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  1. //===- DWARFObject.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 LLVM_DEBUGINFO_DWARF_DWARFOBJECT_H
  10. #define LLVM_DEBUGINFO_DWARF_DWARFOBJECT_H
  11.  
  12. #include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
  13. #include "llvm/DebugInfo/DWARF/DWARFSection.h"
  14. #include "llvm/Object/ObjectFile.h"
  15. #include <optional>
  16.  
  17. namespace llvm {
  18. // This is responsible for low level access to the object file. It
  19. // knows how to find the required sections and compute relocated
  20. // values.
  21. // The default implementations of the get<Section> methods return dummy values.
  22. // This is to allow clients that only need some of those to implement just the
  23. // ones they need. We can't use unreachable for as many cases because the parser
  24. // implementation is eager and will call some of these methods even if the
  25. // result is not used.
  26. class DWARFObject {
  27.   DWARFSection Dummy;
  28.  
  29. public:
  30.   virtual ~DWARFObject() = default;
  31.   virtual StringRef getFileName() const { llvm_unreachable("unimplemented"); }
  32.   virtual const object::ObjectFile *getFile() const { return nullptr; }
  33.   virtual ArrayRef<SectionName> getSectionNames() const { return {}; }
  34.   virtual bool isLittleEndian() const = 0;
  35.   virtual uint8_t getAddressSize() const { llvm_unreachable("unimplemented"); }
  36.   virtual void
  37.   forEachInfoSections(function_ref<void(const DWARFSection &)> F) const {}
  38.   virtual void
  39.   forEachTypesSections(function_ref<void(const DWARFSection &)> F) const {}
  40.   virtual StringRef getAbbrevSection() const { return ""; }
  41.   virtual const DWARFSection &getLocSection() const { return Dummy; }
  42.   virtual const DWARFSection &getLoclistsSection() const { return Dummy; }
  43.   virtual StringRef getArangesSection() const { return ""; }
  44.   virtual const DWARFSection &getFrameSection() const { return Dummy; }
  45.   virtual const DWARFSection &getEHFrameSection() const { return Dummy; }
  46.   virtual const DWARFSection &getLineSection() const { return Dummy; }
  47.   virtual StringRef getLineStrSection() const { return ""; }
  48.   virtual StringRef getStrSection() const { return ""; }
  49.   virtual const DWARFSection &getRangesSection() const { return Dummy; }
  50.   virtual const DWARFSection &getRnglistsSection() const { return Dummy; }
  51.   virtual const DWARFSection &getMacroSection() const { return Dummy; }
  52.   virtual StringRef getMacroDWOSection() const { return ""; }
  53.   virtual StringRef getMacinfoSection() const { return ""; }
  54.   virtual StringRef getMacinfoDWOSection() const { return ""; }
  55.   virtual const DWARFSection &getPubnamesSection() const { return Dummy; }
  56.   virtual const DWARFSection &getPubtypesSection() const { return Dummy; }
  57.   virtual const DWARFSection &getGnuPubnamesSection() const { return Dummy; }
  58.   virtual const DWARFSection &getGnuPubtypesSection() const { return Dummy; }
  59.   virtual const DWARFSection &getStrOffsetsSection() const { return Dummy; }
  60.   virtual void
  61.   forEachInfoDWOSections(function_ref<void(const DWARFSection &)> F) const {}
  62.   virtual void
  63.   forEachTypesDWOSections(function_ref<void(const DWARFSection &)> F) const {}
  64.   virtual StringRef getAbbrevDWOSection() const { return ""; }
  65.   virtual const DWARFSection &getLineDWOSection() const { return Dummy; }
  66.   virtual const DWARFSection &getLocDWOSection() const { return Dummy; }
  67.   virtual const DWARFSection &getLoclistsDWOSection() const { return Dummy; }
  68.   virtual StringRef getStrDWOSection() const { return ""; }
  69.   virtual const DWARFSection &getStrOffsetsDWOSection() const {
  70.     return Dummy;
  71.   }
  72.   virtual const DWARFSection &getRangesDWOSection() const { return Dummy; }
  73.   virtual const DWARFSection &getRnglistsDWOSection() const { return Dummy; }
  74.   virtual const DWARFSection &getAddrSection() const { return Dummy; }
  75.   virtual const DWARFSection &getAppleNamesSection() const { return Dummy; }
  76.   virtual const DWARFSection &getAppleTypesSection() const { return Dummy; }
  77.   virtual const DWARFSection &getAppleNamespacesSection() const {
  78.     return Dummy;
  79.   }
  80.   virtual const DWARFSection &getNamesSection() const { return Dummy; }
  81.   virtual const DWARFSection &getAppleObjCSection() const { return Dummy; }
  82.   virtual StringRef getCUIndexSection() const { return ""; }
  83.   virtual StringRef getGdbIndexSection() const { return ""; }
  84.   virtual StringRef getTUIndexSection() const { return ""; }
  85.   virtual std::optional<RelocAddrEntry> find(const DWARFSection &Sec,
  86.                                              uint64_t Pos) const = 0;
  87. };
  88.  
  89. } // namespace llvm
  90. #endif
  91.