bpo-45340: Don't create object dictionaries unless actually needed (GH-28802)

* Never change types' cached keys. It could invalidate inline attribute objects.

* Lazily create object dictionaries.

* Update specialization of LOAD/STORE_ATTR.

* Don't update shared keys version for deletion of value.

* Update gdb support to handle instance values.

* Rename SPLIT_KEYS opcodes to INSTANCE_VALUE.

1 files changed, 11 insertions, 10 deletions

diff --git a/Include/opcode.h b/Include/opcode.h
index 8817a4d..15f7226 100644
--- a/Include/opcode.h
+++ b/Include/opcode.h
@@ -147,7 +147,7 @@ extern "C" {
 #define BINARY_SUBSCR_DICT       39
 #define JUMP_ABSOLUTE_QUICK      40
 #define LOAD_ATTR_ADAPTIVE       41
-#define LOAD_ATTR_SPLIT_KEYS     42
+#define LOAD_ATTR_INSTANCE_VALUE  42
 #define LOAD_ATTR_WITH_HINT      43
 #define LOAD_ATTR_SLOT           44
 #define LOAD_ATTR_MODULE         45
@@ -158,15 +158,16 @@ extern "C" {
 #define LOAD_METHOD_CACHED       80
 #define LOAD_METHOD_CLASS        81
 #define LOAD_METHOD_MODULE       87
-#define STORE_ATTR_ADAPTIVE      88
-#define STORE_ATTR_SPLIT_KEYS   120
-#define STORE_ATTR_SLOT         122
-#define STORE_ATTR_WITH_HINT    123
-#define LOAD_FAST__LOAD_FAST    127
-#define STORE_FAST__LOAD_FAST   128
-#define LOAD_FAST__LOAD_CONST   134
-#define LOAD_CONST__LOAD_FAST   140
-#define STORE_FAST__STORE_FAST  143
+#define LOAD_METHOD_NO_DICT      88
+#define STORE_ATTR_ADAPTIVE     120
+#define STORE_ATTR_INSTANCE_VALUE 122
+#define STORE_ATTR_SLOT         123
+#define STORE_ATTR_WITH_HINT    127
+#define LOAD_FAST__LOAD_FAST    128
+#define STORE_FAST__LOAD_FAST   134
+#define LOAD_FAST__LOAD_CONST   140
+#define LOAD_CONST__LOAD_FAST   143
+#define STORE_FAST__STORE_FAST  149
 #define DO_TRACING              255
 #ifdef NEED_OPCODE_JUMP_TABLES
 static uint32_t _PyOpcode_RelativeJump[8] = {