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  1. //===- DebugChecksumsSubsection.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_CODEVIEW_DEBUGCHECKSUMSSUBSECTION_H
  10. #define LLVM_DEBUGINFO_CODEVIEW_DEBUGCHECKSUMSSUBSECTION_H
  11.  
  12. #include "llvm/ADT/ArrayRef.h"
  13. #include "llvm/ADT/DenseMap.h"
  14. #include "llvm/ADT/StringRef.h"
  15. #include "llvm/DebugInfo/CodeView/CodeView.h"
  16. #include "llvm/DebugInfo/CodeView/DebugSubsection.h"
  17. #include "llvm/Support/Allocator.h"
  18. #include "llvm/Support/BinaryStreamArray.h"
  19. #include "llvm/Support/BinaryStreamRef.h"
  20. #include "llvm/Support/Error.h"
  21. #include <cstdint>
  22. #include <vector>
  23.  
  24. namespace llvm {
  25.  
  26. class BinaryStreamReader;
  27. class BinaryStreamWriter;
  28.  
  29. namespace codeview {
  30.  
  31. class DebugStringTableSubsection;
  32.  
  33. struct FileChecksumEntry {
  34.   uint32_t FileNameOffset;    // Byte offset of filename in global stringtable.
  35.   FileChecksumKind Kind;      // The type of checksum.
  36.   ArrayRef<uint8_t> Checksum; // The bytes of the checksum.
  37. };
  38.  
  39. } // end namespace codeview
  40.  
  41. template <> struct VarStreamArrayExtractor<codeview::FileChecksumEntry> {
  42. public:
  43.   using ContextType = void;
  44.  
  45.   Error operator()(BinaryStreamRef Stream, uint32_t &Len,
  46.                    codeview::FileChecksumEntry &Item);
  47. };
  48.  
  49. namespace codeview {
  50.  
  51. class DebugChecksumsSubsectionRef final : public DebugSubsectionRef {
  52.   using FileChecksumArray = VarStreamArray<codeview::FileChecksumEntry>;
  53.   using Iterator = FileChecksumArray::Iterator;
  54.  
  55. public:
  56.   DebugChecksumsSubsectionRef()
  57.       : DebugSubsectionRef(DebugSubsectionKind::FileChecksums) {}
  58.  
  59.   static bool classof(const DebugSubsectionRef *S) {
  60.     return S->kind() == DebugSubsectionKind::FileChecksums;
  61.   }
  62.  
  63.   bool valid() const { return Checksums.valid(); }
  64.  
  65.   Error initialize(BinaryStreamReader Reader);
  66.   Error initialize(BinaryStreamRef Stream);
  67.  
  68.   Iterator begin() const { return Checksums.begin(); }
  69.   Iterator end() const { return Checksums.end(); }
  70.  
  71.   const FileChecksumArray &getArray() const { return Checksums; }
  72.  
  73. private:
  74.   FileChecksumArray Checksums;
  75. };
  76.  
  77. class DebugChecksumsSubsection final : public DebugSubsection {
  78. public:
  79.   explicit DebugChecksumsSubsection(DebugStringTableSubsection &Strings);
  80.  
  81.   static bool classof(const DebugSubsection *S) {
  82.     return S->kind() == DebugSubsectionKind::FileChecksums;
  83.   }
  84.  
  85.   void addChecksum(StringRef FileName, FileChecksumKind Kind,
  86.                    ArrayRef<uint8_t> Bytes);
  87.  
  88.   uint32_t calculateSerializedSize() const override;
  89.   Error commit(BinaryStreamWriter &Writer) const override;
  90.   uint32_t mapChecksumOffset(StringRef FileName) const;
  91.  
  92. private:
  93.   DebugStringTableSubsection &Strings;
  94.  
  95.   DenseMap<uint32_t, uint32_t> OffsetMap;
  96.   uint32_t SerializedSize = 0;
  97.   BumpPtrAllocator Storage;
  98.   std::vector<FileChecksumEntry> Checksums;
  99. };
  100.  
  101. } // end namespace codeview
  102.  
  103. } // end namespace llvm
  104.  
  105. #endif // LLVM_DEBUGINFO_CODEVIEW_DEBUGCHECKSUMSSUBSECTION_H
  106.