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gh-127604: Allow faulthandler to dumpC stack on MacOS #132841

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Merged
merged 2 commits into from
Apr 23, 2025
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gh-127604: Allow faulthandler to dumpC stack on MacOS #132841

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gh-127604: Allow faulthandler to dumpC stack on MacOS
pablogsal Apr 23, 2025
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pablogsal Apr 23, 2025
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23 changes: 20 additions & 3 deletions Python/traceback.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,11 +18,24 @@
#ifdef HAVE_UNISTD_H
# include <unistd.h> // lseek()
#endif
#if defined(HAVE_EXECINFO_H) && defined(HAVE_DLFCN_H) && defined(HAVE_LINK_H)

#if (defined(HAVE_EXECINFO_H) && defined(HAVE_DLFCN_H) && defined(HAVE_LINK_H))
# define _PY_HAS_BACKTRACE_HEADERS 1
#endif

#if (defined(__APPLE__) && defined(HAVE_EXECINFO_H) && defined(HAVE_DLFCN_H))
# define _PY_HAS_BACKTRACE_HEADERS 1
#endif

#ifdef _PY_HAS_BACKTRACE_HEADERS
# include <execinfo.h> // backtrace(), backtrace_symbols()
# include <dlfcn.h> // dladdr1()
# include <link.h> // struct DL_info
# if defined(HAVE_BACKTRACE) && defined(HAVE_BACKTRACE_SYMBOLS) && defined(HAVE_DLADDR1)
#ifdef HAVE_LINK_H
# include <link.h> // struct DL_info
#endif
# if defined(__APPLE__) && defined(HAVE_BACKTRACE) && defined(HAVE_BACKTRACE_SYMBOLS) && defined(HAVE_DLADDR)
# define CAN_C_BACKTRACE
# elif defined(HAVE_BACKTRACE) && defined(HAVE_BACKTRACE_SYMBOLS) && defined(HAVE_DLADDR1)
# define CAN_C_BACKTRACE
# endif
#endif
Expand Down Expand Up @@ -1193,6 +1206,9 @@ _Py_backtrace_symbols_fd(int fd, void *const *array, Py_ssize_t size)
VLA(int, status, size);
/* Fill in the information we can get from dladdr() */
for (Py_ssize_t i = 0; i < size; ++i) {
#ifdef __APPLE__
status[i] = dladdr(array[i], &info[i]);
#else
struct link_map *map;
status[i] = dladdr1(array[i], &info[i], (void **)&map, RTLD_DL_LINKMAP);
if (status[i] != 0
Expand All @@ -1204,6 +1220,7 @@ _Py_backtrace_symbols_fd(int fd, void *const *array, Py_ssize_t size)
something we want to subtract out */
info[i].dli_fbase = (void *) map->l_addr;
}
#endif
}
for (Py_ssize_t i = 0; i < size; ++i) {
if (status[i] == 0
Expand Down
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