504bc07d1a
This is needed when running the tests in Freestanding mode, where main() isn't treated specially. In Freestanding, main() doesn't get mangled as extern "C", so whatever runtime we're using fails to find the entry point. One way to solve this problem is to define a symbol alias from __Z4mainiPPc to _main, however this requires all definitions of main() to have the same mangling. Hence this commit.
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
// -*- 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: x86_64-linux
|
|
|
|
#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 };
|
|
assert(dladdr((void*)_Unwind_GetIP(ctx), &info));
|
|
|
|
// Unwind util the main is reached, above frames deeped on the platfrom and architecture.
|
|
if(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);
|
|
}
|
|
|
|
int* faultyPointer = NULL;
|
|
|
|
__attribute__((noinline)) void crashing_leaf_func(void) {
|
|
*faultyPointer = 0;
|
|
}
|
|
|
|
int main(int, char**) {
|
|
signal(SIGSEGV, signal_handler);
|
|
crashing_leaf_func();
|
|
return -2;
|
|
} |