edu.polytechnique.xvm.asm.opcodes

Class GSB

java.lang.Object

edu.polytechnique.xvm.asm.interfaces.AsmInstruction

edu.polytechnique.xvm.asm.opcodes.GSB

public final class GSB
extends AsmInstruction

Enter a subroutine

Assume that oldSP, oldFP, and oldPC are the values of SP, FP, and PC registers respectively before executing the instruction.

• Stack before: S (i.e., arbitrary)
• Stack after: oldPC + 1 ; oldFP ; S
• PC: changes to m where m is the instruction position pointed to by the argument to GSB.
• SP: changes to oldSP + 2
• FP: changes to oldSP
• R: unchanged
• Exceptions:
  • Stack overflow: it is impossible to push two words onto the stack.
  • Invalid PC: the instruction position pointed to by m does not exist

See Also:

RET, GTO

Constructor Summary

Constructors

Constructor and Description
GSB()
GSB(java.lang.String address)

Method Summary

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

GSB

public GSB()

GSB

public GSB(java.lang.String address)

Method Detail

getAddress

public java.lang.String getAddress()

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