1 //===- DWARFDebugArangeSet.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_DWARFDEBUGARANGESET_H
11 #define LLVM_DEBUGINFO_DWARFDEBUGARANGESET_H
12 
13 #include "llvm/ADT/iterator_range.h"
14 #include "llvm/Support/DataExtractor.h"
15 #include <cstdint>
16 #include <vector>
17 
18 namespace llvm {
19 
20 class raw_ostream;
21 
22 class DWARFDebugArangeSet {
23 public:
24   struct Header {
25     /// The total length of the entries for that set, not including the length
26     /// field itself.
27     uint32_t Length;
28     /// The offset from the beginning of the .debug_info section of the
29     /// compilation unit entry referenced by the table.
30     uint32_t CuOffset;
31     /// The DWARF version number.
32     uint16_t Version;
33     /// The size in bytes of an address on the target architecture. For segmented
34     /// addressing, this is the size of the offset portion of the address.
35     uint8_t AddrSize;
36     /// The size in bytes of a segment descriptor on the target architecture.
37     /// If the target system uses a flat address space, this value is 0.
38     uint8_t SegSize;
39   };
40 
41   struct Descriptor {
42     uint64_t Address;
43     uint64_t Length;
44 
getEndAddressDescriptor45     uint64_t getEndAddress() const { return Address + Length; }
46     void dump(raw_ostream &OS, uint32_t AddressSize) const;
47   };
48 
49 private:
50   using DescriptorColl = std::vector<Descriptor>;
51   using desc_iterator_range = iterator_range<DescriptorColl::const_iterator>;
52 
53   uint32_t Offset;
54   Header HeaderData;
55   DescriptorColl ArangeDescriptors;
56 
57 public:
DWARFDebugArangeSet()58   DWARFDebugArangeSet() { clear(); }
59 
60   void clear();
61   bool extract(DataExtractor data, uint32_t *offset_ptr);
62   void dump(raw_ostream &OS) const;
63 
getCompileUnitDIEOffset()64   uint32_t getCompileUnitDIEOffset() const { return HeaderData.CuOffset; }
65 
getHeader()66   const Header &getHeader() const { return HeaderData; }
67 
descriptors()68   desc_iterator_range descriptors() const {
69     return desc_iterator_range(ArangeDescriptors.begin(),
70                                ArangeDescriptors.end());
71   }
72 };
73 
74 } // end namespace llvm
75 
76 #endif // LLVM_DEBUGINFO_DWARFDEBUGARANGESET_H
77