jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/comp/Enter.java@7755f47542a0 (annotated)

src/share/classes/com/sun/tools/javac/comp/Enter.java@7755f47542a0 (annotated)

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

Tue, 26 Oct 2010 14:29:48 -0700

author: jjg
date: Tue, 26 Oct 2010 14:29:48 -0700
changeset 724: 7755f47542a0
parent 688: 50f9ac2f4730
child 767: 7e3e9f6d013f
permissions: -rw-r--r--

6949587: rename "DisjointType" to "DisjunctType"
Reviewed-by: mcimadamore

 /*
  * Copyright (c) 1999, 2008, 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.*;
 import javax.tools.JavaFileObject;
 import javax.tools.JavaFileManager;
 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.util.JCDiagnostic.DiagnosticPosition;
 import com.sun.tools.javac.util.List;
 import com.sun.tools.javac.code.Type.*;
 import com.sun.tools.javac.code.Symbol.*;
 import com.sun.tools.javac.main.RecognizedOptions.PkgInfo;
 import com.sun.tools.javac.tree.JCTree.*;
 import static com.sun.tools.javac.code.Flags.*;
 import static com.sun.tools.javac.code.Kinds.*;
 /** This class enters symbols for all encountered definitions into
  *  the symbol table. The pass consists of two phases, organized as
  *  follows:
  *
  *  <p>In the first phase, all class symbols are intered into their
  *  enclosing scope, descending recursively down the tree for classes
  *  which are members of other classes. The class symbols are given a
  *  MemberEnter object as completer.
  *
  *  <p>In the second phase classes are completed using
  *  MemberEnter.complete().  Completion might occur on demand, but
  *  any classes that are not completed that way will be eventually
  *  completed by processing the `uncompleted' queue.  Completion
  *  entails (1) determination of a class's parameters, supertype and
  *  interfaces, as well as (2) entering all symbols defined in the
  *  class into its scope, with the exception of class symbols which
  *  have been entered in phase 1.  (2) depends on (1) having been
  *  completed for a class and all its superclasses and enclosing
  *  classes. That's why, after doing (1), we put classes in a
  *  `halfcompleted' queue. Only when we have performed (1) for a class
  *  and all it's superclasses and enclosing classes, we proceed to
  *  (2).
  *
  *  <p>Whereas the first phase is organized as a sweep through all
  *  compiled syntax trees, the second phase is demand. Members of a
  *  class are entered when the contents of a class are first
  *  accessed. This is accomplished by installing completer objects in
  *  class symbols for compiled classes which invoke the member-enter
  *  phase for the corresponding class tree.
  *
  *  <p>Classes migrate from one phase to the next via queues:
  *
  *  <pre>
  *  class enter -> (Enter.uncompleted)         --> member enter (1)
  *              -> (MemberEnter.halfcompleted) --> member enter (2)
  *              -> (Todo)                      --> attribute
  *                                              (only for toplevel classes)
  *  </pre>
  *
  *  <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 Enter extends JCTree.Visitor {
     protected static final Context.Key<Enter> enterKey =
         new Context.Key<Enter>();
     Log log;
     Symtab syms;
     Scope.ScopeCounter scopeCounter;
     Check chk;
     TreeMaker make;
     ClassReader reader;
     Annotate annotate;
     MemberEnter memberEnter;
     Types types;
     Lint lint;
     Names names;
     JavaFileManager fileManager;
     PkgInfo pkginfoOpt;
     private final Todo todo;
     public static Enter instance(Context context) {
         Enter instance = context.get(enterKey);
         if (instance == null)
             instance = new Enter(context);
         return instance;
     }
     protected Enter(Context context) {
         context.put(enterKey, this);
         log = Log.instance(context);
         reader = ClassReader.instance(context);
         make = TreeMaker.instance(context);
         syms = Symtab.instance(context);
         scopeCounter = Scope.ScopeCounter.instance(context);
         chk = Check.instance(context);
         memberEnter = MemberEnter.instance(context);
         types = Types.instance(context);
         annotate = Annotate.instance(context);
         lint = Lint.instance(context);
         names = Names.instance(context);
         predefClassDef = make.ClassDef(
             make.Modifiers(PUBLIC),
             syms.predefClass.name, null, null, null, null);
         predefClassDef.sym = syms.predefClass;
         todo = Todo.instance(context);
         fileManager = context.get(JavaFileManager.class);
         Options options = Options.instance(context);
         pkginfoOpt = PkgInfo.get(options);
     }
     /** A hashtable mapping classes and packages to the environments current
      *  at the points of their definitions.
      */
     Map<TypeSymbol,Env<AttrContext>> typeEnvs =
             new HashMap<TypeSymbol,Env<AttrContext>>();
     /** Accessor for typeEnvs
      */
     public Env<AttrContext> getEnv(TypeSymbol sym) {
         return typeEnvs.get(sym);
     }
     public Env<AttrContext> getClassEnv(TypeSymbol sym) {
         Env<AttrContext> localEnv = getEnv(sym);
         Env<AttrContext> lintEnv = localEnv;
         while (lintEnv.info.lint == null)
             lintEnv = lintEnv.next;
         localEnv.info.lint = lintEnv.info.lint.augment(sym.attributes_field, sym.flags());
         return localEnv;
     }
     /** The queue of all classes that might still need to be completed;
      *  saved and initialized by main().
      */
     ListBuffer<ClassSymbol> uncompleted;
     /** A dummy class to serve as enclClass for toplevel environments.
      */
     private JCClassDecl predefClassDef;
 /* ************************************************************************
  * environment construction
  *************************************************************************/
     /** Create a fresh environment for class bodies.
      *  This will create a fresh scope for local symbols of a class, referred
      *  to by the environments info.scope field.
      *  This scope will contain
      *    - symbols for this and super
      *    - symbols for any type parameters
      *  In addition, it serves as an anchor for scopes of methods and initializers
      *  which are nested in this scope via Scope.dup().
      *  This scope should not be confused with the members scope of a class.
      *
      *  @param tree     The class definition.
      *  @param env      The environment current outside of the class definition.
      */
     public Env<AttrContext> classEnv(JCClassDecl tree, Env<AttrContext> env) {
         Env<AttrContext> localEnv =
             env.dup(tree, env.info.dup(new Scope.ClassScope(tree.sym, scopeCounter)));
         localEnv.enclClass = tree;
         localEnv.outer = env;
         localEnv.info.isSelfCall = false;
         localEnv.info.lint = null; // leave this to be filled in by Attr,
                                    // when annotations have been processed
         return localEnv;
     }
     /** Create a fresh environment for toplevels.
      *  @param tree     The toplevel tree.
      */
     Env<AttrContext> topLevelEnv(JCCompilationUnit tree) {
         Env<AttrContext> localEnv = new Env<AttrContext>(tree, new AttrContext());
         localEnv.toplevel = tree;
         localEnv.enclClass = predefClassDef;
         tree.namedImportScope = new Scope.ImportScope(tree.packge);
         tree.starImportScope = new Scope.ImportScope(tree.packge);
         localEnv.info.scope = tree.namedImportScope;
         localEnv.info.lint = lint;
         return localEnv;
     }
     public Env<AttrContext> getTopLevelEnv(JCCompilationUnit tree) {
         Env<AttrContext> localEnv = new Env<AttrContext>(tree, new AttrContext());
         localEnv.toplevel = tree;
         localEnv.enclClass = predefClassDef;
         localEnv.info.scope = tree.namedImportScope;
         localEnv.info.lint = lint;
         return localEnv;
     }
     /** The scope in which a member definition in environment env is to be entered
      *  This is usually the environment's scope, except for class environments,
      *  where the local scope is for type variables, and the this and super symbol
      *  only, and members go into the class member scope.
      */
     Scope enterScope(Env<AttrContext> env) {
         return (env.tree.getTag() == JCTree.CLASSDEF)
             ? ((JCClassDecl) env.tree).sym.members_field
             : env.info.scope;
     }
 /* ************************************************************************
  * Visitor methods for phase 1: class enter
  *************************************************************************/
     /** Visitor argument: the current environment.
      */
     protected Env<AttrContext> env;
     /** Visitor result: the computed type.
      */
     Type result;
     /** Visitor method: enter all classes in given tree, catching any
      *  completion failure exceptions. Return the tree's type.
      *
      *  @param tree    The tree to be visited.
      *  @param env     The environment visitor argument.
      */
     Type classEnter(JCTree tree, Env<AttrContext> env) {
         Env<AttrContext> prevEnv = this.env;
         try {
             this.env = env;
             tree.accept(this);
             return result;
         }  catch (CompletionFailure ex) {
             return chk.completionError(tree.pos(), ex);
         } finally {
             this.env = prevEnv;
         }
     }
     /** Visitor method: enter classes of a list of trees, returning a list of types.
      */
     <T extends JCTree> List<Type> classEnter(List<T> trees, Env<AttrContext> env) {
         ListBuffer<Type> ts = new ListBuffer<Type>();
         for (List<T> l = trees; l.nonEmpty(); l = l.tail) {
             Type t = classEnter(l.head, env);
             if (t != null)
                 ts.append(t);
         }
         return ts.toList();
     }
     @Override
     public void visitTopLevel(JCCompilationUnit tree) {
         JavaFileObject prev = log.useSource(tree.sourcefile);
         boolean addEnv = false;
         boolean isPkgInfo = tree.sourcefile.isNameCompatible("package-info",
                                                              JavaFileObject.Kind.SOURCE);
         if (tree.pid != null) {
             tree.packge = reader.enterPackage(TreeInfo.fullName(tree.pid));
             if (tree.packageAnnotations.nonEmpty() || pkginfoOpt == PkgInfo.ALWAYS) {
                 if (isPkgInfo) {
                     addEnv = true;
                 } else {
                     log.error(tree.packageAnnotations.head.pos(),
                               "pkg.annotations.sb.in.package-info.java");
                 }
             }
         } else {
             tree.packge = syms.unnamedPackage;
         }
         tree.packge.complete(); // Find all classes in package.
         Env<AttrContext> topEnv = topLevelEnv(tree);
         // Save environment of package-info.java file.
         if (isPkgInfo) {
             Env<AttrContext> env0 = typeEnvs.get(tree.packge);
             if (env0 == null) {
                 typeEnvs.put(tree.packge, topEnv);
             } else {
                 JCCompilationUnit tree0 = env0.toplevel;
                 if (!fileManager.isSameFile(tree.sourcefile, tree0.sourcefile)) {
                     log.warning(tree.pid != null ? tree.pid.pos()
                                                  : null,
                                 "pkg-info.already.seen",
                                 tree.packge);
                     if (addEnv || (tree0.packageAnnotations.isEmpty() &&
                                    tree.docComments != null &&
                                    tree.docComments.get(tree) != null)) {
                         typeEnvs.put(tree.packge, topEnv);
                     }
                 }
             }
             for (Symbol q = tree.packge; q != null && q.kind == PCK; q = q.owner)
                 q.flags_field |= EXISTS;
             Name name = names.package_info;
             ClassSymbol c = reader.enterClass(name, tree.packge);
             c.flatname = names.fromString(tree.packge + "." + name);
             c.sourcefile = tree.sourcefile;
             c.completer = null;
             c.members_field = new Scope.ClassScope(c, scopeCounter);
             tree.packge.package_info = c;
         }
         classEnter(tree.defs, topEnv);
         if (addEnv) {
             todo.append(topEnv);
         }
         log.useSource(prev);
         result = null;
     }
     @Override
     public void visitClassDef(JCClassDecl tree) {
         Symbol owner = env.info.scope.owner;
         Scope enclScope = enterScope(env);
         ClassSymbol c;
         if (owner.kind == PCK) {
             // We are seeing a toplevel class.
             PackageSymbol packge = (PackageSymbol)owner;
             for (Symbol q = packge; q != null && q.kind == PCK; q = q.owner)
                 q.flags_field |= EXISTS;
             c = reader.enterClass(tree.name, packge);
             packge.members().enterIfAbsent(c);
             if ((tree.mods.flags & PUBLIC) != 0 && !classNameMatchesFileName(c, env)) {
                 log.error(tree.pos(),
                           "class.public.should.be.in.file", tree.name);
             }
         } else {
             if (!tree.name.isEmpty() &&
                 !chk.checkUniqueClassName(tree.pos(), tree.name, enclScope)) {
                 result = null;
                 return;
             }
             if (owner.kind == TYP) {
                 // We are seeing a member class.
                 c = reader.enterClass(tree.name, (TypeSymbol)owner);
                 if ((owner.flags_field & INTERFACE) != 0) {
                     tree.mods.flags |= PUBLIC | STATIC;
                 }
             } else {
                 // We are seeing a local class.
                 c = reader.defineClass(tree.name, owner);
                 c.flatname = chk.localClassName(c);
                 if (!c.name.isEmpty())
                     chk.checkTransparentClass(tree.pos(), c, env.info.scope);
             }
         }
         tree.sym = c;
         // Enter class into `compiled' table and enclosing scope.
         if (chk.compiled.get(c.flatname) != null) {
             duplicateClass(tree.pos(), c);
             result = types.createErrorType(tree.name, (TypeSymbol)owner, Type.noType);
             tree.sym = (ClassSymbol)result.tsym;
             return;
         }
         chk.compiled.put(c.flatname, c);
         enclScope.enter(c);
         // Set up an environment for class block and store in `typeEnvs'
         // table, to be retrieved later in memberEnter and attribution.
         Env<AttrContext> localEnv = classEnv(tree, env);
         typeEnvs.put(c, localEnv);
         // Fill out class fields.
         c.completer = memberEnter;
         c.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, c, tree);
         c.sourcefile = env.toplevel.sourcefile;
         c.members_field = new Scope.ClassScope(c, scopeCounter);
         ClassType ct = (ClassType)c.type;
         if (owner.kind != PCK && (c.flags_field & STATIC) == 0) {
             // We are seeing a local or inner class.
             // Set outer_field of this class to closest enclosing class
             // which contains this class in a non-static context
             // (its "enclosing instance class"), provided such a class exists.
             Symbol owner1 = owner;
             while ((owner1.kind & (VAR | MTH)) != 0 &&
                    (owner1.flags_field & STATIC) == 0) {
                 owner1 = owner1.owner;
             }
             if (owner1.kind == TYP) {
                 ct.setEnclosingType(owner1.type);
             }
         }
         // Enter type parameters.
         ct.typarams_field = classEnter(tree.typarams, localEnv);
         // Add non-local class to uncompleted, to make sure it will be
         // completed later.
         if (!c.isLocal() && uncompleted != null) uncompleted.append(c);
 //      System.err.println("entering " + c.fullname + " in " + c.owner);//DEBUG
         // Recursively enter all member classes.
         classEnter(tree.defs, localEnv);
         result = c.type;
     }
     //where
         /** Does class have the same name as the file it appears in?
          */
         private static boolean classNameMatchesFileName(ClassSymbol c,
                                                         Env<AttrContext> env) {
             return env.toplevel.sourcefile.isNameCompatible(c.name.toString(),
                                                             JavaFileObject.Kind.SOURCE);
         }
     /** Complain about a duplicate class. */
     protected void duplicateClass(DiagnosticPosition pos, ClassSymbol c) {
         log.error(pos, "duplicate.class", c.fullname);
     }
     /** Class enter visitor method for type parameters.
      *  Enter a symbol for type parameter in local scope, after checking that it
      *  is unique.
      */
     @Override
     public void visitTypeParameter(JCTypeParameter tree) {
         TypeVar a = (tree.type != null)
             ? (TypeVar)tree.type
             : new TypeVar(tree.name, env.info.scope.owner, syms.botType);
         tree.type = a;
         if (chk.checkUnique(tree.pos(), a.tsym, env.info.scope)) {
             env.info.scope.enter(a.tsym);
         }
         result = a;
     }
     /** Default class enter visitor method: do nothing.
      */
     @Override
     public void visitTree(JCTree tree) {
         result = null;
     }
     /** Main method: enter all classes in a list of toplevel trees.
      *  @param trees      The list of trees to be processed.
      */
     public void main(List<JCCompilationUnit> trees) {
         complete(trees, null);
     }
     /** Main method: enter one class from a list of toplevel trees and
      *  place the rest on uncompleted for later processing.
      *  @param trees      The list of trees to be processed.
      *  @param c          The class symbol to be processed.
      */
     public void complete(List<JCCompilationUnit> trees, ClassSymbol c) {
         annotate.enterStart();
         ListBuffer<ClassSymbol> prevUncompleted = uncompleted;
         if (memberEnter.completionEnabled) uncompleted = new ListBuffer<ClassSymbol>();
         try {
             // enter all classes, and construct uncompleted list
             classEnter(trees, null);
             // complete all uncompleted classes in memberEnter
             if  (memberEnter.completionEnabled) {
                 while (uncompleted.nonEmpty()) {
                     ClassSymbol clazz = uncompleted.next();
                     if (c == null || c == clazz || prevUncompleted == null)
                         clazz.complete();
                     else
                         // defer
                         prevUncompleted.append(clazz);
                 }
                 // if there remain any unimported toplevels (these must have
                 // no classes at all), process their import statements as well.
                 for (JCCompilationUnit tree : trees) {
                     if (tree.starImportScope.elems == null) {
                         JavaFileObject prev = log.useSource(tree.sourcefile);
                         Env<AttrContext> topEnv = topLevelEnv(tree);
                         memberEnter.memberEnter(tree, topEnv);
                         log.useSource(prev);
                     }
                 }
             }
         } finally {
             uncompleted = prevUncompleted;
             annotate.enterDone();
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/comp/Enter.java@7755f47542a0 (annotated)

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