Package org.apache.commons.compress.harmony.unpack200.bytecode.forms

Class ByteCodeForm

java.lang.Object

org.apache.commons.compress.harmony.unpack200.bytecode.forms.ByteCodeForm

Direct Known Subclasses:

ByteForm, IincForm, LabelForm, LocalForm, NoArgumentForm, ReferenceForm, ShortForm, VariableInstructionForm

public abstract class ByteCodeForm
extends java.lang.Object

Abstract byte code form.

Field Summary

Fields

Modifier and Type	Field	Description
protected static ByteCodeForm[]	byteCodeArray
protected static java.util.Map<java.lang.String,ByteCodeForm>	byteCodesByName
protected static boolean	WIDENED

Constructor Summary

Constructors

Constructor	Description
ByteCodeForm(int opcode, java.lang.String name)	Constructs a new instance with the specified opcode and name.
ByteCodeForm(int opcode, java.lang.String name, int[] rewrite)	Constructs a new instance with the specified opcode, name, operandType and rewrite.

Method Summary

Modifier and Type	Method	Description
protected void	calculateOperandPosition()
int	firstOperandIndex()
void	fixUpByteCodeTargets(ByteCode byteCode, CodeAttribute codeAttribute)	The ByteCodeForm knows how to fix up a bytecode if it needs to be fixed up because it holds a Label bytecode.
static ByteCodeForm	get(int opcode)	Gets a ByteCodeForm.
java.lang.String	getName()	Gets the name.
int	getOpcode()	Gets the opcode.
int[]	getRewrite()	Gets the rewrite array.
int[]	getRewriteCopy()	Gets a copy of the rewrite array.
boolean	hasMultipleByteCodes()	This method will answer true if the receiver is a multi-bytecode instruction (such as aload0_putfield_super); otherwise, it will answer false.
boolean	hasNoOperand()	Tests whether this instance has an operand.
boolean	nestedMustStartClassPool()
int	operandLength()	Gets the operand length.
abstract void	setByteCodeOperands(ByteCode byteCode, OperandManager operandManager, int codeLength)	Sets the rewrite of the byteCode.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

WIDENED

protected static final boolean WIDENED

See Also:

Constant Field Values

byteCodeArray

protected static final ByteCodeForm[] byteCodeArray

byteCodesByName

protected static final java.util.Map<java.lang.String,ByteCodeForm> byteCodesByName

Constructor Detail

ByteCodeForm

public ByteCodeForm(int opcode,
                    java.lang.String name)

Constructs a new instance with the specified opcode and name. Assume no rewrite.

Parameters:

opcode - index corresponding to the opcode's value.

name - printable name of the opcode.

ByteCodeForm

public ByteCodeForm(int opcode,
                    java.lang.String name,
                    int[] rewrite)

Constructs a new instance with the specified opcode, name, operandType and rewrite.

Parameters:

opcode - index corresponding to the opcode's value.

name - String printable name of the opcode.

rewrite - Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.

Method Detail

get

public static ByteCodeForm get(int opcode)

Gets a ByteCodeForm.

Parameters:

opcode - opcode index.

Returns:

the matching ByteCodeForm at the given opcode.

calculateOperandPosition

protected void calculateOperandPosition()

firstOperandIndex

public int firstOperandIndex()

fixUpByteCodeTargets

public void fixUpByteCodeTargets(ByteCode byteCode,
                                 CodeAttribute codeAttribute)

The ByteCodeForm knows how to fix up a bytecode if it needs to be fixed up because it holds a Label bytecode.

Parameters:

byteCode - a ByteCode to be fixed up

codeAttribute - a CodeAttribute used to determine how the ByteCode should be fixed up.

getName

public java.lang.String getName()

Gets the name.

Returns:

the name.

getOpcode

public int getOpcode()

Gets the opcode.

Returns:

the opcode.

getRewrite

public int[] getRewrite()

Gets the rewrite array.

Returns:

the rewrite array.

getRewriteCopy

public int[] getRewriteCopy()

Gets a copy of the rewrite array.

Returns:

a copy of the rewrite array.

hasMultipleByteCodes

public boolean hasMultipleByteCodes()

This method will answer true if the receiver is a multi-bytecode instruction (such as aload0_putfield_super); otherwise, it will answer false.

Returns:

boolean true if multibytecode, false otherwise

hasNoOperand

public boolean hasNoOperand()

Tests whether this instance has an operand.

Returns:

whether this instance has an operand.

nestedMustStartClassPool

public boolean nestedMustStartClassPool()

operandLength

public int operandLength()

Gets the operand length.

Returns:

the operand length.

setByteCodeOperands

public abstract void setByteCodeOperands(ByteCode byteCode,
                                         OperandManager operandManager,
                                         int codeLength)
                                  throws Pack200Exception

Sets the rewrite of the byteCode.

Parameters:

byteCode - ByteCode to be updated (!)

operandManager - OperandTable from which to draw info

codeLength - Length of bytes (excluding this bytecode) from the beginning of the method. Used in calculating padding for some variable-length bytecodes (such as lookupswitch, tableswitch).

Throws:

Pack200Exception - if a type is not supported or an index not in the range [0, Integer.MAX_VALUE].

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object