package railo.transformer.bytecode.visitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.GeneratorAdapter;
import railo.transformer.bytecode.BytecodeContext;
// TODO testen wurde noch nicht getestet
public final class DoWhileVisitor implements LoopVisitor{
private Label begin;
private Label end;
private Label beforeEnd;
public void visitBeginBody(GeneratorAdapter mv) {
end = new Label();
beforeEnd = new Label();
begin=new Label();
mv.visitLabel(begin);
}
public void visitEndBodyBeginExpr(GeneratorAdapter mv) {
mv.visitLabel(beforeEnd);
}
public void visitEndExpr(GeneratorAdapter mv) {
mv.ifZCmp(Opcodes.IFNE, begin);
mv.visitLabel(end);
}
/**
* @see railo.transformer.bytecode.visitor.LoopVisitor#getBreakLabel()
*/
public Label getBreakLabel() {
return end;
}
/**
* @see railo.transformer.bytecode.visitor.LoopVisitor#getContinueLabel()
*/
public Label getContinueLabel() {
return beforeEnd;
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#visitContinue(org.objectweb.asm.commons.GeneratorAdapter)
*/
public void visitContinue(BytecodeContext bc) {
bc.getAdapter().visitJumpInsn(Opcodes.GOTO, getContinueLabel());
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#visitBreak(org.objectweb.asm.commons.GeneratorAdapter)
*/
public void visitBreak(BytecodeContext bc) {
bc.getAdapter().visitJumpInsn(Opcodes.GOTO, getBreakLabel());
}
}