469 lines
18 KiB
C++
469 lines
18 KiB
C++
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//===- ExplainOutputStyle.cpp --------------------------------- *- C++ --*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "ExplainOutputStyle.h"
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#include "FormatUtil.h"
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#include "InputFile.h"
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#include "StreamUtil.h"
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#include "llvm-pdbutil.h"
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#include "llvm/DebugInfo/CodeView/Formatters.h"
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#include "llvm/DebugInfo/MSF/MappedBlockStream.h"
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#include "llvm/DebugInfo/PDB/Native/DbiStream.h"
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#include "llvm/DebugInfo/PDB/Native/InfoStream.h"
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#include "llvm/DebugInfo/PDB/Native/PDBFile.h"
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#include "llvm/DebugInfo/PDB/Native/RawTypes.h"
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#include "llvm/Support/BinaryByteStream.h"
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#include "llvm/Support/BinaryStreamArray.h"
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#include "llvm/Support/Error.h"
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using namespace llvm;
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using namespace llvm::codeview;
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using namespace llvm::msf;
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using namespace llvm::pdb;
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ExplainOutputStyle::ExplainOutputStyle(InputFile &File, uint64_t FileOffset)
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: File(File), FileOffset(FileOffset), P(2, false, outs()) {}
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Error ExplainOutputStyle::dump() {
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P.formatLine("Explaining file offset {0} of file '{1}'.", FileOffset,
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File.getFilePath());
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if (File.isPdb())
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return explainPdbFile();
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return explainBinaryFile();
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}
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Error ExplainOutputStyle::explainPdbFile() {
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bool IsAllocated = explainPdbBlockStatus();
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if (!IsAllocated)
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return Error::success();
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AutoIndent Indent(P);
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if (isPdbSuperBlock())
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explainPdbSuperBlockOffset();
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else if (isPdbFpmBlock())
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explainPdbFpmBlockOffset();
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else if (isPdbBlockMapBlock())
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explainPdbBlockMapOffset();
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else if (isPdbStreamDirectoryBlock())
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explainPdbStreamDirectoryOffset();
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else if (auto Index = getPdbBlockStreamIndex())
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explainPdbStreamOffset(*Index);
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else
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explainPdbUnknownBlock();
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return Error::success();
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}
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Error ExplainOutputStyle::explainBinaryFile() {
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std::unique_ptr<BinaryByteStream> Stream =
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std::make_unique<BinaryByteStream>(File.unknown().getBuffer(),
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llvm::support::little);
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switch (opts::explain::InputType) {
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case opts::explain::InputFileType::DBIStream: {
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DbiStream Dbi(std::move(Stream));
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if (auto EC = Dbi.reload(nullptr))
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return EC;
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explainStreamOffset(Dbi, FileOffset);
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break;
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}
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case opts::explain::InputFileType::PDBStream: {
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InfoStream Info(std::move(Stream));
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if (auto EC = Info.reload())
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return EC;
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explainStreamOffset(Info, FileOffset);
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break;
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}
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default:
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llvm_unreachable("Invalid input file type!");
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}
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return Error::success();
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}
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uint32_t ExplainOutputStyle::pdbBlockIndex() const {
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return FileOffset / File.pdb().getBlockSize();
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}
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uint32_t ExplainOutputStyle::pdbBlockOffset() const {
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uint64_t BlockStart = pdbBlockIndex() * File.pdb().getBlockSize();
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assert(FileOffset >= BlockStart);
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return FileOffset - BlockStart;
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}
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bool ExplainOutputStyle::isPdbSuperBlock() const {
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return pdbBlockIndex() == 0;
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}
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bool ExplainOutputStyle::isPdbFpm1() const {
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return ((pdbBlockIndex() - 1) % File.pdb().getBlockSize() == 0);
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}
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bool ExplainOutputStyle::isPdbFpm2() const {
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return ((pdbBlockIndex() - 2) % File.pdb().getBlockSize() == 0);
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}
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bool ExplainOutputStyle::isPdbFpmBlock() const {
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return isPdbFpm1() || isPdbFpm2();
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}
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bool ExplainOutputStyle::isPdbBlockMapBlock() const {
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return pdbBlockIndex() == File.pdb().getBlockMapIndex();
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}
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bool ExplainOutputStyle::isPdbStreamDirectoryBlock() const {
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const auto &Layout = File.pdb().getMsfLayout();
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return llvm::is_contained(Layout.DirectoryBlocks, pdbBlockIndex());
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}
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Optional<uint32_t> ExplainOutputStyle::getPdbBlockStreamIndex() const {
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const auto &Layout = File.pdb().getMsfLayout();
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for (const auto &Entry : enumerate(Layout.StreamMap)) {
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if (!llvm::is_contained(Entry.value(), pdbBlockIndex()))
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continue;
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return Entry.index();
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}
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return None;
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}
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bool ExplainOutputStyle::explainPdbBlockStatus() {
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if (FileOffset >= File.pdb().getFileSize()) {
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P.formatLine("Address {0} is not in the file (file size = {1}).",
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FileOffset, File.pdb().getFileSize());
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return false;
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}
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P.formatLine("Block:Offset = {2:X-}:{1:X-4}.", FileOffset, pdbBlockOffset(),
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pdbBlockIndex());
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bool IsFree = File.pdb().getMsfLayout().FreePageMap[pdbBlockIndex()];
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P.formatLine("Address is in block {0} ({1}allocated).", pdbBlockIndex(),
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IsFree ? "un" : "");
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return !IsFree;
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}
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#define endof(Class, Field) (offsetof(Class, Field) + sizeof(Class::Field))
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void ExplainOutputStyle::explainPdbSuperBlockOffset() {
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P.formatLine("This corresponds to offset {0} of the MSF super block, ",
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pdbBlockOffset());
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if (pdbBlockOffset() < endof(SuperBlock, MagicBytes))
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P.printLine("which is part of the MSF file magic.");
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else if (pdbBlockOffset() < endof(SuperBlock, BlockSize)) {
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P.printLine("which contains the block size of the file.");
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P.formatLine("The current value is {0}.",
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uint32_t(File.pdb().getMsfLayout().SB->BlockSize));
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} else if (pdbBlockOffset() < endof(SuperBlock, FreeBlockMapBlock)) {
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P.printLine("which contains the index of the FPM block (e.g. 1 or 2).");
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P.formatLine("The current value is {0}.",
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uint32_t(File.pdb().getMsfLayout().SB->FreeBlockMapBlock));
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} else if (pdbBlockOffset() < endof(SuperBlock, NumBlocks)) {
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P.printLine("which contains the number of blocks in the file.");
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P.formatLine("The current value is {0}.",
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uint32_t(File.pdb().getMsfLayout().SB->NumBlocks));
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} else if (pdbBlockOffset() < endof(SuperBlock, NumDirectoryBytes)) {
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P.printLine("which contains the number of bytes in the stream directory.");
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P.formatLine("The current value is {0}.",
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uint32_t(File.pdb().getMsfLayout().SB->NumDirectoryBytes));
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} else if (pdbBlockOffset() < endof(SuperBlock, Unknown1)) {
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P.printLine("whose purpose is unknown.");
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P.formatLine("The current value is {0}.",
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uint32_t(File.pdb().getMsfLayout().SB->Unknown1));
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} else if (pdbBlockOffset() < endof(SuperBlock, BlockMapAddr)) {
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P.printLine("which contains the file offset of the block map.");
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P.formatLine("The current value is {0}.",
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uint32_t(File.pdb().getMsfLayout().SB->BlockMapAddr));
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} else {
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assert(pdbBlockOffset() > sizeof(SuperBlock));
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P.printLine(
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"which is outside the range of valid data for the super block.");
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}
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}
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static std::string toBinaryString(uint8_t Byte) {
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char Result[9] = {0};
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for (int I = 0; I < 8; ++I) {
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char C = (Byte & 1) ? '1' : '0';
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Result[I] = C;
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Byte >>= 1;
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}
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return std::string(Result);
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}
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void ExplainOutputStyle::explainPdbFpmBlockOffset() {
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const MSFLayout &Layout = File.pdb().getMsfLayout();
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uint32_t MainFpm = Layout.mainFpmBlock();
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uint32_t AltFpm = Layout.alternateFpmBlock();
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assert(isPdbFpmBlock());
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uint32_t Fpm = isPdbFpm1() ? 1 : 2;
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uint32_t FpmChunk = pdbBlockIndex() / File.pdb().getBlockSize();
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assert((Fpm == MainFpm) || (Fpm == AltFpm));
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(void)AltFpm;
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bool IsMain = (Fpm == MainFpm);
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P.formatLine("Address is in FPM{0} ({1} FPM)", Fpm, IsMain ? "Main" : "Alt");
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uint32_t DescribedBlockStart =
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8 * (FpmChunk * File.pdb().getBlockSize() + pdbBlockOffset());
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if (DescribedBlockStart > File.pdb().getBlockCount()) {
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P.printLine("Address is in extraneous FPM space.");
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return;
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}
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P.formatLine("Address describes the allocation status of blocks [{0},{1})",
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DescribedBlockStart, DescribedBlockStart + 8);
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ArrayRef<uint8_t> Bytes;
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cantFail(File.pdb().getMsfBuffer().readBytes(FileOffset, 1, Bytes));
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P.formatLine("Status = {0} (Note: 0 = allocated, 1 = free)",
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toBinaryString(Bytes[0]));
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}
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void ExplainOutputStyle::explainPdbBlockMapOffset() {
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uint64_t BlockMapOffset = File.pdb().getBlockMapOffset();
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uint32_t OffsetInBlock = FileOffset - BlockMapOffset;
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P.formatLine("Address is at offset {0} of the directory block list",
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OffsetInBlock);
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}
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static uint32_t getOffsetInStream(ArrayRef<support::ulittle32_t> StreamBlocks,
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uint64_t FileOffset, uint32_t BlockSize) {
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uint32_t BlockIndex = FileOffset / BlockSize;
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uint32_t OffsetInBlock = FileOffset - BlockIndex * BlockSize;
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auto Iter = llvm::find(StreamBlocks, BlockIndex);
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assert(Iter != StreamBlocks.end());
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uint32_t StreamBlockIndex = std::distance(StreamBlocks.begin(), Iter);
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return StreamBlockIndex * BlockSize + OffsetInBlock;
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}
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void ExplainOutputStyle::explainPdbStreamOffset(uint32_t Stream) {
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SmallVector<StreamInfo, 12> Streams;
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discoverStreamPurposes(File.pdb(), Streams);
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assert(Stream <= Streams.size());
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const StreamInfo &S = Streams[Stream];
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const auto &Layout = File.pdb().getStreamLayout(Stream);
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uint32_t StreamOff =
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getOffsetInStream(Layout.Blocks, FileOffset, File.pdb().getBlockSize());
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P.formatLine("Address is at offset {0}/{1} of Stream {2} ({3}){4}.",
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StreamOff, Layout.Length, Stream, S.getLongName(),
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(StreamOff > Layout.Length) ? " in unused space" : "");
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switch (S.getPurpose()) {
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case StreamPurpose::DBI: {
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DbiStream &Dbi = cantFail(File.pdb().getPDBDbiStream());
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explainStreamOffset(Dbi, StreamOff);
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break;
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}
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case StreamPurpose::PDB: {
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InfoStream &Info = cantFail(File.pdb().getPDBInfoStream());
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explainStreamOffset(Info, StreamOff);
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break;
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}
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case StreamPurpose::IPI:
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case StreamPurpose::TPI:
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case StreamPurpose::ModuleStream:
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case StreamPurpose::NamedStream:
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default:
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break;
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}
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}
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void ExplainOutputStyle::explainPdbStreamDirectoryOffset() {
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auto DirectoryBlocks = File.pdb().getDirectoryBlockArray();
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const auto &Layout = File.pdb().getMsfLayout();
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uint32_t StreamOff =
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getOffsetInStream(DirectoryBlocks, FileOffset, File.pdb().getBlockSize());
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P.formatLine("Address is at offset {0}/{1} of Stream Directory{2}.",
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StreamOff, uint32_t(Layout.SB->NumDirectoryBytes),
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uint32_t(StreamOff > Layout.SB->NumDirectoryBytes)
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? " in unused space"
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: "");
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}
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void ExplainOutputStyle::explainPdbUnknownBlock() {
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P.formatLine("Address has unknown purpose.");
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}
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template <typename T>
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static void printStructField(LinePrinter &P, StringRef Label, T Value) {
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P.formatLine("which contains {0}.", Label);
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P.formatLine("The current value is {0}.", Value);
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}
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static void explainDbiHeaderOffset(LinePrinter &P, DbiStream &Dbi,
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uint32_t Offset) {
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const DbiStreamHeader *Header = Dbi.getHeader();
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assert(Header != nullptr);
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if (Offset < endof(DbiStreamHeader, VersionSignature))
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printStructField(P, "the DBI Stream Version Signature",
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int32_t(Header->VersionSignature));
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else if (Offset < endof(DbiStreamHeader, VersionHeader))
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printStructField(P, "the DBI Stream Version Header",
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uint32_t(Header->VersionHeader));
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else if (Offset < endof(DbiStreamHeader, Age))
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printStructField(P, "the age of the DBI Stream", uint32_t(Header->Age));
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else if (Offset < endof(DbiStreamHeader, GlobalSymbolStreamIndex))
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printStructField(P, "the index of the Global Symbol Stream",
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uint16_t(Header->GlobalSymbolStreamIndex));
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else if (Offset < endof(DbiStreamHeader, BuildNumber))
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printStructField(P, "the build number", uint16_t(Header->BuildNumber));
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else if (Offset < endof(DbiStreamHeader, PublicSymbolStreamIndex))
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printStructField(P, "the index of the Public Symbol Stream",
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uint16_t(Header->PublicSymbolStreamIndex));
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else if (Offset < endof(DbiStreamHeader, PdbDllVersion))
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printStructField(P, "the version of mspdb.dll",
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uint16_t(Header->PdbDllVersion));
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else if (Offset < endof(DbiStreamHeader, SymRecordStreamIndex))
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printStructField(P, "the index of the Symbol Record Stream",
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uint16_t(Header->SymRecordStreamIndex));
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else if (Offset < endof(DbiStreamHeader, PdbDllRbld))
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printStructField(P, "the rbld of mspdb.dll", uint16_t(Header->PdbDllRbld));
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else if (Offset < endof(DbiStreamHeader, ModiSubstreamSize))
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printStructField(P, "the size of the Module Info Substream",
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int32_t(Header->ModiSubstreamSize));
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else if (Offset < endof(DbiStreamHeader, SecContrSubstreamSize))
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printStructField(P, "the size of the Section Contribution Substream",
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int32_t(Header->SecContrSubstreamSize));
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else if (Offset < endof(DbiStreamHeader, SectionMapSize))
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printStructField(P, "the size of the Section Map Substream",
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int32_t(Header->SectionMapSize));
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else if (Offset < endof(DbiStreamHeader, FileInfoSize))
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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);
|
||
|
|
}
|