Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- StringsAndChecksums.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 LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H

#define LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H

#include "llvm/DebugInfo/CodeView/CodeView.h"

#include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"

#include <memory>

namespace llvm {

namespace codeview {

class DebugChecksumsSubsection;

class DebugChecksumsSubsectionRef;

class DebugStringTableSubsection;

class DebugStringTableSubsectionRef;

class StringsAndChecksumsRef {

public:

  // If no subsections are known about initially, we find as much as we can.

  StringsAndChecksumsRef();

  // If only a string table subsection is given, we find a checksums subsection.

  explicit StringsAndChecksumsRef(const DebugStringTableSubsectionRef &Strings);

  // If both subsections are given, we don't need to find anything.

  StringsAndChecksumsRef(const DebugStringTableSubsectionRef &Strings,

                         const DebugChecksumsSubsectionRef &Checksums);

  void setStrings(const DebugStringTableSubsectionRef &Strings);

  void setChecksums(const DebugChecksumsSubsectionRef &CS);

  void reset();

  void resetStrings();

  void resetChecksums();

  template <typename T> void initialize(T &&FragmentRange) {

    for (const DebugSubsectionRecord &R : FragmentRange) {

      if (Strings && Checksums)

        return;

      if (R.kind() == DebugSubsectionKind::FileChecksums) {

        initializeChecksums(R);

        continue;

      }

      if (R.kind() == DebugSubsectionKind::StringTable && !Strings) {

        // While in practice we should never encounter a string table even

        // though the string table is already initialized, in theory it's

        // possible.  PDBs are supposed to have one global string table and

        // then this subsection should not appear.  Whereas object files are

        // supposed to have this subsection appear exactly once.  However,

        // for testing purposes it's nice to be able to test this subsection

        // independently of one format or the other, so for some tests we

        // manually construct a PDB that contains this subsection in addition

        // to a global string table.

        initializeStrings(R);

        continue;

      }

    }

  }

  const DebugStringTableSubsectionRef &strings() const { return *Strings; }

  const DebugChecksumsSubsectionRef &checksums() const { return *Checksums; }

  bool hasStrings() const { return Strings != nullptr; }

  bool hasChecksums() const { return Checksums != nullptr; }

private:

  void initializeStrings(const DebugSubsectionRecord &SR);

  void initializeChecksums(const DebugSubsectionRecord &FCR);

  std::shared_ptr<DebugStringTableSubsectionRef> OwnedStrings;

  std::shared_ptr<DebugChecksumsSubsectionRef> OwnedChecksums;

  const DebugStringTableSubsectionRef *Strings = nullptr;

  const DebugChecksumsSubsectionRef *Checksums = nullptr;

};

class StringsAndChecksums {

public:

  using StringsPtr = std::shared_ptr<DebugStringTableSubsection>;

  using ChecksumsPtr = std::shared_ptr<DebugChecksumsSubsection>;

  // If no subsections are known about initially, we find as much as we can.

  StringsAndChecksums() = default;

  void setStrings(const StringsPtr &SP) { Strings = SP; }

  void setChecksums(const ChecksumsPtr &CP) { Checksums = CP; }

  const StringsPtr &strings() const { return Strings; }

  const ChecksumsPtr &checksums() const { return Checksums; }

  bool hasStrings() const { return Strings != nullptr; }

  bool hasChecksums() const { return Checksums != nullptr; }

private:

  StringsPtr Strings;

  ChecksumsPtr Checksums;

};

} // end namespace codeview

} // end namespace llvm

#endif // LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H