code: @Override
      public void visitCode(Code obj) {
  
          stack.resetForMethodEntry(this);
          unendedZLIBs.clear();
          super.visitCode(obj);
  
          for (SourceLineAnnotation sa : unendedZLIBs.values()) {
              bugReporter.reportBug(new BugInstance(this, BugType.IOI_UNENDED_ZLIB_OBJECT.name(), NORMAL_PRIORITY)
                      .addClass(this).addMethod(this).addSourceLine(sa));
          }
      }
docs: implements the visitor to reset the opcode stack
  
  @param obj the currently parsed code block