content: /*
   * Copyright (c) 2003, 2021, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package openjdk.tools.javac.comp;
  
  import openjdk.tools.javac.code.*;
  import openjdk.tools.javac.code.Attribute.Compound;
  import openjdk.tools.javac.code.Attribute.TypeCompound;
  import openjdk.tools.javac.code.Kinds.KindSelector;
  import openjdk.tools.javac.code.Scope.WriteableScope;
  import openjdk.tools.javac.code.Source.Feature;
  import openjdk.tools.javac.code.Symbol.*;
  import openjdk.tools.javac.code.TypeMetadata.Entry.Kind;
  import openjdk.tools.javac.comp.Check.CheckContext;
  import openjdk.tools.javac.resources.CompilerProperties.Errors;
  import openjdk.tools.javac.resources.CompilerProperties.Fragments;
  import openjdk.tools.javac.tree.JCTree;
  import openjdk.tools.javac.tree.JCTree.*;
  import openjdk.tools.javac.tree.TreeInfo;
  import openjdk.tools.javac.tree.TreeMaker;
  import openjdk.tools.javac.tree.TreeScanner;
  import openjdk.tools.javac.util.*;
  import openjdk.tools.javac.util.JCDiagnostic.DiagnosticPosition;
  import openjdk.tools.javac.util.List;
  
  import jdkx.tools.JavaFileObject;
  
  import java.util.*;
  
  import static openjdk.tools.javac.code.Flags.SYNTHETIC;
  import static openjdk.tools.javac.code.Kinds.Kind.MDL;
  import static openjdk.tools.javac.code.Kinds.Kind.MTH;
  import static openjdk.tools.javac.code.Kinds.Kind.PCK;
  import static openjdk.tools.javac.code.Kinds.Kind.TYP;
  import static openjdk.tools.javac.code.Kinds.Kind.VAR;
  import static openjdk.tools.javac.code.Scope.LookupKind.NON_RECURSIVE;
  import static openjdk.tools.javac.code.TypeTag.ARRAY;
  import static openjdk.tools.javac.code.TypeTag.CLASS;
  import static openjdk.tools.javac.tree.JCTree.Tag.ANNOTATION;
  import static openjdk.tools.javac.tree.JCTree.Tag.ASSIGN;
  import static openjdk.tools.javac.tree.JCTree.Tag.IDENT;
  import static openjdk.tools.javac.tree.JCTree.Tag.NEWARRAY;
  
  import openjdk.tools.javac.util.JCDiagnostic.DiagnosticFlag;
  
  
  /** Enter annotations onto symbols and types (and trees).
   *
   *  This is also a pseudo stage in the compiler taking care of scheduling when annotations are
   *  entered.
   *
   *  <p><b>This is NOT part of any supported API.
   *  If you write code that depends on this, you do so at your own risk.
   *  This code and its internal interfaces are subject to change or
   *  deletion without notice.</b>
   */
  public class Annotate {
      protected static final Context.Key<Annotate> annotateKey = new Context.Key<>();
  
      public static Annotate instance(Context context) {
          Annotate instance = context.get(annotateKey);
          if (instance == null)
              instance = new Annotate(context);
          return instance;
      }
  
      private final Attr attr;
      private final Check chk;
      private final ConstFold cfolder;
      private final DeferredLintHandler deferredLintHandler;
      private final Enter enter;
      private final Lint lint;
      private final Log log;
      private final Names names;
      private final Resolve resolve;
      private final TreeMaker make;
      private final Symtab syms;
      private final TypeEnvs typeEnvs;
      private final Types types;
  
      private final Attribute theUnfinishedDefaultValue;
      private final boolean allowRepeatedAnnos;
      private final String sourceName;
  
      protected Annotate(Context context) {
          context.put(annotateKey, this);
  
          attr = Attr.instance(context);
          chk = Check.instance(context);
          cfolder = ConstFold.instance(context);
          deferredLintHandler = DeferredLintHandler.instance(context);
          enter = Enter.instance(context);
          log = Log.instance(context);
          lint = Lint.instance(context);
          make = TreeMaker.instance(context);
          names = Names.instance(context);
          resolve = Resolve.instance(context);
          syms = Symtab.instance(context);
          typeEnvs = TypeEnvs.instance(context);
          types = Types.instance(context);
  
          theUnfinishedDefaultValue =  new Attribute.Error(syms.errType);
  
          Source source = Source.instance(context);
          allowRepeatedAnnos = Feature.REPEATED_ANNOTATIONS.allowedInSource(source);
          sourceName = source.name;
  
          blockCount = 1;
      }
  
      /** Semaphore to delay annotation processing */
      private int blockCount = 0;
  
      /** Called when annotations processing needs to be postponed. */
      public void blockAnnotations() {
          blockCount++;
      }
  
      /** Called when annotation processing can be resumed. */
      public void unblockAnnotations() {
          blockCount--;
          if (blockCount == 0)
              flush();
      }
  
      /** Variant which allows for a delayed flush of annotations.
       * Needed by ClassReader */
      public void unblockAnnotationsNoFlush() {
          blockCount--;
      }
  
      /** are we blocking annotation processing? */
      public boolean annotationsBlocked() {return blockCount > 0; }
  
      public void enterDone() {
          unblockAnnotations();
      }
  
      public List<TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
          if (annotations.isEmpty()) {
              return List.nil();
          }
  
          ListBuffer<TypeCompound> buf = new ListBuffer<>();
          for (JCAnnotation anno : annotations) {
              Assert.checkNonNull(anno.attribute);
              buf.append((TypeCompound) anno.attribute);
          }
          return buf.toList();
      }
  
      /** Annotate (used for everything else) */
      public void normal(Runnable r) {
          q.append(r);
      }
  
      /** Validate, triggers after 'normal' */
      public void validate(Runnable a) {
          validateQ.append(a);
      }
  
      /** Flush all annotation queues */
      public void flush() {
          if (annotationsBlocked()) return;
          if (isFlushing()) return;
  
          startFlushing();
          try {
              while (q.nonEmpty()) {
                  q.next().run();
              }
              while (typesQ.nonEmpty()) {
                  typesQ.next().run();
              }
              while (afterTypesQ.nonEmpty()) {
                  afterTypesQ.next().run();
              }
              while (validateQ.nonEmpty()) {
                  validateQ.next().run();
              }
          } finally {
              doneFlushing();
          }
      }
  
      private ListBuffer<Runnable> q = new ListBuffer<>();
      private ListBuffer<Runnable> validateQ = new ListBuffer<>();
  
      private int flushCount = 0;
      public boolean isFlushing() { return flushCount > 0; }
      private void startFlushing() { flushCount++; }
      private void doneFlushing() { flushCount--; }
  
      ListBuffer<Runnable> typesQ = new ListBuffer<>();
      ListBuffer<Runnable> afterTypesQ = new ListBuffer<>();
  
  
      public void typeAnnotation(Runnable a) {
          typesQ.append(a);
      }
  
      public void afterTypes(Runnable a) {
          afterTypesQ.append(a);
      }
  
      /**
       * Queue annotations for later attribution and entering. This is probably the method you are looking for.
       *
       * @param annotations the list of JCAnnotations to attribute and enter
       * @param localEnv    the enclosing env
       * @param s           ths Symbol on which to enter the annotations
       * @param deferPos    report errors here
       */
      public void annotateLater(List<JCAnnotation> annotations, Env<AttrContext> localEnv,
              Symbol s, DiagnosticPosition deferPos)
      {
          if (annotations.isEmpty()) {
              return;
          }
  
          s.resetAnnotations(); // mark Annotations as incomplete for now
  
          normal(() -> {
              // Packages are unusual, in that they are the only type of declaration that can legally appear
              // more than once in a compilation, and in all cases refer to the same underlying symbol.
              // This means they are the only kind of declaration that syntactically may have multiple sets
              // of annotations, each on a different package declaration, even though that is ultimately
              // forbidden by JLS 8 section 7.4.
              // The corollary here is that all of the annotations on a package symbol may have already
              // been handled, meaning that the set of annotations pending completion is now empty.
              Assert.check(s.kind == PCK || s.annotationsPendingCompletion());
              JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
              DiagnosticPosition prevLintPos =
                      deferPos != null
                              ? deferredLintHandler.setPos(deferPos)
                              : deferredLintHandler.immediate();
              Lint prevLint = deferPos != null ? null : chk.setLint(lint);
              try {
                  if (s.hasAnnotations() && annotations.nonEmpty())
                      log.error(annotations.head.pos, Errors.AlreadyAnnotated(Kinds.kindName(s), s));
  
                  Assert.checkNonNull(s, "Symbol argument to actualEnterAnnotations is null");
  
                  // false is passed as fifth parameter since annotateLater is
                  // never called for a type parameter
                  annotateNow(s, annotations, localEnv, false, false);
              } finally {
                  if (prevLint != null)
                      chk.setLint(prevLint);
                  deferredLintHandler.setPos(prevLintPos);
                  log.useSource(prev);
              }
          });
  
          validate(() -> { //validate annotations
              JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
              try {
                  chk.validateAnnotations(annotations, TreeInfo.declarationFor(s, localEnv.tree), s);
              } finally {
                  log.useSource(prev);
              }
          });
      }
  
  
      /** Queue processing of an attribute default value. */
      public void annotateDefaultValueLater(JCExpression defaultValue, Env<AttrContext> localEnv,
              MethodSymbol m, DiagnosticPosition deferPos)
      {
          normal(() -> {
              JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
              DiagnosticPosition prevLintPos = deferredLintHandler.setPos(deferPos);
              try {
                  enterDefaultValue(defaultValue, localEnv, m);
              } finally {
                  deferredLintHandler.setPos(prevLintPos);
                  log.useSource(prev);
              }
          });
  
          validate(() -> { //validate annotations
              JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
              try {
                  // if default value is an annotation, check it is a well-formed
                  // annotation value (e.g. no duplicate values, no missing values, etc.)
                  chk.validateAnnotationTree(defaultValue);
              } finally {
                  log.useSource(prev);
              }
          });
      }
  
      /** Enter a default value for an annotation element. */
      private void enterDefaultValue(JCExpression defaultValue,
              Env<AttrContext> localEnv, MethodSymbol m) {
          m.defaultValue = attributeAnnotationValue(m.type.getReturnType(), defaultValue, localEnv);
      }
  
      /**
       * Gather up annotations into a map from type symbols to lists of Compound attributes,
       * then continue on with repeating annotations processing.
       */
      private <T extends Attribute.Compound> void annotateNow(Symbol toAnnotate,
              List<JCAnnotation> withAnnotations, Env<AttrContext> env, boolean typeAnnotations,
              boolean isTypeParam)
      {
          Map<TypeSymbol, ListBuffer<T>> annotated = new LinkedHashMap<>();
          Map<T, DiagnosticPosition> pos = new HashMap<>();
  
          for (List<JCAnnotation> al = withAnnotations; !al.isEmpty(); al = al.tail) {
              JCAnnotation a = al.head;
  
              T c;
              if (typeAnnotations) {
                  @SuppressWarnings("unchecked")
                  T tmp = (T)attributeTypeAnnotation(a, syms.annotationType, env);
                  c = tmp;
              } else {
                  @SuppressWarnings("unchecked")
                  T tmp = (T)attributeAnnotation(a, syms.annotationType, env);
                  c = tmp;
              }
  
              Assert.checkNonNull(c, "Failed to create annotation");
  
              if (a.type.tsym.isAnnotationType()) {
                  if (annotated.containsKey(a.type.tsym)) {
                      if (!allowRepeatedAnnos) {
                          log.error(DiagnosticFlag.SOURCE_LEVEL, a.pos(), Feature.REPEATED_ANNOTATIONS.error(sourceName));
                      }
                      ListBuffer<T> l = annotated.get(a.type.tsym);
                      l = l.append(c);
                      annotated.put(a.type.tsym, l);
                      pos.put(c, a.pos());
                  } else {
                      annotated.put(a.type.tsym, ListBuffer.of(c));
                      pos.put(c, a.pos());
                  }
              }
  
              // Note: @Deprecated has no effect on local variables and parameters
              if (!c.type.isErroneous()
                      && (toAnnotate.kind == MDL || toAnnotate.owner.kind != MTH)
                      && types.isSameType(c.type, syms.deprecatedType)) {
                  toAnnotate.flags_field |= (Flags.DEPRECATED | Flags.DEPRECATED_ANNOTATION);
                  if (isAttributeTrue(c.member(names.forRemoval))) {
                      toAnnotate.flags_field |= Flags.DEPRECATED_REMOVAL;
                  }
              }
  
              if (!c.type.isErroneous()
                      && types.isSameType(c.type, syms.previewFeatureType)) {
                  toAnnotate.flags_field |= Flags.PREVIEW_API;
                  if (isAttributeTrue(c.member(names.reflective))) {
                      toAnnotate.flags_field |= Flags.PREVIEW_REFLECTIVE;
                  }
              }
  
              if (!c.type.isErroneous()
                      && toAnnotate.kind == TYP
                      && types.isSameType(c.type, syms.valueBasedType)) {
                  toAnnotate.flags_field |= Flags.VALUE_BASED;
              }
          }
  
          List<T> buf = List.nil();
          for (ListBuffer<T> lb : annotated.values()) {
              if (lb.size() == 1) {
                  buf = buf.prepend(lb.first());
              } else {
                  AnnotationContext<T> ctx = new AnnotationContext<>(env, annotated, pos, typeAnnotations);
                  T res = makeContainerAnnotation(lb.toList(), ctx, toAnnotate, isTypeParam);
                  if (res != null)
                      buf = buf.prepend(res);
              }
          }
  
          if (typeAnnotations) {
              @SuppressWarnings("unchecked")
              List<TypeCompound> attrs = (List<TypeCompound>)buf.reverse();
              toAnnotate.appendUniqueTypeAttributes(attrs);
          } else {
              @SuppressWarnings("unchecked")
              List<Attribute.Compound> attrs =  (List<Attribute.Compound>)buf.reverse();
              toAnnotate.resetAnnotations();
              toAnnotate.setDeclarationAttributes(attrs);
          }
      }
      //where:
          private boolean isAttributeTrue(Attribute attr) {
               if (attr instanceof Attribute.Constant) {
                  Attribute.Constant v = (Attribute.Constant) attr;
                  if (v.type == syms.booleanType && ((Integer) v.value) != 0) {
                      return true;
                  }
              }
              return false;
          }
  
      /**
       * Attribute and store a semantic representation of the annotation tree {@code tree} into the
       * tree.attribute field.
       *
       * @param tree the tree representing an annotation
       * @param expectedAnnotationType the expected (super)type of the annotation
       * @param env the current env in where the annotation instance is found
       */
      public Attribute.Compound attributeAnnotation(JCAnnotation tree, Type expectedAnnotationType,
                                                    Env<AttrContext> env)
      {
          // The attribute might have been entered if it is Target or Repeatable
          // Because TreeCopier does not copy type, redo this if type is null
          if (tree.attribute != null && tree.type != null)
              return tree.attribute;
  
          List<Pair<MethodSymbol, Attribute>> elems = attributeAnnotationValues(tree, expectedAnnotationType, env);
          Attribute.Compound ac = new Attribute.Compound(tree.type, elems);
  
          return tree.attribute = ac;
      }
  
      /** Attribute and store a semantic representation of the type annotation tree {@code tree} into
       * the tree.attribute field.
       *
       * @param a the tree representing an annotation
       * @param expectedAnnotationType the expected (super)type of the annotation
       * @param env the the current env in where the annotation instance is found
       */
      public Attribute.TypeCompound attributeTypeAnnotation(JCAnnotation a, Type expectedAnnotationType,
                                                            Env<AttrContext> env)
      {
          // The attribute might have been entered if it is Target or Repeatable
          // Because TreeCopier does not copy type, redo this if type is null
         if (a.attribute == null || a.type == null || !(a.attribute instanceof Attribute.TypeCompound)) {
              // Create a new TypeCompound
              List<Pair<MethodSymbol,Attribute>> elems =
                      attributeAnnotationValues(a, expectedAnnotationType, env);
  
              Attribute.TypeCompound tc =
                      new Attribute.TypeCompound(a.type, elems, TypeAnnotationPosition.unknown);
              a.attribute = tc;
              return tc;
          } else {
              // Use an existing TypeCompound
              return (Attribute.TypeCompound)a.attribute;
          }
      }
  
      /**
       *  Attribute annotation elements creating a list of pairs of the Symbol representing that
       *  element and the value of that element as an Attribute. */
      private List<Pair<MethodSymbol, Attribute>> attributeAnnotationValues(JCAnnotation a,
              Type expected, Env<AttrContext> env)
      {
          // The annotation might have had its type attributed (but not
          // checked) by attr.attribAnnotationTypes during MemberEnter,
          // in which case we do not need to do it again.
          Type at = (a.annotationType.type != null ?
                  a.annotationType.type : attr.attribType(a.annotationType, env));
          a.type = chk.checkType(a.annotationType.pos(), at, expected);
  
          boolean isError = a.type.isErroneous();
          if (!a.type.tsym.isAnnotationType() && !isError) {
              log.error(a.annotationType.pos(), Errors.NotAnnotationType(a.type));
              isError = true;
          }
  
          // List of name=value pairs (or implicit "value=" if size 1)
          List<JCExpression> args = a.args;
  
          boolean elidedValue = false;
          // special case: elided "value=" assumed
          if (args.length() == 1) {
              if (!args.head.hasTag(ASSIGN)) {
                  args.head = make.at(Position.NOPOS).
                          Assign(make.Ident(names.value), args.head);
                  elidedValue = true;
              } else if (args.head.pos == Position.NOPOS) {
                  elidedValue = true;
              }
          }
  
          ListBuffer<Pair<MethodSymbol,Attribute>> buf = new ListBuffer<>();
          for (List<JCExpression> tl = args; tl.nonEmpty(); tl = tl.tail) {
              Pair<MethodSymbol, Attribute> p = attributeAnnotationNameValuePair(tl.head, a.type, isError, env, elidedValue);
              if (p != null && !p.fst.type.isErroneous())
                  buf.append(p);
          }
          return buf.toList();
      }
  
      // where
      private Pair<MethodSymbol, Attribute> attributeAnnotationNameValuePair(JCExpression nameValuePair,
              Type thisAnnotationType, boolean badAnnotation, Env<AttrContext> env, boolean elidedValue)
      {
          if (!nameValuePair.hasTag(ASSIGN)) {
              log.error(nameValuePair.pos(), Errors.AnnotationValueMustBeNameValue);
              attributeAnnotationValue(nameValuePair.type = syms.errType, nameValuePair, env);
              return null;
          }
          JCAssign assign = (JCAssign)nameValuePair;
          if (!assign.lhs.hasTag(IDENT)) {
              log.error(nameValuePair.pos(), Errors.AnnotationValueMustBeNameValue);
              attributeAnnotationValue(nameValuePair.type = syms.errType, nameValuePair, env);
              return null;
          }
  
          // Resolve element to MethodSym
          JCIdent left = (JCIdent)assign.lhs;
          Symbol method = resolve.resolveQualifiedMethod(elidedValue ? assign.rhs.pos() : left.pos(),
                  env, thisAnnotationType,
                  left.name, List.nil(), null);
          left.sym = method;
          left.type = method.type;
          if (method.owner != thisAnnotationType.tsym && !badAnnotation)
              log.error(left.pos(), Errors.NoAnnotationMember(left.name, thisAnnotationType));
          Type resultType = method.type.getReturnType();
  
          // Compute value part
          Attribute value = attributeAnnotationValue(resultType, assign.rhs, env);
          nameValuePair.type = resultType;
  
          return method.type.isErroneous() ? null : new Pair<>((MethodSymbol)method, value);
  
      }
  
      /** Attribute an annotation element value */
      private Attribute attributeAnnotationValue(Type expectedElementType, JCExpression tree,
              Env<AttrContext> env)
      {
          //first, try completing the symbol for the annotation value - if a completion
          //error is thrown, we should recover gracefully, and display an
          //ordinary resolution diagnostic.
          try {
              expectedElementType.tsym.complete();
          } catch(CompletionFailure e) {
              log.error(tree.pos(), Errors.CantResolve(Kinds.kindName(e.sym), e.sym.getQualifiedName(), null, null));
              expectedElementType = syms.errType;
          }
  
          if (expectedElementType.hasTag(ARRAY)) {
              return getAnnotationArrayValue(expectedElementType, tree, env);
  
          }
  
          //error recovery
          if (tree.hasTag(NEWARRAY)) {
              if (!expectedElementType.isErroneous())
                  log.error(tree.pos(), Errors.AnnotationValueNotAllowableType);
              JCNewArray na = (JCNewArray)tree;
              if (na.elemtype != null) {
                  log.error(na.elemtype.pos(), Errors.NewNotAllowedInAnnotation);
              }
              for (List<JCExpression> l = na.elems; l.nonEmpty(); l=l.tail) {
                  attributeAnnotationValue(syms.errType,
                          l.head,
                          env);
              }
              return new Attribute.Error(syms.errType);
          }
  
          if (expectedElementType.tsym.isAnnotationType()) {
              if (tree.hasTag(ANNOTATION)) {
                  return attributeAnnotation((JCAnnotation)tree, expectedElementType, env);
              } else {
                  log.error(tree.pos(), Errors.AnnotationValueMustBeAnnotation);
                  expectedElementType = syms.errType;
              }
          }
  
          //error recovery
          if (tree.hasTag(ANNOTATION)) {
              if (!expectedElementType.isErroneous())
                  log.error(tree.pos(), Errors.AnnotationNotValidForType(expectedElementType));
              attributeAnnotation((JCAnnotation)tree, syms.errType, env);
              return new Attribute.Error(((JCAnnotation)tree).annotationType.type);
          }
  
          MemberEnter.InitTreeVisitor initTreeVisitor = new MemberEnter.InitTreeVisitor() {
              // the methods below are added to allow class literals on top of constant expressions
              @Override
              public void visitTypeIdent(JCPrimitiveTypeTree that) {}
  
              @Override
              public void visitTypeArray(JCArrayTypeTree that) {}
          };
          tree.accept(initTreeVisitor);
          if (!initTreeVisitor.result) {
              log.error(tree.pos(), Errors.ExpressionNotAllowableAsAnnotationValue);
              return new Attribute.Error(syms.errType);
          }
  
          if (expectedElementType.isPrimitive() ||
                  (types.isSameType(expectedElementType, syms.stringType) && !expectedElementType.hasTag(TypeTag.ERROR))) {
              return getAnnotationPrimitiveValue(expectedElementType, tree, env);
          }
  
          if (expectedElementType.tsym == syms.classType.tsym) {
              return getAnnotationClassValue(expectedElementType, tree, env);
          }
  
          if (expectedElementType.hasTag(CLASS) &&
                  (expectedElementType.tsym.flags() & Flags.ENUM) != 0) {
              return getAnnotationEnumValue(expectedElementType, tree, env);
          }
  
          //error recovery:
          if (!expectedElementType.isErroneous())
              log.error(tree.pos(), Errors.AnnotationValueNotAllowableType);
          return new Attribute.Error(attr.attribExpr(tree, env, expectedElementType));
      }
  
      private Attribute getAnnotationEnumValue(Type expectedElementType, JCExpression tree, Env<AttrContext> env) {
          Type result = attr.attribTree(tree, env, annotationValueInfo(expectedElementType));
          Symbol sym = TreeInfo.symbol(tree);
          if (sym == null ||
                  TreeInfo.nonstaticSelect(tree) ||
                  sym.kind != VAR ||
                  (sym.flags() & Flags.ENUM) == 0) {
              log.error(tree.pos(), Errors.EnumAnnotationMustBeEnumConstant);
              return new Attribute.Error(result.getOriginalType());
          }
          VarSymbol enumerator = (VarSymbol) sym;
          return new Attribute.Enum(expectedElementType, enumerator);
      }
  
      private Attribute getAnnotationClassValue(Type expectedElementType, JCExpression tree, Env<AttrContext> env) {
          Type result = attr.attribTree(tree, env, annotationValueInfo(expectedElementType));
          if (result.isErroneous()) {
              // Does it look like an unresolved class literal?
              if (TreeInfo.name(tree) == names._class &&
                      ((JCFieldAccess) tree).selected.type.isErroneous()) {
                  Name n = (((JCFieldAccess) tree).selected).type.tsym.flatName();
                  return new Attribute.UnresolvedClass(expectedElementType,
                          types.createErrorType(n,
                                  syms.unknownSymbol, syms.classType));
              } else {
                  return new Attribute.Error(result.getOriginalType());
              }
          }
  
          // Class literals look like field accesses of a field named class
          // at the tree level
          if (TreeInfo.name(tree) != names._class) {
              log.error(tree.pos(), Errors.AnnotationValueMustBeClassLiteral);
              return new Attribute.Error(syms.errType);
          }
  
          return new Attribute.Class(types,
                  (((JCFieldAccess) tree).selected).type);
      }
  
      private Attribute getAnnotationPrimitiveValue(Type expectedElementType, JCExpression tree, Env<AttrContext> env) {
          Type result = attr.attribTree(tree, env, annotationValueInfo(expectedElementType));
          if (result.isErroneous())
              return new Attribute.Error(result.getOriginalType());
          if (result.constValue() == null) {
              log.error(tree.pos(), Errors.AttributeValueMustBeConstant);
              return new Attribute.Error(expectedElementType);
          }
          result = cfolder.coerce(result, expectedElementType);
          return new Attribute.Constant(expectedElementType, result.constValue());
      }
  
      private Attr.ResultInfo annotationValueInfo(Type pt) {
          return attr.unknownExprInfo.dup(pt, new AnnotationValueContext(attr.unknownExprInfo.checkContext));
      }
  
      class AnnotationValueContext extends Check.NestedCheckContext {
          AnnotationValueContext(CheckContext enclosingContext) {
              super(enclosingContext);
          }
  
          @Override
          public boolean compatible(Type found, Type req, Warner warn) {
              //handle non-final implicitly-typed vars (will be rejected later on)
              return found.hasTag(TypeTag.NONE) || super.compatible(found, req, warn);
          }
      }
  
      private Attribute getAnnotationArrayValue(Type expectedElementType, JCExpression tree, Env<AttrContext> env) {
          // Special case, implicit array
          if (!tree.hasTag(NEWARRAY)) {
              tree = make.at(tree.pos).
                      NewArray(null, List.nil(), List.of(tree));
          }
  
          JCNewArray na = (JCNewArray)tree;
          if (na.elemtype != null) {
              log.error(na.elemtype.pos(), Errors.NewNotAllowedInAnnotation);
          }
          ListBuffer<Attribute> buf = new ListBuffer<>();
          if (na.elems != null) {
              for (List<JCExpression> l = na.elems; l.nonEmpty(); l=l.tail) {
                  buf.append(attributeAnnotationValue(types.elemtype(expectedElementType),
                          l.head,
                          env));
              }
          }
          na.type = expectedElementType;
          return new Attribute.
                  Array(expectedElementType, buf.toArray(new Attribute[buf.length()]));
      }
  
      /* *********************************
       * Support for repeating annotations
       ***********************************/
  
      /**
       * This context contains all the information needed to synthesize new
       * annotations trees for repeating annotations.
       */
      private class AnnotationContext<T extends Attribute.Compound> {
          public final Env<AttrContext> env;
          public final Map<Symbol.TypeSymbol, ListBuffer<T>> annotated;
          public final Map<T, JCDiagnostic.DiagnosticPosition> pos;
          public final boolean isTypeCompound;
  
          public AnnotationContext(Env<AttrContext> env,
                                   Map<Symbol.TypeSymbol, ListBuffer<T>> annotated,
                                   Map<T, JCDiagnostic.DiagnosticPosition> pos,
                                   boolean isTypeCompound) {
              Assert.checkNonNull(env);
              Assert.checkNonNull(annotated);
              Assert.checkNonNull(pos);
  
              this.env = env;
              this.annotated = annotated;
              this.pos = pos;
              this.isTypeCompound = isTypeCompound;
          }
      }
  
      /* Process repeated annotations. This method returns the
       * synthesized container annotation or null IFF all repeating
       * annotation are invalid.  This method reports errors/warnings.
       */
      private <T extends Attribute.Compound> T processRepeatedAnnotations(List<T> annotations,
              AnnotationContext<T> ctx, Symbol on, boolean isTypeParam)
      {
          T firstOccurrence = annotations.head;
          List<Attribute> repeated = List.nil();
          Type origAnnoType = null;
          Type arrayOfOrigAnnoType = null;
          Type targetContainerType = null;
          MethodSymbol containerValueSymbol = null;
  
          Assert.check(!annotations.isEmpty() && !annotations.tail.isEmpty()); // i.e. size() > 1
  
          int count = 0;
          for (List<T> al = annotations; !al.isEmpty(); al = al.tail) {
              count++;
  
              // There must be more than a single anno in the annotation list
              Assert.check(count > 1 || !al.tail.isEmpty());
  
              T currentAnno = al.head;
  
              origAnnoType = currentAnno.type;
              if (arrayOfOrigAnnoType == null) {
                  arrayOfOrigAnnoType = types.makeArrayType(origAnnoType);
              }
  
              // Only report errors if this isn't the first occurrence I.E. count > 1
              boolean reportError = count > 1;
              Type currentContainerType = getContainingType(currentAnno, ctx.pos.get(currentAnno), reportError);
              if (currentContainerType == null) {
                  continue;
              }
              // Assert that the target Container is == for all repeated
              // annos of the same annotation type, the types should
              // come from the same Symbol, i.e. be '=='
              Assert.check(targetContainerType == null || currentContainerType == targetContainerType);
              targetContainerType = currentContainerType;
  
              containerValueSymbol = validateContainer(targetContainerType, origAnnoType, ctx.pos.get(currentAnno));
  
              if (containerValueSymbol == null) { // Check of CA type failed
                  // errors are already reported
                  continue;
              }
  
              repeated = repeated.prepend(currentAnno);
          }
  
          if (!repeated.isEmpty() && targetContainerType == null) {
              log.error(ctx.pos.get(annotations.head), Errors.DuplicateAnnotationInvalidRepeated(origAnnoType));
              return null;
          }
  
          if (!repeated.isEmpty()) {
              repeated = repeated.reverse();
              DiagnosticPosition pos = ctx.pos.get(firstOccurrence);
              TreeMaker m = make.at(pos);
              Pair<MethodSymbol, Attribute> p =
                      new Pair<MethodSymbol, Attribute>(containerValueSymbol,
                              new Attribute.Array(arrayOfOrigAnnoType, repeated));
              if (ctx.isTypeCompound) {
                  /* TODO: the following code would be cleaner:
                  Attribute.TypeCompound at = new Attribute.TypeCompound(targetContainerType, List.of(p),
                          ((Attribute.TypeCompound)annotations.head).position);
                  JCTypeAnnotation annoTree = m.TypeAnnotation(at);
                  at = attributeTypeAnnotation(annoTree, targetContainerType, ctx.env);
                  */
                  // However, we directly construct the TypeCompound to keep the
                  // direct relation to the contained TypeCompounds.
                  Attribute.TypeCompound at = new Attribute.TypeCompound(targetContainerType, List.of(p),
                          ((Attribute.TypeCompound)annotations.head).position);
  
                  JCAnnotation annoTree = m.TypeAnnotation(at);
                  if (!chk.validateAnnotationDeferErrors(annoTree))
                      log.error(annoTree.pos(), Errors.DuplicateAnnotationInvalidRepeated(origAnnoType));
  
                  if (!chk.isTypeAnnotation(annoTree, isTypeParam)) {
                      log.error(pos, isTypeParam ? Errors.InvalidRepeatableAnnotationNotApplicable(targetContainerType, on)
                                                 : Errors.InvalidRepeatableAnnotationNotApplicableInContext(targetContainerType));
                  }
  
                  at.setSynthesized(true);
  
                  @SuppressWarnings("unchecked")
                  T x = (T) at;
                  return x;
              } else {
                  Attribute.Compound c = new Attribute.Compound(targetContainerType, List.of(p));
                  JCAnnotation annoTree = m.Annotation(c);
  
                  boolean isRecordMember = (on.flags_field & Flags.RECORD) != 0 || on.enclClass() != null && on.enclClass().isRecord();
                  /* if it is a record member we will not issue the error now and wait until annotations on records are
                   * checked at Check::validateAnnotation, which will issue it
                   */
                  if (!chk.annotationApplicable(annoTree, on) && (!isRecordMember || isRecordMember && (on.flags_field & Flags.GENERATED_MEMBER) == 0)) {
                      log.error(annoTree.pos(),
                                Errors.InvalidRepeatableAnnotationNotApplicable(targetContainerType, on));
                  }
  
                  if (!chk.validateAnnotationDeferErrors(annoTree))
                      log.error(annoTree.pos(), Errors.DuplicateAnnotationInvalidRepeated(origAnnoType));
  
                  c = attributeAnnotation(annoTree, targetContainerType, ctx.env);
                  c.setSynthesized(true);
  
                  @SuppressWarnings("unchecked")
                  T x = (T) c;
                  return x;
              }
          } else {
              return null; // errors should have been reported elsewhere
          }
      }
  
      /**
       * Fetches the actual Type that should be the containing annotation.
       */
      private Type getContainingType(Attribute.Compound currentAnno,
                                     DiagnosticPosition pos,
                                     boolean reportError)
      {
          Type origAnnoType = currentAnno.type;
          TypeSymbol origAnnoDecl = origAnnoType.tsym;
  
          // Fetch the Repeatable annotation from the current
          // annotation's declaration, or null if it has none
          Attribute.Compound ca = origAnnoDecl.getAnnotationTypeMetadata().getRepeatable();
          if (ca == null) { // has no Repeatable annotation
              if (reportError)
                  log.error(pos, Errors.DuplicateAnnotationMissingContainer(origAnnoType));
              return null;
          }
  
          return filterSame(extractContainingType(ca, pos, origAnnoDecl),
                  origAnnoType);
      }
  
      // returns null if t is same as 's', returns 't' otherwise
      private Type filterSame(Type t, Type s) {
          if (t == null || s == null) {
              return t;
          }
  
          return types.isSameType(t, s) ? null : t;
      }
  
      /** Extract the actual Type to be used for a containing annotation. */
      private Type extractContainingType(Attribute.Compound ca,
                                         DiagnosticPosition pos,
                                         TypeSymbol annoDecl)
      {
          // The next three checks check that the Repeatable annotation
          // on the declaration of the annotation type that is repeating is
          // valid.
  
          // Repeatable must have at least one element
          if (ca.values.isEmpty()) {
              log.error(pos, Errors.InvalidRepeatableAnnotation(annoDecl));
              return null;
          }
          Pair<MethodSymbol,Attribute> p = ca.values.head;
          Name name = p.fst.name;
          if (name != names.value) { // should contain only one element, named "value"
              log.error(pos, Errors.InvalidRepeatableAnnotation(annoDecl));
              return null;
          }
          if (!(p.snd instanceof Attribute.Class)) { // check that the value of "value" is an Attribute.Class
              log.error(pos, Errors.InvalidRepeatableAnnotation(annoDecl));
              return null;
          }
  
          return ((Attribute.Class)p.snd).getValue();
      }
  
      /* Validate that the suggested targetContainerType Type is a valid
       * container type for repeated instances of originalAnnoType
       * annotations. Return null and report errors if this is not the
       * case, return the MethodSymbol of the value element in
       * targetContainerType if it is suitable (this is needed to
       * synthesize the container). */
      private MethodSymbol validateContainer(Type targetContainerType,
                                             Type originalAnnoType,
                                             DiagnosticPosition pos) {
          MethodSymbol containerValueSymbol = null;
          boolean fatalError = false;
  
          // Validate that there is a (and only 1) value method
          Scope scope = targetContainerType.tsym.members();
          int nr_value_elems = 0;
          boolean error = false;
          for(Symbol elm : scope.getSymbolsByName(names.value)) {
              nr_value_elems++;
  
              if (nr_value_elems == 1 &&
                      elm.kind == MTH) {
                  containerValueSymbol = (MethodSymbol)elm;
              } else {
                  error = true;
              }
          }
          if (error) {
              log.error(pos,
                        Errors.InvalidRepeatableAnnotationMultipleValues(targetContainerType,
                                                                         nr_value_elems));
              return null;
          } else if (nr_value_elems == 0) {
              log.error(pos,
                        Errors.InvalidRepeatableAnnotationNoValue(targetContainerType));
              return null;
          }
  
          // validate that the 'value' element is a method
          // probably "impossible" to fail this
          if (containerValueSymbol.kind != MTH) {
              log.error(pos,
                      Errors.InvalidRepeatableAnnotationInvalidValue(targetContainerType));
              fatalError = true;
          }
  
          // validate that the 'value' element has the correct return type
          // i.e. array of original anno
          Type valueRetType = containerValueSymbol.type.getReturnType();
          Type expectedType = types.makeArrayType(originalAnnoType);
          if (!(types.isArray(valueRetType) &&
                  types.isSameType(expectedType, valueRetType))) {
              log.error(pos,
                        Errors.InvalidRepeatableAnnotationValueReturn(targetContainerType,
                                                                      valueRetType,
                                                                      expectedType));
              fatalError = true;
          }
  
          return fatalError ? null : containerValueSymbol;
      }
  
      private <T extends Attribute.Compound> T makeContainerAnnotation(List<T> toBeReplaced,
              AnnotationContext<T> ctx, Symbol sym, boolean isTypeParam)
      {
          // Process repeated annotations
          T validRepeated =
                  processRepeatedAnnotations(toBeReplaced, ctx, sym, isTypeParam);
  
          if (validRepeated != null) {
              // Check that the container isn't manually
              // present along with repeated instances of
              // its contained annotation.
              ListBuffer<T> manualContainer = ctx.annotated.get(validRepeated.type.tsym);
              if (manualContainer != null) {
                  log.error(ctx.pos.get(manualContainer.first()),
                            Errors.InvalidRepeatableAnnotationRepeatedAndContainerPresent(manualContainer.first().type.tsym));
              }
          }
  
          // A null return will delete the Placeholder
          return validRepeated;
      }
  
      /********************
       * Type annotations *
       ********************/
  
      /**
       * Attribute the list of annotations and enter them onto s.
       */
      public void enterTypeAnnotations(List<JCAnnotation> annotations, Env<AttrContext> env,
              Symbol s, DiagnosticPosition deferPos, boolean isTypeParam)
      {
          Assert.checkNonNull(s, "Symbol argument to actualEnterTypeAnnotations is nul/");
          JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
          DiagnosticPosition prevLintPos = null;
  
          if (deferPos != null) {
              prevLintPos = deferredLintHandler.setPos(deferPos);
          }
          try {
              annotateNow(s, annotations, env, true, isTypeParam);
          } finally {
              if (prevLintPos != null)
                  deferredLintHandler.setPos(prevLintPos);
              log.useSource(prev);
          }
      }
  
      /**
       * Enqueue tree for scanning of type annotations, attaching to the Symbol sym.
       */
      public void queueScanTreeAndTypeAnnotate(JCTree tree, Env<AttrContext> env, Symbol sym,
              DiagnosticPosition deferPos)
      {
          Assert.checkNonNull(sym);
          normal(() -> tree.accept(new TypeAnnotate(env, sym, deferPos)));
      }
  
      /**
       * Apply the annotations to the particular type.
       */
      public void annotateTypeSecondStage(JCTree tree, List<JCAnnotation> annotations, Type storeAt) {
          typeAnnotation(() -> {
              List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
              Assert.check(annotations.size() == compounds.size());
              storeAt.getMetadataOfKind(Kind.ANNOTATIONS).combine(new TypeMetadata.Annotations(compounds));
          });
      }
  
      /**
       * Apply the annotations to the particular type.
       */
      public void annotateTypeParameterSecondStage(JCTree tree, List<JCAnnotation> annotations) {
          typeAnnotation(() -> {
              List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
              Assert.check(annotations.size() == compounds.size());
          });
      }
  
      /**
       * We need to use a TreeScanner, because it is not enough to visit the top-level
       * annotations. We also need to visit type arguments, etc.
       */
      private class TypeAnnotate extends TreeScanner {
          private final Env<AttrContext> env;
          private final Symbol sym;
          private DiagnosticPosition deferPos;
  
          public TypeAnnotate(Env<AttrContext> env, Symbol sym, DiagnosticPosition deferPos) {
  
              this.env = env;
              this.sym = sym;
              this.deferPos = deferPos;
          }
  
          @Override
          public void visitAnnotatedType(JCAnnotatedType tree) {
              enterTypeAnnotations(tree.annotations, env, sym, deferPos, false);
              scan(tree.underlyingType);
          }
  
          @Override
          public void visitTypeParameter(JCTypeParameter tree) {
              enterTypeAnnotations(tree.annotations, env, sym, deferPos, true);
              scan(tree.bounds);
          }
  
          @Override
          public void visitNewArray(JCNewArray tree) {
              enterTypeAnnotations(tree.annotations, env, sym, deferPos, false);
              for (List<JCAnnotation> dimAnnos : tree.dimAnnotations)
                  enterTypeAnnotations(dimAnnos, env, sym, deferPos, false);
              scan(tree.elemtype);
              scan(tree.elems);
          }
  
          @Override
          public void visitMethodDef(JCMethodDecl tree) {
              scan(tree.mods);
              scan(tree.restype);
              scan(tree.typarams);
              scan(tree.recvparam);
              scan(tree.params);
              scan(tree.thrown);
              scan(tree.defaultValue);
              // Do not annotate the body, just the signature.
          }
  
          @Override
          public void visitVarDef(JCVariableDecl tree) {
              DiagnosticPosition prevPos = deferPos;
              deferPos = tree.pos();
              try {
                  if (sym != null && sym.kind == VAR) {
                      // Don't visit a parameter once when the sym is the method
                      // and once when the sym is the parameter.
                      scan(tree.mods);
                      scan(tree.vartype);
                  }
                  scan(tree.init);
              } finally {
                  deferPos = prevPos;
              }
          }
  
          @Override
          public void visitBindingPattern(JCTree.JCBindingPattern tree) {
              //type binding pattern's type will be annotated separately, avoid
              //adding its annotations into the owning method here (would clash
              //with repeatable annotations).
          }
  
          @Override
          public void visitClassDef(JCClassDecl tree) {
              // We can only hit a classdef if it is declared within
              // a method. Ignore it - the class will be visited
              // separately later.
          }
  
          @Override
          public void visitNewClass(JCNewClass tree) {
              scan(tree.encl);
              scan(tree.typeargs);
              if (tree.def == null) {
                  scan(tree.clazz);
              }
              scan(tree.args);
              // the anonymous class instantiation if any will be visited separately.
          }
  
          @Override
          public void visitErroneous(JCErroneous tree) {
              scan(tree.errs);
          }
      }
  
      /*********************
       * Completer support *
       *********************/
  
      private AnnotationTypeCompleter theSourceCompleter = new AnnotationTypeCompleter() {
          @Override
          public void complete(ClassSymbol sym) throws CompletionFailure {
              Env<AttrContext> context = typeEnvs.get(sym);
              Annotate.this.attributeAnnotationType(context);
          }
      };
  
      /* Last stage completer to enter just enough annotations to have a prototype annotation type.
       * This currently means entering @Target and @Repeatable.
       */
      public AnnotationTypeCompleter annotationTypeSourceCompleter() {
          return theSourceCompleter;
      }
  
      private void attributeAnnotationType(Env<AttrContext> env) {
          Assert.check(((JCClassDecl)env.tree).sym.isAnnotationType(),
                  "Trying to annotation type complete a non-annotation type");
  
          JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
          try {
              JCClassDecl tree = (JCClassDecl)env.tree;
              AnnotationTypeVisitor v = new AnnotationTypeVisitor(attr, chk, syms, typeEnvs);
              v.scanAnnotationType(tree);
              tree.sym.getAnnotationTypeMetadata().setRepeatable(v.repeatable);
              tree.sym.getAnnotationTypeMetadata().setTarget(v.target);
          } finally {
              log.useSource(prev);
          }
      }
  
      public Attribute unfinishedDefaultValue() {
          return theUnfinishedDefaultValue;
      }
  
      public static interface AnnotationTypeCompleter {
          void complete(ClassSymbol sym) throws CompletionFailure;
      }
  
      /** Visitor to determine a prototype annotation type for a class declaring an annotation type.
       *
       *  <p><b>This is NOT part of any supported API.
       *  If you write code that depends on this, you do so at your own risk.
       *  This code and its internal interfaces are subject to change or
       *  deletion without notice.</b>
       */
      public class AnnotationTypeVisitor extends TreeScanner {
          private Env<AttrContext> env;
  
          private final Attr attr;
          private final Check check;
          private final Symtab tab;
          private final TypeEnvs typeEnvs;
  
          private Compound target;
          private Compound repeatable;
  
          public AnnotationTypeVisitor(Attr attr, Check check, Symtab tab, TypeEnvs typeEnvs) {
              this.attr = attr;
              this.check = check;
              this.tab = tab;
              this.typeEnvs = typeEnvs;
          }
  
          public Compound getRepeatable() {
              return repeatable;
          }
  
          public Compound getTarget() {
              return target;
          }
  
          public void scanAnnotationType(JCClassDecl decl) {
              visitClassDef(decl);
          }
  
          @Override
          public void visitClassDef(JCClassDecl tree) {
              Env<AttrContext> prevEnv = env;
              env = typeEnvs.get(tree.sym);
              try {
                  scan(tree.mods); // look for repeatable and target
                  // don't descend into body
              } finally {
                  env = prevEnv;
              }
          }
  
          @Override
          public void visitAnnotation(JCAnnotation tree) {
              Type t = tree.annotationType.type;
              if (t == null) {
                  t = attr.attribType(tree.annotationType, env);
                  tree.annotationType.type = t = check.checkType(tree.annotationType.pos(), t, tab.annotationType);
              }
  
              if (t == tab.annotationTargetType) {
                  target = Annotate.this.attributeAnnotation(tree, tab.annotationTargetType, env);
              } else if (t == tab.repeatableType) {
                  repeatable = Annotate.this.attributeAnnotation(tree, tab.repeatableType, env);
              }
          }
  
          @Override
          public void visitErroneous(JCErroneous tree) {
              scan(tree.errs);
          }
      }
  
      /** Represents the semantics of an Annotation Type.
       *
       *  <p><b>This is NOT part of any supported API.
       *  If you write code that depends on this, you do so at your own risk.
       *  This code and its internal interfaces are subject to change or
       *  deletion without notice.</b>
       */
      public static class AnnotationTypeMetadata {
          final ClassSymbol metaDataFor;
          private Compound target;
          private Compound repeatable;
          private AnnotationTypeCompleter annotationTypeCompleter;
  
          public AnnotationTypeMetadata(ClassSymbol metaDataFor, AnnotationTypeCompleter annotationTypeCompleter) {
              this.metaDataFor = metaDataFor;
              this.annotationTypeCompleter = annotationTypeCompleter;
          }
  
          private void init() {
              // Make sure metaDataFor is member entered
              while (!metaDataFor.isCompleted())
                  metaDataFor.complete();
  
              if (annotationTypeCompleter != null) {
                  AnnotationTypeCompleter c = annotationTypeCompleter;
                  annotationTypeCompleter = null;
                  c.complete(metaDataFor);
              }
          }
  
          public void complete() {
              init();
          }
  
          public Compound getRepeatable() {
              init();
              return repeatable;
          }
  
          public void setRepeatable(Compound repeatable) {
              Assert.checkNull(this.repeatable);
              this.repeatable = repeatable;
          }
  
          public Compound getTarget() {
              init();
              return target;
          }
  
          public void setTarget(Compound target) {
              Assert.checkNull(this.target);
                  this.target = target;
          }
  
          public Set<MethodSymbol> getAnnotationElements() {
              init();
              Set<MethodSymbol> members = new LinkedHashSet<>();
              WriteableScope s = metaDataFor.members();
              Iterable<Symbol> ss = s.getSymbols(NON_RECURSIVE);
              for (Symbol sym : ss)
                  if (sym.kind == MTH &&
                          sym.name != sym.name.table.names.clinit &&
                          (sym.flags() & SYNTHETIC) == 0)
                      members.add((MethodSymbol)sym);
              return members;
          }
  
          public Set<MethodSymbol> getAnnotationElementsWithDefault() {
              init();
              Set<MethodSymbol> members = getAnnotationElements();
              Set<MethodSymbol> res = new LinkedHashSet<>();
              for (MethodSymbol m : members)
                  if (m.defaultValue != null)
                      res.add(m);
              return res;
          }
  
          @Override
          public String toString() {
              return "Annotation type for: " + metaDataFor;
          }
  
          public boolean isMetadataForAnnotationType() { return true; }
  
          public static AnnotationTypeMetadata notAnAnnotationType() {
              return NOT_AN_ANNOTATION_TYPE;
          }
  
          private static final AnnotationTypeMetadata NOT_AN_ANNOTATION_TYPE =
                  new AnnotationTypeMetadata(null, null) {
                      @Override
                      public void complete() {
                      } // do nothing
  
                      @Override
                      public String toString() {
                          return "Not an annotation type";
                      }
  
                      @Override
                      public Set<MethodSymbol> getAnnotationElements() {
                          return new LinkedHashSet<>(0);
                      }
  
                      @Override
                      public Set<MethodSymbol> getAnnotationElementsWithDefault() {
                          return new LinkedHashSet<>(0);
                      }
  
                      @Override
                      public boolean isMetadataForAnnotationType() {
                          return false;
                      }
  
                      @Override
                      public Compound getTarget() {
                          return null;
                      }
  
                      @Override
                      public Compound getRepeatable() {
                          return null;
                      }
                  };
      }
  
      public void newRound() {
          blockCount = 1;
      }
  
      public Queues setQueues(Queues nue) {
          Queues stored = new Queues(q, validateQ, typesQ, afterTypesQ);
          this.q = nue.q;
          this.typesQ = nue.typesQ;
          this.afterTypesQ = nue.afterTypesQ;
          this.validateQ = nue.validateQ;
          return stored;
      }
  
      static class Queues {
          private final ListBuffer<Runnable> q;
          private final ListBuffer<Runnable> validateQ;
          private final ListBuffer<Runnable> typesQ;
          private final ListBuffer<Runnable> afterTypesQ;
  
          public Queues() {
              this(new ListBuffer<Runnable>(), new ListBuffer<Runnable>(), new ListBuffer<Runnable>(), new ListBuffer<Runnable>());
          }
  
          public Queues(ListBuffer<Runnable> q, ListBuffer<Runnable> validateQ, ListBuffer<Runnable> typesQ, ListBuffer<Runnable> afterTypesQ) {
              this.q = q;
              this.validateQ = validateQ;
              this.typesQ = typesQ;
              this.afterTypesQ = afterTypesQ;
          }
      }
  }
  