jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/code/Annotations.java@71f35e4b93a5 (annotated)

src/share/classes/com/sun/tools/javac/code/Annotations.java@71f35e4b93a5 (annotated)

src/share/classes/com/sun/tools/javac/code/Annotations.java

Wed, 23 Jan 2013 13:27:24 -0800

author: jjg
date: Wed, 23 Jan 2013 13:27:24 -0800
changeset 1521: 71f35e4b93a5
parent 1492: df694c775e8a
child 1755: ddb4a2bfcd82
permissions: -rw-r--r--

8006775: JSR 308: Compiler changes in JDK8
Reviewed-by: jjg
Contributed-by: mernst@cs.washington.edu, wmdietl@cs.washington.edu, mpapi@csail.mit.edu, mahmood@notnoop.com

 /*
  * Copyright (c) 2012, 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.code;
 import java.util.Map;
 import javax.tools.JavaFileObject;
 import com.sun.tools.javac.comp.Annotate;
 import com.sun.tools.javac.comp.AttrContext;
 import com.sun.tools.javac.comp.Env;
 import com.sun.tools.javac.util.*;
 import com.sun.tools.javac.util.Assert;
 import com.sun.tools.javac.util.List;
 import com.sun.tools.javac.util.Log;
 import com.sun.tools.javac.util.Pair;
 import static com.sun.tools.javac.code.Kinds.PCK;
 /**
  * Container for all annotations (attributes in javac) on a Symbol.
  *
  * This class is explicitly mutable. Its contents will change when attributes
  * are annotated onto the Symbol. However this class depends on the facts that
  * List (in javac) is immutable.
  *
  * An instance of this class can be in one of three states:
  *
  * NOT_STARTED indicates that the Symbol this instance belongs to has not been
  * annotated (yet). Specifically if the declaration is not annotated this
  * instance will never move past NOT_STARTED. You can never go back to
  * NOT_STARTED.
  *
  * IN_PROGRESS annotations have been found on the declaration. Will be processed
  * later. You can reset to IN_PROGRESS. While IN_PROGRESS you can set the list
  * of attributes (and this moves out of the IN_PROGRESS state).
  *
  * "unnamed" this Annotations contains some attributes, possibly the final set.
  * While in this state you can only prepend or append to the attributes not set
  * it directly. You can also move back to the IN_PROGRESS state using reset().
  *
  * <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 Annotations {
     private static final List<Attribute.Compound> DECL_NOT_STARTED = List.of(null);
     private static final List<Attribute.Compound> DECL_IN_PROGRESS = List.of(null);
     /*
      * This field should never be null
      */
     private List<Attribute.Compound> attributes = DECL_NOT_STARTED;
     /*
      * This field should never be null
      */
     private List<Attribute.TypeCompound> type_attributes = List.<Attribute.TypeCompound>nil();
     /*
      * The Symbol this Annotations instance belongs to
      */
     private final Symbol sym;
     public Annotations(Symbol sym) {
         this.sym = sym;
     }
     public List<Attribute.Compound> getDeclarationAttributes() {
         return filterDeclSentinels(attributes);
     }
     public List<Attribute.TypeCompound> getTypeAttributes() {
         return type_attributes;
     }
     public void setDeclarationAttributes(List<Attribute.Compound> a) {
         Assert.check(pendingCompletion() || !isStarted());
         if (a == null) {
             throw new NullPointerException();
         }
         attributes = a;
     }
     public void setTypeAttributes(List<Attribute.TypeCompound> a) {
         if (a == null) {
             throw new NullPointerException();
         }
         type_attributes = a;
     }
     public void setAttributes(Annotations other) {
         if (other == null) {
             throw new NullPointerException();
         }
         setDeclarationAttributes(other.getDeclarationAttributes());
         setTypeAttributes(other.getTypeAttributes());
     }
     public void setDeclarationAttributesWithCompletion(final Annotate.AnnotateRepeatedContext<Attribute.Compound> ctx) {
         Assert.check(pendingCompletion() || (!isStarted() && sym.kind == PCK));
         this.setDeclarationAttributes(getAttributesForCompletion(ctx));
     }
     public void appendTypeAttributesWithCompletion(final Annotate.AnnotateRepeatedContext<Attribute.TypeCompound> ctx) {
         this.appendUniqueTypes(getAttributesForCompletion(ctx));
     }
     private <T extends Attribute.Compound> List<T> getAttributesForCompletion(
             final Annotate.AnnotateRepeatedContext<T> ctx) {
         Map<Symbol.TypeSymbol, ListBuffer<T>> annotated = ctx.annotated;
         boolean atLeastOneRepeated = false;
         List<T> buf = List.<T>nil();
         for (ListBuffer<T> lb : annotated.values()) {
             if (lb.size() == 1) {
                 buf = buf.prepend(lb.first());
             } else { // repeated
                 // This will break when other subtypes of Attributs.Compound
                 // are introduced, because PlaceHolder is a subtype of TypeCompound.
                 T res;
                 @SuppressWarnings("unchecked")
                 T ph = (T) new Placeholder<T>(ctx, lb.toList(), sym);
                 res = ph;
                 buf = buf.prepend(res);
                 atLeastOneRepeated = true;
             }
         }
         if (atLeastOneRepeated) {
             // The Symbol s is now annotated with a combination of
             // finished non-repeating annotations and placeholders for
             // repeating annotations.
             //
             // We need to do this in two passes because when creating
             // a container for a repeating annotation we must
             // guarantee that the @Repeatable on the
             // contained annotation is fully annotated
             //
             // The way we force this order is to do all repeating
             // annotations in a pass after all non-repeating are
             // finished. This will work because @Repeatable
             // is non-repeating and therefore will be annotated in the
             // fist pass.
             // Queue a pass that will replace Attribute.Placeholders
             // with Attribute.Compound (made from synthesized containers).
             ctx.annotateRepeated(new Annotate.Annotator() {
                 @Override
                 public String toString() {
                     return "repeated annotation pass of: " + sym + " in: " + sym.owner;
                 }
                 @Override
                 public void enterAnnotation() {
                     complete(ctx);
                 }
             });
         }
         // Add non-repeating attributes
         return buf.reverse();
     }
     public Annotations reset() {
         attributes = DECL_IN_PROGRESS;
         return this;
     }
     public boolean isEmpty() {
         return !isStarted()
                 || pendingCompletion()
                 || attributes.isEmpty();
     }
     public boolean isTypesEmpty() {
         return type_attributes.isEmpty();
     }
     public boolean pendingCompletion() {
         return attributes == DECL_IN_PROGRESS;
     }
     public Annotations append(List<Attribute.Compound> l) {
         attributes = filterDeclSentinels(attributes);
         if (l.isEmpty()) {
             ; // no-op
         } else if (attributes.isEmpty()) {
             attributes = l;
         } else {
             attributes = attributes.appendList(l);
         }
         return this;
     }
     public Annotations appendUniqueTypes(List<Attribute.TypeCompound> l) {
         if (l.isEmpty()) {
             ; // no-op
         } else if (type_attributes.isEmpty()) {
             type_attributes = l;
         } else {
             // TODO: in case we expect a large number of annotations, this
             // might be inefficient.
             for (Attribute.TypeCompound tc : l) {
                 if (!type_attributes.contains(tc))
                     type_attributes = type_attributes.append(tc);
             }
         }
         return this;
     }
     public Annotations prepend(List<Attribute.Compound> l) {
         attributes = filterDeclSentinels(attributes);
         if (l.isEmpty()) {
             ; // no-op
         } else if (attributes.isEmpty()) {
             attributes = l;
         } else {
             attributes = attributes.prependList(l);
         }
         return this;
     }
     private List<Attribute.Compound> filterDeclSentinels(List<Attribute.Compound> a) {
         return (a == DECL_IN_PROGRESS || a == DECL_NOT_STARTED)
                 ? List.<Attribute.Compound>nil()
                 : a;
     }
     private boolean isStarted() {
         return attributes != DECL_NOT_STARTED;
     }
     private List<Attribute.Compound> getPlaceholders() {
         List<Attribute.Compound> res = List.<Attribute.Compound>nil();
         for (Attribute.Compound a : filterDeclSentinels(attributes)) {
             if (a instanceof Placeholder) {
                 res = res.prepend(a);
             }
         }
         return res.reverse();
     }
     private List<Attribute.TypeCompound> getTypePlaceholders() {
         List<Attribute.TypeCompound> res = List.<Attribute.TypeCompound>nil();
         for (Attribute.TypeCompound a : type_attributes) {
             if (a instanceof Placeholder) {
                 res = res.prepend(a);
             }
         }
         return res.reverse();
     }
     /*
      * Replace Placeholders for repeating annotations with their containers
      */
     private <T extends Attribute.Compound> void complete(Annotate.AnnotateRepeatedContext<T> ctx) {
         Log log = ctx.log;
         Env<AttrContext> env = ctx.env;
         JavaFileObject oldSource = log.useSource(env.toplevel.sourcefile);
         try {
             // TODO: can we reduce duplication in the following branches?
             if (ctx.isTypeCompound) {
                 Assert.check(!isTypesEmpty());
                 if (isTypesEmpty()) {
                     return;
                 }
                 List<Attribute.TypeCompound> result = List.nil();
                 for (Attribute.TypeCompound a : getTypeAttributes()) {
                     if (a instanceof Placeholder) {
                         @SuppressWarnings("unchecked")
                         Placeholder<Attribute.TypeCompound> ph = (Placeholder<Attribute.TypeCompound>) a;
                         Attribute.TypeCompound replacement = replaceOne(ph, ph.getRepeatedContext());
                         if (null != replacement) {
                             result = result.prepend(replacement);
                         }
                     } else {
                         result = result.prepend(a);
                     }
                 }
                 type_attributes = result.reverse();
                 Assert.check(Annotations.this.getTypePlaceholders().isEmpty());
             } else {
                 Assert.check(!pendingCompletion());
                 if (isEmpty()) {
                     return;
                 }
                 List<Attribute.Compound> result = List.nil();
                 for (Attribute.Compound a : getDeclarationAttributes()) {
                     if (a instanceof Placeholder) {
                         @SuppressWarnings("unchecked")
                         Attribute.Compound replacement = replaceOne((Placeholder<T>) a, ctx);
                         if (null != replacement) {
                             result = result.prepend(replacement);
                         }
                     } else {
                         result = result.prepend(a);
                     }
                 }
                 attributes = result.reverse();
                 Assert.check(Annotations.this.getPlaceholders().isEmpty());
             }
         } finally {
             log.useSource(oldSource);
         }
     }
     private <T extends Attribute.Compound> T replaceOne(Placeholder<T> placeholder, Annotate.AnnotateRepeatedContext<T> ctx) {
         Log log = ctx.log;
         // Process repeated annotations
         T validRepeated = ctx.processRepeatedAnnotations(placeholder.getPlaceholderFor(), sym);
         if (validRepeated != null) {
             // Check that the container isn't manually
             // present along with repeated instances of
             // its contained annotation.
             ListBuffer<T> manualContainer = ctx.annotated.get(validRepeated.type.tsym);
             if (manualContainer != null) {
                 log.error(ctx.pos.get(manualContainer.first()), "invalid.repeatable.annotation.repeated.and.container.present",
                         manualContainer.first().type.tsym);
             }
         }
         // A null return will delete the Placeholder
         return validRepeated;
     }
     private static class Placeholder<T extends Attribute.Compound> extends Attribute.TypeCompound {
         private final Annotate.AnnotateRepeatedContext<T> ctx;
         private final List<T> placeholderFor;
         private final Symbol on;
         public Placeholder(Annotate.AnnotateRepeatedContext<T> ctx, List<T> placeholderFor, Symbol on) {
             super(on.type, List.<Pair<Symbol.MethodSymbol, Attribute>>nil(),
                     ctx.isTypeCompound ?
                             ((Attribute.TypeCompound)placeholderFor.head).position :
                                 null);
             this.ctx = ctx;
             this.placeholderFor = placeholderFor;
             this.on = on;
         }
         @Override
         public String toString() {
             return "<placeholder: " + placeholderFor + " on: " + on + ">";
         }
         public List<T> getPlaceholderFor() {
             return placeholderFor;
         }
         public Annotate.AnnotateRepeatedContext<T> getRepeatedContext() {
             return ctx;
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/code/Annotations.java@71f35e4b93a5 (annotated)

src/share/classes/com/sun/tools/javac/code/Annotations.java