proguard.classfile.instruction
Class VariableInstruction

java.lang.Object
  proguard.classfile.instruction.Instruction
      proguard.classfile.instruction.VariableInstruction

public class VariableInstruction

extends Instruction

This Instruction represents an instruction that refers to a variable on the local variable stack.

Field Summary

int	constant
int	variableIndex
boolean	wide

Fields inherited from class proguard.classfile.instruction.Instruction

opcode

Constructor Summary

VariableInstruction()
Creates an uninitialized VariableInstruction.

VariableInstruction(byte opcode, int variableIndex)

VariableInstruction(byte opcode, int variableIndex, int constant)

Method Summary

void	accept(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, InstructionVisitor instructionVisitor) Accepts the given visitor.
VariableInstruction	copy(VariableInstruction variableInstruction) Copies the given instruction into this instruction.
boolean	isLoad() Returns whether this instruction loads the value of a variable onto the stack, or if it stores one.
protected boolean	isWide() Returns whether the instruction is wide, i.e.
int	length(int offset) Returns the length in bytes of the instruction.
protected void	readInfo(byte[] code, int offset) Reads the data following the instruction opcode.
Instruction	shrink() Shrinks this instruction to its shortest possible form.
String	toString()
String	toString(int offset) Returns a description of the instruction, at the given offset.
protected void	writeInfo(byte[] code, int offset) Writes data following the instruction opcode.

Methods inherited from class proguard.classfile.instruction.Instruction

getName, isCategory2, readByte, readInt, readShort, readSignedByte, readSignedShort, readSignedValue, readValue, stackPopCount, stackPushCount, write, writeByte, writeInt, writeShort, writeValue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

wide

public boolean wide

variableIndex

public int variableIndex

constant

public int constant

Constructor Detail

VariableInstruction

public VariableInstruction()

Creates an uninitialized VariableInstruction.

VariableInstruction

public VariableInstruction(byte opcode,
                           int variableIndex)

VariableInstruction

public VariableInstruction(byte opcode,
                           int variableIndex,
                           int constant)

Method Detail

copy

public VariableInstruction copy(VariableInstruction variableInstruction)

Copies the given instruction into this instruction.

Parameters:

variableInstruction - the instruction to be copied.

Returns:

this instruction.

isLoad

public boolean isLoad()

Returns whether this instruction loads the value of a variable onto the stack, or if it stores one.

shrink

public Instruction shrink()

Description copied from class: Instruction

Shrinks this instruction to its shortest possible form.

Specified by:

shrink in class Instruction

Returns:

this instruction.

isWide

protected boolean isWide()

Description copied from class: Instruction

Returns whether the instruction is wide, i.e. preceded by a wide opcode. With the current specifications, only variable instructions can be wide.

Overrides:

isWide in class Instruction

readInfo

protected void readInfo(byte[] code,
                        int offset)

Description copied from class: Instruction

Reads the data following the instruction opcode.

Specified by:

readInfo in class Instruction

writeInfo

protected void writeInfo(byte[] code,
                         int offset)

Description copied from class: Instruction

Writes data following the instruction opcode.

Specified by:

writeInfo in class Instruction

length

public int length(int offset)

Description copied from class: Instruction

Returns the length in bytes of the instruction.

Specified by:

length in class Instruction

accept

public void accept(ClassFile classFile,
                   MethodInfo methodInfo,
                   CodeAttrInfo codeAttrInfo,
                   int offset,
                   InstructionVisitor instructionVisitor)

Description copied from class: Instruction

Accepts the given visitor.

Specified by:

accept in class Instruction

toString

public String toString(int offset)

Description copied from class: Instruction

Returns a description of the instruction, at the given offset.

Specified by:

toString in class Instruction

toString

public String toString()