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IRETURN.java

package gov.nasa.arc.ase.jpf.jvm.bytecode;

import gov.nasa.arc.ase.jpf.*;
import gov.nasa.arc.ase.jpf.jvm.*;
import de.fub.bytecode.generic.InstructionHandle;
import gov.nasa.arc.ase.util.Debug;

public class IRETURN extends AbstractInstruction {
  private de.fub.bytecode.generic.IRETURN peer;

  public InstructionHandle execute(SystemState ss, KernelState ks, ThreadInfo th) {
    MethodInfo mi = th.getCurrentMethod();

    if (mi.getMethodGen().isSynchronized()) {
      if (mi.getMethodGen().isStatic()) {
    ks.static_area.monitorUnlock(mi.getClassInfo().getClassName(), th);
      } else {
    ks.dynamic_area.monitorUnlock(th.getThis(), th);
      }
    }

    // pops the return value from the stack
    int value = th.pop();

    // removes the stack frame
    th.popFrame();
    th.removeArguments(mi);

    // push the return value on the caller stack
    th.push(value);

    return th.getPC().getNext();
  }  
  public void setPeer(de.fub.bytecode.generic.Instruction i) {
    peer = (de.fub.bytecode.generic.IRETURN)i;
  }  
}

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