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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
//
//===----------------------------------------------------------------------===//
// REQUIRES: linux
// TODO: Figure out why this fails with Memory Sanitizer.
// XFAIL: msan
// Basic test for _Unwind_ForcedUnwind.
// See libcxxabi/test/forced_unwind* tests too.
#undef NDEBUG
#include <assert.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <unwind.h>
// Using __attribute__((section("main_func"))) is Linux specific, but then
// this entire test is marked as requiring Linux, so we should be good.
//
// We don't use dladdr() because on musl it's a no-op when statically linked.
extern char __start_main_func;
extern char __stop_main_func;
void foo();
_Unwind_Exception ex;
_Unwind_Reason_Code stop(int version, _Unwind_Action actions,
_Unwind_Exception_Class exceptionClass,
_Unwind_Exception *exceptionObject,
struct _Unwind_Context *context,
void *stop_parameter) {
assert(version == 1);
assert((actions & _UA_FORCE_UNWIND) != 0);
(void)exceptionClass;
assert(exceptionObject == &ex);
assert(stop_parameter == &foo);
// Unwind until the main is reached, above frames depend on the platform and
// architecture.
uintptr_t ip = _Unwind_GetIP(context);
if (ip >= (uintptr_t)&__start_main_func && ip < (uintptr_t)&__stop_main_func) {
_Exit(0);
}
return _URC_NO_REASON;
}
__attribute__((noinline)) void foo() {
// Arm EHABI defines struct _Unwind_Control_Block as exception
// object. Ensure struct _Unwind_Exception* work there too,
// because _Unwind_Exception in this case is just an alias.
struct _Unwind_Exception *e = &ex;
#if defined(_LIBUNWIND_ARM_EHABI)
// Create a mock exception object.
memset(e, '\0', sizeof(*e));
strcpy(reinterpret_cast<char *>(&e->exception_class), "CLNGUNW");
#endif
_Unwind_ForcedUnwind(e, stop, (void *)&foo);
}
__attribute__((section("main_func"))) int main() {
foo();
return -2;
}
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