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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 | ||
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10 | #ifndef LLVM_LIB_DEBUGINFO_DWARFDEBUGRANGELIST_H |
11 | #define LLVM_LIB_DEBUGINFO_DWARFDEBUGRANGELIST_H | |
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12 | |
13 | #include "llvm/Support/DataExtractor.h" | |
14 | #include <vector> | |
15 | ||
16 | namespace llvm { | |
17 | ||
18 | class raw_ostream; | |
19 | ||
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20 | /// DWARFAddressRangesVector - represents a set of absolute address ranges. |
21 | typedef std::vector<std::pair<uint64_t, uint64_t>> DWARFAddressRangesVector; | |
22 | ||
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23 | class DWARFDebugRangeList { |
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 | } | |
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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: | |
65 | DWARFDebugRangeList() { clear(); } | |
66 | void clear(); | |
67 | void dump(raw_ostream &OS) const; | |
68 | bool extract(DataExtractor data, uint32_t *offset_ptr); | |
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69 | /// getAbsoluteRanges - Returns absolute address ranges defined by this range |
70 | /// list. Has to be passed base address of the compile unit referencing this | |
71 | /// range list. | |
72 | DWARFAddressRangesVector getAbsoluteRanges(uint64_t BaseAddress) const; | |
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73 | }; |
74 | ||
75 | } // namespace llvm | |
76 | ||
77 | #endif // LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H |