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Use boost::container::small_vector in place of VLAs
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12
boehmgc-traceable_allocator-public.diff
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12
boehmgc-traceable_allocator-public.diff
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@ -0,0 +1,12 @@
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diff --git a/include/gc_allocator.h b/include/gc_allocator.h
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index 597c7f13..587286be 100644
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--- a/include/gc_allocator.h
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+++ b/include/gc_allocator.h
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@@ -312,6 +312,7 @@ public:
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template<>
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class traceable_allocator<void> {
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+public:
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef void* pointer;
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@ -230,6 +230,9 @@
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}).overrideAttrs(o: {
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}).overrideAttrs(o: {
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patches = (o.patches or []) ++ [
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patches = (o.patches or []) ++ [
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./boehmgc-coroutine-sp-fallback.diff
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./boehmgc-coroutine-sp-fallback.diff
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# https://github.com/ivmai/bdwgc/pull/586
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./boehmgc-traceable_allocator-public.diff
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];
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];
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})
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})
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)
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)
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@ -16,6 +16,7 @@
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#include "fs-input-accessor.hh"
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#include "fs-input-accessor.hh"
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#include "memory-input-accessor.hh"
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#include "memory-input-accessor.hh"
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#include "signals.hh"
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#include "signals.hh"
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#include "gc-small-vector.hh"
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#include <algorithm>
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#include <algorithm>
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#include <chrono>
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#include <chrono>
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@ -31,6 +32,7 @@
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#include <sys/resource.h>
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#include <sys/resource.h>
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#include <nlohmann/json.hpp>
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#include <nlohmann/json.hpp>
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#include <boost/container/small_vector.hpp>
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#if HAVE_BOEHMGC
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#if HAVE_BOEHMGC
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@ -1709,7 +1711,7 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
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/* We have all the arguments, so call the primop with
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/* We have all the arguments, so call the primop with
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the previous and new arguments. */
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the previous and new arguments. */
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Value * vArgs[arity];
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Value * vArgs[maxPrimOpArity];
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auto n = argsDone;
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auto n = argsDone;
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for (Value * arg = &vCur; arg->isPrimOpApp(); arg = arg->primOpApp.left)
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for (Value * arg = &vCur; arg->isPrimOpApp(); arg = arg->primOpApp.left)
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vArgs[--n] = arg->primOpApp.right;
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vArgs[--n] = arg->primOpApp.right;
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@ -1772,11 +1774,11 @@ void ExprCall::eval(EvalState & state, Env & env, Value & v)
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// 4: about 60
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// 4: about 60
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// 5: under 10
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// 5: under 10
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// This excluded attrset lambdas (`{...}:`). Contributions of mixed lambdas appears insignificant at ~150 total.
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// This excluded attrset lambdas (`{...}:`). Contributions of mixed lambdas appears insignificant at ~150 total.
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Value * vArgs[args.size()];
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SmallValueVector<4> vArgs(args.size());
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for (size_t i = 0; i < args.size(); ++i)
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for (size_t i = 0; i < args.size(); ++i)
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vArgs[i] = args[i]->maybeThunk(state, env);
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vArgs[i] = args[i]->maybeThunk(state, env);
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state.callFunction(vFun, args.size(), vArgs, v, pos);
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state.callFunction(vFun, args.size(), vArgs.data(), v, pos);
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}
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}
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@ -2015,8 +2017,9 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
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return result;
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return result;
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};
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};
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Value values[es->size()];
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// List of returned strings. References to these Values must NOT be persisted.
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Value * vTmpP = values;
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SmallTemporaryValueVector<conservativeStackReservation> values(es->size());
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Value * vTmpP = values.data();
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for (auto & [i_pos, i] : *es) {
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for (auto & [i_pos, i] : *es) {
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Value & vTmp = *vTmpP++;
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Value & vTmp = *vTmpP++;
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42
src/libexpr/gc-small-vector.hh
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42
src/libexpr/gc-small-vector.hh
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@ -0,0 +1,42 @@
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#pragma once
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#include <boost/container/small_vector.hpp>
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#if HAVE_BOEHMGC
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#include <gc/gc.h>
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#include <gc/gc_cpp.h>
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#include <gc/gc_allocator.h>
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#endif
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namespace nix {
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struct Value;
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/**
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* A GC compatible vector that may used a reserved portion of `nItems` on the stack instead of allocating on the heap.
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*/
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#if HAVE_BOEHMGC
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template <typename T, size_t nItems>
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using SmallVector = boost::container::small_vector<T, nItems, traceable_allocator<T>>;
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#else
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template <typename T, size_t nItems>
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using SmallVector = boost::container::small_vector<T, nItems>;
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#endif
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/**
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* A vector of value pointers. See `SmallVector`.
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*/
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template <size_t nItems>
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using SmallValueVector = SmallVector<Value *, nItems>;
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/**
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* A vector of values that must not be referenced after the vector is destroyed.
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*
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* See also `SmallValueVector`.
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*/
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template <size_t nItems>
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using SmallTemporaryValueVector = SmallVector<Value, nItems>;
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}
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@ -4,6 +4,7 @@
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#include "eval-inline.hh"
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#include "eval-inline.hh"
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#include "eval.hh"
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#include "eval.hh"
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#include "eval-settings.hh"
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#include "eval-settings.hh"
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#include "gc-small-vector.hh"
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#include "globals.hh"
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#include "globals.hh"
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#include "json-to-value.hh"
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#include "json-to-value.hh"
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#include "names.hh"
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#include "names.hh"
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@ -2729,7 +2730,7 @@ static void prim_catAttrs(EvalState & state, const PosIdx pos, Value * * args, V
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auto attrName = state.symbols.create(state.forceStringNoCtx(*args[0], pos, "while evaluating the first argument passed to builtins.catAttrs"));
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auto attrName = state.symbols.create(state.forceStringNoCtx(*args[0], pos, "while evaluating the first argument passed to builtins.catAttrs"));
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state.forceList(*args[1], pos, "while evaluating the second argument passed to builtins.catAttrs");
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state.forceList(*args[1], pos, "while evaluating the second argument passed to builtins.catAttrs");
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Value * res[args[1]->listSize()];
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SmallValueVector<nonRecursiveStackReservation> res(args[1]->listSize());
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size_t found = 0;
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size_t found = 0;
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for (auto v2 : args[1]->listItems()) {
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for (auto v2 : args[1]->listItems()) {
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@ -3064,8 +3065,7 @@ static void prim_filter(EvalState & state, const PosIdx pos, Value * * args, Val
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state.forceFunction(*args[0], pos, "while evaluating the first argument passed to builtins.filter");
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state.forceFunction(*args[0], pos, "while evaluating the first argument passed to builtins.filter");
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// FIXME: putting this on the stack is risky.
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SmallValueVector<nonRecursiveStackReservation> vs(args[1]->listSize());
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Value * vs[args[1]->listSize()];
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size_t k = 0;
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size_t k = 0;
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bool same = true;
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bool same = true;
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@ -3454,7 +3454,8 @@ static void prim_concatMap(EvalState & state, const PosIdx pos, Value * * args,
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state.forceList(*args[1], pos, "while evaluating the second argument passed to builtins.concatMap");
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state.forceList(*args[1], pos, "while evaluating the second argument passed to builtins.concatMap");
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auto nrLists = args[1]->listSize();
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auto nrLists = args[1]->listSize();
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Value lists[nrLists];
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// List of returned lists before concatenation. References to these Values must NOT be persisted.
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SmallTemporaryValueVector<conservativeStackReservation> lists(nrLists);
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size_t len = 0;
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size_t len = 0;
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for (unsigned int n = 0; n < nrLists; ++n) {
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for (unsigned int n = 0; n < nrLists; ++n) {
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