Example #1
0
 /**
  * Disassemble a stream of byte codes and return the string representation.
  *
  * @param stream data input stream
  * @return String representation of byte code
  */
 private final String codeToHTML(ByteSequence bytes, int method_number) throws IOException {
   short opcode = (short) bytes.readUnsignedByte();
   StringBuilder buf;
   String name, signature;
   int default_offset = 0, low, high;
   int index, class_index, vindex, constant;
   int[] jump_table;
   int no_pad_bytes = 0, offset;
   buf = new StringBuilder(256);
   buf.append("<TT>").append(OPCODE_NAMES[opcode]).append("</TT></TD><TD>");
   /* Special case: Skip (0-3) padding bytes, i.e., the
    * following bytes are 4-byte-aligned
    */
   if ((opcode == TABLESWITCH) || (opcode == LOOKUPSWITCH)) {
     int remainder = bytes.getIndex() % 4;
     no_pad_bytes = (remainder == 0) ? 0 : 4 - remainder;
     for (int i = 0; i < no_pad_bytes; i++) {
       bytes.readByte();
     }
     // Both cases have a field default_offset in common
     default_offset = bytes.readInt();
   }
   switch (opcode) {
     case TABLESWITCH:
       low = bytes.readInt();
       high = bytes.readInt();
       offset = bytes.getIndex() - 12 - no_pad_bytes - 1;
       default_offset += offset;
       buf.append("<TABLE BORDER=1><TR>");
       // Print switch indices in first row (and default)
       jump_table = new int[high - low + 1];
       for (int i = 0; i < jump_table.length; i++) {
         jump_table[i] = offset + bytes.readInt();
         buf.append("<TH>").append(low + i).append("</TH>");
       }
       buf.append("<TH>default</TH></TR>\n<TR>");
       // Print target and default indices in second row
       for (int i = 0; i < jump_table.length; i++) {
         buf.append("<TD><A HREF=\"#code")
             .append(method_number)
             .append("@")
             .append(jump_table[i])
             .append("\">")
             .append(jump_table[i])
             .append("</A></TD>");
       }
       buf.append("<TD><A HREF=\"#code")
           .append(method_number)
           .append("@")
           .append(default_offset)
           .append("\">")
           .append(default_offset)
           .append("</A></TD></TR>\n</TABLE>\n");
       break;
       /* Lookup switch has variable length arguments.
        */
     case LOOKUPSWITCH:
       int npairs = bytes.readInt();
       offset = bytes.getIndex() - 8 - no_pad_bytes - 1;
       jump_table = new int[npairs];
       default_offset += offset;
       buf.append("<TABLE BORDER=1><TR>");
       // Print switch indices in first row (and default)
       for (int i = 0; i < npairs; i++) {
         int match = bytes.readInt();
         jump_table[i] = offset + bytes.readInt();
         buf.append("<TH>").append(match).append("</TH>");
       }
       buf.append("<TH>default</TH></TR>\n<TR>");
       // Print target and default indices in second row
       for (int i = 0; i < npairs; i++) {
         buf.append("<TD><A HREF=\"#code")
             .append(method_number)
             .append("@")
             .append(jump_table[i])
             .append("\">")
             .append(jump_table[i])
             .append("</A></TD>");
       }
       buf.append("<TD><A HREF=\"#code")
           .append(method_number)
           .append("@")
           .append(default_offset)
           .append("\">")
           .append(default_offset)
           .append("</A></TD></TR>\n</TABLE>\n");
       break;
       /* Two address bytes + offset from start of byte stream form the
        * jump target.
        */
     case GOTO:
     case IFEQ:
     case IFGE:
     case IFGT:
     case IFLE:
     case IFLT:
     case IFNE:
     case IFNONNULL:
     case IFNULL:
     case IF_ACMPEQ:
     case IF_ACMPNE:
     case IF_ICMPEQ:
     case IF_ICMPGE:
     case IF_ICMPGT:
     case IF_ICMPLE:
     case IF_ICMPLT:
     case IF_ICMPNE:
     case JSR:
       index = (int) (bytes.getIndex() + bytes.readShort() - 1);
       buf.append("<A HREF=\"#code")
           .append(method_number)
           .append("@")
           .append(index)
           .append("\">")
           .append(index)
           .append("</A>");
       break;
       /* Same for 32-bit wide jumps
        */
     case GOTO_W:
     case JSR_W:
       int windex = bytes.getIndex() + bytes.readInt() - 1;
       buf.append("<A HREF=\"#code")
           .append(method_number)
           .append("@")
           .append(windex)
           .append("\">")
           .append(windex)
           .append("</A>");
       break;
       /* Index byte references local variable (register)
        */
     case ALOAD:
     case ASTORE:
     case DLOAD:
     case DSTORE:
     case FLOAD:
     case FSTORE:
     case ILOAD:
     case ISTORE:
     case LLOAD:
     case LSTORE:
     case RET:
       if (wide) {
         vindex = bytes.readShort();
         wide = false; // Clear flag
       } else {
         vindex = bytes.readUnsignedByte();
       }
       buf.append("%").append(vindex);
       break;
       /*
        * Remember wide byte which is used to form a 16-bit address in the
        * following instruction. Relies on that the method is called again with
        * the following opcode.
        */
     case WIDE:
       wide = true;
       buf.append("(wide)");
       break;
       /* Array of basic type.
        */
     case NEWARRAY:
       buf.append("<FONT COLOR=\"#00FF00\">")
           .append(TYPE_NAMES[bytes.readByte()])
           .append("</FONT>");
       break;
       /* Access object/class fields.
        */
     case GETFIELD:
     case GETSTATIC:
     case PUTFIELD:
     case PUTSTATIC:
       index = bytes.readShort();
       ConstantFieldref c1 =
           (ConstantFieldref) constant_pool.getConstant(index, CONSTANT_Fieldref);
       class_index = c1.getClassIndex();
       name = constant_pool.getConstantString(class_index, CONSTANT_Class);
       name = Utility.compactClassName(name, false);
       index = c1.getNameAndTypeIndex();
       String field_name = constant_pool.constantToString(index, CONSTANT_NameAndType);
       if (name.equals(class_name)) { // Local field
         buf.append("<A HREF=\"")
             .append(class_name)
             .append("_methods.html#field")
             .append(field_name)
             .append("\" TARGET=Methods>")
             .append(field_name)
             .append("</A>\n");
       } else {
         buf.append(constant_html.referenceConstant(class_index)).append(".").append(field_name);
       }
       break;
       /* Operands are references to classes in constant pool
        */
     case CHECKCAST:
     case INSTANCEOF:
     case NEW:
       index = bytes.readShort();
       buf.append(constant_html.referenceConstant(index));
       break;
       /* Operands are references to methods in constant pool
        */
     case INVOKESPECIAL:
     case INVOKESTATIC:
     case INVOKEVIRTUAL:
     case INVOKEINTERFACE:
       int m_index = bytes.readShort();
       String str;
       if (opcode == INVOKEINTERFACE) { // Special treatment needed
         int nargs = bytes.readUnsignedByte(); // Redundant
         int reserved = bytes.readUnsignedByte(); // Reserved
         ConstantInterfaceMethodref c =
             (ConstantInterfaceMethodref)
                 constant_pool.getConstant(m_index, CONSTANT_InterfaceMethodref);
         class_index = c.getClassIndex();
         str = constant_pool.constantToString(c);
         index = c.getNameAndTypeIndex();
       } else {
         ConstantMethodref c =
             (ConstantMethodref) constant_pool.getConstant(m_index, CONSTANT_Methodref);
         class_index = c.getClassIndex();
         str = constant_pool.constantToString(c);
         index = c.getNameAndTypeIndex();
       }
       name = Class2HTML.referenceClass(class_index);
       str =
           Class2HTML.toHTML(
               constant_pool.constantToString(
                   constant_pool.getConstant(index, CONSTANT_NameAndType)));
       // Get signature, i.e., types
       ConstantNameAndType c2 =
           (ConstantNameAndType) constant_pool.getConstant(index, CONSTANT_NameAndType);
       signature = constant_pool.constantToString(c2.getSignatureIndex(), CONSTANT_Utf8);
       String[] args = Utility.methodSignatureArgumentTypes(signature, false);
       String type = Utility.methodSignatureReturnType(signature, false);
       buf.append(name)
           .append(".<A HREF=\"")
           .append(class_name)
           .append("_cp.html#cp")
           .append(m_index)
           .append("\" TARGET=ConstantPool>")
           .append(str)
           .append("</A>")
           .append("(");
       // List arguments
       for (int i = 0; i < args.length; i++) {
         buf.append(Class2HTML.referenceType(args[i]));
         if (i < args.length - 1) {
           buf.append(", ");
         }
       }
       // Attach return type
       buf.append("):").append(Class2HTML.referenceType(type));
       break;
       /* Operands are references to items in constant pool
        */
     case LDC_W:
     case LDC2_W:
       index = bytes.readShort();
       buf.append("<A HREF=\"")
           .append(class_name)
           .append("_cp.html#cp")
           .append(index)
           .append("\" TARGET=\"ConstantPool\">")
           .append(
               Class2HTML.toHTML(
                   constant_pool.constantToString(
                       index, constant_pool.getConstant(index).getTag())))
           .append("</a>");
       break;
     case LDC:
       index = bytes.readUnsignedByte();
       buf.append("<A HREF=\"")
           .append(class_name)
           .append("_cp.html#cp")
           .append(index)
           .append("\" TARGET=\"ConstantPool\">")
           .append(
               Class2HTML.toHTML(
                   constant_pool.constantToString(
                       index, constant_pool.getConstant(index).getTag())))
           .append("</a>");
       break;
       /* Array of references.
        */
     case ANEWARRAY:
       index = bytes.readShort();
       buf.append(constant_html.referenceConstant(index));
       break;
       /* Multidimensional array of references.
        */
     case MULTIANEWARRAY:
       index = bytes.readShort();
       int dimensions = bytes.readByte();
       buf.append(constant_html.referenceConstant(index))
           .append(":")
           .append(dimensions)
           .append("-dimensional");
       break;
       /* Increment local variable.
        */
     case IINC:
       if (wide) {
         vindex = bytes.readShort();
         constant = bytes.readShort();
         wide = false;
       } else {
         vindex = bytes.readUnsignedByte();
         constant = bytes.readByte();
       }
       buf.append("%").append(vindex).append(" ").append(constant);
       break;
     default:
       if (NO_OF_OPERANDS[opcode] > 0) {
         for (int i = 0; i < TYPE_OF_OPERANDS[opcode].length; i++) {
           switch (TYPE_OF_OPERANDS[opcode][i]) {
             case T_BYTE:
               buf.append(bytes.readUnsignedByte());
               break;
             case T_SHORT: // Either branch or index
               buf.append(bytes.readShort());
               break;
             case T_INT:
               buf.append(bytes.readInt());
               break;
             default: // Never reached
               System.err.println("Unreachable default case reached!");
               System.exit(-1);
           }
           buf.append("&nbsp;");
         }
       }
   }
   buf.append("</TD>");
   return buf.toString();
 }
Example #2
0
 /** Write a single method with the byte code associated with it. */
 private void writeMethod(Method method, int method_number) throws IOException {
   // Get raw signature
   String signature = method.getSignature();
   // Get array of strings containing the argument types
   String[] args = Utility.methodSignatureArgumentTypes(signature, false);
   // Get return type string
   String type = Utility.methodSignatureReturnType(signature, false);
   // Get method name
   String name = method.getName();
   String html_name = Class2HTML.toHTML(name);
   // Get method's access flags
   String access = Utility.accessToString(method.getAccessFlags());
   access = Utility.replace(access, " ", "&nbsp;");
   // Get the method's attributes, the Code Attribute in particular
   Attribute[] attributes = method.getAttributes();
   file.print(
       "<P><B><FONT COLOR=\"#FF0000\">"
           + access
           + "</FONT>&nbsp;"
           + "<A NAME=method"
           + method_number
           + ">"
           + Class2HTML.referenceType(type)
           + "</A>&nbsp<A HREF=\""
           + class_name
           + "_methods.html#method"
           + method_number
           + "\" TARGET=Methods>"
           + html_name
           + "</A>(");
   for (int i = 0; i < args.length; i++) {
     file.print(Class2HTML.referenceType(args[i]));
     if (i < args.length - 1) {
       file.print(",&nbsp;");
     }
   }
   file.println(")</B></P>");
   Code c = null;
   byte[] code = null;
   if (attributes.length > 0) {
     file.print("<H4>Attributes</H4><UL>\n");
     for (int i = 0; i < attributes.length; i++) {
       byte tag = attributes[i].getTag();
       if (tag != ATTR_UNKNOWN) {
         file.print(
             "<LI><A HREF=\""
                 + class_name
                 + "_attributes.html#method"
                 + method_number
                 + "@"
                 + i
                 + "\" TARGET=Attributes>"
                 + ATTRIBUTE_NAMES[tag]
                 + "</A></LI>\n");
       } else {
         file.print("<LI>" + attributes[i] + "</LI>");
       }
       if (tag == ATTR_CODE) {
         c = (Code) attributes[i];
         Attribute[] attributes2 = c.getAttributes();
         code = c.getCode();
         file.print("<UL>");
         for (int j = 0; j < attributes2.length; j++) {
           tag = attributes2[j].getTag();
           file.print(
               "<LI><A HREF=\""
                   + class_name
                   + "_attributes.html#"
                   + "method"
                   + method_number
                   + "@"
                   + i
                   + "@"
                   + j
                   + "\" TARGET=Attributes>"
                   + ATTRIBUTE_NAMES[tag]
                   + "</A></LI>\n");
         }
         file.print("</UL>");
       }
     }
     file.println("</UL>");
   }
   if (code != null) { // No code, an abstract method, e.g.
     // System.out.println(name + "\n" + Utility.codeToString(code, constant_pool, 0, -1));
     // Print the byte code
     ByteSequence stream = new ByteSequence(code);
     stream.mark(stream.available());
     findGotos(stream, method, c);
     stream.reset();
     file.println(
         "<TABLE BORDER=0><TR><TH ALIGN=LEFT>Byte<BR>offset</TH>"
             + "<TH ALIGN=LEFT>Instruction</TH><TH ALIGN=LEFT>Argument</TH>");
     for (int i = 0; stream.available() > 0; i++) {
       int offset = stream.getIndex();
       String str = codeToHTML(stream, method_number);
       String anchor = "";
       /* Set an anchor mark if this line is targetted by a goto, jsr, etc.
        * Defining an anchor for every line is very inefficient!
        */
       if (goto_set.get(offset)) {
         anchor = "<A NAME=code" + method_number + "@" + offset + "></A>";
       }
       String anchor2;
       if (stream.getIndex() == code.length) {
         anchor2 = "<A NAME=code" + method_number + "@" + code.length + ">" + offset + "</A>";
       } else {
         anchor2 = "" + offset;
       }
       file.println("<TR VALIGN=TOP><TD>" + anchor2 + "</TD><TD>" + anchor + str + "</TR>");
     }
     // Mark last line, may be targetted from Attributes window
     file.println("<TR><TD> </A></TD></TR>");
     file.println("</TABLE>");
   }
 }