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  1. //===- TpiHashing.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_PDB_NATIVE_TPIHASHING_H
  10. #define LLVM_DEBUGINFO_PDB_NATIVE_TPIHASHING_H
  11.  
  12. #include "llvm/DebugInfo/CodeView/TypeRecord.h"
  13. #include "llvm/Support/Error.h"
  14.  
  15. namespace llvm {
  16. namespace pdb {
  17.  
  18. Expected<uint32_t> hashTypeRecord(const llvm::codeview::CVType &Type);
  19.  
  20. struct TagRecordHash {
  21.   explicit TagRecordHash(codeview::ClassRecord CR, uint32_t Full,
  22.                          uint32_t Forward)
  23.       : FullRecordHash(Full), ForwardDeclHash(Forward), Class(std::move(CR)) {
  24.     State = 0;
  25.   }
  26.  
  27.   explicit TagRecordHash(codeview::EnumRecord ER, uint32_t Full,
  28.                          uint32_t Forward)
  29.       : FullRecordHash(Full), ForwardDeclHash(Forward), Enum(std::move(ER)) {
  30.     State = 1;
  31.   }
  32.  
  33.   explicit TagRecordHash(codeview::UnionRecord UR, uint32_t Full,
  34.                          uint32_t Forward)
  35.       : FullRecordHash(Full), ForwardDeclHash(Forward), Union(std::move(UR)) {
  36.     State = 2;
  37.   }
  38.  
  39.   uint32_t FullRecordHash;
  40.   uint32_t ForwardDeclHash;
  41.  
  42.   codeview::TagRecord &getRecord() {
  43.     switch (State) {
  44.     case 0:
  45.       return Class;
  46.     case 1:
  47.       return Enum;
  48.     case 2:
  49.       return Union;
  50.     }
  51.     llvm_unreachable("unreachable!");
  52.   }
  53.  
  54. private:
  55.   union {
  56.     codeview::ClassRecord Class;
  57.     codeview::EnumRecord Enum;
  58.     codeview::UnionRecord Union;
  59.   };
  60.  
  61.   uint8_t State = 0;
  62. };
  63.  
  64. /// Given a CVType referring to a class, structure, union, or enum, compute
  65. /// the hash of its forward decl and full decl.
  66. Expected<TagRecordHash> hashTagRecord(const codeview::CVType &Type);
  67.  
  68. } // end namespace pdb
  69. } // end namespace llvm
  70.  
  71. #endif // LLVM_DEBUGINFO_PDB_NATIVE_TPIHASHING_H
  72.