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//===--- DWARFAcceleratorTable.cpp ----------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
bool DWARFAcceleratorTable::extract() {
uint32_t Offset = 0;
// Check that we can at least read the header.
if (!AccelSection.isValidOffset(offsetof(Header, HeaderDataLength)+4))
return false;
Hdr.Magic = AccelSection.getU32(&Offset);
Hdr.Version = AccelSection.getU16(&Offset);
Hdr.HashFunction = AccelSection.getU16(&Offset);
Hdr.NumBuckets = AccelSection.getU32(&Offset);
Hdr.NumHashes = AccelSection.getU32(&Offset);
Hdr.HeaderDataLength = AccelSection.getU32(&Offset);
// Check that we can read all the hashes and offsets from the
// section (see SourceLevelDebugging.rst for the structure of the index).
if (!AccelSection.isValidOffset(sizeof(Hdr) + Hdr.HeaderDataLength +
Hdr.NumBuckets*4 + Hdr.NumHashes*8))
return false;
HdrData.DIEOffsetBase = AccelSection.getU32(&Offset);
uint32_t NumAtoms = AccelSection.getU32(&Offset);
for (unsigned i = 0; i < NumAtoms; ++i) {
uint16_t AtomType = AccelSection.getU16(&Offset);
uint16_t AtomForm = AccelSection.getU16(&Offset);
HdrData.Atoms.push_back(std::make_pair(AtomType, AtomForm));
}
return true;
}
void DWARFAcceleratorTable::dump(raw_ostream &OS) const {
// Dump the header.
OS << "Magic = " << format("0x%08x", Hdr.Magic) << '\n'
<< "Version = " << format("0x%04x", Hdr.Version) << '\n'
<< "Hash function = " << format("0x%08x", Hdr.HashFunction) << '\n'
<< "Bucket count = " << Hdr.NumBuckets << '\n'
<< "Hashes count = " << Hdr.NumHashes << '\n'
<< "HeaderData length = " << Hdr.HeaderDataLength << '\n'
<< "DIE offset base = " << HdrData.DIEOffsetBase << '\n'
<< "Number of atoms = " << HdrData.Atoms.size() << '\n';
unsigned i = 0;
SmallVector<DWARFFormValue, 3> AtomForms;
for (const auto &Atom: HdrData.Atoms) {
OS << format("Atom[%d] Type: ", i++);
if (const char *TypeString = dwarf::AtomTypeString(Atom.first))
OS << TypeString;
else
OS << format("DW_ATOM_Unknown_0x%x", Atom.first);
OS << " Form: ";
if (const char *FormString = dwarf::FormEncodingString(Atom.second))
OS << FormString;
else
OS << format("DW_FORM_Unknown_0x%x", Atom.second);
OS << '\n';
AtomForms.push_back(DWARFFormValue(Atom.second));
}
// Now go through the actual tables and dump them.
uint32_t Offset = sizeof(Hdr) + Hdr.HeaderDataLength;
unsigned HashesBase = Offset + Hdr.NumBuckets * 4;
unsigned OffsetsBase = HashesBase + Hdr.NumHashes * 4;
for (unsigned Bucket = 0; Bucket < Hdr.NumBuckets; ++Bucket) {
unsigned Index = AccelSection.getU32(&Offset);
OS << format("Bucket[%d]\n", Bucket);
if (Index == UINT32_MAX) {
OS << " EMPTY\n";
continue;
}
for (unsigned HashIdx = Index; HashIdx < Hdr.NumHashes; ++HashIdx) {
unsigned HashOffset = HashesBase + HashIdx*4;
unsigned OffsetsOffset = OffsetsBase + HashIdx*4;
uint32_t Hash = AccelSection.getU32(&HashOffset);
if (Hash % Hdr.NumBuckets != Bucket)
break;
unsigned DataOffset = AccelSection.getU32(&OffsetsOffset);
OS << format(" Hash = 0x%08x Offset = 0x%08x\n", Hash, DataOffset);
if (!AccelSection.isValidOffset(DataOffset)) {
OS << " Invalid section offset\n";
continue;
}
while (AccelSection.isValidOffsetForDataOfSize(DataOffset, 4)) {
unsigned StringOffset = AccelSection.getU32(&DataOffset);
RelocAddrMap::const_iterator Reloc = Relocs.find(DataOffset-4);
if (Reloc != Relocs.end())
StringOffset += Reloc->second.second;
if (!StringOffset)
break;
OS << format(" Name: %08x \"%s\"\n", StringOffset,
StringSection.getCStr(&StringOffset));
unsigned NumData = AccelSection.getU32(&DataOffset);
for (unsigned Data = 0; Data < NumData; ++Data) {
OS << format(" Data[%d] => ", Data);
unsigned i = 0;
for (auto &Atom : AtomForms) {
OS << format("{Atom[%d]: ", i++);
if (Atom.extractValue(AccelSection, &DataOffset, nullptr))
Atom.dump(OS, nullptr);
else
OS << "Error extracting the value";
OS << "} ";
}
OS << '\n';
}
}
}
}
}
}
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