memory.h
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//===-- runtime/memory.h ----------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Thin wrapper around malloc()/free() to isolate the dependency,
// ease porting, and provide an owning pointer.
#ifndef FORTRAN_RUNTIME_MEMORY_H_
#define FORTRAN_RUNTIME_MEMORY_H_
#include <memory>
namespace Fortran::runtime {
class Terminator;
[[nodiscard]] void *AllocateMemoryOrCrash(
const Terminator &, std::size_t bytes);
template <typename A> [[nodiscard]] A &AllocateOrCrash(const Terminator &t) {
return *reinterpret_cast<A *>(AllocateMemoryOrCrash(t, sizeof(A)));
}
void FreeMemory(void *);
template <typename A> void FreeMemory(A *p) {
FreeMemory(reinterpret_cast<void *>(p));
}
template <typename A> void FreeMemoryAndNullify(A *&p) {
FreeMemory(p);
p = nullptr;
}
template <typename A> struct OwningPtrDeleter {
void operator()(A *p) { FreeMemory(p); }
};
template <typename A> using OwningPtr = std::unique_ptr<A, OwningPtrDeleter<A>>;
template <typename A> class SizedNew {
public:
explicit SizedNew(const Terminator &terminator) : terminator_{terminator} {}
template <typename... X>
[[nodiscard]] OwningPtr<A> operator()(std::size_t bytes, X &&...x) {
return OwningPtr<A>{new (AllocateMemoryOrCrash(terminator_, bytes))
A{std::forward<X>(x)...}};
}
private:
const Terminator &terminator_;
};
template <typename A> struct New : public SizedNew<A> {
using SizedNew<A>::SizedNew;
template <typename... X> [[nodiscard]] OwningPtr<A> operator()(X &&...x) {
return SizedNew<A>::operator()(sizeof(A), std::forward<X>(x)...);
}
};
template <typename A> struct Allocator {
using value_type = A;
explicit Allocator(const Terminator &t) : terminator{t} {}
template <typename B>
explicit constexpr Allocator(const Allocator<B> &that) noexcept
: terminator{that.terminator} {}
Allocator(const Allocator &) = default;
Allocator(Allocator &&) = default;
[[nodiscard]] constexpr A *allocate(std::size_t n) {
return reinterpret_cast<A *>(
AllocateMemoryOrCrash(terminator, n * sizeof(A)));
}
constexpr void deallocate(A *p, std::size_t) { FreeMemory(p); }
const Terminator &terminator;
};
} // namespace Fortran::runtime
#endif // FORTRAN_RUNTIME_MEMORY_H_