libunwind/test/libunwind_02.pass.cpp

   1 // -*- C++ -*-
   2 //===----------------------------------------------------------------------===//
   3 //
   4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 // See https://llvm.org/LICENSE.txt for license information.
   6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // TODO: Figure out why this fails with Memory Sanitizer.
  11 // XFAIL: msan
  12
  13 #undef NDEBUG
  14 #include <assert.h>
  15 #include <stdlib.h>
  16 #include <unwind.h>
  17
  18 #define EXPECTED_NUM_FRAMES 50
  19 #define NUM_FRAMES_UPPER_BOUND 100
  20
  21 _Unwind_Reason_Code callback(_Unwind_Context *context, void *cnt) {
  22   (void)context;
  23   int *i = (int *)cnt;
  24   ++*i;
  25   if (*i > NUM_FRAMES_UPPER_BOUND) {
  26     abort();
  27   }
  28   return _URC_NO_REASON;
  29 }
  30
  31 void test_backtrace() {
  32   int n = 0;
  33   _Unwind_Backtrace(&callback, &n);
  34   if (n < EXPECTED_NUM_FRAMES) {
  35     abort();
  36   }
  37 }
  38
  39 int test(int i) {
  40   if (i == 0) {
  41     test_backtrace();
  42     return 0;
  43   } else {
  44     return i + test(i - 1);
  45   }
  46 }
  47
  48 int main(int, char**) {
  49   int total = test(50);
  50   assert(total == 1275);
  51   return 0;
  52 }