1 files changed, 29 insertions, 0 deletions
diff --git a/contrib/tools/python3/Include/internal/pycore_function.h b/contrib/tools/python3/Include/internal/pycore_function.h
index ecbb7001e7d..6d44e933e8a 100644
--- a/contrib/tools/python3/Include/internal/pycore_function.h
+++ b/contrib/tools/python3/Include/internal/pycore_function.h
@@ -4,19 +4,48 @@
 extern "C" {
 #endif
 
+#include "pycore_lock.h"
+
 #ifndef Py_BUILD_CORE
 #  error "this header requires Py_BUILD_CORE define"
 #endif
 
+extern PyObject* _PyFunction_Vectorcall(
+    PyObject *func,
+    PyObject *const *stack,
+    size_t nargsf,
+    PyObject *kwnames);
+
 #define FUNC_MAX_WATCHERS 8
 
+#define FUNC_VERSION_CACHE_SIZE (1<<12)  /* Must be a power of 2 */
+
+struct _func_version_cache_item {
+    PyFunctionObject *func;
+    PyObject *code;
+};
+
 struct _py_func_state {
+#ifdef Py_GIL_DISABLED
+    // Protects next_version
+    PyMutex mutex;
+#endif
+
     uint32_t next_version;
+    // Borrowed references to function and code objects whose
+    // func_version % FUNC_VERSION_CACHE_SIZE
+    // once was equal to the index in the table.
+    // They are cleared when the function or code object is deallocated.
+    struct _func_version_cache_item func_version_cache[FUNC_VERSION_CACHE_SIZE];
 };
 
 extern PyFunctionObject* _PyFunction_FromConstructor(PyFrameConstructor *constr);
 
 extern uint32_t _PyFunction_GetVersionForCurrentState(PyFunctionObject *func);
+PyAPI_FUNC(void) _PyFunction_SetVersion(PyFunctionObject *func, uint32_t version);
+void _PyFunction_ClearCodeByVersion(uint32_t version);
+PyFunctionObject *_PyFunction_LookupByVersion(uint32_t version, PyObject **p_code);
+
 extern PyObject *_Py_set_function_type_params(
     PyThreadState* unused, PyObject *func, PyObject *type_params);