-/* Copyright (c) 2008-2015. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2008-2019. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#ifndef SIMGRID_MC_REMOTE_PTR_HPP
#define SIMGRID_MC_REMOTE_PTR_HPP
-#include <cstddef>
-#include <cstdint>
-#include <cstring>
-
-#include <stdexcept>
-#include <type_traits>
+#include "src/simix/smx_private.hpp"
namespace simgrid {
namespace mc {
*
* * raw memory copy (std::memcpy) is used to copy Remote<T>;
*
- * * raw memory comparison is used to compare them;
- *
* * when T is a trivial type, Remote is convertible to a T.
*
* We currently only handle the case where the type has the same layout
* in the current process and in the target process: we don't handle
* cross-architecture (such as 32-bit/64-bit access).
*/
-template <class T> union Remote {
+template <class T> class Remote {
private:
- T buffer;
+ typename std::aligned_storage<sizeof(T), alignof(T)>::type buffer;
public:
- Remote() {}
- ~Remote() {}
- Remote(T& p) { std::memcpy(&buffer, &p, sizeof(buffer)); }
- Remote(Remote const& that) { std::memcpy(&buffer, &that.buffer, sizeof(buffer)); }
- Remote& operator=(Remote const& that)
- {
- std::memcpy(&buffer, &that.buffer, sizeof(buffer));
- return *this;
- }
- T* getBuffer() { return &buffer; }
- const T* getBuffer() const { return &buffer; }
- std::size_t getBufferSize() const { return sizeof(T); }
+ Remote() = default;
+ explicit Remote(T const& p) { std::memcpy(&buffer, &p, sizeof buffer); }
+
+ T* get_buffer() { return reinterpret_cast<T*>(&buffer); }
+ const T* get_buffer() const { return reinterpret_cast<const T*>(&buffer); }
+ std::size_t get_buffer_size() const { return sizeof(T); }
operator T() const
{
-//FIXME: assert turned off because smpi:Request is not seen as "trivial".
-// static_assert(std::is_trivial<T>::value, "Cannot convert non trivial type");
- return buffer;
+ static_assert(std::is_trivial<T>::value, "Cannot convert non trivial type");
+ return *get_buffer();
}
- void clear() { std::memset(static_cast<void*>(&buffer), 0, sizeof(T)); }
+ void clear() { std::memset(&buffer, 0, sizeof buffer); }
};
/** Pointer to a remote address-space (process, snapshot)
public:
RemotePtr() : address_(0) {}
- RemotePtr(std::uint64_t address) : address_(address) {}
- RemotePtr(T* address) : address_((std::uintptr_t)address) {}
- RemotePtr(Remote<T*> p) : RemotePtr(*p.getBuffer()) {}
+ explicit RemotePtr(std::nullptr_t) : address_(0) {}
+ explicit RemotePtr(std::uint64_t address) : address_(address) {}
+ explicit RemotePtr(T* address) : address_((std::uintptr_t)address) {}
+ explicit RemotePtr(Remote<T*> p) : address_((std::uintptr_t)*p.get_buffer()) {}
std::uint64_t address() const { return address_; }
/** Turn into a local pointer
T* local() const { return (T*)address_; }
operator bool() const { return address_; }
- bool operator!() const { return !address_; }
+ bool operator!() const { return not address_; }
operator RemotePtr<void>() const { return RemotePtr<void>(address_); }
+ RemotePtr<T>& operator=(std::nullptr_t)
+ {
+ address_ = 0;
+ return *this;
+ }
RemotePtr<T> operator+(std::uint64_t n) const { return RemotePtr<T>(address_ + n * sizeof(T)); }
RemotePtr<T> operator-(std::uint64_t n) const { return RemotePtr<T>(address_ - n * sizeof(T)); }
RemotePtr<T>& operator+=(std::uint64_t n)