llvm/tools/llvm-pdbutil/llvm-pdbutil.cpp

//===- llvm-pdbutil.cpp - Dump debug info from a PDB file -------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Dumps debug information present in PDB files.
//
//===----------------------------------------------------------------------===//

#include "llvm-pdbutil.h"

#include "Analyze.h"
#include "BytesOutputStyle.h"
#include "Diff.h"
#include "DumpOutputStyle.h"
#include "LinePrinter.h"
#include "OutputStyle.h"
#include "PrettyCompilandDumper.h"
#include "PrettyExternalSymbolDumper.h"
#include "PrettyFunctionDumper.h"
#include "PrettyTypeDumper.h"
#include "PrettyVariableDumper.h"
#include "YAMLOutputStyle.h"

#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Config/config.h"
#include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
#include "llvm/DebugInfo/CodeView/DebugInlineeLinesSubsection.h"
#include "llvm/DebugInfo/CodeView/DebugLinesSubsection.h"
#include "llvm/DebugInfo/CodeView/LazyRandomTypeCollection.h"
#include "llvm/DebugInfo/CodeView/StringsAndChecksums.h"
#include "llvm/DebugInfo/CodeView/TypeStreamMerger.h"
#include "llvm/DebugInfo/CodeView/TypeTableBuilder.h"
#include "llvm/DebugInfo/MSF/MSFBuilder.h"
#include "llvm/DebugInfo/PDB/GenericError.h"
#include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
#include "llvm/DebugInfo/PDB/IPDBRawSymbol.h"
#include "llvm/DebugInfo/PDB/IPDBSession.h"
#include "llvm/DebugInfo/PDB/Native/DbiModuleDescriptorBuilder.h"
#include "llvm/DebugInfo/PDB/Native/DbiStream.h"
#include "llvm/DebugInfo/PDB/Native/DbiStreamBuilder.h"
#include "llvm/DebugInfo/PDB/Native/InfoStream.h"
#include "llvm/DebugInfo/PDB/Native/InfoStreamBuilder.h"
#include "llvm/DebugInfo/PDB/Native/NativeSession.h"
#include "llvm/DebugInfo/PDB/Native/PDBFile.h"
#include "llvm/DebugInfo/PDB/Native/PDBFileBuilder.h"
#include "llvm/DebugInfo/PDB/Native/PDBStringTableBuilder.h"
#include "llvm/DebugInfo/PDB/Native/RawConstants.h"
#include "llvm/DebugInfo/PDB/Native/RawError.h"
#include "llvm/DebugInfo/PDB/Native/TpiStream.h"
#include "llvm/DebugInfo/PDB/Native/TpiStreamBuilder.h"
#include "llvm/DebugInfo/PDB/PDB.h"
#include "llvm/DebugInfo/PDB/PDBSymbolCompiland.h"
#include "llvm/DebugInfo/PDB/PDBSymbolData.h"
#include "llvm/DebugInfo/PDB/PDBSymbolExe.h"
#include "llvm/DebugInfo/PDB/PDBSymbolFunc.h"
#include "llvm/DebugInfo/PDB/PDBSymbolThunk.h"
#include "llvm/Support/BinaryByteStream.h"
#include "llvm/Support/COM.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/FileOutputBuffer.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Regex.h"
#include "llvm/Support/ScopedPrinter.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/raw_ostream.h"

using namespace llvm;
using namespace llvm::codeview;
using namespace llvm::msf;
using namespace llvm::pdb;

namespace opts {

cl::SubCommand DumpSubcommand("dump", "Dump MSF and CodeView debug info");
cl::SubCommand BytesSubcommand("bytes", "Dump raw bytes from the PDB file");

cl::SubCommand
    PrettySubcommand("pretty",
                     "Dump semantic information about types and symbols");

cl::SubCommand DiffSubcommand("diff", "Diff the contents of 2 PDB files");

cl::SubCommand
    YamlToPdbSubcommand("yaml2pdb",
                        "Generate a PDB file from a YAML description");
cl::SubCommand
    PdbToYamlSubcommand("pdb2yaml",
                        "Generate a detailed YAML description of a PDB File");

cl::SubCommand
    AnalyzeSubcommand("analyze",
                      "Analyze various aspects of a PDB's structure");

cl::SubCommand MergeSubcommand("merge",
                               "Merge multiple PDBs into a single PDB");

cl::OptionCategory TypeCategory("Symbol Type Options");
cl::OptionCategory FilterCategory("Filtering and Sorting Options");
cl::OptionCategory OtherOptions("Other Options");

namespace pretty {
cl::list<std::string> InputFilenames(cl::Positional,
                                     cl::desc("<input PDB files>"),
                                     cl::OneOrMore, cl::sub(PrettySubcommand));

cl::opt<bool> Compilands("compilands", cl::desc("Display compilands"),
                         cl::cat(TypeCategory), cl::sub(PrettySubcommand));
cl::opt<bool> Symbols("module-syms",
                      cl::desc("Display symbols for each compiland"),
                      cl::cat(TypeCategory), cl::sub(PrettySubcommand));
cl::opt<bool> Globals("globals", cl::desc("Dump global symbols"),
                      cl::cat(TypeCategory), cl::sub(PrettySubcommand));
cl::opt<bool> Externals("externals", cl::desc("Dump external symbols"),
                        cl::cat(TypeCategory), cl::sub(PrettySubcommand));
cl::list<SymLevel> SymTypes(
    "sym-types", cl::desc("Type of symbols to dump (default all)"),
    cl::cat(TypeCategory), cl::sub(PrettySubcommand), cl::ZeroOrMore,
    cl::values(
        clEnumValN(SymLevel::Thunks, "thunks", "Display thunk symbols"),
        clEnumValN(SymLevel::Data, "data", "Display data symbols"),
        clEnumValN(SymLevel::Functions, "funcs", "Display function symbols"),
        clEnumValN(SymLevel::All, "all", "Display all symbols (default)")));

cl::opt<bool>
    Types("types",
          cl::desc("Display all types (implies -classes, -enums, -typedefs)"),
          cl::cat(TypeCategory), cl::sub(PrettySubcommand));
cl::opt<bool> Classes("classes", cl::desc("Display class types"),
                      cl::cat(TypeCategory), cl::sub(PrettySubcommand));
cl::opt<bool> Enums("enums", cl::desc("Display enum types"),
                    cl::cat(TypeCategory), cl::sub(PrettySubcommand));
cl::opt<bool> Typedefs("typedefs", cl::desc("Display typedef types"),
                       cl::cat(TypeCategory), cl::sub(PrettySubcommand));
cl::opt<SymbolSortMode> SymbolOrder(
    "symbol-order", cl::desc("symbol sort order"),
    cl::init(SymbolSortMode::None),
    cl::values(clEnumValN(SymbolSortMode::None, "none",
                          "Undefined / no particular sort order"),
               clEnumValN(SymbolSortMode::Name, "name", "Sort symbols by name"),
               clEnumValN(SymbolSortMode::Size, "size",
                          "Sort symbols by size")),
    cl::cat(TypeCategory), cl::sub(PrettySubcommand));

cl::opt<ClassSortMode> ClassOrder(
    "class-order", cl::desc("Class sort order"), cl::init(ClassSortMode::None),
    cl::values(
        clEnumValN(ClassSortMode::None, "none",
                   "Undefined / no particular sort order"),
        clEnumValN(ClassSortMode::Name, "name", "Sort classes by name"),
        clEnumValN(ClassSortMode::Size, "size", "Sort classes by size"),
        clEnumValN(ClassSortMode::Padding, "padding",
                   "Sort classes by amount of padding"),
        clEnumValN(ClassSortMode::PaddingPct, "padding-pct",
                   "Sort classes by percentage of space consumed by padding"),
        clEnumValN(ClassSortMode::PaddingImmediate, "padding-imm",
                   "Sort classes by amount of immediate padding"),
        clEnumValN(ClassSortMode::PaddingPctImmediate, "padding-pct-imm",
                   "Sort classes by percentage of space consumed by immediate "
                   "padding")),
    cl::cat(TypeCategory), cl::sub(PrettySubcommand));

cl::opt<ClassDefinitionFormat> ClassFormat(
    "class-definitions", cl::desc("Class definition format"),
    cl::init(ClassDefinitionFormat::All),
    cl::values(
        clEnumValN(ClassDefinitionFormat::All, "all",
                   "Display all class members including data, constants, "
                   "typedefs, functions, etc"),
        clEnumValN(ClassDefinitionFormat::Layout, "layout",
                   "Only display members that contribute to class size."),
        clEnumValN(ClassDefinitionFormat::None, "none",
                   "Don't display class definitions")),
    cl::cat(TypeCategory), cl::sub(PrettySubcommand));
cl::opt<uint32_t> ClassRecursionDepth(
    "class-recurse-depth", cl::desc("Class recursion depth (0=no limit)"),
    cl::init(0), cl::cat(TypeCategory), cl::sub(PrettySubcommand));

cl::opt<bool> Lines("lines", cl::desc("Line tables"), cl::cat(TypeCategory),
                    cl::sub(PrettySubcommand));
cl::opt<bool>
    All("all", cl::desc("Implies all other options in 'Symbol Types' category"),
        cl::cat(TypeCategory), cl::sub(PrettySubcommand));

cl::opt<uint64_t> LoadAddress(
    "load-address",
    cl::desc("Assume the module is loaded at the specified address"),
    cl::cat(OtherOptions), cl::sub(PrettySubcommand));
cl::opt<bool> Native("native", cl::desc("Use native PDB reader instead of DIA"),
                     cl::cat(OtherOptions), cl::sub(PrettySubcommand));
cl::opt<cl::boolOrDefault>
    ColorOutput("color-output",
                cl::desc("Override use of color (default = isatty)"),
                cl::cat(OtherOptions), cl::sub(PrettySubcommand));
cl::list<std::string> ExcludeTypes(
    "exclude-types", cl::desc("Exclude types by regular expression"),
    cl::ZeroOrMore, cl::cat(FilterCategory), cl::sub(PrettySubcommand));
cl::list<std::string> ExcludeSymbols(
    "exclude-symbols", cl::desc("Exclude symbols by regular expression"),
    cl::ZeroOrMore, cl::cat(FilterCategory), cl::sub(PrettySubcommand));
cl::list<std::string> ExcludeCompilands(
    "exclude-compilands", cl::desc("Exclude compilands by regular expression"),
    cl::ZeroOrMore, cl::cat(FilterCategory), cl::sub(PrettySubcommand));

cl::list<std::string> IncludeTypes(
    "include-types",
    cl::desc("Include only types which match a regular expression"),
    cl::ZeroOrMore, cl::cat(FilterCategory), cl::sub(PrettySubcommand));
cl::list<std::string> IncludeSymbols(
    "include-symbols",
    cl::desc("Include only symbols which match a regular expression"),
    cl::ZeroOrMore, cl::cat(FilterCategory), cl::sub(PrettySubcommand));
cl::list<std::string> IncludeCompilands(
    "include-compilands",
    cl::desc("Include only compilands those which match a regular expression"),
    cl::ZeroOrMore, cl::cat(FilterCategory), cl::sub(PrettySubcommand));
cl::opt<uint32_t> SizeThreshold(
    "min-type-size", cl::desc("Displays only those types which are greater "
                              "than or equal to the specified size."),
    cl::init(0), cl::cat(FilterCategory), cl::sub(PrettySubcommand));
cl::opt<uint32_t> PaddingThreshold(
    "min-class-padding", cl::desc("Displays only those classes which have at "
                                  "least the specified amount of padding."),
    cl::init(0), cl::cat(FilterCategory), cl::sub(PrettySubcommand));
cl::opt<uint32_t> ImmediatePaddingThreshold(
    "min-class-padding-imm",
    cl::desc("Displays only those classes which have at least the specified "
             "amount of immediate padding, ignoring padding internal to bases "
             "and aggregates."),
    cl::init(0), cl::cat(FilterCategory), cl::sub(PrettySubcommand));

cl::opt<bool> ExcludeCompilerGenerated(
    "no-compiler-generated",
    cl::desc("Don't show compiler generated types and symbols"),
    cl::cat(FilterCategory), cl::sub(PrettySubcommand));
cl::opt<bool>
    ExcludeSystemLibraries("no-system-libs",
                           cl::desc("Don't show symbols from system libraries"),
                           cl::cat(FilterCategory), cl::sub(PrettySubcommand));

cl::opt<bool> NoEnumDefs("no-enum-definitions",
                         cl::desc("Don't display full enum definitions"),
                         cl::cat(FilterCategory), cl::sub(PrettySubcommand));
}

namespace diff {
cl::list<std::string> InputFilenames(cl::Positional,
                                     cl::desc("<first> <second>"),
                                     cl::OneOrMore, cl::sub(DiffSubcommand));
}

cl::OptionCategory FileOptions("Module & File Options");

namespace bytes {
llvm::Optional<NumberRange> DumpBlockRange;
llvm::Optional<NumberRange> DumpByteRange;

cl::opt<std::string> DumpBlockRangeOpt(
    "block-range", cl::value_desc("start[-end]"),
    cl::desc("Dump binary data from specified range of blocks."),
    cl::sub(BytesSubcommand));

cl::opt<std::string>
    DumpByteRangeOpt("byte-range", cl::value_desc("start[-end]"),
                     cl::desc("Dump binary data from specified range of bytes"),
                     cl::sub(BytesSubcommand));

cl::list<std::string>
    DumpStreamData("stream-data", cl::CommaSeparated, cl::ZeroOrMore,
                   cl::desc("Dump binary data from specified streams.  Format "
                            "is SN[:Start][@Size]"),
                   cl::sub(BytesSubcommand));

cl::opt<bool> NameMap("name-map", cl::desc("Dump bytes of PDB Name Map"),
                      cl::sub(BytesSubcommand));

cl::list<std::string> InputFilenames(cl::Positional,
                                     cl::desc("<input PDB files>"),
                                     cl::OneOrMore, cl::sub(BytesSubcommand));

} // namespace bytes

namespace dump {

cl::OptionCategory MsfOptions("MSF Container Options");
cl::OptionCategory TypeOptions("Type Record Options");
cl::OptionCategory SymbolOptions("Symbol Options");
cl::OptionCategory MiscOptions("Miscellaneous Options");

// MSF OPTIONS
cl::opt<bool> DumpSummary("summary", cl::desc("dump file summary"),
                          cl::cat(MsfOptions), cl::sub(DumpSubcommand));
cl::opt<bool> DumpStreams("streams",
                          cl::desc("dump summary of the PDB streams"),
                          cl::cat(MsfOptions), cl::sub(DumpSubcommand));
cl::opt<bool> DumpStreamBlocks(
    "stream-blocks",
    cl::desc("Add block information to the output of -streams"),
    cl::cat(MsfOptions), cl::sub(DumpSubcommand));

// TYPE OPTIONS
cl::opt<bool> DumpTypes("types",
                        cl::desc("dump CodeView type records from TPI stream"),
                        cl::cat(TypeOptions), cl::sub(DumpSubcommand));
cl::opt<bool> DumpTypeData(
    "type-data",
    cl::desc("dump CodeView type record raw bytes from TPI stream"),
    cl::cat(TypeOptions), cl::sub(DumpSubcommand));

cl::opt<bool> DumpTypeExtras("type-extras",
                             cl::desc("dump type hashes and index offsets"),
                             cl::cat(TypeOptions), cl::sub(DumpSubcommand));

cl::list<uint32_t> DumpTypeIndex(
    "type-index", cl::ZeroOrMore,
    cl::desc("only dump types with the specified hexadecimal type index"),
    cl::cat(TypeOptions), cl::sub(DumpSubcommand));

cl::opt<bool> DumpIds("ids",
                      cl::desc("dump CodeView type records from IPI stream"),
                      cl::cat(TypeOptions), cl::sub(DumpSubcommand));
cl::opt<bool>
    DumpIdData("id-data",
               cl::desc("dump CodeView type record raw bytes from IPI stream"),
               cl::cat(TypeOptions), cl::sub(DumpSubcommand));

cl::opt<bool> DumpIdExtras("id-extras",
                           cl::desc("dump id hashes and index offsets"),
                           cl::cat(TypeOptions), cl::sub(DumpSubcommand));
cl::list<uint32_t> DumpIdIndex(
    "id-index", cl::ZeroOrMore,
    cl::desc("only dump ids with the specified hexadecimal type index"),
    cl::cat(TypeOptions), cl::sub(DumpSubcommand));

// SYMBOL OPTIONS
cl::opt<bool> DumpPublics("publics", cl::desc("dump Publics stream data"),
                          cl::cat(SymbolOptions), cl::sub(DumpSubcommand));
cl::opt<bool> DumpSymbols("symbols", cl::desc("dump module symbols"),
                          cl::cat(SymbolOptions), cl::sub(DumpSubcommand));

cl::opt<bool>
    DumpSymRecordBytes("sym-data",
                       cl::desc("dump CodeView symbol record raw bytes"),
                       cl::cat(SymbolOptions), cl::sub(DumpSubcommand));

// MODULE & FILE OPTIONS
cl::opt<bool> DumpModules("modules", cl::desc("dump compiland information"),
                          cl::cat(FileOptions), cl::sub(DumpSubcommand));
cl::opt<bool> DumpModuleFiles(
    "files",
    cl::desc("Dump the source files that contribute to each module's."),
    cl::cat(FileOptions), cl::sub(DumpSubcommand));
cl::opt<bool> DumpLines(
    "l",
    cl::desc("dump source file/line information (DEBUG_S_LINES subsection)"),
    cl::cat(FileOptions), cl::sub(DumpSubcommand));
cl::opt<bool> DumpInlineeLines(
    "il",
    cl::desc("dump inlinee line information (DEBUG_S_INLINEELINES subsection)"),
    cl::cat(FileOptions), cl::sub(DumpSubcommand));
cl::opt<bool> DumpXmi(
    "xmi",
    cl::desc(
        "dump cross module imports (DEBUG_S_CROSSSCOPEIMPORTS subsection)"),
    cl::cat(FileOptions), cl::sub(DumpSubcommand));
cl::opt<bool> DumpXme(
    "xme",
    cl::desc(
        "dump cross module exports (DEBUG_S_CROSSSCOPEEXPORTS subsection)"),
    cl::cat(FileOptions), cl::sub(DumpSubcommand));

// MISCELLANEOUS OPTIONS
cl::opt<bool> DumpStringTable("string-table", cl::desc("dump PDB String Table"),
                              cl::cat(MiscOptions), cl::sub(DumpSubcommand));

cl::opt<bool> DumpSectionContribs("section-contribs",
                                  cl::desc("dump section contributions"),
                                  cl::cat(MiscOptions),
                                  cl::sub(DumpSubcommand));
cl::opt<bool> DumpSectionMap("section-map", cl::desc("dump section map"),
                             cl::cat(MiscOptions), cl::sub(DumpSubcommand));

cl::opt<bool> RawAll("all", cl::desc("Implies most other options."),
                     cl::cat(MiscOptions), cl::sub(DumpSubcommand));

cl::list<std::string> InputFilenames(cl::Positional,
                                     cl::desc("<input PDB files>"),
                                     cl::OneOrMore, cl::sub(DumpSubcommand));
}

namespace yaml2pdb {
cl::opt<std::string>
    YamlPdbOutputFile("pdb", cl::desc("the name of the PDB file to write"),
                      cl::sub(YamlToPdbSubcommand));

cl::opt<std::string> InputFilename(cl::Positional,
                                   cl::desc("<input YAML file>"), cl::Required,
                                   cl::sub(YamlToPdbSubcommand));
}

namespace pdb2yaml {
cl::opt<bool> All("all",
                  cl::desc("Dump everything we know how to dump."),
                  cl::sub(PdbToYamlSubcommand), cl::init(false));
cl::opt<bool> NoFileHeaders("no-file-headers",
                            cl::desc("Do not dump MSF file headers"),
                            cl::sub(PdbToYamlSubcommand), cl::init(false));
cl::opt<bool> Minimal("minimal",
                      cl::desc("Don't write fields with default values"),
                      cl::sub(PdbToYamlSubcommand), cl::init(false));

cl::opt<bool> StreamMetadata(
    "stream-metadata",
    cl::desc("Dump the number of streams and each stream's size"),
    cl::sub(PdbToYamlSubcommand), cl::init(false));
cl::opt<bool> StreamDirectory(
    "stream-directory",
    cl::desc("Dump each stream's block map (implies -stream-metadata)"),
    cl::sub(PdbToYamlSubcommand), cl::init(false));
cl::opt<bool> PdbStream("pdb-stream",
                        cl::desc("Dump the PDB Stream (Stream 1)"),
                        cl::sub(PdbToYamlSubcommand), cl::init(false));

cl::opt<bool> StringTable("string-table", cl::desc("Dump the PDB String Table"),
                          cl::sub(PdbToYamlSubcommand), cl::init(false));

cl::opt<bool> DbiStream("dbi-stream",
                        cl::desc("Dump the DBI Stream Headers (Stream 2)"),
                        cl::sub(PdbToYamlSubcommand), cl::init(false));

cl::opt<bool> TpiStream("tpi-stream",
                        cl::desc("Dump the TPI Stream (Stream 3)"),
                        cl::sub(PdbToYamlSubcommand), cl::init(false));

cl::opt<bool> IpiStream("ipi-stream",
                        cl::desc("Dump the IPI Stream (Stream 5)"),
                        cl::sub(PdbToYamlSubcommand), cl::init(false));

// MODULE & FILE OPTIONS
cl::opt<bool> DumpModules("modules", cl::desc("dump compiland information"),
                          cl::cat(FileOptions), cl::sub(PdbToYamlSubcommand));
cl::opt<bool> DumpModuleFiles("module-files", cl::desc("dump file information"),
                              cl::cat(FileOptions),
                              cl::sub(PdbToYamlSubcommand));
cl::list<ModuleSubsection> DumpModuleSubsections(
    "subsections", cl::ZeroOrMore, cl::CommaSeparated,
    cl::desc("dump subsections from each module's debug stream"),
    cl::values(
        clEnumValN(
            ModuleSubsection::CrossScopeExports, "cme",
            "Cross module exports (DEBUG_S_CROSSSCOPEEXPORTS subsection)"),
        clEnumValN(
            ModuleSubsection::CrossScopeImports, "cmi",
            "Cross module imports (DEBUG_S_CROSSSCOPEIMPORTS subsection)"),
        clEnumValN(ModuleSubsection::FileChecksums, "fc",
                   "File checksums (DEBUG_S_CHECKSUMS subsection)"),
        clEnumValN(ModuleSubsection::InlineeLines, "ilines",
                   "Inlinee lines (DEBUG_S_INLINEELINES subsection)"),
        clEnumValN(ModuleSubsection::Lines, "lines",
                   "Lines (DEBUG_S_LINES subsection)"),
        clEnumValN(ModuleSubsection::StringTable, "strings",
                   "String Table (DEBUG_S_STRINGTABLE subsection) (not "
                   "typically present in PDB file)"),
        clEnumValN(ModuleSubsection::FrameData, "frames",
                   "Frame Data (DEBUG_S_FRAMEDATA subsection)"),
        clEnumValN(ModuleSubsection::Symbols, "symbols",
                   "Symbols (DEBUG_S_SYMBOLS subsection) (not typically "
                   "present in PDB file)"),
        clEnumValN(ModuleSubsection::CoffSymbolRVAs, "rvas",
                   "COFF Symbol RVAs (DEBUG_S_COFF_SYMBOL_RVA subsection)"),
        clEnumValN(ModuleSubsection::Unknown, "unknown",
                   "Any subsection not covered by another option"),
        clEnumValN(ModuleSubsection::All, "all", "All known subsections")),
    cl::cat(FileOptions), cl::sub(PdbToYamlSubcommand));
cl::opt<bool> DumpModuleSyms("module-syms", cl::desc("dump module symbols"),
                             cl::cat(FileOptions),
                             cl::sub(PdbToYamlSubcommand));

cl::list<std::string> InputFilename(cl::Positional,
                                    cl::desc("<input PDB file>"), cl::Required,
                                    cl::sub(PdbToYamlSubcommand));
} // namespace pdb2yaml

namespace analyze {
cl::opt<bool> StringTable("hash-collisions", cl::desc("Find hash collisions"),
                          cl::sub(AnalyzeSubcommand), cl::init(false));
cl::list<std::string> InputFilename(cl::Positional,
                                    cl::desc("<input PDB file>"), cl::Required,
                                    cl::sub(AnalyzeSubcommand));
}

namespace merge {
cl::list<std::string> InputFilenames(cl::Positional,
                                     cl::desc("<input PDB files>"),
                                     cl::OneOrMore, cl::sub(MergeSubcommand));
cl::opt<std::string>
    PdbOutputFile("pdb", cl::desc("the name of the PDB file to write"),
                  cl::sub(MergeSubcommand));
}
}

static ExitOnError ExitOnErr;

static void yamlToPdb(StringRef Path) {
  BumpPtrAllocator Allocator;
  ErrorOr<std::unique_ptr<MemoryBuffer>> ErrorOrBuffer =
      MemoryBuffer::getFileOrSTDIN(Path, /*FileSize=*/-1,
                                   /*RequiresNullTerminator=*/false);

  if (ErrorOrBuffer.getError()) {
    ExitOnErr(make_error<GenericError>(generic_error_code::invalid_path, Path));
  }

  std::unique_ptr<MemoryBuffer> &Buffer = ErrorOrBuffer.get();

  llvm::yaml::Input In(Buffer->getBuffer());
  pdb::yaml::PdbObject YamlObj(Allocator);
  In >> YamlObj;

  PDBFileBuilder Builder(Allocator);

  uint32_t BlockSize = 4096;
  if (YamlObj.Headers.hasValue())
    BlockSize = YamlObj.Headers->SuperBlock.BlockSize;
  ExitOnErr(Builder.initialize(BlockSize));
  // Add each of the reserved streams.  We ignore stream metadata in the
  // yaml, because we will reconstruct our own view of the streams.  For
  // example, the YAML may say that there were 20 streams in the original
  // PDB, but maybe we only dump a subset of those 20 streams, so we will
  // have fewer, and the ones we do have may end up with different indices
  // than the ones in the original PDB.  So we just start with a clean slate.
  for (uint32_t I = 0; I < kSpecialStreamCount; ++I)
    ExitOnErr(Builder.getMsfBuilder().addStream(0));

  StringsAndChecksums Strings;
  Strings.setStrings(std::make_shared<DebugStringTableSubsection>());

  if (YamlObj.StringTable.hasValue()) {
    for (auto S : *YamlObj.StringTable)
      Strings.strings()->insert(S);
  }

  pdb::yaml::PdbInfoStream DefaultInfoStream;
  pdb::yaml::PdbDbiStream DefaultDbiStream;
  pdb::yaml::PdbTpiStream DefaultTpiStream;
  pdb::yaml::PdbTpiStream DefaultIpiStream;

  const auto &Info = YamlObj.PdbStream.getValueOr(DefaultInfoStream);

  auto &InfoBuilder = Builder.getInfoBuilder();
  InfoBuilder.setAge(Info.Age);
  InfoBuilder.setGuid(Info.Guid);
  InfoBuilder.setSignature(Info.Signature);
  InfoBuilder.setVersion(Info.Version);
  for (auto F : Info.Features)
    InfoBuilder.addFeature(F);

  const auto &Dbi = YamlObj.DbiStream.getValueOr(DefaultDbiStream);
  auto &DbiBuilder = Builder.getDbiBuilder();
  DbiBuilder.setAge(Dbi.Age);
  DbiBuilder.setBuildNumber(Dbi.BuildNumber);
  DbiBuilder.setFlags(Dbi.Flags);
  DbiBuilder.setMachineType(Dbi.MachineType);
  DbiBuilder.setPdbDllRbld(Dbi.PdbDllRbld);
  DbiBuilder.setPdbDllVersion(Dbi.PdbDllVersion);
  DbiBuilder.setVersionHeader(Dbi.VerHeader);
  for (const auto &MI : Dbi.ModInfos) {
    auto &ModiBuilder = ExitOnErr(DbiBuilder.addModuleInfo(MI.Mod));
    ModiBuilder.setObjFileName(MI.Obj);

    for (auto S : MI.SourceFiles)
      ExitOnErr(DbiBuilder.addModuleSourceFile(MI.Mod, S));
    if (MI.Modi.hasValue()) {
      const auto &ModiStream = *MI.Modi;
      for (auto Symbol : ModiStream.Symbols) {
        ModiBuilder.addSymbol(
            Symbol.toCodeViewSymbol(Allocator, CodeViewContainer::Pdb));
      }
    }

    // Each module has its own checksum subsection, so scan for it every time.
    Strings.setChecksums(nullptr);
    CodeViewYAML::initializeStringsAndChecksums(MI.Subsections, Strings);

    auto CodeViewSubsections = ExitOnErr(CodeViewYAML::toCodeViewSubsectionList(
        Allocator, MI.Subsections, Strings));
    for (auto &SS : CodeViewSubsections) {
      ModiBuilder.addDebugSubsection(SS);
    }
  }

  auto &TpiBuilder = Builder.getTpiBuilder();
  const auto &Tpi = YamlObj.TpiStream.getValueOr(DefaultTpiStream);
  TpiBuilder.setVersionHeader(Tpi.Version);
  for (const auto &R : Tpi.Records) {
    CVType Type = R.toCodeViewRecord(Allocator);
    TpiBuilder.addTypeRecord(Type.RecordData, None);
  }

  const auto &Ipi = YamlObj.IpiStream.getValueOr(DefaultIpiStream);
  auto &IpiBuilder = Builder.getIpiBuilder();
  IpiBuilder.setVersionHeader(Ipi.Version);
  for (const auto &R : Ipi.Records) {
    CVType Type = R.toCodeViewRecord(Allocator);
    IpiBuilder.addTypeRecord(Type.RecordData, None);
  }

  Builder.getStringTableBuilder().setStrings(*Strings.strings());

  ExitOnErr(Builder.commit(opts::yaml2pdb::YamlPdbOutputFile));
}

static PDBFile &loadPDB(StringRef Path, std::unique_ptr<IPDBSession> &Session) {
  ExitOnErr(loadDataForPDB(PDB_ReaderType::Native, Path, Session));

  NativeSession *NS = static_cast<NativeSession *>(Session.get());
  return NS->getPDBFile();
}

static void pdb2Yaml(StringRef Path) {
  std::unique_ptr<IPDBSession> Session;
  auto &File = loadPDB(Path, Session);

  auto O = llvm::make_unique<YAMLOutputStyle>(File);
  O = llvm::make_unique<YAMLOutputStyle>(File);

  ExitOnErr(O->dump());
}

static void dumpRaw(StringRef Path) {
  std::unique_ptr<IPDBSession> Session;
  auto &File = loadPDB(Path, Session);

  auto O = llvm::make_unique<DumpOutputStyle>(File);

  ExitOnErr(O->dump());
}

static void dumpBytes(StringRef Path) {
  std::unique_ptr<IPDBSession> Session;
  auto &File = loadPDB(Path, Session);

  auto O = llvm::make_unique<BytesOutputStyle>(File);

  ExitOnErr(O->dump());
}

static void dumpAnalysis(StringRef Path) {
  std::unique_ptr<IPDBSession> Session;
  auto &File = loadPDB(Path, Session);
  auto O = llvm::make_unique<AnalysisStyle>(File);

  ExitOnErr(O->dump());
}

static void diff(StringRef Path1, StringRef Path2) {
  std::unique_ptr<IPDBSession> Session1;
  std::unique_ptr<IPDBSession> Session2;

  auto &File1 = loadPDB(Path1, Session1);
  auto &File2 = loadPDB(Path2, Session2);

  auto O = llvm::make_unique<DiffStyle>(File1, File2);

  ExitOnErr(O->dump());
}

bool opts::pretty::shouldDumpSymLevel(SymLevel Search) {
  if (SymTypes.empty())
    return true;
  if (llvm::find(SymTypes, Search) != SymTypes.end())
    return true;
  if (llvm::find(SymTypes, SymLevel::All) != SymTypes.end())
    return true;
  return false;
}

uint32_t llvm::pdb::getTypeLength(const PDBSymbolData &Symbol) {
  auto SymbolType = Symbol.getType();
  const IPDBRawSymbol &RawType = SymbolType->getRawSymbol();

  return RawType.getLength();
}

bool opts::pretty::compareFunctionSymbols(
    const std::unique_ptr<PDBSymbolFunc> &F1,
    const std::unique_ptr<PDBSymbolFunc> &F2) {
  assert(opts::pretty::SymbolOrder != opts::pretty::SymbolSortMode::None);

  if (opts::pretty::SymbolOrder == opts::pretty::SymbolSortMode::Name)
    return F1->getName() < F2->getName();

  // Note that we intentionally sort in descending order on length, since
  // long functions are more interesting than short functions.
  return F1->getLength() > F2->getLength();
}

bool opts::pretty::compareDataSymbols(
    const std::unique_ptr<PDBSymbolData> &F1,
    const std::unique_ptr<PDBSymbolData> &F2) {
  assert(opts::pretty::SymbolOrder != opts::pretty::SymbolSortMode::None);

  if (opts::pretty::SymbolOrder == opts::pretty::SymbolSortMode::Name)
    return F1->getName() < F2->getName();

  // Note that we intentionally sort in descending order on length, since
  // large types are more interesting than short ones.
  return getTypeLength(*F1) > getTypeLength(*F2);
}

static void dumpPretty(StringRef Path) {
  std::unique_ptr<IPDBSession> Session;

  const auto ReaderType =
      opts::pretty::Native ? PDB_ReaderType::Native : PDB_ReaderType::DIA;
  ExitOnErr(loadDataForPDB(ReaderType, Path, Session));

  if (opts::pretty::LoadAddress)
    Session->setLoadAddress(opts::pretty::LoadAddress);

  auto &Stream = outs();
  const bool UseColor = opts::pretty::ColorOutput == cl::BOU_UNSET
                            ? Stream.has_colors()
                            : opts::pretty::ColorOutput == cl::BOU_TRUE;
  LinePrinter Printer(2, UseColor, Stream);

  auto GlobalScope(Session->getGlobalScope());
  std::string FileName(GlobalScope->getSymbolsFileName());

  WithColor(Printer, PDB_ColorItem::None).get() << "Summary for ";
  WithColor(Printer, PDB_ColorItem::Path).get() << FileName;
  Printer.Indent();
  uint64_t FileSize = 0;

  Printer.NewLine();
  WithColor(Printer, PDB_ColorItem::Identifier).get() << "Size";
  if (!sys::fs::file_size(FileName, FileSize)) {
    Printer << ": " << FileSize << " bytes";
  } else {
    Printer << ": (Unable to obtain file size)";
  }

  Printer.NewLine();
  WithColor(Printer, PDB_ColorItem::Identifier).get() << "Guid";
  Printer << ": " << GlobalScope->getGuid();

  Printer.NewLine();
  WithColor(Printer, PDB_ColorItem::Identifier).get() << "Age";
  Printer << ": " << GlobalScope->getAge();

  Printer.NewLine();
  WithColor(Printer, PDB_ColorItem::Identifier).get() << "Attributes";
  Printer << ": ";
  if (GlobalScope->hasCTypes())
    outs() << "HasCTypes ";
  if (GlobalScope->hasPrivateSymbols())
    outs() << "HasPrivateSymbols ";
  Printer.Unindent();

  if (opts::pretty::Compilands) {
    Printer.NewLine();
    WithColor(Printer, PDB_ColorItem::SectionHeader).get()
        << "---COMPILANDS---";
    Printer.Indent();
    auto Compilands = GlobalScope->findAllChildren<PDBSymbolCompiland>();
    CompilandDumper Dumper(Printer);
    CompilandDumpFlags options = CompilandDumper::Flags::None;
    if (opts::pretty::Lines)
      options = options | CompilandDumper::Flags::Lines;
    while (auto Compiland = Compilands->getNext())
      Dumper.start(*Compiland, options);
    Printer.Unindent();
  }

  if (opts::pretty::Classes || opts::pretty::Enums || opts::pretty::Typedefs) {
    Printer.NewLine();
    WithColor(Printer, PDB_ColorItem::SectionHeader).get() << "---TYPES---";
    Printer.Indent();
    TypeDumper Dumper(Printer);
    Dumper.start(*GlobalScope);
    Printer.Unindent();
  }

  if (opts::pretty::Symbols) {
    Printer.NewLine();
    WithColor(Printer, PDB_ColorItem::SectionHeader).get() << "---SYMBOLS---";
    Printer.Indent();
    auto Compilands = GlobalScope->findAllChildren<PDBSymbolCompiland>();
    CompilandDumper Dumper(Printer);
    while (auto Compiland = Compilands->getNext())
      Dumper.start(*Compiland, true);
    Printer.Unindent();
  }

  if (opts::pretty::Globals) {
    Printer.NewLine();
    WithColor(Printer, PDB_ColorItem::SectionHeader).get() << "---GLOBALS---";
    Printer.Indent();
    if (shouldDumpSymLevel(opts::pretty::SymLevel::Functions)) {
      FunctionDumper Dumper(Printer);
      auto Functions = GlobalScope->findAllChildren<PDBSymbolFunc>();
      if (opts::pretty::SymbolOrder == opts::pretty::SymbolSortMode::None) {
        while (auto Function = Functions->getNext()) {
          Printer.NewLine();
          Dumper.start(*Function, FunctionDumper::PointerType::None);
        }
      } else {
        std::vector<std::unique_ptr<PDBSymbolFunc>> Funcs;
        while (auto Func = Functions->getNext())
          Funcs.push_back(std::move(Func));
        std::sort(Funcs.begin(), Funcs.end(),
                  opts::pretty::compareFunctionSymbols);
        for (const auto &Func : Funcs) {
          Printer.NewLine();
          Dumper.start(*Func, FunctionDumper::PointerType::None);
        }
      }
    }
    if (shouldDumpSymLevel(opts::pretty::SymLevel::Data)) {
      auto Vars = GlobalScope->findAllChildren<PDBSymbolData>();
      VariableDumper Dumper(Printer);
      if (opts::pretty::SymbolOrder == opts::pretty::SymbolSortMode::None) {
        while (auto Var = Vars->getNext())
          Dumper.start(*Var);
      } else {
        std::vector<std::unique_ptr<PDBSymbolData>> Datas;
        while (auto Var = Vars->getNext())
          Datas.push_back(std::move(Var));
        std::sort(Datas.begin(), Datas.end(), opts::pretty::compareDataSymbols);
        for (const auto &Var : Datas)
          Dumper.start(*Var);
      }
    }
    if (shouldDumpSymLevel(opts::pretty::SymLevel::Thunks)) {
      auto Thunks = GlobalScope->findAllChildren<PDBSymbolThunk>();
      CompilandDumper Dumper(Printer);
      while (auto Thunk = Thunks->getNext())
        Dumper.dump(*Thunk);
    }
    Printer.Unindent();
  }
  if (opts::pretty::Externals) {
    Printer.NewLine();
    WithColor(Printer, PDB_ColorItem::SectionHeader).get() << "---EXTERNALS---";
    Printer.Indent();
    ExternalSymbolDumper Dumper(Printer);
    Dumper.start(*GlobalScope);
  }
  if (opts::pretty::Lines) {
    Printer.NewLine();
  }
  outs().flush();
}

static void mergePdbs() {
  BumpPtrAllocator Allocator;
  TypeTableBuilder MergedTpi(Allocator);
  TypeTableBuilder MergedIpi(Allocator);

  // Create a Tpi and Ipi type table with all types from all input files.
  for (const auto &Path : opts::merge::InputFilenames) {
    std::unique_ptr<IPDBSession> Session;
    auto &File = loadPDB(Path, Session);
    SmallVector<TypeIndex, 128> TypeMap;
    SmallVector<TypeIndex, 128> IdMap;
    if (File.hasPDBTpiStream()) {
      auto &Tpi = ExitOnErr(File.getPDBTpiStream());
      ExitOnErr(codeview::mergeTypeRecords(MergedTpi, TypeMap, nullptr,
                                           Tpi.typeArray()));
    }
    if (File.hasPDBIpiStream()) {
      auto &Ipi = ExitOnErr(File.getPDBIpiStream());
      ExitOnErr(codeview::mergeIdRecords(MergedIpi, TypeMap, IdMap,
                                         Ipi.typeArray()));
    }
  }

  // Then write the PDB.
  PDBFileBuilder Builder(Allocator);
  ExitOnErr(Builder.initialize(4096));
  // Add each of the reserved streams.  We might not put any data in them,
  // but at least they have to be present.
  for (uint32_t I = 0; I < kSpecialStreamCount; ++I)
    ExitOnErr(Builder.getMsfBuilder().addStream(0));

  auto &DestTpi = Builder.getTpiBuilder();
  auto &DestIpi = Builder.getIpiBuilder();
  MergedTpi.ForEachRecord([&DestTpi](TypeIndex TI, ArrayRef<uint8_t> Data) {
    DestTpi.addTypeRecord(Data, None);
  });
  MergedIpi.ForEachRecord([&DestIpi](TypeIndex TI, ArrayRef<uint8_t> Data) {
    DestIpi.addTypeRecord(Data, None);
  });
  Builder.getInfoBuilder().addFeature(PdbRaw_FeatureSig::VC140);

  SmallString<64> OutFile(opts::merge::PdbOutputFile);
  if (OutFile.empty()) {
    OutFile = opts::merge::InputFilenames[0];
    llvm::sys::path::replace_extension(OutFile, "merged.pdb");
  }
  ExitOnErr(Builder.commit(OutFile));
}

static bool parseRange(StringRef Str,
                       Optional<opts::bytes::NumberRange> &Parsed) {
  if (Str.empty())
    return true;

  llvm::Regex R("^([^-]+)(-([^-]+))?$");
  llvm::SmallVector<llvm::StringRef, 2> Matches;
  if (!R.match(Str, &Matches))
    return false;

  Parsed.emplace();
  if (!to_integer(Matches[1], Parsed->Min))
    return false;

  if (!Matches[3].empty()) {
    Parsed->Max.emplace();
    if (!to_integer(Matches[3], *Parsed->Max))
      return false;
  }
  return true;
}

int main(int argc_, const char *argv_[]) {
  // Print a stack trace if we signal out.
  sys::PrintStackTraceOnErrorSignal(argv_[0]);
  PrettyStackTraceProgram X(argc_, argv_);

  ExitOnErr.setBanner("llvm-pdbutil: ");

  SmallVector<const char *, 256> argv;
  SpecificBumpPtrAllocator<char> ArgAllocator;
  ExitOnErr(errorCodeToError(sys::Process::GetArgumentVector(
      argv, makeArrayRef(argv_, argc_), ArgAllocator)));

  llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.

  cl::ParseCommandLineOptions(argv.size(), argv.data(), "LLVM PDB Dumper\n");

  if (opts::BytesSubcommand) {
    if (!parseRange(opts::bytes::DumpBlockRangeOpt,
                    opts::bytes::DumpBlockRange)) {
      errs() << "Argument '" << opts::bytes::DumpBlockRangeOpt
             << "' invalid format.\n";
      errs().flush();
      exit(1);
    }
    if (!parseRange(opts::bytes::DumpByteRangeOpt,
                    opts::bytes::DumpByteRange)) {
      errs() << "Argument '" << opts::bytes::DumpByteRangeOpt
             << "' invalid format.\n";
      errs().flush();
      exit(1);
    }
  }

  if (opts::DumpSubcommand) {
    if (opts::dump::RawAll) {
      opts::dump::DumpLines = true;
      opts::dump::DumpInlineeLines = true;
      opts::dump::DumpXme = true;
      opts::dump::DumpXmi = true;
      opts::dump::DumpIds = true;
      opts::dump::DumpPublics = true;
      opts::dump::DumpSectionContribs = true;
      opts::dump::DumpSectionMap = true;
      opts::dump::DumpStreams = true;
      opts::dump::DumpStreamBlocks = true;
      opts::dump::DumpStringTable = true;
      opts::dump::DumpSummary = true;
      opts::dump::DumpSymbols = true;
      opts::dump::DumpIds = true;
      opts::dump::DumpIdExtras = true;
      opts::dump::DumpTypes = true;
      opts::dump::DumpTypeExtras = true;
      opts::dump::DumpModules = true;
      opts::dump::DumpModuleFiles = true;
    }
  }
  if (opts::PdbToYamlSubcommand) {
    if (opts::pdb2yaml::All) {
      opts::pdb2yaml::StreamMetadata = true;
      opts::pdb2yaml::StreamDirectory = true;
      opts::pdb2yaml::PdbStream = true;
      opts::pdb2yaml::StringTable = true;
      opts::pdb2yaml::DbiStream = true;
      opts::pdb2yaml::TpiStream = true;
      opts::pdb2yaml::IpiStream = true;
      opts::pdb2yaml::DumpModules = true;
      opts::pdb2yaml::DumpModuleFiles = true;
      opts::pdb2yaml::DumpModuleSyms = true;
      opts::pdb2yaml::DumpModuleSubsections.push_back(
          opts::ModuleSubsection::All);
      if (llvm::is_contained(opts::pdb2yaml::DumpModuleSubsections,
                             opts::ModuleSubsection::All)) {
        opts::pdb2yaml::DumpModuleSubsections.reset();
        opts::pdb2yaml::DumpModuleSubsections.push_back(
            opts::ModuleSubsection::All);
      }
    }

    if (opts::pdb2yaml::DumpModuleSyms || opts::pdb2yaml::DumpModuleFiles)
      opts::pdb2yaml::DumpModules = true;

    if (opts::pdb2yaml::DumpModules)
      opts::pdb2yaml::DbiStream = true;
  }

  llvm::sys::InitializeCOMRAII COM(llvm::sys::COMThreadingMode::MultiThreaded);

  if (opts::PdbToYamlSubcommand) {
    pdb2Yaml(opts::pdb2yaml::InputFilename.front());
  } else if (opts::YamlToPdbSubcommand) {
    if (opts::yaml2pdb::YamlPdbOutputFile.empty()) {
      SmallString<16> OutputFilename(opts::yaml2pdb::InputFilename.getValue());
      sys::path::replace_extension(OutputFilename, ".pdb");
      opts::yaml2pdb::YamlPdbOutputFile = OutputFilename.str();
    }
    yamlToPdb(opts::yaml2pdb::InputFilename);
  } else if (opts::AnalyzeSubcommand) {
    dumpAnalysis(opts::analyze::InputFilename.front());
  } else if (opts::PrettySubcommand) {
    if (opts::pretty::Lines)
      opts::pretty::Compilands = true;

    if (opts::pretty::All) {
      opts::pretty::Compilands = true;
      opts::pretty::Symbols = true;
      opts::pretty::Globals = true;
      opts::pretty::Types = true;
      opts::pretty::Externals = true;
      opts::pretty::Lines = true;
    }

    if (opts::pretty::Types) {
      opts::pretty::Classes = true;
      opts::pretty::Typedefs = true;
      opts::pretty::Enums = true;
    }

    // When adding filters for excluded compilands and types, we need to
    // remember that these are regexes.  So special characters such as * and \
    // need to be escaped in the regex.  In the case of a literal \, this means
    // it needs to be escaped again in the C++.  So matching a single \ in the
    // input requires 4 \es in the C++.
    if (opts::pretty::ExcludeCompilerGenerated) {
      opts::pretty::ExcludeTypes.push_back("__vc_attributes");
      opts::pretty::ExcludeCompilands.push_back("\\* Linker \\*");
    }
    if (opts::pretty::ExcludeSystemLibraries) {
      opts::pretty::ExcludeCompilands.push_back(
          "f:\\\\binaries\\\\Intermediate\\\\vctools\\\\crt_bld");
      opts::pretty::ExcludeCompilands.push_back("f:\\\\dd\\\\vctools\\\\crt");
      opts::pretty::ExcludeCompilands.push_back(
          "d:\\\\th.obj.x86fre\\\\minkernel");
    }
    std::for_each(opts::pretty::InputFilenames.begin(),
                  opts::pretty::InputFilenames.end(), dumpPretty);
  } else if (opts::DumpSubcommand) {
    std::for_each(opts::dump::InputFilenames.begin(),
                  opts::dump::InputFilenames.end(), dumpRaw);
  } else if (opts::BytesSubcommand) {
    std::for_each(opts::bytes::InputFilenames.begin(),
                  opts::bytes::InputFilenames.end(), dumpBytes);
  } else if (opts::DiffSubcommand) {
    if (opts::diff::InputFilenames.size() != 2) {
      errs() << "diff subcommand expects exactly 2 arguments.\n";
      exit(1);
    }
    diff(opts::diff::InputFilenames[0], opts::diff::InputFilenames[1]);
  } else if (opts::MergeSubcommand) {
    if (opts::merge::InputFilenames.size() < 2) {
      errs() << "merge subcommand requires at least 2 input files.\n";
      exit(1);
    }
    mergePdbs();
  }

  outs().flush();
  return 0;
}