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      1 //===- DWARFDebugAbbrev.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_DWARF_DWARFDEBUGABBREV_H
     10 #define LLVM_DEBUGINFO_DWARF_DWARFDEBUGABBREV_H
     11 
     12 #include "llvm/DebugInfo/DWARF/DWARFAbbreviationDeclaration.h"
     13 #include "llvm/Support/DataExtractor.h"
     14 #include <cstdint>
     15 #include <map>
     16 #include <vector>
     17 
     18 namespace llvm {
     19 
     20 class raw_ostream;
     21 
     22 class DWARFAbbreviationDeclarationSet {
     23   uint64_t Offset;
     24   /// Code of the first abbreviation, if all abbreviations in the set have
     25   /// consecutive codes. UINT32_MAX otherwise.
     26   uint32_t FirstAbbrCode;
     27   std::vector<DWARFAbbreviationDeclaration> Decls;
     28 
     29   using const_iterator =
     30       std::vector<DWARFAbbreviationDeclaration>::const_iterator;
     31 
     32 public:
     33   DWARFAbbreviationDeclarationSet();
     34 
     35   uint64_t getOffset() const { return Offset; }
     36   void dump(raw_ostream &OS) const;
     37   bool extract(DataExtractor Data, uint64_t *OffsetPtr);
     38 
     39   const DWARFAbbreviationDeclaration *
     40   getAbbreviationDeclaration(uint32_t AbbrCode) const;
     41 
     42   const_iterator begin() const {
     43     return Decls.begin();
     44   }
     45 
     46   const_iterator end() const {
     47     return Decls.end();
     48   }
     49 
     50 private:
     51   void clear();
     52 };
     53 
     54 class DWARFDebugAbbrev {
     55   using DWARFAbbreviationDeclarationSetMap =
     56       std::map<uint64_t, DWARFAbbreviationDeclarationSet>;
     57 
     58   mutable DWARFAbbreviationDeclarationSetMap AbbrDeclSets;
     59   mutable DWARFAbbreviationDeclarationSetMap::const_iterator PrevAbbrOffsetPos;
     60   mutable Optional<DataExtractor> Data;
     61 
     62 public:
     63   DWARFDebugAbbrev();
     64 
     65   const DWARFAbbreviationDeclarationSet *
     66   getAbbreviationDeclarationSet(uint64_t CUAbbrOffset) const;
     67 
     68   void dump(raw_ostream &OS) const;
     69   void parse() const;
     70   void extract(DataExtractor Data);
     71 
     72   DWARFAbbreviationDeclarationSetMap::const_iterator begin() const {
     73     parse();
     74     return AbbrDeclSets.begin();
     75   }
     76 
     77   DWARFAbbreviationDeclarationSetMap::const_iterator end() const {
     78     return AbbrDeclSets.end();
     79   }
     80 
     81 private:
     82   void clear();
     83 };
     84 
     85 } // end namespace llvm
     86 
     87 #endif // LLVM_DEBUGINFO_DWARF_DWARFDEBUGABBREV_H
     88