EDU.purdue.cs.bloat.file

Class Code

java.lang.Object

EDU.purdue.cs.bloat.file.Attribute

EDU.purdue.cs.bloat.file.Code

public class Code
extends Attribute

Code is used to store the Code attribute of a method in a class file. The Code attribute stores the raw bytecode of the method, the maximum stack height and maximum number of locals used by the method, and the exception handlers used in the method. Code may have several attributes. The local variable table and the line number table are modeled explicitly. All other attributes are modeled as generic attributes.

See Also:

Catch, GenericAttribute, LineNumberDebugInfo, LocalVariableTable

Field Summary

Fields inherited from class EDU.purdue.cs.bloat.file.Attribute

length, nameIndex

Constructor Summary

Constructors

Constructor and Description
Code(ClassInfo classInfo, java.io.DataInputStream in, int index, int len) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Object	clone()
byte[]	code() Get the bytes of the code.
int	codeLength() Return the length of the code array
Catch[]	exceptionHandlers() Get the exception handlers in the method.
int	length() Get the length of the attribute.
LineNumberDebugInfo[]	lineNumbers() Get the line number debug info for the code.
LocalDebugInfo[]	locals() Get the local variable debug info for the code.
int	maxLocals() Get the maximum number of locals used by the code.
int	maxStack() Get the maximum height of the operand stack used by the code.
void	setCode(byte[] code) Set the bytes of the code.
void	setExceptionHandlers(Catch[] handlers) Set the exception handlers in the method.
void	setLineNumbers(LineNumberDebugInfo[] lineNumbers) Set the line number debug info for the code.
void	setLocals(LocalDebugInfo[] locals) Set the local variable debug info for the code.
void	setMaxLocals(int maxLocals) Set the maximum number of locals used by the code.
void	setMaxStack(int maxStack) Set the maximum height of the operand stack used by the code.
java.lang.String	toString() Returns a string representation of the attribute.
void	writeData(java.io.DataOutputStream out) Write the attribute to a data stream.

Methods inherited from class EDU.purdue.cs.bloat.file.Attribute

nameIndex

Methods inherited from class java.lang.Object

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

Constructor Detail

Code

public Code(ClassInfo classInfo,
    java.io.DataInputStream in,
    int index,
    int len)
     throws java.io.IOException

Constructor. Create a Code attribute from a data stream.

Parameters:

in - The data stream containing the class file.

index - The index into the constant pool of the name of the attribute.

len - The length of the attribute, excluding the header.

Throws:

java.io.IOException - If an error occurs while reading.

Method Detail

writeData

public void writeData(java.io.DataOutputStream out)
               throws java.io.IOException

Write the attribute to a data stream.

Specified by:

writeData in class Attribute

Parameters:

out - The data stream of the class file.

Throws:

java.io.IOException - If an error occurs while writing.

setMaxStack

public void setMaxStack(int maxStack)

Set the maximum height of the operand stack used by the code.

Parameters:

maxStack - The maximum height of the stack.

setMaxLocals

public void setMaxLocals(int maxLocals)

Set the maximum number of locals used by the code.

Parameters:

maxLocals - The maximum number of locals.

maxStack

public int maxStack()

Get the maximum height of the operand stack used by the code.

Returns:

The maximum number of locals.

maxLocals

public int maxLocals()

Get the maximum number of locals used by the code.

Returns:

The maximum number of locals.

setExceptionHandlers

public void setExceptionHandlers(Catch[] handlers)

Set the exception handlers in the method.

Parameters:

handlers - The handlers.

length

public int length()

Get the length of the attribute.

Overrides:

length in class Attribute

Returns:

The length of the attribute.

lineNumbers

public LineNumberDebugInfo[] lineNumbers()

Get the line number debug info for the code.

Returns:

The line number debug info for the code.

locals

public LocalDebugInfo[] locals()

Get the local variable debug info for the code.

Returns:

The local variable debug info for the code.

setLineNumbers

public void setLineNumbers(LineNumberDebugInfo[] lineNumbers)

Set the line number debug info for the code.

Parameters:

lineNumbers - The line number debug info for the code.

setLocals

public void setLocals(LocalDebugInfo[] locals)

Set the local variable debug info for the code.

Parameters:

locals - The local variable debug info for the code.

exceptionHandlers

public Catch[] exceptionHandlers()

Get the exception handlers in the method.

Returns:

The handlers.

code

public byte[] code()

Get the bytes of the code.

Returns:

The code.

codeLength

public int codeLength()

Return the length of the code array

setCode

public void setCode(byte[] code)

Set the bytes of the code.

Parameters:

code - The code.

clone

public java.lang.Object clone()

Overrides:

clone in class Attribute

toString

public java.lang.String toString()

Returns a string representation of the attribute.

Overrides:

toString in class Attribute