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Bug 1710075 part 1 - Add CanUseFixedElementsForArray helper function. r=jonco

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Differential Revision: https://phabricator.services.mozilla.com/D114603
This commit is contained in:
Jan de Mooij 2021-05-10 11:50:19 +00:00
parent 5689f0cd89
commit fd935d4299
1 changed files with 9 additions and 3 deletions
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12
js/src/gc/ObjectKind-inl.h
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@ -46,6 +46,14 @@ static inline AllocKind GetGCObjectKind(const JSClass* clasp) {
return GetGCObjectKind(nslots);
}
static bool CanUseFixedElementsForArray(size_t numElements) {
if (numElements > NativeObject::MAX_DENSE_ELEMENTS_COUNT) {
return false;
}
size_t numSlots = numElements + ObjectElements::VALUES_PER_HEADER;
return numSlots < SLOTS_TO_THING_KIND_LIMIT;
}
/* As for GetGCObjectKind, but for dense array allocation. */
static inline AllocKind GetGCArrayKind(size_t numElements) {
/*
@ -55,9 +63,7 @@ static inline AllocKind GetGCArrayKind(size_t numElements) {
* unused.
*/
static_assert(ObjectElements::VALUES_PER_HEADER == 2);
if (numElements > NativeObject::MAX_DENSE_ELEMENTS_COUNT ||
numElements + ObjectElements::VALUES_PER_HEADER >=
SLOTS_TO_THING_KIND_LIMIT) {
if (!CanUseFixedElementsForArray(numElements)) {
return AllocKind::OBJECT2;
}
return slotsToThingKind[numElements + ObjectElements::VALUES_PER_HEADER];