OpenJDK 27 · java.lang.classfile.attribute.CodeAttribute

Models the Code attribute (JVMS 4.7.3), which contains the bytecode of this method.

This attribute only appears on methods, and does not permit multiple instances in a method. It has a data dependency on the constant pool.

This attribute was introduced in the Java Platform version 1.0.2, major version 45.

API Note

CodeAttribute models properties of a Code attribute read from class files. General class file transformation should process and traverse a CodeModel in the traversal of a MethodModel, to support transformation of Code attributes currently being built.

Method Summary

Modifier and Type	Method and Description
public byte[]	Returns: the bytes (bytecode) of the code array codeArray() Returns the bytes (bytecode) of the code array.
public int	Returns: The length of the code array in bytes codeLength() Returns The length of the code array in bytes.
public int	Returns: the position of the `label` in the `codeArray` labelToBci(Label a marker for a position within this `CodeAttribute` label) Returns the position of the `label` in the `codeArray`.
public int	Returns: the maximum size of the local variable table maxLocals() Returns the maximum size of the local variable table.
public int	Returns: the maximum size of the operand stack maxStack() Returns the maximum size of the operand stack.

Inherited from java.lang.classfile.Attribute:: attributeMapper attributeName
Inherited from java.lang.classfile.CodeModel:: exceptionHandlers parent

Method Detail

codeArray	back to summary
public byte[] codeArray() Returns the bytes (bytecode) of the code array. Returns:byte[] the bytes (bytecode) of the code array

codeArray

back to summary

public byte[] codeArray()

Returns the bytes (bytecode) of the code array.

Returns:byte[]: the bytes (bytecode) of the code array

codeLength	back to summary
public int codeLength() Returns The length of the code array in bytes. Returns:int The length of the code array in bytes

codeLength

back to summary

public int codeLength()

Returns The length of the code array in bytes.

Returns:int: The length of the code array in bytes

labelToBci back to summary

labelToBci	back to summary
public int labelToBci(Label label) Returns the position of the `label` in the `codeArray`. The label represents a cursor pointing at immediately before the returned index into the `code` array. Parameters label:Label a marker for a position within this `CodeAttribute` Returns:int the position of the `label` in the `codeArray` Exceptions IllegalArgumentException: if the `label` is not from this attribute

public int labelToBci(Label label)

Returns the position of the label in the codeArray. The label represents a cursor pointing at immediately before the returned index into the code array.

Parameters

label:Label: a marker for a position within this CodeAttribute

Returns:int

the position of the label in the codeArray

Exceptions

IllegalArgumentException:: if the label is not from this attribute

maxLocals	back to summary
public int maxLocals() Returns the maximum size of the local variable table. Returns:int the maximum size of the local variable table

maxLocals

back to summary

public int maxLocals()

Returns the maximum size of the local variable table.

Returns:int: the maximum size of the local variable table

maxStack	back to summary
public int maxStack() Returns the maximum size of the operand stack. Returns:int the maximum size of the operand stack

maxStack

back to summary

public int maxStack()

Returns the maximum size of the operand stack.

Returns:int: the maximum size of the operand stack

public sealed Interface CodeAttribute

Method Summary

Method Detail