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

 /*

  * Copyright 2009 Sun Microsystems, Inc.  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.  Sun designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  */

 package com.sun.tools.javap;

 import com.sun.tools.classfile.Code_attribute;

 import com.sun.tools.classfile.Code_attribute.Exception_data;

 import com.sun.tools.classfile.Instruction;

 import java.util.ArrayList;

 import java.util.HashMap;

 import java.util.List;

 import java.util.ListIterator;

 import java.util.Map;

 /**

  * Annotate instructions with details about try blocks.

  *

  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  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 TryBlockWriter extends InstructionDetailWriter {

     public enum NoteKind {

         START("try") {

             public boolean match(Exception_data entry, int pc) {

                 return (pc == entry.start_pc);

             }

         },

         END("end try") {

             public boolean match(Exception_data entry, int pc) {

                 return (pc == entry.end_pc);

             }

         },

         HANDLER("catch") {

             public boolean match(Exception_data entry, int pc) {

                 return (pc == entry.handler_pc);

             }

         };

         NoteKind(String text) {

             this.text = text;

         }

         public abstract boolean match(Exception_data entry, int pc);

         public final String text;

     };

     static TryBlockWriter instance(Context context) {

         TryBlockWriter instance = context.get(TryBlockWriter.class);

         if (instance == null)

             instance = new TryBlockWriter(context);

         return instance;

     }

     protected TryBlockWriter(Context context) {

         super(context);

         context.put(TryBlockWriter.class, this);

         constantWriter = ConstantWriter.instance(context);

     }

     public void reset(Code_attribute attr) {

         indexMap = new HashMap<Exception_data, Integer>();

         pcMap = new HashMap<Integer, List<Exception_data>>();

         for (int i = 0; i < attr.exception_table.length; i++) {

             Exception_data entry = attr.exception_table[i];

             indexMap.put(entry, i);

             put(entry.start_pc, entry);

             put(entry.end_pc, entry);

             put(entry.handler_pc, entry);

         }

     }

     public void writeDetails(Instruction instr) {

         writeTrys(instr, NoteKind.END);

         writeTrys(instr, NoteKind.START);

         writeTrys(instr, NoteKind.HANDLER);

     }

     public void writeTrys(Instruction instr, NoteKind kind) {

         String indent = space(2); // get from Options?

         int pc = instr.getPC();

         List<Exception_data> entries = pcMap.get(pc);

         if (entries != null) {

             for (ListIterator<Exception_data> iter =

                     entries.listIterator(kind == NoteKind.END ? entries.size() : 0);

                     kind == NoteKind.END ? iter.hasPrevious() : iter.hasNext() ; ) {

                 Exception_data entry =

                         kind == NoteKind.END ? iter.previous() : iter.next();

                 if (kind.match(entry, pc)) {

                     print(indent);

                     print(kind.text);

                     print("[");

                     print(indexMap.get(entry));

                     print("] ");

                     if (entry.catch_type == 0)

                         print("finally");

                     else {

                         print("#" + entry.catch_type);

                         print(" // ");

                         constantWriter.write(entry.catch_type);

                     }

                     println();

                 }

             }

         }

     }

     private void put(int pc, Exception_data entry) {

         List<Exception_data> list = pcMap.get(pc);

         if (list == null) {

             list = new ArrayList<Exception_data>();

             pcMap.put(pc, list);

         }

         if (!list.contains(entry))

             list.add(entry);

     }

     private Map<Integer, List<Exception_data>> pcMap;

     private Map<Exception_data, Integer> indexMap;

     private ConstantWriter constantWriter;

 }