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1 //===- StringsAndChecksums.h ------------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H
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10 #define LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H
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11
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12 #include "llvm/DebugInfo/CodeView/CodeView.h"
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13 #include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
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14 #include "llvm/DebugInfo/CodeView/DebugStringTableSubsection.h"
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15 #include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
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16 #include <memory>
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17
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18 namespace llvm {
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19 namespace codeview {
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20
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21 class StringsAndChecksumsRef {
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22 public:
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23 // If no subsections are known about initially, we find as much as we can.
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24 StringsAndChecksumsRef();
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25
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26 // If only a string table subsection is given, we find a checksums subsection.
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27 explicit StringsAndChecksumsRef(const DebugStringTableSubsectionRef &Strings);
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28
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29 // If both subsections are given, we don't need to find anything.
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30 StringsAndChecksumsRef(const DebugStringTableSubsectionRef &Strings,
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31 const DebugChecksumsSubsectionRef &Checksums);
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32
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33 void setStrings(const DebugStringTableSubsectionRef &Strings);
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34 void setChecksums(const DebugChecksumsSubsectionRef &CS);
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35
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36 void reset();
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37 void resetStrings();
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38 void resetChecksums();
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39
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40 template <typename T> void initialize(T &&FragmentRange) {
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41 for (const DebugSubsectionRecord &R : FragmentRange) {
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42 if (Strings && Checksums)
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43 return;
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44 if (R.kind() == DebugSubsectionKind::FileChecksums) {
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45 initializeChecksums(R);
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46 continue;
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47 }
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48 if (R.kind() == DebugSubsectionKind::StringTable && !Strings) {
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49 // While in practice we should never encounter a string table even
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50 // though the string table is already initialized, in theory it's
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51 // possible. PDBs are supposed to have one global string table and
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52 // then this subsection should not appear. Whereas object files are
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53 // supposed to have this subsection appear exactly once. However,
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54 // for testing purposes it's nice to be able to test this subsection
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55 // independently of one format or the other, so for some tests we
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56 // manually construct a PDB that contains this subsection in addition
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57 // to a global string table.
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58 initializeStrings(R);
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59 continue;
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60 }
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61 }
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62 }
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63
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64 const DebugStringTableSubsectionRef &strings() const { return *Strings; }
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65 const DebugChecksumsSubsectionRef &checksums() const { return *Checksums; }
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66
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67 bool hasStrings() const { return Strings != nullptr; }
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68 bool hasChecksums() const { return Checksums != nullptr; }
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69
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70 private:
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71 void initializeStrings(const DebugSubsectionRecord &SR);
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72 void initializeChecksums(const DebugSubsectionRecord &FCR);
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73
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74 std::shared_ptr<DebugStringTableSubsectionRef> OwnedStrings;
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75 std::shared_ptr<DebugChecksumsSubsectionRef> OwnedChecksums;
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76
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77 const DebugStringTableSubsectionRef *Strings = nullptr;
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78 const DebugChecksumsSubsectionRef *Checksums = nullptr;
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79 };
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80
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81 class StringsAndChecksums {
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82 public:
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83 using StringsPtr = std::shared_ptr<DebugStringTableSubsection>;
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84 using ChecksumsPtr = std::shared_ptr<DebugChecksumsSubsection>;
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85
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86 // If no subsections are known about initially, we find as much as we can.
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87 StringsAndChecksums() = default;
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88
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89 void setStrings(const StringsPtr &SP) { Strings = SP; }
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90 void setChecksums(const ChecksumsPtr &CP) { Checksums = CP; }
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91
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92 const StringsPtr &strings() const { return Strings; }
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93 const ChecksumsPtr &checksums() const { return Checksums; }
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94
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95 bool hasStrings() const { return Strings != nullptr; }
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96 bool hasChecksums() const { return Checksums != nullptr; }
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97
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98 private:
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99 StringsPtr Strings;
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100 ChecksumsPtr Checksums;
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101 };
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102
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103 } // end namespace codeview
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104 } // end namespace llvm
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105
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106 #endif // LLVM_DEBUGINFO_CODEVIEW_STRINGSANDCHECKSUMS_H
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