org.ow2.asmdex.instruction
Class InstructionFormat22B

java.lang.Object
  extended by org.ow2.asmdex.instruction.Instruction
      extended by org.ow2.asmdex.instruction.InstructionFormat22B
All Implemented Interfaces:
ILiteralInstruction, ITwoRegistersInstruction

public class InstructionFormat22B
extends Instruction
implements ITwoRegistersInstruction, ILiteralInstruction

Encodes and decodes an instruction built with the Dalvik format 22B.

Author:
Julien Névo

Field Summary
 
Fields inherited from class org.ow2.asmdex.instruction.Instruction
lineNumber, opcodeByte, opcodeHighOrderByte
 
Constructor Summary
InstructionFormat22B(int opcode, int registerA, int registerB, int value)
          Constructor of the Instruction by providing all the elements it's composed of.
 
Method Summary
static int getEncodedRegisterBAndLiteralC(IDalvikValueReader reader)
          Returns the RegisterB and LiteralC encoded as an int, from where the Reader points.
 int getLiteral()
          The value of the litteral.
static int getLiteralCFromEncodedRegisterBAndLiteralC(int encodedRegisterBAndC)
          Returns the LiteralC encoded inside the given value, that should contained both RegisterB and LiteralC from the getEncodedRegisterBAndLiteralC method.
 int getRegisterA()
          Gets the index of first register
static int getRegisterA(int opcode)
          Returns the RegisterA encoded in the given 16-bit opcode.
 int getRegisterB()
          Gets the index of second register
static int getRegisterBFromEncodedRegisterBAndC(int encodedRegisterBAndLiteralC)
          Returns the RegisterB encoded inside the given value, that should contained both RegisterB and LiteralC from the getEncodedRegisterBAndLiteralC method.
 int getSize()
          Returns the size of the instruction in bytes.
static void skip(IDalvikValueReader reader)
          Skips the data of this Instruction.
 void write(ByteVector out, ConstantPool constantPool)
          Encodes the instruction, in the Dalvik format, to an output buffer.
 
Methods inherited from class org.ow2.asmdex.instruction.Instruction
getInstructionSizeInByte, getLineNumber, getOpcodeByte, getOpcodeHighOrderByte, setLineNumber, test4BitsLimit, test4BitsLimit
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

InstructionFormat22B

public InstructionFormat22B(int opcode,
                            int registerA,
                            int registerB,
                            int value)
Constructor of the Instruction by providing all the elements it's composed of.

Parameters:
opcode - 8 or 16 bits opcode.
registerA - the first register to store.
registerB - the second register to store.
value - the literal to store.
Method Detail

getRegisterA

public int getRegisterA()
Description copied from interface: ITwoRegistersInstruction
Gets the index of first register

Specified by:
getRegisterA in interface ITwoRegistersInstruction
Returns:
index

getRegisterB

public int getRegisterB()
Description copied from interface: ITwoRegistersInstruction
Gets the index of second register

Specified by:
getRegisterB in interface ITwoRegistersInstruction
Returns:
index

getLiteral

public int getLiteral()
Description copied from interface: ILiteralInstruction
The value of the litteral.

Specified by:
getLiteral in interface ILiteralInstruction
Returns:
as an integer (one word).

getRegisterA

public static int getRegisterA(int opcode)
Returns the RegisterA encoded in the given 16-bit opcode.

Returns:
the RegisterA.

getEncodedRegisterBAndLiteralC

public static int getEncodedRegisterBAndLiteralC(IDalvikValueReader reader)
Returns the RegisterB and LiteralC encoded as an int, from where the Reader points. It must be performed only once after having read the opcode.. To decode the returned int, use getRegisterBFromEncodedRegisterBAndLiteralC and getLiteralCFromEncodedRegisterBAndLiteralC.

Parameters:
reader - reader pointing after the 16-bit opcode.
Returns:
the RegisterB and LiteralC, encoded as one single int.

getRegisterBFromEncodedRegisterBAndC

public static int getRegisterBFromEncodedRegisterBAndC(int encodedRegisterBAndLiteralC)
Returns the RegisterB encoded inside the given value, that should contained both RegisterB and LiteralC from the getEncodedRegisterBAndLiteralC method.

Parameters:
encodedRegisterBAndLiteralC - the RegisterB and C encoded as an int.
Returns:
the RegisterB.

getLiteralCFromEncodedRegisterBAndLiteralC

public static int getLiteralCFromEncodedRegisterBAndLiteralC(int encodedRegisterBAndC)
Returns the LiteralC encoded inside the given value, that should contained both RegisterB and LiteralC from the getEncodedRegisterBAndLiteralC method.

Parameters:
encodedRegisterBAndC - the RegisterB and LiteralC encoded as an int.
Returns:
the LiteralC.

skip

public static void skip(IDalvikValueReader reader)
Skips the data of this Instruction.

Parameters:
reader - reader on the Instruction to parse, pointing after the 16-bit opcode.

getSize

public int getSize()
Description copied from class: Instruction
Returns the size of the instruction in bytes.

Specified by:
getSize in class Instruction
Returns:
the size of the instruction in bytes.

write

public void write(ByteVector out,
                  ConstantPool constantPool)
Description copied from class: Instruction
Encodes the instruction, in the Dalvik format, to an output buffer.

Specified by:
write in class Instruction
Parameters:
out - output buffer.
constantPool - the constantPool.