/**
* Returns the ReferentEntry for the specified object or creates one and adds
* it to the referents hash if none exists. referentsLock MUST be held.
*/
static ReferentEntry* getReferentEntryForObject(Env* env, Object* o) {
void* key = (void*) GC_HIDE_POINTER(o); // Hide the pointer from the GC so that the key doesn't prevent the object from being GCed.
ReferentEntry* referentEntry;
HASH_FIND_PTR(referents, &key, referentEntry);
if (!referentEntry) {
// Object is not in the hashtable. Add it.
referentEntry = allocateMemoryOfKind(env, sizeof(ReferentEntry), referentEntryGCKind);
if (!referentEntry) return NULL; // OOM thrown
referentEntry->key = key;
HASH_ADD_PTR(referents, key, referentEntry);
}
return referentEntry;
}
/**
* Adds a string to the cache of interned string. The string must not already be
* interned. The internedStringsLock MUST be held when calling this function.
*/
static jboolean addInternedString(Env* env, const char* s, Object* string) {
CacheEntry* cacheEntry = allocateMemoryOfKind(env, sizeof(CacheEntry), cacheEntryGCKind);
if (!cacheEntry) {
return FALSE;
}
cacheEntry->key = s;
cacheEntry->string = string;
HASH_ADD_KEYPTR(hh, internedStrings, cacheEntry->key, strlen(cacheEntry->key), cacheEntry);
// prune the cache to MAX_CACHE_SIZE
if (HASH_COUNT(internedStrings) >= MAX_CACHE_SIZE) {
CacheEntry* tmpEntry;
HASH_ITER(hh, internedStrings, cacheEntry, tmpEntry) {
// prune the first entry (loop is based on insertion order so this deletes the oldest item)
HASH_DELETE(hh, internedStrings, cacheEntry);
break;
}