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//===- Analyze.cpp - PDB analysis functions ---------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Analyze.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/DebugInfo/CodeView/CVTypeVisitor.h"
#include "llvm/DebugInfo/CodeView/LazyRandomTypeCollection.h"
#include "llvm/DebugInfo/CodeView/TypeRecord.h"
#include "llvm/DebugInfo/CodeView/TypeVisitorCallbacks.h"
#include "llvm/DebugInfo/PDB/Native/PDBFile.h"
#include "llvm/DebugInfo/PDB/Native/RawError.h"
#include "llvm/DebugInfo/PDB/Native/TpiStream.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/raw_ostream.h"
#include <list>
using namespace llvm;
using namespace llvm::codeview;
using namespace llvm::pdb;
static StringRef getLeafTypeName(TypeLeafKind LT) {
switch (LT) {
#define TYPE_RECORD(ename, value, name) \
case ename: \
return #name;
#include "llvm/DebugInfo/CodeView/CodeViewTypes.def"
default:
break;
}
return "UnknownLeaf";
}
namespace {
struct HashLookupVisitor : public TypeVisitorCallbacks {
struct Entry {
TypeIndex TI;
CVType Record;
};
explicit HashLookupVisitor(TpiStream &Tpi) : Tpi(Tpi) {}
Error visitTypeBegin(CVType &Record) override {
uint32_t H = Tpi.getHashValues()[I];
Record.Hash = H;
TypeIndex TI(I + TypeIndex::FirstNonSimpleIndex);
Lookup[H].push_back(Entry{TI, Record});
++I;
return Error::success();
}
uint32_t I = 0;
DenseMap<uint32_t, std::list<Entry>> Lookup;
TpiStream &Tpi;
};
}
AnalysisStyle::AnalysisStyle(PDBFile &File) : File(File) {}
Error AnalysisStyle::dump() {
auto Tpi = File.getPDBTpiStream();
if (!Tpi)
return Tpi.takeError();
HashLookupVisitor Hasher(*Tpi);
uint32_t RecordCount = Tpi->getNumTypeRecords();
auto Offsets = Tpi->getTypeIndexOffsets();
auto Types = llvm::make_unique<LazyRandomTypeCollection>(
Tpi->typeArray(), RecordCount, Offsets);
if (auto EC = codeview::visitTypeStream(*Types, Hasher))
return EC;
auto &Adjusters = Tpi->getHashAdjusters();
DenseSet<uint32_t> AdjusterSet;
for (const auto &Adj : Adjusters) {
assert(AdjusterSet.find(Adj.second) == AdjusterSet.end());
AdjusterSet.insert(Adj.second);
}
uint32_t Count = 0;
outs() << "Searching for hash collisions\n";
for (const auto &H : Hasher.Lookup) {
if (H.second.size() <= 1)
continue;
++Count;
outs() << formatv("Hash: {0}, Count: {1} records\n", H.first,
H.second.size());
for (const auto &R : H.second) {
auto Iter = AdjusterSet.find(R.TI.getIndex());
StringRef Prefix;
if (Iter != AdjusterSet.end()) {
Prefix = "[HEAD]";
AdjusterSet.erase(Iter);
}
StringRef LeafName = getLeafTypeName(R.Record.Type);
uint32_t TI = R.TI.getIndex();
StringRef TypeName = Types->getTypeName(R.TI);
outs() << formatv("{0,-6} {1} ({2:x}) {3}\n", Prefix, LeafName, TI,
TypeName);
}
}
outs() << "\n";
outs() << "Dumping hash adjustment chains\n";
for (const auto &A : Tpi->getHashAdjusters()) {
TypeIndex TI(A.second);
StringRef TypeName = Types->getTypeName(TI);
const CVType &HeadRecord = Types->getType(TI);
assert(HeadRecord.Hash.hasValue());
auto CollisionsIter = Hasher.Lookup.find(*HeadRecord.Hash);
if (CollisionsIter == Hasher.Lookup.end())
continue;
const auto &Collisions = CollisionsIter->second;
outs() << TypeName << "\n";
outs() << formatv(" [HEAD] {0:x} {1} {2}\n", uint32_t(A.second),
getLeafTypeName(HeadRecord.Type), TypeName);
for (const auto &Chain : Collisions) {
if (Chain.TI == TI)
continue;
const CVType &TailRecord = Types->getType(Chain.TI);
outs() << formatv(" {0:x} {1} {2}\n", Chain.TI.getIndex(),
getLeafTypeName(TailRecord.Type),
Types->getTypeName(Chain.TI));
}
}
outs() << formatv("There are {0} orphaned hash adjusters\n",
AdjusterSet.size());
for (const auto &Adj : AdjusterSet) {
outs() << formatv(" {0}\n", Adj);
}
uint32_t DistinctHashValues = Hasher.Lookup.size();
outs() << formatv("{0}/{1} hash collisions", Count, DistinctHashValues);
return Error::success();
}
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