CompletelyClearInstanceofCache();
- // TODO(1605) select heuristic for flushing NumberString cache with
- // FlushNumberStringCache
+ FlushNumberStringCache();
if (FLAG_cleanup_code_caches_at_gc) {
polymorphic_code_cache()->set_cache(undefined_value());
}
}
set_intrinsic_function_names(StringDictionary::cast(obj));
- if (InitializeNumberStringCache()->IsFailure()) return false;
+ { MaybeObject* maybe_obj = AllocateInitialNumberStringCache();
+ if (!maybe_obj->ToObject(&obj)) return false;
+ }
+ set_number_string_cache(FixedArray::cast(obj));
// Allocate cache for single character ASCII strings.
{ MaybeObject* maybe_obj =
}
-MaybeObject* Heap::InitializeNumberStringCache() {
- // Compute the size of the number string cache based on the max heap size.
- // max_semispace_size_ == 512 KB => number_string_cache_size = 32.
- // max_semispace_size_ == 8 MB => number_string_cache_size = 16KB.
- int number_string_cache_size = max_semispace_size_ / 512;
- number_string_cache_size = Max(32, Min(16*KB, number_string_cache_size));
- Object* obj;
+MaybeObject* Heap::AllocateInitialNumberStringCache() {
MaybeObject* maybe_obj =
- AllocateFixedArray(number_string_cache_size * 2, TENURED);
- if (maybe_obj->ToObject(&obj)) set_number_string_cache(FixedArray::cast(obj));
+ AllocateFixedArray(kInitialNumberStringCacheSize * 2, TENURED);
return maybe_obj;
}
+int Heap::FullSizeNumberStringCacheLength() {
+ // Compute the size of the number string cache based on the max newspace size.
+ // The number string cache has a minimum size based on twice the initial cache
+ // size to ensure that it is bigger after being made 'full size'.
+ int number_string_cache_size = max_semispace_size_ / 512;
+ number_string_cache_size = Max(kInitialNumberStringCacheSize * 2,
+ Min(0x4000, number_string_cache_size));
+ // There is a string and a number per entry so the length is twice the number
+ // of entries.
+ return number_string_cache_size * 2;
+}
+
+
+void Heap::AllocateFullSizeNumberStringCache() {
+ // The idea is to have a small number string cache in the snapshot to keep
+ // boot-time memory usage down. If we expand the number string cache already
+ // while creating the snapshot then that didn't work out.
+ ASSERT(!Serializer::enabled());
+ MaybeObject* maybe_obj =
+ AllocateFixedArray(FullSizeNumberStringCacheLength(), TENURED);
+ Object* new_cache;
+ if (maybe_obj->ToObject(&new_cache)) {
+ // We don't bother to repopulate the cache with entries from the old cache.
+ // It will be repopulated soon enough with new strings.
+ set_number_string_cache(FixedArray::cast(new_cache));
+ }
+ // If allocation fails then we just return without doing anything. It is only
+ // a cache, so best effort is OK here.
+}
+
+
void Heap::FlushNumberStringCache() {
// Flush the number to string cache.
int len = number_string_cache()->length();
int mask = (number_string_cache()->length() >> 1) - 1;
if (number->IsSmi()) {
hash = smi_get_hash(Smi::cast(number)) & mask;
- number_string_cache()->set(hash * 2, Smi::cast(number));
} else {
hash = double_get_hash(number->Number()) & mask;
- number_string_cache()->set(hash * 2, number);
}
+ if (number_string_cache()->get(hash * 2) != undefined_value() &&
+ number_string_cache()->length() != FullSizeNumberStringCacheLength()) {
+ // The first time we have a hash collision, we move to the full sized
+ // number string cache.
+ AllocateFullSizeNumberStringCache();
+ return;
+ }
+ number_string_cache()->set(hash * 2, number);
number_string_cache()->set(hash * 2 + 1, string);
}
GCTracer* tracer_;
- // Initializes the number to string cache based on the max semispace size.
- MUST_USE_RESULT MaybeObject* InitializeNumberStringCache();
+ // Allocates a small number to string cache.
+ MUST_USE_RESULT MaybeObject* AllocateInitialNumberStringCache();
+ // Creates and installs the full-sized number string cache.
+ void AllocateFullSizeNumberStringCache();
+ // Get the length of the number to string cache based on the max semispace
+ // size.
+ int FullSizeNumberStringCacheLength();
// Flush the number to string cache.
void FlushNumberStringCache();
static const int kInitialSymbolTableSize = 2048;
static const int kInitialEvalCacheSize = 64;
+ static const int kInitialNumberStringCacheSize = 256;
// Maximum GC pause.
int max_gc_pause_;