Home | History | Annotate | Download | only in DWARF 
      1 //===-- DWARFDebugAranges.h -------------------------------------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 #ifndef LLVM_LIB_DEBUGINFO_DWARFDEBUGARANGES_H
     11 #define LLVM_LIB_DEBUGINFO_DWARFDEBUGARANGES_H
     12 
     13 #include "llvm/ADT/DenseSet.h"
     14 #include "llvm/Support/DataExtractor.h"
     15 #include <vector>
     16 
     17 namespace llvm {
     18 
     19 class DWARFContext;
     20 
     21 class DWARFDebugAranges {
     22 public:
     23   void generate(DWARFContext *CTX);
     24   uint32_t findAddress(uint64_t Address) const;
     25 
     26 private:
     27   void clear();
     28   void extract(DataExtractor DebugArangesData);
     29 
     30   // Call appendRange multiple times and then call construct.
     31   void appendRange(uint32_t CUOffset, uint64_t LowPC, uint64_t HighPC);
     32   void construct();
     33 
     34   struct Range {
     35     explicit Range(uint64_t LowPC = -1ULL, uint64_t HighPC = -1ULL,
     36                    uint32_t CUOffset = -1U)
     37       : LowPC(LowPC), Length(HighPC - LowPC), CUOffset(CUOffset) {}
     38 
     39     void setHighPC(uint64_t HighPC) {
     40       if (HighPC == -1ULL || HighPC <= LowPC)
     41         Length = 0;
     42       else
     43         Length = HighPC - LowPC;
     44     }
     45     uint64_t HighPC() const {
     46       if (Length)
     47         return LowPC + Length;
     48       return -1ULL;
     49     }
     50 
     51     bool containsAddress(uint64_t Address) const {
     52       return LowPC <= Address && Address < HighPC();
     53     }
     54     bool operator<(const Range &other) const {
     55       return LowPC < other.LowPC;
     56     }
     57 
     58     uint64_t LowPC; // Start of address range.
     59     uint32_t Length; // End of address range (not including this address).
     60     uint32_t CUOffset; // Offset of the compile unit or die.
     61   };
     62 
     63   struct RangeEndpoint {
     64     uint64_t Address;
     65     uint32_t CUOffset;
     66     bool IsRangeStart;
     67 
     68     RangeEndpoint(uint64_t Address, uint32_t CUOffset, bool IsRangeStart)
     69         : Address(Address), CUOffset(CUOffset), IsRangeStart(IsRangeStart) {}
     70 
     71     bool operator<(const RangeEndpoint &Other) const {
     72       return Address < Other.Address;
     73     }
     74   };
     75 
     76 
     77   typedef std::vector<Range>              RangeColl;
     78   typedef RangeColl::const_iterator       RangeCollIterator;
     79 
     80   std::vector<RangeEndpoint> Endpoints;
     81   RangeColl Aranges;
     82   DenseSet<uint32_t> ParsedCUOffsets;
     83 };
     84 
     85 }
     86 
     87 #endif
     88