--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/jdk.jdeps/share/classes/com/sun/tools/javap/TryBlockWriter.java	Wed May 27 13:25:18 2015 -0700
@@ -0,0 +1,142 @@
+/*
+ * 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.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 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;
+}