Interface CodeAttribute

All Superinterfaces:: Attribute<CodeAttribute>, AttributedElement, ClassFileElement, CodeModel, CompoundElement<CodeElement>, Iterable<CodeElement>, MethodElement

public sealed interface CodeAttribute extends Attribute<CodeAttribute>, CodeModel

Models the Code attribute (JVMS Â§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.

See Java Virtual Machine Specification:

4.7.3 The Code Attribute

Since:

See Also:

Method Summary

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

Methods declared in interface Attribute

attributeMapper, attributeName

Modifier and Type	Method	Description
`AttributeMapper<CodeAttribute>`	`attributeMapper()`	Returns the `AttributeMapper` associated with this attribute.
`Utf8Entry`	`attributeName()`	Returns the name of the attribute.

Methods declared in interface AttributedElement

attributes, findAttribute, findAttributes

Modifier and Type	Method	Description
`List<Attribute<?>>`	`attributes()`	Returns the attributes of this structure.
`default <T extends Attribute<T>> Optional<T>`	`findAttribute(AttributeMapper<T> attr)`	Finds an attribute by name.
`default <T extends Attribute<T>> List<T>`	`findAttributes(AttributeMapper<T> attr)`	Finds attributes by name.

Methods declared in interface CodeModel

exceptionHandlers, parent

Modifier and Type	Method	Description
`List<ExceptionCatch>`	`exceptionHandlers()`	Returns the exception table of the method.
`Optional<MethodModel>`	`parent()`	Returns the enclosing method, if known.

Methods declared in interface CompoundElement

elementList, elementStream, forEach, iterator, toDebugString

Modifier and Type	Method	Description
`default List<CodeElement>`	`elementList()`	Returns a `List` containing all member elements in this compound element.
`default Stream<CodeElement>`	`elementStream()`	Returns a `Stream` containing all member elements in this compound element.
`void`	`forEach(Consumer<? super CodeElement> consumer)`	Invokes the provided handler with each member element in this compound element.
`default Iterator<CodeElement>`	`iterator()`	Returns an `Iterator` describing all member elements in this compound element.
`default String`	`toDebugString()`	Returns a text representation of the compound element and its contents for debugging purposes.

Methods declared in interface Iterable

spliterator

Modifier and Type	Method	Description
`default Spliterator<CodeElement>`	`spliterator()`	Creates a `Spliterator` over the elements described by this `Iterable`.

Method Details

maxLocals

int maxLocals()

Returns the maximum size of the local variable table.

Returns:: the maximum size of the local variable table

maxStack

int maxStack()

Returns the maximum size of the operand stack.

Returns:: the maximum size of the operand stack

codeLength

int codeLength()

Returns The length of the code array in bytes.

Returns:: The length of the code array in bytes

codeArray

byte[] codeArray()

Returns the bytes (bytecode) of the code array.

Returns:: the bytes (bytecode) of the code array

labelToBci

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 - a marker for a position within this CodeAttribute
Returns:: the position of the label in the codeArray
Throws:: IllegalArgumentException - if the label is not from this attribute

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