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#include <libunwind.h>
#include <stdlib.h>
void backtrace(int lower_bound) {
unw_context_t context;
unw_getcontext(&context);
unw_cursor_t cursor;
unw_init_local(&cursor, &context);
int n = 0;
do {
++n;
if (n > 100) {
abort();
}
} while (unw_step(&cursor) > 0);
if (n < lower_bound) {
abort();
}
}
void test1(int i) {
backtrace(i);
}
void test2(int i, int j) {
backtrace(i);
test1(j);
}
void test3(int i, int j, int k) {
backtrace(i);
test2(j, k);
}
void test_no_info() {
unw_context_t context;
unw_getcontext(&context);
unw_cursor_t cursor;
unw_init_local(&cursor, &context);
unw_proc_info_t info;
int ret = unw_get_proc_info(&cursor, &info);
if (ret != UNW_ESUCCESS)
abort();
// Set the IP to an address clearly outside any function.
unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)&context);
ret = unw_get_proc_info(&cursor, &info);
if (ret != UNW_ENOINFO)
abort();
}
int main() {
test1(1);
test2(1, 2);
test3(1, 2, 3);
test_no_info();
}
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