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primops: Name stack reservation limits

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This commit is contained in:
Robert Hensing 2023-11-16 13:04:27 +01:00
parent 898c47384f
commit 1b9813e4e6
3 changed files with 21 additions and 4 deletions
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16
src/libexpr/primops.hh
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@ -8,6 +8,22 @@
namespace nix {
/**
* For functions where we do not expect deep recursion, we can use a sizable
* part of the stack a free allocation space.
*
* Note: this is expected to be multiplied by sizeof(Value), or about 24 bytes.
*/
constexpr size_t nonRecursiveStackReservation = 256;
/**
* Functions that maybe applied to self-similar inputs, such as concatMap on a
* tree, should reserve a smaller part of the stack for allocation.
*
* Note: this is expected to be multiplied by sizeof(Value), or about 24 bytes.
*/
constexpr size_t conservativeStackReservation = 16;
struct RegisterPrimOp
{
typedef std::vector<PrimOp> PrimOps;