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1 //===-- DWARFDebugLoc.cpp -------------------------------------------------===//
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 #include "llvm/DebugInfo/DWARF/DWARFDebugLoc.h"
11 #include "llvm/Support/Dwarf.h"
12 #include "llvm/Support/Format.h"
13 #include "llvm/Support/raw_ostream.h"
14 
15 using namespace llvm;
16 
dump(raw_ostream & OS) const17 void DWARFDebugLoc::dump(raw_ostream &OS) const {
18   for (const LocationList &L : Locations) {
19     OS << format("0x%8.8x: ", L.Offset);
20     const unsigned Indent = 12;
21     for (const Entry &E : L.Entries) {
22       if (&E != L.Entries.begin())
23         OS.indent(Indent);
24       OS << "Beginning address offset: " << format("0x%016" PRIx64, E.Begin)
25          << '\n';
26       OS.indent(Indent) << "   Ending address offset: "
27                         << format("0x%016" PRIx64, E.End) << '\n';
28       OS.indent(Indent) << "    Location description: ";
29       for (unsigned char Loc : E.Loc) {
30         OS << format("%2.2x ", Loc);
31       }
32       OS << "\n\n";
33     }
34   }
35 }
36 
parse(DataExtractor data,unsigned AddressSize)37 void DWARFDebugLoc::parse(DataExtractor data, unsigned AddressSize) {
38   uint32_t Offset = 0;
39   while (data.isValidOffset(Offset+AddressSize-1)) {
40     Locations.resize(Locations.size() + 1);
41     LocationList &Loc = Locations.back();
42     Loc.Offset = Offset;
43     // 2.6.2 Location Lists
44     // A location list entry consists of:
45     while (true) {
46       Entry E;
47       RelocAddrMap::const_iterator AI = RelocMap.find(Offset);
48       // 1. A beginning address offset. ...
49       E.Begin = data.getUnsigned(&Offset, AddressSize);
50       if (AI != RelocMap.end())
51         E.Begin += AI->second.second;
52 
53       AI = RelocMap.find(Offset);
54       // 2. An ending address offset. ...
55       E.End = data.getUnsigned(&Offset, AddressSize);
56       if (AI != RelocMap.end())
57         E.End += AI->second.second;
58 
59       // The end of any given location list is marked by an end of list entry,
60       // which consists of a 0 for the beginning address offset and a 0 for the
61       // ending address offset.
62       if (E.Begin == 0 && E.End == 0)
63         break;
64 
65       unsigned Bytes = data.getU16(&Offset);
66       // A single location description describing the location of the object...
67       StringRef str = data.getData().substr(Offset, Bytes);
68       Offset += Bytes;
69       E.Loc.append(str.begin(), str.end());
70       Loc.Entries.push_back(std::move(E));
71     }
72   }
73   if (data.isValidOffset(Offset))
74     llvm::errs() << "error: failed to consume entire .debug_loc section\n";
75 }
76 
parse(DataExtractor data)77 void DWARFDebugLocDWO::parse(DataExtractor data) {
78   uint32_t Offset = 0;
79   while (data.isValidOffset(Offset)) {
80     Locations.resize(Locations.size() + 1);
81     LocationList &Loc = Locations.back();
82     Loc.Offset = Offset;
83     dwarf::LocationListEntry Kind;
84     while ((Kind = static_cast<dwarf::LocationListEntry>(
85                 data.getU8(&Offset))) != dwarf::DW_LLE_end_of_list_entry) {
86 
87       if (Kind != dwarf::DW_LLE_start_length_entry) {
88         llvm::errs() << "error: dumping support for LLE of kind " << (int)Kind
89                      << " not implemented\n";
90         return;
91       }
92 
93       Entry E;
94 
95       E.Start = data.getULEB128(&Offset);
96       E.Length = data.getU32(&Offset);
97 
98       unsigned Bytes = data.getU16(&Offset);
99       // A single location description describing the location of the object...
100       StringRef str = data.getData().substr(Offset, Bytes);
101       Offset += Bytes;
102       E.Loc.resize(str.size());
103       std::copy(str.begin(), str.end(), E.Loc.begin());
104 
105       Loc.Entries.push_back(std::move(E));
106     }
107   }
108 }
109 
dump(raw_ostream & OS) const110 void DWARFDebugLocDWO::dump(raw_ostream &OS) const {
111   for (const LocationList &L : Locations) {
112     OS << format("0x%8.8x: ", L.Offset);
113     const unsigned Indent = 12;
114     for (const Entry &E : L.Entries) {
115       if (&E != L.Entries.begin())
116         OS.indent(Indent);
117       OS << "Beginning address index: " << E.Start << '\n';
118       OS.indent(Indent) << "                 Length: " << E.Length << '\n';
119       OS.indent(Indent) << "   Location description: ";
120       for (unsigned char Loc : E.Loc)
121         OS << format("%2.2x ", Loc);
122       OS << "\n\n";
123     }
124   }
125 }
126 
127