Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 2005, 2010, 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.EnumSet;

 import java.util.HashMap;

 import java.util.Map;

 import com.sun.tools.javac.code.Symbol.*;

 import com.sun.tools.javac.util.Context;

 import com.sun.tools.javac.util.List;

 import com.sun.tools.javac.util.Options;

 import com.sun.tools.javac.util.Pair;

 import static com.sun.tools.javac.code.Flags.*;

 /**

  * A class for handling -Xlint suboptions and @SuppresssWarnings.

  *

  *  <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 Lint

 {

     /** The context key for the root Lint object. */

     protected static final Context.Key<Lint> lintKey = new Context.Key<Lint>();

     /** Get the root Lint instance. */

     public static Lint instance(Context context) {

         Lint instance = context.get(lintKey);

         if (instance == null)

             instance = new Lint(context);

         return instance;

     }

     /**

      * Returns the result of combining the values in this object with

      * the given annotation.

      */

     public Lint augment(Attribute.Compound attr) {

         return augmentor.augment(this, attr);

     }

     /**

      * Returns the result of combining the values in this object with

      * the given annotations.

      */

     public Lint augment(List<Attribute.Compound> attrs) {

         return augmentor.augment(this, attrs);

     }

     /**

      * Returns the result of combining the values in this object with

      * the given annotations and flags.

      */

     public Lint augment(List<Attribute.Compound> attrs, long flags) {

         Lint l = augmentor.augment(this, attrs);

         if ((flags & DEPRECATED) != 0) {

             if (l == this)

                 l = new Lint(this);

             l.values.remove(LintCategory.DEPRECATION);

             l.suppressedValues.add(LintCategory.DEPRECATION);

         }

         return l;

     }

     private final AugmentVisitor augmentor;

     private final EnumSet<LintCategory> values;

     private final EnumSet<LintCategory> suppressedValues;

     private static Map<String, LintCategory> map = new HashMap<String,LintCategory>();

     protected Lint(Context context) {

         // initialize values according to the lint options

         Options options = Options.instance(context);

         values = EnumSet.noneOf(LintCategory.class);

         for (Map.Entry<String, LintCategory> e: map.entrySet()) {

             if (options.lint(e.getKey()))

                 values.add(e.getValue());

         }

         suppressedValues = EnumSet.noneOf(LintCategory.class);

         context.put(lintKey, this);

         augmentor = new AugmentVisitor(context);

     }

     protected Lint(Lint other) {

         this.augmentor = other.augmentor;

         this.values = other.values.clone();

         this.suppressedValues = other.suppressedValues.clone();

     }

     @Override

     public String toString() {

         return "Lint:[values" + values + " suppressedValues" + suppressedValues + "]";

     }

     /**

      * Categories of warnings that can be generated by the compiler.

      */

     public enum LintCategory {

         /**

          * Warn about use of unnecessary casts.

          */

         CAST("cast"),

         /**

          * Warn about issues related to classfile contents

          */

         CLASSFILE("classfile"),

         /**

          * Warn about use of deprecated items.

          */

         DEPRECATION("deprecation"),

         /**

          * Warn about items which are documented with an {@code @deprecated} JavaDoc

          * comment, but which do not have {@code @Deprecated} annotation.

          */

         DEP_ANN("dep-ann"),

         /**

          * Warn about division by constant integer 0.

          */

         DIVZERO("divzero"),

         /**

          * Warn about empty statement after if.

          */

         EMPTY("empty"),

         /**

          * Warn about falling through from one case of a switch statement to the next.

          */

         FALLTHROUGH("fallthrough"),

         /**

          * Warn about finally clauses that do not terminate normally.

          */

         FINALLY("finally"),

         /**

          * Warn about issues relating to use of command line options

          */

         OPTIONS("options"),

         /**

          * Warn about issues regarding method overrides.

          */

         OVERRIDES("overrides"),

         /**

          * Warn about invalid path elements on the command line.

          * Such warnings cannot be suppressed with the SuppressWarnings

          * annotation.

          */

         PATH("path"),

         /**

          * Warn about issues regarding annotation processing.

          */

         PROCESSING("processing"),

         /**

          * Warn about unchecked operations on raw types.

          */

         RAW("rawtypes"),

         /**

          * Warn about Serializable classes that do not provide a serial version ID.

          */

         SERIAL("serial"),

         /**

          * Warn about issues relating to use of statics

          */

         STATIC("static"),

         /**

          * Warn about proprietary API that may be removed in a future release.

          */

         SUNAPI("sunapi", true),

         /**

          * Warn about issues relating to use of try blocks (i.e. try-with-resources)

          */

         TRY("try"),

         /**

          * Warn about unchecked operations on raw types.

          */

         UNCHECKED("unchecked"),

         /**

          * Warn about potentially unsafe vararg methods

          */

         VARARGS("varargs");

         LintCategory(String option) {

             this(option, false);

         }

         LintCategory(String option, boolean hidden) {

             this.option = option;

             this.hidden = hidden;

             map.put(option, this);

         }

         static LintCategory get(String option) {

             return map.get(option);

         }

         public final String option;

         public final boolean hidden;

     };

     /**

      * Checks if a warning category is enabled. A warning category may be enabled

      * on the command line, or by default, and can be temporarily disabled with

      * the SuppressWarnings annotation.

      */

     public boolean isEnabled(LintCategory lc) {

         return values.contains(lc);

     }

     /**

      * Checks is a warning category has been specifically suppressed, by means

      * of the SuppressWarnings annotation, or, in the case of the deprecated

      * category, whether it has been implicitly suppressed by virtue of the

      * current entity being itself deprecated.

      */

     public boolean isSuppressed(LintCategory lc) {

         return suppressedValues.contains(lc);

     }

     protected static class AugmentVisitor implements Attribute.Visitor {

         private final Context context;

         private Symtab syms;

         private Lint parent;

         private Lint lint;

         AugmentVisitor(Context context) {

             // to break an ugly sequence of initialization dependencies,

             // we defer the initialization of syms until it is needed

             this.context = context;

         }

         Lint augment(Lint parent, Attribute.Compound attr) {

             initSyms();

             this.parent = parent;

             lint = null;

             attr.accept(this);

             return (lint == null ? parent : lint);

         }

         Lint augment(Lint parent, List<Attribute.Compound> attrs) {

             initSyms();

             this.parent = parent;

             lint = null;

             for (Attribute.Compound a: attrs) {

                 a.accept(this);

             }

             return (lint == null ? parent : lint);

         }

         private void initSyms() {

             if (syms == null)

                 syms = Symtab.instance(context);

         }

         private void suppress(LintCategory lc) {

             if (lint == null)

                 lint = new Lint(parent);

             lint.suppressedValues.add(lc);

             lint.values.remove(lc);

         }

         public void visitConstant(Attribute.Constant value) {

             if (value.type.tsym == syms.stringType.tsym) {

                 LintCategory lc = LintCategory.get((String) (value.value));

                 if (lc != null)

                     suppress(lc);

             }

         }

         public void visitClass(Attribute.Class clazz) {

         }

         // If we find a @SuppressWarnings annotation, then we continue

         // walking the tree, in order to suppress the individual warnings

         // specified in the @SuppressWarnings annotation.

         public void visitCompound(Attribute.Compound compound) {

             if (compound.type.tsym == syms.suppressWarningsType.tsym) {

                 for (List<Pair<MethodSymbol,Attribute>> v = compound.values;

                      v.nonEmpty(); v = v.tail) {

                     Pair<MethodSymbol,Attribute> value = v.head;

                     if (value.fst.name.toString().equals("value"))

                         value.snd.accept(this);

                 }

             }

         }

         public void visitArray(Attribute.Array array) {

             for (Attribute value : array.values)

                 value.accept(this);

         }

         public void visitEnum(Attribute.Enum e) {

         }

         public void visitError(Attribute.Error e) {

         }

     };

 }