previous frame pointer

基本解釋

The back chain pointer points to the back chain pointer of the previous stack frame.
回鏈指針指向前一個堆棧框架的回鏈指針。
The final item in the stack frame is a pointer to the previous stack frame, often called the back pointer.
堆棧幀中的最后一個條目是一個指向前一堆棧幀的指針，通常被稱為后向指針（back pointer）。
Each stack frame holds a pointer to the previous stack frame (called the back chain pointer), as well as a space for return addresses for when it calls other functions.
每個堆?？蚣芏加幸粋€指向前一個堆棧框架的指針（稱為回鏈指針），還有一個當它調用其他函數(shù)時用于存放返回地址的空間。