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libexpr: Move *StackReservation constants to gc-small-vector.hh

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There are other places where it's useful to use these constants
(notably in eval.hh).
This commit is contained in:
Sergei Zimmerman 2025-09-24 01:04:58 +03:00
parent b7c6cf900f
commit 9789019a50
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2 changed files with 16 additions and 16 deletions
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16
src/libexpr/include/nix/expr/gc-small-vector.hh
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@ -26,4 +26,20 @@ using SmallValueVector = SmallVector<Value *, nItems>;
template<size_t nItems>
using SmallTemporaryValueVector = SmallVector<Value, nItems>;
/**
* 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 = 128;
/**
* 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;
} // namespace nix

16
src/libexpr/include/nix/expr/primops.hh
View file

@ -8,22 +8,6 @@
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 = 128;
/**
* 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;