#ifndef SIMGRID_MC_REMOTE_PTR_HPP
#define SIMGRID_MC_REMOTE_PTR_HPP
+#include <cstddef>
#include <cstdint>
+#include <cstring>
+
+#include <stdexcept>
+#include <type_traits>
namespace simgrid {
namespace mc {
+/** HACK, A value from another process
+ *
+ * This represents a value from another process:
+ *
+ * * constructor/destructor are disabled;
+ *
+ * * 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 {
+private:
+ T 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); }
+ operator T() const {
+ static_assert(std::is_trivial<T>::value, "Cannot convert non trivial type");
+ return buffer;
+ }
+ void clear()
+ {
+ std::memset(static_cast<void*>(&buffer), 0, sizeof(T));
+ }
+
+};
+
/** Pointer to a remote address-space (process, snapshot)
*
* With this we can clearly identify the expected type of an address in the
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()) {}
std::uint64_t address() const { return address_; }
+ /** Turn into a local pointer
+ *
+ (if the remote process is not, in fact, remote) */
+ T* local() const { return (T*) address_; }
+
operator bool() const
{
return address_;
