gh-91053: Add an optional callback that is invoked whenever a function is modified (#98175)

1 files changed, 6 insertions, 0 deletions

diff --git a/Include/internal/pycore_interp.h b/Include/internal/pycore_interp.h
index 437bf74b77..532b284990 100644
--- a/Include/internal/pycore_interp.h
+++ b/Include/internal/pycore_interp.h
@@ -17,6 +17,7 @@ extern "C" {
 #include "pycore_dict_state.h"    // struct _Py_dict_state
 #include "pycore_exceptions.h"    // struct _Py_exc_state
 #include "pycore_floatobject.h"   // struct _Py_float_state
+#include "pycore_function.h"      // FUNC_MAX_WATCHERS
 #include "pycore_genobject.h"     // struct _Py_async_gen_state
 #include "pycore_gc.h"            // struct _gc_runtime_state
 #include "pycore_list.h"          // struct _Py_list_state
@@ -171,6 +172,11 @@ struct _is {
     // Initialized to _PyEval_EvalFrameDefault().
     _PyFrameEvalFunction eval_frame;
 
+    PyDict_WatchCallback dict_watchers[DICT_MAX_WATCHERS];
+    PyFunction_WatchCallback func_watchers[FUNC_MAX_WATCHERS];
+    // One bit is set for each non-NULL entry in func_watchers
+    uint8_t active_func_watchers;
+
     Py_ssize_t co_extra_user_count;
     freefunc co_extra_freefuncs[MAX_CO_EXTRA_USERS];