main.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2016 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
#include <depfile_shared.h>
#include "preprocessor.h"
#include "moc.h"
#include "outputrevision.h"
#include "collectjson.h"
 
#include <qfile.h>
#include <qfileinfo.h>
#include <qdir.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
 
#include <qcoreapplication.h>
#include <qcommandlineoption.h>
#include <qcommandlineparser.h>
 
#include <memory>
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
/*
    This function looks at two file names and returns the name of the
    infile with a path relative to outfile.
 
    Examples:
 
        /tmp/abc, /tmp/bcd -> abc
        xyz/a/bc, xyz/b/ac -> ../a/bc
        /tmp/abc, xyz/klm -> /tmp/abc
 */
 
static QByteArray combinePath(const QString &infile, const QString &outfile)
{
    QFileInfo inFileInfo(QDir::current(), infile);
    QFileInfo outFileInfo(QDir::current(), outfile);
    const QByteArray relativePath = QFile::encodeName(outFileInfo.dir().relativeFilePath(inFileInfo.filePath()));
#ifdef Q_OS_WIN
    // It's a system limitation.
    // It depends on the Win API function which is used by the program to open files.
    // cl apparently uses the functions that have the MAX_PATH limitation.
    if (outFileInfo.dir().absolutePath().length() + relativePath.length() + 1 >= 260)
        return QFile::encodeName(inFileInfo.absoluteFilePath());
#endif
    return relativePath;
}
 
 
void error(const char *msg = "Invalid argument")
{
    if (msg)
        fprintf(stderr, "moc: %s\n", msg);
}
 
static auto openFileForWriting(const QString &name)
{
    struct Closer { void operator()(FILE *handle) const { fclose(handle); } };
    using R = std::unique_ptr<FILE, Closer>;
 
#ifdef _MSC_VER
    FILE *file;
    if (_wfopen_s(&file, reinterpret_cast<const wchar_t *>(name.utf16()), L"w") != 0)
        return R{};
    return R{file};
#else
    return R{fopen(QFile::encodeName(name).constData(), "w")};
#endif
}
using File = decltype(openFileForWriting({}));
 
static inline bool hasNext(const Symbols &symbols, int i)
{ return (i < symbols.size()); }
 
static inline const Symbol &next(const Symbols &symbols, int &i)
{ return symbols.at(i++); }
 
 
QByteArray composePreprocessorOutput(const Symbols &symbols) {
    QByteArray output;
    int lineNum = 1;
    Token last = PP_NOTOKEN;
    Token secondlast = last;
    int i = 0;
    while (hasNext(symbols, i)) {
        Symbol sym = next(symbols, i);
        switch (sym.token) {
        case PP_NEWLINE:
        case PP_WHITESPACE:
            if (last != PP_WHITESPACE) {
                secondlast = last;
                last = PP_WHITESPACE;
                output += ' ';
            }
            continue;
        case PP_STRING_LITERAL:
            if (last == PP_STRING_LITERAL)
                output.chop(1);
            else if (secondlast == PP_STRING_LITERAL && last == PP_WHITESPACE)
                output.chop(2);
            else
                break;
            output += sym.lexemView().mid(1);
            secondlast = last;
            last = PP_STRING_LITERAL;
            continue;
        case MOC_INCLUDE_BEGIN:
            lineNum = 0;
            continue;
        case MOC_INCLUDE_END:
            lineNum = sym.lineNum;
            continue;
        default:
            break;
        }
        secondlast = last;
        last = sym.token;
 
        const int padding = sym.lineNum - lineNum;
        if (padding > 0) {
            output.resize(output.size() + padding);
            memset(output.data() + output.size() - padding, '\n', padding);
            lineNum = sym.lineNum;
        }
 
        output += sym.lexem();
    }
 
    return output;
}
 
static QStringList argumentsFromCommandLineAndFile(const QStringList &arguments, bool &hasOptionFiles)
{
    QStringList allArguments;
    hasOptionFiles = false;
    allArguments.reserve(arguments.size());
    for (const QString &argument : arguments) {
        // "@file" doesn't start with a '-' so we can't use QCommandLineParser for it
        if (argument.startsWith(u'@')) {
            QString optionsFile = argument;
            optionsFile.remove(0, 1);
            if (optionsFile.isEmpty()) {
                error("The @ option requires an input file");
                return QStringList();
            }
            QFile f(optionsFile);
            if (!f.open(QIODevice::ReadOnly | QIODevice::Text)) {
                error("Cannot open options file specified with @");
                return QStringList();
            }
            hasOptionFiles = true;
            while (!f.atEnd()) {
                QString line = QString::fromLocal8Bit(f.readLine().trimmed());
                if (!line.isEmpty())
                    allArguments << line;
            }
        } else {
            allArguments << argument;
        }
    }
    return allArguments;
}
 
int runMoc(int argc, char **argv)
{
    QCoreApplication app(argc, argv);
    QCoreApplication::setApplicationVersion(QString::fromLatin1(QT_VERSION_STR));
    // let moc identify itself as moc, even if the binary has been renamed
    QCoreApplication::setApplicationName(QString::fromLatin1("moc"));
 
    bool autoInclude = true;
    bool defaultInclude = true;
    Preprocessor pp;
    Moc moc;
    pp.macros["Q_MOC_RUN"];
    pp.macros["__cplusplus"];
 
    // Don't stumble over GCC extensions
    Macro dummyVariadicFunctionMacro;
    dummyVariadicFunctionMacro.isFunction = true;
    dummyVariadicFunctionMacro.isVariadic = true;
    dummyVariadicFunctionMacro.arguments += Symbol(0, PP_IDENTIFIER, "__VA_ARGS__");
    pp.macros["__attribute__"] = dummyVariadicFunctionMacro;
    pp.macros["__declspec"] = dummyVariadicFunctionMacro;
 
    QString filename;
    QString output;
    QFile in;
    File out;
 
    // Note that moc isn't translated.
    // If you use this code as an example for a translated app, make sure to translate the strings.
    QCommandLineParser parser;
    parser.setApplicationDescription(QStringLiteral("Qt Meta Object Compiler version %1 (Qt %2)")
                                     .arg(mocOutputRevision).arg(QString::fromLatin1(QT_VERSION_STR)));
    parser.addHelpOption();
    parser.addVersionOption();
    parser.setSingleDashWordOptionMode(QCommandLineParser::ParseAsLongOptions);
 
    QCommandLineOption outputOption(QStringLiteral("o"));
    outputOption.setDescription(QStringLiteral("Write output to file rather than stdout."));
    outputOption.setValueName(QStringLiteral("file"));
    outputOption.setFlags(QCommandLineOption::ShortOptionStyle);
    parser.addOption(outputOption);
 
    QCommandLineOption includePathOption(QStringLiteral("I"));
    includePathOption.setDescription(QStringLiteral("Add dir to the include path for header files."));
    includePathOption.setValueName(QStringLiteral("dir"));
    includePathOption.setFlags(QCommandLineOption::ShortOptionStyle);
    parser.addOption(includePathOption);
 
    QCommandLineOption macFrameworkOption(QStringLiteral("F"));
    macFrameworkOption.setDescription(QStringLiteral("Add Mac framework to the include path for header files."));
    macFrameworkOption.setValueName(QStringLiteral("framework"));
    macFrameworkOption.setFlags(QCommandLineOption::ShortOptionStyle);
    parser.addOption(macFrameworkOption);
 
    QCommandLineOption preprocessOption(QStringLiteral("E"));
    preprocessOption.setDescription(QStringLiteral("Preprocess only; do not generate meta object code."));
    parser.addOption(preprocessOption);
 
    QCommandLineOption defineOption(QStringLiteral("D"));
    defineOption.setDescription(QStringLiteral("Define macro, with optional definition."));
    defineOption.setValueName(QStringLiteral("macro[=def]"));
    defineOption.setFlags(QCommandLineOption::ShortOptionStyle);
    parser.addOption(defineOption);
 
    QCommandLineOption undefineOption(QStringLiteral("U"));
    undefineOption.setDescription(QStringLiteral("Undefine macro."));
    undefineOption.setValueName(QStringLiteral("macro"));
    undefineOption.setFlags(QCommandLineOption::ShortOptionStyle);
    parser.addOption(undefineOption);
 
    QCommandLineOption metadataOption(QStringLiteral("M"));
    metadataOption.setDescription(QStringLiteral("Add key/value pair to plugin meta data"));
    metadataOption.setValueName(QStringLiteral("key=value"));
    metadataOption.setFlags(QCommandLineOption::ShortOptionStyle);
    parser.addOption(metadataOption);
 
    QCommandLineOption compilerFlavorOption(QStringLiteral("compiler-flavor"));
    compilerFlavorOption.setDescription(QStringLiteral("Set the compiler flavor: either \"msvc\" or \"unix\"."));
    compilerFlavorOption.setValueName(QStringLiteral("flavor"));
    parser.addOption(compilerFlavorOption);
 
    QCommandLineOption noIncludeOption(QStringLiteral("i"));
    noIncludeOption.setDescription(QStringLiteral("Do not generate an #include statement."));
    parser.addOption(noIncludeOption);
 
    QCommandLineOption pathPrefixOption(QStringLiteral("p"));
    pathPrefixOption.setDescription(QStringLiteral("Path prefix for included file."));
    pathPrefixOption.setValueName(QStringLiteral("path"));
    pathPrefixOption.setFlags(QCommandLineOption::ShortOptionStyle);
    parser.addOption(pathPrefixOption);
 
    QCommandLineOption forceIncludeOption(QStringLiteral("f"));
    forceIncludeOption.setDescription(QStringLiteral("Force #include <file> (overwrite default)."));
    forceIncludeOption.setValueName(QStringLiteral("file"));
    forceIncludeOption.setFlags(QCommandLineOption::ShortOptionStyle);
    parser.addOption(forceIncludeOption);
 
    QCommandLineOption prependIncludeOption(QStringLiteral("b"));
    prependIncludeOption.setDescription(QStringLiteral("Prepend #include <file> (preserve default include)."));
    prependIncludeOption.setValueName(QStringLiteral("file"));
    prependIncludeOption.setFlags(QCommandLineOption::ShortOptionStyle);
    parser.addOption(prependIncludeOption);
 
    QCommandLineOption includeOption(QStringLiteral("include"));
    includeOption.setDescription(QStringLiteral("Parse <file> as an #include before the main source(s)."));
    includeOption.setValueName(QStringLiteral("file"));
    parser.addOption(includeOption);
 
    QCommandLineOption noNotesWarningsCompatOption(QStringLiteral("n"));
    noNotesWarningsCompatOption.setDescription(QStringLiteral("Do not display notes (-nn) or warnings (-nw). Compatibility option."));
    noNotesWarningsCompatOption.setValueName(QStringLiteral("which"));
    noNotesWarningsCompatOption.setFlags(QCommandLineOption::ShortOptionStyle);
    parser.addOption(noNotesWarningsCompatOption);
 
    QCommandLineOption activeQtMode(QStringLiteral("active-qt"));
    activeQtMode.setFlags(QCommandLineOption::HiddenFromHelp);
    parser.addOption(activeQtMode);
 
    QCommandLineOption qmlMacroWarningIsFatal(QStringLiteral("fatal-qml-macro-warning"));
    qmlMacroWarningIsFatal.setFlags(QCommandLineOption::HiddenFromHelp);
    parser.addOption(qmlMacroWarningIsFatal);
 
    QCommandLineOption noNotesOption(QStringLiteral("no-notes"));
    noNotesOption.setDescription(QStringLiteral("Do not display notes."));
    parser.addOption(noNotesOption);
 
    QCommandLineOption noWarningsOption(QStringLiteral("no-warnings"));
    noWarningsOption.setDescription(QStringLiteral("Do not display warnings (implies --no-notes)."));
    parser.addOption(noWarningsOption);
 
    QCommandLineOption ignoreConflictsOption(QStringLiteral("ignore-option-clashes"));
    ignoreConflictsOption.setDescription(QStringLiteral("Ignore all options that conflict with compilers, like -pthread conflicting with moc's -p option."));
    parser.addOption(ignoreConflictsOption);
 
    QCommandLineOption jsonOption(QStringLiteral("output-json"));
    jsonOption.setDescription(QStringLiteral("In addition to generating C++ code, create a machine-readable JSON file in a file that matches the output file and an extra .json extension."));
    parser.addOption(jsonOption);
 
    QCommandLineOption debugIncludesOption(QStringLiteral("debug-includes"));
    debugIncludesOption.setDescription(QStringLiteral("Display debug messages of each considered include path."));
    parser.addOption(debugIncludesOption);
 
    QCommandLineOption collectOption(QStringLiteral("collect-json"));
    collectOption.setDescription(QStringLiteral("Instead of processing C++ code, collect previously generated JSON output into a single file."));
    parser.addOption(collectOption);
 
    QCommandLineOption depFileOption(QStringLiteral("output-dep-file"));
    depFileOption.setDescription(
                QStringLiteral("Output a Make-style dep file for build system consumption."));
    parser.addOption(depFileOption);
 
    QCommandLineOption depFilePathOption(QStringLiteral("dep-file-path"));
    depFilePathOption.setDescription(QStringLiteral("Path where to write the dep file."));
    depFilePathOption.setValueName(QStringLiteral("file"));
    parser.addOption(depFilePathOption);
 
    QCommandLineOption depFileRuleNameOption(QStringLiteral("dep-file-rule-name"));
    depFileRuleNameOption.setDescription(
                QStringLiteral("The rule name (first line) of the dep file."));
    depFileRuleNameOption.setValueName(QStringLiteral("rule name"));
    parser.addOption(depFileRuleNameOption);
 
    QCommandLineOption requireCompleTypesOption(QStringLiteral("require-complete-types"));
    requireCompleTypesOption.setDescription(QStringLiteral("Require complete types for better performance"));
    parser.addOption(requireCompleTypesOption);
 
    parser.addPositionalArgument(QStringLiteral("[header-file]"),
            QStringLiteral("Header file to read from, otherwise stdin."));
    parser.addPositionalArgument(QStringLiteral("[@option-file]"),
            QStringLiteral("Read additional options from option-file."));
    parser.addPositionalArgument(QStringLiteral("[MOC generated json file]"),
                                 QStringLiteral("MOC generated json output"));
 
    bool hasOptionFiles = false;
    const QStringList arguments = argumentsFromCommandLineAndFile(app.arguments(), hasOptionFiles);
    if (arguments.isEmpty())
        return 1;
 
    parser.process(arguments);
 
    // used by ActiveQt's dumpcpp to suppress some functions
    moc.activeQtMode = parser.isSet(activeQtMode);
 
    const QStringList files = parser.positionalArguments();
    output = parser.value(outputOption);
    if (parser.isSet(collectOption))
        return collectJson(files, output, hasOptionFiles);
 
    if (files.size() > 1) {
        error(qPrintable("Too many input files specified: '"_L1 + files.join("' '"_L1) + u'\''));
        parser.showHelp(1);
    } else if (!files.isEmpty()) {
        filename = files.first();
    }
 
    const bool ignoreConflictingOptions = parser.isSet(ignoreConflictsOption);
    pp.preprocessOnly = parser.isSet(preprocessOption);
    pp.setDebugIncludes(parser.isSet(debugIncludesOption));
    if (parser.isSet(noIncludeOption)) {
        moc.noInclude = true;
        autoInclude = false;
    }
    if (parser.isSet(requireCompleTypesOption))
        moc.requireCompleteTypes = true;
    if (!ignoreConflictingOptions) {
        if (parser.isSet(forceIncludeOption)) {
            moc.noInclude = false;
            autoInclude = false;
            const auto forceIncludes = parser.values(forceIncludeOption);
            for (const QString &include : forceIncludes) {
                moc.includeFiles.append(QFile::encodeName(include));
                defaultInclude = false;
             }
        }
        const auto prependIncludes = parser.values(prependIncludeOption);
        for (const QString &include : prependIncludes)
            moc.includeFiles.prepend(QFile::encodeName(include));
        if (parser.isSet(pathPrefixOption))
            moc.includePath = QFile::encodeName(parser.value(pathPrefixOption));
    }
 
    const auto includePaths = parser.values(includePathOption);
    for (const QString &path : includePaths) {
#if defined(Q_OS_APPLE)
        if (path.endsWith(".framework"_L1)) {
            // Treat -I$DIR/QtModule.framework as -F $DIR, to match CMake's AUTOMOC
            // logic, and avoid accidentally treating an umbrella #include <QtModule>
            // as an include of the library binary at $DIR/QtModule.framework/QtModule
            auto frameworkPath = path.sliced(0, path.lastIndexOf(QDir::separator()));
            Preprocessor::IncludePath p(QFile::encodeName(frameworkPath));
            p.isFrameworkPath = true;
            pp.includes += p;
        } else
#endif
        {
            pp.includes += Preprocessor::IncludePath(QFile::encodeName(path));
        }
    }
    QString compilerFlavor = parser.value(compilerFlavorOption);
    if (compilerFlavor.isEmpty() || compilerFlavor == "unix"_L1) {
        // traditional Unix compilers use both CPATH and CPLUS_INCLUDE_PATH
        // $CPATH feeds to #include <...> and #include "...", whereas
        // CPLUS_INCLUDE_PATH is equivalent to GCC's -isystem, so we parse later
        const auto cpath = qgetenv("CPATH").split(QDir::listSeparator().toLatin1());
        for (const QByteArray &p : cpath)
            pp.includes += Preprocessor::IncludePath(p);
        const auto cplus_include_path = qgetenv("CPLUS_INCLUDE_PATH").split(QDir::listSeparator().toLatin1());
        for (const QByteArray &p : cplus_include_path)
            pp.includes += Preprocessor::IncludePath(p);
    } else if (compilerFlavor == "msvc"_L1) {
        // MSVC uses one environment variable: INCLUDE
        const auto include = qgetenv("INCLUDE").split(QDir::listSeparator().toLatin1());
        for (const QByteArray &p : include)
            pp.includes += Preprocessor::IncludePath(p);
    } else {
        error(qPrintable("Unknown compiler flavor '"_L1 + compilerFlavor +
                         "'; valid values are: msvc, unix."_L1));
        parser.showHelp(1);
    }
 
    const auto macFrameworks = parser.values(macFrameworkOption);
    for (const QString &path : macFrameworks) {
        // minimalistic framework support for the mac
        Preprocessor::IncludePath p(QFile::encodeName(path));
        p.isFrameworkPath = true;
        pp.includes += p;
    }
    const auto defines = parser.values(defineOption);
    for (const QString &arg : defines) {
        QByteArray name = arg.toLocal8Bit();
        QByteArray value("1");
        const qsizetype eq = name.indexOf('=');
        if (eq >= 0) {
            value = name.mid(eq + 1);
            name = name.left(eq);
        }
        if (name.isEmpty()) {
            error("Missing macro name");
            parser.showHelp(1);
        }
        Macro macro;
        macro.symbols = Preprocessor::tokenize(value, 1, Preprocessor::TokenizeDefine);
        macro.symbols.removeLast(); // remove the EOF symbol
        pp.macros.insert(name, macro);
    }
    const auto undefines = parser.values(undefineOption);
    for (const QString &arg : undefines) {
        QByteArray macro = arg.toLocal8Bit();
        if (macro.isEmpty()) {
            error("Missing macro name");
            parser.showHelp(1);
        }
        pp.macros.remove(macro);
    }
    const QStringList noNotesCompatValues = parser.values(noNotesWarningsCompatOption);
    if (parser.isSet(noNotesOption) || noNotesCompatValues.contains("n"_L1))
        moc.displayNotes = false;
    if (parser.isSet(noWarningsOption) || noNotesCompatValues.contains("w"_L1))
        moc.displayWarnings = moc.displayNotes = false;
    if (parser.isSet(qmlMacroWarningIsFatal))
        moc.qmlMacroWarningIsFatal = true;
 
    if (autoInclude) {
        qsizetype spos = filename.lastIndexOf(QDir::separator());
        qsizetype ppos = filename.lastIndexOf(u'.');
        // spos >= -1 && ppos > spos => ppos >= 0
        moc.noInclude = (ppos > spos && filename.at(ppos + 1).toLower() != u'h');
    }
    if (defaultInclude) {
        if (moc.includePath.isEmpty()) {
            if (filename.size()) {
                if (output.size())
                    moc.includeFiles.append(combinePath(filename, output));
                else
                    moc.includeFiles.append(QFile::encodeName(filename));
            }
        } else {
            moc.includeFiles.append(combinePath(filename, filename));
        }
    }
 
    if (filename.isEmpty()) {
        filename = QStringLiteral("standard input");
        if (!in.open(stdin, QIODevice::ReadOnly)) {
            fprintf(stderr, "moc: cannot open standard input: %s\n", qPrintable(in.errorString()));
            return 1;
        }
    } else {
        in.setFileName(filename);
        if (!in.open(QIODevice::ReadOnly)) {
            fprintf(stderr, "moc: cannot open %s: %s\n", qPrintable(filename), qPrintable(in.errorString()));
            return 1;
        }
        moc.filename = filename.toLocal8Bit();
    }
 
    const auto metadata = parser.values(metadataOption);
    for (const QString &md : metadata) {
        qsizetype split = md.indexOf(u'=');
        QString key = md.left(split);
        QString value = md.mid(split + 1);
 
        if (split == -1 || key.isEmpty() || value.isEmpty()) {
            error("missing key or value for option '-M'");
        } else if (key.indexOf(u'.') != -1) {
            // Don't allow keys with '.' for now, since we might need this
            // format later for more advanced meta data API
            error("A key cannot contain the letter '.' for option '-M'");
        } else {
            QJsonArray array = moc.metaArgs.value(key);
            array.append(value);
            moc.metaArgs.insert(key, array);
        }
    }
 
    moc.currentFilenames.push(filename.toLocal8Bit());
    moc.includes = pp.includes;
 
    if (Q_UNLIKELY(parser.isSet(debugIncludesOption))) {
        fprintf(stderr, "debug-includes: include search list:\n");
 
        for (auto &includePath : pp.includes) {
            fprintf(stderr, "debug-includes:   '%s' framework: %d \n",
                    includePath.path.constData(),
                    includePath.isFrameworkPath);
        }
        fprintf(stderr, "debug-includes: end of search list.\n");
    }
 
    // 1. preprocess
    const auto includeFiles = parser.values(includeOption);
    QStringList validIncludesFiles;
    for (const QString &includeName : includeFiles) {
        QByteArray rawName = pp.resolveInclude(QFile::encodeName(includeName), moc.filename);
        if (rawName.isEmpty()) {
            fprintf(stderr, "Warning: Failed to resolve include \"%s\" for moc file %s\n",
                    includeName.toLocal8Bit().constData(),
                    moc.filename.isEmpty() ? "<standard input>" : moc.filename.constData());
        } else {
            QFile f(QFile::decodeName(rawName));
            if (f.open(QIODevice::ReadOnly)) {
                moc.symbols += Symbol(0, MOC_INCLUDE_BEGIN, rawName);
                moc.symbols += pp.preprocessed(rawName, &f);
                moc.symbols += Symbol(0, MOC_INCLUDE_END, rawName);
                validIncludesFiles.append(includeName);
            } else {
                fprintf(stderr, "Warning: Cannot open %s included by moc file %s: %s\n",
                        rawName.constData(),
                        moc.filename.isEmpty() ? "<standard input>" : moc.filename.constData(),
                        f.errorString().toLocal8Bit().constData());
            }
        }
    }
    moc.symbols += pp.preprocessed(moc.filename, &in);
 
    if (!pp.preprocessOnly) {
        // 2. parse
        moc.parse();
    }
 
    // 3. and output meta object code
 
    File jsonOutput;
 
    bool outputToFile = true;
    if (output.size()) { // output file specified
        out = openFileForWriting(output);
        if (!out)
        {
            const auto fopen_errno = errno;
            fprintf(stderr, "moc: Cannot create %s. Error: %s\n",
                    QFile::encodeName(output).constData(),
                    strerror(fopen_errno));
            return 1;
        }
 
        if (parser.isSet(jsonOption)) {
            const QString jsonOutputFileName = output + ".json"_L1;
            jsonOutput = openFileForWriting(jsonOutputFileName);
            if (!jsonOutput) {
                const auto fopen_errno = errno;
                fprintf(stderr, "moc: Cannot create JSON output file %s. Error: %s\n",
                        QFile::encodeName(jsonOutputFileName).constData(),
                        strerror(fopen_errno));
            }
        }
    } else { // use stdout
        out.reset(stdout);
        outputToFile = false;
    }
 
    if (pp.preprocessOnly) {
        fprintf(out.get(), "%s\n", composePreprocessorOutput(moc.symbols).constData());
    } else if (moc.classList.isEmpty()) {
        moc.note("No relevant classes found. No output generated.");
        if (jsonOutput) {
            const QJsonDocument jsonDoc(QJsonObject {
                    { "outputRevision"_L1, mocOutputRevision },
                    { "inputFile"_L1, QLatin1StringView(moc.strippedFileName()) }
            });
            fputs(jsonDoc.toJson().constData(), jsonOutput.get());
        }
    } else {
        moc.generate(out.get(), jsonOutput.get());
    }
 
    out.reset();
 
    if (parser.isSet(depFileOption)) {
        // 4. write a Make-style dependency file (can also be consumed by Ninja).
        QString depOutputFileName;
        QString depRuleName = output;
 
        if (parser.isSet(depFileRuleNameOption))
            depRuleName = parser.value(depFileRuleNameOption);
 
        if (parser.isSet(depFilePathOption)) {
            depOutputFileName = parser.value(depFilePathOption);
        } else if (outputToFile) {
            depOutputFileName = output + ".d"_L1;
        } else {
            fprintf(stderr, "moc: Writing to stdout, but no depfile path specified.\n");
        }
 
        File depFileHandle = openFileForWriting(depOutputFileName);
        if (!depFileHandle) {
            const auto fopen_errno = errno;
            fprintf(stderr, "moc: Cannot create dep output file '%s'. Error: %s\n",
                    QFile::encodeName(depOutputFileName).constData(),
                    strerror(fopen_errno));
        }
 
        if (depFileHandle) {
            // First line is the path to the generated file.
            fprintf(depFileHandle.get(), "%s: ",
                    escapeAndEncodeDependencyPath(depRuleName).constData());
 
            QByteArrayList dependencies;
 
            // If there's an input file, it's the first dependency.
            if (!filename.isEmpty()) {
                dependencies.append(escapeAndEncodeDependencyPath(filename).constData());
            }
 
            // Additional passed-in includes are dependencies (like moc_predefs.h).
            for (const QString &includeName : validIncludesFiles) {
                dependencies.append(escapeAndEncodeDependencyPath(includeName).constData());
            }
 
            // Plugin metadata json files discovered via Q_PLUGIN_METADATA macros are also
            // dependencies.
            for (const QString &pluginMetadataFile : moc.parsedPluginMetadataFiles) {
                dependencies.append(escapeAndEncodeDependencyPath(pluginMetadataFile).constData());
            }
 
            // All pre-processed includes are dependnecies.
            // Sort the entries for easier human consumption.
            auto includeList = pp.preprocessedIncludes.values();
            std::sort(includeList.begin(), includeList.end());
 
            for (QByteArray &includeName : includeList) {
                dependencies.append(escapeDependencyPath(includeName));
            }
 
            // Join dependencies, output them, and output a final new line.
            const auto dependenciesJoined = dependencies.join(QByteArrayLiteral(" \\\n  "));
            fprintf(depFileHandle.get(), "%s\n", dependenciesJoined.constData());
        }
    }
 
    return 0;
}
 
QT_END_NAMESPACE
 
int main(int _argc, char **_argv)
{
    return QT_PREPEND_NAMESPACE(runMoc)(_argc, _argv);
}