lld/MachO/InputSection.h

   1 //===- InputSection.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_MACHO_INPUT_SECTION_H
  10 #define LLD_MACHO_INPUT_SECTION_H
  11
  12 #include "lld/Common/LLVM.h"
  13 #include "llvm/ADT/ArrayRef.h"
  14 #include "llvm/ADT/PointerUnion.h"
  15 #include "llvm/BinaryFormat/MachO.h"
  16
  17 namespace lld {
  18 namespace macho {
  19
  20 class InputFile;
  21 class InputSection;
  22 class OutputSection;
  23 class Symbol;
  24
  25 struct Reloc {
  26   uint8_t type;
  27   bool pcrel;
  28   uint8_t length;
  29   // The offset from the start of the subsection that this relocation belongs
  30   // to.
  31   uint32_t offset;
  32   // Adding this offset to the address of the target symbol or subsection gives
  33   // the destination that this relocation refers to.
  34   uint64_t addend;
  35   llvm::PointerUnion<Symbol *, InputSection *> target;
  36 };
  37
  38 inline bool isZeroFill(uint8_t flags) {
  39   return (flags & llvm::MachO::SECTION_TYPE) == llvm::MachO::S_ZEROFILL;
  40 }
  41
  42 class InputSection {
  43 public:
  44   virtual ~InputSection() = default;
  45   virtual uint64_t getSize() const { return data.size(); }
  46   virtual uint64_t getFileSize() const {
  47     return isZeroFill(flags) ? 0 : getSize();
  48   }
  49   uint64_t getFileOffset() const;
  50   uint64_t getVA() const;
  51
  52   virtual void writeTo(uint8_t *buf);
  53
  54   InputFile *file = nullptr;
  55   StringRef name;
  56   StringRef segname;
  57
  58   OutputSection *parent = nullptr;
  59   uint64_t outSecOff = 0;
  60   uint64_t outSecFileOff = 0;
  61
  62   uint32_t align = 1;
  63   uint32_t flags = 0;
  64
  65   ArrayRef<uint8_t> data;
  66   std::vector<Reloc> relocs;
  67 };
  68
  69 extern std::vector<InputSection *> inputSections;
  70
  71 } // namespace macho
  72 } // namespace lld
  73
  74 #endif