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backtrace: Add backtrace_str() for condensed backtrace output

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Add a new function backtrace_str() that returns a condensed backtrace
string containing function names and line numbers separated by " <-".

For example: "func_a:123 <-func_b:456 <-func_c:789"

This is useful for logging and debugging where a compact representation
of the call stack is needed. The depth is controlled by the new
CONFIG_BACKTRACE_DEPTH option (default 3).

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
This commit is contained in:
Simon Glass
2025-12-02 04:57:41 +00:00
parent e1e95b2887
commit 0cf38dc8c8
4 changed files with 203 additions and 0 deletions
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36
test/lib/backtrace.c
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@@ -46,3 +46,39 @@ static int lib_test_backtrace(struct unit_test_state *uts)
return 0;
}
LIB_TEST(lib_test_backtrace, 0);
/* Test backtrace_strf() and backtrace_str() */
static int lib_test_backtrace_str(struct unit_test_state *uts)
{
char pattern[128];
char buf[256];
const char *cstr;
char *str;
int line;
/* Test backtrace_strf() with skip=1 to skip backtrace_strf() itself */
line = __LINE__ + 1;
str = backtrace_strf(1, buf, sizeof(buf));
ut_assertnonnull(str);
ut_asserteq_ptr(buf, str);
printf("backtrace_strf: %s\n", str);
snprintf(pattern, sizeof(pattern),
"lib_test_backtrace_str:%d <-ut_run_test:\\d+ <-ut_run_test_live_flat:\\d+",
line);
ut_asserteq_regex(pattern, str);
/* Test backtrace_str() */
line = __LINE__ + 1;
cstr = backtrace_str(0);
ut_assertnonnull(cstr);
printf("backtrace_str: %s\n", cstr);
snprintf(pattern, sizeof(pattern),
"lib_test_backtrace_str:%d <-ut_run_test:\\d+ <-ut_run_test_live_flat:\\d+",
line);
ut_asserteq_regex(pattern, cstr);
return 0;
}
LIB_TEST(lib_test_backtrace_str, 0);