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add HAVE_BOEHMGC guards to batched allocation functions

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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
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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: