GameMaker函数导致YoYo Compiler编译失败但VM运行正常问题求助

我正在制作《Pizza Tower Online》的模组，遇到异常：YoYo Compiler（YYC）编译失败，但虚拟机（VM）可正常运行。使用的是GameMaker 2022.0.0.12 Runtime和2022.0.0.19 IDE。尝试过将|=语句改为result ||、添加保底的return false;、初始化result = false;等操作，均未解决问题。

引发问题的代码片段：

function instance_in_camera(inst = id, cam = view_camera[0])
{
    var camx = camera_get_view_x(cam);
    var camy = camera_get_view_y(cam);
    var camw = camera_get_view_width(cam);
    var camh = camera_get_view_height(cam);

    var result = false;
    var xx = inst.x - sprite_get_xoffset(inst.sprite_index);
    var yy = inst.y - sprite_get_yoffset(inst.sprite_index);

    // left bottom
    result = result || point_in_rectangle(xx + sprite_get_bbox_left(inst.sprite_index), yy + sprite_get_bbox_bottom(inst.sprite_index), camx, camy, camx + camw, camy + camh);
    if (result)
        return result;

    // left top
    if (!result)
    {
        result = result || point_in_rectangle(xx + sprite_get_bbox_left(inst.sprite_index), yy + sprite_get_bbox_top(inst.sprite_index), camx, camy, camx + camw, camy + camh);
        if (result)
            return result;
    }

    // right bottom
    if (!result)
    {
        result = result || point_in_rectangle(xx + sprite_get_bbox_right(inst.sprite_index), yy + sprite_get_bbox_bottom(inst.sprite_index), camx, camy, camx + camw, camy + camh);
        if (result)
            return result;
    }

    // right top
    if (!result)
    {
        result = result || point_in_rectangle(xx + sprite_get_bbox_right(inst.sprite_index), yy + sprite_get_bbox_top(inst.sprite_index), camx, camy, camx + camw, camy + camh);
        if (result)
            return result;
    }
    return false;
}

修复方案 #

• 添加有效性校验：YYC对变量有效性检查比VM严格，需提前过滤空实例、无效精灵和无效相机，在函数开头插入：

  if (!instance_exists(inst) || inst.sprite_index == no_sprite || cam == noone) {
      return false;
  }
  

• 简化分支逻辑：旧版本YYC对嵌套分支的优化存在Bug，去掉冗余的if (!result)判断，直接顺序检查（return true会提前终止函数，不影响性能），替换后的完整函数：

  function instance_in_camera(inst = id, cam = view_camera[0])
  {
      if (!instance_exists(inst) || inst.sprite_index == no_sprite || cam == noone) {
          return false;
      }
  
      var camx = camera_get_view_x(cam);
      var camy = camera_get_view_y(cam);
      var camw = camera_get_view_width(cam);
      var camh = camera_get_view_height(cam);
  
      var xx = inst.x - sprite_get_xoffset(inst.sprite_index);
      var yy = inst.y - sprite_get_yoffset(inst.sprite_index);
  
      if (point_in_rectangle(xx + sprite_get_bbox_left(inst.sprite_index), yy + sprite_get_bbox_bottom(inst.sprite_index), camx, camy, camx + camw, camy + camh)) {
          return true;
      }
      if (point_in_rectangle(xx + sprite_get_bbox_left(inst.sprite_index), yy + sprite_get_bbox_top(inst.sprite_index), camx, camy, camx + camw, camy + camh)) {
          return true;
      }
      if (point_in_rectangle(xx + sprite_get_bbox_right(inst.sprite_index), yy + sprite_get_bbox_bottom(inst.sprite_index), camx, camy, camx + camw, camy + camh)) {
          return true;
      }
      if (point_in_rectangle(xx + sprite_get_bbox_right(inst.sprite_index), yy + sprite_get_bbox_top(inst.sprite_index), camx, camy, camx + camw, camy + camh)) {
          return true;
      }
      return false;
  }
  

• 升级GameMaker版本：你使用的2022早期版本存在多个YYC编译已知Bug，建议升级到同系列的稳定版本（如2022.11.x），能直接修复部分兼容性问题。

内容的提问来源于stack exchange，提问作者Reycko