Package serp.bytecode

Class IfInstruction

java.lang.Object

serp.bytecode.CodeEntry

serp.bytecode.Instruction

serp.bytecode.JumpInstruction

serp.bytecode.IfInstruction

All Implemented Interfaces:

BCEntity, InstructionPtr, VisitAcceptor

public class IfInstruction
extends JumpInstruction

An if instruction such as ifnull, ifeq, etc.

Field Summary

Fields inherited from class serp.bytecode.CodeEntry

byteIndex, next, prev

Constructor Summary

Constructors

Constructor	Description
IfInstruction(Code owner, int opcode)

Method Summary

Modifier and Type	Method	Description
void	acceptVisit(BCVisitor visit)	Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this one.
(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.
String	getTypeName()

Methods inherited from class serp.bytecode.JumpInstruction

equalsInstruction, getOffset, getTarget, read, read, replaceTarget, setOffset, 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

IfInstruction

IfInstruction(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

getTypeName

public String getTypeName()

acceptVisit

public void acceptVisit(BCVisitor visit)

Description copied from interface: VisitAcceptor

Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this one.

Specified by:

acceptVisit in interface VisitAcceptor

Overrides:

acceptVisit in class JumpInstruction