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  1. //===- StringsAndChecksums.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_STRINGSANDCHECKSUMS_H
  10. #define LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H
  11.  
  12. #include "llvm/DebugInfo/CodeView/CodeView.h"
  13. #include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
  14. #include <memory>
  15.  
  16. namespace llvm {
  17. namespace codeview {
  18. class DebugChecksumsSubsection;
  19. class DebugChecksumsSubsectionRef;
  20. class DebugStringTableSubsection;
  21. class DebugStringTableSubsectionRef;
  22.  
  23. class StringsAndChecksumsRef {
  24. public:
  25.   // If no subsections are known about initially, we find as much as we can.
  26.   StringsAndChecksumsRef();
  27.  
  28.   // If only a string table subsection is given, we find a checksums subsection.
  29.   explicit StringsAndChecksumsRef(const DebugStringTableSubsectionRef &Strings);
  30.  
  31.   // If both subsections are given, we don't need to find anything.
  32.   StringsAndChecksumsRef(const DebugStringTableSubsectionRef &Strings,
  33.                          const DebugChecksumsSubsectionRef &Checksums);
  34.  
  35.   void setStrings(const DebugStringTableSubsectionRef &Strings);
  36.   void setChecksums(const DebugChecksumsSubsectionRef &CS);
  37.  
  38.   void reset();
  39.   void resetStrings();
  40.   void resetChecksums();
  41.  
  42.   template <typename T> void initialize(T &&FragmentRange) {
  43.     for (const DebugSubsectionRecord &R : FragmentRange) {
  44.       if (Strings && Checksums)
  45.         return;
  46.       if (R.kind() == DebugSubsectionKind::FileChecksums) {
  47.         initializeChecksums(R);
  48.         continue;
  49.       }
  50.       if (R.kind() == DebugSubsectionKind::StringTable && !Strings) {
  51.         // While in practice we should never encounter a string table even
  52.         // though the string table is already initialized, in theory it's
  53.         // possible.  PDBs are supposed to have one global string table and
  54.         // then this subsection should not appear.  Whereas object files are
  55.         // supposed to have this subsection appear exactly once.  However,
  56.         // for testing purposes it's nice to be able to test this subsection
  57.         // independently of one format or the other, so for some tests we
  58.         // manually construct a PDB that contains this subsection in addition
  59.         // to a global string table.
  60.         initializeStrings(R);
  61.         continue;
  62.       }
  63.     }
  64.   }
  65.  
  66.   const DebugStringTableSubsectionRef &strings() const { return *Strings; }
  67.   const DebugChecksumsSubsectionRef &checksums() const { return *Checksums; }
  68.  
  69.   bool hasStrings() const { return Strings != nullptr; }
  70.   bool hasChecksums() const { return Checksums != nullptr; }
  71.  
  72. private:
  73.   void initializeStrings(const DebugSubsectionRecord &SR);
  74.   void initializeChecksums(const DebugSubsectionRecord &FCR);
  75.  
  76.   std::shared_ptr<DebugStringTableSubsectionRef> OwnedStrings;
  77.   std::shared_ptr<DebugChecksumsSubsectionRef> OwnedChecksums;
  78.  
  79.   const DebugStringTableSubsectionRef *Strings = nullptr;
  80.   const DebugChecksumsSubsectionRef *Checksums = nullptr;
  81. };
  82.  
  83. class StringsAndChecksums {
  84. public:
  85.   using StringsPtr = std::shared_ptr<DebugStringTableSubsection>;
  86.   using ChecksumsPtr = std::shared_ptr<DebugChecksumsSubsection>;
  87.  
  88.   // If no subsections are known about initially, we find as much as we can.
  89.   StringsAndChecksums() = default;
  90.  
  91.   void setStrings(const StringsPtr &SP) { Strings = SP; }
  92.   void setChecksums(const ChecksumsPtr &CP) { Checksums = CP; }
  93.  
  94.   const StringsPtr &strings() const { return Strings; }
  95.   const ChecksumsPtr &checksums() const { return Checksums; }
  96.  
  97.   bool hasStrings() const { return Strings != nullptr; }
  98.   bool hasChecksums() const { return Checksums != nullptr; }
  99.  
  100. private:
  101.   StringsPtr Strings;
  102.   ChecksumsPtr Checksums;
  103. };
  104.  
  105. } // end namespace codeview
  106. } // end namespace llvm
  107.  
  108. #endif // LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H
  109.