Java Code Examples for com.sun.tools.javac.main.JavaCompiler#instance()

static void test(JavacFileManager fm, JavaFileObject f, String... args) throws Throwable {
    Context context = new Context();
    fm.setContext(context);

    Main compilerMain = new Main("javac", new PrintWriter(System.err, true));
    compilerMain.setOptions(Options.instance(context));
    compilerMain.filenames = new LinkedHashSet<File>();
    compilerMain.processArgs(args);

    JavaCompiler c = JavaCompiler.instance(context);

    c.compile(List.of(f));

    if (c.errorCount() != 0)
        throw new AssertionError("compilation failed");

    long msec = c.elapsed_msec;
    if (msec < 0 || msec > 5 * 60 * 1000) // allow test 5 mins to execute, should be more than enough!
        throw new AssertionError("elapsed time is suspect: " + msec);
}
 

static void testNoAnnotationProcessing(JavacFileManager fm, JavaFileObject f) throws Throwable {
    Context context = new Context();
    fm.setContext(context);

    Main compilerMain = new Main("javac", new PrintWriter(System.err, true));
    compilerMain.setOptions(Options.instance(context));
    compilerMain.filenames = new LinkedHashSet<File>();
    compilerMain.processArgs(new String[] { "-d", "." });

    JavaCompiler compiler = JavaCompiler.instance(context);
    compiler.compile(List.of(f));
    try {
        compiler.compile(List.of(f));
        throw new Error("Error: AssertionError not thrown after second call of compile");
    } catch (AssertionError e) {
        System.err.println("Exception from compiler (expected): " + e);
    }
}
 

/** Create a round (common code). */
private Round(Context context, int number, int priorErrors, int priorWarnings,
        Log.DeferredDiagnosticHandler deferredDiagnosticHandler) {
    this.context = context;
    this.number = number;

    compiler = JavaCompiler.instance(context);
    log = Log.instance(context);
    log.nerrors = priorErrors;
    log.nwarnings = priorWarnings;
    if (number == 1) {
        Assert.checkNonNull(deferredDiagnosticHandler);
        this.deferredDiagnosticHandler = deferredDiagnosticHandler;
    } else {
        this.deferredDiagnosticHandler = new Log.DeferredDiagnosticHandler(log);
    }

    // the following is for the benefit of JavacProcessingEnvironment.getContext()
    JavacProcessingEnvironment.this.context = context;

    // the following will be populated as needed
    topLevelClasses  = List.nil();
    packageInfoFiles = List.nil();
}
 

static void testAnnotationProcessing(JavacFileManager fm, JavaFileObject f) throws Throwable {
    Context context = new Context();
    fm.setContext(context);

    Main compilerMain = new Main("javac", new PrintWriter(System.err, true));
    compilerMain.setOptions(Options.instance(context));
    compilerMain.filenames = new LinkedHashSet<File>();
    compilerMain.processArgs(new String[] {
                                 "-XprintRounds",
                                 "-processorpath", testClasses,
                                 "-processor", self,
                                 "-d", "."});

    JavaCompiler compiler = JavaCompiler.instance(context);
    compiler.initProcessAnnotations(null);
    JavaCompiler compiler2 = compiler.processAnnotations(compiler.enterTrees(compiler.parseFiles(List.of(f))));
    try {
        compiler2.compile(List.of(f));
        throw new Error("Error: AssertionError not thrown after second call of compile");
    } catch (AssertionError e) {
        System.err.println("Exception from compiler (expected): " + e);
    }
}
 

static void testNoAnnotationProcessing(JavacFileManager fm, JavaFileObject f) throws Throwable {
    Context context = new Context();
    fm.setContext(context);

    Main compilerMain = new Main("javac", new PrintWriter(System.err, true));
    compilerMain.setOptions(Options.instance(context));
    compilerMain.filenames = new LinkedHashSet<File>();
    compilerMain.processArgs(new String[] { "-d", "." });

    JavaCompiler compiler = JavaCompiler.instance(context);
    compiler.compile(List.of(f));
    try {
        compiler.compile(List.of(f));
        throw new Error("Error: AssertionError not thrown after second call of compile");
    } catch (AssertionError e) {
        System.err.println("Exception from compiler (expected): " + e);
    }
}
 

static void testAnnotationProcessing(JavacFileManager fm, JavaFileObject f) throws Throwable {
    Context context = new Context();
    fm.setContext(context);

    Main compilerMain = new Main("javac", new PrintWriter(System.err, true));
    compilerMain.setOptions(Options.instance(context));
    compilerMain.filenames = new LinkedHashSet<File>();
    compilerMain.processArgs(new String[] {
                                 "-XprintRounds",
                                 "-processorpath", testClasses,
                                 "-processor", self,
                                 "-d", "."});

    JavaCompiler compiler = JavaCompiler.instance(context);
    compiler.initProcessAnnotations(null);
    JavaCompiler compiler2 = compiler.processAnnotations(compiler.enterTrees(compiler.parseFiles(List.of(f))));
    try {
        compiler2.compile(List.of(f));
        throw new Error("Error: AssertionError not thrown after second call of compile");
    } catch (AssertionError e) {
        System.err.println("Exception from compiler (expected): " + e);
    }
}
 

/**
 * For internal use only.  This method will be
 * removed without warning.
 */
public Type parseType(String expr, TypeElement scope) {
    if (expr == null || expr.equals(""))
        throw new IllegalArgumentException();
    compiler = JavaCompiler.instance(context);
    JavaFileObject prev = compiler.log.useSource(null);
    ParserFactory parserFactory = ParserFactory.instance(context);
    Attr attr = Attr.instance(context);
    try {
        CharBuffer buf = CharBuffer.wrap((expr+"\u0000").toCharArray(), 0, expr.length());
        Parser parser = parserFactory.newParser(buf, false, false, false);
        JCTree tree = parser.parseType();
        return attr.attribType(tree, (TypeSymbol)scope);
    } finally {
        compiler.log.useSource(prev);
    }
}
 

/**
 * For internal use only.  This method will be
 * removed without warning.
 * @param expr the type expression to be analyzed
 * @param scope the scope in which to analyze the type expression
 * @return the type
 * @throws IllegalArgumentException if the type expression of null or empty
 */
public Type parseType(String expr, TypeElement scope) {
    if (expr == null || expr.equals(""))
        throw new IllegalArgumentException();
    compiler = JavaCompiler.instance(context);
    JavaFileObject prev = compiler.log.useSource(null);
    ParserFactory parserFactory = ParserFactory.instance(context);
    Attr attr = Attr.instance(context);
    try {
        CharBuffer buf = CharBuffer.wrap((expr+"\u0000").toCharArray(), 0, expr.length());
        Parser parser = parserFactory.newParser(buf, false, false, false);
        JCTree tree = parser.parseType();
        return attr.attribType(tree, (Symbol.TypeSymbol)scope);
    } finally {
        compiler.log.useSource(prev);
    }
}
 

/**
 * For internal use only.  This method will be
 * removed without warning.
 */
public Type parseType(String expr, TypeElement scope) {
    if (expr == null || expr.equals(""))
        throw new IllegalArgumentException();
    compiler = JavaCompiler.instance(context);
    JavaFileObject prev = compiler.log.useSource(null);
    ParserFactory parserFactory = ParserFactory.instance(context);
    Attr attr = Attr.instance(context);
    try {
        CharBuffer buf = CharBuffer.wrap((expr+"\u0000").toCharArray(), 0, expr.length());
        Parser parser = parserFactory.newParser(buf, false, false, false);
        JCTree tree = parser.parseType();
        return attr.attribType(tree, (TypeSymbol)scope);
    } finally {
        compiler.log.useSource(prev);
    }
}
 

private void initProcessorClassLoader() {
    JavaFileManager fileManager = context.get(JavaFileManager.class);
    try {
        // If processorpath is not explicitly set, use the classpath.
        processorClassLoader = fileManager.hasLocation(ANNOTATION_PROCESSOR_PATH)
            ? fileManager.getClassLoader(ANNOTATION_PROCESSOR_PATH)
            : fileManager.getClassLoader(CLASS_PATH);

        if (processorClassLoader != null && processorClassLoader instanceof Closeable) {
            JavaCompiler compiler = JavaCompiler.instance(context);
            compiler.closeables = compiler.closeables.prepend((Closeable) processorClassLoader);
        }
    } catch (SecurityException e) {
        processorClassLoaderException = e;
    }
}
 

/**
     * Setup a compilation context, used for reading public apis of classes on the classpath
     * as well as annotation processors.
     */
    public PubApiExtractor(Options options) {
        JavacTool compiler = com.sun.tools.javac.api.JavacTool.create();
        fileManager = new SmartFileManager(compiler.getStandardFileManager(null, null, null));
        context = new com.sun.tools.javac.util.Context();
        String[] args = options.prepJavacArgs();
        task = compiler.getTask(new PrintWriter(System.err),
                                fileManager,
                                null,
                                Arrays.asList(args),
                                null,
                                null,
                                context);
        // Trigger a creation of the JavaCompiler, necessary to get a sourceCompleter for ClassFinder.
        // The sourceCompleter is used for build situations where a classpath class references other classes
        // that happens to be on the sourcepath.
        JavaCompiler.instance(context);

//        context.put(JavaFileManager.class, fileManager);
    }
 

/**
 * Use a new context.  May be called from outside to update
 * internal state for a new annotation-processing round.
 */
public void setContext(Context context) {
    context.put(JavacElements.class, this);
    javaCompiler = JavaCompiler.instance(context);
    syms = Symtab.instance(context);
    names = Names.instance(context);
    types = Types.instance(context);
    enter = Enter.instance(context);
}
 

@Override
public final void init(ProcessingEnvironment env) {
    super.init(env);
    JavacTask.instance(env).addTaskListener(listener);
    Context ctx = ((JavacProcessingEnvironment)processingEnv).getContext();
    JavaCompiler compiler = JavaCompiler.instance(ctx);
    compiler.shouldStopPolicyIfNoError = CompileState.max(
            compiler.shouldStopPolicyIfNoError,
            CompileState.FLOW);
}
 

@Override
public final void init(ProcessingEnvironment env) {
    super.init(env);
    JavacTask.instance(env).addTaskListener(listener);
    Context ctx = ((JavacProcessingEnvironment)processingEnv).getContext();
    JavaCompiler compiler = JavaCompiler.instance(ctx);
    compiler.shouldStopPolicyIfNoError = CompileState.max(
            compiler.shouldStopPolicyIfNoError,
            CompileState.FLOW);
}
 

public static void main(String[] args) throws IOException {
    javax.tools.JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
    JavacTaskImpl task = (JavacTaskImpl)tool.getTask(null, null, null, null, null, null);
    JavaCompiler compiler = JavaCompiler.instance(task.getContext());
    Symtab syms = Symtab.instance(task.getContext());
    task.ensureEntered();
    System.out.println(compiler.resolveIdent(syms.unnamedModule, getDeprecatedClass().getCanonicalName()));
}
 

private void prepareCompiler(boolean forParse) {
    if (used.getAndSet(true)) {
        if (compiler == null)
            throw new PropagatedException(new IllegalStateException());
    } else {
        args.validate();

        //initialize compiler's default locale
        context.put(Locale.class, locale);

        // hack
        JavacMessages messages = context.get(JavacMessages.messagesKey);
        if (messages != null && !messages.getCurrentLocale().equals(locale))
            messages.setCurrentLocale(locale);

        initPlugins(args.getPluginOpts());

        // init JavaCompiler and queues
        compiler = JavaCompiler.instance(context);
        compiler.keepComments = true;
        compiler.genEndPos = true;
        notYetEntered = new HashMap<>();
        if (forParse) {
            compiler.initProcessAnnotations(processors, args.getFileObjects(), args.getClassNames());
            for (JavaFileObject file: args.getFileObjects())
                notYetEntered.put(file, null);
            genList = new ListBuffer<>();
        }
    }
}
 

/**
 * Creates the table to manage included and excluded elements.
 *
 * @param context the context to locate commonly used objects
 * @param location the location used to locate source files
 */
ElementsTable(Context context, Map<ToolOption, Object> opts) {
    this.toolEnv = ToolEnvironment.instance(context);
    this.syms = Symtab.instance(context);
    this.names = Names.instance(context);
    this.fm = toolEnv.fileManager;
    this.modules = Modules.instance(context);
    this.opts = opts;
    this.messager = Messager.instance0(context);
    this.compiler = JavaCompiler.instance(context);
    Source source = Source.instance(context);

    List<Location> locs = new ArrayList<>();
    if (modules.multiModuleMode) {
        locs.add(StandardLocation.MODULE_SOURCE_PATH);
    } else {
        if (toolEnv.fileManager.hasLocation(StandardLocation.SOURCE_PATH))
            locs.add(StandardLocation.SOURCE_PATH);
        else
            locs.add(StandardLocation.CLASS_PATH);
    }
    if (source.allowModules() && toolEnv.fileManager.hasLocation(StandardLocation.PATCH_MODULE_PATH))
        locs.add(StandardLocation.PATCH_MODULE_PATH);
    this.locations = Collections.unmodifiableList(locs);

    getEntry("").excluded = false;

    accessFilter = new ModifierFilter(opts);
    xclasses = (boolean)opts.getOrDefault(ToolOption.XCLASSES, false);
    expandRequires = (AccessKind)opts.get(ToolOption.EXPAND_REQUIRES);
}
 

void run() throws Exception {
        Context c = new Context();
        JavacFileManager.preRegister(c);
        Symtab syms = Symtab.instance(c);
        JavacTypes types = JavacTypes.instance(c);
        JavaCompiler.instance(c);  // will init ClassReader.sourceCompleter

//        print("noSymbol", syms.noSymbol);
//        print("errSymbol", syms.errSymbol);
//        print("unknownSymbol", syms.unknownSymbol);
//        print("botType", syms.botType);
//        print("errType", syms.errType);
//        print("unknownType", syms.unknownType);

        for (Field f: Symtab.class.getDeclaredFields()) {
//            System.err.println(f.getType() + " " + f.getName());

            // Temporarily ignore methodHandle and transientMethodHandle
            // during API evolution
            if (f.getName().toLowerCase().contains("methodhandle"))
                continue;

            Class<?> ft = f.getType();
            if (TypeMirror.class.isAssignableFrom(ft))
                print(f.getName(), (TypeMirror) f.get(syms), types);
            else if(Element.class.isAssignableFrom(ft))
                print(f.getName(), (Element) f.get(syms));
        }

        if (errors > 0)
            throw new Exception(errors + " errors occurred");
    }
 

@Override
public final void init(ProcessingEnvironment env) {
    super.init(env);
    JavacTask.instance(env).addTaskListener(listener);
    Context ctx = ((JavacProcessingEnvironment)processingEnv).getContext();
    JavaCompiler compiler = JavaCompiler.instance(ctx);
    compiler.shouldStopPolicyIfNoError = CompileState.max(compiler.shouldStopPolicyIfNoError,
            CompileState.FLOW);
}
 

void compileRemainingTypes_ByTypeNameRegexes()
{
  if( _enterGuard )
  {
    return;
  }
  _enterGuard = true;

  Map<String, String> others = JavacPlugin.instance().getOtherSourceMappings();
  Map<ITypeManifold, Set<String>> classToRegex = new HashMap<>();
  for( Map.Entry<String, String> entry: others.entrySet() )
  {
    mapTypeManifoldToTypeNameRegexes( classToRegex, entry.getKey(), entry.getValue() );
  }

  IModule module = JavacPlugin.instance().getHost().getSingleModule();
  Context ctx = JavacPlugin.instance().getContext();
  for( Map.Entry<ITypeManifold, Set<String>> mapping: classToRegex.entrySet() )
  {
    ITypeManifold tm = mapping.getKey();
    Collection<String> types = computeNamesToPrecompile( tm.getAllTypeNames(), mapping.getValue() );
    if( types.isEmpty() )
    {
      //todo: add compile error
      continue;
    }

    // signal the type manifold for post Java compilation
    tm.enterPostJavaCompilation();

    // Cause the types to compile by entering ClassSymbols into javac's "todos"
    if( !enterClassSymbols( module, ctx, types ) )
    {
      return;
    }
  }

  JavaCompiler javaCompiler = JavaCompiler.instance( ctx );
  if( !javaCompiler.todo.isEmpty() )
  {
    // compile resource types we just loaded
    compileTodo( javaCompiler );
  }

  _enterGuard = false;
}