forked from OSchip/llvm-project
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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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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// UNSUPPORTED: no-exceptions
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// UNSUPPORTED: c++03
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// The <unwind.h> header provided in the SDK of older Xcodes used to provide
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// an incorrectly aligned _Unwind_Exception type on non-ARM. That causes these
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// tests to fail when compiling against such a SDK, or when running against a
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// system libc++abi that was compiled with an incorrect definition of _Unwind_Exception.
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// XFAIL: apple-clang-12.0.0 && !target={{arm.*}}
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// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
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// Test that the address of the exception object is properly aligned as required
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// by the relevant ABI
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#include <cstdint>
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#include <cassert>
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#include <__cxxabi_config.h>
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#include <unwind.h>
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struct __attribute__((aligned)) AlignedType {};
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// EHABI : 8-byte aligned
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// Itanium: Largest supported alignment for the system
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#if defined(_LIBCXXABI_ARM_EHABI)
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# define EXPECTED_ALIGNMENT 8
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#else
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# define EXPECTED_ALIGNMENT alignof(AlignedType)
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#endif
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static_assert(alignof(_Unwind_Exception) == EXPECTED_ALIGNMENT,
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"_Unwind_Exception is incorrectly aligned. This test is expected to fail");
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struct MinAligned { };
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static_assert(alignof(MinAligned) == 1 && sizeof(MinAligned) == 1, "");
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int main(int, char**) {
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for (int i=0; i < 10; ++i) {
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try {
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throw MinAligned{};
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} catch (MinAligned const& ref) {
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assert(reinterpret_cast<uintptr_t>(&ref) % EXPECTED_ALIGNMENT == 0);
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}
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}
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return 0;
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}
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