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134 lines
3.7 KiB
Plaintext
134 lines
3.7 KiB
Plaintext
///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
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//
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// This code is licensed under the MIT License (MIT).
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef GSL_CONTRACTS_H
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#define GSL_CONTRACTS_H
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//
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// make suppress attributes parse for some compilers
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// Hopefully temporary until suppression standardization occurs
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//
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#if defined(__clang__)
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#define GSL_SUPPRESS(x) [[gsl::suppress("x")]]
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#else
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#if defined(_MSC_VER)
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#define GSL_SUPPRESS(x) [[gsl::suppress(x)]]
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#else
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#define GSL_SUPPRESS(x)
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#endif // _MSC_VER
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#endif // __clang__
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//
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// Temporary until MSVC STL supports no-exceptions mode.
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// Currently terminate is a no-op in this mode, so we add termination behavior back
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//
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#if defined(_MSC_VER) && defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS
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#define GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND
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#include <intrin.h>
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#define RANGE_CHECKS_FAILURE 0
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#if defined(__clang__)
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Winvalid-noreturn"
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#endif // defined(__clang__)
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#else
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#include <exception>
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#endif // !defined(_MSC_VER) || !defined(_HAS_EXCEPTIONS) || _HAS_EXCEPTIONS
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#define GSL_STRINGIFY_DETAIL(x) #x
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#define GSL_STRINGIFY(x) GSL_STRINGIFY_DETAIL(x)
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#if defined(__clang__) || defined(__GNUC__)
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#define GSL_LIKELY(x) __builtin_expect(!!(x), 1)
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#define GSL_UNLIKELY(x) __builtin_expect(!!(x), 0)
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#else
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#define GSL_LIKELY(x) (!!(x))
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#define GSL_UNLIKELY(x) (!!(x))
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#endif // defined(__clang__) || defined(__GNUC__)
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//
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// GSL_ASSUME(cond)
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//
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// Tell the optimizer that the predicate cond must hold. It is unspecified
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// whether or not cond is actually evaluated.
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//
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#ifdef _MSC_VER
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#define GSL_ASSUME(cond) __assume(cond)
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#elif defined(__GNUC__)
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#define GSL_ASSUME(cond) ((cond) ? static_cast<void>(0) : __builtin_unreachable())
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#else
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#define GSL_ASSUME(cond) static_cast<void>((cond) ? 0 : 0)
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#endif
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//
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// GSL.assert: assertions
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//
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namespace gsl
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{
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namespace details
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{
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#if defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND)
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typedef void(__cdecl* terminate_handler)();
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// clang-format off
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GSL_SUPPRESS(f.6) // NO-FORMAT: attribute
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// clang-format on
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[[noreturn]] inline void __cdecl default_terminate_handler()
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{
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__fastfail(RANGE_CHECKS_FAILURE);
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}
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inline gsl::details::terminate_handler& get_terminate_handler() noexcept
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{
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static terminate_handler handler = &default_terminate_handler;
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return handler;
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}
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#endif // defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND)
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[[noreturn]] inline void terminate() noexcept
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{
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#if defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND)
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(*gsl::details::get_terminate_handler())();
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#else
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std::terminate();
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#endif // defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND)
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}
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} // namespace details
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} // namespace gsl
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#define GSL_CONTRACT_CHECK(type, cond) \
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(GSL_LIKELY(cond) ? static_cast<void>(0) : gsl::details::terminate())
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#define Expects(cond) GSL_CONTRACT_CHECK("Precondition", cond)
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#define Ensures(cond) GSL_CONTRACT_CHECK("Postcondition", cond)
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#if defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND) && defined(__clang__)
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#pragma clang diagnostic pop
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#endif
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#endif // GSL_CONTRACTS_H
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