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llvm-mirror/tools/llvm-pdbutil/ExplainOutputStyle.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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18 KiB
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//===- ExplainOutputStyle.cpp --------------------------------- *- C++ --*-===//
//
// 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 "ExplainOutputStyle.h"
#include "FormatUtil.h"
#include "InputFile.h"
#include "StreamUtil.h"
#include "llvm-pdbutil.h"
#include "llvm/DebugInfo/CodeView/Formatters.h"
#include "llvm/DebugInfo/MSF/MappedBlockStream.h"
#include "llvm/DebugInfo/PDB/Native/DbiStream.h"
#include "llvm/DebugInfo/PDB/Native/InfoStream.h"
#include "llvm/DebugInfo/PDB/Native/PDBFile.h"
#include "llvm/DebugInfo/PDB/Native/RawTypes.h"
#include "llvm/Support/BinaryByteStream.h"
#include "llvm/Support/BinaryStreamArray.h"
#include "llvm/Support/Error.h"
using namespace llvm;
using namespace llvm::codeview;
using namespace llvm::msf;
using namespace llvm::pdb;
ExplainOutputStyle::ExplainOutputStyle(InputFile &File, uint64_t FileOffset)
: File(File), FileOffset(FileOffset), P(2, false, outs()) {}
Error ExplainOutputStyle::dump() {
P.formatLine("Explaining file offset {0} of file '{1}'.", FileOffset,
File.getFilePath());
if (File.isPdb())
return explainPdbFile();
return explainBinaryFile();
}
Error ExplainOutputStyle::explainPdbFile() {
bool IsAllocated = explainPdbBlockStatus();
if (!IsAllocated)
return Error::success();
AutoIndent Indent(P);
if (isPdbSuperBlock())
explainPdbSuperBlockOffset();
else if (isPdbFpmBlock())
explainPdbFpmBlockOffset();
else if (isPdbBlockMapBlock())
explainPdbBlockMapOffset();
else if (isPdbStreamDirectoryBlock())
explainPdbStreamDirectoryOffset();
else if (auto Index = getPdbBlockStreamIndex())
explainPdbStreamOffset(*Index);
else
explainPdbUnknownBlock();
return Error::success();
}
Error ExplainOutputStyle::explainBinaryFile() {
std::unique_ptr<BinaryByteStream> Stream =
llvm::make_unique<BinaryByteStream>(File.unknown().getBuffer(),
llvm::support::little);
switch (opts::explain::InputType) {
case opts::explain::InputFileType::DBIStream: {
DbiStream Dbi(std::move(Stream));
if (auto EC = Dbi.reload(nullptr))
return EC;
explainStreamOffset(Dbi, FileOffset);
break;
}
case opts::explain::InputFileType::PDBStream: {
InfoStream Info(std::move(Stream));
if (auto EC = Info.reload())
return EC;
explainStreamOffset(Info, FileOffset);
break;
}
default:
llvm_unreachable("Invalid input file type!");
}
return Error::success();
}
uint32_t ExplainOutputStyle::pdbBlockIndex() const {
return FileOffset / File.pdb().getBlockSize();
}
uint32_t ExplainOutputStyle::pdbBlockOffset() const {
uint64_t BlockStart = pdbBlockIndex() * File.pdb().getBlockSize();
assert(FileOffset >= BlockStart);
return FileOffset - BlockStart;
}
bool ExplainOutputStyle::isPdbSuperBlock() const {
return pdbBlockIndex() == 0;
}
bool ExplainOutputStyle::isPdbFpm1() const {
return ((pdbBlockIndex() - 1) % File.pdb().getBlockSize() == 0);
}
bool ExplainOutputStyle::isPdbFpm2() const {
return ((pdbBlockIndex() - 2) % File.pdb().getBlockSize() == 0);
}
bool ExplainOutputStyle::isPdbFpmBlock() const {
return isPdbFpm1() || isPdbFpm2();
}
bool ExplainOutputStyle::isPdbBlockMapBlock() const {
return pdbBlockIndex() == File.pdb().getBlockMapIndex();
}
bool ExplainOutputStyle::isPdbStreamDirectoryBlock() const {
const auto &Layout = File.pdb().getMsfLayout();
return llvm::is_contained(Layout.DirectoryBlocks, pdbBlockIndex());
}
Optional<uint32_t> ExplainOutputStyle::getPdbBlockStreamIndex() const {
const auto &Layout = File.pdb().getMsfLayout();
for (const auto &Entry : enumerate(Layout.StreamMap)) {
if (!llvm::is_contained(Entry.value(), pdbBlockIndex()))
continue;
return Entry.index();
}
return None;
}
bool ExplainOutputStyle::explainPdbBlockStatus() {
if (FileOffset >= File.pdb().getFileSize()) {
P.formatLine("Address {0} is not in the file (file size = {1}).",
FileOffset, File.pdb().getFileSize());
return false;
}
P.formatLine("Block:Offset = {2:X-}:{1:X-4}.", FileOffset, pdbBlockOffset(),
pdbBlockIndex());
bool IsFree = File.pdb().getMsfLayout().FreePageMap[pdbBlockIndex()];
P.formatLine("Address is in block {0} ({1}allocated).", pdbBlockIndex(),
IsFree ? "un" : "");
return !IsFree;
}
#define endof(Class, Field) (offsetof(Class, Field) + sizeof(Class::Field))
void ExplainOutputStyle::explainPdbSuperBlockOffset() {
P.formatLine("This corresponds to offset {0} of the MSF super block, ",
pdbBlockOffset());
if (pdbBlockOffset() < endof(SuperBlock, MagicBytes))
P.printLine("which is part of the MSF file magic.");
else if (pdbBlockOffset() < endof(SuperBlock, BlockSize)) {
P.printLine("which contains the block size of the file.");
P.formatLine("The current value is {0}.",
uint32_t(File.pdb().getMsfLayout().SB->BlockSize));
} else if (pdbBlockOffset() < endof(SuperBlock, FreeBlockMapBlock)) {
P.printLine("which contains the index of the FPM block (e.g. 1 or 2).");
P.formatLine("The current value is {0}.",
uint32_t(File.pdb().getMsfLayout().SB->FreeBlockMapBlock));
} else if (pdbBlockOffset() < endof(SuperBlock, NumBlocks)) {
P.printLine("which contains the number of blocks in the file.");
P.formatLine("The current value is {0}.",
uint32_t(File.pdb().getMsfLayout().SB->NumBlocks));
} else if (pdbBlockOffset() < endof(SuperBlock, NumDirectoryBytes)) {
P.printLine("which contains the number of bytes in the stream directory.");
P.formatLine("The current value is {0}.",
uint32_t(File.pdb().getMsfLayout().SB->NumDirectoryBytes));
} else if (pdbBlockOffset() < endof(SuperBlock, Unknown1)) {
P.printLine("whose purpose is unknown.");
P.formatLine("The current value is {0}.",
uint32_t(File.pdb().getMsfLayout().SB->Unknown1));
} else if (pdbBlockOffset() < endof(SuperBlock, BlockMapAddr)) {
P.printLine("which contains the file offset of the block map.");
P.formatLine("The current value is {0}.",
uint32_t(File.pdb().getMsfLayout().SB->BlockMapAddr));
} else {
assert(pdbBlockOffset() > sizeof(SuperBlock));
P.printLine(
"which is outside the range of valid data for the super block.");
}
}
static std::string toBinaryString(uint8_t Byte) {
char Result[9] = {0};
for (int I = 0; I < 8; ++I) {
char C = (Byte & 1) ? '1' : '0';
Result[I] = C;
Byte >>= 1;
}
return std::string(Result);
}
void ExplainOutputStyle::explainPdbFpmBlockOffset() {
const MSFLayout &Layout = File.pdb().getMsfLayout();
uint32_t MainFpm = Layout.mainFpmBlock();
uint32_t AltFpm = Layout.alternateFpmBlock();
assert(isPdbFpmBlock());
uint32_t Fpm = isPdbFpm1() ? 1 : 2;
uint32_t FpmChunk = pdbBlockIndex() / File.pdb().getBlockSize();
assert((Fpm == MainFpm) || (Fpm == AltFpm));
(void)AltFpm;
bool IsMain = (Fpm == MainFpm);
P.formatLine("Address is in FPM{0} ({1} FPM)", Fpm, IsMain ? "Main" : "Alt");
uint32_t DescribedBlockStart =
8 * (FpmChunk * File.pdb().getBlockSize() + pdbBlockOffset());
if (DescribedBlockStart > File.pdb().getBlockCount()) {
P.printLine("Address is in extraneous FPM space.");
return;
}
P.formatLine("Address describes the allocation status of blocks [{0},{1})",
DescribedBlockStart, DescribedBlockStart + 8);
ArrayRef<uint8_t> Bytes;
cantFail(File.pdb().getMsfBuffer().readBytes(FileOffset, 1, Bytes));
P.formatLine("Status = {0} (Note: 0 = allocated, 1 = free)",
toBinaryString(Bytes[0]));
}
void ExplainOutputStyle::explainPdbBlockMapOffset() {
uint64_t BlockMapOffset = File.pdb().getBlockMapOffset();
uint32_t OffsetInBlock = FileOffset - BlockMapOffset;
P.formatLine("Address is at offset {0} of the directory block list",
OffsetInBlock);
}
static uint32_t getOffsetInStream(ArrayRef<support::ulittle32_t> StreamBlocks,
uint64_t FileOffset, uint32_t BlockSize) {
uint32_t BlockIndex = FileOffset / BlockSize;
uint32_t OffsetInBlock = FileOffset - BlockIndex * BlockSize;
auto Iter = llvm::find(StreamBlocks, BlockIndex);
assert(Iter != StreamBlocks.end());
uint32_t StreamBlockIndex = std::distance(StreamBlocks.begin(), Iter);
return StreamBlockIndex * BlockSize + OffsetInBlock;
}
void ExplainOutputStyle::explainPdbStreamOffset(uint32_t Stream) {
SmallVector<StreamInfo, 12> Streams;
discoverStreamPurposes(File.pdb(), Streams);
assert(Stream <= Streams.size());
const StreamInfo &S = Streams[Stream];
const auto &Layout = File.pdb().getStreamLayout(Stream);
uint32_t StreamOff =
getOffsetInStream(Layout.Blocks, FileOffset, File.pdb().getBlockSize());
P.formatLine("Address is at offset {0}/{1} of Stream {2} ({3}){4}.",
StreamOff, Layout.Length, Stream, S.getLongName(),
(StreamOff > Layout.Length) ? " in unused space" : "");
switch (S.getPurpose()) {
case StreamPurpose::DBI: {
DbiStream &Dbi = cantFail(File.pdb().getPDBDbiStream());
explainStreamOffset(Dbi, StreamOff);
break;
}
case StreamPurpose::PDB: {
InfoStream &Info = cantFail(File.pdb().getPDBInfoStream());
explainStreamOffset(Info, StreamOff);
break;
}
case StreamPurpose::IPI:
case StreamPurpose::TPI:
case StreamPurpose::ModuleStream:
case StreamPurpose::NamedStream:
default:
break;
}
}
void ExplainOutputStyle::explainPdbStreamDirectoryOffset() {
auto DirectoryBlocks = File.pdb().getDirectoryBlockArray();
const auto &Layout = File.pdb().getMsfLayout();
uint32_t StreamOff =
getOffsetInStream(DirectoryBlocks, FileOffset, File.pdb().getBlockSize());
P.formatLine("Address is at offset {0}/{1} of Stream Directory{2}.",
StreamOff, uint32_t(Layout.SB->NumDirectoryBytes),
uint32_t(StreamOff > Layout.SB->NumDirectoryBytes)
? " in unused space"
: "");
}
void ExplainOutputStyle::explainPdbUnknownBlock() {
P.formatLine("Address has unknown purpose.");
}
template <typename T>
static void printStructField(LinePrinter &P, StringRef Label, T Value) {
P.formatLine("which contains {0}.", Label);
P.formatLine("The current value is {0}.", Value);
}
static void explainDbiHeaderOffset(LinePrinter &P, DbiStream &Dbi,
uint32_t Offset) {
const DbiStreamHeader *Header = Dbi.getHeader();
assert(Header != nullptr);
if (Offset < endof(DbiStreamHeader, VersionSignature))
printStructField(P, "the DBI Stream Version Signature",
int32_t(Header->VersionSignature));
else if (Offset < endof(DbiStreamHeader, VersionHeader))
printStructField(P, "the DBI Stream Version Header",
uint32_t(Header->VersionHeader));
else if (Offset < endof(DbiStreamHeader, Age))
printStructField(P, "the age of the DBI Stream", uint32_t(Header->Age));
else if (Offset < endof(DbiStreamHeader, GlobalSymbolStreamIndex))
printStructField(P, "the index of the Global Symbol Stream",
uint16_t(Header->GlobalSymbolStreamIndex));
else if (Offset < endof(DbiStreamHeader, BuildNumber))
printStructField(P, "the build number", uint16_t(Header->BuildNumber));
else if (Offset < endof(DbiStreamHeader, PublicSymbolStreamIndex))
printStructField(P, "the index of the Public Symbol Stream",
uint16_t(Header->PublicSymbolStreamIndex));
else if (Offset < endof(DbiStreamHeader, PdbDllVersion))
printStructField(P, "the version of mspdb.dll",
uint16_t(Header->PdbDllVersion));
else if (Offset < endof(DbiStreamHeader, SymRecordStreamIndex))
printStructField(P, "the index of the Symbol Record Stream",
uint16_t(Header->SymRecordStreamIndex));
else if (Offset < endof(DbiStreamHeader, PdbDllRbld))
printStructField(P, "the rbld of mspdb.dll", uint16_t(Header->PdbDllRbld));
else if (Offset < endof(DbiStreamHeader, ModiSubstreamSize))
printStructField(P, "the size of the Module Info Substream",
int32_t(Header->ModiSubstreamSize));
else if (Offset < endof(DbiStreamHeader, SecContrSubstreamSize))
printStructField(P, "the size of the Section Contribution Substream",
int32_t(Header->SecContrSubstreamSize));
else if (Offset < endof(DbiStreamHeader, SectionMapSize))
printStructField(P, "the size of the Section Map Substream",
int32_t(Header->SectionMapSize));
else if (Offset < endof(DbiStreamHeader, FileInfoSize))
printStructField(P, "the size of the File Info Substream",
int32_t(Header->FileInfoSize));
else if (Offset < endof(DbiStreamHeader, TypeServerSize))
printStructField(P, "the size of the Type Server Map",
int32_t(Header->TypeServerSize));
else if (Offset < endof(DbiStreamHeader, MFCTypeServerIndex))
printStructField(P, "the index of the MFC Type Server stream",
uint32_t(Header->MFCTypeServerIndex));
else if (Offset < endof(DbiStreamHeader, OptionalDbgHdrSize))
printStructField(P, "the size of the Optional Debug Stream array",
int32_t(Header->OptionalDbgHdrSize));
else if (Offset < endof(DbiStreamHeader, ECSubstreamSize))
printStructField(P, "the size of the Edit & Continue Substream",
int32_t(Header->ECSubstreamSize));
else if (Offset < endof(DbiStreamHeader, Flags))
printStructField(P, "the DBI Stream flags", uint16_t(Header->Flags));
else if (Offset < endof(DbiStreamHeader, MachineType))
printStructField(P, "the machine type", uint16_t(Header->MachineType));
else if (Offset < endof(DbiStreamHeader, Reserved))
printStructField(P, "reserved data", uint32_t(Header->Reserved));
}
static void explainDbiModiSubstreamOffset(LinePrinter &P, DbiStream &Dbi,
uint32_t Offset) {
VarStreamArray<DbiModuleDescriptor> ModuleDescriptors;
BinaryStreamRef ModiSubstreamData = Dbi.getModiSubstreamData().StreamData;
BinaryStreamReader Reader(ModiSubstreamData);
cantFail(Reader.readArray(ModuleDescriptors, ModiSubstreamData.getLength()));
auto Prev = ModuleDescriptors.begin();
assert(Prev.offset() == 0);
auto Current = Prev;
uint32_t Index = 0;
while (true) {
Prev = Current;
++Current;
if (Current == ModuleDescriptors.end() || Offset < Current.offset())
break;
++Index;
}
DbiModuleDescriptor &Descriptor = *Prev;
P.formatLine("which contains the descriptor for module {0} ({1}).", Index,
Descriptor.getModuleName());
}
template <typename T>
static void dontExplain(LinePrinter &Printer, T &Stream, uint32_t Offset) {}
template <typename T, typename SubstreamRangeT>
static void explainSubstreamOffset(LinePrinter &P, uint32_t OffsetInStream,
T &Stream,
const SubstreamRangeT &Substreams) {
uint32_t SubOffset = OffsetInStream;
for (const auto &Entry : Substreams) {
if (Entry.Size <= 0)
continue;
uint32_t S = static_cast<uint32_t>(Entry.Size);
if (SubOffset < S) {
P.formatLine("address is at offset {0}/{1} of the {2}.", SubOffset, S,
Entry.Label);
Entry.Explain(P, Stream, SubOffset);
return;
}
SubOffset -= S;
}
}
void ExplainOutputStyle::explainStreamOffset(DbiStream &Dbi,
uint32_t OffsetInStream) {
P.printLine("Within the DBI stream:");
AutoIndent Indent(P);
const DbiStreamHeader *Header = Dbi.getHeader();
assert(Header != nullptr);
struct SubstreamInfo {
int32_t Size;
StringRef Label;
void (*Explain)(LinePrinter &, DbiStream &, uint32_t);
} Substreams[] = {
{sizeof(DbiStreamHeader), "DBI Stream Header", explainDbiHeaderOffset},
{int32_t(Header->ModiSubstreamSize), "Module Info Substream",
explainDbiModiSubstreamOffset},
{int32_t(Header->SecContrSubstreamSize), "Section Contribution Substream",
dontExplain<DbiStream>},
{int32_t(Header->SectionMapSize), "Section Map", dontExplain<DbiStream>},
{int32_t(Header->FileInfoSize), "File Info Substream",
dontExplain<DbiStream>},
{int32_t(Header->TypeServerSize), "Type Server Map Substream",
dontExplain<DbiStream>},
{int32_t(Header->ECSubstreamSize), "Edit & Continue Substream",
dontExplain<DbiStream>},
{int32_t(Header->OptionalDbgHdrSize), "Optional Debug Stream Array",
dontExplain<DbiStream>},
};
explainSubstreamOffset(P, OffsetInStream, Dbi, Substreams);
}
static void explainPdbStreamHeaderOffset(LinePrinter &P, InfoStream &Info,
uint32_t Offset) {
const InfoStreamHeader *Header = Info.getHeader();
assert(Header != nullptr);
if (Offset < endof(InfoStreamHeader, Version))
printStructField(P, "the PDB Stream Version Signature",
uint32_t(Header->Version));
else if (Offset < endof(InfoStreamHeader, Signature))
printStructField(P, "the signature of the PDB Stream",
uint32_t(Header->Signature));
else if (Offset < endof(InfoStreamHeader, Age))
printStructField(P, "the age of the PDB", uint32_t(Header->Age));
else if (Offset < endof(InfoStreamHeader, Guid))
printStructField(P, "the guid of the PDB", fmt_guid(Header->Guid.Guid));
}
void ExplainOutputStyle::explainStreamOffset(InfoStream &Info,
uint32_t OffsetInStream) {
P.printLine("Within the PDB stream:");
AutoIndent Indent(P);
struct SubstreamInfo {
uint32_t Size;
StringRef Label;
void (*Explain)(LinePrinter &, InfoStream &, uint32_t);
} Substreams[] = {{sizeof(InfoStreamHeader), "PDB Stream Header",
explainPdbStreamHeaderOffset},
{Info.getNamedStreamMapByteSize(), "Named Stream Map",
dontExplain<InfoStream>},
{Info.getStreamSize(), "PDB Feature Signatures",
dontExplain<InfoStream>}};
explainSubstreamOffset(P, OffsetInStream, Info, Substreams);
}
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