c2d4f07cda
Original-commit: flang-compiler/f18@009f0cc8df Reviewed-on: https://github.com/flang-compiler/f18/pull/195 Tree-same-pre-rewrite: false
134 lines
4.4 KiB
C++
134 lines
4.4 KiB
C++
// Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef FORTRAN_COMMON_IDIOMS_H_
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#define FORTRAN_COMMON_IDIOMS_H_
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// Defines anything that might ever be useful in more than one source file
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// or that is too weird or too specific to the host C++ compiler to be
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// exposed elsewhere.
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#ifndef __cplusplus
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#error this is a C++ program
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#endif
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#if __cplusplus < 201703L
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#error this is a C++17 program
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#endif
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#if !__clang__ && defined __GNUC__ && __GNUC__ < 7
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#error g++ >= 7.2 is required
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#endif
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#include <functional>
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#include <list>
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#include <optional>
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#include <string>
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#include <tuple>
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#include <type_traits>
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#include <variant>
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#if __GNUC__ == 7
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// Avoid a deduction bug in GNU 7.x headers by forcing the answer.
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namespace std {
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template<typename A>
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struct is_trivially_copy_constructible<list<A>> : false_type {};
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template<typename A>
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struct is_trivially_copy_constructible<optional<list<A>>> : false_type {};
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} // namespace std
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#endif
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// enable "this is a std::string"s with the 's' suffix
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using namespace std::literals::string_literals;
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namespace Fortran::common {
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// Helper templates for combining a list of lambdas into an anonymous
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// struct for use with std::visit() on a std::variant<> sum type.
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// E.g.: std::visit(visitors{
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// [&](const firstType &x) { ... },
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// [&](const secondType &x) { ... },
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// ...
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// [&](const auto &catchAll) { ... }}, variantObject);
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template<typename... LAMBDAS> struct visitors : LAMBDAS... {
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using LAMBDAS::operator()...;
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};
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template<typename... LAMBDAS> visitors(LAMBDAS... x)->visitors<LAMBDAS...>;
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// Calls std::fprintf(stderr, ...), then abort().
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[[noreturn]] void die(const char *, ...);
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// For switch statements without default: labels.
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#define CRASH_NO_CASE \
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Fortran::common::die("no case at " __FILE__ "(%d)", __LINE__)
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// For cheap assertions that should be applied in production.
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// To disable, compile with '-DCHECK=(void)'
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#ifndef CHECK
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#define CHECK(x) \
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((x) || \
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(Fortran::common::die( \
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"CHECK(" #x ") failed at " __FILE__ "(%d)", __LINE__), \
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false))
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#endif
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// User-defined type traits that default to false:
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// Invoke CLASS_TRAIT(traitName) to define a trait, then put
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// using traitName = std::true_type; (or false_type)
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// into the appropriate class definitions. You can then use
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// typename std::enable_if_t<traitName<...>, ...>
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// in template specialization definitions.
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#define CLASS_TRAIT(T) \
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namespace class_trait_ns_##T { \
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template<typename A> std::true_type test(typename A::T *); \
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template<typename A> std::false_type test(...); \
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template<typename A> \
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constexpr bool has_trait{decltype(test<A>(nullptr))::value}; \
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template<typename A> \
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constexpr typename std::enable_if_t<has_trait<A>, bool> trait_value() { \
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using U = typename A::T; \
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return U::value; \
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} \
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template<typename A> \
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constexpr typename std::enable_if_t<!has_trait<A>, bool> trait_value() { \
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return false; \
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} \
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} \
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template<typename A> constexpr bool T{class_trait_ns_##T::trait_value<A>()};
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// Define enum class NAME with the given enumerators, a static
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// function EnumToString() that maps enumerators to std::string,
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// and a constant NAME_enumSize that captures the number of items
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// in the enum class.
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std::string EnumIndexToString(int index, const char *names);
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template<typename A> struct ListItemCount {
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constexpr ListItemCount(std::initializer_list<A> list) : value{list.size()} {}
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const std::size_t value;
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};
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#define ENUM_CLASS(NAME, ...) \
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enum class NAME { __VA_ARGS__ }; \
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static constexpr std::size_t NAME##_enumSize{[] { \
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enum { __VA_ARGS__ }; \
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return Fortran::common::ListItemCount{__VA_ARGS__}.value; \
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}()}; \
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static inline std::string EnumToString(NAME e) { \
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return Fortran::common::EnumIndexToString( \
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static_cast<int>(e), #__VA_ARGS__); \
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}
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} // namespace Fortran::common
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#endif // FORTRAN_COMMON_IDIOMS_H_
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