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
15using namespace llvm;
16
17void DWARFDebugLoc::dump(raw_ostream &OS) const {
18  for (LocationLists::const_iterator I = Locations.begin(), E = Locations.end(); I != E; ++I) {
19    OS << format("0x%8.8x: ", I->Offset);
20    const unsigned Indent = 12;
21    for (SmallVectorImpl<Entry>::const_iterator I2 = I->Entries.begin(), E2 = I->Entries.end(); I2 != E2; ++I2) {
22      if (I2 != I->Entries.begin())
23        OS.indent(Indent);
24      OS << "Beginning address offset: " << format("0x%016" PRIx64, I2->Begin)
25         << '\n';
26      OS.indent(Indent) << "   Ending address offset: "
27                        << format("0x%016" PRIx64, I2->End) << '\n';
28      OS.indent(Indent) << "    Location description: ";
29      for (SmallVectorImpl<unsigned char>::const_iterator I3 = I2->Loc.begin(), E3 = I2->Loc.end(); I3 != E3; ++I3) {
30        OS << format("%2.2x ", *I3);
31      }
32      OS << "\n\n";
33    }
34  }
35}
36
37void DWARFDebugLoc::parse(DataExtractor data, unsigned AddressSize) {
38  uint32_t Offset = 0;
39  while (data.isValidOffset(Offset)) {
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.reserve(str.size());
70      std::copy(str.begin(), str.end(), std::back_inserter(E.Loc));
71      Loc.Entries.push_back(llvm_move(E));
72    }
73  }
74}
75