edu.polytechnique.xvm.asm.opcodes

Class RFR

java.lang.Object

edu.polytechnique.xvm.asm.interfaces.AsmInstruction

edu.polytechnique.xvm.asm.opcodes.RFR

public final class RFR
extends AsmInstruction

Push a copy of a stack entry relative to FP onto the stack

• Stack before: w0 ; w1 ; ... ; wSP-1
• Stack after: wSP-1-(FP+i) ; w0 ; w1 ; ... ; wSP-1 where i is the argument to RFR. Note that it must be that 0 ≤ FP + i ≤ SP - 1 or one of the stack exceptions will be triggered (see below).
• PC: +1
• SP: +1
• FP: unchanged
• R: unchanged
• Exceptions:
  • Stack underflow: i < -FP
  • Invalid stack access: i > SP - FP - 1
  • Stack overflow: The stack is already full, i.e., SP has its maximal value (default: 128)

See Also:

WFR, FETCH, READ

Constructor Summary

Constructors

Constructor and Description
RFR(int offset)

Method Summary

Modifier and Type	Method and Description
<P,R> R	accept(AsmVisitor<P,R> visitor, P arg)
int	getOffset()
java.lang.String	toString()

Methods inherited from class edu.polytechnique.xvm.asm.interfaces.AsmInstruction

getName

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RFR

public RFR(int offset)

Method Detail

getOffset

public int getOffset()

accept

public <P,R> R accept(AsmVisitor<P,R> visitor,
                      P arg)

Specified by:

accept in class AsmInstruction

toString

public java.lang.String toString()

Overrides:

toString in class AsmInstruction