content: package com.alibaba.qlexpress4.runtime.instruction;
  
  import com.alibaba.qlexpress4.QLOptions;
  import com.alibaba.qlexpress4.exception.ErrorReporter;
  import com.alibaba.qlexpress4.exception.QLErrorCodes;
  import com.alibaba.qlexpress4.runtime.QContext;
  import com.alibaba.qlexpress4.runtime.QResult;
  import com.alibaba.qlexpress4.utils.PrintlnUtils;
  
  import java.util.function.Consumer;
  
  /**
   * Operation: throw top element on the stack
   * Input: 1
   * Output: 0
   * <p>
   * Author: DQinYuan
   */
  public class ThrowInstruction extends QLInstruction {
      public ThrowInstruction(ErrorReporter errorReporter) {
          super(errorReporter);
      }
      
      @Override
      public QResult execute(QContext qContext, QLOptions qlOptions) {
          Object throwObj = qContext.pop().get();
          throw errorReporter.report(throwObj, QLErrorCodes.QL_THROW.name(), QLErrorCodes.QL_THROW.getErrorMsg());
      }
      
      @Override
      public int stackInput() {
          return 1;
      }
      
      @Override
      public int stackOutput() {
          return 0;
      }
      
      @Override
      public void println(int index, int depth, Consumer<String> debug) {
          PrintlnUtils.printlnByCurDepth(depth, index + ": Throw", debug);
      }
  }
  