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