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 "DWARFDebugLoc.h"
11#include "llvm/Support/Compiler.h"
12#include "llvm/Support/Format.h"
13#include "llvm/Support/raw_ostream.h"
14#include "llvm/Support/Dwarf.h"
15
16using namespace llvm;
17
18void DWARFDebugLoc::dump(raw_ostream &OS) const {
19  for (const LocationList &L : Locations) {
20    OS << format("0x%8.8x: ", L.Offset);
21    const unsigned Indent = 12;
22    for (const Entry &E : L.Entries) {
23      if (&E != L.Entries.begin())
24        OS.indent(Indent);
25      OS << "Beginning address offset: " << format("0x%016" PRIx64, E.Begin)
26         << '\n';
27      OS.indent(Indent) << "   Ending address offset: "
28                        << format("0x%016" PRIx64, E.End) << '\n';
29      OS.indent(Indent) << "    Location description: ";
30      for (unsigned char Loc : E.Loc) {
31        OS << format("%2.2x ", Loc);
32      }
33      OS << "\n\n";
34    }
35  }
36}
37
38void DWARFDebugLoc::parse(DataExtractor data, unsigned AddressSize) {
39  uint32_t Offset = 0;
40  while (data.isValidOffset(Offset+AddressSize-1)) {
41    Locations.resize(Locations.size() + 1);
42    LocationList &Loc = Locations.back();
43    Loc.Offset = Offset;
44    // 2.6.2 Location Lists
45    // A location list entry consists of:
46    while (true) {
47      Entry E;
48      RelocAddrMap::const_iterator AI = RelocMap.find(Offset);
49      // 1. A beginning address offset. ...
50      E.Begin = data.getUnsigned(&Offset, AddressSize);
51      if (AI != RelocMap.end())
52        E.Begin += AI->second.second;
53
54      AI = RelocMap.find(Offset);
55      // 2. An ending address offset. ...
56      E.End = data.getUnsigned(&Offset, AddressSize);
57      if (AI != RelocMap.end())
58        E.End += AI->second.second;
59
60      // The end of any given location list is marked by an end of list entry,
61      // which consists of a 0 for the beginning address offset and a 0 for the
62      // ending address offset.
63      if (E.Begin == 0 && E.End == 0)
64        break;
65
66      unsigned Bytes = data.getU16(&Offset);
67      // A single location description describing the location of the object...
68      StringRef str = data.getData().substr(Offset, Bytes);
69      Offset += Bytes;
70      E.Loc.reserve(str.size());
71      std::copy(str.begin(), str.end(), std::back_inserter(E.Loc));
72      Loc.Entries.push_back(std::move(E));
73    }
74  }
75  if (data.isValidOffset(Offset))
76    llvm::errs() << "error: failed to consume entire .debug_loc section\n";
77}
78
79void DWARFDebugLocDWO::parse(DataExtractor data) {
80  uint32_t Offset = 0;
81  while (data.isValidOffset(Offset)) {
82    Locations.resize(Locations.size() + 1);
83    LocationList &Loc = Locations.back();
84    Loc.Offset = Offset;
85    dwarf::LocationListEntry Kind;
86    while ((Kind = static_cast<dwarf::LocationListEntry>(
87                data.getU8(&Offset))) != dwarf::DW_LLE_end_of_list_entry) {
88
89      if (Kind != dwarf::DW_LLE_start_length_entry) {
90        llvm::errs() << "error: dumping support for LLE of kind " << (int)Kind
91                     << " not implemented\n";
92        return;
93      }
94
95      Entry E;
96
97      E.Start = data.getULEB128(&Offset);
98      E.Length = data.getU32(&Offset);
99
100      unsigned Bytes = data.getU16(&Offset);
101      // A single location description describing the location of the object...
102      StringRef str = data.getData().substr(Offset, Bytes);
103      Offset += Bytes;
104      E.Loc.resize(str.size());
105      std::copy(str.begin(), str.end(), E.Loc.begin());
106
107      Loc.Entries.push_back(std::move(E));
108    }
109  }
110}
111
112void DWARFDebugLocDWO::dump(raw_ostream &OS) const {
113  for (const LocationList &L : Locations) {
114    OS << format("0x%8.8x: ", L.Offset);
115    const unsigned Indent = 12;
116    for (const Entry &E : L.Entries) {
117      if (&E != L.Entries.begin())
118        OS.indent(Indent);
119      OS << "Beginning address index: " << E.Start << '\n';
120      OS.indent(Indent) << "                 Length: " << E.Length << '\n';
121      OS.indent(Indent) << "   Location description: ";
122      for (unsigned char Loc : E.Loc)
123        OS << format("%2.2x ", Loc);
124      OS << "\n\n";
125    }
126  }
127}
128
129