jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/comp/MemberEnter.java@8b4e1421a9b7 (annotated)

src/share/classes/com/sun/tools/javac/comp/MemberEnter.java@8b4e1421a9b7 (annotated)

src/share/classes/com/sun/tools/javac/comp/MemberEnter.java

Fri, 01 Nov 2013 21:43:27 +0100

author: jlahoda
date: Fri, 01 Nov 2013 21:43:27 +0100
changeset 2179: 8b4e1421a9b7
parent 2167: d2fa3f7e964e
child 2424: 7e97c65c373c
permissions: -rw-r--r--

8027310: Annotation Processor crashes with NPE
Summary: JCAnnotation.attribute is null when annotation type is unavailable
Reviewed-by: jjg, jfranck

 /*
  * Copyright (c) 2003, 2013, 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.javac.comp;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Set;
 import javax.tools.JavaFileObject;
 import com.sun.tools.javac.code.*;
 import com.sun.tools.javac.jvm.*;
 import com.sun.tools.javac.tree.*;
 import com.sun.tools.javac.util.*;
 import com.sun.tools.javac.code.Type.*;
 import com.sun.tools.javac.code.Symbol.*;
 import com.sun.tools.javac.tree.JCTree.*;
 import static com.sun.tools.javac.code.Flags.*;
 import static com.sun.tools.javac.code.Flags.ANNOTATION;
 import static com.sun.tools.javac.code.Kinds.*;
 import static com.sun.tools.javac.code.TypeTag.CLASS;
 import static com.sun.tools.javac.code.TypeTag.ERROR;
 import static com.sun.tools.javac.code.TypeTag.TYPEVAR;
 import static com.sun.tools.javac.tree.JCTree.Tag.*;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
 /** This is the second phase of Enter, in which classes are completed
  *  by entering their members into the class scope using
  *  MemberEnter.complete().  See Enter for an overview.
  *
  *  <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 MemberEnter extends JCTree.Visitor implements Completer {
     protected static final Context.Key<MemberEnter> memberEnterKey =
         new Context.Key<MemberEnter>();
     /** A switch to determine whether we check for package/class conflicts
      */
     final static boolean checkClash = true;
     private final Names names;
     private final Enter enter;
     private final Log log;
     private final Check chk;
     private final Attr attr;
     private final Symtab syms;
     private final TreeMaker make;
     private final ClassReader reader;
     private final Todo todo;
     private final Annotate annotate;
     private final TypeAnnotations typeAnnotations;
     private final Types types;
     private final JCDiagnostic.Factory diags;
     private final Source source;
     private final Target target;
     private final DeferredLintHandler deferredLintHandler;
     private final Lint lint;
     public static MemberEnter instance(Context context) {
         MemberEnter instance = context.get(memberEnterKey);
         if (instance == null)
             instance = new MemberEnter(context);
         return instance;
     }
     protected MemberEnter(Context context) {
         context.put(memberEnterKey, this);
         names = Names.instance(context);
         enter = Enter.instance(context);
         log = Log.instance(context);
         chk = Check.instance(context);
         attr = Attr.instance(context);
         syms = Symtab.instance(context);
         make = TreeMaker.instance(context);
         reader = ClassReader.instance(context);
         todo = Todo.instance(context);
         annotate = Annotate.instance(context);
         typeAnnotations = TypeAnnotations.instance(context);
         types = Types.instance(context);
         diags = JCDiagnostic.Factory.instance(context);
         source = Source.instance(context);
         target = Target.instance(context);
         deferredLintHandler = DeferredLintHandler.instance(context);
         lint = Lint.instance(context);
         allowTypeAnnos = source.allowTypeAnnotations();
         allowRepeatedAnnos = source.allowRepeatedAnnotations();
     }
     /** Switch: support type annotations.
      */
     boolean allowTypeAnnos;
     boolean allowRepeatedAnnos;
     /** A queue for classes whose members still need to be entered into the
      *  symbol table.
      */
     ListBuffer<Env<AttrContext>> halfcompleted = new ListBuffer<Env<AttrContext>>();
     /** Set to true only when the first of a set of classes is
      *  processed from the half completed queue.
      */
     boolean isFirst = true;
     /** A flag to disable completion from time to time during member
      *  enter, as we only need to look up types.  This avoids
      *  unnecessarily deep recursion.
      */
     boolean completionEnabled = true;
     /* ---------- Processing import clauses ----------------
      */
     /** Import all classes of a class or package on demand.
      *  @param pos           Position to be used for error reporting.
      *  @param tsym          The class or package the members of which are imported.
      *  @param env           The env in which the imported classes will be entered.
      */
     private void importAll(int pos,
                            final TypeSymbol tsym,
                            Env<AttrContext> env) {
         // Check that packages imported from exist (JLS ???).
         if (tsym.kind == PCK && tsym.members().elems == null && !tsym.exists()) {
             // If we can't find java.lang, exit immediately.
             if (((PackageSymbol)tsym).fullname.equals(names.java_lang)) {
                 JCDiagnostic msg = diags.fragment("fatal.err.no.java.lang");
                 throw new FatalError(msg);
             } else {
                 log.error(DiagnosticFlag.RESOLVE_ERROR, pos, "doesnt.exist", tsym);
             }
         }
         env.toplevel.starImportScope.importAll(tsym.members());
     }
     /** Import all static members of a class or package on demand.
      *  @param pos           Position to be used for error reporting.
      *  @param tsym          The class or package the members of which are imported.
      *  @param env           The env in which the imported classes will be entered.
      */
     private void importStaticAll(int pos,
                                  final TypeSymbol tsym,
                                  Env<AttrContext> env) {
         final JavaFileObject sourcefile = env.toplevel.sourcefile;
         final Scope toScope = env.toplevel.starImportScope;
         final PackageSymbol packge = env.toplevel.packge;
         final TypeSymbol origin = tsym;
         // enter imported types immediately
         new Object() {
             Set<Symbol> processed = new HashSet<Symbol>();
             void importFrom(TypeSymbol tsym) {
                 if (tsym == null || !processed.add(tsym))
                     return;
                 // also import inherited names
                 importFrom(types.supertype(tsym.type).tsym);
                 for (Type t : types.interfaces(tsym.type))
                     importFrom(t.tsym);
                 final Scope fromScope = tsym.members();
                 for (Scope.Entry e = fromScope.elems; e != null; e = e.sibling) {
                     Symbol sym = e.sym;
                     if (sym.kind == TYP &&
                         (sym.flags() & STATIC) != 0 &&
                         staticImportAccessible(sym, packge) &&
                         sym.isMemberOf(origin, types) &&
                         !toScope.includes(sym))
                         toScope.enter(sym, fromScope, origin.members(), true);
                 }
             }
         }.importFrom(tsym);
         // enter non-types before annotations that might use them
         annotate.earlier(new Annotate.Worker() {
             Set<Symbol> processed = new HashSet<Symbol>();
             public String toString() {
                 return "import static " + tsym + ".*" + " in " + sourcefile;
             }
             void importFrom(TypeSymbol tsym) {
                 if (tsym == null || !processed.add(tsym))
                     return;
                 // also import inherited names
                 importFrom(types.supertype(tsym.type).tsym);
                 for (Type t : types.interfaces(tsym.type))
                     importFrom(t.tsym);
                 final Scope fromScope = tsym.members();
                 for (Scope.Entry e = fromScope.elems; e != null; e = e.sibling) {
                     Symbol sym = e.sym;
                     if (sym.isStatic() && sym.kind != TYP &&
                         staticImportAccessible(sym, packge) &&
                         !toScope.includes(sym) &&
                         sym.isMemberOf(origin, types)) {
                         toScope.enter(sym, fromScope, origin.members(), true);
                     }
                 }
             }
             public void run() {
                 importFrom(tsym);
             }
         });
     }
     // is the sym accessible everywhere in packge?
     boolean staticImportAccessible(Symbol sym, PackageSymbol packge) {
         int flags = (int)(sym.flags() & AccessFlags);
         switch (flags) {
         default:
         case PUBLIC:
             return true;
         case PRIVATE:
             return false;
         case 0:
         case PROTECTED:
             return sym.packge() == packge;
         }
     }
     /** Import statics types of a given name.  Non-types are handled in Attr.
      *  @param pos           Position to be used for error reporting.
      *  @param tsym          The class from which the name is imported.
      *  @param name          The (simple) name being imported.
      *  @param env           The environment containing the named import
      *                  scope to add to.
      */
     private void importNamedStatic(final DiagnosticPosition pos,
                                    final TypeSymbol tsym,
                                    final Name name,
                                    final Env<AttrContext> env) {
         if (tsym.kind != TYP) {
             log.error(DiagnosticFlag.RECOVERABLE, pos, "static.imp.only.classes.and.interfaces");
             return;
         }
         final Scope toScope = env.toplevel.namedImportScope;
         final PackageSymbol packge = env.toplevel.packge;
         final TypeSymbol origin = tsym;
         // enter imported types immediately
         new Object() {
             Set<Symbol> processed = new HashSet<Symbol>();
             void importFrom(TypeSymbol tsym) {
                 if (tsym == null || !processed.add(tsym))
                     return;
                 // also import inherited names
                 importFrom(types.supertype(tsym.type).tsym);
                 for (Type t : types.interfaces(tsym.type))
                     importFrom(t.tsym);
                 for (Scope.Entry e = tsym.members().lookup(name);
                      e.scope != null;
                      e = e.next()) {
                     Symbol sym = e.sym;
                     if (sym.isStatic() &&
                         sym.kind == TYP &&
                         staticImportAccessible(sym, packge) &&
                         sym.isMemberOf(origin, types) &&
                         chk.checkUniqueStaticImport(pos, sym, toScope))
                         toScope.enter(sym, sym.owner.members(), origin.members(), true);
                 }
             }
         }.importFrom(tsym);
         // enter non-types before annotations that might use them
         annotate.earlier(new Annotate.Worker() {
             Set<Symbol> processed = new HashSet<Symbol>();
             boolean found = false;
             public String toString() {
                 return "import static " + tsym + "." + name;
             }
             void importFrom(TypeSymbol tsym) {
                 if (tsym == null || !processed.add(tsym))
                     return;
                 // also import inherited names
                 importFrom(types.supertype(tsym.type).tsym);
                 for (Type t : types.interfaces(tsym.type))
                     importFrom(t.tsym);
                 for (Scope.Entry e = tsym.members().lookup(name);
                      e.scope != null;
                      e = e.next()) {
                     Symbol sym = e.sym;
                     if (sym.isStatic() &&
                         staticImportAccessible(sym, packge) &&
                         sym.isMemberOf(origin, types)) {
                         found = true;
                         if (sym.kind != TYP) {
                             toScope.enter(sym, sym.owner.members(), origin.members(), true);
                         }
                     }
                 }
             }
             public void run() {
                 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
                 try {
                     importFrom(tsym);
                     if (!found) {
                         log.error(pos, "cant.resolve.location",
                                   KindName.STATIC,
                                   name, List.<Type>nil(), List.<Type>nil(),
                                   Kinds.typeKindName(tsym.type),
                                   tsym.type);
                     }
                 } finally {
                     log.useSource(prev);
                 }
             }
         });
     }
     /** Import given class.
      *  @param pos           Position to be used for error reporting.
      *  @param tsym          The class to be imported.
      *  @param env           The environment containing the named import
      *                  scope to add to.
      */
     private void importNamed(DiagnosticPosition pos, Symbol tsym, Env<AttrContext> env) {
         if (tsym.kind == TYP &&
             chk.checkUniqueImport(pos, tsym, env.toplevel.namedImportScope))
             env.toplevel.namedImportScope.enter(tsym, tsym.owner.members());
     }
     /** Construct method type from method signature.
      *  @param typarams    The method's type parameters.
      *  @param params      The method's value parameters.
      *  @param res             The method's result type,
      *                 null if it is a constructor.
      *  @param recvparam       The method's receiver parameter,
      *                 null if none given; TODO: or already set here?
      *  @param thrown      The method's thrown exceptions.
      *  @param env             The method's (local) environment.
      */
     Type signature(MethodSymbol msym,
                    List<JCTypeParameter> typarams,
                    List<JCVariableDecl> params,
                    JCTree res,
                    JCVariableDecl recvparam,
                    List<JCExpression> thrown,
                    Env<AttrContext> env) {
         // Enter and attribute type parameters.
         List<Type> tvars = enter.classEnter(typarams, env);
         attr.attribTypeVariables(typarams, env);
         // Enter and attribute value parameters.
         ListBuffer<Type> argbuf = new ListBuffer<Type>();
         for (List<JCVariableDecl> l = params; l.nonEmpty(); l = l.tail) {
             memberEnter(l.head, env);
             argbuf.append(l.head.vartype.type);
         }
         // Attribute result type, if one is given.
         Type restype = res == null ? syms.voidType : attr.attribType(res, env);
         // Attribute receiver type, if one is given.
         Type recvtype;
         if (recvparam!=null) {
             memberEnter(recvparam, env);
             recvtype = recvparam.vartype.type;
         } else {
             recvtype = null;
         }
         // Attribute thrown exceptions.
         ListBuffer<Type> thrownbuf = new ListBuffer<Type>();
         for (List<JCExpression> l = thrown; l.nonEmpty(); l = l.tail) {
             Type exc = attr.attribType(l.head, env);
             if (!exc.hasTag(TYPEVAR)) {
                 exc = chk.checkClassType(l.head.pos(), exc);
             } else if (exc.tsym.owner == msym) {
                 //mark inference variables in 'throws' clause
                 exc.tsym.flags_field |= THROWS;
             }
             thrownbuf.append(exc);
         }
         MethodType mtype = new MethodType(argbuf.toList(),
                                     restype,
                                     thrownbuf.toList(),
                                     syms.methodClass);
         mtype.recvtype = recvtype;
         return tvars.isEmpty() ? mtype : new ForAll(tvars, mtype);
     }
 /* ********************************************************************
  * Visitor methods for member enter
  *********************************************************************/
     /** Visitor argument: the current environment
      */
     protected Env<AttrContext> env;
     /** Enter field and method definitions and process import
      *  clauses, catching any completion failure exceptions.
      */
     protected void memberEnter(JCTree tree, Env<AttrContext> env) {
         Env<AttrContext> prevEnv = this.env;
         try {
             this.env = env;
             tree.accept(this);
         }  catch (CompletionFailure ex) {
             chk.completionError(tree.pos(), ex);
         } finally {
             this.env = prevEnv;
         }
     }
     /** Enter members from a list of trees.
      */
     void memberEnter(List<? extends JCTree> trees, Env<AttrContext> env) {
         for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail)
             memberEnter(l.head, env);
     }
     /** Enter members for a class.
      */
     void finishClass(JCClassDecl tree, Env<AttrContext> env) {
         if ((tree.mods.flags & Flags.ENUM) != 0 &&
             (types.supertype(tree.sym.type).tsym.flags() & Flags.ENUM) == 0) {
             addEnumMembers(tree, env);
         }
         memberEnter(tree.defs, env);
     }
     /** Add the implicit members for an enum type
      *  to the symbol table.
      */
     private void addEnumMembers(JCClassDecl tree, Env<AttrContext> env) {
         JCExpression valuesType = make.Type(new ArrayType(tree.sym.type, syms.arrayClass));
         // public static T[] values() { return ???; }
         JCMethodDecl values = make.
             MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC),
                       names.values,
                       valuesType,
                       List.<JCTypeParameter>nil(),
                       List.<JCVariableDecl>nil(),
                       List.<JCExpression>nil(), // thrown
                       null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))),
                       null);
         memberEnter(values, env);
         // public static T valueOf(String name) { return ???; }
         JCMethodDecl valueOf = make.
             MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC),
                       names.valueOf,
                       make.Type(tree.sym.type),
                       List.<JCTypeParameter>nil(),
                       List.of(make.VarDef(make.Modifiers(Flags.PARAMETER |
                                                          Flags.MANDATED),
                                             names.fromString("name"),
                                             make.Type(syms.stringType), null)),
                       List.<JCExpression>nil(), // thrown
                       null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))),
                       null);
         memberEnter(valueOf, env);
     }
     public void visitTopLevel(JCCompilationUnit tree) {
         if (tree.starImportScope.elems != null) {
             // we must have already processed this toplevel
             return;
         }
         // check that no class exists with same fully qualified name as
         // toplevel package
         if (checkClash && tree.pid != null) {
             Symbol p = tree.packge;
             while (p.owner != syms.rootPackage) {
                 p.owner.complete(); // enter all class members of p
                 if (syms.classes.get(p.getQualifiedName()) != null) {
                     log.error(tree.pos,
                               "pkg.clashes.with.class.of.same.name",
                               p);
                 }
                 p = p.owner;
             }
         }
         // process package annotations
         annotateLater(tree.packageAnnotations, env, tree.packge, null);
         DiagnosticPosition prevLintPos = deferredLintHandler.immediate();
         Lint prevLint = chk.setLint(lint);
         try {
             // Import-on-demand java.lang.
             importAll(tree.pos, reader.enterPackage(names.java_lang), env);
             // Process all import clauses.
             memberEnter(tree.defs, env);
         } finally {
             chk.setLint(prevLint);
             deferredLintHandler.setPos(prevLintPos);
         }
     }
     // process the non-static imports and the static imports of types.
     public void visitImport(JCImport tree) {
         JCFieldAccess imp = (JCFieldAccess)tree.qualid;
         Name name = TreeInfo.name(imp);
         // Create a local environment pointing to this tree to disable
         // effects of other imports in Resolve.findGlobalType
         Env<AttrContext> localEnv = env.dup(tree);
         TypeSymbol p = attr.attribImportQualifier(tree, localEnv).tsym;
         if (name == names.asterisk) {
             // Import on demand.
             chk.checkCanonical(imp.selected);
             if (tree.staticImport)
                 importStaticAll(tree.pos, p, env);
             else
                 importAll(tree.pos, p, env);
         } else {
             // Named type import.
             if (tree.staticImport) {
                 importNamedStatic(tree.pos(), p, name, localEnv);
                 chk.checkCanonical(imp.selected);
             } else {
                 TypeSymbol c = attribImportType(imp, localEnv).tsym;
                 chk.checkCanonical(imp);
                 importNamed(tree.pos(), c, env);
             }
         }
     }
     public void visitMethodDef(JCMethodDecl tree) {
         Scope enclScope = enter.enterScope(env);
         MethodSymbol m = new MethodSymbol(0, tree.name, null, enclScope.owner);
         m.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, m, tree);
         tree.sym = m;
         //if this is a default method, add the DEFAULT flag to the enclosing interface
         if ((tree.mods.flags & DEFAULT) != 0) {
             m.enclClass().flags_field |= DEFAULT;
         }
         Env<AttrContext> localEnv = methodEnv(tree, env);
         annotate.enterStart();
         try {
             DiagnosticPosition prevLintPos = deferredLintHandler.setPos(tree.pos());
             try {
                 // Compute the method type
                 m.type = signature(m, tree.typarams, tree.params,
                                    tree.restype, tree.recvparam,
                                    tree.thrown,
                                    localEnv);
             } finally {
                 deferredLintHandler.setPos(prevLintPos);
             }
             if (types.isSignaturePolymorphic(m)) {
                 m.flags_field |= SIGNATURE_POLYMORPHIC;
             }
             // Set m.params
             ListBuffer<VarSymbol> params = new ListBuffer<VarSymbol>();
             JCVariableDecl lastParam = null;
             for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
                 JCVariableDecl param = lastParam = l.head;
                 params.append(Assert.checkNonNull(param.sym));
             }
             m.params = params.toList();
             // mark the method varargs, if necessary
             if (lastParam != null && (lastParam.mods.flags & Flags.VARARGS) != 0)
                 m.flags_field |= Flags.VARARGS;
             localEnv.info.scope.leave();
             if (chk.checkUnique(tree.pos(), m, enclScope)) {
             enclScope.enter(m);
             }
             annotateLater(tree.mods.annotations, localEnv, m, tree.pos());
             // Visit the signature of the method. Note that
             // TypeAnnotate doesn't descend into the body.
             typeAnnotate(tree, localEnv, m, tree.pos());
             if (tree.defaultValue != null)
                 annotateDefaultValueLater(tree.defaultValue, localEnv, m);
         } finally {
             annotate.enterDone();
         }
     }
     /** Create a fresh environment for method bodies.
      *  @param tree     The method definition.
      *  @param env      The environment current outside of the method definition.
      */
     Env<AttrContext> methodEnv(JCMethodDecl tree, Env<AttrContext> env) {
         Env<AttrContext> localEnv =
             env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
         localEnv.enclMethod = tree;
         localEnv.info.scope.owner = tree.sym;
         if (tree.sym.type != null) {
             //when this is called in the enter stage, there's no type to be set
             localEnv.info.returnResult = attr.new ResultInfo(VAL, tree.sym.type.getReturnType());
         }
         if ((tree.mods.flags & STATIC) != 0) localEnv.info.staticLevel++;
         return localEnv;
     }
     public void visitVarDef(JCVariableDecl tree) {
         Env<AttrContext> localEnv = env;
         if ((tree.mods.flags & STATIC) != 0 ||
             (env.info.scope.owner.flags() & INTERFACE) != 0) {
             localEnv = env.dup(tree, env.info.dup());
             localEnv.info.staticLevel++;
         }
         DiagnosticPosition prevLintPos = deferredLintHandler.setPos(tree.pos());
         annotate.enterStart();
         try {
             try {
                 if (TreeInfo.isEnumInit(tree)) {
                     attr.attribIdentAsEnumType(localEnv, (JCIdent)tree.vartype);
                 } else {
                     attr.attribType(tree.vartype, localEnv);
                     if (tree.nameexpr != null) {
                         attr.attribExpr(tree.nameexpr, localEnv);
                         MethodSymbol m = localEnv.enclMethod.sym;
                         if (m.isConstructor()) {
                             Type outertype = m.owner.owner.type;
                             if (outertype.hasTag(TypeTag.CLASS)) {
                                 checkType(tree.vartype, outertype, "incorrect.constructor.receiver.type");
                                 checkType(tree.nameexpr, outertype, "incorrect.constructor.receiver.name");
                             } else {
                                 log.error(tree, "receiver.parameter.not.applicable.constructor.toplevel.class");
                             }
                         } else {
                             checkType(tree.vartype, m.owner.type, "incorrect.receiver.type");
                             checkType(tree.nameexpr, m.owner.type, "incorrect.receiver.name");
                         }
                     }
                 }
             } finally {
                 deferredLintHandler.setPos(prevLintPos);
             }
             if ((tree.mods.flags & VARARGS) != 0) {
                 //if we are entering a varargs parameter, we need to
                 //replace its type (a plain array type) with the more
                 //precise VarargsType --- we need to do it this way
                 //because varargs is represented in the tree as a
                 //modifier on the parameter declaration, and not as a
                 //distinct type of array node.
                 ArrayType atype = (ArrayType)tree.vartype.type.unannotatedType();
                 tree.vartype.type = atype.makeVarargs();
             }
             Scope enclScope = enter.enterScope(env);
             VarSymbol v =
                 new VarSymbol(0, tree.name, tree.vartype.type, enclScope.owner);
             v.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, v, tree);
             tree.sym = v;
             if (tree.init != null) {
                 v.flags_field |= HASINIT;
                 if ((v.flags_field & FINAL) != 0 &&
                     needsLazyConstValue(tree.init)) {
                     Env<AttrContext> initEnv = getInitEnv(tree, env);
                     initEnv.info.enclVar = v;
                     v.setLazyConstValue(initEnv(tree, initEnv), attr, tree);
                 }
             }
             if (chk.checkUnique(tree.pos(), v, enclScope)) {
                 chk.checkTransparentVar(tree.pos(), v, enclScope);
                 enclScope.enter(v);
             }
             annotateLater(tree.mods.annotations, localEnv, v, tree.pos());
             typeAnnotate(tree.vartype, env, v, tree.pos());
             v.pos = tree.pos;
         } finally {
             annotate.enterDone();
         }
     }
     // where
     void checkType(JCTree tree, Type type, String diag) {
         if (!tree.type.isErroneous() && !types.isSameType(tree.type, type)) {
             log.error(tree, diag, type, tree.type);
         }
     }
     public boolean needsLazyConstValue(JCTree tree) {
         InitTreeVisitor initTreeVisitor = new InitTreeVisitor();
         tree.accept(initTreeVisitor);
         return initTreeVisitor.result;
     }
     /** Visitor class for expressions which might be constant expressions.
      */
     static class InitTreeVisitor extends JCTree.Visitor {
         private boolean result = true;
         @Override
         public void visitTree(JCTree tree) {}
         @Override
         public void visitNewClass(JCNewClass that) {
             result = false;
         }
         @Override
         public void visitNewArray(JCNewArray that) {
             result = false;
         }
         @Override
         public void visitLambda(JCLambda that) {
             result = false;
         }
         @Override
         public void visitReference(JCMemberReference that) {
             result = false;
         }
         @Override
         public void visitApply(JCMethodInvocation that) {
             result = false;
         }
         @Override
         public void visitSelect(JCFieldAccess tree) {
             tree.selected.accept(this);
         }
         @Override
         public void visitConditional(JCConditional tree) {
             tree.cond.accept(this);
             tree.truepart.accept(this);
             tree.falsepart.accept(this);
         }
         @Override
         public void visitParens(JCParens tree) {
             tree.expr.accept(this);
         }
         @Override
         public void visitTypeCast(JCTypeCast tree) {
             tree.expr.accept(this);
         }
     }
     /** Create a fresh environment for a variable's initializer.
      *  If the variable is a field, the owner of the environment's scope
      *  is be the variable itself, otherwise the owner is the method
      *  enclosing the variable definition.
      *
      *  @param tree     The variable definition.
      *  @param env      The environment current outside of the variable definition.
      */
     Env<AttrContext> initEnv(JCVariableDecl tree, Env<AttrContext> env) {
         Env<AttrContext> localEnv = env.dupto(new AttrContextEnv(tree, env.info.dup()));
         if (tree.sym.owner.kind == TYP) {
             localEnv.info.scope = env.info.scope.dupUnshared();
             localEnv.info.scope.owner = tree.sym;
         }
         if ((tree.mods.flags & STATIC) != 0 ||
                 ((env.enclClass.sym.flags() & INTERFACE) != 0 && env.enclMethod == null))
             localEnv.info.staticLevel++;
         return localEnv;
     }
     /** Default member enter visitor method: do nothing
      */
     public void visitTree(JCTree tree) {
     }
     public void visitErroneous(JCErroneous tree) {
         if (tree.errs != null)
             memberEnter(tree.errs, env);
     }
     public Env<AttrContext> getMethodEnv(JCMethodDecl tree, Env<AttrContext> env) {
         Env<AttrContext> mEnv = methodEnv(tree, env);
         mEnv.info.lint = mEnv.info.lint.augment(tree.sym);
         for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
             mEnv.info.scope.enterIfAbsent(l.head.type.tsym);
         for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail)
             mEnv.info.scope.enterIfAbsent(l.head.sym);
         return mEnv;
     }
     public Env<AttrContext> getInitEnv(JCVariableDecl tree, Env<AttrContext> env) {
         Env<AttrContext> iEnv = initEnv(tree, env);
         return iEnv;
     }
 /* ********************************************************************
  * Type completion
  *********************************************************************/
     Type attribImportType(JCTree tree, Env<AttrContext> env) {
         Assert.check(completionEnabled);
         try {
             // To prevent deep recursion, suppress completion of some
             // types.
             completionEnabled = false;
             return attr.attribType(tree, env);
         } finally {
             completionEnabled = true;
         }
     }
 /* ********************************************************************
  * Annotation processing
  *********************************************************************/
     /** Queue annotations for later processing. */
     void annotateLater(final List<JCAnnotation> annotations,
                        final Env<AttrContext> localEnv,
                        final Symbol s,
                        final DiagnosticPosition deferPos) {
         if (annotations.isEmpty()) {
             return;
         }
         if (s.kind != PCK) {
             s.resetAnnotations(); // mark Annotations as incomplete for now
         }
         annotate.normal(new Annotate.Worker() {
                 @Override
                 public String toString() {
                     return "annotate " + annotations + " onto " + s + " in " + s.owner;
                 }
                 @Override
                 public void run() {
                     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,
                                       "already.annotated",
                                       kindName(s), s);
                         actualEnterAnnotations(annotations, localEnv, s);
                     } finally {
                         if (prevLint != null)
                             chk.setLint(prevLint);
                         deferredLintHandler.setPos(prevLintPos);
                         log.useSource(prev);
                     }
                 }
             });
         annotate.validate(new Annotate.Worker() { //validate annotations
             @Override
             public void run() {
                 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
                 try {
                     chk.validateAnnotations(annotations, s);
                 } finally {
                     log.useSource(prev);
                 }
             }
         });
     }
     /**
      * Check if a list of annotations contains a reference to
      * java.lang.Deprecated.
      **/
     private boolean hasDeprecatedAnnotation(List<JCAnnotation> annotations) {
         for (List<JCAnnotation> al = annotations; !al.isEmpty(); al = al.tail) {
             JCAnnotation a = al.head;
             if (a.annotationType.type == syms.deprecatedType && a.args.isEmpty())
                 return true;
         }
         return false;
     }
     /** Enter a set of annotations. */
     private void actualEnterAnnotations(List<JCAnnotation> annotations,
                           Env<AttrContext> env,
                           Symbol s) {
         Map<TypeSymbol, ListBuffer<Attribute.Compound>> annotated =
                 new LinkedHashMap<TypeSymbol, ListBuffer<Attribute.Compound>>();
         Map<Attribute.Compound, DiagnosticPosition> pos =
                 new HashMap<Attribute.Compound, DiagnosticPosition>();
         for (List<JCAnnotation> al = annotations; !al.isEmpty(); al = al.tail) {
             JCAnnotation a = al.head;
             Attribute.Compound c = annotate.enterAnnotation(a,
                                                             syms.annotationType,
                                                             env);
             if (c == null) {
                 continue;
             }
             if (annotated.containsKey(a.type.tsym)) {
                 if (!allowRepeatedAnnos) {
                     log.error(a.pos(), "repeatable.annotations.not.supported.in.source");
                     allowRepeatedAnnos = true;
                 }
                 ListBuffer<Attribute.Compound> 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()
                 && s.owner.kind != MTH
                 && types.isSameType(c.type, syms.deprecatedType)) {
                 s.flags_field |= Flags.DEPRECATED;
             }
         }
         s.setDeclarationAttributesWithCompletion(
                 annotate.new AnnotateRepeatedContext<Attribute.Compound>(env, annotated, pos, log, false));
     }
     /** Queue processing of an attribute default value. */
     void annotateDefaultValueLater(final JCExpression defaultValue,
                                    final Env<AttrContext> localEnv,
                                    final MethodSymbol m) {
         annotate.normal(new Annotate.Worker() {
                 @Override
                 public String toString() {
                     return "annotate " + m.owner + "." +
                         m + " default " + defaultValue;
                 }
                 @Override
                 public void run() {
                     JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
                     try {
                         enterDefaultValue(defaultValue, localEnv, m);
                     } finally {
                         log.useSource(prev);
                     }
                 }
             });
         annotate.validate(new Annotate.Worker() { //validate annotations
             @Override
             public void run() {
                 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 attribute method. */
     private void enterDefaultValue(final JCExpression defaultValue,
                                    final Env<AttrContext> localEnv,
                                    final MethodSymbol m) {
         m.defaultValue = annotate.enterAttributeValue(m.type.getReturnType(),
                                                       defaultValue,
                                                       localEnv);
     }
 /* ********************************************************************
  * Source completer
  *********************************************************************/
     /** Complete entering a class.
      *  @param sym         The symbol of the class to be completed.
      */
     public void complete(Symbol sym) throws CompletionFailure {
         // Suppress some (recursive) MemberEnter invocations
         if (!completionEnabled) {
             // Re-install same completer for next time around and return.
             Assert.check((sym.flags() & Flags.COMPOUND) == 0);
             sym.completer = this;
             return;
         }
         ClassSymbol c = (ClassSymbol)sym;
         ClassType ct = (ClassType)c.type;
         Env<AttrContext> env = enter.typeEnvs.get(c);
         JCClassDecl tree = (JCClassDecl)env.tree;
         boolean wasFirst = isFirst;
         isFirst = false;
         JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
         DiagnosticPosition prevLintPos = deferredLintHandler.setPos(tree.pos());
         try {
             // Save class environment for later member enter (2) processing.
             halfcompleted.append(env);
             // Mark class as not yet attributed.
             c.flags_field |= UNATTRIBUTED;
             // If this is a toplevel-class, make sure any preceding import
             // clauses have been seen.
             if (c.owner.kind == PCK) {
                 memberEnter(env.toplevel, env.enclosing(TOPLEVEL));
                 todo.append(env);
             }
             if (c.owner.kind == TYP)
                 c.owner.complete();
             // create an environment for evaluating the base clauses
             Env<AttrContext> baseEnv = baseEnv(tree, env);
             if (tree.extending != null)
                 typeAnnotate(tree.extending, baseEnv, sym, tree.pos());
             for (JCExpression impl : tree.implementing)
                 typeAnnotate(impl, baseEnv, sym, tree.pos());
             annotate.flush();
             // Determine supertype.
             Type supertype =
                 (tree.extending != null)
                 ? attr.attribBase(tree.extending, baseEnv, true, false, true)
                 : ((tree.mods.flags & Flags.ENUM) != 0)
                 ? attr.attribBase(enumBase(tree.pos, c), baseEnv,
                                   true, false, false)
                 : (c.fullname == names.java_lang_Object)
                 ? Type.noType
                 : syms.objectType;
             ct.supertype_field = modelMissingTypes(supertype, tree.extending, false);
             // Determine interfaces.
             ListBuffer<Type> interfaces = new ListBuffer<Type>();
             ListBuffer<Type> all_interfaces = null; // lazy init
             Set<Type> interfaceSet = new HashSet<Type>();
             List<JCExpression> interfaceTrees = tree.implementing;
             for (JCExpression iface : interfaceTrees) {
                 Type i = attr.attribBase(iface, baseEnv, false, true, true);
                 if (i.hasTag(CLASS)) {
                     interfaces.append(i);
                     if (all_interfaces != null) all_interfaces.append(i);
                     chk.checkNotRepeated(iface.pos(), types.erasure(i), interfaceSet);
                 } else {
                     if (all_interfaces == null)
                         all_interfaces = new ListBuffer<Type>().appendList(interfaces);
                     all_interfaces.append(modelMissingTypes(i, iface, true));
                 }
             }
             if ((c.flags_field & ANNOTATION) != 0) {
                 ct.interfaces_field = List.of(syms.annotationType);
                 ct.all_interfaces_field = ct.interfaces_field;
             }  else {
                 ct.interfaces_field = interfaces.toList();
                 ct.all_interfaces_field = (all_interfaces == null)
                         ? ct.interfaces_field : all_interfaces.toList();
             }
             if (c.fullname == names.java_lang_Object) {
                 if (tree.extending != null) {
                     chk.checkNonCyclic(tree.extending.pos(),
                                        supertype);
                     ct.supertype_field = Type.noType;
                 }
                 else if (tree.implementing.nonEmpty()) {
                     chk.checkNonCyclic(tree.implementing.head.pos(),
                                        ct.interfaces_field.head);
                     ct.interfaces_field = List.nil();
                 }
             }
             // Annotations.
             // In general, we cannot fully process annotations yet,  but we
             // can attribute the annotation types and then check to see if the
             // @Deprecated annotation is present.
             attr.attribAnnotationTypes(tree.mods.annotations, baseEnv);
             if (hasDeprecatedAnnotation(tree.mods.annotations))
                 c.flags_field |= DEPRECATED;
             annotateLater(tree.mods.annotations, baseEnv, c, tree.pos());
             // class type parameters use baseEnv but everything uses env
             chk.checkNonCyclicDecl(tree);
             attr.attribTypeVariables(tree.typarams, baseEnv);
             // Do this here, where we have the symbol.
             for (JCTypeParameter tp : tree.typarams)
                 typeAnnotate(tp, baseEnv, sym, tree.pos());
             // Add default constructor if needed.
             if ((c.flags() & INTERFACE) == 0 &&
                 !TreeInfo.hasConstructors(tree.defs)) {
                 List<Type> argtypes = List.nil();
                 List<Type> typarams = List.nil();
                 List<Type> thrown = List.nil();
                 long ctorFlags = 0;
                 boolean based = false;
                 boolean addConstructor = true;
                 JCNewClass nc = null;
                 if (c.name.isEmpty()) {
                     nc = (JCNewClass)env.next.tree;
                     if (nc.constructor != null) {
                         addConstructor = nc.constructor.kind != ERR;
                         Type superConstrType = types.memberType(c.type,
                                                                 nc.constructor);
                         argtypes = superConstrType.getParameterTypes();
                         typarams = superConstrType.getTypeArguments();
                         ctorFlags = nc.constructor.flags() & VARARGS;
                         if (nc.encl != null) {
                             argtypes = argtypes.prepend(nc.encl.type);
                             based = true;
                         }
                         thrown = superConstrType.getThrownTypes();
                     }
                 }
                 if (addConstructor) {
                     MethodSymbol basedConstructor = nc != null ?
                             (MethodSymbol)nc.constructor : null;
                     JCTree constrDef = DefaultConstructor(make.at(tree.pos), c,
                                                         basedConstructor,
                                                         typarams, argtypes, thrown,
                                                         ctorFlags, based);
                     tree.defs = tree.defs.prepend(constrDef);
                 }
             }
             // enter symbols for 'this' into current scope.
             VarSymbol thisSym =
                 new VarSymbol(FINAL | HASINIT, names._this, c.type, c);
             thisSym.pos = Position.FIRSTPOS;
             env.info.scope.enter(thisSym);
             // if this is a class, enter symbol for 'super' into current scope.
             if ((c.flags_field & INTERFACE) == 0 &&
                     ct.supertype_field.hasTag(CLASS)) {
                 VarSymbol superSym =
                     new VarSymbol(FINAL | HASINIT, names._super,
                                   ct.supertype_field, c);
                 superSym.pos = Position.FIRSTPOS;
                 env.info.scope.enter(superSym);
             }
             // check that no package exists with same fully qualified name,
             // but admit classes in the unnamed package which have the same
             // name as a top-level package.
             if (checkClash &&
                 c.owner.kind == PCK && c.owner != syms.unnamedPackage &&
                 reader.packageExists(c.fullname)) {
                 log.error(tree.pos, "clash.with.pkg.of.same.name", Kinds.kindName(sym), c);
             }
             if (c.owner.kind == PCK && (c.flags_field & PUBLIC) == 0 &&
                 !env.toplevel.sourcefile.isNameCompatible(c.name.toString(),JavaFileObject.Kind.SOURCE)) {
                 c.flags_field |= AUXILIARY;
             }
         } catch (CompletionFailure ex) {
             chk.completionError(tree.pos(), ex);
         } finally {
             deferredLintHandler.setPos(prevLintPos);
             log.useSource(prev);
         }
         // Enter all member fields and methods of a set of half completed
         // classes in a second phase.
         if (wasFirst) {
             try {
                 while (halfcompleted.nonEmpty()) {
                     Env<AttrContext> toFinish = halfcompleted.next();
                     finish(toFinish);
                     if (allowTypeAnnos) {
                         typeAnnotations.organizeTypeAnnotationsSignatures(toFinish, (JCClassDecl)toFinish.tree);
                         typeAnnotations.validateTypeAnnotationsSignatures(toFinish, (JCClassDecl)toFinish.tree);
                     }
                 }
             } finally {
                 isFirst = true;
             }
         }
     }
     /*
      * If the symbol is non-null, attach the type annotation to it.
      */
     private void actualEnterTypeAnnotations(final List<JCAnnotation> annotations,
             final Env<AttrContext> env,
             final Symbol s) {
         Map<TypeSymbol, ListBuffer<Attribute.TypeCompound>> annotated =
                 new LinkedHashMap<TypeSymbol, ListBuffer<Attribute.TypeCompound>>();
         Map<Attribute.TypeCompound, DiagnosticPosition> pos =
                 new HashMap<Attribute.TypeCompound, DiagnosticPosition>();
         for (List<JCAnnotation> al = annotations; !al.isEmpty(); al = al.tail) {
             JCAnnotation a = al.head;
             Attribute.TypeCompound tc = annotate.enterTypeAnnotation(a,
                     syms.annotationType,
                     env);
             if (tc == null) {
                 continue;
             }
             if (annotated.containsKey(a.type.tsym)) {
                 if (source.allowRepeatedAnnotations()) {
                     ListBuffer<Attribute.TypeCompound> l = annotated.get(a.type.tsym);
                     l = l.append(tc);
                     annotated.put(a.type.tsym, l);
                     pos.put(tc, a.pos());
                 } else {
                     log.error(a.pos(), "repeatable.annotations.not.supported.in.source");
                 }
             } else {
                 annotated.put(a.type.tsym, ListBuffer.of(tc));
                 pos.put(tc, a.pos());
             }
         }
         if (s != null) {
             s.appendTypeAttributesWithCompletion(
                     annotate.new AnnotateRepeatedContext<Attribute.TypeCompound>(env, annotated, pos, log, true));
         }
     }
     public void typeAnnotate(final JCTree tree, final Env<AttrContext> env, final Symbol sym, DiagnosticPosition deferPos) {
         if (allowTypeAnnos) {
             tree.accept(new TypeAnnotate(env, sym, deferPos));
         }
     }
     /**
      * 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 Env<AttrContext> env;
         private Symbol sym;
         private DiagnosticPosition deferPos;
         public TypeAnnotate(final Env<AttrContext> env, final Symbol sym, DiagnosticPosition deferPos) {
             this.env = env;
             this.sym = sym;
             this.deferPos = deferPos;
         }
         void annotateTypeLater(final List<JCAnnotation> annotations) {
             if (annotations.isEmpty()) {
                 return;
             }
             final DiagnosticPosition deferPos = this.deferPos;
             annotate.normal(new Annotate.Worker() {
                 @Override
                 public String toString() {
                     return "type annotate " + annotations + " onto " + sym + " in " + sym.owner;
                 }
                 @Override
                 public void run() {
                     JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
                     DiagnosticPosition prevLintPos = null;
                     if (deferPos != null) {
                         prevLintPos = deferredLintHandler.setPos(deferPos);
                     }
                     try {
                         actualEnterTypeAnnotations(annotations, env, sym);
                     } finally {
                         if (prevLintPos != null)
                             deferredLintHandler.setPos(prevLintPos);
                         log.useSource(prev);
                     }
                 }
             });
         }
         @Override
         public void visitAnnotatedType(final JCAnnotatedType tree) {
             annotateTypeLater(tree.annotations);
             super.visitAnnotatedType(tree);
         }
         @Override
         public void visitTypeParameter(final JCTypeParameter tree) {
             annotateTypeLater(tree.annotations);
             super.visitTypeParameter(tree);
         }
         @Override
         public void visitNewArray(final JCNewArray tree) {
             annotateTypeLater(tree.annotations);
             for (List<JCAnnotation> dimAnnos : tree.dimAnnotations)
                 annotateTypeLater(dimAnnos);
             super.visitNewArray(tree);
         }
         @Override
         public void visitMethodDef(final 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.
             // scan(tree.body);
         }
         @Override
         public void visitVarDef(final JCVariableDecl tree) {
             DiagnosticPosition prevPos = deferPos;
             deferPos = tree.pos();
             try {
                 if (sym != null && sym.kind == Kinds.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 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) {
             if (tree.def == null) {
                 // For an anonymous class instantiation the class
                 // will be visited separately.
                 super.visitNewClass(tree);
             }
         }
     }
     private Env<AttrContext> baseEnv(JCClassDecl tree, Env<AttrContext> env) {
         Scope baseScope = new Scope(tree.sym);
         //import already entered local classes into base scope
         for (Scope.Entry e = env.outer.info.scope.elems ; e != null ; e = e.sibling) {
             if (e.sym.isLocal()) {
                 baseScope.enter(e.sym);
             }
         }
         //import current type-parameters into base scope
         if (tree.typarams != null)
             for (List<JCTypeParameter> typarams = tree.typarams;
                  typarams.nonEmpty();
                  typarams = typarams.tail)
                 baseScope.enter(typarams.head.type.tsym);
         Env<AttrContext> outer = env.outer; // the base clause can't see members of this class
         Env<AttrContext> localEnv = outer.dup(tree, outer.info.dup(baseScope));
         localEnv.baseClause = true;
         localEnv.outer = outer;
         localEnv.info.isSelfCall = false;
         return localEnv;
     }
     /** Enter member fields and methods of a class
      *  @param env        the environment current for the class block.
      */
     private void finish(Env<AttrContext> env) {
         JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
         try {
             JCClassDecl tree = (JCClassDecl)env.tree;
             finishClass(tree, env);
         } finally {
             log.useSource(prev);
         }
     }
     /** Generate a base clause for an enum type.
      *  @param pos              The position for trees and diagnostics, if any
      *  @param c                The class symbol of the enum
      */
     private JCExpression enumBase(int pos, ClassSymbol c) {
         JCExpression result = make.at(pos).
             TypeApply(make.QualIdent(syms.enumSym),
                       List.<JCExpression>of(make.Type(c.type)));
         return result;
     }
     Type modelMissingTypes(Type t, final JCExpression tree, final boolean interfaceExpected) {
         if (!t.hasTag(ERROR))
             return t;
         return new ErrorType(t.getOriginalType(), t.tsym) {
             private Type modelType;
             @Override
             public Type getModelType() {
                 if (modelType == null)
                     modelType = new Synthesizer(getOriginalType(), interfaceExpected).visit(tree);
                 return modelType;
             }
         };
     }
     // where
     private class Synthesizer extends JCTree.Visitor {
         Type originalType;
         boolean interfaceExpected;
         List<ClassSymbol> synthesizedSymbols = List.nil();
         Type result;
         Synthesizer(Type originalType, boolean interfaceExpected) {
             this.originalType = originalType;
             this.interfaceExpected = interfaceExpected;
         }
         Type visit(JCTree tree) {
             tree.accept(this);
             return result;
         }
         List<Type> visit(List<? extends JCTree> trees) {
             ListBuffer<Type> lb = new ListBuffer<Type>();
             for (JCTree t: trees)
                 lb.append(visit(t));
             return lb.toList();
         }
         @Override
         public void visitTree(JCTree tree) {
             result = syms.errType;
         }
         @Override
         public void visitIdent(JCIdent tree) {
             if (!tree.type.hasTag(ERROR)) {
                 result = tree.type;
             } else {
                 result = synthesizeClass(tree.name, syms.unnamedPackage).type;
             }
         }
         @Override
         public void visitSelect(JCFieldAccess tree) {
             if (!tree.type.hasTag(ERROR)) {
                 result = tree.type;
             } else {
                 Type selectedType;
                 boolean prev = interfaceExpected;
                 try {
                     interfaceExpected = false;
                     selectedType = visit(tree.selected);
                 } finally {
                     interfaceExpected = prev;
                 }
                 ClassSymbol c = synthesizeClass(tree.name, selectedType.tsym);
                 result = c.type;
             }
         }
         @Override
         public void visitTypeApply(JCTypeApply tree) {
             if (!tree.type.hasTag(ERROR)) {
                 result = tree.type;
             } else {
                 ClassType clazzType = (ClassType) visit(tree.clazz);
                 if (synthesizedSymbols.contains(clazzType.tsym))
                     synthesizeTyparams((ClassSymbol) clazzType.tsym, tree.arguments.size());
                 final List<Type> actuals = visit(tree.arguments);
                 result = new ErrorType(tree.type, clazzType.tsym) {
                     @Override
                     public List<Type> getTypeArguments() {
                         return actuals;
                     }
                 };
             }
         }
         ClassSymbol synthesizeClass(Name name, Symbol owner) {
             int flags = interfaceExpected ? INTERFACE : 0;
             ClassSymbol c = new ClassSymbol(flags, name, owner);
             c.members_field = new Scope.ErrorScope(c);
             c.type = new ErrorType(originalType, c) {
                 @Override
                 public List<Type> getTypeArguments() {
                     return typarams_field;
                 }
             };
             synthesizedSymbols = synthesizedSymbols.prepend(c);
             return c;
         }
         void synthesizeTyparams(ClassSymbol sym, int n) {
             ClassType ct = (ClassType) sym.type;
             Assert.check(ct.typarams_field.isEmpty());
             if (n == 1) {
                 TypeVar v = new TypeVar(names.fromString("T"), sym, syms.botType);
                 ct.typarams_field = ct.typarams_field.prepend(v);
             } else {
                 for (int i = n; i > 0; i--) {
                     TypeVar v = new TypeVar(names.fromString("T" + i), sym, syms.botType);
                     ct.typarams_field = ct.typarams_field.prepend(v);
                 }
             }
         }
     }
 /* ***************************************************************************
  * tree building
  ****************************************************************************/
     /** Generate default constructor for given class. For classes different
      *  from java.lang.Object, this is:
      *
      *    c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
      *      super(x_0, ..., x_n)
      *    }
      *
      *  or, if based == true:
      *
      *    c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
      *      x_0.super(x_1, ..., x_n)
      *    }
      *
      *  @param make     The tree factory.
      *  @param c        The class owning the default constructor.
      *  @param argtypes The parameter types of the constructor.
      *  @param thrown   The thrown exceptions of the constructor.
      *  @param based    Is first parameter a this$n?
      */
     JCTree DefaultConstructor(TreeMaker make,
                             ClassSymbol c,
                             MethodSymbol baseInit,
                             List<Type> typarams,
                             List<Type> argtypes,
                             List<Type> thrown,
                             long flags,
                             boolean based) {
         JCTree result;
         if ((c.flags() & ENUM) != 0 &&
             (types.supertype(c.type).tsym == syms.enumSym)) {
             // constructors of true enums are private
             flags = (flags & ~AccessFlags) | PRIVATE | GENERATEDCONSTR;
         } else
             flags |= (c.flags() & AccessFlags) | GENERATEDCONSTR;
         if (c.name.isEmpty()) {
             flags |= ANONCONSTR;
         }
         Type mType = new MethodType(argtypes, null, thrown, c);
         Type initType = typarams.nonEmpty() ?
                 new ForAll(typarams, mType) :
                 mType;
         MethodSymbol init = new MethodSymbol(flags, names.init,
                 initType, c);
         init.params = createDefaultConstructorParams(make, baseInit, init,
                 argtypes, based);
         List<JCVariableDecl> params = make.Params(argtypes, init);
         List<JCStatement> stats = List.nil();
         if (c.type != syms.objectType) {
             stats = stats.prepend(SuperCall(make, typarams, params, based));
         }
         result = make.MethodDef(init, make.Block(0, stats));
         return result;
     }
     private List<VarSymbol> createDefaultConstructorParams(
             TreeMaker make,
             MethodSymbol baseInit,
             MethodSymbol init,
             List<Type> argtypes,
             boolean based) {
         List<VarSymbol> initParams = null;
         List<Type> argTypesList = argtypes;
         if (based) {
             /*  In this case argtypes will have an extra type, compared to baseInit,
              *  corresponding to the type of the enclosing instance i.e.:
              *
              *  Inner i = outer.new Inner(1){}
              *
              *  in the above example argtypes will be (Outer, int) and baseInit
              *  will have parameter's types (int). So in this case we have to add
              *  first the extra type in argtypes and then get the names of the
              *  parameters from baseInit.
              */
             initParams = List.nil();
             VarSymbol param = new VarSymbol(PARAMETER, make.paramName(0), argtypes.head, init);
             initParams = initParams.append(param);
             argTypesList = argTypesList.tail;
         }
         if (baseInit != null && baseInit.params != null &&
             baseInit.params.nonEmpty() && argTypesList.nonEmpty()) {
             initParams = (initParams == null) ? List.<VarSymbol>nil() : initParams;
             List<VarSymbol> baseInitParams = baseInit.params;
             while (baseInitParams.nonEmpty() && argTypesList.nonEmpty()) {
                 VarSymbol param = new VarSymbol(baseInitParams.head.flags() | PARAMETER,
                         baseInitParams.head.name, argTypesList.head, init);
                 initParams = initParams.append(param);
                 baseInitParams = baseInitParams.tail;
                 argTypesList = argTypesList.tail;
             }
         }
         return initParams;
     }
     /** Generate call to superclass constructor. This is:
      *
      *    super(id_0, ..., id_n)
      *
      * or, if based == true
      *
      *    id_0.super(id_1,...,id_n)
      *
      *  where id_0, ..., id_n are the names of the given parameters.
      *
      *  @param make    The tree factory
      *  @param params  The parameters that need to be passed to super
      *  @param typarams  The type parameters that need to be passed to super
      *  @param based   Is first parameter a this$n?
      */
     JCExpressionStatement SuperCall(TreeMaker make,
                    List<Type> typarams,
                    List<JCVariableDecl> params,
                    boolean based) {
         JCExpression meth;
         if (based) {
             meth = make.Select(make.Ident(params.head), names._super);
             params = params.tail;
         } else {
             meth = make.Ident(names._super);
         }
         List<JCExpression> typeargs = typarams.nonEmpty() ? make.Types(typarams) : null;
         return make.Exec(make.Apply(typeargs, meth, make.Idents(params)));
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/comp/MemberEnter.java@8b4e1421a9b7 (annotated)

src/share/classes/com/sun/tools/javac/comp/MemberEnter.java