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8334220: Optimize Klass layout after JDK-8180450

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Reviewed-by: coleenp, stuefe, dholmes
This commit is contained in:
Xiaolong Peng 2024-07-03 02:56:17 +00:00 committed by David Holmes
parent f7af4504a8
commit f9b4ea13e6
1 changed files with 5 additions and 5 deletions
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10
src/hotspot/share/oops/klass.hpp
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@ -159,11 +159,6 @@ class Klass : public Metadata {
// Provide access the corresponding instance java.lang.ClassLoader. // Provide access the corresponding instance java.lang.ClassLoader.
ClassLoaderData* _class_loader_data; ClassLoaderData* _class_loader_data;
// Bitmap and hash code used by hashed secondary supers.
uintx _bitmap;
uint8_t _hash_slot;
static uint8_t compute_hash_slot(Symbol* s);
int _vtable_len; // vtable length. This field may be read very often when we int _vtable_len; // vtable length. This field may be read very often when we
// have lots of itable dispatches (e.g., lambdas and streams). // have lots of itable dispatches (e.g., lambdas and streams).
@ -173,6 +168,10 @@ class Klass : public Metadata {
JFR_ONLY(DEFINE_TRACE_ID_FIELD;) JFR_ONLY(DEFINE_TRACE_ID_FIELD;)
// Bitmap and hash code used by hashed secondary supers.
uintx _bitmap;
uint8_t _hash_slot;
private: private:
// This is an index into FileMapHeader::_shared_path_table[], to // This is an index into FileMapHeader::_shared_path_table[], to
// associate this class with the JAR file where it's loaded from during // associate this class with the JAR file where it's loaded from during
@ -392,6 +391,7 @@ protected:
void set_next_sibling(Klass* s); void set_next_sibling(Klass* s);
private: private:
static uint8_t compute_hash_slot(Symbol* s);
static void hash_insert(Klass* klass, GrowableArray<Klass*>* secondaries, uintx& bitmap); static void hash_insert(Klass* klass, GrowableArray<Klass*>* secondaries, uintx& bitmap);
static uintx hash_secondary_supers(Array<Klass*>* secondaries, bool rewrite); static uintx hash_secondary_supers(Array<Klass*>* secondaries, bool rewrite);