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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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20
Include/internal/pycore_tracemalloc.h
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@ -30,8 +30,8 @@ struct _PyTraceMalloc_Config {
};
/* Pack the frame_t structure to reduce the memory footprint on 64-bit
architectures: 12 bytes instead of 16. */
/* Pack the tracemalloc_frame and tracemalloc_traceback structures to reduce
the memory footprint on 64-bit architectures: 12 bytes instead of 16. */
#if defined(_MSC_VER)
#pragma pack(push, 4)
#endif
@ -46,18 +46,22 @@ tracemalloc_frame {
PyObject *filename;
unsigned int lineno;
};
#ifdef _MSC_VER
#pragma pack(pop)
#endif
struct tracemalloc_traceback {
struct
#ifdef __GNUC__
__attribute__((packed))
#endif
tracemalloc_traceback {
Py_uhash_t hash;
/* Number of frames stored */
uint16_t nframe;
/* Total number of frames the traceback had */
uint16_t total_nframe;
struct tracemalloc_frame frames[1];
struct tracemalloc_frame frames[];
};
#ifdef _MSC_VER
#pragma pack(pop)
#endif
struct _tracemalloc_runtime_state {
@ -95,7 +99,7 @@ struct _tracemalloc_runtime_state {
Protected by TABLES_LOCK(). */
_Py_hashtable_t *domains;
struct tracemalloc_traceback empty_traceback;
struct tracemalloc_traceback *empty_traceback;
Py_tss_t reentrant_key;
};