Hacker News·3 min read·hard
How do functions like alloca allocate memory from the stack?
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✦AI Summary
This article explains the technical mechanism behind how the alloca function allocates memory on the stack in C. It details the use of the __chkstk function to ensure stack safety and prevent skipping over guard pages.
A little while ago, I talked about how compilers ensure that large stack allocations do not skip over the guard page . Shawn Van Ness was curious how this works with _alloca . “Does it do the necessary _chkstk() probing?”
technologyscience
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