Package serp.bytecode

Class GotoInstruction

java.lang.Object

serp.bytecode.CodeEntry

serp.bytecode.Instruction

serp.bytecode.JumpInstruction

serp.bytecode.GotoInstruction

All Implemented Interfaces:

BCEntity, InstructionPtr, VisitAcceptor

public class GotoInstruction
extends JumpInstruction

An instruction that specifies a position in the code block to jump to. Examples include go2, jsr, etc.

Field Summary

Fields inherited from class serp.bytecode.CodeEntry

byteIndex, next, prev

Constructor Summary

Constructors

Constructor	Description
GotoInstruction(Code owner, int opcode)

Method Summary

Modifier and Type	Method	Description
private void	calculateOpcode()	Calculate our opcode based on the offset size.
(package private) int	getLength()	Return the length in bytes of this opcode, including all arguments.
int	getStackChange()	Return the number of stack positions this instruction pushes or pops during its execution.
void	setOffset(int offset)

Methods inherited from class serp.bytecode.JumpInstruction

acceptVisit, equalsInstruction, getOffset, getTarget, read, read, replaceTarget, setTarget, updateTargets, write

Methods inherited from class serp.bytecode.Instruction

getByteIndex, getClassLoader, getCode, getLineNumber, getLogicalStackChange, getName, getOpcode, getPool, getProject, invalidate, invalidateByteIndexes, isValid, setOpcode

Methods inherited from class java.lang.Object

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

Methods inherited from interface serp.bytecode.InstructionPtr

getCode

Constructor Details

GotoInstruction

GotoInstruction(Code owner,
 int opcode)

Method Details

getStackChange

public int getStackChange()

Description copied from class: Instruction

Return the number of stack positions this instruction pushes or pops during its execution.

Overrides:

getStackChange in class Instruction

Returns:

0 if the stack is not affected by this instruction, a positive number if it pushes onto the stack, and a negative number if it pops from the stack

getLength

int getLength()

Description copied from class: Instruction

Return the length in bytes of this opcode, including all arguments. For many opcodes this method relies on an up-to-date byte index.

Overrides:

getLength in class Instruction

setOffset

public void setOffset(int offset)

Overrides:

setOffset in class JumpInstruction

calculateOpcode

private void calculateOpcode()

Calculate our opcode based on the offset size.