1 files changed, 74 insertions, 0 deletions
diff --git a/lld/MachO/OutputSection.h b/lld/MachO/OutputSection.h
new file mode 100644
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+++ b/lld/MachO/OutputSection.h
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+//===- OutputSection.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_OUTPUT_SECTION_H
+#define LLD_MACHO_OUTPUT_SECTION_H
+
+#include "lld/Common/LLVM.h"
+#include "llvm/ADT/DenseMap.h"
+
+namespace lld {
+namespace macho {
+
+class InputSection;
+class OutputSegment;
+
+// Output sections represent the finalized sections present within the final
+// linked executable. They can represent special sections (like the symbol
+// table), or represent coalesced sections from the various inputs given to the
+// linker with the same segment / section name.
+class OutputSection {
+public:
+  enum Kind {
+    MergedKind,
+    SyntheticKind,
+  };
+
+  OutputSection(Kind kind, StringRef name) : name(name), sectionKind(kind) {}
+  virtual ~OutputSection() = default;
+  Kind kind() const { return sectionKind; }
+
+  // These accessors will only be valid after finalizing the section.
+  uint64_t getSegmentOffset() const;
+
+  // How much space the section occupies in the address space.
+  virtual uint64_t getSize() const = 0;
+  // How much space the section occupies in the file. Most sections are copied
+  // as-is so their file size is the same as their address space size.
+  virtual uint64_t getFileSize() const { return getSize(); }
+
+  // Hidden sections omit header content, but body content may still be present.
+  virtual bool isHidden() const { return false; }
+  // Unneeded sections are omitted entirely (header and body).
+  virtual bool isNeeded() const { return true; }
+
+  // Specifically finalizes addresses and section size, not content.
+  virtual void finalize() {
+    // TODO investigate refactoring synthetic section finalization logic into
+    // overrides of this function.
+  }
+
+  virtual void writeTo(uint8_t *buf) const = 0;
+
+  StringRef name;
+  OutputSegment *parent = nullptr;
+
+  uint32_t index = 0;
+  uint64_t addr = 0;
+  uint64_t fileOff = 0;
+  uint32_t align = 1;
+  uint32_t flags = 0;
+
+private:
+  Kind sectionKind;
+};
+
+} // namespace macho
+} // namespace lld
+
+#endif