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504bc07d1a
This is needed when running the tests in Freestanding mode, where main() isn't treated specially. In Freestanding, main() doesn't get mangled as extern "C", so whatever runtime we're using fails to find the entry point. One way to solve this problem is to define a symbol alias from __Z4mainiPPc to _main, however this requires all definitions of main() to have the same mangling. Hence this commit.
55 lines
1.6 KiB
C++
55 lines
1.6 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. That causes these tests to
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// fail with those SDKs.
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// FIXME: We mark the test as unsupported on Apple until we have a Lit feature
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// representing the SDK version.
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// UNSUPPORTED: darwin
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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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