1 files changed, 74 insertions, 0 deletions
diff --git a/lld/MachO/InputSection.h b/lld/MachO/InputSection.h
new file mode 100644
index 000000000000..96ae0cbe6ea4
--- /dev/null
+++ b/lld/MachO/InputSection.h
@@ -0,0 +1,74 @@
+//===- InputSection.h -------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLD_MACHO_INPUT_SECTION_H
+#define LLD_MACHO_INPUT_SECTION_H
+
+#include "lld/Common/LLVM.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/PointerUnion.h"
+#include "llvm/BinaryFormat/MachO.h"
+
+namespace lld {
+namespace macho {
+
+class InputFile;
+class InputSection;
+class OutputSection;
+class Symbol;
+
+struct Reloc {
+  uint8_t type;
+  bool pcrel;
+  uint8_t length;
+  // The offset from the start of the subsection that this relocation belongs
+  // to.
+  uint32_t offset;
+  // Adding this offset to the address of the target symbol or subsection gives
+  // the destination that this relocation refers to.
+  uint64_t addend;
+  llvm::PointerUnion<Symbol *, InputSection *> target;
+};
+
+inline bool isZeroFill(uint8_t flags) {
+  return (flags & llvm::MachO::SECTION_TYPE) == llvm::MachO::S_ZEROFILL;
+}
+
+class InputSection {
+public:
+  virtual ~InputSection() = default;
+  virtual uint64_t getSize() const { return data.size(); }
+  virtual uint64_t getFileSize() const {
+    return isZeroFill(flags) ? 0 : getSize();
+  }
+  uint64_t getFileOffset() const;
+  uint64_t getVA() const;
+
+  virtual void writeTo(uint8_t *buf);
+
+  InputFile *file = nullptr;
+  StringRef name;
+  StringRef segname;
+
+  OutputSection *parent = nullptr;
+  uint64_t outSecOff = 0;
+  uint64_t outSecFileOff = 0;
+
+  uint32_t align = 1;
+  uint32_t flags = 0;
+
+  ArrayRef<uint8_t> data;
+  std::vector<Reloc> relocs;
+};
+
+extern std::vector<InputSection *> inputSections;
+
+} // namespace macho
+} // namespace lld
+
+#endif