87 lines
2.7 KiB
C++
87 lines
2.7 KiB
C++
//===- InputSection.h -------------------------------------------*- C++ -*-===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLD_ELF_INPUT_SECTION_H
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#define LLD_ELF_INPUT_SECTION_H
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#include "lld/Core/LLVM.h"
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#include "llvm/Object/ELF.h"
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namespace lld {
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namespace elf2 {
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template <class ELFT> class ObjectFile;
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template <class ELFT> class OutputSection;
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// This corresponds to a section of an input file.
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template <class ELFT> class InputSection {
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typedef typename llvm::object::ELFFile<ELFT>::Elf_Shdr Elf_Shdr;
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typedef typename llvm::object::ELFFile<ELFT>::Elf_Rela Elf_Rela;
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typedef typename llvm::object::ELFFile<ELFT>::Elf_Rel Elf_Rel;
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typedef typename llvm::object::ELFFile<ELFT>::Elf_Sym Elf_Sym;
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typedef typename llvm::object::ELFFile<ELFT>::uintX_t uintX_t;
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public:
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InputSection(ObjectFile<ELFT> *F, const Elf_Shdr *Header);
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// Returns the size of this section (even if this is a common or BSS.)
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size_t getSize() const { return Header->sh_size; }
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// Write this section to a mmap'ed file, assuming Buf is pointing to
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// beginning of the output section.
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void writeTo(uint8_t *Buf);
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StringRef getSectionName() const;
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const Elf_Shdr *getSectionHdr() const { return Header; }
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ObjectFile<ELFT> *getFile() const { return File; }
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// The writer sets and uses the addresses.
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uintX_t getOutputSectionOff() const { return OutputSectionOff; }
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uintX_t getAlign() {
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// The ELF spec states that a value of 0 means the section has no alignment
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// constraits.
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return std::max<uintX_t>(Header->sh_addralign, 1);
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}
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void setOutputSectionOff(uint64_t V) { OutputSectionOff = V; }
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void setOutputSection(OutputSection<ELFT> *O) { OutSec = O; }
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OutputSection<ELFT> *getOutputSection() const { return OutSec; }
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// Relocation sections that refer to this one.
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SmallVector<const Elf_Shdr *, 1> RelocSections;
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static InputSection<ELFT> Discarded;
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private:
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template <bool isRela>
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void relocate(uint8_t *Buf, uint8_t *BufEnd,
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llvm::iterator_range<
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const llvm::object::Elf_Rel_Impl<ELFT, isRela> *> Rels,
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const ObjectFile<ELFT> &File, uintX_t BaseAddr);
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// The offset from beginning of the output sections this section was assigned
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// to. The writer sets a value.
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uint64_t OutputSectionOff = 0;
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// The file this section is from.
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ObjectFile<ELFT> *File;
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OutputSection<ELFT> *OutSec = nullptr;
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const Elf_Shdr *Header;
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};
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template <class ELFT>
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InputSection<ELFT> InputSection<ELFT>::Discarded(nullptr, nullptr);
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} // namespace elf2
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} // namespace lld
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#endif
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