map cells to arg slots at code creation time (closes #12399)
This removes nested loops in PyEval_EvalCodeEx.
diff --git a/Include/code.h b/Include/code.h
index e773b6a..7c7e5bf 100644
--- a/Include/code.h
+++ b/Include/code.h
@@ -22,6 +22,7 @@
PyObject *co_freevars; /* tuple of strings (free variable names) */
PyObject *co_cellvars; /* tuple of strings (cell variable names) */
/* The rest doesn't count for hash or comparisons */
+ unsigned char *co_cell2arg; /* Maps cell vars which are arguments. */
PyObject *co_filename; /* unicode (where it was loaded from) */
PyObject *co_name; /* unicode (name, for reference) */
int co_firstlineno; /* first source line number */
@@ -57,6 +58,11 @@
#define CO_FUTURE_BARRY_AS_BDFL 0x40000
+/* This value is found in the co_cell2arg array when the associated cell
+ variable does not correspond to an argument. The maximum number of
+ arguments is 255 (indexed up to 254), so 255 work as a special flag.*/
+#define CO_CELL_NOT_AN_ARG 255
+
/* This should be defined if a future statement modifies the syntax.
For example, when a keyword is added.
*/