/*

  * Copyright (c) 2002, 2004, 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 org.apidesign.vm4brwsr;

 import java.io.ByteArrayInputStream;

 import java.io.DataInputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.Arrays;

 import org.apidesign.bck2brwsr.core.JavaScriptBody;

 import org.apidesign.bck2brwsr.core.JavaScriptPrototype;

 /** This is a byte code parser heavily based on original code of JavaP utility.

  * As such I decided to keep the original Oracle's GPLv2 header.

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 final class ByteCodeParser {

     private ByteCodeParser() {

     }

     /* Class File Constants */

     public static final int JAVA_MAGIC                   = 0xcafebabe;

     public static final int JAVA_VERSION                 = 45;

     public static final int JAVA_MINOR_VERSION           = 3;

     /* Constant table */

     public static final int CONSTANT_UTF8                = 1;

     public static final int CONSTANT_UNICODE             = 2;

     public static final int CONSTANT_INTEGER             = 3;

     public static final int CONSTANT_FLOAT               = 4;

     public static final int CONSTANT_LONG                = 5;

     public static final int CONSTANT_DOUBLE              = 6;

     public static final int CONSTANT_CLASS               = 7;

     public static final int CONSTANT_STRING              = 8;

     public static final int CONSTANT_FIELD               = 9;

     public static final int CONSTANT_METHOD              = 10;

     public static final int CONSTANT_INTERFACEMETHOD     = 11;

     public static final int CONSTANT_NAMEANDTYPE         = 12;

     public static final int CONSTANT_METHODHANDLE     = 15;

     public static final int CONSTANT_METHODTYPE     = 16;

     public static final int CONSTANT_INVOKEDYNAMIC     = 18;

     /* Access Flags */

     public static final int ACC_PUBLIC                   = 0x00000001;

     public static final int ACC_PRIVATE                  = 0x00000002;

     public static final int ACC_PROTECTED                = 0x00000004;

     public static final int ACC_STATIC                   = 0x00000008;

     public static final int ACC_FINAL                    = 0x00000010;

     public static final int ACC_SYNCHRONIZED             = 0x00000020;

     public static final int ACC_SUPER                        = 0x00000020;

     public static final int ACC_VOLATILE                 = 0x00000040;

     public static final int ACC_TRANSIENT                = 0x00000080;

     public static final int ACC_NATIVE                   = 0x00000100;

     public static final int ACC_INTERFACE                = 0x00000200;

     public static final int ACC_ABSTRACT                 = 0x00000400;

     public static final int ACC_STRICT                   = 0x00000800;

     public static final int ACC_EXPLICIT                 = 0x00001000;

     public static final int ACC_SYNTHETIC                = 0x00010000; // actually, this is an attribute

     /* Type codes for StackMap attribute */

     public static final int ITEM_Bogus      =0; // an unknown or uninitialized value

     public static final int ITEM_Integer    =1; // a 32-bit integer

     public static final int ITEM_Float      =2; // not used

     public static final int ITEM_Double     =3; // not used

     public static final int ITEM_Long       =4; // a 64-bit integer

     public static final int ITEM_Null       =5; // the type of null

     public static final int ITEM_InitObject =6; // "this" in constructor

     public static final int ITEM_Object     =7; // followed by 2-byte index of class name

     public static final int ITEM_NewObject  =8; // followed by 2-byte ref to "new"

     /* Constants used in StackMapTable attribute */

     public static final int SAME_FRAME_BOUND                  = 64;

     public static final int SAME_LOCALS_1_STACK_ITEM_BOUND    = 128;

     public static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247;

     public static final int SAME_FRAME_EXTENDED               = 251;

     public static final int FULL_FRAME                        = 255;

     /* Opcodes */

     public static final int opc_dead                     = -2;

     public static final int opc_label                    = -1;

     public static final int opc_nop                      = 0;

     public static final int opc_aconst_null              = 1;

     public static final int opc_iconst_m1                = 2;

     public static final int opc_iconst_0                 = 3;

     public static final int opc_iconst_1                 = 4;

     public static final int opc_iconst_2                 = 5;

     public static final int opc_iconst_3                 = 6;

     public static final int opc_iconst_4                 = 7;

     public static final int opc_iconst_5                 = 8;

     public static final int opc_lconst_0                 = 9;

     public static final int opc_lconst_1                 = 10;

     public static final int opc_fconst_0                 = 11;

     public static final int opc_fconst_1                 = 12;

     public static final int opc_fconst_2                 = 13;

     public static final int opc_dconst_0                 = 14;

     public static final int opc_dconst_1                 = 15;

     public static final int opc_bipush                   = 16;

     public static final int opc_sipush                   = 17;

     public static final int opc_ldc                      = 18;

     public static final int opc_ldc_w                    = 19;

     public static final int opc_ldc2_w                   = 20;

     public static final int opc_iload                    = 21;

     public static final int opc_lload                    = 22;

     public static final int opc_fload                    = 23;

     public static final int opc_dload                    = 24;

     public static final int opc_aload                    = 25;

     public static final int opc_iload_0                  = 26;

     public static final int opc_iload_1                  = 27;

     public static final int opc_iload_2                  = 28;

     public static final int opc_iload_3                  = 29;

     public static final int opc_lload_0                  = 30;

     public static final int opc_lload_1                  = 31;

     public static final int opc_lload_2                  = 32;

     public static final int opc_lload_3                  = 33;

     public static final int opc_fload_0                  = 34;

     public static final int opc_fload_1                  = 35;

     public static final int opc_fload_2                  = 36;

     public static final int opc_fload_3                  = 37;

     public static final int opc_dload_0                  = 38;

     public static final int opc_dload_1                  = 39;

     public static final int opc_dload_2                  = 40;

     public static final int opc_dload_3                  = 41;

     public static final int opc_aload_0                  = 42;

     public static final int opc_aload_1                  = 43;

     public static final int opc_aload_2                  = 44;

     public static final int opc_aload_3                  = 45;

     public static final int opc_iaload                   = 46;

     public static final int opc_laload                   = 47;

     public static final int opc_faload                   = 48;

     public static final int opc_daload                   = 49;

     public static final int opc_aaload                   = 50;

     public static final int opc_baload                   = 51;

     public static final int opc_caload                   = 52;

     public static final int opc_saload                   = 53;

     public static final int opc_istore                   = 54;

     public static final int opc_lstore                   = 55;

     public static final int opc_fstore                   = 56;

     public static final int opc_dstore                   = 57;

     public static final int opc_astore                   = 58;

     public static final int opc_istore_0                 = 59;

     public static final int opc_istore_1                 = 60;

     public static final int opc_istore_2                 = 61;

     public static final int opc_istore_3                 = 62;

     public static final int opc_lstore_0                 = 63;

     public static final int opc_lstore_1                 = 64;

     public static final int opc_lstore_2                 = 65;

     public static final int opc_lstore_3                 = 66;

     public static final int opc_fstore_0                 = 67;

     public static final int opc_fstore_1                 = 68;

     public static final int opc_fstore_2                 = 69;

     public static final int opc_fstore_3                 = 70;

     public static final int opc_dstore_0                 = 71;

     public static final int opc_dstore_1                 = 72;

     public static final int opc_dstore_2                 = 73;

     public static final int opc_dstore_3                 = 74;

     public static final int opc_astore_0                 = 75;

     public static final int opc_astore_1                 = 76;

     public static final int opc_astore_2                 = 77;

     public static final int opc_astore_3                 = 78;

     public static final int opc_iastore                  = 79;

     public static final int opc_lastore                  = 80;

     public static final int opc_fastore                  = 81;

     public static final int opc_dastore                  = 82;

     public static final int opc_aastore                  = 83;

     public static final int opc_bastore                  = 84;

     public static final int opc_castore                  = 85;

     public static final int opc_sastore                  = 86;

     public static final int opc_pop                      = 87;

     public static final int opc_pop2                     = 88;

     public static final int opc_dup                      = 89;

     public static final int opc_dup_x1                   = 90;

     public static final int opc_dup_x2                   = 91;

     public static final int opc_dup2                     = 92;

     public static final int opc_dup2_x1                  = 93;

     public static final int opc_dup2_x2                  = 94;

     public static final int opc_swap                     = 95;

     public static final int opc_iadd                     = 96;

     public static final int opc_ladd                     = 97;

     public static final int opc_fadd                     = 98;

     public static final int opc_dadd                     = 99;

     public static final int opc_isub                     = 100;

     public static final int opc_lsub                     = 101;

     public static final int opc_fsub                     = 102;

     public static final int opc_dsub                     = 103;

     public static final int opc_imul                     = 104;

     public static final int opc_lmul                     = 105;

     public static final int opc_fmul                     = 106;

     public static final int opc_dmul                     = 107;

     public static final int opc_idiv                     = 108;

     public static final int opc_ldiv                     = 109;

     public static final int opc_fdiv                     = 110;

     public static final int opc_ddiv                     = 111;

     public static final int opc_irem                     = 112;

     public static final int opc_lrem                     = 113;

     public static final int opc_frem                     = 114;

     public static final int opc_drem                     = 115;

     public static final int opc_ineg                     = 116;

     public static final int opc_lneg                     = 117;

     public static final int opc_fneg                     = 118;

     public static final int opc_dneg                     = 119;

     public static final int opc_ishl                     = 120;

     public static final int opc_lshl                     = 121;

     public static final int opc_ishr                     = 122;

     public static final int opc_lshr                     = 123;

     public static final int opc_iushr                    = 124;

     public static final int opc_lushr                    = 125;

     public static final int opc_iand                     = 126;

     public static final int opc_land                     = 127;

     public static final int opc_ior                      = 128;

     public static final int opc_lor                      = 129;

     public static final int opc_ixor                     = 130;

     public static final int opc_lxor                     = 131;

     public static final int opc_iinc                     = 132;

     public static final int opc_i2l                      = 133;

     public static final int opc_i2f                      = 134;

     public static final int opc_i2d                      = 135;

     public static final int opc_l2i                      = 136;

     public static final int opc_l2f                      = 137;

     public static final int opc_l2d                      = 138;

     public static final int opc_f2i                      = 139;

     public static final int opc_f2l                      = 140;

     public static final int opc_f2d                      = 141;

     public static final int opc_d2i                      = 142;

     public static final int opc_d2l                      = 143;

     public static final int opc_d2f                      = 144;

     public static final int opc_i2b                      = 145;

     public static final int opc_int2byte                 = 145;

     public static final int opc_i2c                      = 146;

     public static final int opc_int2char                 = 146;

     public static final int opc_i2s                      = 147;

     public static final int opc_int2short                = 147;

     public static final int opc_lcmp                     = 148;

     public static final int opc_fcmpl                    = 149;

     public static final int opc_fcmpg                    = 150;

     public static final int opc_dcmpl                    = 151;

     public static final int opc_dcmpg                    = 152;

     public static final int opc_ifeq                     = 153;

     public static final int opc_ifne                     = 154;

     public static final int opc_iflt                     = 155;

     public static final int opc_ifge                     = 156;

     public static final int opc_ifgt                     = 157;

     public static final int opc_ifle                     = 158;

     public static final int opc_if_icmpeq                = 159;

     public static final int opc_if_icmpne                = 160;

     public static final int opc_if_icmplt                = 161;

     public static final int opc_if_icmpge                = 162;

     public static final int opc_if_icmpgt                = 163;

     public static final int opc_if_icmple                = 164;

     public static final int opc_if_acmpeq                = 165;

     public static final int opc_if_acmpne                = 166;

     public static final int opc_goto                     = 167;

     public static final int opc_jsr                      = 168;

     public static final int opc_ret                      = 169;

     public static final int opc_tableswitch              = 170;

     public static final int opc_lookupswitch             = 171;

     public static final int opc_ireturn                  = 172;

     public static final int opc_lreturn                  = 173;

     public static final int opc_freturn                  = 174;

     public static final int opc_dreturn                  = 175;

     public static final int opc_areturn                  = 176;

     public static final int opc_return                   = 177;

     public static final int opc_getstatic                = 178;

     public static final int opc_putstatic                = 179;

     public static final int opc_getfield                 = 180;

     public static final int opc_putfield                 = 181;

     public static final int opc_invokevirtual            = 182;

     public static final int opc_invokenonvirtual         = 183;

     public static final int opc_invokespecial            = 183;

     public static final int opc_invokestatic             = 184;

     public static final int opc_invokeinterface          = 185;

     public static final int opc_invokedynamic            = 186;

     public static final int opc_new                      = 187;

     public static final int opc_newarray                 = 188;

     public static final int opc_anewarray                = 189;

     public static final int opc_arraylength              = 190;

     public static final int opc_athrow                   = 191;

     public static final int opc_checkcast                = 192;

     public static final int opc_instanceof               = 193;

     public static final int opc_monitorenter             = 194;

     public static final int opc_monitorexit              = 195;

     public static final int opc_wide                     = 196;

     public static final int opc_multianewarray           = 197;

     public static final int opc_ifnull                   = 198;

     public static final int opc_ifnonnull                = 199;

     public static final int opc_goto_w                   = 200;

     public static final int opc_jsr_w                    = 201;

         /* Pseudo-instructions */

     public static final int opc_bytecode                 = 203;

     public static final int opc_try                      = 204;

     public static final int opc_endtry                   = 205;

     public static final int opc_catch                    = 206;

     public static final int opc_var                      = 207;

     public static final int opc_endvar                   = 208;

     public static final int opc_localsmap                = 209;

     public static final int opc_stackmap                 = 210;

         /* PicoJava prefixes */

     public static final int opc_nonpriv                  = 254;

     public static final int opc_priv                     = 255;

         /* Wide instructions *

     public static final int opc_iload_w         = (opc_wide<<8)|opc_iload;

     public static final int opc_lload_w         = (opc_wide<<8)|opc_lload;

     public static final int opc_fload_w         = (opc_wide<<8)|opc_fload;

     public static final int opc_dload_w         = (opc_wide<<8)|opc_dload;

     public static final int opc_aload_w         = (opc_wide<<8)|opc_aload;

     public static final int opc_istore_w        = (opc_wide<<8)|opc_istore;

     public static final int opc_lstore_w        = (opc_wide<<8)|opc_lstore;

     public static final int opc_fstore_w        = (opc_wide<<8)|opc_fstore;

     public static final int opc_dstore_w        = (opc_wide<<8)|opc_dstore;

     public static final int opc_astore_w        = (opc_wide<<8)|opc_astore;

     public static final int opc_ret_w           = (opc_wide<<8)|opc_ret;

     public static final int opc_iinc_w          = (opc_wide<<8)|opc_iinc;

 */

     static class AnnotationParser {

         private final boolean textual;

         private final boolean iterateArray;

         protected AnnotationParser(boolean textual, boolean iterateArray) {

             this.textual = textual;

             this.iterateArray = iterateArray;

         }

         protected void visitAnnotationStart(String type, boolean top) throws IOException {

         }

         protected void visitAnnotationEnd(String type, boolean top) throws IOException {

         }

         protected void visitValueStart(String attrName, char type) throws IOException {

         }

         protected void visitValueEnd(String attrName, char type) throws IOException {

         }

         protected void visitAttr(

             String annoType, String attr, String attrType, String value) throws IOException {

         }

         protected void visitEnumAttr(

             String annoType, String attr, String attrType, String value) throws IOException {

             visitAttr(annoType, attr, attrType, value);

         }

         /**

          * Initialize the parsing with constant pool from

          * <code>cd</code>.

          *

          * @param attr the attribute defining annotations

          * @param cd constant pool

          * @throws IOException in case I/O fails

          */

         public final void parse(byte[] attr, ClassData cd) throws IOException {

             ByteArrayInputStream is = new ByteArrayInputStream(attr);

             DataInputStream dis = new DataInputStream(is);

             try {

                 read(dis, cd);

             } finally {

                 is.close();

             }

         }

         private void read(DataInputStream dis, ClassData cd) throws IOException {

             int cnt = dis.readUnsignedShort();

             for (int i = 0; i < cnt; i++) {

                 readAnno(dis, cd, true);

             }

         }

         private void readAnno(DataInputStream dis, ClassData cd, boolean top) throws IOException {

             int type = dis.readUnsignedShort();

             String typeName = cd.StringValue(type);

             visitAnnotationStart(typeName, top);

             int cnt = dis.readUnsignedShort();

             for (int i = 0; i < cnt; i++) {

                 String attrName = cd.StringValue(dis.readUnsignedShort());

                 readValue(dis, cd, typeName, attrName);

             }

             visitAnnotationEnd(typeName, top);

             if (cnt == 0) {

                 visitAttr(typeName, null, null, null);

             }

         }

         private void readValue(

             DataInputStream dis, ClassData cd, String typeName, String attrName) throws IOException {

             char type = (char) dis.readByte();

             visitValueStart(attrName, type);

             if (type == '@') {

                 readAnno(dis, cd, false);

             } else if ("CFJZsSIDB".indexOf(type) >= 0) { // NOI18N

                 int primitive = dis.readUnsignedShort();

                 String val = cd.stringValue(primitive, textual);

                 String attrType;

                 if (type == 's') {

                     attrType = "Ljava_lang_String_2";

                     if (textual) {

                         val = '"' + val + '"';

                     }

                 } else {

                     attrType = "" + type;

                 }

                 visitAttr(typeName, attrName, attrType, val);

             } else if (type == 'c') {

                 int cls = dis.readUnsignedShort();

             } else if (type == '[') {

                 int cnt = dis.readUnsignedShort();

                 for (int i = 0; i < cnt; i++) {

                     readValue(dis, cd, typeName, iterateArray ? attrName : null);

                 }

             } else if (type == 'e') {

                 int enumT = dis.readUnsignedShort();

                 String attrType = cd.stringValue(enumT, textual);

                 int enumN = dis.readUnsignedShort();

                 String val = cd.stringValue(enumN, textual);

                 visitEnumAttr(typeName, attrName, attrType, val);

             } else {

                 throw new IOException("Unknown type " + type);

             }

             visitValueEnd(attrName, type);

         }

     }

     /**

      * Reads and stores attribute information.

      *

      * @author Sucheta Dambalkar (Adopted code from jdis)

      */

     private static class AttrData {

         ClassData cls;

         int name_cpx;

         int datalen;

         byte data[];

         public AttrData(ClassData cls) {

             this.cls = cls;

         }

         /**

          * Reads unknown attribute.

          */

         public void read(int name_cpx, DataInputStream in) throws IOException {

             this.name_cpx = name_cpx;

             datalen = in.readInt();

             data = new byte[datalen];

             in.readFully(data);

         }

         /**

          * Reads just the name of known attribute.

          */

         public void read(int name_cpx) {

             this.name_cpx = name_cpx;

         }

         /**

          * Returns attribute name.

          */

         public String getAttrName() {

             return cls.getString(name_cpx);

         }

         /**

          * Returns attribute data.

          */

         public byte[] getData() {

             return data;

         }

     }

     /**

      * Stores constant pool entry information with one field.

      *

      * @author Sucheta Dambalkar (Adopted code from jdis)

      */

     private static class CPX {

         int cpx;

         CPX(int cpx) {

             this.cpx = cpx;

         }

     }

     /**

      * Stores constant pool entry information with two fields.

      *

      * @author Sucheta Dambalkar (Adopted code from jdis)

      */

     private static class CPX2 {

         int cpx1, cpx2;

         CPX2(int cpx1, int cpx2) {

             this.cpx1 = cpx1;

             this.cpx2 = cpx2;

         }

     }

     /**

      * Central data repository of the Java Disassembler. Stores all the

      * information in java class file.

      *

      * @author Sucheta Dambalkar (Adopted code from jdis)

      */

     static final class ClassData {

         private int magic;

         private int minor_version;

         private int major_version;

         private int cpool_count;

         private Object cpool[];

         private int access;

         private int this_class = 0;

         private int super_class;

         private int interfaces_count;

         private int[] interfaces = new int[0];

         private FieldData[] fields;

         private MethodData[] methods;

         private InnerClassData[] innerClasses;

         private int attributes_count;

         private AttrData[] attrs;

         private int source_cpx = 0;

         private byte tags[];

         private Hashtable indexHashAscii = new Hashtable();

         private String pkgPrefix = "";

         private int pkgPrefixLen = 0;

         /**

          * Read classfile to disassemble.

          */

         public ClassData(InputStream infile) throws IOException {

             this.read(new DataInputStream(infile));

         }

         /**

          * Reads and stores class file information.

          */

         public void read(DataInputStream in) throws IOException {

             // Read the header

             magic = in.readInt();

             if (magic != JAVA_MAGIC) {

                 throw new ClassFormatError("wrong magic: "

                     + toHex(magic) + ", expected "

                     + toHex(JAVA_MAGIC));

             }

             minor_version = in.readShort();

             major_version = in.readShort();

             if (major_version != JAVA_VERSION) {

             }

             // Read the constant pool

             readCP(in);

             access = in.readUnsignedShort();

             this_class = in.readUnsignedShort();

             super_class = in.readUnsignedShort();

             //Read interfaces.

             interfaces_count = in.readUnsignedShort();

             if (interfaces_count > 0) {

                 interfaces = new int[interfaces_count];

             }

             for (int i = 0; i < interfaces_count; i++) {

                 interfaces[i] = in.readShort();

             }

             // Read the fields

             readFields(in);

             // Read the methods

             readMethods(in);

             // Read the attributes

             attributes_count = in.readUnsignedShort();

             attrs = new AttrData[attributes_count];

             for (int k = 0; k < attributes_count; k++) {

                 int name_cpx = in.readUnsignedShort();

                 if (getTag(name_cpx) == CONSTANT_UTF8

                     && getString(name_cpx).equals("SourceFile")) {

                     if (in.readInt() != 2) {

                         throw new ClassFormatError("invalid attr length");

                     }

                     source_cpx = in.readUnsignedShort();

                     AttrData attr = new AttrData(this);

                     attr.read(name_cpx);

                     attrs[k] = attr;

                 } else if (getTag(name_cpx) == CONSTANT_UTF8

                     && getString(name_cpx).equals("InnerClasses")) {

                     int length = in.readInt();

                     int num = in.readUnsignedShort();

                     if (2 + num * 8 != length) {

                         throw new ClassFormatError("invalid attr length");

                     }

                     innerClasses = new InnerClassData[num];

                     for (int j = 0; j < num; j++) {

                         InnerClassData innerClass = new InnerClassData(this);

                         innerClass.read(in);

                         innerClasses[j] = innerClass;

                     }

                     AttrData attr = new AttrData(this);

                     attr.read(name_cpx);

                     attrs[k] = attr;

                 } else if (getTag(name_cpx) == CONSTANT_UTF8

                     && getString(name_cpx).equals("BootstrapMethods")) {

                     AttrData attr = new AttrData(this);

                     readBootstrapMethods(in);

                     attr.read(name_cpx);

                     attrs[k] = attr;

                 } else {

                     AttrData attr = new AttrData(this);

                     attr.read(name_cpx, in);

                     attrs[k] = attr;

                 }

             }

             in.close();

         } // end ClassData.read()

         void readBootstrapMethods(DataInputStream in) throws IOException {

             int attr_len = in.readInt();  //attr_length

             int number = in.readShort();

             for (int i = 0; i < number; i++) {

                 int ref = in.readShort();

                 int len = in.readShort();

                 int[] args = new int[len];

                 for (int j = 0; j < len; j++) {

                     args[j] = in.readShort();

                 }

                 System.err.print("ref: " + ref + " len: " + len + ":");

                 for (int j = 0; j < len; j++) {

                     System.err.print(" " + args[j]);

                 }

                 System.err.println();

             }

         }

         /**

          * Reads and stores constant pool info.

          */

         void readCP(DataInputStream in) throws IOException {

             cpool_count = in.readUnsignedShort();

             tags = new byte[cpool_count];

             cpool = new Object[cpool_count];

             for (int i = 1; i < cpool_count; i++) {

                 byte tag = in.readByte();

                 switch (tags[i] = tag) {

                     case CONSTANT_UTF8:

                         String str = in.readUTF();

                         indexHashAscii.put(cpool[i] = str, new Integer(i));

                         break;

                     case CONSTANT_INTEGER:

                         cpool[i] = new Integer(in.readInt());

                         break;

                     case CONSTANT_FLOAT:

                         cpool[i] = new Float(in.readFloat());

                         break;

                     case CONSTANT_LONG:

                         cpool[i++] = new Long(in.readLong());

                         break;

                     case CONSTANT_DOUBLE:

                         cpool[i++] = new Double(in.readDouble());

                         break;

                     case CONSTANT_CLASS:

                     case CONSTANT_STRING:

                         cpool[i] = new CPX(in.readUnsignedShort());

                         break;

                     case CONSTANT_FIELD:

                     case CONSTANT_METHOD:

                     case CONSTANT_INTERFACEMETHOD:

                     case CONSTANT_NAMEANDTYPE:

                         cpool[i] = new CPX2(in.readUnsignedShort(), in.readUnsignedShort());

                         break;

                     case CONSTANT_METHODHANDLE:

                         cpool[i] = new CPX2(in.readByte(), in.readUnsignedShort());

                         break;

                     case CONSTANT_METHODTYPE:

                         cpool[i] = new CPX(in.readUnsignedShort());

                         break;

                     case CONSTANT_INVOKEDYNAMIC:

                         cpool[i] = new CPX2(in.readUnsignedShort(), in.readUnsignedShort());

                         break;

                     case 0:

                     default:

                         throw new ClassFormatError("invalid constant type: " + (int) tags[i]);

                 }

             }

         }

         /**

          * Reads and strores field info.

          */

         protected void readFields(DataInputStream in) throws IOException {

             int fields_count = in.readUnsignedShort();

             fields = new FieldData[fields_count];

             for (int k = 0; k < fields_count; k++) {

                 FieldData field = new FieldData(this);

                 field.read(in);

                 fields[k] = field;

             }

         }

         /**

          * Reads and strores Method info.

          */

         protected void readMethods(DataInputStream in) throws IOException {

             int methods_count = in.readUnsignedShort();

             methods = new MethodData[methods_count];

             for (int k = 0; k < methods_count; k++) {

                 MethodData method = new MethodData(this);

                 method.read(in);

                 methods[k] = method;

             }

         }

         /**

          * get a string

          */

         public String getString(int n) {

             if (n == 0) {

                 return null;

             } else {

                 return (String) cpool[n];

             }

         }

         /**

          * get the type of constant given an index

          */

         public byte getTag(int n) {

             try {

                 return tags[n];

             } catch (ArrayIndexOutOfBoundsException e) {

                 return (byte) 100;

             }

         }

         static final String hexString = "0123456789ABCDEF";

         public static char hexTable[] = hexString.toCharArray();

         static String toHex(long val, int width) {

             StringBuffer s = new StringBuffer();

             for (int i = width - 1; i >= 0; i--) {

                 s.append(hexTable[((int) (val >> (4 * i))) & 0xF]);

             }

             return "0x" + s.toString();

         }

         static String toHex(long val) {

             int width;

             for (width = 16; width > 0; width--) {

                 if ((val >> (width - 1) * 4) != 0) {

                     break;

                 }

             }

             return toHex(val, width);

         }

         static String toHex(int val) {

             int width;

             for (width = 8; width > 0; width--) {

                 if ((val >> (width - 1) * 4) != 0) {

                     break;

                 }

             }

             return toHex(val, width);

         }

         /**

          * Returns the name of this class.

          */

         public String getClassName() {

             String res = null;

             if (this_class == 0) {

                 return res;

             }

             int tcpx;

             try {

                 if (tags[this_class] != CONSTANT_CLASS) {

                     return res; //"<CP["+cpx+"] is not a Class> ";

                 }

                 tcpx = ((CPX) cpool[this_class]).cpx;

             } catch (ArrayIndexOutOfBoundsException e) {

                 return res; // "#"+cpx+"// invalid constant pool index";

             } catch (Throwable e) {

                 return res; // "#"+cpx+"// ERROR IN DISASSEMBLER";

             }

             try {

                 return (String) (cpool[tcpx]);

             } catch (ArrayIndexOutOfBoundsException e) {

                 return res; // "class #"+scpx+"// invalid constant pool index";

             } catch (ClassCastException e) {

                 return res; // "class #"+scpx+"// invalid constant pool reference";

             } catch (Throwable e) {

                 return res; // "#"+cpx+"// ERROR IN DISASSEMBLER";

             }

         }

         /**

          * Returns the name of class at perticular index.

          */

         public String getClassName(int cpx) {

             String res = "#" + cpx;

             if (cpx == 0) {

                 return res;

             }

             int scpx;

             try {

                 if (tags[cpx] != CONSTANT_CLASS) {

                     return res; //"<CP["+cpx+"] is not a Class> ";

                 }

                 scpx = ((CPX) cpool[cpx]).cpx;

             } catch (ArrayIndexOutOfBoundsException e) {

                 return res; // "#"+cpx+"// invalid constant pool index";

             } catch (Throwable e) {

                 return res; // "#"+cpx+"// ERROR IN DISASSEMBLER";

             }

             res = "#" + scpx;

             try {

                 return (String) (cpool[scpx]);

             } catch (ArrayIndexOutOfBoundsException e) {

                 return res; // "class #"+scpx+"// invalid constant pool index";

             } catch (ClassCastException e) {

                 return res; // "class #"+scpx+"// invalid constant pool reference";

             } catch (Throwable e) {

                 return res; // "#"+cpx+"// ERROR IN DISASSEMBLER";

             }

         }

         public int getAccessFlags() {

             return access;

         }

         /**

          * Returns true if it is a class

          */

         public boolean isClass() {

             if ((access & ACC_INTERFACE) == 0) {

                 return true;

             }

             return false;

         }

         /**

          * Returns true if it is a interface.

          */

         public boolean isInterface() {

             if ((access & ACC_INTERFACE) != 0) {

                 return true;

             }

             return false;

         }

         /**

          * Returns true if this member is public, false otherwise.

          */

         public boolean isPublic() {

             return (access & ACC_PUBLIC) != 0;

         }

         /**

          * Returns the access of this class or interface.

          */

         public String[] getAccess() {

             Vector v = new Vector();

             if ((access & ACC_PUBLIC) != 0) {

                 v.addElement("public");

             }

             if ((access & ACC_FINAL) != 0) {

                 v.addElement("final");

             }

             if ((access & ACC_ABSTRACT) != 0) {

                 v.addElement("abstract");

             }

             String[] accflags = new String[v.size()];

             v.copyInto(accflags);

             return accflags;

         }

         /**

          * Returns list of innerclasses.

          */

         public InnerClassData[] getInnerClasses() {

             return innerClasses;

         }

         /**

          * Returns list of attributes.

          */

         final AttrData[] getAttributes() {

             return attrs;

         }

         public byte[] findAnnotationData(boolean classRetention) {

             String n = classRetention

                 ? "RuntimeInvisibleAnnotations" : // NOI18N

                 "RuntimeVisibleAnnotations"; // NOI18N

             return findAttr(n, attrs);

         }

         /**

          * Returns true if superbit is set.

          */

         public boolean isSuperSet() {

             if ((access & ACC_SUPER) != 0) {

                 return true;

             }

             return false;

         }

         /**

          * Returns super class name.

          */

         public String getSuperClassName() {

             String res = null;

             if (super_class == 0) {

                 return res;

             }

             int scpx;

             try {

                 if (tags[super_class] != CONSTANT_CLASS) {

                     return res; //"<CP["+cpx+"] is not a Class> ";

                 }

                 scpx = ((CPX) cpool[super_class]).cpx;

             } catch (ArrayIndexOutOfBoundsException e) {

                 return res; // "#"+cpx+"// invalid constant pool index";

             } catch (Throwable e) {

                 return res; // "#"+cpx+"// ERROR IN DISASSEMBLER";

             }

             try {

                 return (String) (cpool[scpx]);

             } catch (ArrayIndexOutOfBoundsException e) {

                 return res; // "class #"+scpx+"// invalid constant pool index";

             } catch (ClassCastException e) {

                 return res; // "class #"+scpx+"// invalid constant pool reference";

             } catch (Throwable e) {

                 return res; // "#"+cpx+"// ERROR IN DISASSEMBLER";

             }

         }

         /**

          * Returns list of super interfaces.

          */

         public String[] getSuperInterfaces() {

             String interfacenames[] = new String[interfaces.length];

             int interfacecpx = -1;

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

                 interfacecpx = ((CPX) cpool[interfaces[i]]).cpx;

                 interfacenames[i] = (String) (cpool[interfacecpx]);

             }

             return interfacenames;

         }

         /**

          * Returns string at prticular constant pool index.

          */

         public String getStringValue(int cpoolx) {

             try {

                 return ((String) cpool[cpoolx]);

             } catch (ArrayIndexOutOfBoundsException e) {

                 return "//invalid constant pool index:" + cpoolx;

             } catch (ClassCastException e) {

                 return "//invalid constant pool ref:" + cpoolx;

             }

         }

         /**

          * Returns list of field info.

          */

         public FieldData[] getFields() {

             return fields;

         }

         /**

          * Returns list of method info.

          */

         public MethodData[] getMethods() {

             return methods;

         }

         /**

          * Returns constant pool entry at that index.

          */

         public CPX2 getCpoolEntry(int cpx) {

             return ((CPX2) (cpool[cpx]));

         }

         public Object getCpoolEntryobj(int cpx) {

             return (cpool[cpx]);

         }

         /**

          * Returns index of this class.

          */

         public int getthis_cpx() {

             return this_class;

         }

         /**

          * Returns string at that index.

          */

         public String StringValue(int cpx) {

             return stringValue(cpx, false);

         }

         public String stringValue(int cpx, boolean textual) {

             return stringValue(cpx, textual, null);

         }

         public String stringValue(int cpx, String[] classRefs) {

             return stringValue(cpx, true, classRefs);

         }

         private String stringValue(int cpx, boolean textual, String[] refs) {

             if (cpx == 0) {

                 return "#0";

             }

             int tag;

             Object x;

             String suffix = "";

             try {

                 tag = tags[cpx];

                 x = cpool[cpx];

             } catch (IndexOutOfBoundsException e) {

                 return "<Incorrect CP index:" + cpx + ">";

             }

             if (x == null) {

                 return "<NULL>";

             }

             switch (tag) {

                 case CONSTANT_UTF8: {

                     if (!textual) {

                         return (String) x;

                     }

                     StringBuilder sb = new StringBuilder();

                     String s = (String) x;

                     for (int k = 0; k < s.length(); k++) {

                         char c = s.charAt(k);

                         switch (c) {

                             case '\\':

                                 sb.append('\\').append('\\');

                                 break;

                             case '\t':

                                 sb.append('\\').append('t');

                                 break;

                             case '\n':

                                 sb.append('\\').append('n');

                                 break;

                             case '\r':

                                 sb.append('\\').append('r');

                                 break;

                             case '\"':

                                 sb.append('\\').append('\"');

                                 break;

                             case '\u2028':

                                 sb.append("\\u2028");

                                 break;

                             case '\u2029':

                                 sb.append("\\u2029");

                                 break;

                             default:

                                 sb.append(c);

                         }

                     }

                     return sb.toString();

                 }

                 case CONSTANT_DOUBLE: {

                     Double d = (Double) x;

                     String sd = d.toString();

                     if (textual) {

                         return sd;

                     }

                     return sd + "d";

                 }

                 case CONSTANT_FLOAT: {

                     Float f = (Float) x;

                     String sf = (f).toString();

                     if (textual) {

                         return sf;

                     }

                     return sf + "f";

                 }

                 case CONSTANT_LONG: {

                     Long ln = (Long) x;

                     if (textual) {

                         return ln.toString();

                     }

                     return ln.toString() + 'l';

                 }

                 case CONSTANT_INTEGER: {

                     Integer in = (Integer) x;

                     return in.toString();

                 }

                 case CONSTANT_CLASS:

                     String jn = getClassName(cpx);

                     if (textual) {

                         if (refs != null) {

                             refs[0] = jn;

                         }

                         return jn;

                     }

                     return javaName(jn);

                 case CONSTANT_STRING:

                     String sv = stringValue(((CPX) x).cpx, textual);

                     if (textual) {

                         return '"' + sv + '"';

                     } else {

                         return sv;

                     }

                 case CONSTANT_FIELD:

                 case CONSTANT_METHOD:

                 case CONSTANT_INTERFACEMETHOD:

                     //return getShortClassName(((CPX2)x).cpx1)+"."+StringValue(((CPX2)x).cpx2);

                     return javaName(getClassName(((CPX2) x).cpx1)) + "." + StringValue(((CPX2) x).cpx2);

                 case CONSTANT_NAMEANDTYPE:

                     return getName(((CPX2) x).cpx1) + ":" + StringValue(((CPX2) x).cpx2);

                 default:

                     return "UnknownTag"; //TBD

             }

         }

         /**

          * Returns resolved java type name.

          */

         public String javaName(String name) {

             if (name == null) {

                 return "null";

             }

             int len = name.length();

             if (len == 0) {

                 return "\"\"";

             }

             int cc = '/';

             fullname:

             { // xxx/yyy/zzz

                 int cp;

                 for (int k = 0; k < len; k += Character.charCount(cp)) {

                     cp = name.codePointAt(k);

                     if (cc == '/') {

                         if (!isJavaIdentifierStart(cp)) {

                             break fullname;

                         }

                     } else if (cp != '/') {

                         if (!isJavaIdentifierPart(cp)) {

                             break fullname;

                         }

                     }

                     cc = cp;

                 }

                 return name;

             }

             return "\"" + name + "\"";

         }

         public String getName(int cpx) {

             String res;

             try {

                 return javaName((String) cpool[cpx]); //.replace('/','.');

             } catch (ArrayIndexOutOfBoundsException e) {

                 return "<invalid constant pool index:" + cpx + ">";

             } catch (ClassCastException e) {

                 return "<invalid constant pool ref:" + cpx + ">";

             }

         }

         /**

          * Returns unqualified class name.

          */

         public String getShortClassName(int cpx) {

             String classname = javaName(getClassName(cpx));

             pkgPrefixLen = classname.lastIndexOf("/") + 1;

             if (pkgPrefixLen != 0) {

                 pkgPrefix = classname.substring(0, pkgPrefixLen);

                 if (classname.startsWith(pkgPrefix)) {

                     return classname.substring(pkgPrefixLen);

                 }

             }

             return classname;

         }

         /**

          * Returns source file name.

          */

         public String getSourceName() {

             return getName(source_cpx);

         }

         /**

          * Returns package name.

          */

         public String getPkgName() {

             String classname = getClassName(this_class);

             pkgPrefixLen = classname.lastIndexOf("/") + 1;

             if (pkgPrefixLen != 0) {

                 pkgPrefix = classname.substring(0, pkgPrefixLen);

                 return /* ("package  " + */ pkgPrefix.substring(0, pkgPrefixLen - 1) /* + ";\n") */;

             } else {

                 return null;

             }

         }

         /**

          * Returns total constant pool entry count.

          */

         public int getCpoolCount() {

             return cpool_count;

         }

         /**

          * Returns minor version of class file.

          */

         public int getMinor_version() {

             return minor_version;

         }

         /**

          * Returns major version of class file.

          */

         public int getMajor_version() {

             return major_version;

         }

         private boolean isJavaIdentifierStart(int cp) {

             return ('a' <= cp && cp <= 'z') || ('A' <= cp && cp <= 'Z');

         }

         private boolean isJavaIdentifierPart(int cp) {

             return isJavaIdentifierStart(cp) || ('0' <= cp && cp <= '9');

         }

         public String[] getNameAndType(int indx) {

             return getNameAndType(indx, 0, new String[2]);

         }

         private String[] getNameAndType(int indx, int at, String[] arr) {

             CPX2 c2 = getCpoolEntry(indx);

             arr[at] = StringValue(c2.cpx1);

             arr[at + 1] = StringValue(c2.cpx2);

             return arr;

         }

         public String[] getFieldInfoName(int indx) {

             CPX2 c2 = getCpoolEntry(indx);

             String[] arr = new String[3];

             arr[0] = getClassName(c2.cpx1);

             return getNameAndType(c2.cpx2, 1, arr);

         }

         public MethodData findMethod(String name, String signature) {

             for (MethodData md: methods) {

                 if (md.getName().equals(name)

                         && md.getInternalSig().equals(signature)) {

                     return md;

                 }

             }

             // not found

             return null;

         }

         public FieldData findField(String name, String signature) {

             for (FieldData fd: fields) {

                 if (fd.getName().equals(name)

                         && fd.getInternalSig().equals(signature)) {

                     return fd;

                 }

             }

             // not found

             return null;

         }

         static byte[] findAttr(String n, AttrData[] attrs) {

             for (AttrData ad : attrs) {

                 if (n.equals(ad.getAttrName())) {

                     return ad.getData();

                 }

             }

             return null;

         }

     }

     /**

      * Strores field data informastion.

      *

      * @author Sucheta Dambalkar (Adopted code from jdis)

      */

     static class FieldData {

         ClassData cls;

         int access;

         int name_index;

         int descriptor_index;

         int attributes_count;

         int value_cpx = -1;

         boolean isSynthetic = false;

         boolean isDeprecated = false;

         Vector attrs;

         public FieldData(ClassData cls) {

             this.cls = cls;

         }

         /**

          * Read and store field info.

          */

         public void read(DataInputStream in) throws IOException {

             access = in.readUnsignedShort();

             name_index = in.readUnsignedShort();

             descriptor_index = in.readUnsignedShort();

             // Read the attributes

             int attributes_count = in.readUnsignedShort();

             attrs = new Vector(attributes_count);

             for (int i = 0; i < attributes_count; i++) {

                 int attr_name_index = in.readUnsignedShort();

                 if (cls.getTag(attr_name_index) != CONSTANT_UTF8) {

                     continue;

                 }

                 String attr_name = cls.getString(attr_name_index);

                 if (attr_name.equals("ConstantValue")) {

                     if (in.readInt() != 2) {

                         throw new ClassFormatError("invalid ConstantValue attr length");

                     }

                     value_cpx = in.readUnsignedShort();

                     AttrData attr = new AttrData(cls);

                     attr.read(attr_name_index);

                     attrs.addElement(attr);

                 } else if (attr_name.equals("Synthetic")) {

                     if (in.readInt() != 0) {

                         throw new ClassFormatError("invalid Synthetic attr length");

                     }

                     isSynthetic = true;

                     AttrData attr = new AttrData(cls);

                     attr.read(attr_name_index);

                     attrs.addElement(attr);

                 } else if (attr_name.equals("Deprecated")) {

                     if (in.readInt() != 0) {

                         throw new ClassFormatError("invalid Synthetic attr length");

                     }

                     isDeprecated = true;

                     AttrData attr = new AttrData(cls);

                     attr.read(attr_name_index);

                     attrs.addElement(attr);

                 } else {

                     AttrData attr = new AttrData(cls);

                     attr.read(attr_name_index, in);

                     attrs.addElement(attr);

                 }

             }

         }  // end read

         public boolean isStatic() {

             return (access & ACC_STATIC) != 0;

         }

         /**

          * Returns access of a field.

          */

         public String[] getAccess() {

             Vector v = new Vector();

             if ((access & ACC_PUBLIC) != 0) {

                 v.addElement("public");

             }

             if ((access & ACC_PRIVATE) != 0) {

                 v.addElement("private");

             }

             if ((access & ACC_PROTECTED) != 0) {

                 v.addElement("protected");

             }

             if ((access & ACC_STATIC) != 0) {

                 v.addElement("static");

             }

             if ((access & ACC_FINAL) != 0) {

                 v.addElement("final");

             }

             if ((access & ACC_VOLATILE) != 0) {

                 v.addElement("volatile");

             }

             if ((access & ACC_TRANSIENT) != 0) {

                 v.addElement("transient");

             }

             String[] accflags = new String[v.size()];

             v.copyInto(accflags);

             return accflags;

         }

         /**

          * Returns name of a field.

          */

         public String getName() {

             return cls.getStringValue(name_index);

         }

         /**

          * Returns internal signature of a field

          */

         public String getInternalSig() {

             return cls.getStringValue(descriptor_index);

         }

         /**

          * Returns true if field is synthetic.

          */

         public boolean isSynthetic() {

             return isSynthetic;

         }

         /**

          * Returns true if field is deprecated.

          */

         public boolean isDeprecated() {

             return isDeprecated;

         }

         public boolean hasConstantValue() {

             return value_cpx != -1;

         }

         /**

          * Returns list of attributes of field.

          */

         public Vector getAttributes() {

             return attrs;

         }

         public byte[] findAnnotationData(boolean classRetention) {

             String n = classRetention

                 ? "RuntimeInvisibleAnnotations" : // NOI18N

                 "RuntimeVisibleAnnotations"; // NOI18N

             AttrData[] arr = new AttrData[attrs.size()];

             attrs.copyInto(arr);

             return ClassData.findAttr(n, arr);

         }

     }

     /**

      * A JavaScript optimized replacement for Hashtable.

      *

      * @author Jaroslav Tulach <jtulach@netbeans.org>

      */

     private static final class Hashtable {

         private Object[] keys;

         private Object[] values;

         Hashtable(int i) {

             this();

         }

         Hashtable(int i, double d) {

             this();

         }

         Hashtable() {

         }

         synchronized void put(Object key, Object val) {

             int[] where = {-1, -1};

             Object found = get(key, where);

             if (where[0] != -1) {

                 // key exists

                 values[where[0]] = val;

             } else {

                 if (where[1] != -1) {

                     // null found

                     keys[where[1]] = key;

                     values[where[1]] = val;

                 } else {

                     if (keys == null) {

                         keys = new Object[11];

                         values = new Object[11];

                         keys[0] = key;

                         values[0] = val;

                     } else {

                         Object[] newKeys = new Object[keys.length * 2];

                         Object[] newValues = new Object[values.length * 2];

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

                             newKeys[i] = keys[i];

                             newValues[i] = values[i];

                         }

                         newKeys[keys.length] = key;

                         newValues[keys.length] = val;

                         keys = newKeys;

                         values = newValues;

                     }

                 }

             }

         }

         Object get(Object key) {

             return get(key, null);

         }

         private synchronized Object get(Object key, int[] foundAndNull) {

             if (keys == null) {

                 return null;

             }

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

                 if (keys[i] == null) {

                     if (foundAndNull != null) {

                         foundAndNull[1] = i;

                     }

                 } else if (keys[i].equals(key)) {

                     if (foundAndNull != null) {

                         foundAndNull[0] = i;

                     }

                     return values[i];

                 }

             }

             return null;

         }

     }

     /**

      * Strores InnerClass data informastion.

      *

      * @author Sucheta Dambalkar (Adopted code from jdis)

      */

     private static class InnerClassData {

         ClassData cls;

         int inner_class_info_index, outer_class_info_index, inner_name_index, access;

         public InnerClassData(ClassData cls) {

             this.cls = cls;

         }

         /**

          * Read Innerclass attribute data.

          */

         public void read(DataInputStream in) throws IOException {

             inner_class_info_index = in.readUnsignedShort();

             outer_class_info_index = in.readUnsignedShort();

             inner_name_index = in.readUnsignedShort();

             access = in.readUnsignedShort();

         }  // end read

         /**

          * Returns the access of this class or interface.

          */

         public String[] getAccess() {

             Vector v = new Vector();

             if ((access & ACC_PUBLIC) != 0) {

                 v.addElement("public");

             }

             if ((access & ACC_FINAL) != 0) {

                 v.addElement("final");

             }

             if ((access & ACC_ABSTRACT) != 0) {

                 v.addElement("abstract");

             }

             String[] accflags = new String[v.size()];

             v.copyInto(accflags);

             return accflags;

         }

     } // end InnerClassData

     /**

      * Strores LineNumberTable data information.

      *

      * @author Sucheta Dambalkar (Adopted code from jdis)

      */

     private static class LineNumData {

         short start_pc, line_number;

         public LineNumData() {

         }

         /**

          * Read LineNumberTable attribute.

          */

         public LineNumData(DataInputStream in) throws IOException {

             start_pc = in.readShort();

             line_number = in.readShort();

         }

     }

     /**

      * Strores LocalVariableTable data information.

      *

      * @author Sucheta Dambalkar (Adopted code from jdis)

      */

     private static class LocVarData {

         short start_pc, length, name_cpx, sig_cpx, slot;

         public LocVarData() {

         }

         /**

          * Read LocalVariableTable attribute.

          */

         public LocVarData(DataInputStream in) throws IOException {

             start_pc = in.readShort();

             length = in.readShort();

             name_cpx = in.readShort();

             sig_cpx = in.readShort();

             slot = in.readShort();

         }

     }

     /**

      * Strores method data informastion.

      *

      * @author Sucheta Dambalkar (Adopted code from jdis)

      */

     static class MethodData {

         ClassData cls;

         int access;

         int name_index;

         int descriptor_index;

         int attributes_count;

         byte[] code;

         Vector exception_table = new Vector(0);

         Vector lin_num_tb = new Vector(0);

         Vector loc_var_tb = new Vector(0);

         StackMapTableData[] stackMapTable;

         StackMapData[] stackMap;

         int[] exc_index_table = null;

         Vector attrs = new Vector(0);

         Vector code_attrs = new Vector(0);

         int max_stack, max_locals;

         boolean isSynthetic = false;

         boolean isDeprecated = false;

         public MethodData(ClassData cls) {

             this.cls = cls;

         }

         /**

          * Read method info.

          */

         public void read(DataInputStream in) throws IOException {

             access = in.readUnsignedShort();

             name_index = in.readUnsignedShort();

             descriptor_index = in.readUnsignedShort();

             int attributes_count = in.readUnsignedShort();

             for (int i = 0; i < attributes_count; i++) {

                 int attr_name_index = in.readUnsignedShort();

                 readAttr:

                 {

                     if (cls.getTag(attr_name_index) == CONSTANT_UTF8) {

                         String attr_name = cls.getString(attr_name_index);

                         if (attr_name.equals("Code")) {

                             readCode(in);

                             AttrData attr = new AttrData(cls);

                             attr.read(attr_name_index);

                             attrs.addElement(attr);

                             break readAttr;

                         } else if (attr_name.equals("Exceptions")) {

                             readExceptions(in);

                             AttrData attr = new AttrData(cls);

                             attr.read(attr_name_index);

                             attrs.addElement(attr);

                             break readAttr;

                         } else if (attr_name.equals("Synthetic")) {

                             if (in.readInt() != 0) {

                                 throw new ClassFormatError("invalid Synthetic attr length");

                             }

                             isSynthetic = true;

                             AttrData attr = new AttrData(cls);

                             attr.read(attr_name_index);

                             attrs.addElement(attr);

                             break readAttr;

                         } else if (attr_name.equals("Deprecated")) {

                             if (in.readInt() != 0) {

                                 throw new ClassFormatError("invalid Synthetic attr length");

                             }

                             isDeprecated = true;

                             AttrData attr = new AttrData(cls);

                             attr.read(attr_name_index);

                             attrs.addElement(attr);

                             break readAttr;

                         }

                     }

                     AttrData attr = new AttrData(cls);

                     attr.read(attr_name_index, in);

                     attrs.addElement(attr);

                 }

             }

         }

         /**

          * Read code attribute info.

          */

         public void readCode(DataInputStream in) throws IOException {

             int attr_length = in.readInt();

             max_stack = in.readUnsignedShort();

             max_locals = in.readUnsignedShort();

             int codelen = in.readInt();

             code = new byte[codelen];

             int totalread = 0;

             while (totalread < codelen) {

                 totalread += in.read(code, totalread, codelen - totalread);

             }

             //      in.read(code, 0, codelen);

             int clen = 0;

             readExceptionTable(in);

             int code_attributes_count = in.readUnsignedShort();

             for (int k = 0; k < code_attributes_count; k++) {

                 int table_name_index = in.readUnsignedShort();

                 int table_name_tag = cls.getTag(table_name_index);

                 AttrData attr = new AttrData(cls);

                 if (table_name_tag == CONSTANT_UTF8) {

                     String table_name_tstr = cls.getString(table_name_index);

                     if (table_name_tstr.equals("LineNumberTable")) {

                         readLineNumTable(in);

                         attr.read(table_name_index);

                     } else if (table_name_tstr.equals("LocalVariableTable")) {

                         readLocVarTable(in);

                         attr.read(table_name_index);

                     } else if (table_name_tstr.equals("StackMapTable")) {

                         readStackMapTable(in);

                         attr.read(table_name_index);

                     } else if (table_name_tstr.equals("StackMap")) {

                         readStackMap(in);

                         attr.read(table_name_index);

                     } else {

                         attr.read(table_name_index, in);

                     }

                     code_attrs.addElement(attr);

                     continue;

                 }

                 attr.read(table_name_index, in);

                 code_attrs.addElement(attr);

             }

         }

         /**

          * Read exception table info.

          */

         void readExceptionTable(DataInputStream in) throws IOException {

             int exception_table_len = in.readUnsignedShort();

             exception_table = new Vector(exception_table_len);

             for (int l = 0; l < exception_table_len; l++) {

                 exception_table.addElement(new TrapData(in, l));

             }

         }

         /**

          * Read LineNumberTable attribute info.

          */

         void readLineNumTable(DataInputStream in) throws IOException {

             int attr_len = in.readInt(); // attr_length

             int lin_num_tb_len = in.readUnsignedShort();

             lin_num_tb = new Vector(lin_num_tb_len);

             for (int l = 0; l < lin_num_tb_len; l++) {

                 lin_num_tb.addElement(new LineNumData(in));

             }

         }

         /**

          * Read LocalVariableTable attribute info.

          */

         void readLocVarTable(DataInputStream in) throws IOException {

             int attr_len = in.readInt(); // attr_length

             int loc_var_tb_len = in.readUnsignedShort();

             loc_var_tb = new Vector(loc_var_tb_len);

             for (int l = 0; l < loc_var_tb_len; l++) {

                 loc_var_tb.addElement(new LocVarData(in));

             }

         }

         /**

          * Read Exception attribute info.

          */

         public void readExceptions(DataInputStream in) throws IOException {

             int attr_len = in.readInt(); // attr_length in prog

             int num_exceptions = in.readUnsignedShort();

             exc_index_table = new int[num_exceptions];

             for (int l = 0; l < num_exceptions; l++) {

                 int exc = in.readShort();

                 exc_index_table[l] = exc;

             }

         }

         /**

          * Read StackMapTable attribute info.

          */

         void readStackMapTable(DataInputStream in) throws IOException {

             int attr_len = in.readInt();  //attr_length

             int stack_map_tb_len = in.readUnsignedShort();

             stackMapTable = new StackMapTableData[stack_map_tb_len];

             for (int i = 0; i < stack_map_tb_len; i++) {

                 stackMapTable[i] = StackMapTableData.getInstance(in, this);

             }

         }

         /**

          * Read StackMap attribute info.

          */

         void readStackMap(DataInputStream in) throws IOException {

             int attr_len = in.readInt();  //attr_length

             int stack_map_len = in.readUnsignedShort();

             stackMap = new StackMapData[stack_map_len];

             for (int i = 0; i < stack_map_len; i++) {

                 stackMap[i] = new StackMapData(in, this);

             }

         }

         /**

          * Return access of the method.

          */

         public int getAccess() {

             return access;

         }

         /**

          * Return name of the method.

          */

         public String getName() {

             return cls.getStringValue(name_index);

         }

         /**

          * Return internal siganature of the method.

          */

         public String getInternalSig() {

             return cls.getStringValue(descriptor_index);

         }

         /**

          * Return code attribute data of a method.

          */

         public byte[] getCode() {

             return code;

         }

         /**

          * Return LineNumberTable size.

          */

         public int getnumlines() {

             return lin_num_tb.size();

         }

         /**

          * Return LineNumberTable

          */

         public Vector getlin_num_tb() {

             return lin_num_tb;

         }

         /**

          * Return LocalVariableTable size.

          */

         public int getloc_var_tbsize() {

             return loc_var_tb.size();

         }

         /**

          * Return LocalVariableTable.

          */

         public Vector getloc_var_tb() {

             return loc_var_tb;

         }

         /**

          * Return StackMap.

          */

         public StackMapData[] getStackMap() {

             return stackMap;

         }

         /**

          * Return StackMapTable.

          */

         public StackMapTableData[] getStackMapTable() {

             return stackMapTable;

         }

         public StackMapIterator createStackMapIterator() {

             return new StackMapIterator(this);

         }

         /**

          * Return true if method is static

          */

         public boolean isStatic() {

             if ((access & ACC_STATIC) != 0) {

                 return true;

             }

             return false;

         }

         /**

          * Return max depth of operand stack.

          */

         public int getMaxStack() {

             return max_stack;

         }

         /**

          * Return number of local variables.

          */

         public int getMaxLocals() {

             return max_locals;

         }

         /**

          * Return exception index table in Exception attribute.

          */

         public int[] get_exc_index_table() {

             return exc_index_table;

         }

         /**

          * Return exception table in code attributre.

          */

         public TrapDataIterator getTrapDataIterator() {

             return new TrapDataIterator(exception_table);

         }

         /**

          * Return method attributes.

          */

         public Vector getAttributes() {

             return attrs;

         }

         /**

          * Return code attributes.

          */

         public Vector getCodeAttributes() {

             return code_attrs;

         }

         /**

          * Return true if method id synthetic.

          */

         public boolean isSynthetic() {

             return isSynthetic;

         }

         /**

          * Return true if method is deprecated.

          */

         public boolean isDeprecated() {

             return isDeprecated;

         }

         public byte[] findAnnotationData(boolean classRetention) {

             String n = classRetention

                 ? "RuntimeInvisibleAnnotations" : // NOI18N

                 "RuntimeVisibleAnnotations"; // NOI18N

             AttrData[] arr = new AttrData[attrs.size()];

             attrs.copyInto(arr);

             return ClassData.findAttr(n, arr);

         }

         public boolean isConstructor() {

             return "<init>".equals(getName());

         }

     }

     /* represents one entry of StackMap attribute

      */

     private static class StackMapData {

         final int offset;

         final int[] locals;

         final int[] stack;

         StackMapData(int offset, int[] locals, int[] stack) {

             this.offset = offset;

             this.locals = locals;

             this.stack = stack;

         }

         StackMapData(DataInputStream in, MethodData method) throws IOException {

             offset = in.readUnsignedShort();

             int local_size = in.readUnsignedShort();

             locals = readTypeArray(in, local_size, method);

             int stack_size = in.readUnsignedShort();

             stack = readTypeArray(in, stack_size, method);

         }

         static final int[] readTypeArray(DataInputStream in, int length, MethodData method) throws IOException {

             int[] types = new int[length];

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

                 types[i] = readType(in, method);

             }

             return types;

         }

         static final int readType(DataInputStream in, MethodData method) throws IOException {

             int type = in.readUnsignedByte();

             if (type == ITEM_Object || type == ITEM_NewObject) {

                 type = type | (in.readUnsignedShort() << 8);

             }

             return type;

         }

     }

     static final class StackMapIterator {

         private final StackMapTableData[] stackMapTable;

         private final TypeArray argTypes;

         private final TypeArray localTypes;

         private final TypeArray stackTypes;

         private int nextFrameIndex;

         private int lastFrameByteCodeOffset;

         private int byteCodeOffset;

         StackMapIterator(final MethodData methodData) {

             this(methodData.getStackMapTable(),

                 methodData.getInternalSig(),

                 methodData.isStatic());

         }

         StackMapIterator(final StackMapTableData[] stackMapTable,

             final String methodSignature,

             final boolean isStaticMethod) {

             this.stackMapTable = (stackMapTable != null)

                 ? stackMapTable

                 : new StackMapTableData[0];

             argTypes = getArgTypes(methodSignature, isStaticMethod);

             localTypes = new TypeArray();

             stackTypes = new TypeArray();

             localTypes.addAll(argTypes);

             lastFrameByteCodeOffset = -1;

             advanceBy(0);

         }

         public boolean isEmpty() {

             return stackMapTable.length == 0;

         }

         public String getFrameAsString() {

             return (nextFrameIndex == 0)

                 ? StackMapTableData.toString("INITIAL", 0, null, null)

                 : stackMapTable[nextFrameIndex - 1].toString();

         }

         public int getFrameIndex() {

             return nextFrameIndex;

         }

         public TypeArray getFrameStack() {

             return stackTypes;

         }

         public TypeArray getFrameLocals() {

             return localTypes;

         }

         public TypeArray getArguments() {

             return argTypes;

         }

         public void advanceBy(final int numByteCodes) {

             if (numByteCodes < 0) {

                 throw new IllegalStateException("Forward only iterator");

             }

             byteCodeOffset += numByteCodes;

             while ((nextFrameIndex < stackMapTable.length)

                 && ((byteCodeOffset - lastFrameByteCodeOffset)

                 >= (stackMapTable[nextFrameIndex].offsetDelta

                 + 1))) {

                 final StackMapTableData nextFrame = stackMapTable[nextFrameIndex];

                 lastFrameByteCodeOffset += nextFrame.offsetDelta + 1;

                 nextFrame.applyTo(localTypes, stackTypes);

                 ++nextFrameIndex;

             }

         }

         public void advanceTo(final int nextByteCodeOffset) {

             advanceBy(nextByteCodeOffset - byteCodeOffset);

         }

         private static TypeArray getArgTypes(final String methodSignature,

             final boolean isStaticMethod) {

             final TypeArray argTypes = new TypeArray();

             if (!isStaticMethod) {

                 argTypes.add(ITEM_Object);

             }

             if (methodSignature.charAt(0) != '(') {

                 throw new IllegalArgumentException("Invalid method signature");

             }

             final int length = methodSignature.length();

             boolean skipType = false;

             int argType;

             for (int i = 1; i < length; ++i) {

                 switch (methodSignature.charAt(i)) {

                     case 'B':

                     case 'C':

                     case 'S':

                     case 'Z':

                     case 'I':

                         argType = ITEM_Integer;

                         break;

                     case 'J':

                         argType = ITEM_Long;

                         break;

                     case 'F':

                         argType = ITEM_Float;

                         break;

                     case 'D':

                         argType = ITEM_Double;

                         break;

                     case 'L': {

                         i = methodSignature.indexOf(';', i + 1);

                         if (i == -1) {

                             throw new IllegalArgumentException(

                                 "Invalid method signature");

                         }

                         argType = ITEM_Object;

                         break;

                     }

                     case ')':

                         // not interested in the return value type

                         return argTypes;

                     case '[':

                         if (!skipType) {

                             argTypes.add(ITEM_Object);

                             skipType = true;

                         }

                         continue;

                     default:

                         throw new IllegalArgumentException(

                             "Invalid method signature");

                 }

                 if (!skipType) {

                     argTypes.add(argType);

                 } else {

                     skipType = false;

                 }

             }

             return argTypes;

         }

     }

     /* represents one entry of StackMapTable attribute

      */

     private static abstract class StackMapTableData {

         final int frameType;

         int offsetDelta;

         StackMapTableData(int frameType) {

             this.frameType = frameType;

         }

         abstract void applyTo(TypeArray localTypes, TypeArray stackTypes);

         protected static String toString(

             final String frameType,

             final int offset,

             final int[] localTypes,

             final int[] stackTypes) {

             final StringBuilder sb = new StringBuilder(frameType);

             sb.append("(off: +").append(offset);

             if (localTypes != null) {

                 sb.append(", locals: ");

                 appendTypes(sb, localTypes);

             }

             if (stackTypes != null) {

                 sb.append(", stack: ");

                 appendTypes(sb, stackTypes);

             }

             sb.append(')');

             return sb.toString();

         }

         private static void appendTypes(final StringBuilder sb, final int[] types) {

             sb.append('[');

             if (types.length > 0) {

                 sb.append(TypeArray.typeString(types[0]));

                 for (int i = 1; i < types.length; ++i) {

                     sb.append(", ");

                     sb.append(TypeArray.typeString(types[i]));

                 }

             }

             sb.append(']');

         }

         private static class SameFrame extends StackMapTableData {

             SameFrame(int frameType, int offsetDelta) {

                 super(frameType);

                 this.offsetDelta = offsetDelta;

             }

             @Override

             void applyTo(TypeArray localTypes, TypeArray stackTypes) {

                 stackTypes.clear();

             }

             @Override

             public String toString() {

                 return toString("SAME" + ((frameType == SAME_FRAME_EXTENDED)

                     ? "_FRAME_EXTENDED" : ""),

                     offsetDelta,

                     null, null);

             }

         }

         private static class SameLocals1StackItem extends StackMapTableData {

             final int[] stack;

             SameLocals1StackItem(int frameType, int offsetDelta, int[] stack) {

                 super(frameType);

                 this.offsetDelta = offsetDelta;

                 this.stack = stack;

             }

             @Override

             void applyTo(TypeArray localTypes, TypeArray stackTypes) {

                 stackTypes.setAll(stack);

             }

             @Override

             public String toString() {

                 return toString(

                     "SAME_LOCALS_1_STACK_ITEM"

                     + ((frameType == SAME_LOCALS_1_STACK_ITEM_EXTENDED)

                     ? "_EXTENDED" : ""),

                     offsetDelta,

                     null, stack);

             }

         }

         private static class ChopFrame extends StackMapTableData {

             ChopFrame(int frameType, int offsetDelta) {

                 super(frameType);

                 this.offsetDelta = offsetDelta;

             }

             @Override

             void applyTo(TypeArray localTypes, TypeArray stackTypes) {

                 localTypes.setSize(localTypes.getSize()

                     - (SAME_FRAME_EXTENDED - frameType));

                 stackTypes.clear();

             }

             @Override

             public String toString() {

                 return toString("CHOP", offsetDelta, null, null);

             }

         }

         private static class AppendFrame extends StackMapTableData {

             final int[] locals;

             AppendFrame(int frameType, int offsetDelta, int[] locals) {

                 super(frameType);

                 this.offsetDelta = offsetDelta;

                 this.locals = locals;

             }

             @Override

             void applyTo(TypeArray localTypes, TypeArray stackTypes) {

                 localTypes.addAll(locals);

                 stackTypes.clear();

             }

             @Override

             public String toString() {

                 return toString("APPEND", offsetDelta, locals, null);

             }

         }

         private static class FullFrame extends StackMapTableData {

             final int[] locals;

             final int[] stack;

             FullFrame(int offsetDelta, int[] locals, int[] stack) {

                 super(FULL_FRAME);

                 this.offsetDelta = offsetDelta;

                 this.locals = locals;

                 this.stack = stack;

             }

             @Override

             void applyTo(TypeArray localTypes, TypeArray stackTypes) {

                 localTypes.setAll(locals);

                 stackTypes.setAll(stack);

             }

             @Override

             public String toString() {

                 return toString("FULL", offsetDelta, locals, stack);

             }

         }

         static StackMapTableData getInstance(DataInputStream in, MethodData method)

             throws IOException {

             int frameType = in.readUnsignedByte();

             if (frameType < SAME_FRAME_BOUND) {

                 // same_frame

                 return new SameFrame(frameType, frameType);

             } else if (SAME_FRAME_BOUND <= frameType && frameType < SAME_LOCALS_1_STACK_ITEM_BOUND) {

                 // same_locals_1_stack_item_frame

                 // read additional single stack element

                 return new SameLocals1StackItem(frameType,

                     (frameType - SAME_FRAME_BOUND),

                     StackMapData.readTypeArray(in, 1, method));

             } else if (frameType == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {

                 // same_locals_1_stack_item_extended

                 return new SameLocals1StackItem(frameType,

                     in.readUnsignedShort(),

                     StackMapData.readTypeArray(in, 1, method));

             } else if (SAME_LOCALS_1_STACK_ITEM_EXTENDED < frameType && frameType < SAME_FRAME_EXTENDED) {

                 // chop_frame or same_frame_extended

                 return new ChopFrame(frameType, in.readUnsignedShort());

             } else if (frameType == SAME_FRAME_EXTENDED) {

                 // chop_frame or same_frame_extended

                 return new SameFrame(frameType, in.readUnsignedShort());

             } else if (SAME_FRAME_EXTENDED < frameType && frameType < FULL_FRAME) {

                 // append_frame

                 return new AppendFrame(frameType, in.readUnsignedShort(),

                     StackMapData.readTypeArray(in, frameType - SAME_FRAME_EXTENDED, method));

             } else if (frameType == FULL_FRAME) {

                 // full_frame

                 int offsetDelta = in.readUnsignedShort();

                 int locals_size = in.readUnsignedShort();

                 int[] locals = StackMapData.readTypeArray(in, locals_size, method);

                 int stack_size = in.readUnsignedShort();

                 int[] stack = StackMapData.readTypeArray(in, stack_size, method);

                 return new FullFrame(offsetDelta, locals, stack);

             } else {

                 throw new ClassFormatError("unrecognized frame_type in StackMapTable");

             }

         }

     }

     /**

      * Stores exception table data in code attribute.

      *

      * @author Sucheta Dambalkar (Adopted code from jdis)

      */

     static final class TrapData {

         public final short start_pc;

         public final short end_pc;

         public final short handler_pc;

         public final short catch_cpx;

         final int num;

         /**

          * Read and store exception table data in code attribute.

          */

         TrapData(DataInputStream in, int num) throws IOException {

             this.num = num;

             start_pc = in.readShort();

             end_pc = in.readShort();

             handler_pc = in.readShort();

             catch_cpx = in.readShort();

         }

         /**

          * returns recommended identifier

          */

         public String ident() {

             return "t" + num;

         }

     }

     /**

      *

      * @author Jaroslav Tulach <jtulach@netbeans.org>

      */

     static final class TrapDataIterator {

         private final Hashtable exStart = new Hashtable();

         private final Hashtable exStop = new Hashtable();

         private TrapData[] current = new TrapData[10];

         private int currentCount;

         TrapDataIterator(Vector exceptionTable) {

             for (int i = 0; i < exceptionTable.size(); i++) {

                 final TrapData td = (TrapData) exceptionTable.elementAt(i);

                 put(exStart, td.start_pc, td);

                 put(exStop, td.end_pc, td);

             }

         }

         private static void put(Hashtable h, short key, TrapData td) {

             Short s = Short.valueOf((short) key);

             Vector v = (Vector) h.get(s);

             if (v == null) {

                 v = new Vector(1);

                 h.put(s, v);

             }

             v.add(td);

         }

         private boolean processAll(Hashtable h, Short key, boolean add) {

             boolean change = false;

             Vector v = (Vector) h.get(key);

             if (v != null) {

                 int s = v.size();

                 for (int i = 0; i < s; i++) {

                     TrapData td = (TrapData) v.elementAt(i);

                     if (add) {

                         add(td);

                         change = true;

                     } else {

                         remove(td);

                         change = true;

                     }

                 }

             }

             return change;

         }

         public boolean advanceTo(int i) {

             Short s = Short.valueOf((short) i);

             boolean ch1 = processAll(exStart, s, true);

             boolean ch2 = processAll(exStop, s, false);

             return ch1 || ch2;

         }

         public boolean useTry() {

             return currentCount > 0;

         }

         public TrapData[] current() {

             TrapData[] copy = new TrapData[currentCount];

             for (int i = 0; i < currentCount; i++) {

                 copy[i] = current[i];

             }

             return copy;

         }

         private void add(TrapData e) {

             if (currentCount == current.length) {

                 TrapData[] data = new TrapData[currentCount * 2];

                 for (int i = 0; i < currentCount; i++) {

                     data[i] = current[i];

                 }

                 current = data;

             }

             current[currentCount++] = e;

         }

         private void remove(TrapData e) {

             if (currentCount == 0) {

                 return;

             }

             int from = 0;

             while (from < currentCount) {

                 if (e == current[from++]) {

                     break;

                 }

             }

             while (from < currentCount) {

                 current[from - 1] = current[from];

                 current[from] = null;

                 from++;

             }

             currentCount--;

         }

     }

     static final class TypeArray {

         private static final int CAPACITY_INCREMENT = 16;

         private int[] types;

         private int size;

         public TypeArray() {

         }

         public TypeArray(final TypeArray initialTypes) {

             setAll(initialTypes);

         }

         public void add(final int newType) {

             ensureCapacity(size + 1);

             types[size++] = newType;

         }

         public void addAll(final TypeArray newTypes) {

             addAll(newTypes.types, 0, newTypes.size);

         }

         public void addAll(final int[] newTypes) {

             addAll(newTypes, 0, newTypes.length);

         }

         public void addAll(final int[] newTypes,

             final int offset,

             final int count) {

             if (count > 0) {

                 ensureCapacity(size + count);

                 arraycopy(newTypes, offset, types, size, count);

                 size += count;

             }

         }

         public void set(final int index, final int newType) {

             types[index] = newType;

         }

         public void setAll(final TypeArray newTypes) {

             setAll(newTypes.types, 0, newTypes.size);

         }

         public void setAll(final int[] newTypes) {

             setAll(newTypes, 0, newTypes.length);

         }

         public void setAll(final int[] newTypes,

             final int offset,

             final int count) {

             if (count > 0) {

                 ensureCapacity(count);

                 arraycopy(newTypes, offset, types, 0, count);

                 size = count;

             } else {

                 clear();

             }

         }

         public void setSize(final int newSize) {

             if (size != newSize) {

                 ensureCapacity(newSize);

                 for (int i = size; i < newSize; ++i) {

                     types[i] = 0;

                 }

                 size = newSize;

             }

         }

         public void clear() {

             size = 0;

         }

         public int getSize() {

             return size;

         }

         public int get(final int index) {

             return types[index];

         }

         public static String typeString(final int type) {

             switch (type & 0xff) {

                 case ITEM_Bogus:

                     return "_top_";

                 case ITEM_Integer:

                     return "_int_";

                 case ITEM_Float:

                     return "_float_";

                 case ITEM_Double:

                     return "_double_";

                 case ITEM_Long:

                     return "_long_";

                 case ITEM_Null:

                     return "_null_";

                 case ITEM_InitObject: // UninitializedThis

                     return "_init_";

                 case ITEM_Object:

                     return "_object_";

                 case ITEM_NewObject: // Uninitialized

                     return "_new_";

                 default:

                     throw new IllegalArgumentException("Unknown type");

             }

         }

         @Override

         public String toString() {

             final StringBuilder sb = new StringBuilder("[");

             if (size > 0) {

                 sb.append(typeString(types[0]));

                 for (int i = 1; i < size; ++i) {

                     sb.append(", ");

                     sb.append(typeString(types[i]));

                 }

             }

             return sb.append(']').toString();

         }

         private void ensureCapacity(final int minCapacity) {

             if ((minCapacity == 0)

                 || (types != null) && (minCapacity <= types.length)) {

                 return;

             }

             final int newCapacity =

                 ((minCapacity + CAPACITY_INCREMENT - 1) / CAPACITY_INCREMENT)

                 * CAPACITY_INCREMENT;

             final int[] newTypes = new int[newCapacity];

             if (size > 0) {

                 arraycopy(types, 0, newTypes, 0, size);

             }

             types = newTypes;

         }