Introduce disposable call-cache.

This patch contains several ideas:

(1) Disposable inline method cache (IMC) for race-free inline method cache
    * Making call-cache (CC) as a RVALUE (GC target object) and allocate new
      CC on cache miss.
    * This technique allows race-free access from parallel processing
      elements like RCU.
(2) Introduce per-Class method cache (pCMC)
    * Instead of fixed-size global method cache (GMC), pCMC allows flexible
      cache size.
    * Caching CCs reduces CC allocation and allow sharing CC's fast-path
      between same call-info (CI) call-sites.
(3) Invalidate an inline method cache by invalidating corresponding method
    entries (MEs)
    * Instead of using class serials, we set "invalidated" flag for method
      entry itself to represent cache invalidation.
    * Compare with using class serials, the impact of method modification
      (add/overwrite/delete) is small.
    * Updating class serials invalidate all method caches of the class and
      sub-classes.
    * Proposed approach only invalidate the method cache of only one ME.

See [Feature #16614] for more details.

1 files changed, 1 insertions, 2 deletions

diff --git a/vm_core.h b/vm_core.h
index fb63c1c119..d84e05d99b 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -253,7 +253,6 @@ struct rb_calling_info {
 };
 
 struct rb_execution_context_struct;
-typedef VALUE (*vm_call_handler)(struct rb_execution_context_struct *ec, struct rb_control_frame_struct *cfp, struct rb_calling_info *calling, struct rb_call_data *cd);
 
 #if 1
 #define CoreDataFromValue(obj, type) (type*)DATA_PTR(obj)
@@ -1088,7 +1087,7 @@ typedef struct iseq_inline_cache_entry *IC;
 typedef struct iseq_inline_iv_cache_entry *IVC;
 typedef union iseq_inline_storage_entry *ISE;
 typedef const struct rb_callinfo *CALL_INFO;
-typedef struct rb_call_cache *CALL_CACHE;
+typedef const struct rb_callcache *CALL_CACHE;
 typedef struct rb_call_data *CALL_DATA;
 
 typedef VALUE CDHASH;