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//===- DWARFUnitIndex.cpp -------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/DWARF/DWARFUnitIndex.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <cinttypes>
#include <cstdint>
using namespace llvm;
bool DWARFUnitIndex::Header::parse(DataExtractor IndexData,
uint32_t *OffsetPtr) {
if (!IndexData.isValidOffsetForDataOfSize(*OffsetPtr, 16))
return false;
Version = IndexData.getU32(OffsetPtr);
NumColumns = IndexData.getU32(OffsetPtr);
NumUnits = IndexData.getU32(OffsetPtr);
NumBuckets = IndexData.getU32(OffsetPtr);
return Version <= 2;
}
void DWARFUnitIndex::Header::dump(raw_ostream &OS) const {
OS << format("version = %u slots = %u\n\n", Version, NumBuckets);
}
bool DWARFUnitIndex::parse(DataExtractor IndexData) {
bool b = parseImpl(IndexData);
if (!b) {
// Make sure we don't try to dump anything
Header.NumBuckets = 0;
// Release any partially initialized data.
ColumnKinds.reset();
Rows.reset();
}
return b;
}
bool DWARFUnitIndex::parseImpl(DataExtractor IndexData) {
uint32_t Offset = 0;
if (!Header.parse(IndexData, &Offset))
return false;
if (!IndexData.isValidOffsetForDataOfSize(
Offset, Header.NumBuckets * (8 + 4) +
(2 * Header.NumUnits + 1) * 4 * Header.NumColumns))
return false;
Rows = llvm::make_unique<Entry[]>(Header.NumBuckets);
auto Contribs =
llvm::make_unique<Entry::SectionContribution *[]>(Header.NumUnits);
ColumnKinds = llvm::make_unique<DWARFSectionKind[]>(Header.NumColumns);
// Read Hash Table of Signatures
for (unsigned i = 0; i != Header.NumBuckets; ++i)
Rows[i].Signature = IndexData.getU64(&Offset);
// Read Parallel Table of Indexes
for (unsigned i = 0; i != Header.NumBuckets; ++i) {
auto Index = IndexData.getU32(&Offset);
if (!Index)
continue;
Rows[i].Index = this;
Rows[i].Contributions =
llvm::make_unique<Entry::SectionContribution[]>(Header.NumColumns);
Contribs[Index - 1] = Rows[i].Contributions.get();
}
// Read the Column Headers
for (unsigned i = 0; i != Header.NumColumns; ++i) {
ColumnKinds[i] = static_cast<DWARFSectionKind>(IndexData.getU32(&Offset));
if (ColumnKinds[i] == InfoColumnKind) {
if (InfoColumn != -1)
return false;
InfoColumn = i;
}
}
if (InfoColumn == -1)
return false;
// Read Table of Section Offsets
for (unsigned i = 0; i != Header.NumUnits; ++i) {
auto *Contrib = Contribs[i];
for (unsigned i = 0; i != Header.NumColumns; ++i)
Contrib[i].Offset = IndexData.getU32(&Offset);
}
// Read Table of Section Sizes
for (unsigned i = 0; i != Header.NumUnits; ++i) {
auto *Contrib = Contribs[i];
for (unsigned i = 0; i != Header.NumColumns; ++i)
Contrib[i].Length = IndexData.getU32(&Offset);
}
return true;
}
StringRef DWARFUnitIndex::getColumnHeader(DWARFSectionKind DS) {
#define CASE(DS) \
case DW_SECT_##DS: \
return #DS;
switch (DS) {
CASE(INFO);
CASE(TYPES);
CASE(ABBREV);
CASE(LINE);
CASE(LOC);
CASE(STR_OFFSETS);
CASE(MACINFO);
CASE(MACRO);
}
llvm_unreachable("unknown DWARFSectionKind");
}
void DWARFUnitIndex::dump(raw_ostream &OS) const {
if (!*this)
return;
Header.dump(OS);
OS << "Index Signature ";
for (unsigned i = 0; i != Header.NumColumns; ++i)
OS << ' ' << left_justify(getColumnHeader(ColumnKinds[i]), 24);
OS << "\n----- ------------------";
for (unsigned i = 0; i != Header.NumColumns; ++i)
OS << " ------------------------";
OS << '\n';
for (unsigned i = 0; i != Header.NumBuckets; ++i) {
auto &Row = Rows[i];
if (auto *Contribs = Row.Contributions.get()) {
OS << format("%5u 0x%016" PRIx64 " ", i + 1, Row.Signature);
for (unsigned i = 0; i != Header.NumColumns; ++i) {
auto &Contrib = Contribs[i];
OS << format("[0x%08x, 0x%08x) ", Contrib.Offset,
Contrib.Offset + Contrib.Length);
}
OS << '\n';
}
}
}
const DWARFUnitIndex::Entry::SectionContribution *
DWARFUnitIndex::Entry::getOffset(DWARFSectionKind Sec) const {
uint32_t i = 0;
for (; i != Index->Header.NumColumns; ++i)
if (Index->ColumnKinds[i] == Sec)
return &Contributions[i];
return nullptr;
}
const DWARFUnitIndex::Entry::SectionContribution *
DWARFUnitIndex::Entry::getOffset() const {
return &Contributions[Index->InfoColumn];
}
const DWARFUnitIndex::Entry *
DWARFUnitIndex::getFromOffset(uint32_t Offset) const {
if (OffsetLookup.empty()) {
for (uint32_t i = 0; i != Header.NumBuckets; ++i)
if (Rows[i].Contributions)
OffsetLookup.push_back(&Rows[i]);
llvm::sort(OffsetLookup, [&](Entry *E1, Entry *E2) {
return E1->Contributions[InfoColumn].Offset <
E2->Contributions[InfoColumn].Offset;
});
}
auto I = partition_point(OffsetLookup, [&](Entry *E2) {
return E2->Contributions[InfoColumn].Offset <= Offset;
});
if (I == OffsetLookup.begin())
return nullptr;
--I;
const auto *E = *I;
const auto &InfoContrib = E->Contributions[InfoColumn];
if ((InfoContrib.Offset + InfoContrib.Length) <= Offset)
return nullptr;
return E;
}
const DWARFUnitIndex::Entry *DWARFUnitIndex::getFromHash(uint64_t S) const {
uint64_t Mask = Header.NumBuckets - 1;
auto H = S & Mask;
auto HP = ((S >> 32) & Mask) | 1;
while (Rows[H].getSignature() != S && Rows[H].getSignature() != 0)
H = (H + HP) & Mask;
if (Rows[H].getSignature() != S)
return nullptr;
return &Rows[H];
}
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