gh-104584: Baby steps towards generating and executing traces (#105924)

Added a new, experimental, tracing optimizer and interpreter (a.k.a. "tier 2"). This currently pessimizes, so don't use yet -- this is infrastructure so we can experiment with optimizing passes. To enable it, pass ``-Xuops`` or set ``PYTHONUOPS=1``. To get debug output, set ``PYTHONUOPSDEBUG=N`` where ``N`` is a debug level (0-4, where 0 is no debug output and 4 is excessively verbose).

All of this code is likely to change dramatically before the 3.13 feature freeze. But this is a first step.

1 files changed, 9 insertions, 1 deletions

diff --git a/Python/ceval_macros.h b/Python/ceval_macros.h
index 706a9a2..0d41ef5 100644
--- a/Python/ceval_macros.h
+++ b/Python/ceval_macros.h
@@ -1,4 +1,4 @@
-// Macros needed by ceval.c and bytecodes.c
+// Macros and other things needed by ceval.c and bytecodes.c
 
 /* Computed GOTOs, or
        the-optimization-commonly-but-improperly-known-as-"threaded code"
@@ -339,3 +339,11 @@ do { \
         goto error; \
     } \
 } while (0);
+
+typedef PyObject *(*convertion_func_ptr)(PyObject *);
+
+static const convertion_func_ptr CONVERSION_FUNCTIONS[4] = {
+    [FVC_STR] = PyObject_Str,
+    [FVC_REPR] = PyObject_Repr,
+    [FVC_ASCII] = PyObject_ASCII
+};