content: /*
   * 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 openjdk.tools.javap;
  
  import openjdk.tools.classfile.Attribute;
  import openjdk.tools.classfile.Code_attribute;
  import openjdk.tools.classfile.ConstantPool;
  import openjdk.tools.classfile.ConstantPoolException;
  import openjdk.tools.classfile.Descriptor;
  import openjdk.tools.classfile.Descriptor.InvalidDescriptor;
  import openjdk.tools.classfile.Instruction;
  import openjdk.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<>();
          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<>();
              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;
  }
  