/** {@inheritDoc} */
 public String getDocComment() {
   // Our doc comment is contained in a map in our toplevel,
   // indexed by our tree.  Find our enter environment, which gives
   // us our toplevel.  It also gives us a tree that contains our
   // tree:  walk it to find our tree.  This is painful.
   Env<AttrContext> enterEnv = getEnterEnv();
   if (enterEnv == null) return null;
   JCTree tree = TreeInfo.declarationFor(sym, enterEnv.tree);
   return enterEnv.toplevel.docComments.get(tree);
 }
  /** {@inheritDoc} */
  public SourcePosition getPosition() {
    // Find the toplevel.  From there use a tree-walking utility
    // that finds the tree for our symbol, and with it the position.
    Env<AttrContext> enterEnv = getEnterEnv();
    if (enterEnv == null) return null;
    JCTree.JCCompilationUnit toplevel = enterEnv.toplevel;
    JavaFileObject sourcefile = toplevel.sourcefile;
    if (sourcefile == null) return null;
    int pos = TreeInfo.positionFor(sym, toplevel);

    return new SourcePositionImpl(sourcefile, pos, toplevel.lineMap);
  }
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  public void visitTopLevel(JCCompilationUnit tree) {
    JavaFileObject prev = log.useSource(tree.sourcefile);
    boolean addEnv = false;
    boolean isPkgInfo =
        tree.sourcefile.isNameCompatible("package-info", JavaFileObject.Kind.SOURCE);
    if (tree.pid != null) {
      tree.packge = reader.enterPackage(TreeInfo.fullName(tree.pid));
      if (tree.packageAnnotations.nonEmpty()) {
        if (isPkgInfo) {
          addEnv = true;
        } else {
          log.error(tree.packageAnnotations.head.pos(), "pkg.annotations.sb.in.package-info.java");
        }
      }
    } else {
      tree.packge = syms.unnamedPackage;
    }
    tree.packge.complete(); // Find all classes in package.
    Env<AttrContext> env = topLevelEnv(tree);

    // Save environment of package-info.java file.
    if (isPkgInfo) {
      Env<AttrContext> env0 = typeEnvs.get(tree.packge);
      if (env0 == null) {
        typeEnvs.put(tree.packge, env);
      } else {
        JCCompilationUnit tree0 = env0.toplevel;
        if (!fileManager.isSameFile(tree.sourcefile, tree0.sourcefile)) {
          log.warning(
              tree.pid != null ? tree.pid.pos() : null, "pkg-info.already.seen", tree.packge);
          if (addEnv
              || (tree0.packageAnnotations.isEmpty()
                  && tree.docComments != null
                  && tree.docComments.get(tree) != null)) {
            typeEnvs.put(tree.packge, env);
          }
        }
      }
    }
    classEnter(tree.defs, env);
    if (addEnv) {
      todo.append(env);
    }
    log.useSource(prev);
    result = null;
  }