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https://github.com/microsoft/GSL.git
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150 lines
4.5 KiB
Plaintext
150 lines
4.5 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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#include <atomic>
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#include <utility>
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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(_KERNEL_MODE) || (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 // defined(_MSC_VER) && (defined(_KERNEL_MODE) || (defined(_HAS_EXCEPTIONS) &&
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// !_HAS_EXCEPTIONS))
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#include <exception>
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#endif // defined(_MSC_VER) && (defined(_KERNEL_MODE) || (defined(_HAS_EXCEPTIONS) &&
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// !_HAS_EXCEPTIONS))
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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) && !defined(__INTEL_COMPILER)
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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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#define GSL_STRINGIFY_DETAIL(x) #x
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#define GSL_STRINGIFY(x) GSL_STRINGIFY_DETAIL(x)
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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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class contract_group {
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public:
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#ifdef __cpp_noexcept_function_type
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using handler = void (*)() noexcept;
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#else
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using handler = void (*)();
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#endif
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#if defined(__cpp_constexpr) && __cpp_constexpr >= 201806
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constexpr contract_group (handler h) { set_handler(h); }
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#else
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constexpr contract_group (handler h) : chandler(h ? h : []()noexcept{}) { }
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#endif
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#if __cplusplus >= 202002L
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constexpr auto set_handler(handler h) -> handler { return std::exchange(chandler, h ? h : []()noexcept{}); }
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#else
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constexpr auto set_handler(handler h) -> handler { auto old = chandler;
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chandler = h ? h : []()noexcept{};
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return old;
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}
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#endif
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constexpr auto get_handler() -> handler { return chandler; }
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constexpr void expects (bool b) { assertion(b); }
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constexpr void ensures (bool b) { assertion(b); }
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private:
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constexpr void assertion(bool b) { if (!b) chandler(); }
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handler chandler;
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};
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auto static Default = contract_group( &gsl::details::terminate );
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auto static Bounds = contract_group( Default.get_handler() );
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auto static Null = contract_group( Default.get_handler() );
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auto static Testing = contract_group( Default.get_handler() );
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} // namespace gsl
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#define Expects(cond, kind) kind.expects(cond)
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#define Ensures(cond, kind) kind.ensures(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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