| 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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| 9 | // UNSUPPORTED: no-exceptions |
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| 10 | // UNSUPPORTED: c++03 |
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| 11 | |
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| 12 | // The <unwind.h> header provided in the SDK of older Xcodes used to provide |
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| 13 | // an incorrectly aligned _Unwind_Exception type on non-ARM. That causes these |
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| 14 | // tests to fail when running against a system libc++abi and libunwind that was |
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| 15 | // compiled with an incorrect definition of _Unwind_Exception. |
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| 16 | // XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12}} |
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| 17 | |
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| 18 | // Test that the address of the exception object is properly aligned as required |
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| 19 | // by the relevant ABI |
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| 20 | |
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| 21 | #include <cstdint> |
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| 22 | #include <cassert> |
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| 23 | #include <__cxxabi_config.h> |
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| 24 | |
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| 25 | #include <unwind.h> |
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| 26 | |
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| 27 | struct __attribute__((aligned)) AlignedType {}; |
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| 28 | |
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| 29 | // EHABI : 8-byte aligned |
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| 30 | // Itanium: Largest supported alignment for the system |
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| 31 | #if defined(_LIBCXXABI_ARM_EHABI) |
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| 32 | # define EXPECTED_ALIGNMENT 8 |
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| 33 | #else |
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| 34 | # define EXPECTED_ALIGNMENT alignof(AlignedType) |
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| 35 | #endif |
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| 36 | |
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| 37 | static_assert(alignof(_Unwind_Exception) == EXPECTED_ALIGNMENT, |
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| 38 | "_Unwind_Exception is incorrectly aligned. This test is expected to fail" ); |
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| 39 | |
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| 40 | struct MinAligned { }; |
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| 41 | static_assert(alignof(MinAligned) == 1 && sizeof(MinAligned) == 1, "" ); |
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| 42 | |
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| 43 | int main(int, char**) { |
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| 44 | for (int i=0; i < 10; ++i) { |
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| 45 | try { |
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| 46 | throw MinAligned{}; |
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| 47 | } catch (MinAligned const& ref) { |
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| 48 | assert(reinterpret_cast<uintptr_t>(&ref) % EXPECTED_ALIGNMENT == 0); |
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| 49 | } |
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| 50 | } |
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| 51 | |
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| 52 | return 0; |
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| 53 | } |
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| 54 | |
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