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1 #include <libunwind.h>
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2 #include <stdlib.h>
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3
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4 void backtrace(int lower_bound) {
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5 unw_context_t context;
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6 unw_getcontext(&context);
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7
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8 unw_cursor_t cursor;
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9 unw_init_local(&cursor, &context);
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10
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11 int n = 0;
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12 do {
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13 ++n;
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14 if (n > 100) {
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15 abort();
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16 }
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17 } while (unw_step(&cursor) > 0);
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18
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19 if (n < lower_bound) {
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20 abort();
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21 }
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22 }
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23
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24 void test1(int i) {
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25 backtrace(i);
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26 }
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27
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28 void test2(int i, int j) {
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29 backtrace(i);
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30 test1(j);
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31 }
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32
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33 void test3(int i, int j, int k) {
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34 backtrace(i);
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35 test2(j, k);
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36 }
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37
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38 void test_no_info() {
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39 unw_context_t context;
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40 unw_getcontext(&context);
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41
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42 unw_cursor_t cursor;
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43 unw_init_local(&cursor, &context);
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44
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45 unw_proc_info_t info;
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46 int ret = unw_get_proc_info(&cursor, &info);
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47 if (ret != UNW_ESUCCESS)
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48 abort();
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49
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50 // Set the IP to an address clearly outside any function.
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51 unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)0);
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52
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53 ret = unw_get_proc_info(&cursor, &info);
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54 if (ret != UNW_ENOINFO)
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55 abort();
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56 }
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57
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58 int main() {
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59 test1(1);
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60 test2(1, 2);
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61 test3(1, 2, 3);
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62 test_no_info();
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63 }
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