llvm::FileOutputBuffer &Out) const;
132 void writeSectionData(llvm::FileOutputBuffer &Out) const;
133 void writeSectionHeaders(llvm::FileOutputBuffer &Out) const;
144 Object(const llvm::object::ELFObjectFile<ELFT> &Obj);
145 size_t totalSize() const;
147 void write(llvm::FileOutputBuffer &Out);