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150
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1 //===---------------------- backtrace_test.cpp ----------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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173
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9 // UNSUPPORTED: no-exceptions
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150
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10
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11 #include <assert.h>
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12 #include <stddef.h>
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13 #include <unwind.h>
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14
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15 extern "C" _Unwind_Reason_Code
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16 trace_function(struct _Unwind_Context*, void* ntraced) {
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17 (*reinterpret_cast<size_t*>(ntraced))++;
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18 // We should never have a call stack this deep...
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19 assert(*reinterpret_cast<size_t*>(ntraced) < 20);
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20 return _URC_NO_REASON;
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21 }
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22
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23 __attribute__ ((__noinline__))
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24 void call3_throw(size_t* ntraced) {
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25 try {
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26 _Unwind_Backtrace(trace_function, ntraced);
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27 } catch (...) {
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28 assert(false);
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29 }
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30 }
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31
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32 __attribute__ ((__noinline__, __disable_tail_calls__))
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33 void call3_nothrow(size_t* ntraced) {
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34 _Unwind_Backtrace(trace_function, ntraced);
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35 }
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36
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37 __attribute__ ((__noinline__, __disable_tail_calls__))
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38 void call2(size_t* ntraced, bool do_throw) {
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39 if (do_throw) {
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40 call3_throw(ntraced);
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41 } else {
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42 call3_nothrow(ntraced);
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43 }
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44 }
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45
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46 __attribute__ ((__noinline__, __disable_tail_calls__))
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47 void call1(size_t* ntraced, bool do_throw) {
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48 call2(ntraced, do_throw);
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49 }
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50
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51 int main() {
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52 size_t throw_ntraced = 0;
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53 size_t nothrow_ntraced = 0;
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54
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55 call1(¬hrow_ntraced, false);
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56
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57 try {
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58 call1(&throw_ntraced, true);
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59 } catch (...) {
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60 assert(false);
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61 }
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62
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63 // Different platforms (and different runtimes) will unwind a different number
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64 // of times, so we can't make any better assumptions than this.
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65 assert(nothrow_ntraced > 1);
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66 assert(throw_ntraced == nothrow_ntraced); // Make sure we unwind through catch
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67 return 0;
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68 }
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