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 // This test fails on older llvm, when built with picolibc.
  14 // XFAIL: clang-16 && LIBCXX-PICOLIBC-FIXME
  15
  16 #undef NDEBUG
  17 #include <assert.h>
  18 #include <stdlib.h>
  19 #include <unwind.h>
  20
  21 #define EXPECTED_NUM_FRAMES 50
  22 #define NUM_FRAMES_UPPER_BOUND 100
  23
  24 _Unwind_Reason_Code callback(_Unwind_Context *context, void *cnt) {
  25   (void)context;
  26   int *i = (int *)cnt;
  27   ++*i;
  28   if (*i > NUM_FRAMES_UPPER_BOUND) {
  29     abort();
  30   }
  31   return _URC_NO_REASON;
  32 }
  33
  34 void test_backtrace() {
  35   int n = 0;
  36   _Unwind_Backtrace(&callback, &n);
  37   if (n < EXPECTED_NUM_FRAMES) {
  38     abort();
  39   }
  40 }
  41
  42 int test(int i) {
  43   if (i == 0) {
  44     test_backtrace();
  45     return 0;
  46   } else {
  47     return i + test(i - 1);
  48   }
  49 }
  50
  51 int main(int, char**) {
  52   int total = test(50);
  53   assert(total == 1275);
  54   return 0;
  55 }