optimization - 释放已分配的内存

Question

在当前函数退出之前，是否可以显式释放 C 的 alloca() 分配的内存？如果是这样，怎么办？

Answer 1

来自http://www.gnu.org/software/libc/manual/html_mono/libc.html#Variable-Size-Automatic :

Allocating a block with alloca is an explicit action; you can allocate as many blocks as you wish, and compute the size at run time. But all the blocks are freed when you exit the function that alloca was called from, just as if they were automatic variables declared in that function. There is no way to free the space explicitly.