Make GraalPyObject smaller; introduce field ob_size to GraalPyVarObject

Author: fangerer

graalpython/com.oracle.graal.python.cext/src/capi.h

@@ -113,12 +113,13 @@ typedef struct {
 } propertyobject;
 
 typedef struct {
-    PyObject_VAR_HEAD
+    PyObject_HEAD
     int32_t handle_table_index;
 } GraalPyObject;
 
 typedef struct {
     GraalPyObject ob_base;
+    Py_ssize_t ob_size;
     PyObject **ob_item;
 } GraalPyVarObject;
 

graalpython/com.oracle.graal.python.cext/src/object.c

@@ -867,7 +867,7 @@ Py_ssize_t PyTruffle_SIZE(PyObject *ob) {
          * PyVarObject in future.
          */
         if (ptr->ob_type == &PyTuple_Type) {
-            res = ((PyVarObject *) ptr)->ob_size;
+            res = ((GraalPyVarObject *) ptr)->ob_size;
 #ifndef NDEBUG
             if (PyTruffle_Debug_CAPI() && GraalPy_get_PyVarObject_ob_size(a) != res)
             {

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/structs/CFields.java

@@ -116,6 +116,7 @@ public enum CFields {
     PyVarObject__ob_size(Py_ssize_t),
 
     GraalPyObject__handle_table_index(Int),
+    GraalPyVarObject__ob_size(Py_ssize_t),
     GraalPyVarObject__ob_item(PyObjectPtr),
 
     PyModuleDef__m_name(ConstCharPtr),