gh-131296: fix clang-cl warning in tracemalloc.c

vstinner · vstinner · commit dc2567af182f · 2025-03-20T17:01:52.000+01:00
Change MAX_NFRAME type from 'unsigned long' to size_t. On Windows
64-bit, 'unsigned long' is only 32-bit, whereas size_t is 64-bit.
diff --git a/Python/tracemalloc.c b/Python/tracemalloc.c
@@ -51,7 +51,7 @@ typedef struct tracemalloc_traceback traceback_t;
 /* The maximum number of frames is either:
  - The maximum number of frames we can store in `traceback_t.nframe`
  - The maximum memory size_t we can allocate */
-static const unsigned long MAX_NFRAME = Py_MIN(UINT16_MAX, ((SIZE_MAX - sizeof(traceback_t)) / sizeof(frame_t) + 1));
+static const size_t MAX_NFRAME = Py_MIN(UINT16_MAX, ((SIZE_MAX - sizeof(traceback_t)) / sizeof(frame_t) + 1));
 
 
 #define tracemalloc_empty_traceback _PyRuntime.tracemalloc.empty_traceback
@@ -783,9 +783,9 @@ tracemalloc_deinit(void)
 int
 _PyTraceMalloc_Start(int max_nframe)
 {
-    if (max_nframe < 1 || (unsigned long) max_nframe > MAX_NFRAME) {
+    if (max_nframe < 1 || (size_t)max_nframe > MAX_NFRAME) {
         PyErr_Format(PyExc_ValueError,
-                     "the number of frames must be in range [1; %lu]",
+                     "the number of frames must be in range [1; %zu]",
                      MAX_NFRAME);
         return -1;
     }
