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package com.sun.org.apache.bcel.internal.generic;

Super class for JSR - Jump to subroutine
Version:
$Id: JsrInstruction.java 1749603 2016-06-21 20:50:19Z ggregory $/**
 * Super class for JSR - Jump to subroutine
 *
 * @version $Id: JsrInstruction.java 1749603 2016-06-21 20:50:19Z ggregory $
 */
public abstract class JsrInstruction extends BranchInstruction implements UnconditionalBranch,
        TypedInstruction, StackProducer {

    JsrInstruction(final short opcode, final InstructionHandle target) {
        super(opcode, target);
    }


    
Empty constructor needed for the Class.newInstance() statement in
Instruction.readInstruction(). Not to be used otherwise.
/**
     * Empty constructor needed for the Class.newInstance() statement in
     * Instruction.readInstruction(). Not to be used otherwise.
     */
    JsrInstruction() {
    }


    
Returns:
return address type/** @return return address type
     */
    @Override
    public Type getType( final ConstantPoolGen cp ) {
        return new ReturnaddressType(physicalSuccessor());
    }


    
Returns an InstructionHandle to the physical successor
of this JsrInstruction. For this method to work,
this JsrInstruction object must not be shared between
multiple InstructionHandle objects!
Formally, there must not be InstructionHandle objects
i, j where i != j and i.getInstruction() == this ==
j.getInstruction().
Returns:
an InstructionHandle to the "next" instruction that
will be executed when RETurned from a subroutine./**
     * Returns an InstructionHandle to the physical successor
     * of this JsrInstruction. <B>For this method to work,
     * this JsrInstruction object must not be shared between
     * multiple InstructionHandle objects!</B>
     * Formally, there must not be InstructionHandle objects
     * i, j where i != j and i.getInstruction() == this ==
     * j.getInstruction().
     * @return an InstructionHandle to the "next" instruction that
     * will be executed when RETurned from a subroutine.
     */
    public InstructionHandle physicalSuccessor() {
        InstructionHandle ih = super.getTarget();
        // Rewind!
        while (ih.getPrev() != null) {
            ih = ih.getPrev();
        }
        // Find the handle for "this" JsrInstruction object.
        while (ih.getInstruction() != this) {
            ih = ih.getNext();
        }
        final InstructionHandle toThis = ih;
        while (ih != null) {
            ih = ih.getNext();
            if ((ih != null) && (ih.getInstruction() == this)) {
                throw new RuntimeException("physicalSuccessor() called on a shared JsrInstruction.");
            }
        }
        // Return the physical successor
        return toThis.getNext();
    }
}