bpo-44338: Port LOAD_GLOBAL to PEP 659 adaptive interpreter (GH-26638)

* Add specializations of LOAD_GLOBAL.

* Add more stats.

* Remove old opcache; it is no longer used.

* Add NEWS

1 files changed, 6 insertions, 68 deletions

diff --git a/Objects/codeobject.c b/Objects/codeobject.c
index 701a37d739..e054c43a1c 100644
--- a/Objects/codeobject.c
+++ b/Objects/codeobject.c
@@ -350,10 +350,7 @@ init_code(PyCodeObject *co, struct _PyCodeConstructor *con)
     /* not set */
     co->co_weakreflist = NULL;
     co->co_extra = NULL;
-    co->co_opcache_map = NULL;
-    co->co_opcache = NULL;
-    co->co_opcache_flag = 0;
-    co->co_opcache_size = 0;
+
     co->co_warmup = QUICKENING_INITIAL_WARMUP_VALUE;
     co->co_quickened = NULL;
 }
@@ -912,55 +909,6 @@ new_linesiterator(PyCodeObject *code)
     return li;
 }
 
-
-/******************
- * the opcache
- ******************/
-
-int
-_PyCode_InitOpcache(PyCodeObject *co)
-{
-    Py_ssize_t co_size = PyBytes_Size(co->co_code) / sizeof(_Py_CODEUNIT);
-    co->co_opcache_map = (unsigned char *)PyMem_Calloc(co_size, 1);
-    if (co->co_opcache_map == NULL) {
-        return -1;
-    }
-
-    const _Py_CODEUNIT *opcodes = (const _Py_CODEUNIT*)PyBytes_AS_STRING(co->co_code);
-    Py_ssize_t opts = 0;
-
-    for (Py_ssize_t i = 0; i < co_size;) {
-        unsigned char opcode = _Py_OPCODE(opcodes[i]);
-        i++;  // 'i' is now aligned to (next_instr - first_instr)
-
-        // TODO: LOAD_METHOD
-        if (opcode == LOAD_GLOBAL || opcode == LOAD_ATTR) {
-            opts++;
-            co->co_opcache_map[i] = (unsigned char)opts;
-            if (opts > 254) {
-                break;
-            }
-        }
-    }
-
-    if (opts) {
-        co->co_opcache = (_PyOpcache *)PyMem_Calloc(opts, sizeof(_PyOpcache));
-        if (co->co_opcache == NULL) {
-            PyMem_Free(co->co_opcache_map);
-            return -1;
-        }
-    }
-    else {
-        PyMem_Free(co->co_opcache_map);
-        co->co_opcache_map = NULL;
-        co->co_opcache = NULL;
-    }
-
-    co->co_opcache_size = (unsigned char)opts;
-    return 0;
-}
-
-
 /******************
  * "extra" frame eval info (see PEP 523)
  ******************/
@@ -1207,15 +1155,6 @@ code_new_impl(PyTypeObject *type, int argcount, int posonlyargcount,
 static void
 code_dealloc(PyCodeObject *co)
 {
-    if (co->co_opcache != NULL) {
-        PyMem_Free(co->co_opcache);
-    }
-    if (co->co_opcache_map != NULL) {
-        PyMem_Free(co->co_opcache_map);
-    }
-    co->co_opcache_flag = 0;
-    co->co_opcache_size = 0;
-
     if (co->co_extra != NULL) {
         PyInterpreterState *interp = _PyInterpreterState_GET();
         _PyCodeObjectExtra *co_extra = co->co_extra;
@@ -1442,12 +1381,11 @@ code_sizeof(PyCodeObject *co, PyObject *Py_UNUSED(args))
         res += co->co_ncellvars * sizeof(Py_ssize_t);
     }
 
-    if (co->co_opcache != NULL) {
-        assert(co->co_opcache_map != NULL);
-        // co_opcache_map
-        res += PyBytes_GET_SIZE(co->co_code) / sizeof(_Py_CODEUNIT);
-        // co_opcache
-        res += co->co_opcache_size * sizeof(_PyOpcache);
+    if (co->co_quickened != NULL) {
+        Py_ssize_t count = co->co_quickened[0].entry.zero.cache_count;
+        count += (PyBytes_GET_SIZE(co->co_code)+sizeof(SpecializedCacheEntry)-1)/
+            sizeof(SpecializedCacheEntry);
+        res += count * sizeof(SpecializedCacheEntry);
     }
 
     return PyLong_FromSsize_t(res);