serp.bytecode
Class LoadInstruction

java.lang.Object
  serp.bytecode.Instruction
      serp.bytecode.TypedInstruction
          serp.bytecode.LocalVariableInstruction
              serp.bytecode.LoadInstruction

All Implemented Interfaces:

BCEntity, VisitAcceptor

public class LoadInstruction
extends LocalVariableInstruction

Loads a value from the locals table to the stack.

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) LoadInstructions are equal if the type they reference the same type and locals index or if either is unset.
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.
boolean	isThis() Equivalent to getLocal () == 0 && getType () == Object.class; the this ptr is always passed in local variable 0.
LoadInstruction	setThis() Equivalent to setLocal (0).setType (Object.class); the this ptr is always passed in local variable 0.
TypedInstruction	setType(String type) Set the type of this instruction.

Methods inherited from class serp.bytecode.LocalVariableInstruction

getLocal, getLocalVariable, getParam, setLocal, setLocalVariable, setParam

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

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

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

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.

Overrides:

getTypeName in class LocalVariableInstruction

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.

Overrides:

setType in class LocalVariableInstruction

Returns:

this instruction, for method chaining

setThis

public LoadInstruction setThis()

Equivalent to setLocal (0).setType (Object.class); the this ptr is always passed in local variable 0.

Returns:

this instruction, for method chaining

isThis

public boolean isThis()

Equivalent to getLocal () == 0 && getType () == Object.class; the this ptr is always passed in local variable 0.

equalsInstruction

public boolean equalsInstruction(Instruction other)

LoadInstructions are equal if the type they reference the same type and locals index or if either is unset.

Overrides:

equalsInstruction in class LocalVariableInstruction

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