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
trace_function(struct _Unwind_Context * context,void * ntraced)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
call3_throw(size_t * ntraced)21 void call3_throw(size_t* ntraced) {
22 try {
23 _Unwind_Backtrace(trace_function, ntraced);
24 } catch (...) {
25 assert(false);
26 }
27 }
28
call3_nothrow(size_t * ntraced)29 void call3_nothrow(size_t* ntraced) {
30 _Unwind_Backtrace(trace_function, ntraced);
31 }
32
call2(size_t * ntraced,bool do_throw)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
call1(size_t * ntraced,bool do_throw)41 void call1(size_t* ntraced, bool do_throw) {
42 call2(ntraced, do_throw);
43 }
44
main()45 int main() {
46 size_t throw_ntraced = 0;
47 size_t nothrow_ntraced = 0;
48
49 call1(¬hrow_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