DWARFDebugArangeSet.h revision 360784 
1//===- DWARFDebugArangeSet.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_DWARFDEBUGARANGESET_H
10#define LLVM_DEBUGINFO_DWARFDEBUGARANGESET_H
11
12#include "llvm/ADT/iterator_range.h"
13#include "llvm/Support/DataExtractor.h"
14#include <cstdint>
15#include <vector>
16
17namespace llvm {
18
19class raw_ostream;
20
21class DWARFDebugArangeSet {
22public:
23  struct Header {
24    /// The total length of the entries for that set, not including the length
25    /// field itself.
26    uint32_t Length;
27    /// The offset from the beginning of the .debug_info section of the
28    /// compilation unit entry referenced by the table.
29    uint32_t CuOffset;
30    /// The DWARF version number.
31    uint16_t Version;
32    /// The size in bytes of an address on the target architecture. For segmented
33    /// addressing, this is the size of the offset portion of the address.
34    uint8_t AddrSize;
35    /// The size in bytes of a segment descriptor on the target architecture.
36    /// If the target system uses a flat address space, this value is 0.
37    uint8_t SegSize;
38  };
39
40  struct Descriptor {
41    uint64_t Address;
42    uint64_t Length;
43
44    uint64_t getEndAddress() const { return Address + Length; }
45    void dump(raw_ostream &OS, uint32_t AddressSize) const;
46  };
47
48private:
49  using DescriptorColl = std::vector<Descriptor>;
50  using desc_iterator_range = iterator_range<DescriptorColl::const_iterator>;
51
52  uint64_t Offset;
53  Header HeaderData;
54  DescriptorColl ArangeDescriptors;
55
56public:
57  DWARFDebugArangeSet() { clear(); }
58
59  void clear();
60  bool extract(DataExtractor data, uint64_t *offset_ptr);
61  void dump(raw_ostream &OS) const;
62
63  uint32_t getCompileUnitDIEOffset() const { return HeaderData.CuOffset; }
64
65  const Header &getHeader() const { return HeaderData; }
66
67  desc_iterator_range descriptors() const {
68    return desc_iterator_range(ArangeDescriptors.begin(),
69                               ArangeDescriptors.end());
70  }
71};
72
73} // end namespace llvm
74
75#endif // LLVM_DEBUGINFO_DWARFDEBUGARANGESET_H
76