| //===- 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; |
| uint32_t reserved1 = 0; |
| uint32_t reserved2 = 0; |
| |
| private: |
| Kind sectionKind; |
| }; |
| |
| } // namespace macho |
| } // namespace lld |
| |
| #endif |