Java Code Examples for com.sun.org.apache.bcel.internal.util.ByteSequence#readUnsignedByte()

The following examples show how to use com.sun.org.apache.bcel.internal.util.ByteSequence#readUnsignedByte() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: LocalVariableInstruction.java    From Bytecoder with Apache License 2.0 6 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 * <pre>
 * (ILOAD &lt;= tag &lt;= ALOAD_3) || (ISTORE &lt;= tag &lt;= ASTORE_3)
 * </pre>
 */
@Override
protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
    if (wide) {
        n = bytes.readUnsignedShort();
        super.setLength(4);
    } else {
        final short _opcode = super.getOpcode();
        if (((_opcode >= Const.ILOAD) && (_opcode <= Const.ALOAD))
         || ((_opcode >= Const.ISTORE) && (_opcode <= Const.ASTORE))) {
            n = bytes.readUnsignedByte();
            super.setLength(2);
        } else if (_opcode <= Const.ALOAD_3) { // compact load instruction such as ILOAD_2
            n = (_opcode - Const.ILOAD_0) % 4;
            super.setLength(1);
        } else { // Assert ISTORE_0 <= tag <= ASTORE_3
            n = (_opcode - Const.ISTORE_0) % 4;
            super.setLength(1);
        }
    }
}
Example 2
Source File: LocalVariableInstruction.java    From hottub with GNU General Public License v2.0 6 votes vote down vote up 
/**
  * Read needed data (e.g. index) from file.
  * PRE: (ILOAD <= tag <= ALOAD_3) || (ISTORE <= tag <= ASTORE_3)
  */
 protected void initFromFile(ByteSequence bytes, boolean wide)
   throws IOException
 {
   if(wide) {
     n         = bytes.readUnsignedShort();
     length    = 4;
   } else if(((opcode >= Constants.ILOAD) &&
              (opcode <= Constants.ALOAD)) ||
             ((opcode >= Constants.ISTORE) &&
              (opcode <= Constants.ASTORE))) {
     n      = bytes.readUnsignedByte();
     length = 2;
   } else if(opcode <= Constants.ALOAD_3) { // compact load instruction such as ILOAD_2
     n      = (opcode - Constants.ILOAD_0) % 4;
     length = 1;
   } else { // Assert ISTORE_0 <= tag <= ASTORE_3
     n      = (opcode - Constants.ISTORE_0) % 4;
     length = 1;
   }
}
Example 3
Source File: LocalVariableInstruction.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 6 votes vote down vote up 
/**
  * Read needed data (e.g. index) from file.
  * PRE: (ILOAD <= tag <= ALOAD_3) || (ISTORE <= tag <= ASTORE_3)
  */
 protected void initFromFile(ByteSequence bytes, boolean wide)
   throws IOException
 {
   if(wide) {
     n         = bytes.readUnsignedShort();
     length    = 4;
   } else if(((opcode >= Constants.ILOAD) &&
              (opcode <= Constants.ALOAD)) ||
             ((opcode >= Constants.ISTORE) &&
              (opcode <= Constants.ASTORE))) {
     n      = bytes.readUnsignedByte();
     length = 2;
   } else if(opcode <= Constants.ALOAD_3) { // compact load instruction such as ILOAD_2
     n      = (opcode - Constants.ILOAD_0) % 4;
     length = 1;
   } else { // Assert ISTORE_0 <= tag <= ASTORE_3
     n      = (opcode - Constants.ISTORE_0) % 4;
     length = 1;
   }
}
Example 4
Source File: LDC.java    From openjdk-8-source with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide)
     throws IOException
{
  length = 2;
  index  = bytes.readUnsignedByte();
}
Example 5
Source File: INVOKEINTERFACE.java    From Bytecoder with Apache License 2.0 5 votes vote down vote up 
/**
 * Read needed data (i.e., index) from file.
 */
@Override
protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
    super.initFromFile(bytes, wide);
    super.setLength(5);
    nargs = bytes.readUnsignedByte();
    bytes.readByte(); // Skip 0 byte
}
Example 6
Source File: IINC.java    From openjdk-8 with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
{
  this.wide = wide;

  if(wide) {
    length = 6;
    n = bytes.readUnsignedShort();
    c = bytes.readShort();
  } else {
    length = 3;
    n = bytes.readUnsignedByte();
    c = bytes.readByte();
  }
}
Example 7
Source File: IINC.java    From jdk8u60 with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
{
  this.wide = wide;

  if(wide) {
    length = 6;
    n = bytes.readUnsignedShort();
    c = bytes.readShort();
  } else {
    length = 3;
    n = bytes.readUnsignedByte();
    c = bytes.readByte();
  }
}
Example 8
Source File: INVOKEINTERFACE.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (i.e., index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide)
     throws IOException
{
  super.initFromFile(bytes, wide);

  length = 5;
  nargs = bytes.readUnsignedByte();
  bytes.readByte(); // Skip 0 byte
}
Example 9
Source File: RET.java    From openjdk-jdk9 with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
{
  this.wide = wide;

  if(wide) {
    index  = bytes.readUnsignedShort();
    length = 4;
  } else {
    index = bytes.readUnsignedByte();
    length = 2;
  }
}
Example 10
Source File: IINC.java    From hottub with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
{
  this.wide = wide;

  if(wide) {
    length = 6;
    n = bytes.readUnsignedShort();
    c = bytes.readShort();
  } else {
    length = 3;
    n = bytes.readUnsignedByte();
    c = bytes.readByte();
  }
}
Example 11
Source File: IINC.java    From openjdk-jdk9 with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
{
  this.wide = wide;

  if(wide) {
    length = 6;
    n = bytes.readUnsignedShort();
    c = bytes.readShort();
  } else {
    length = 3;
    n = bytes.readUnsignedByte();
    c = bytes.readByte();
  }
}
Example 12
Source File: LDC.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide)
     throws IOException
{
  length = 2;
  index  = bytes.readUnsignedByte();
}
Example 13
Source File: IINC.java    From TencentKona-8 with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
{
  this.wide = wide;

  if(wide) {
    length = 6;
    n = bytes.readUnsignedShort();
    c = bytes.readShort();
  } else {
    length = 3;
    n = bytes.readUnsignedByte();
    c = bytes.readByte();
  }
}
Example 14
Source File: IINC.java    From openjdk-8-source with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
{
  this.wide = wide;

  if(wide) {
    length = 6;
    n = bytes.readUnsignedShort();
    c = bytes.readShort();
  } else {
    length = 3;
    n = bytes.readUnsignedByte();
    c = bytes.readByte();
  }
}
Example 15
Source File: RET.java    From openjdk-jdk8u with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
{
  this.wide = wide;

  if(wide) {
    index  = bytes.readUnsignedShort();
    length = 4;
  } else {
    index = bytes.readUnsignedByte();
    length = 2;
  }
}
Example 16
Source File: RET.java    From jdk1.8-source-analysis with Apache License 2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
{
  this.wide = wide;

  if(wide) {
    index  = bytes.readUnsignedShort();
    length = 4;
  } else {
    index = bytes.readUnsignedByte();
    length = 2;
  }
}
Example 17
Source File: IINC.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Read needed data (e.g. index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
{
  this.wide = wide;

  if(wide) {
    length = 6;
    n = bytes.readUnsignedShort();
    c = bytes.readShort();
  } else {
    length = 3;
    n = bytes.readUnsignedByte();
    c = bytes.readByte();
  }
}
Example 18
Source File: INVOKEINTERFACE.java    From jdk1.8-source-analysis with Apache License 2.0 5 votes vote down vote up 
/**
 * Read needed data (i.e., index) from file.
 */
protected void initFromFile(ByteSequence bytes, boolean wide)
     throws IOException
{
  super.initFromFile(bytes, wide);

  length = 5;
  nargs = bytes.readUnsignedByte();
  bytes.readByte(); // Skip 0 byte
}
Example 19
Source File: Instruction.java    From openjdk-jdk9 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Read an instruction from (byte code) input stream and return the
 * appropiate object.
 *
 * @param file file to read from
 * @return instruction object being read
 */
public static final Instruction readInstruction(ByteSequence bytes)
  throws IOException
{
  boolean     wide   = false;
  short       opcode = (short)bytes.readUnsignedByte();
  Instruction obj    = null;

  if(opcode == Constants.WIDE) { // Read next opcode after wide byte
    wide = true;
    opcode  = (short)bytes.readUnsignedByte();
  }

  if(InstructionConstants.INSTRUCTIONS[opcode] != null)
    return InstructionConstants.INSTRUCTIONS[opcode]; // Used predefined immutable object, if available

  /* Find appropiate class, instantiate an (empty) instruction object
   * and initialize it by hand.
   */
  Class clazz;

  try {
    clazz = Class.forName(className(opcode));
  } catch (ClassNotFoundException cnfe){
    // If a class by that name does not exist, the opcode is illegal.
    // Note that IMPDEP1, IMPDEP2, BREAKPOINT are also illegal in a sense.
    throw new ClassGenException("Illegal opcode detected.");
  }

  try {
    obj = (Instruction)clazz.newInstance();

    if(wide && !((obj instanceof LocalVariableInstruction) ||
                 (obj instanceof IINC) ||
                 (obj instanceof RET)))
      throw new Exception("Illegal opcode after wide: " + opcode);

    obj.setOpcode(opcode);
    obj.initFromFile(bytes, wide); // Do further initializations, if any
    // Byte code offset set in InstructionList
  } catch(Exception e) { throw new ClassGenException(e.toString()); }

  return obj;
}
Example 20
Source File: Instruction.java    From jdk1.8-source-analysis with Apache License 2.0 4 votes vote down vote up 
/**
 * Read an instruction from (byte code) input stream and return the
 * appropiate object.
 *
 * @param file file to read from
 * @return instruction object being read
 */
public static final Instruction readInstruction(ByteSequence bytes)
  throws IOException
{
  boolean     wide   = false;
  short       opcode = (short)bytes.readUnsignedByte();
  Instruction obj    = null;

  if(opcode == Constants.WIDE) { // Read next opcode after wide byte
    wide = true;
    opcode  = (short)bytes.readUnsignedByte();
  }

  if(InstructionConstants.INSTRUCTIONS[opcode] != null)
    return InstructionConstants.INSTRUCTIONS[opcode]; // Used predefined immutable object, if available

  /* Find appropiate class, instantiate an (empty) instruction object
   * and initialize it by hand.
   */
  Class clazz;

  try {
    clazz = Class.forName(className(opcode));
  } catch (ClassNotFoundException cnfe){
    // If a class by that name does not exist, the opcode is illegal.
    // Note that IMPDEP1, IMPDEP2, BREAKPOINT are also illegal in a sense.
    throw new ClassGenException("Illegal opcode detected.");
  }

  try {
    obj = (Instruction)clazz.newInstance();

    if(wide && !((obj instanceof LocalVariableInstruction) ||
                 (obj instanceof IINC) ||
                 (obj instanceof RET)))
      throw new Exception("Illegal opcode after wide: " + opcode);

    obj.setOpcode(opcode);
    obj.initFromFile(bytes, wide); // Do further initializations, if any
    // Byte code offset set in InstructionList
  } catch(Exception e) { throw new ClassGenException(e.toString()); }

  return obj;
}