Their regular and standardized shapes would have made them simple to stack and store.
它们形状规则且标准,极易堆放储藏。
2
When longer call chains are involved, it becomes more complicated to know who called whom, so a simple solution is to maintain a stack of the entry addresses.
This simple design, possible because the data obeys strict LIFO order, means that no complex data structure is needed to track stack contents - a simple pointer to the top of the stack will do.