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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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3
src/libexpr/eval.cc
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@ -1,6 +1,7 @@
#include "eval.hh"
#include "eval-settings.hh"
#include "hash.hh"
#include "primops.hh"
#include "types.hh"
#include "util.hh"
#include "store-api.hh"
@ -2015,7 +2016,7 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
return result;
};
boost::container::small_vector<Value, 16> values(es->size());
boost::container::small_vector<Value, conservativeStackReservation> values(es->size());
Value * vTmpP = values.data();
for (auto & [i_pos, i] : *es) {

6
src/libexpr/primops.cc
View file

@ -2728,7 +2728,7 @@ static void prim_catAttrs(EvalState & state, const PosIdx pos, Value * * args, V
auto attrName = state.symbols.create(state.forceStringNoCtx(*args[0], pos, "while evaluating the first argument passed to builtins.catAttrs"));
state.forceList(*args[1], pos, "while evaluating the second argument passed to builtins.catAttrs");
boost::container::small_vector<Value *, 256> res(args[1]->listSize());
boost::container::small_vector<Value *, nonRecursiveStackReservation> res(args[1]->listSize());
size_t found = 0;
for (auto v2 : args[1]->listItems()) {
@ -3063,7 +3063,7 @@ static void prim_filter(EvalState & state, const PosIdx pos, Value * * args, Val
state.forceFunction(*args[0], pos, "while evaluating the first argument passed to builtins.filter");
boost::container::small_vector<Value *, 256> vs(args[1]->listSize());
boost::container::small_vector<Value *, nonRecursiveStackReservation> vs(args[1]->listSize());
size_t k = 0;
bool same = true;
@ -3452,7 +3452,7 @@ static void prim_concatMap(EvalState & state, const PosIdx pos, Value * * args,
state.forceList(*args[1], pos, "while evaluating the second argument passed to builtins.concatMap");
auto nrLists = args[1]->listSize();
boost::container::small_vector<Value, 16> lists(nrLists);
boost::container::small_vector<Value, conservativeStackReservation> lists(nrLists);
size_t len = 0;
for (unsigned int n = 0; n < nrLists; ++n) {

16
src/libexpr/primops.hh
View file

@ -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;