1 //===--- DWARFAcceleratorTable.cpp ----------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
11 #include "llvm/Support/Dwarf.h"
12 #include "llvm/Support/Format.h"
13 #include "llvm/Support/raw_ostream.h"
17 bool DWARFAcceleratorTable::extract() {
20 // Check that we can at least read the header.
21 if (!AccelSection.isValidOffset(offsetof(Header, HeaderDataLength)+4))
24 Hdr.Magic = AccelSection.getU32(&Offset);
25 Hdr.Version = AccelSection.getU16(&Offset);
26 Hdr.HashFunction = AccelSection.getU16(&Offset);
27 Hdr.NumBuckets = AccelSection.getU32(&Offset);
28 Hdr.NumHashes = AccelSection.getU32(&Offset);
29 Hdr.HeaderDataLength = AccelSection.getU32(&Offset);
31 // Check that we can read all the hashes and offsets from the
32 // section (see SourceLevelDebugging.rst for the structure of the index).
33 if (!AccelSection.isValidOffset(sizeof(Hdr) + Hdr.HeaderDataLength +
34 Hdr.NumBuckets*4 + Hdr.NumHashes*8))
37 HdrData.DIEOffsetBase = AccelSection.getU32(&Offset);
38 uint32_t NumAtoms = AccelSection.getU32(&Offset);
40 for (unsigned i = 0; i < NumAtoms; ++i) {
41 uint16_t AtomType = AccelSection.getU16(&Offset);
42 auto AtomForm = static_cast<dwarf::Form>(AccelSection.getU16(&Offset));
43 HdrData.Atoms.push_back(std::make_pair(AtomType, AtomForm));
49 void DWARFAcceleratorTable::dump(raw_ostream &OS) const {
51 OS << "Magic = " << format("0x%08x", Hdr.Magic) << '\n'
52 << "Version = " << format("0x%04x", Hdr.Version) << '\n'
53 << "Hash function = " << format("0x%08x", Hdr.HashFunction) << '\n'
54 << "Bucket count = " << Hdr.NumBuckets << '\n'
55 << "Hashes count = " << Hdr.NumHashes << '\n'
56 << "HeaderData length = " << Hdr.HeaderDataLength << '\n'
57 << "DIE offset base = " << HdrData.DIEOffsetBase << '\n'
58 << "Number of atoms = " << HdrData.Atoms.size() << '\n';
61 SmallVector<DWARFFormValue, 3> AtomForms;
62 for (const auto &Atom: HdrData.Atoms) {
63 OS << format("Atom[%d] Type: ", i++);
64 auto TypeString = dwarf::AtomTypeString(Atom.first);
65 if (!TypeString.empty())
68 OS << format("DW_ATOM_Unknown_0x%x", Atom.first);
70 auto FormString = dwarf::FormEncodingString(Atom.second);
71 if (!FormString.empty())
74 OS << format("DW_FORM_Unknown_0x%x", Atom.second);
76 AtomForms.push_back(DWARFFormValue(Atom.second));
79 // Now go through the actual tables and dump them.
80 uint32_t Offset = sizeof(Hdr) + Hdr.HeaderDataLength;
81 unsigned HashesBase = Offset + Hdr.NumBuckets * 4;
82 unsigned OffsetsBase = HashesBase + Hdr.NumHashes * 4;
84 for (unsigned Bucket = 0; Bucket < Hdr.NumBuckets; ++Bucket) {
85 unsigned Index = AccelSection.getU32(&Offset);
87 OS << format("Bucket[%d]\n", Bucket);
88 if (Index == UINT32_MAX) {
93 for (unsigned HashIdx = Index; HashIdx < Hdr.NumHashes; ++HashIdx) {
94 unsigned HashOffset = HashesBase + HashIdx*4;
95 unsigned OffsetsOffset = OffsetsBase + HashIdx*4;
96 uint32_t Hash = AccelSection.getU32(&HashOffset);
98 if (Hash % Hdr.NumBuckets != Bucket)
101 unsigned DataOffset = AccelSection.getU32(&OffsetsOffset);
102 OS << format(" Hash = 0x%08x Offset = 0x%08x\n", Hash, DataOffset);
103 if (!AccelSection.isValidOffset(DataOffset)) {
104 OS << " Invalid section offset\n";
107 while (AccelSection.isValidOffsetForDataOfSize(DataOffset, 4)) {
108 unsigned StringOffset = AccelSection.getU32(&DataOffset);
109 RelocAddrMap::const_iterator Reloc = Relocs.find(DataOffset-4);
110 if (Reloc != Relocs.end())
111 StringOffset += Reloc->second.second;
114 OS << format(" Name: %08x \"%s\"\n", StringOffset,
115 StringSection.getCStr(&StringOffset));
116 unsigned NumData = AccelSection.getU32(&DataOffset);
117 for (unsigned Data = 0; Data < NumData; ++Data) {
118 OS << format(" Data[%d] => ", Data);
120 for (auto &Atom : AtomForms) {
121 OS << format("{Atom[%d]: ", i++);
122 if (Atom.extractValue(AccelSection, &DataOffset, nullptr))
125 OS << "Error extracting the value";