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diff --git a/contrib/llvm-project/llvm/tools/llc/llc.cpp b/contrib/llvm-project/llvm/tools/llc/llc.cpp
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+//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This is the llc code generator driver. It provides a convenient
+// command-line interface for generating native assembly-language code
+// or C code, given LLVM bitcode.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
+#include "llvm/CodeGen/CommandFlags.inc"
+#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
+#include "llvm/CodeGen/LinkAllCodegenComponents.h"
+#include "llvm/CodeGen/MIRParser/MIRParser.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/TargetPassConfig.h"
+#include "llvm/CodeGen/TargetSubtargetInfo.h"
+#include "llvm/IR/AutoUpgrade.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/IR/DiagnosticPrinter.h"
+#include "llvm/IR/IRPrintingPasses.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/RemarkStreamer.h"
+#include "llvm/IR/Verifier.h"
+#include "llvm/IRReader/IRReader.h"
+#include "llvm/MC/SubtargetFeature.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/PluginLoader.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/WithColor.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Transforms/Utils/Cloning.h"
+#include <memory>
+using namespace llvm;
+
+// General options for llc. Other pass-specific options are specified
+// within the corresponding llc passes, and target-specific options
+// and back-end code generation options are specified with the target machine.
+//
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
+
+static cl::opt<std::string>
+InputLanguage("x", cl::desc("Input language ('ir' or 'mir')"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
+
+static cl::opt<std::string>
+ SplitDwarfOutputFile("split-dwarf-output",
+ cl::desc(".dwo output filename"),
+ cl::value_desc("filename"));
+
+static cl::opt<unsigned>
+TimeCompilations("time-compilations", cl::Hidden, cl::init(1u),
+ cl::value_desc("N"),
+ cl::desc("Repeat compilation N times for timing"));
+
+static cl::opt<bool>
+NoIntegratedAssembler("no-integrated-as", cl::Hidden,
+ cl::desc("Disable integrated assembler"));
+
+static cl::opt<bool>
+ PreserveComments("preserve-as-comments", cl::Hidden,
+ cl::desc("Preserve Comments in outputted assembly"),
+ cl::init(true));
+
+// Determine optimization level.
+static cl::opt<char>
+OptLevel("O",
+ cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
+ "(default = '-O2')"),
+ cl::Prefix,
+ cl::ZeroOrMore,
+ cl::init(' '));
+
+static cl::opt<std::string>
+TargetTriple("mtriple", cl::desc("Override target triple for module"));
+
+static cl::opt<std::string> SplitDwarfFile(
+ "split-dwarf-file",
+ cl::desc(
+ "Specify the name of the .dwo file to encode in the DWARF output"));
+
+static cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
+ cl::desc("Do not verify input module"));
+
+static cl::opt<bool> DisableSimplifyLibCalls("disable-simplify-libcalls",
+ cl::desc("Disable simplify-libcalls"));
+
+static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,
+ cl::desc("Show encoding in .s output"));
+
+static cl::opt<bool> EnableDwarfDirectory(
+ "enable-dwarf-directory", cl::Hidden,
+ cl::desc("Use .file directives with an explicit directory."));
+
+static cl::opt<bool> AsmVerbose("asm-verbose",
+ cl::desc("Add comments to directives."),
+ cl::init(true));
+
+static cl::opt<bool>
+ CompileTwice("compile-twice", cl::Hidden,
+ cl::desc("Run everything twice, re-using the same pass "
+ "manager and verify the result is the same."),
+ cl::init(false));
+
+static cl::opt<bool> DiscardValueNames(
+ "discard-value-names",
+ cl::desc("Discard names from Value (other than GlobalValue)."),
+ cl::init(false), cl::Hidden);
+
+static cl::list<std::string> IncludeDirs("I", cl::desc("include search path"));
+
+static cl::opt<bool> RemarksWithHotness(
+ "pass-remarks-with-hotness",
+ cl::desc("With PGO, include profile count in optimization remarks"),
+ cl::Hidden);
+
+static cl::opt<unsigned>
+ RemarksHotnessThreshold("pass-remarks-hotness-threshold",
+ cl::desc("Minimum profile count required for "
+ "an optimization remark to be output"),
+ cl::Hidden);
+
+static cl::opt<std::string>
+ RemarksFilename("pass-remarks-output",
+ cl::desc("Output filename for pass remarks"),
+ cl::value_desc("filename"));
+
+static cl::opt<std::string>
+ RemarksPasses("pass-remarks-filter",
+ cl::desc("Only record optimization remarks from passes whose "
+ "names match the given regular expression"),
+ cl::value_desc("regex"));
+
+static cl::opt<std::string> RemarksFormat(
+ "pass-remarks-format",
+ cl::desc("The format used for serializing remarks (default: YAML)"),
+ cl::value_desc("format"), cl::init("yaml"));
+
+namespace {
+static ManagedStatic<std::vector<std::string>> RunPassNames;
+
+struct RunPassOption {
+ void operator=(const std::string &Val) const {
+ if (Val.empty())
+ return;
+ SmallVector<StringRef, 8> PassNames;
+ StringRef(Val).split(PassNames, ',', -1, false);
+ for (auto PassName : PassNames)
+ RunPassNames->push_back(PassName);
+ }
+};
+}
+
+static RunPassOption RunPassOpt;
+
+static cl::opt<RunPassOption, true, cl::parser<std::string>> RunPass(
+ "run-pass",
+ cl::desc("Run compiler only for specified passes (comma separated list)"),
+ cl::value_desc("pass-name"), cl::ZeroOrMore, cl::location(RunPassOpt));
+
+static int compileModule(char **, LLVMContext &);
+
+static std::unique_ptr<ToolOutputFile> GetOutputStream(const char *TargetName,
+ Triple::OSType OS,
+ const char *ProgName) {
+ // If we don't yet have an output filename, make one.
+ if (OutputFilename.empty()) {
+ if (InputFilename == "-")
+ OutputFilename = "-";
+ else {
+ // If InputFilename ends in .bc or .ll, remove it.
+ StringRef IFN = InputFilename;
+ if (IFN.endswith(".bc") || IFN.endswith(".ll"))
+ OutputFilename = IFN.drop_back(3);
+ else if (IFN.endswith(".mir"))
+ OutputFilename = IFN.drop_back(4);
+ else
+ OutputFilename = IFN;
+
+ switch (FileType) {
+ case TargetMachine::CGFT_AssemblyFile:
+ if (TargetName[0] == 'c') {
+ if (TargetName[1] == 0)
+ OutputFilename += ".cbe.c";
+ else if (TargetName[1] == 'p' && TargetName[2] == 'p')
+ OutputFilename += ".cpp";
+ else
+ OutputFilename += ".s";
+ } else
+ OutputFilename += ".s";
+ break;
+ case TargetMachine::CGFT_ObjectFile:
+ if (OS == Triple::Win32)
+ OutputFilename += ".obj";
+ else
+ OutputFilename += ".o";
+ break;
+ case TargetMachine::CGFT_Null:
+ OutputFilename += ".null";
+ break;
+ }
+ }
+ }
+
+ // Decide if we need "binary" output.
+ bool Binary = false;
+ switch (FileType) {
+ case TargetMachine::CGFT_AssemblyFile:
+ break;
+ case TargetMachine::CGFT_ObjectFile:
+ case TargetMachine::CGFT_Null:
+ Binary = true;
+ break;
+ }
+
+ // Open the file.
+ std::error_code EC;
+ sys::fs::OpenFlags OpenFlags = sys::fs::OF_None;
+ if (!Binary)
+ OpenFlags |= sys::fs::OF_Text;
+ auto FDOut = std::make_unique<ToolOutputFile>(OutputFilename, EC, OpenFlags);
+ if (EC) {
+ WithColor::error() << EC.message() << '\n';
+ return nullptr;
+ }
+
+ return FDOut;
+}
+
+struct LLCDiagnosticHandler : public DiagnosticHandler {
+ bool *HasError;
+ LLCDiagnosticHandler(bool *HasErrorPtr) : HasError(HasErrorPtr) {}
+ bool handleDiagnostics(const DiagnosticInfo &DI) override {
+ if (DI.getSeverity() == DS_Error)
+ *HasError = true;
+
+ if (auto *Remark = dyn_cast<DiagnosticInfoOptimizationBase>(&DI))
+ if (!Remark->isEnabled())
+ return true;
+
+ DiagnosticPrinterRawOStream DP(errs());
+ errs() << LLVMContext::getDiagnosticMessagePrefix(DI.getSeverity()) << ": ";
+ DI.print(DP);
+ errs() << "\n";
+ return true;
+ }
+};
+
+static void InlineAsmDiagHandler(const SMDiagnostic &SMD, void *Context,
+ unsigned LocCookie) {
+ bool *HasError = static_cast<bool *>(Context);
+ if (SMD.getKind() == SourceMgr::DK_Error)
+ *HasError = true;
+
+ SMD.print(nullptr, errs());
+
+ // For testing purposes, we print the LocCookie here.
+ if (LocCookie)
+ WithColor::note() << "!srcloc = " << LocCookie << "\n";
+}
+
+// main - Entry point for the llc compiler.
+//
+int main(int argc, char **argv) {
+ InitLLVM X(argc, argv);
+
+ // Enable debug stream buffering.
+ EnableDebugBuffering = true;
+
+ LLVMContext Context;
+
+ // Initialize targets first, so that --version shows registered targets.
+ InitializeAllTargets();
+ InitializeAllTargetMCs();
+ InitializeAllAsmPrinters();
+ InitializeAllAsmParsers();
+
+ // Initialize codegen and IR passes used by llc so that the -print-after,
+ // -print-before, and -stop-after options work.
+ PassRegistry *Registry = PassRegistry::getPassRegistry();
+ initializeCore(*Registry);
+ initializeCodeGen(*Registry);
+ initializeLoopStrengthReducePass(*Registry);
+ initializeLowerIntrinsicsPass(*Registry);
+ initializeEntryExitInstrumenterPass(*Registry);
+ initializePostInlineEntryExitInstrumenterPass(*Registry);
+ initializeUnreachableBlockElimLegacyPassPass(*Registry);
+ initializeConstantHoistingLegacyPassPass(*Registry);
+ initializeScalarOpts(*Registry);
+ initializeVectorization(*Registry);
+ initializeScalarizeMaskedMemIntrinPass(*Registry);
+ initializeExpandReductionsPass(*Registry);
+ initializeHardwareLoopsPass(*Registry);
+
+ // Initialize debugging passes.
+ initializeScavengerTestPass(*Registry);
+
+ // Register the target printer for --version.
+ cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
+
+ cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
+
+ Context.setDiscardValueNames(DiscardValueNames);
+
+ // Set a diagnostic handler that doesn't exit on the first error
+ bool HasError = false;
+ Context.setDiagnosticHandler(
+ std::make_unique<LLCDiagnosticHandler>(&HasError));
+ Context.setInlineAsmDiagnosticHandler(InlineAsmDiagHandler, &HasError);
+
+ Expected<std::unique_ptr<ToolOutputFile>> RemarksFileOrErr =
+ setupOptimizationRemarks(Context, RemarksFilename, RemarksPasses,
+ RemarksFormat, RemarksWithHotness,
+ RemarksHotnessThreshold);
+ if (Error E = RemarksFileOrErr.takeError()) {
+ WithColor::error(errs(), argv[0]) << toString(std::move(E)) << '\n';
+ return 1;
+ }
+ std::unique_ptr<ToolOutputFile> RemarksFile = std::move(*RemarksFileOrErr);
+
+ if (InputLanguage != "" && InputLanguage != "ir" &&
+ InputLanguage != "mir") {
+ WithColor::error(errs(), argv[0])
+ << "input language must be '', 'IR' or 'MIR'\n";
+ return 1;
+ }
+
+ // Compile the module TimeCompilations times to give better compile time
+ // metrics.
+ for (unsigned I = TimeCompilations; I; --I)
+ if (int RetVal = compileModule(argv, Context))
+ return RetVal;
+
+ if (RemarksFile)
+ RemarksFile->keep();
+ return 0;
+}
+
+static bool addPass(PassManagerBase &PM, const char *argv0,
+ StringRef PassName, TargetPassConfig &TPC) {
+ if (PassName == "none")
+ return false;
+
+ const PassRegistry *PR = PassRegistry::getPassRegistry();
+ const PassInfo *PI = PR->getPassInfo(PassName);
+ if (!PI) {
+ WithColor::error(errs(), argv0)
+ << "run-pass " << PassName << " is not registered.\n";
+ return true;
+ }
+
+ Pass *P;
+ if (PI->getNormalCtor())
+ P = PI->getNormalCtor()();
+ else {
+ WithColor::error(errs(), argv0)
+ << "cannot create pass: " << PI->getPassName() << "\n";
+ return true;
+ }
+ std::string Banner = std::string("After ") + std::string(P->getPassName());
+ PM.add(P);
+ TPC.printAndVerify(Banner);
+
+ return false;
+}
+
+static int compileModule(char **argv, LLVMContext &Context) {
+ // Load the module to be compiled...
+ SMDiagnostic Err;
+ std::unique_ptr<Module> M;
+ std::unique_ptr<MIRParser> MIR;
+ Triple TheTriple;
+
+ bool SkipModule = MCPU == "help" ||
+ (!MAttrs.empty() && MAttrs.front() == "help");
+
+ // If user just wants to list available options, skip module loading
+ if (!SkipModule) {
+ if (InputLanguage == "mir" ||
+ (InputLanguage == "" && StringRef(InputFilename).endswith(".mir"))) {
+ MIR = createMIRParserFromFile(InputFilename, Err, Context);
+ if (MIR)
+ M = MIR->parseIRModule();
+ } else
+ M = parseIRFile(InputFilename, Err, Context, false);
+ if (!M) {
+ Err.print(argv[0], WithColor::error(errs(), argv[0]));
+ return 1;
+ }
+
+ // If we are supposed to override the target triple, do so now.
+ if (!TargetTriple.empty())
+ M->setTargetTriple(Triple::normalize(TargetTriple));
+ TheTriple = Triple(M->getTargetTriple());
+ } else {
+ TheTriple = Triple(Triple::normalize(TargetTriple));
+ }
+
+ if (TheTriple.getTriple().empty())
+ TheTriple.setTriple(sys::getDefaultTargetTriple());
+
+ // Get the target specific parser.
+ std::string Error;
+ const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple,
+ Error);
+ if (!TheTarget) {
+ WithColor::error(errs(), argv[0]) << Error;
+ return 1;
+ }
+
+ std::string CPUStr = getCPUStr(), FeaturesStr = getFeaturesStr();
+
+ CodeGenOpt::Level OLvl = CodeGenOpt::Default;
+ switch (OptLevel) {
+ default:
+ WithColor::error(errs(), argv[0]) << "invalid optimization level.\n";
+ return 1;
+ case ' ': break;
+ case '0': OLvl = CodeGenOpt::None; break;
+ case '1': OLvl = CodeGenOpt::Less; break;
+ case '2': OLvl = CodeGenOpt::Default; break;
+ case '3': OLvl = CodeGenOpt::Aggressive; break;
+ }
+
+ TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
+ Options.DisableIntegratedAS = NoIntegratedAssembler;
+ Options.MCOptions.ShowMCEncoding = ShowMCEncoding;
+ Options.MCOptions.MCUseDwarfDirectory = EnableDwarfDirectory;
+ Options.MCOptions.AsmVerbose = AsmVerbose;
+ Options.MCOptions.PreserveAsmComments = PreserveComments;
+ Options.MCOptions.IASSearchPaths = IncludeDirs;
+ Options.MCOptions.SplitDwarfFile = SplitDwarfFile;
+
+ std::unique_ptr<TargetMachine> Target(TheTarget->createTargetMachine(
+ TheTriple.getTriple(), CPUStr, FeaturesStr, Options, getRelocModel(),
+ getCodeModel(), OLvl));
+
+ assert(Target && "Could not allocate target machine!");
+
+ // If we don't have a module then just exit now. We do this down
+ // here since the CPU/Feature help is underneath the target machine
+ // creation.
+ if (SkipModule)
+ return 0;
+
+ assert(M && "Should have exited if we didn't have a module!");
+ if (FloatABIForCalls != FloatABI::Default)
+ Options.FloatABIType = FloatABIForCalls;
+
+ // Figure out where we are going to send the output.
+ std::unique_ptr<ToolOutputFile> Out =
+ GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]);
+ if (!Out) return 1;
+
+ std::unique_ptr<ToolOutputFile> DwoOut;
+ if (!SplitDwarfOutputFile.empty()) {
+ std::error_code EC;
+ DwoOut = std::make_unique<ToolOutputFile>(SplitDwarfOutputFile, EC,
+ sys::fs::OF_None);
+ if (EC) {
+ WithColor::error(errs(), argv[0]) << EC.message() << '\n';
+ return 1;
+ }
+ }
+
+ // Build up all of the passes that we want to do to the module.
+ legacy::PassManager PM;
+
+ // Add an appropriate TargetLibraryInfo pass for the module's triple.
+ TargetLibraryInfoImpl TLII(Triple(M->getTargetTriple()));
+
+ // The -disable-simplify-libcalls flag actually disables all builtin optzns.
+ if (DisableSimplifyLibCalls)
+ TLII.disableAllFunctions();
+ PM.add(new TargetLibraryInfoWrapperPass(TLII));
+
+ // Add the target data from the target machine, if it exists, or the module.
+ M->setDataLayout(Target->createDataLayout());
+
+ // This needs to be done after setting datalayout since it calls verifier
+ // to check debug info whereas verifier relies on correct datalayout.
+ UpgradeDebugInfo(*M);
+
+ // Verify module immediately to catch problems before doInitialization() is
+ // called on any passes.
+ if (!NoVerify && verifyModule(*M, &errs())) {
+ std::string Prefix =
+ (Twine(argv[0]) + Twine(": ") + Twine(InputFilename)).str();
+ WithColor::error(errs(), Prefix) << "input module is broken!\n";
+ return 1;
+ }
+
+ // Override function attributes based on CPUStr, FeaturesStr, and command line
+ // flags.
+ setFunctionAttributes(CPUStr, FeaturesStr, *M);
+
+ if (RelaxAll.getNumOccurrences() > 0 &&
+ FileType != TargetMachine::CGFT_ObjectFile)
+ WithColor::warning(errs(), argv[0])
+ << ": warning: ignoring -mc-relax-all because filetype != obj";
+
+ {
+ raw_pwrite_stream *OS = &Out->os();
+
+ // Manually do the buffering rather than using buffer_ostream,
+ // so we can memcmp the contents in CompileTwice mode
+ SmallVector<char, 0> Buffer;
+ std::unique_ptr<raw_svector_ostream> BOS;
+ if ((FileType != TargetMachine::CGFT_AssemblyFile &&
+ !Out->os().supportsSeeking()) ||
+ CompileTwice) {
+ BOS = std::make_unique<raw_svector_ostream>(Buffer);
+ OS = BOS.get();
+ }
+
+ const char *argv0 = argv[0];
+ LLVMTargetMachine &LLVMTM = static_cast<LLVMTargetMachine &>(*Target);
+ MachineModuleInfoWrapperPass *MMIWP =
+ new MachineModuleInfoWrapperPass(&LLVMTM);
+
+ // Construct a custom pass pipeline that starts after instruction
+ // selection.
+ if (!RunPassNames->empty()) {
+ if (!MIR) {
+ WithColor::warning(errs(), argv[0])
+ << "run-pass is for .mir file only.\n";
+ return 1;
+ }
+ TargetPassConfig &TPC = *LLVMTM.createPassConfig(PM);
+ if (TPC.hasLimitedCodeGenPipeline()) {
+ WithColor::warning(errs(), argv[0])
+ << "run-pass cannot be used with "
+ << TPC.getLimitedCodeGenPipelineReason(" and ") << ".\n";
+ return 1;
+ }
+
+ TPC.setDisableVerify(NoVerify);
+ PM.add(&TPC);
+ PM.add(MMIWP);
+ TPC.printAndVerify("");
+ for (const std::string &RunPassName : *RunPassNames) {
+ if (addPass(PM, argv0, RunPassName, TPC))
+ return 1;
+ }
+ TPC.setInitialized();
+ PM.add(createPrintMIRPass(*OS));
+ PM.add(createFreeMachineFunctionPass());
+ } else if (Target->addPassesToEmitFile(PM, *OS,
+ DwoOut ? &DwoOut->os() : nullptr,
+ FileType, NoVerify, MMIWP)) {
+ WithColor::warning(errs(), argv[0])
+ << "target does not support generation of this"
+ << " file type!\n";
+ return 1;
+ }
+
+ if (MIR) {
+ assert(MMIWP && "Forgot to create MMIWP?");
+ if (MIR->parseMachineFunctions(*M, MMIWP->getMMI()))
+ return 1;
+ }
+
+ // Before executing passes, print the final values of the LLVM options.
+ cl::PrintOptionValues();
+
+ // If requested, run the pass manager over the same module again,
+ // to catch any bugs due to persistent state in the passes. Note that
+ // opt has the same functionality, so it may be worth abstracting this out
+ // in the future.
+ SmallVector<char, 0> CompileTwiceBuffer;
+ if (CompileTwice) {
+ std::unique_ptr<Module> M2(llvm::CloneModule(*M));
+ PM.run(*M2);
+ CompileTwiceBuffer = Buffer;
+ Buffer.clear();
+ }
+
+ PM.run(*M);
+
+ auto HasError =
+ ((const LLCDiagnosticHandler *)(Context.getDiagHandlerPtr()))->HasError;
+ if (*HasError)
+ return 1;
+
+ // Compare the two outputs and make sure they're the same
+ if (CompileTwice) {
+ if (Buffer.size() != CompileTwiceBuffer.size() ||
+ (memcmp(Buffer.data(), CompileTwiceBuffer.data(), Buffer.size()) !=
+ 0)) {
+ errs()
+ << "Running the pass manager twice changed the output.\n"
+ "Writing the result of the second run to the specified output\n"
+ "To generate the one-run comparison binary, just run without\n"
+ "the compile-twice option\n";
+ Out->os() << Buffer;
+ Out->keep();
+ return 1;
+ }
+ }
+
+ if (BOS) {
+ Out->os() << Buffer;
+ }
+ }
+
+ // Declare success.
+ Out->keep();
+ if (DwoOut)
+ DwoOut->keep();
+
+ return 0;
+}
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