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.Code_attribute;
  import openjdk.tools.classfile.Code_attribute.Exception_data;
  import openjdk.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 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 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<>();
          pcMap = new HashMap<>();
          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<>();
              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;
  }
  