new关键字原理
https://www.zhihu.com/question/471023520
gcc 4.8.5 源码
https://github.com/gcc-mirror/gcc/tree/releases/gcc-4.8.5
new_op.cc
https://github.com/gcc-mirror/gcc/blob/releases/gcc-8/libstdc++-v3/libsupc++/new_op.cc#L42
宏定义相关
https://blog.csdn.net/Ivan804638781/article/details/111309760