Sync pre-release CPython main branch from GitHub (2026-05-05)

Summary:
Imported python/cpython `3.15.0a8+` from upstream rev [`5dd2161`](https://www.github.com/python/cpython/commit/5dd21617164cf69e848a70e3d7e32faf0bc3f279) (committed 2026-05-05 03:30:03+00:00).

# Commit Info

Base: (`3.15.0a8+`) - [`7acee98`](https://www.github.com/python/cpython/commit/7acee984e8e2a88bcfb7a83e9c472902e340e5be) (commit date: 2026-05-04 21:38:07+00:00)
Imported: (`3.15.0a8+`) - [`5dd2161`](https://www.github.com/python/cpython/commit/5dd21617164cf69e848a70e3d7e32faf0bc3f279) (commit date: 2026-05-05 03:30:03+00:00)

# Noteworthy file changes

- Stdlib files (1 added)
- Test files (3 removed)
- Low-signal files (10 added) (NEWS.d, docs, .github)

Complete list of added/removed files: https://www.internalfb.com/intern/everpaste/?color=0&handle=GGlp_h7ZdaLfBB0GAK_KiUQZRq0lbr0LAAAz

Differential Revision: D103793452

fbshipit-source-id: 49e143ad692be104f37c23071443b45e6fe1ea14

Author: generatedunixname1734921407115435

cinderx/Interpreter/3.15/Includes/Python/ceval_macros.h

@@ -328,11 +328,24 @@ GETITEM(PyObject *v, Py_ssize_t i) {
 #define CONSTS() _PyFrame_GetCode(frame)->co_consts
 #define NAMES() _PyFrame_GetCode(frame)->co_names
 
+#if defined(WITH_DTRACE) && !defined(Py_BUILD_CORE_MODULE)
+static void dtrace_function_entry(_PyInterpreterFrame *);
+static void dtrace_function_return(_PyInterpreterFrame *);
+
 #define DTRACE_FUNCTION_ENTRY()  \
     if (PyDTrace_FUNCTION_ENTRY_ENABLED()) { \
         dtrace_function_entry(frame); \
     }
 
+#define DTRACE_FUNCTION_RETURN() \
+    if (PyDTrace_FUNCTION_RETURN_ENABLED()) { \
+        dtrace_function_return(frame); \
+    }
+#else
+#define DTRACE_FUNCTION_ENTRY() ((void)0)
+#define DTRACE_FUNCTION_RETURN() ((void)0)
+#endif
+
 /* This takes a uint16_t instead of a _Py_BackoffCounter,
  * because it is used directly on the cache entry in generated code,
  * which is always an integral type. */

cinderx/Interpreter/3.15/Includes/generated_cases.c.h

@@ -9335,6 +9335,7 @@
                 ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
                 _PyFrame_SetStackPointer(frame, stack_pointer);
                 assert(STACK_LEVEL() == 0);
+                DTRACE_FUNCTION_RETURN();
                 _Py_LeaveRecursiveCallPy(tstate);
                 _PyInterpreterFrame *dying = frame;
                 frame = tstate->current_frame = dying->previous;
@@ -9397,6 +9398,7 @@
                 stack_pointer += -1;
                 ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
                 _PyFrame_SetStackPointer(frame, stack_pointer);
+                DTRACE_FUNCTION_RETURN();
                 tstate->exc_info = gen->gi_exc_state.previous_item;
                 gen->gi_exc_state.previous_item = NULL;
                 _Py_LeaveRecursiveCallPy(tstate);
@@ -12534,6 +12536,7 @@
                 ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
                 _PyFrame_SetStackPointer(frame, stack_pointer);
                 assert(STACK_LEVEL() == 0);
+                DTRACE_FUNCTION_RETURN();
                 _Py_LeaveRecursiveCallPy(tstate);
                 _PyInterpreterFrame *dying = frame;
                 frame = tstate->current_frame = dying->previous;
@@ -14418,6 +14421,7 @@
                 stack_pointer += -1;
                 ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
                 _PyFrame_SetStackPointer(frame, stack_pointer);
+                DTRACE_FUNCTION_RETURN();
                 tstate->exc_info = gen->gi_exc_state.previous_item;
                 gen->gi_exc_state.previous_item = NULL;
                 _Py_LeaveRecursiveCallPy(tstate);
@@ -14564,6 +14568,13 @@ JUMP_TO_LABEL(error);
         }
 
         LABEL(exit_unwind)
+        {
+            assert(_PyErr_Occurred(tstate));
+            DTRACE_FUNCTION_RETURN();
+            JUMP_TO_LABEL(exit_unwind_notrace);
+        }
+
+        LABEL(exit_unwind_notrace)
         {
             assert(_PyErr_Occurred(tstate));
             _Py_LeaveRecursiveCallPy(tstate);

cinderx/Interpreter/3.15/cinderx_opcode_targets.h

@@ -527,6 +527,7 @@ static PyObject *Py_PRESERVE_NONE_CC _TAIL_CALL_pop_1_error(TAIL_CALL_PARAMS);
 static PyObject *Py_PRESERVE_NONE_CC _TAIL_CALL_error(TAIL_CALL_PARAMS);
 static PyObject *Py_PRESERVE_NONE_CC _TAIL_CALL_exception_unwind(TAIL_CALL_PARAMS);
 static PyObject *Py_PRESERVE_NONE_CC _TAIL_CALL_exit_unwind(TAIL_CALL_PARAMS);
+static PyObject *Py_PRESERVE_NONE_CC _TAIL_CALL_exit_unwind_notrace(TAIL_CALL_PARAMS);
 static PyObject *Py_PRESERVE_NONE_CC _TAIL_CALL_start_frame(TAIL_CALL_PARAMS);
 static PyObject *Py_PRESERVE_NONE_CC _TAIL_CALL_stop_tracing(TAIL_CALL_PARAMS);