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libspl/assert: use libunwind for backtrace when available

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libunwind seems to do a better job of resolving a symbols than
backtrace(), and is also useful on platforms that don't have backtrace()
(eg musl). If it's available, use it.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://despairlabs.com/sponsor/
Closes #16140
This commit is contained in:
Rob Norris
2024-04-30 10:37:29 +10:00
committed by Tony Hutter
parent 21f66db674
commit 88686213c3
4 changed files with 79 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/libspl/Makefile.am
+2 -2
View File
@@ -1,6 +1,6 @@
include $(srcdir)/%D%/include/Makefile.am
libspl_assert_la_CFLAGS = $(AM_CFLAGS) $(LIBRARY_CFLAGS)
libspl_assert_la_CFLAGS = $(AM_CFLAGS) $(LIBRARY_CFLAGS) $(LIBUNWIND_CFLAGS)
libspl_la_CFLAGS = $(libspl_assert_la_CFLAGS)
noinst_LTLIBRARIES += libspl_assert.la libspl.la
@@ -44,4 +44,4 @@ libspl_la_LIBADD = \
libspl_la_LIBADD += $(LIBATOMIC_LIBS) $(LIBCLOCK_GETTIME)
libspl_assert_la_LIBADD = $(BACKTRACE_LIBS)
libspl_assert_la_LIBADD = $(BACKTRACE_LIBS) $(LIBUNWIND_LIBS)
lib/libspl/assert.c
+32 -1
View File
@@ -49,7 +49,38 @@
pthread_getname_np(pthread_self(), buf, len);
#endif
#if defined(HAVE_BACKTRACE)
#if defined(HAVE_LIBUNWIND)
#define UNW_LOCAL_ONLY
#include <libunwind.h>
static inline void
libspl_dump_backtrace(void)
{
unw_context_t uc;
unw_cursor_t cp;
unw_word_t ip, off;
char funcname[128];
#ifdef HAVE_LIBUNWIND_ELF
char objname[128];
unw_word_t objoff;
#endif
fprintf(stderr, "Call trace:\n");
unw_getcontext(&uc);
unw_init_local(&cp, &uc);
while (unw_step(&cp) > 0) {
unw_get_reg(&cp, UNW_REG_IP, &ip);
unw_get_proc_name(&cp, funcname, sizeof (funcname), &off);
#ifdef HAVE_LIBUNWIND_ELF
unw_get_elf_filename(&cp, objname, sizeof (objname), &objoff);
fprintf(stderr, " [0x%08lx] %s+0x%2lx (in %s +0x%2lx)\n",
ip, funcname, off, objname, objoff);
#else
fprintf(stderr, " [0x%08lx] %s+0x%2lx\n", ip, funcname, off);
#endif
}
}
#elif defined(HAVE_BACKTRACE)
#include <execinfo.h>
static inline void