| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // Ensure that leaf function can be unwund. |
| // REQUIRES: linux && (target={{aarch64-.+}} || target={{s390x-.+}} || target={{x86_64-.+}}) |
| |
| // TODO: Figure out why this fails with Memory Sanitizer. |
| // XFAIL: msan |
| |
| #undef NDEBUG |
| #include <assert.h> |
| #include <dlfcn.h> |
| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <unwind.h> |
| |
| _Unwind_Reason_Code frame_handler(struct _Unwind_Context* ctx, void* arg) { |
| (void)arg; |
| Dl_info info = { 0, 0, 0, 0 }; |
| |
| // Unwind until the main is reached, above frames deeped on the platform and |
| // architecture. |
| if (dladdr(reinterpret_cast<void *>(_Unwind_GetIP(ctx)), &info) && |
| info.dli_sname && !strcmp("main", info.dli_sname)) { |
| _Exit(0); |
| } |
| return _URC_NO_REASON; |
| } |
| |
| void signal_handler(int signum) { |
| (void)signum; |
| _Unwind_Backtrace(frame_handler, NULL); |
| _Exit(-1); |
| } |
| |
| __attribute__((noinline)) void crashing_leaf_func(void) { |
| // libunwind searches for the address before the return address which points |
| // to the trap instruction. NOP guarantees the trap instruction is not the |
| // first instruction of the function. |
| // We should keep this here for other unwinders that also decrement pc. |
| __asm__ __volatile__("nop"); |
| __builtin_trap(); |
| } |
| |
| int main(int, char**) { |
| signal(SIGTRAP, signal_handler); |
| signal(SIGILL, signal_handler); |
| crashing_leaf_func(); |
| return -2; |
| } |