DWARFDebugAranges.h revision cd81d94322a39503e4a3e87b6ee03d4fcb3465fb 
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_DEBUGINFO_DWARFDEBUGARANGES_H
11#define LLVM_DEBUGINFO_DWARFDEBUGARANGES_H
12
13#include "llvm/ADT/DenseSet.h"
14#include "llvm/Support/DataExtractor.h"
15#include <vector>
16
17namespace llvm {
18
19class DWARFContext;
20
21class DWARFDebugAranges {
22public:
23  void generate(DWARFContext *CTX);
24  uint32_t findAddress(uint64_t Address) const;
25
26private:
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