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

 /*

  * Copyright (c) 2009, 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.javap;

 import com.sun.tools.classfile.Attribute;

 import com.sun.tools.classfile.Code_attribute;

 import com.sun.tools.classfile.ConstantPool;

 import com.sun.tools.classfile.ConstantPoolException;

 import com.sun.tools.classfile.Descriptor;

 import com.sun.tools.classfile.Descriptor.InvalidDescriptor;

 import com.sun.tools.classfile.Instruction;

 import com.sun.tools.classfile.LocalVariableTable_attribute;

 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 local variables.

  *

  *  <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 LocalVariableTableWriter extends  InstructionDetailWriter {

     public enum NoteKind {

         START("start") {

             public boolean match(LocalVariableTable_attribute.Entry entry, int pc) {

                 return (pc == entry.start_pc);

             }

         },

         END("end") {

             public boolean match(LocalVariableTable_attribute.Entry entry, int pc) {

                 return (pc == entry.start_pc + entry.length);

             }

         };

         NoteKind(String text) {

             this.text = text;

         }

         public abstract boolean match(LocalVariableTable_attribute.Entry entry, int pc);

         public final String text;

     };

     static LocalVariableTableWriter instance(Context context) {

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

         if (instance == null)

             instance = new LocalVariableTableWriter(context);

         return instance;

     }

     protected LocalVariableTableWriter(Context context) {

         super(context);

         context.put(LocalVariableTableWriter.class, this);

         classWriter = ClassWriter.instance(context);

     }

     public void reset(Code_attribute attr) {

         codeAttr = attr;

         pcMap = new HashMap<Integer, List<LocalVariableTable_attribute.Entry>>();

         LocalVariableTable_attribute lvt =

                 (LocalVariableTable_attribute) (attr.attributes.get(Attribute.LocalVariableTable));

         if (lvt == null)

             return;

         for (int i = 0; i < lvt.local_variable_table.length; i++) {

             LocalVariableTable_attribute.Entry entry = lvt.local_variable_table[i];

             put(entry.start_pc, entry);

             put(entry.start_pc + entry.length, entry);

         }

     }

     public void writeDetails(Instruction instr) {

         int pc = instr.getPC();

         writeLocalVariables(pc, NoteKind.END);

         writeLocalVariables(pc, NoteKind.START);

     }

     @Override

     public void flush() {

         int pc = codeAttr.code_length;

         writeLocalVariables(pc, NoteKind.END);

     }

     public void writeLocalVariables(int pc, NoteKind kind) {

         ConstantPool constant_pool = classWriter.getClassFile().constant_pool;

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

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

         if (entries != null) {

             for (ListIterator<LocalVariableTable_attribute.Entry> iter =

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

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

                 LocalVariableTable_attribute.Entry entry =

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

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

                     print(indent);

                     print(kind.text);

                     print(" local ");

                     print(entry.index);

                     print(" // ");

                     Descriptor d = new Descriptor(entry.descriptor_index);

                     try {

                         print(d.getFieldType(constant_pool));

                     } catch (InvalidDescriptor e) {

                         print(report(e));

                     } catch (ConstantPoolException e) {

                         print(report(e));

                     }

                     print(" ");

                     try {

                         print(constant_pool.getUTF8Value(entry.name_index));

                     } catch (ConstantPoolException e) {

                         print(report(e));

                     }

                     println();

                 }

             }

         }

     }

     private void put(int pc, LocalVariableTable_attribute.Entry entry) {

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

         if (list == null) {

             list = new ArrayList<LocalVariableTable_attribute.Entry>();

             pcMap.put(pc, list);

         }

         if (!list.contains(entry))

             list.add(entry);

     }

     private ClassWriter classWriter;

     private Code_attribute codeAttr;

     private Map<Integer, List<LocalVariableTable_attribute.Entry>> pcMap;

 }