sync RClass::ext::iv_index_tbl

iv_index_tbl manages instance variable indexes (ID -> index).
This data structure should be synchronized with other ractors
so introduce some VM locks.

This patch also introduced atomic ivar cache used by
set/getinlinecache instructions. To make updating ivar cache (IVC),
we changed iv_index_tbl data structure to manage (ID -> entry)
and an entry points serial and index. IVC points to this entry so
that cache update becomes atomically.

1 files changed, 15 insertions, 0 deletions

diff --git a/iseq.c b/iseq.c
index 05a77c8ed6..2f10cd6223 100644
--- a/iseq.c
+++ b/iseq.c
@@ -23,6 +23,7 @@
 #include "id_table.h"
 #include "internal.h"
 #include "internal/bits.h"
+#include "internal/class.h"
 #include "internal/compile.h"
 #include "internal/error.h"
 #include "internal/file.h"
@@ -180,6 +181,20 @@ iseq_extract_values(VALUE *code, size_t pos, iseq_value_itr_t * func, void *data
               }
             }
             break;
+          case TS_IVC:
+            {
+                IVC ivc = (IVC)code[pos + op_no + 1];
+                if (ivc->entry) {
+                    if (RB_TYPE_P(ivc->entry->class_value, T_NONE)) {
+                        rb_bug("!! %u", ivc->entry->index);
+                    }
+                    VALUE nv = func(data, ivc->entry->class_value);
+                    if (ivc->entry->class_value != nv) {
+                        ivc->entry->class_value = nv;
+                    }
+                }
+            }
+            break;
           case TS_ISE:
             {
               union iseq_inline_storage_entry *const is = (union iseq_inline_storage_entry *)code[pos + op_no + 1];