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gh-127635: Use flexible array in tracemalloc (#141991)

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Replace frames[1] with frames[] in tracemalloc_traceback structure.
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Victor Stinner 2025-11-27 12:32:31 +01:00 • committed by GitHub
parent 7fe1a18b77
commit 83d8134c5b
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2 changed files with 30 additions and 16 deletions
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26
Python/tracemalloc.c
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@ -46,7 +46,7 @@ typedef struct tracemalloc_frame frame_t;
typedef struct tracemalloc_traceback traceback_t;
#define TRACEBACK_SIZE(NFRAME) \
(sizeof(traceback_t) + sizeof(frame_t) * (NFRAME - 1))
(sizeof(traceback_t) + sizeof(frame_t) * (NFRAME))
static const int MAX_NFRAME = UINT16_MAX;
@ -329,8 +329,9 @@ traceback_new(void)
traceback->nframe = 0;
traceback->total_nframe = 0;
traceback_get_frames(traceback);
if (traceback->nframe == 0)
return &tracemalloc_empty_traceback;
if (traceback->nframe == 0) {
return tracemalloc_empty_traceback;
}
traceback->hash = traceback_hash(traceback);
/* intern the traceback */
@ -754,12 +755,18 @@ _PyTraceMalloc_Init(void)
return _PyStatus_NO_MEMORY();
}
tracemalloc_empty_traceback.nframe = 1;
tracemalloc_empty_traceback.total_nframe = 1;
assert(tracemalloc_empty_traceback == NULL);
tracemalloc_empty_traceback = raw_malloc(TRACEBACK_SIZE(1));
if (tracemalloc_empty_traceback == NULL) {
return _PyStatus_NO_MEMORY();
}
tracemalloc_empty_traceback->nframe = 1;
tracemalloc_empty_traceback->total_nframe = 1;
/* borrowed reference */
tracemalloc_empty_traceback.frames[0].filename = &_Py_STR(anon_unknown);
tracemalloc_empty_traceback.frames[0].lineno = 0;
tracemalloc_empty_traceback.hash = traceback_hash(&tracemalloc_empty_traceback);
tracemalloc_empty_traceback->frames[0].filename = &_Py_STR(anon_unknown);
tracemalloc_empty_traceback->frames[0].lineno = 0;
tracemalloc_empty_traceback->hash = traceback_hash(tracemalloc_empty_traceback);
tracemalloc_config.initialized = TRACEMALLOC_INITIALIZED;
return _PyStatus_OK();
@ -782,6 +789,9 @@ tracemalloc_deinit(void)
_Py_hashtable_destroy(tracemalloc_filenames);
PyThread_tss_delete(&tracemalloc_reentrant_key);
raw_free(tracemalloc_empty_traceback);
tracemalloc_empty_traceback = NULL;
}