47e4282c19
Introduces a macro abstraction around capturing the bounds of a function, which many platforms handle subtly differently (Mach-O, and ELF, for example). Also introduce an arm64[^-]* -> aarch64 available feature, to enable more tests that would otherwise be excluded on Apple platforms, whose target triples tend to take the form e.g. 'arm64-apple-macosx', rather than 'aarch64-apple-macosx'. Third, we implement the has-sme check using the appropriate sysctl, as getauxval is not available on Darwin platforms.
76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Ensure that leaf function can be unwund.
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// REQUIRES: target={{(aarch64|loongarch64|riscv64|s390x|x86_64)-.+}}
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// UNSUPPORTED: target={{.*-windows.*}}
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// TODO: Figure out why this fails with Memory Sanitizer.
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// XFAIL: msan
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// Note: this test fails on musl because:
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//
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// (a) musl disables emission of unwind information for its build, and
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// (b) musl's signal trampolines don't include unwind information
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//
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// XFAIL: target={{.*}}-musl
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#undef NDEBUG
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#include "support/func_bounds.h"
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#include <assert.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <unwind.h>
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FUNC_BOUNDS_DECL(main_func);
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_Unwind_Reason_Code frame_handler(struct _Unwind_Context* ctx, void* arg) {
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(void)arg;
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// Unwind until the main is reached, above frames depend on the platform and
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// architecture.
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uintptr_t ip = _Unwind_GetIP(ctx);
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if (ip >= (uintptr_t)FUNC_START(main_func) &&
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ip < (uintptr_t)FUNC_END(main_func)) {
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_Exit(0);
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}
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return _URC_NO_REASON;
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}
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void signal_handler(int signum) {
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(void)signum;
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_Unwind_Backtrace(frame_handler, NULL);
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_Exit(-1);
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}
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__attribute__((noinline)) void crashing_leaf_func(int do_trap) {
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// libunwind searches for the address before the return address which points
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// to the trap instruction. We make the trap conditional and prevent inlining
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// of the function to ensure that the compiler doesn't remove the `ret`
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// instruction altogether.
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//
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// It's also important that the trap instruction isn't the first instruction
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// in the function (which it isn't because of the branch) for other unwinders
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// that also decrement pc.
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if (do_trap)
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__builtin_trap();
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}
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FUNC_ATTR(main_func) int main(int, char **) {
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signal(SIGTRAP, signal_handler);
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signal(SIGILL, signal_handler);
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crashing_leaf_func(1);
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return -2;
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}
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