83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
//===- lib/ReaderWriter/ELF/ELFReader.h -----------------------------------===//
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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_READER_WRITER_ELF_READER_H
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#define LLD_READER_WRITER_ELF_READER_H
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#include "DynamicFile.h"
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#include "ELFFile.h"
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#include "lld/Core/File.h"
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#include "lld/Core/Reader.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Object/ELF.h"
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namespace lld {
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namespace elf {
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template <typename ELFT, typename ContextT, template <typename> class FileT>
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class ELFReader : public Reader {
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public:
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typedef llvm::object::Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
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ELFReader(ContextT &ctx) : _ctx(ctx) {}
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bool canParse(file_magic magic, const MemoryBuffer &mb) const override {
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return (FileT<ELFT>::canParse(magic) &&
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elfHeader(mb)->e_machine == ContextT::machine);
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}
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std::error_code
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loadFile(std::unique_ptr<MemoryBuffer> mb, const class Registry &,
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std::vector<std::unique_ptr<File>> &result) const override {
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const Elf_Ehdr *hdr = elfHeader(*mb);
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if (auto ec = _ctx.mergeHeaderFlags(hdr->getFileClass(), hdr->e_flags))
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return ec;
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result.push_back(createELF(std::move(mb)));
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return std::error_code();
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}
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private:
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/// Create an object depending on the runtime attributes and alignment
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/// of an ELF file.
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std::unique_ptr<File> createELF(std::unique_ptr<MemoryBuffer> mb) const {
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using namespace llvm::ELF;
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using namespace llvm::support;
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if (uintptr_t(mb->getBufferStart()) & 1)
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llvm_unreachable("Invalid alignment for ELF file!");
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unsigned char size;
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unsigned char endian;
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std::tie(size, endian) = llvm::object::getElfArchType(mb->getBuffer());
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File *file = nullptr;
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if (size == ELFCLASS32 && endian == ELFDATA2LSB) {
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file = new FileT<ELF32LE>(std::move(mb), _ctx);
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} else if (size == ELFCLASS32 && endian == ELFDATA2MSB) {
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file = new FileT<ELF32BE>(std::move(mb), _ctx);
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} else if (size == ELFCLASS64 && endian == ELFDATA2LSB) {
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file = new FileT<ELF64LE>(std::move(mb), _ctx);
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} else if (size == ELFCLASS64 && endian == ELFDATA2MSB) {
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file = new FileT<ELF64BE>(std::move(mb), _ctx);
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}
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if (!file)
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llvm_unreachable("Invalid ELF type!");
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return std::unique_ptr<File>(file);
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}
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static const Elf_Ehdr *elfHeader(const MemoryBuffer &buf) {
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return reinterpret_cast<const Elf_Ehdr *>(buf.getBuffer().data());
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}
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ContextT &_ctx;
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};
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} // namespace elf
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} // namespace lld
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#endif // LLD_READER_WRITER_ELF_READER_H
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