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// -*- 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: target={{(aarch64|riscv64|s390x|x86_64)-.+linux.*}}
// 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;
}
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