LLVM  4.0.0
DWARFDebugRangeList.h
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1 //===-- DWARFDebugRangeList.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_DWARFDEBUGRANGELIST_H
11 #define LLVM_LIB_DEBUGINFO_DWARFDEBUGRANGELIST_H
12 
14 #include <vector>
15 
16 namespace llvm {
17 
19 
20 /// DWARFAddressRangesVector - represents a set of absolute address ranges.
21 typedef std::vector<std::pair<uint64_t, uint64_t>> DWARFAddressRangesVector;
22 
24 public:
25  struct RangeListEntry {
26  // A beginning address offset. This address offset has the size of an
27  // address and is relative to the applicable base address of the
28  // compilation unit referencing this range list. It marks the beginning
29  // of an address range.
30  uint64_t StartAddress;
31  // An ending address offset. This address offset again has the size of
32  // an address and is relative to the applicable base address of the
33  // compilation unit referencing this range list. It marks the first
34  // address past the end of the address range. The ending address must
35  // be greater than or equal to the beginning address.
36  uint64_t EndAddress;
37  // The end of any given range list is marked by an end of list entry,
38  // which consists of a 0 for the beginning address offset
39  // and a 0 for the ending address offset.
40  bool isEndOfListEntry() const {
41  return (StartAddress == 0) && (EndAddress == 0);
42  }
43  // A base address selection entry consists of:
44  // 1. The value of the largest representable address offset
45  // (for example, 0xffffffff when the size of an address is 32 bits).
46  // 2. An address, which defines the appropriate base address for
47  // use in interpreting the beginning and ending address offsets of
48  // subsequent entries of the location list.
49  bool isBaseAddressSelectionEntry(uint8_t AddressSize) const {
50  assert(AddressSize == 4 || AddressSize == 8);
51  if (AddressSize == 4)
52  return StartAddress == -1U;
53  else
54  return StartAddress == -1ULL;
55  }
56  };
57 
58 private:
59  // Offset in .debug_ranges section.
60  uint32_t Offset;
61  uint8_t AddressSize;
62  std::vector<RangeListEntry> Entries;
63 
64 public:
66  void clear();
67  void dump(raw_ostream &OS) const;
68  bool extract(DataExtractor data, uint32_t *offset_ptr);
69  const std::vector<RangeListEntry> &getEntries() { return Entries; }
70 
71  /// getAbsoluteRanges - Returns absolute address ranges defined by this range
72  /// list. Has to be passed base address of the compile unit referencing this
73  /// range list.
74  DWARFAddressRangesVector getAbsoluteRanges(uint64_t BaseAddress) const;
75 };
76 
77 } // namespace llvm
78 
79 #endif // LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H
std::vector< std::pair< uint64_t, uint64_t > > DWARFAddressRangesVector
DWARFAddressRangesVector - represents a set of absolute address ranges.
const std::vector< RangeListEntry > & getEntries()
bool isBaseAddressSelectionEntry(uint8_t AddressSize) const
bool extract(DataExtractor data, uint32_t *offset_ptr)
DWARFAddressRangesVector getAbsoluteRanges(uint64_t BaseAddress) const
getAbsoluteRanges - Returns absolute address ranges defined by this range list.
void dump(raw_ostream &OS) const
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:44