Le 30/07/2021 à 15:24, Enrico Weigelt, metux IT consult a écrit : > On 21.07.21 14:36, Didier Kryn wrote: > >> I want to add to the comments that this alloca() function has been >> added (by gcc ?) to work around a missing feature of the C language: >> dynamic allocation on the stack. > > What you *actually* want is not "on stack" (directly), but automatically > freed when leaving the function scope - doing it by moving SP is just an > specific implementation. But actually a problematic one that needs great > caution: you usually don't know how much free stack you actually have.
The principle of stack allocation, when possible is a very efficient use of the memory and cpu: it is fast and requires no calculation. This stack is not necessarily "the stack of automatic variables"; any array can be managed as a stack by a custom allocator. This one, as you say is convenient because automatically reclaimed on return. -- Didier _______________________________________________ Dng mailing list Dng@lists.dyne.org https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
