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libbacktrace: better backtrace_print when no debug info

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Fixes https://github.com/ianlancetaylor/libbacktrace/issues/59

	* print.c (print_syminfo_callback): New static function.
	(print_callback): Call backtrace_syminfo if there is no function
	or file name.
This commit is contained in:
Ian Lance Taylor 2024-07-17 17:36:25 -07:00
parent a922de0a7a
commit 30875fa698
1 changed files with 41 additions and 16 deletions
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57
libbacktrace/print.c
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@ -47,22 +47,6 @@ struct print_data
FILE *f;
};
/* Print one level of a backtrace. */
static int
print_callback (void *data, uintptr_t pc, const char *filename, int lineno,
const char *function)
{
struct print_data *pdata = (struct print_data *) data;
fprintf (pdata->f, "0x%lx %s\n\t%s:%d\n",
(unsigned long) pc,
function == NULL ? "???" : function,
filename == NULL ? "???" : filename,
lineno);
return 0;
}
/* Print errors to stderr. */
static void
@ -78,6 +62,47 @@ error_callback (void *data, const char *msg, int errnum)
fputc ('\n', stderr);
}
/* Print one level of a backtrace if we couldn't get a file or function name.
Use syminfo to try to get a symbol name. */
static void print_syminfo_callback (void *data, uintptr_t pc,
const char *symname, uintptr_t symval,
uintptr_t symsize ATTRIBUTE_UNUSED)
{
struct print_data *pdata = (struct print_data *) data;
if (symname == NULL)
fprintf (pdata->f, "0x%lx ???\n\t???:0\n", (unsigned long) pc);
else
fprintf (pdata->f, "0x%lx ???\n\t%s+0x%lx:0\n",
(unsigned long) pc,
symname,
pc - symval);
}
/* Print one level of a backtrace. */
static int
print_callback (void *data, uintptr_t pc, const char *filename, int lineno,
const char *function)
{
struct print_data *pdata = (struct print_data *) data;
if (function == NULL && filename == NULL)
{
backtrace_syminfo (pdata->state, pc, print_syminfo_callback,
error_callback, data);
return 0;
}
fprintf (pdata->f, "0x%lx %s\n\t%s:%d\n",
(unsigned long) pc,
function == NULL ? "???" : function,
filename == NULL ? "???" : filename,
lineno);
return 0;
}
/* Print a backtrace. */
void __attribute__((noinline))