Store class in rb_class_cc_entries

We need the class to not invalidate unrelated callcaches. By moving to a
VALUE object for the callcache table, we don't have access to the class
to which it belongs anymore, so we can store it here.

Author: etiennebarrie

vm_callinfo.h

@@ -563,6 +563,7 @@ struct rb_class_cc_entries {
     int capa;
     int len;
     const struct rb_callable_method_entry_struct *cme;
+    const VALUE klass; // for checking which CCs should be invalidated
     struct rb_class_cc_entries_entry {
         unsigned int argc;
         unsigned int flag;

vm_insnhelper.c

@@ -1990,6 +1990,7 @@ vm_ccs_create(VALUE klass, VALUE cc_tbl, ID mid, const rb_callable_method_entry_
 #endif
     ccs->capa = 0;
     ccs->len = 0;
+    *(VALUE *)&ccs->klass = klass;
     ccs->cme = cme;
     METHOD_ENTRY_CACHED_SET((rb_callable_method_entry_t *)cme);
     ccs->entries = NULL;
@@ -2018,6 +2019,7 @@ vm_ccs_push(VALUE klass, struct rb_class_cc_entries *ccs, const struct rb_callin
         }
     }
     VM_ASSERT(ccs->len < ccs->capa);
+    VM_ASSERT(ccs->klass == klass);
 
     const int pos = ccs->len++;
     ccs->entries[pos].argc = vm_ci_argc(ci);

vm_method.c

@@ -123,6 +123,7 @@ compact_cc_entry_i(VALUE ccs_ptr, void *data)
 
     ccs->cme = (const struct rb_callable_method_entry_struct *)rb_gc_location((VALUE)ccs->cme);
     VM_ASSERT(vm_ccs_p(ccs));
+    *(VALUE *)&ccs->klass = rb_gc_location(ccs->klass);
 
     for (int i=0; i<ccs->len; i++) {
         ccs->entries[i].cc = (const struct rb_callcache *)rb_gc_location((VALUE)ccs->entries[i].cc);