package railo.transformer.bytecode.visitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import railo.transformer.bytecode.BytecodeContext;
import railo.transformer.bytecode.Position;
import railo.transformer.bytecode.util.ExpressionUtil;
public final class WhileVisitor implements LoopVisitor {
private Label begin;
private Label end;
public void visitBeforeExpression(BytecodeContext bc) {
begin = new Label();
end = new Label();
bc.getAdapter().visitLabel(begin);
}
public void visitAfterExpressionBeforeBody(BytecodeContext bc) {
bc.getAdapter().ifZCmp(Opcodes.IFEQ, end);
}
public void visitAfterBody(BytecodeContext bc,Position endline) {
bc.getAdapter().visitJumpInsn(Opcodes.GOTO, begin);
bc.getAdapter().visitLabel(end);
ExpressionUtil.visitLine(bc, endline);
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#visitContinue(org.objectweb.asm.commons.GeneratorAdapter)
*/
public void visitContinue(BytecodeContext bc) {
bc.getAdapter().visitJumpInsn(Opcodes.GOTO, begin);
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#visitBreak(org.objectweb.asm.commons.GeneratorAdapter)
*/
public void visitBreak(BytecodeContext bc) {
bc.getAdapter().visitJumpInsn(Opcodes.GOTO, end);
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#getContinueLabel()
*/
public Label getContinueLabel() {
return begin;
}
/**
*
* @see railo.transformer.bytecode.visitor.LoopVisitor#getBreakLabel()
*/
public Label getBreakLabel() {
return end;
}
}