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/ADT/SmallVector.h"
11 #include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
12 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
13 #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
14 #include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
15 #include "llvm/Support/Dwarf.h"
16 #include "llvm/Support/Compiler.h"
17 #include "llvm/Support/Format.h"
18 #include "llvm/Support/raw_ostream.h"
25 bool DWARFAcceleratorTable::extract() {
28 // Check that we can at least read the header.
29 if (!AccelSection.isValidOffset(offsetof(Header, HeaderDataLength)+4))
32 Hdr.Magic = AccelSection.getU32(&Offset);
33 Hdr.Version = AccelSection.getU16(&Offset);
34 Hdr.HashFunction = AccelSection.getU16(&Offset);
35 Hdr.NumBuckets = AccelSection.getU32(&Offset);
36 Hdr.NumHashes = AccelSection.getU32(&Offset);
37 Hdr.HeaderDataLength = AccelSection.getU32(&Offset);
39 // Check that we can read all the hashes and offsets from the
40 // section (see SourceLevelDebugging.rst for the structure of the index).
41 if (!AccelSection.isValidOffset(sizeof(Hdr) + Hdr.HeaderDataLength +
42 Hdr.NumBuckets*4 + Hdr.NumHashes*8))
45 HdrData.DIEOffsetBase = AccelSection.getU32(&Offset);
46 uint32_t NumAtoms = AccelSection.getU32(&Offset);
48 for (unsigned i = 0; i < NumAtoms; ++i) {
49 uint16_t AtomType = AccelSection.getU16(&Offset);
50 auto AtomForm = static_cast<dwarf::Form>(AccelSection.getU16(&Offset));
51 HdrData.Atoms.push_back(std::make_pair(AtomType, AtomForm));
57 LLVM_DUMP_METHOD void DWARFAcceleratorTable::dump(raw_ostream &OS) const {
59 OS << "Magic = " << format("0x%08x", Hdr.Magic) << '\n'
60 << "Version = " << format("0x%04x", Hdr.Version) << '\n'
61 << "Hash function = " << format("0x%08x", Hdr.HashFunction) << '\n'
62 << "Bucket count = " << Hdr.NumBuckets << '\n'
63 << "Hashes count = " << Hdr.NumHashes << '\n'
64 << "HeaderData length = " << Hdr.HeaderDataLength << '\n'
65 << "DIE offset base = " << HdrData.DIEOffsetBase << '\n'
66 << "Number of atoms = " << HdrData.Atoms.size() << '\n';
69 SmallVector<DWARFFormValue, 3> AtomForms;
70 for (const auto &Atom: HdrData.Atoms) {
71 OS << format("Atom[%d] Type: ", i++);
72 auto TypeString = dwarf::AtomTypeString(Atom.first);
73 if (!TypeString.empty())
76 OS << format("DW_ATOM_Unknown_0x%x", Atom.first);
78 auto FormString = dwarf::FormEncodingString(Atom.second);
79 if (!FormString.empty())
82 OS << format("DW_FORM_Unknown_0x%x", Atom.second);
84 AtomForms.push_back(DWARFFormValue(Atom.second));
87 // Now go through the actual tables and dump them.
88 uint32_t Offset = sizeof(Hdr) + Hdr.HeaderDataLength;
89 unsigned HashesBase = Offset + Hdr.NumBuckets * 4;
90 unsigned OffsetsBase = HashesBase + Hdr.NumHashes * 4;
92 for (unsigned Bucket = 0; Bucket < Hdr.NumBuckets; ++Bucket) {
93 unsigned Index = AccelSection.getU32(&Offset);
95 OS << format("Bucket[%d]\n", Bucket);
96 if (Index == UINT32_MAX) {
101 for (unsigned HashIdx = Index; HashIdx < Hdr.NumHashes; ++HashIdx) {
102 unsigned HashOffset = HashesBase + HashIdx*4;
103 unsigned OffsetsOffset = OffsetsBase + HashIdx*4;
104 uint32_t Hash = AccelSection.getU32(&HashOffset);
106 if (Hash % Hdr.NumBuckets != Bucket)
109 unsigned DataOffset = AccelSection.getU32(&OffsetsOffset);
110 OS << format(" Hash = 0x%08x Offset = 0x%08x\n", Hash, DataOffset);
111 if (!AccelSection.isValidOffset(DataOffset)) {
112 OS << " Invalid section offset\n";
115 while (AccelSection.isValidOffsetForDataOfSize(DataOffset, 4)) {
116 unsigned StringOffset =
117 getRelocatedValue(AccelSection, 4, &DataOffset, &Relocs);
120 OS << format(" Name: %08x \"%s\"\n", StringOffset,
121 StringSection.getCStr(&StringOffset));
122 unsigned NumData = AccelSection.getU32(&DataOffset);
123 for (unsigned Data = 0; Data < NumData; ++Data) {
124 OS << format(" Data[%d] => ", Data);
126 for (auto &Atom : AtomForms) {
127 OS << format("{Atom[%d]: ", i++);
128 if (Atom.extractValue(AccelSection, &DataOffset, nullptr))
131 OS << "Error extracting the value";