max/nix-super
1
0
Fork 0
mirror of https://github.com/privatevoid-net/nix-super.git synced 2024-11-29 17:16:15 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

add HAVE_BOEHMGC guards to batched allocation functions

Browse source
This commit is contained in:
pennae 2022-01-05 01:48:26 +01:00
parent 8e2eaaaf69
commit 4d629c4f7a
2 changed files with 11 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
src/libexpr/eval-inline.hh
View file

@ -42,6 +42,7 @@ inline void * allocBytes(size_t n)
[[gnu::always_inline]]
Value * EvalState::allocValue()
{
#if HAVE_BOEHMGC
/* We use the boehm batch allocator to speed up allocations of Values (of which there are many).
GC_malloc_many returns a linked list of objects of the given size, where the first word
of each object is also the pointer to the next object in the list. This also means that we
@ -56,6 +57,9 @@ Value * EvalState::allocValue()
void * p = *valueAllocCache;
*valueAllocCache = GC_NEXT(p);
GC_NEXT(p) = nullptr;
#else
void * p = allocBytes(sizeof(Value));
#endif
nrValues++;
return (Value *) p;
@ -70,9 +74,8 @@ Env & EvalState::allocEnv(size_t size)
Env * env;
if (size != 1)
env = (Env *) allocBytes(sizeof(Env) + size * sizeof(Value *));
else {
#if HAVE_BOEHMGC
if (size == 1) {
/* see allocValue for explanations. */
if (!*env1AllocCache) {
*env1AllocCache = GC_malloc_many(sizeof(Env) + sizeof(Value *));
@ -83,7 +86,9 @@ Env & EvalState::allocEnv(size_t size)
*env1AllocCache = GC_NEXT(p);
GC_NEXT(p) = nullptr;
env = (Env *) p;
}
} else
#endif
env = (Env *) allocBytes(sizeof(Env) + size * sizeof(Value *));
env->type = Env::Plain;

2
src/libexpr/eval.hh
View file

@ -133,11 +133,13 @@ private:
/* Cache used by prim_match(). */
std::shared_ptr<RegexCache> regexCache;
#if HAVE_BOEHMGC
/* Allocation cache for GC'd Value objects. */
std::shared_ptr<void *> valueAllocCache;
/* Allocation cache for size-1 Env objects. */
std::shared_ptr<void *> env1AllocCache;
#endif
public: