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1 //===----------------------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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173
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9 // UNSUPPORTED: no-exceptions
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150
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10 // UNSUPPORTED: c++98, c++03
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11
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12 // The system unwind.h on OS X provides an incorrectly aligned _Unwind_Exception
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13 // type. That causes these tests to fail. This XFAIL is my best attempt at
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14 // working around this failure.
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15 // XFAIL: darwin && libcxxabi-has-system-unwinder
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16
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17 // Test that the address of the exception object is properly aligned as required
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18 // by the relevant ABI
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19
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20 #include <cstdint>
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21 #include <cassert>
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22 #include <__cxxabi_config.h>
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23
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24 #include <unwind.h>
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25
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26 struct __attribute__((aligned)) AlignedType {};
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27
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28 // EHABI : 8-byte aligned
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29 // Itanium: Largest supported alignment for the system
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30 #if defined(_LIBCXXABI_ARM_EHABI)
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31 # define EXPECTED_ALIGNMENT 8
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32 #else
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33 # define EXPECTED_ALIGNMENT alignof(AlignedType)
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34 #endif
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35
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36 static_assert(alignof(_Unwind_Exception) == EXPECTED_ALIGNMENT,
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37 "_Unwind_Exception is incorrectly aligned. This test is expected to fail");
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38
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39 struct MinAligned { };
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40 static_assert(alignof(MinAligned) == 1 && sizeof(MinAligned) == 1, "");
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41
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42 int main() {
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43 for (int i=0; i < 10; ++i) {
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44 try {
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45 throw MinAligned{};
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46 } catch (MinAligned const& ref) {
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47 assert(reinterpret_cast<uintptr_t>(&ref) % EXPECTED_ALIGNMENT == 0);
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48 }
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49 }
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50 }
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