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    1   /*
    2    * Copyright  2000-2004 The Apache Software Foundation
    3    *
    4    *  Licensed under the Apache License, Version 2.0 (the "License");
    5    *  you may not use this file except in compliance with the License.
    6    *  You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   *  Unless required by applicable law or agreed to in writing, software
    11   *  distributed under the License is distributed on an "AS IS" BASIS,
    12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   *  See the License for the specific language governing permissions and
    14   *  limitations under the License.
    15   *
    16   */
    17  package org.apache.bcel.util;
    18
    19  import java.io.FileOutputStream;
    20  import java.io.IOException;
    21  import java.io.PrintWriter;
    22  import org.apache.bcel.classfile.Attribute;
    23  import org.apache.bcel.classfile.Code;
    24  import org.apache.bcel.classfile.CodeException;
    25  import org.apache.bcel.classfile.ConstantPool;
    26  import org.apache.bcel.classfile.ConstantUtf8;
    27  import org.apache.bcel.classfile.ConstantValue;
    28  import org.apache.bcel.classfile.ExceptionTable;
    29  import org.apache.bcel.classfile.InnerClass;
    30  import org.apache.bcel.classfile.InnerClasses;
    31  import org.apache.bcel.classfile.LineNumber;
    32  import org.apache.bcel.classfile.LineNumberTable;
    33  import org.apache.bcel.classfile.LocalVariable;
    34  import org.apache.bcel.classfile.LocalVariableTable;
    35  import org.apache.bcel.classfile.SourceFile;
    36  import org.apache.bcel.classfile.Utility;
    37
    38  /***
    39   * Convert found attributes into HTML file.
    40   *
    41   * @version $Id: AttributeHTML.java 386056 2006-03-15 11:31:56Z tcurdt $
    42   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
    43   *
    44   */
    45  final class AttributeHTML implements org.apache.bcel.Constants {
    46
    47      private String class_name; // name of current class
    48      private PrintWriter file; // file to write to
    49      private int attr_count = 0;
    50      private ConstantHTML constant_html;
    51      private ConstantPool constant_pool;
    52
    53
    54      AttributeHTML(String dir, String class_name, ConstantPool constant_pool,
    55              ConstantHTML constant_html) throws IOException {
    56          this.class_name = class_name;
    57          this.constant_pool = constant_pool;
    58          this.constant_html = constant_html;
    59          file = new PrintWriter(new FileOutputStream(dir + class_name + "_attributes.html"));
    60          file.println("<HTML><BODY BGCOLOR=\"#C0C0C0\"><TABLE BORDER=0>");
    61      }
    62
    63
    64      private final String codeLink( int link, int method_number ) {
    65          return "<A HREF=\"" + class_name + "_code.html#code" + method_number + "@" + link
    66                  + "\" TARGET=Code>" + link + "</A>";
    67      }
    68
    69
    70      final void close() {
    71          file.println("</TABLE></BODY></HTML>");
    72          file.close();
    73      }
    74
    75
    76      final void writeAttribute( Attribute attribute, String anchor ) throws IOException {
    77          writeAttribute(attribute, anchor, 0);
    78      }
    79
    80
    81      final void writeAttribute( Attribute attribute, String anchor, int method_number )
    82              throws IOException {
    83          byte tag = attribute.getTag();
    84          int index;
    85          if (tag == ATTR_UNKNOWN) {
    86              return;
    87          }
    88          attr_count++; // Increment number of attributes found so far
    89          if (attr_count % 2 == 0) {
    90              file.print("<TR BGCOLOR=\"#C0C0C0\"><TD>");
    91          } else {
    92              file.print("<TR BGCOLOR=\"#A0A0A0\"><TD>");
    93          }
    94          file.println("<H4><A NAME=\"" + anchor + "\">" + attr_count + " " + ATTRIBUTE_NAMES[tag]
    95                  + "</A></H4>");
    96          /* Handle different attributes
    97           */
    98          switch (tag) {
    99              case ATTR_CODE:
    100                 Code c = (Code) attribute;
    101                 // Some directly printable values
    102                 file.print("<UL><LI>Maximum stack size = " + c.getMaxStack()
    103                         + "</LI>\n<LI>Number of local variables = " + c.getMaxLocals()
    104                         + "</LI>\n<LI><A HREF=\"" + class_name + "_code.html#method"
    105                         + method_number + "\" TARGET=Code>Byte code</A></LI></UL>\n");
    106                 // Get handled exceptions and list them
    107                 CodeException[] ce = c.getExceptionTable();
    108                 int len = ce.length;
    109                 if (len > 0) {
    110                     file.print("<P><B>Exceptions handled</B><UL>");
    111                     for (int i = 0; i < len; i++) {
    112                         int catch_type = ce[i].getCatchType(); // Index in constant pool
    113                         file.print("<LI>");
    114                         if (catch_type != 0) {
    115                             file.print(constant_html.referenceConstant(catch_type)); // Create Link to _cp.html
    116                         } else {
    117                             file.print("Any Exception");
    118                         }
    119                         file.print("<BR>(Ranging from lines "
    120                                 + codeLink(ce[i].getStartPC(), method_number) + " to "
    121                                 + codeLink(ce[i].getEndPC(), method_number) + ", handled at line "
    122                                 + codeLink(ce[i].getHandlerPC(), method_number) + ")</LI>");
    123                     }
    124                     file.print("</UL>");
    125                 }
    126                 break;
    127             case ATTR_CONSTANT_VALUE:
    128                 index = ((ConstantValue) attribute).getConstantValueIndex();
    129                 // Reference _cp.html
    130                 file.print("<UL><LI><A HREF=\"" + class_name + "_cp.html#cp" + index
    131                         + "\" TARGET=\"ConstantPool\">Constant value index(" + index
    132                         + ")</A></UL>\n");
    133                 break;
    134             case ATTR_SOURCE_FILE:
    135                 index = ((SourceFile) attribute).getSourceFileIndex();
    136                 // Reference _cp.html
    137                 file.print("<UL><LI><A HREF=\"" + class_name + "_cp.html#cp" + index
    138                         + "\" TARGET=\"ConstantPool\">Source file index(" + index + ")</A></UL>\n");
    139                 break;
    140             case ATTR_EXCEPTIONS:
    141                 // List thrown exceptions
    142                 int[] indices = ((ExceptionTable) attribute).getExceptionIndexTable();
    143                 file.print("<UL>");
    144                 for (int i = 0; i < indices.length; i++) {
    145                     file.print("<LI><A HREF=\"" + class_name + "_cp.html#cp" + indices[i]
    146                             + "\" TARGET=\"ConstantPool\">Exception class index(" + indices[i]
    147                             + ")</A>\n");
    148                 }
    149                 file.print("</UL>\n");
    150                 break;
    151             case ATTR_LINE_NUMBER_TABLE:
    152                 LineNumber[] line_numbers = ((LineNumberTable) attribute).getLineNumberTable();
    153                 // List line number pairs
    154                 file.print("<P>");
    155                 for (int i = 0; i < line_numbers.length; i++) {
    156                     file.print("(" + line_numbers[i].getStartPC() + ",&nbsp;"
    157                             + line_numbers[i].getLineNumber() + ")");
    158                     if (i < line_numbers.length - 1) {
    159                         file.print(", "); // breakable
    160                     }
    161                 }
    162                 break;
    163             case ATTR_LOCAL_VARIABLE_TABLE:
    164                 LocalVariable[] vars = ((LocalVariableTable) attribute).getLocalVariableTable();
    165                 // List name, range and type
    166                 file.print("<UL>");
    167                 for (int i = 0; i < vars.length; i++) {
    168                     index = vars[i].getSignatureIndex();
    169                     String signature = ((ConstantUtf8) constant_pool.getConstant(index,
    170                             CONSTANT_Utf8)).getBytes();
    171                     signature = Utility.signatureToString(signature, false);
    172                     int start = vars[i].getStartPC();
    173                     int end = (start + vars[i].getLength());
    174                     file.println("<LI>" + Class2HTML.referenceType(signature) + "&nbsp;<B>"
    175                             + vars[i].getName() + "</B> in slot %" + vars[i].getIndex()
    176                             + "<BR>Valid from lines " + "<A HREF=\"" + class_name
    177                             + "_code.html#code" + method_number + "@" + start + "\" TARGET=Code>"
    178                             + start + "</A> to " + "<A HREF=\"" + class_name + "_code.html#code"
    179                             + method_number + "@" + end + "\" TARGET=Code>" + end + "</A></LI>");
    180                 }
    181                 file.print("</UL>\n");
    182                 break;
    183             case ATTR_INNER_CLASSES:
    184                 InnerClass[] classes = ((InnerClasses) attribute).getInnerClasses();
    185                 // List inner classes
    186                 file.print("<UL>");
    187                 for (int i = 0; i < classes.length; i++) {
    188                     String name, access;
    189                     index = classes[i].getInnerNameIndex();
    190                     if (index > 0) {
    191                         name = ((ConstantUtf8) constant_pool.getConstant(index, CONSTANT_Utf8))
    192                                 .getBytes();
    193                     } else {
    194                         name = "&lt;anonymous&gt;";
    195                     }
    196                     access = Utility.accessToString(classes[i].getInnerAccessFlags());
    197                     file.print("<LI><FONT COLOR=\"#FF0000\">" + access + "</FONT> "
    198                             + constant_html.referenceConstant(classes[i].getInnerClassIndex())
    199                             + " in&nbsp;class "
    200                             + constant_html.referenceConstant(classes[i].getOuterClassIndex())
    201                             + " named " + name + "</LI>\n");
    202                 }
    203                 file.print("</UL>\n");
    204                 break;
    205             default: // Such as Unknown attribute or Deprecated
    206                 file.print("<P>" + attribute.toString());
    207         }
    208         file.println("</TD></TR>");
    209         file.flush();
    210     }
    211 }