libunwind/test/unwind_leaffunction.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 // Ensure that leaf function can be unwund.
  11 // REQUIRES: linux && (target={{aarch64-.+}} || target={{x86_64-.+}})
  12
  13 #include <assert.h>
  14 #include <dlfcn.h>
  15 #include <signal.h>
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <sys/types.h>
  20 #include <unistd.h>
  21 #include <unwind.h>
  22
  23 _Unwind_Reason_Code frame_handler(struct _Unwind_Context* ctx, void* arg) {
  24   (void)arg;
  25   Dl_info info = { 0, 0, 0, 0 };
  26
  27   // Unwind util the main is reached, above frames deeped on the platfrom and architecture.
  28   if (dladdr(reinterpret_cast<void *>(_Unwind_GetIP(ctx)), &info) &&
  29       info.dli_sname && !strcmp("main", info.dli_sname)) {
  30     _Exit(0);
  31   }
  32   return _URC_NO_REASON;
  33 }
  34
  35 void signal_handler(int signum) {
  36   (void)signum;
  37   _Unwind_Backtrace(frame_handler, NULL);
  38   _Exit(-1);
  39 }
  40
  41 int* faultyPointer = NULL;
  42
  43 __attribute__((noinline)) void crashing_leaf_func(void) {
  44   *faultyPointer = 0;
  45 }
  46
  47 int main(int, char**) {
  48   signal(SIGSEGV, signal_handler);
  49   crashing_leaf_func();
  50   return -2;
  51 }