PyStats: Make sure that the failure_kinds array is big enough. (python#133245)

Author: markshannon

Include/cpython/pystats.h

@@ -31,7 +31,7 @@
 
 #define PYSTATS_MAX_UOP_ID 512
 
-#define SPECIALIZATION_FAILURE_KINDS 50
+#define SPECIALIZATION_FAILURE_KINDS 60
 
 /* Stats for determining who is calling PyEval_EvalFrame */
 #define EVAL_CALL_TOTAL 0

Python/specialize.c

@@ -440,7 +440,9 @@ _Py_PrintSpecializationStats(int to_file)
 #define SPECIALIZATION_FAIL(opcode, kind) \
 do { \
     if (_Py_stats) { \
-        _Py_stats->opcode_stats[opcode].specialization.failure_kinds[kind]++; \
+        int _kind = (kind); \
+        assert(_kind < SPECIALIZATION_FAILURE_KINDS); \
+        _Py_stats->opcode_stats[opcode].specialization.failure_kinds[_kind]++; \
     } \
 } while (0)