langtools/src/jdk.javadoc/share/classes/com/sun/tools/javadoc/main/DocEnv.java
changeset 37938 42baa89d2156
parent 36526 3b41f1c69604
child 38617 d93a7f64e231
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/jdk.javadoc/share/classes/com/sun/tools/javadoc/main/DocEnv.java	Mon May 09 16:52:15 2016 -0700
@@ -0,0 +1,869 @@
+/*
+ * Copyright (c) 2000, 2015, 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 com.sun.tools.javadoc.main;
+
+import java.lang.reflect.Modifier;
+import java.util.*;
+
+import javax.tools.JavaFileManager;
+
+import com.sun.javadoc.*;
+import com.sun.source.tree.CompilationUnitTree;
+import com.sun.source.util.JavacTask;
+import com.sun.source.util.TreePath;
+import com.sun.tools.doclint.DocLint;
+import com.sun.tools.javac.api.BasicJavacTask;
+import com.sun.tools.javac.code.*;
+import com.sun.tools.javac.code.Symbol.*;
+import com.sun.tools.javac.code.Symbol.ClassSymbol;
+import com.sun.tools.javac.code.Symbol.CompletionFailure;
+import com.sun.tools.javac.code.Symbol.MethodSymbol;
+import com.sun.tools.javac.code.Symbol.PackageSymbol;
+import com.sun.tools.javac.code.Symbol.VarSymbol;
+import com.sun.tools.javac.code.Type.ClassType;
+import com.sun.tools.javac.comp.Check;
+import com.sun.tools.javac.comp.Enter;
+import com.sun.tools.javac.file.JavacFileManager;
+import com.sun.tools.javac.tree.JCTree;
+import com.sun.tools.javac.tree.JCTree.JCClassDecl;
+import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
+import com.sun.tools.javac.tree.JCTree.JCPackageDecl;
+import com.sun.tools.javac.util.Context;
+import com.sun.tools.javac.util.Convert;
+import com.sun.tools.javac.util.Name;
+import com.sun.tools.javac.util.Names;
+
+/**
+ * Holds the environment for a run of javadoc.
+ * Holds only the information needed throughout the
+ * run and not the compiler info that could be GC'ed
+ * or ported.
+ *
+ *  <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>
+ *
+ * @since 1.4
+ * @author Robert Field
+ * @author Neal Gafter (rewrite)
+ * @author Scott Seligman (generics)
+ */
+public class DocEnv {
+    protected static final Context.Key<DocEnv> docEnvKey = new Context.Key<>();
+
+    public static DocEnv instance(Context context) {
+        DocEnv instance = context.get(docEnvKey);
+        if (instance == null)
+            instance = new DocEnv(context);
+        return instance;
+    }
+
+    DocLocale doclocale;
+
+    private final Messager messager;
+
+    /** Predefined symbols known to the compiler. */
+    final Symtab syms;
+
+    /** Referenced directly in RootDocImpl. */
+    private final ClassFinder finder;
+
+    /** Javadoc's own version of the compiler's enter phase. */
+    final Enter enter;
+
+    /** The name table. */
+    private Names names;
+
+    /** The encoding name. */
+    private String encoding;
+
+    final Symbol externalizableSym;
+
+    /** Access filter (public, protected, ...).  */
+    protected ModifierFilter showAccess;
+
+    /** True if we are using a sentence BreakIterator. */
+    boolean breakiterator;
+
+    /**
+     * True if we do not want to print any notifications at all.
+     */
+    boolean quiet = false;
+
+    Check chk;
+    Types types;
+    JavaFileManager fileManager;
+    Context context;
+    DocLint doclint;
+
+    WeakHashMap<JCTree, TreePath> treePaths = new WeakHashMap<>();
+
+    /** Allow documenting from class files? */
+    boolean docClasses = false;
+
+    /** Does the doclet only expect pre-1.5 doclet API? */
+    protected boolean legacyDoclet = true;
+
+    /**
+     * Set this to true if you would like to not emit any errors, warnings and
+     * notices.
+     */
+    private boolean silent = false;
+
+    /**
+     * The source language version.
+     */
+    protected Source source;
+
+    /**
+     * Constructor
+     *
+     * @param context      Context for this javadoc instance.
+     */
+    protected DocEnv(Context context) {
+        context.put(docEnvKey, this);
+        this.context = context;
+
+        messager = Messager.instance0(context);
+        syms = Symtab.instance(context);
+        finder = JavadocClassFinder.instance(context);
+        enter = JavadocEnter.instance(context);
+        names = Names.instance(context);
+        externalizableSym = syms.enterClass(syms.java_base, names.fromString("java.io.Externalizable"));
+        chk = Check.instance(context);
+        types = Types.instance(context);
+        fileManager = context.get(JavaFileManager.class);
+        if (fileManager instanceof JavacFileManager) {
+            ((JavacFileManager)fileManager).setSymbolFileEnabled(false);
+        }
+
+        // Default.  Should normally be reset with setLocale.
+        this.doclocale = new DocLocale(this, "", breakiterator);
+        source = Source.instance(context);
+    }
+
+    public void setSilent(boolean silent) {
+        this.silent = silent;
+    }
+
+    /**
+     * Look up ClassDoc by qualified name.
+     */
+    public ClassDocImpl lookupClass(String name) {
+        ClassSymbol c = getClassSymbol(name);
+        if (c != null) {
+            return getClassDoc(c);
+        } else {
+            return null;
+        }
+    }
+
+    /**
+     * Load ClassDoc by qualified name.
+     */
+    public ClassDocImpl loadClass(String name) {
+        try {
+            Name nameImpl = names.fromString(name);
+            ModuleSymbol mod = syms.inferModule(Convert.packagePart(nameImpl));
+            ClassSymbol c = finder.loadClass(mod != null ? mod : syms.errModule, nameImpl);
+            return getClassDoc(c);
+        } catch (CompletionFailure ex) {
+            chk.completionError(null, ex);
+            return null;
+        }
+    }
+
+    /**
+     * Look up PackageDoc by qualified name.
+     */
+    public PackageDocImpl lookupPackage(String name) {
+        //### Jing alleges that class check is needed
+        //### to avoid a compiler bug.  Most likely
+        //### instead a dummy created for error recovery.
+        //### Should investigate this.
+        Name nameImpl = names.fromString(name);
+        ModuleSymbol mod = syms.inferModule(nameImpl);
+        PackageSymbol p = mod != null ? syms.getPackage(mod, nameImpl) : null;
+        ClassSymbol c = getClassSymbol(name);
+        if (p != null && c == null) {
+            return getPackageDoc(p);
+        } else {
+            return null;
+        }
+    }
+        // where
+        /** Retrieve class symbol by fully-qualified name.
+         */
+        ClassSymbol getClassSymbol(String name) {
+            // Name may contain nested class qualification.
+            // Generate candidate flatnames with successively shorter
+            // package qualifiers and longer nested class qualifiers.
+            int nameLen = name.length();
+            char[] nameChars = name.toCharArray();
+            int idx = name.length();
+            for (;;) {
+                Name nameImpl = names.fromChars(nameChars, 0, nameLen);
+                ModuleSymbol mod = syms.inferModule(Convert.packagePart(nameImpl));
+                ClassSymbol s = mod != null ? syms.getClass(mod, nameImpl) : null;
+                if (s != null)
+                    return s; // found it!
+                idx = name.substring(0, idx).lastIndexOf('.');
+                if (idx < 0) break;
+                nameChars[idx] = '$';
+            }
+            return null;
+        }
+
+    /**
+     * Set the locale.
+     */
+    public void setLocale(String localeName) {
+        // create locale specifics
+        doclocale = new DocLocale(this, localeName, breakiterator);
+        // update Messager if locale has changed.
+        messager.setLocale(doclocale.locale);
+    }
+
+    /** Check whether this member should be documented. */
+    public boolean shouldDocument(VarSymbol sym) {
+        long mod = sym.flags();
+
+        if ((mod & Flags.SYNTHETIC) != 0) {
+            return false;
+        }
+
+        return showAccess.checkModifier(translateModifiers(mod));
+    }
+
+    /** Check whether this member should be documented. */
+    public boolean shouldDocument(MethodSymbol sym) {
+        long mod = sym.flags();
+
+        if ((mod & Flags.SYNTHETIC) != 0) {
+            return false;
+        }
+
+        return showAccess.checkModifier(translateModifiers(mod));
+    }
+
+    /** check whether this class should be documented. */
+    public boolean shouldDocument(ClassSymbol sym) {
+        return
+            (sym.flags_field&Flags.SYNTHETIC) == 0 && // no synthetics
+            (docClasses || getClassDoc(sym).tree != null) &&
+            isVisible(sym);
+    }
+
+    //### Comment below is inaccurate wrt modifier filter testing
+    /**
+     * Check the visibility if this is an nested class.
+     * if this is not a nested class, return true.
+     * if this is an static visible nested class,
+     *    return true.
+     * if this is an visible nested class
+     *    if the outer class is visible return true.
+     *    else return false.
+     * IMPORTANT: This also allows, static nested classes
+     * to be defined inside an nested class, which is not
+     * allowed by the compiler. So such an test case will
+     * not reach upto this method itself, but if compiler
+     * allows it, then that will go through.
+     */
+    protected boolean isVisible(ClassSymbol sym) {
+        long mod = sym.flags_field;
+        if (!showAccess.checkModifier(translateModifiers(mod))) {
+            return false;
+        }
+        ClassSymbol encl = sym.owner.enclClass();
+        return (encl == null || (mod & Flags.STATIC) != 0 || isVisible(encl));
+    }
+
+    //---------------- print forwarders ----------------//
+
+    /**
+     * Print error message, increment error count.
+     *
+     * @param msg message to print.
+     */
+    public void printError(String msg) {
+        if (silent)
+            return;
+        messager.printError(msg);
+    }
+
+    /**
+     * Print error message, increment error count.
+     *
+     * @param key selects message from resource
+     */
+    public void error(DocImpl doc, String key) {
+        if (silent)
+            return;
+        messager.error(doc==null ? null : doc.position(), key);
+    }
+
+    /**
+     * Print error message, increment error count.
+     *
+     * @param key selects message from resource
+     */
+    public void error(SourcePosition pos, String key) {
+        if (silent)
+            return;
+        messager.error(pos, key);
+    }
+
+    /**
+     * Print error message, increment error count.
+     *
+     * @param msg message to print.
+     */
+    public void printError(SourcePosition pos, String msg) {
+        if (silent)
+            return;
+        messager.printError(pos, msg);
+    }
+
+    /**
+     * Print error message, increment error count.
+     *
+     * @param key selects message from resource
+     * @param a1 first argument
+     */
+    public void error(DocImpl doc, String key, String a1) {
+        if (silent)
+            return;
+        messager.error(doc==null ? null : doc.position(), key, a1);
+    }
+
+    /**
+     * Print error message, increment error count.
+     *
+     * @param key selects message from resource
+     * @param a1 first argument
+     * @param a2 second argument
+     */
+    public void error(DocImpl doc, String key, String a1, String a2) {
+        if (silent)
+            return;
+        messager.error(doc==null ? null : doc.position(), key, a1, a2);
+    }
+
+    /**
+     * Print error message, increment error count.
+     *
+     * @param key selects message from resource
+     * @param a1 first argument
+     * @param a2 second argument
+     * @param a3 third argument
+     */
+    public void error(DocImpl doc, String key, String a1, String a2, String a3) {
+        if (silent)
+            return;
+        messager.error(doc==null ? null : doc.position(), key, a1, a2, a3);
+    }
+
+    /**
+     * Print warning message, increment warning count.
+     *
+     * @param msg message to print.
+     */
+    public void printWarning(String msg) {
+        if (silent)
+            return;
+        messager.printWarning(msg);
+    }
+
+    /**
+     * Print warning message, increment warning count.
+     *
+     * @param key selects message from resource
+     */
+    public void warning(DocImpl doc, String key) {
+        if (silent)
+            return;
+        messager.warning(doc==null ? null : doc.position(), key);
+    }
+
+    /**
+     * Print warning message, increment warning count.
+     *
+     * @param msg message to print.
+     */
+    public void printWarning(SourcePosition pos, String msg) {
+        if (silent)
+            return;
+        messager.printWarning(pos, msg);
+    }
+
+    /**
+     * Print warning message, increment warning count.
+     *
+     * @param key selects message from resource
+     * @param a1 first argument
+     */
+    public void warning(DocImpl doc, String key, String a1) {
+        if (silent)
+            return;
+        // suppress messages that have (probably) been covered by doclint
+        if (doclint != null && doc != null && key.startsWith("tag"))
+            return;
+        messager.warning(doc==null ? null : doc.position(), key, a1);
+    }
+
+    /**
+     * Print warning message, increment warning count.
+     *
+     * @param key selects message from resource
+     * @param a1 first argument
+     * @param a2 second argument
+     */
+    public void warning(DocImpl doc, String key, String a1, String a2) {
+        if (silent)
+            return;
+        messager.warning(doc==null ? null : doc.position(), key, a1, a2);
+    }
+
+    /**
+     * Print warning message, increment warning count.
+     *
+     * @param key selects message from resource
+     * @param a1 first argument
+     * @param a2 second argument
+     * @param a3 third argument
+     */
+    public void warning(DocImpl doc, String key, String a1, String a2, String a3) {
+        if (silent)
+            return;
+        messager.warning(doc==null ? null : doc.position(), key, a1, a2, a3);
+    }
+
+    /**
+     * Print warning message, increment warning count.
+     *
+     * @param key selects message from resource
+     * @param a1 first argument
+     * @param a2 second argument
+     * @param a3 third argument
+     */
+    public void warning(DocImpl doc, String key, String a1, String a2, String a3,
+                        String a4) {
+        if (silent)
+            return;
+        messager.warning(doc==null ? null : doc.position(), key, a1, a2, a3, a4);
+    }
+
+    /**
+     * Print a message.
+     *
+     * @param msg message to print.
+     */
+    public void printNotice(String msg) {
+        if (silent || quiet)
+            return;
+        messager.printNotice(msg);
+    }
+
+
+    /**
+     * Print a message.
+     *
+     * @param key selects message from resource
+     */
+    public void notice(String key) {
+        if (silent || quiet)
+            return;
+        messager.notice(key);
+    }
+
+    /**
+     * Print a message.
+     *
+     * @param msg message to print.
+     */
+    public void printNotice(SourcePosition pos, String msg) {
+        if (silent || quiet)
+            return;
+        messager.printNotice(pos, msg);
+    }
+
+    /**
+     * Print a message.
+     *
+     * @param key selects message from resource
+     * @param a1 first argument
+     */
+    public void notice(String key, String a1) {
+        if (silent || quiet)
+            return;
+        messager.notice(key, a1);
+    }
+
+    /**
+     * Print a message.
+     *
+     * @param key selects message from resource
+     * @param a1 first argument
+     * @param a2 second argument
+     */
+    public void notice(String key, String a1, String a2) {
+        if (silent || quiet)
+            return;
+        messager.notice(key, a1, a2);
+    }
+
+    /**
+     * Print a message.
+     *
+     * @param key selects message from resource
+     * @param a1 first argument
+     * @param a2 second argument
+     * @param a3 third argument
+     */
+    public void notice(String key, String a1, String a2, String a3) {
+        if (silent || quiet)
+            return;
+        messager.notice(key, a1, a2, a3);
+    }
+
+    /**
+     * Exit, reporting errors and warnings.
+     */
+    public void exit() {
+        // Messager should be replaced by a more general
+        // compilation environment.  This can probably
+        // subsume DocEnv as well.
+        messager.exit();
+    }
+
+    protected Map<PackageSymbol, PackageDocImpl> packageMap = new HashMap<>();
+    /**
+     * Return the PackageDoc of this package symbol.
+     */
+    public PackageDocImpl getPackageDoc(PackageSymbol pack) {
+        PackageDocImpl result = packageMap.get(pack);
+        if (result != null) return result;
+        result = new PackageDocImpl(this, pack);
+        packageMap.put(pack, result);
+        return result;
+    }
+
+    /**
+     * Create the PackageDoc (or a subtype) for a package symbol.
+     */
+    void makePackageDoc(PackageSymbol pack, TreePath treePath) {
+        PackageDocImpl result = packageMap.get(pack);
+        if (result != null) {
+            if (treePath != null) result.setTreePath(treePath);
+        } else {
+            result = new PackageDocImpl(this, pack, treePath);
+            packageMap.put(pack, result);
+        }
+    }
+
+
+    protected Map<ClassSymbol, ClassDocImpl> classMap = new HashMap<>();
+    /**
+     * Return the ClassDoc (or a subtype) of this class symbol.
+     */
+    public ClassDocImpl getClassDoc(ClassSymbol clazz) {
+        ClassDocImpl result = classMap.get(clazz);
+        if (result != null) return result;
+        if (isAnnotationType(clazz)) {
+            result = new AnnotationTypeDocImpl(this, clazz);
+        } else {
+            result = new ClassDocImpl(this, clazz);
+        }
+        classMap.put(clazz, result);
+        return result;
+    }
+
+    /**
+     * Create the ClassDoc (or a subtype) for a class symbol.
+     */
+    protected void makeClassDoc(ClassSymbol clazz, TreePath treePath) {
+        ClassDocImpl result = classMap.get(clazz);
+        if (result != null) {
+            if (treePath != null) result.setTreePath(treePath);
+            return;
+        }
+        if (isAnnotationType((JCClassDecl) treePath.getLeaf())) {   // flags of clazz may not yet be set
+            result = new AnnotationTypeDocImpl(this, clazz, treePath);
+        } else {
+            result = new ClassDocImpl(this, clazz, treePath);
+        }
+        classMap.put(clazz, result);
+    }
+
+    protected static boolean isAnnotationType(ClassSymbol clazz) {
+        return ClassDocImpl.isAnnotationType(clazz);
+    }
+
+    protected static boolean isAnnotationType(JCClassDecl tree) {
+        return (tree.mods.flags & Flags.ANNOTATION) != 0;
+    }
+
+    protected Map<VarSymbol, FieldDocImpl> fieldMap = new HashMap<>();
+    /**
+     * Return the FieldDoc of this var symbol.
+     */
+    public FieldDocImpl getFieldDoc(VarSymbol var) {
+        FieldDocImpl result = fieldMap.get(var);
+        if (result != null) return result;
+        result = new FieldDocImpl(this, var);
+        fieldMap.put(var, result);
+        return result;
+    }
+    /**
+     * Create a FieldDoc for a var symbol.
+     */
+    protected void makeFieldDoc(VarSymbol var, TreePath treePath) {
+        FieldDocImpl result = fieldMap.get(var);
+        if (result != null) {
+            if (treePath != null) result.setTreePath(treePath);
+        } else {
+            result = new FieldDocImpl(this, var, treePath);
+            fieldMap.put(var, result);
+        }
+    }
+
+    protected Map<MethodSymbol, ExecutableMemberDocImpl> methodMap = new HashMap<>();
+    /**
+     * Create a MethodDoc for this MethodSymbol.
+     * Should be called only on symbols representing methods.
+     */
+    protected void makeMethodDoc(MethodSymbol meth, TreePath treePath) {
+        MethodDocImpl result = (MethodDocImpl)methodMap.get(meth);
+        if (result != null) {
+            if (treePath != null) result.setTreePath(treePath);
+        } else {
+            result = new MethodDocImpl(this, meth, treePath);
+            methodMap.put(meth, result);
+        }
+    }
+
+    /**
+     * Return the MethodDoc for a MethodSymbol.
+     * Should be called only on symbols representing methods.
+     */
+    public MethodDocImpl getMethodDoc(MethodSymbol meth) {
+        assert !meth.isConstructor() : "not expecting a constructor symbol";
+        MethodDocImpl result = (MethodDocImpl)methodMap.get(meth);
+        if (result != null) return result;
+        result = new MethodDocImpl(this, meth);
+        methodMap.put(meth, result);
+        return result;
+    }
+
+    /**
+     * Create the ConstructorDoc for a MethodSymbol.
+     * Should be called only on symbols representing constructors.
+     */
+    protected void makeConstructorDoc(MethodSymbol meth, TreePath treePath) {
+        ConstructorDocImpl result = (ConstructorDocImpl)methodMap.get(meth);
+        if (result != null) {
+            if (treePath != null) result.setTreePath(treePath);
+        } else {
+            result = new ConstructorDocImpl(this, meth, treePath);
+            methodMap.put(meth, result);
+        }
+    }
+
+    /**
+     * Return the ConstructorDoc for a MethodSymbol.
+     * Should be called only on symbols representing constructors.
+     */
+    public ConstructorDocImpl getConstructorDoc(MethodSymbol meth) {
+        assert meth.isConstructor() : "expecting a constructor symbol";
+        ConstructorDocImpl result = (ConstructorDocImpl)methodMap.get(meth);
+        if (result != null) return result;
+        result = new ConstructorDocImpl(this, meth);
+        methodMap.put(meth, result);
+        return result;
+    }
+
+    /**
+     * Create the AnnotationTypeElementDoc for a MethodSymbol.
+     * Should be called only on symbols representing annotation type elements.
+     */
+    protected void makeAnnotationTypeElementDoc(MethodSymbol meth, TreePath treePath) {
+        AnnotationTypeElementDocImpl result =
+            (AnnotationTypeElementDocImpl)methodMap.get(meth);
+        if (result != null) {
+            if (treePath != null) result.setTreePath(treePath);
+        } else {
+            result =
+                new AnnotationTypeElementDocImpl(this, meth, treePath);
+            methodMap.put(meth, result);
+        }
+    }
+
+    /**
+     * Return the AnnotationTypeElementDoc for a MethodSymbol.
+     * Should be called only on symbols representing annotation type elements.
+     */
+    public AnnotationTypeElementDocImpl getAnnotationTypeElementDoc(
+            MethodSymbol meth) {
+
+        AnnotationTypeElementDocImpl result =
+            (AnnotationTypeElementDocImpl)methodMap.get(meth);
+        if (result != null) return result;
+        result = new AnnotationTypeElementDocImpl(this, meth);
+        methodMap.put(meth, result);
+        return result;
+    }
+
+//  private Map<ClassType, ParameterizedTypeImpl> parameterizedTypeMap =
+//          new HashMap<ClassType, ParameterizedTypeImpl>();
+    /**
+     * Return the ParameterizedType of this instantiation.
+//   * ### Could use Type.sameTypeAs() instead of equality matching in hashmap
+//   * ### to avoid some duplication.
+     */
+    ParameterizedTypeImpl getParameterizedType(ClassType t) {
+        return new ParameterizedTypeImpl(this, t);
+//      ParameterizedTypeImpl result = parameterizedTypeMap.get(t);
+//      if (result != null) return result;
+//      result = new ParameterizedTypeImpl(this, t);
+//      parameterizedTypeMap.put(t, result);
+//      return result;
+    }
+
+    TreePath getTreePath(JCCompilationUnit tree) {
+        TreePath p = treePaths.get(tree);
+        if (p == null)
+            treePaths.put(tree, p = new TreePath(tree));
+        return p;
+    }
+
+    TreePath getTreePath(JCCompilationUnit toplevel, JCPackageDecl tree) {
+        TreePath p = treePaths.get(tree);
+        if (p == null)
+            treePaths.put(tree, p = new TreePath(getTreePath(toplevel), tree));
+        return p;
+    }
+
+    TreePath getTreePath(JCCompilationUnit toplevel, JCClassDecl tree) {
+        TreePath p = treePaths.get(tree);
+        if (p == null)
+            treePaths.put(tree, p = new TreePath(getTreePath(toplevel), tree));
+        return p;
+    }
+
+    TreePath getTreePath(JCCompilationUnit toplevel, JCClassDecl cdecl, JCTree tree) {
+        return new TreePath(getTreePath(toplevel, cdecl), tree);
+    }
+
+    /**
+     * Set the encoding.
+     */
+    public void setEncoding(String encoding) {
+        this.encoding = encoding;
+    }
+
+    /**
+     * Get the encoding.
+     */
+    public String getEncoding() {
+        return encoding;
+    }
+
+    /**
+     * Convert modifier bits from private coding used by
+     * the compiler to that of java.lang.reflect.Modifier.
+     */
+    static int translateModifiers(long flags) {
+        int result = 0;
+        if ((flags & Flags.ABSTRACT) != 0)
+            result |= Modifier.ABSTRACT;
+        if ((flags & Flags.FINAL) != 0)
+            result |= Modifier.FINAL;
+        if ((flags & Flags.INTERFACE) != 0)
+            result |= Modifier.INTERFACE;
+        if ((flags & Flags.NATIVE) != 0)
+            result |= Modifier.NATIVE;
+        if ((flags & Flags.PRIVATE) != 0)
+            result |= Modifier.PRIVATE;
+        if ((flags & Flags.PROTECTED) != 0)
+            result |= Modifier.PROTECTED;
+        if ((flags & Flags.PUBLIC) != 0)
+            result |= Modifier.PUBLIC;
+        if ((flags & Flags.STATIC) != 0)
+            result |= Modifier.STATIC;
+        if ((flags & Flags.SYNCHRONIZED) != 0)
+            result |= Modifier.SYNCHRONIZED;
+        if ((flags & Flags.TRANSIENT) != 0)
+            result |= Modifier.TRANSIENT;
+        if ((flags & Flags.VOLATILE) != 0)
+            result |= Modifier.VOLATILE;
+        return result;
+    }
+
+    void initDoclint(Collection<String> opts, Collection<String> customTagNames, String htmlVersion) {
+        ArrayList<String> doclintOpts = new ArrayList<>();
+        boolean msgOptionSeen = false;
+
+        for (String opt : opts) {
+            if (opt.startsWith(DocLint.XMSGS_OPTION)) {
+                if (opt.equals(DocLint.XMSGS_CUSTOM_PREFIX + "none"))
+                    return;
+                msgOptionSeen = true;
+            }
+            doclintOpts.add(opt);
+        }
+
+        if (!msgOptionSeen) {
+            doclintOpts.add(DocLint.XMSGS_OPTION);
+        }
+
+        String sep = "";
+        StringBuilder customTags = new StringBuilder();
+        for (String customTag : customTagNames) {
+            customTags.append(sep);
+            customTags.append(customTag);
+            sep = DocLint.SEPARATOR;
+        }
+        doclintOpts.add(DocLint.XCUSTOM_TAGS_PREFIX + customTags.toString());
+        doclintOpts.add(DocLint.XHTML_VERSION_PREFIX + htmlVersion);
+
+        JavacTask t = BasicJavacTask.instance(context);
+        doclint = new DocLint();
+        // standard doclet normally generates H1, H2
+        doclintOpts.add(DocLint.XIMPLICIT_HEADERS + "2");
+        doclint.init(t, doclintOpts.toArray(new String[doclintOpts.size()]), false);
+    }
+
+    boolean showTagMessages() {
+        return (doclint == null);
+    }
+
+    Map<CompilationUnitTree, Boolean> shouldCheck = new HashMap<>();
+
+    boolean shouldCheck(CompilationUnitTree unit) {
+        return shouldCheck.computeIfAbsent(unit, doclint :: shouldCheck);
+    }
+}