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      1 //===---------------------- backtrace_test.cpp ----------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 #include <assert.h>
     10 #include <stddef.h>
     11 #include <unwind.h>
     12 
     13 extern "C" _Unwind_Reason_Code
     14 trace_function(struct _Unwind_Context* context, void* ntraced) {
     15   (*reinterpret_cast<size_t*>(ntraced))++;
     16   // We should never have a call stack this deep...
     17   assert(*reinterpret_cast<size_t*>(ntraced) < 20);
     18   return _URC_NO_REASON;
     19 }
     20 
     21 void call3_throw(size_t* ntraced) {
     22   try {
     23     _Unwind_Backtrace(trace_function, ntraced);
     24   } catch (...) {
     25     assert(false);
     26   }
     27 }
     28 
     29 void call3_nothrow(size_t* ntraced) {
     30   _Unwind_Backtrace(trace_function, ntraced);
     31 }
     32 
     33 void call2(size_t* ntraced, bool do_throw) {
     34   if (do_throw) {
     35     call3_throw(ntraced);
     36   } else {
     37     call3_nothrow(ntraced);
     38   }
     39 }
     40 
     41 void call1(size_t* ntraced, bool do_throw) {
     42   call2(ntraced, do_throw);
     43 }
     44 
     45 int main() {
     46   size_t throw_ntraced = 0;
     47   size_t nothrow_ntraced = 0;
     48 
     49   call1(&nothrow_ntraced, false);
     50 
     51   try {
     52     call1(&throw_ntraced, true);
     53   } catch (...) {
     54     assert(false);
     55   }
     56 
     57   // Different platforms (and different runtimes) will unwind a different number
     58   // of times, so we can't make any better assumptions than this.
     59   assert(nothrow_ntraced > 1);
     60   assert(throw_ntraced == nothrow_ntraced); // Make sure we unwind through catch
     61   return 0;
     62 }
     63