Class FrameNode

java.lang.Object

org.objectweb.asm.tree.AbstractInsnNode

org.objectweb.asm.tree.FrameNode

public class FrameNode
extends AbstractInsnNode

A node that represents a stack map frame. These nodes are pseudo instruction nodes in order to be inserted in an instruction list. In fact these nodes must(*) be inserted just before any instruction node i that follows an unconditionnal branch instruction such as GOTO or THROW, that is the target of a jump instruction, or that starts an exception handler block. The stack map frame types must describe the values of the local variables and of the operand stack elements just before i is executed.

(*) this is mandatory only for classes whose version is greater than or equal to V1_6.

Author:

Eric Bruneton

Field Summary

Fields

Modifier and Type	Field	Description
List	local	The types of the local variables of this stack map frame.
List	stack	The types of the operand stack elements of this stack map frame.
int	type	The type of this frame.

Fields inherited from class AbstractInsnNode

FIELD_INSN, FRAME, IINC_INSN, INSN, INT_INSN, JUMP_INSN, LABEL, LDC_INSN, LINE, LOOKUPSWITCH_INSN, METHOD_INSN, MULTIANEWARRAY_INSN, opcode, TABLESWITCH_INSN, TYPE_INSN, VAR_INSN

Constructor Summary

Constructors

Constructor	Description
FrameNode(int type, int nLocal, Object[] local, int nStack, Object[] stack)	Constructs a new FrameNode.

Method Summary

Modifier and Type	Method	Description
void	accept(MethodVisitor mv)	Makes the given visitor visit this stack map frame.
AbstractInsnNode	clone(Map labels)	Returns a copy of this instruction.
int	getType()	Returns the type of this instruction.

Methods inherited from class AbstractInsnNode

getNext, getOpcode, getPrevious

Methods inherited from class Object

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

Field Details

type

public int type

The type of this frame. Must be Opcodes.F_NEW for expanded frames, or Opcodes.F_FULL, Opcodes.F_APPEND, Opcodes.F_CHOP, Opcodes.F_SAME or Opcodes.F_APPEND, Opcodes.F_SAME1 for compressed frames.

local

public List local

The types of the local variables of this stack map frame. Elements of this list can be Integer, String or LabelNode objects (for primitive, reference and uninitialized types respectively - see MethodVisitor).

stack

public List stack

The types of the operand stack elements of this stack map frame. Elements of this list can be Integer, String or LabelNode objects (for primitive, reference and uninitialized types respectively - see MethodVisitor).

Constructor Details

FrameNode

public FrameNode(int type,
 int nLocal,
 Object[] local,
 int nStack,
 Object[] stack)

Constructs a new FrameNode.

Parameters:

type - the type of this frame. Must be Opcodes.F_NEW for expanded frames, or Opcodes.F_FULL, Opcodes.F_APPEND, Opcodes.F_CHOP, Opcodes.F_SAME or Opcodes.F_APPEND, Opcodes.F_SAME1 for compressed frames.

nLocal - number of local variables of this stack map frame.

local - the types of the local variables of this stack map frame. Elements of this list can be Integer, String or LabelNode objects (for primitive, reference and uninitialized types respectively - see MethodVisitor).

nStack - number of operand stack elements of this stack map frame.

stack - the types of the operand stack elements of this stack map frame. Elements of this list can be Integer, String or LabelNode objects (for primitive, reference and uninitialized types respectively - see MethodVisitor).

Method Details

getType

public int getType()

Description copied from class: AbstractInsnNode

Returns the type of this instruction.

Specified by:

getType in class AbstractInsnNode

Returns:

the type of this instruction, i.e. one the constants defined in this class.

accept

public void accept(MethodVisitor mv)

Makes the given visitor visit this stack map frame.

Specified by:

accept in class AbstractInsnNode

Parameters:

mv - a method visitor.

clone

public AbstractInsnNode clone(Map labels)

Description copied from class: AbstractInsnNode

Returns a copy of this instruction.

Specified by:

clone in class AbstractInsnNode

Parameters:

labels - a map from LabelNodes to cloned LabelNodes.

Returns:

a copy of this instruction. The returned instruction does not belong to any InsnList.