serp.bytecode
Class ConvertInstruction

java.lang.Object
  serp.bytecode.Instruction
      serp.bytecode.TypedInstruction
          serp.bytecode.ConvertInstruction

All Implemented Interfaces:

BCEntity, VisitAcceptor

public class ConvertInstruction
extends TypedInstruction

A conversion opcode such as i2l, f2i, etc. Changing the types of the instruction will automatically update the underlying opcode. Converting from one type to the same type will result in a nop.

Author:

Abe White

Method Summary

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.
boolean	equalsInstruction(Instruction other) ConvertInstructions are equal if the types they convert between are either equal or unset.
Class	getFromType() Return the Class of the type being converted from.
BCClass	getFromTypeBC() Return the bytecode of the type being converted from.
String	getFromTypeName() Return the name of the type being converted from.
int	getLogicalStackChange() Return the logical number of stack positions changed by this instruction.
int	getStackChange() Return the number of stack positions this instruction pushes or pops during its execution.
String	getTypeName() Return the type name for this instruction.
ConvertInstruction	setFromType(BCClass type) Set the type being converted from.
ConvertInstruction	setFromType(Class type) Set the type being converted from.
ConvertInstruction	setFromType(String type) Set the type being converted from.
TypedInstruction	setType(String type) Set the type of this instruction.

Methods inherited from class serp.bytecode.TypedInstruction

getType, getTypeBC, setType, setType

Methods inherited from class serp.bytecode.Instruction

getByteIndex, getClassLoader, getCode, getLineNumber, getName, getOpcode, getPool, getProject, isValid

Methods inherited from class java.lang.Object

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

Method Detail

getLogicalStackChange

public int getLogicalStackChange()

Description copied from class: Instruction

Return the logical number of stack positions changed by this instruction. In other words, ignore weirdness with longs and doubles taking two stack positions.

Overrides:

getLogicalStackChange in class Instruction

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

getTypeName

public String getTypeName()

Description copied from class: TypedInstruction

Return the type name for this instruction. If the type has not been set, this method will return null.

Specified by:

getTypeName in class TypedInstruction

setType

public TypedInstruction setType(String type)

Description copied from class: TypedInstruction

Set the type of this instruction. Types that have no direct support will be converted accordingly.

Specified by:

setType in class TypedInstruction

Returns:

this instruction, for method chaining

getFromTypeName

public String getFromTypeName()

Return the name of the type being converted from. If neither type has been set, this method will return null.

getFromType

public Class getFromType()

Return the Class of the type being converted from. If neither type has been set, this method will return null.

getFromTypeBC

public BCClass getFromTypeBC()

Return the bytecode of the type being converted from. If neither type has been set, this method will return null.

setFromType

public ConvertInstruction setFromType(String type)

Set the type being converted from. Types that have no direct support will be converted accordingly.

Returns:

this instruction, for method chaining

setFromType

public ConvertInstruction setFromType(Class type)

Set the type being converted from. Types that have no direct support will be converted accordingly.

Returns:

this instruction, for method chaining

setFromType

public ConvertInstruction setFromType(BCClass type)

Set the type being converted from. Types that have no direct support will be converted accordingly.

Returns:

this instruction, for method chaining

equalsInstruction

public boolean equalsInstruction(Instruction other)

ConvertInstructions are equal if the types they convert between are either equal or unset.

Overrides:

equalsInstruction in class Instruction

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 Instruction