#ifndef SIMGRID_MC_ADDRESS_SPACE_H
#define SIMGRID_MC_ADDRESS_SPACE_H
+#include <cassert>
#include <cstddef>
#include <cstdint>
+#include <cstring>
#include <type_traits>
#include "src/mc/mc_forward.hpp"
-#include "src/mc/remote_ptr.hpp"
+#include "src/mc/RemotePtr.hpp"
namespace simgrid {
namespace mc {
static constexpr ReadOptions lazy() { return ReadOptions(1); }
};
+/** 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>
+class Remote {
+private:
+ // If we use a union, it won't work with abstract types:
+ char buffer[sizeof(T)];
+public:
+ // HACK, some code currently cast this to T* which is **not** legal.
+ void* data() { return buffer; }
+ const void* data() const { return buffer; }
+ constexpr std::size_t size() const { return sizeof(T); }
+ operator T() const {
+ static_assert(std::is_trivial<T>::value, "Cannot convert non trivial type");
+ T res;
+ std::memcpy(&res, buffer, sizeof(T));
+ return res;
+ }
+ Remote() {}
+ Remote(T const& x)
+ {
+ std::memcpy(&x, buffer, sizeof(T));
+ }
+ Remote& operator=(T const& x)
+ {
+ std::memcpy(&x, buffer, sizeof(T));
+ }
+};
+
/** A given state of a given process (abstract base class)
*
* Currently, this might either be:
* @param options
*/
virtual const void* read_bytes(void* buffer, std::size_t size,
- remote_ptr<void> address, int process_index = ProcessIndexAny,
+ RemotePtr<void> address, int process_index = ProcessIndexAny,
ReadOptions options = ReadOptions::none()) const = 0;
/** Read a given data structure from the address space */
template<class T> inline
- void read(T *buffer, remote_ptr<T> ptr, int process_index = ProcessIndexAny)
+ void read(T *buffer, RemotePtr<T> ptr, int process_index = ProcessIndexAny)
{
this->read_bytes(buffer, sizeof(T), ptr, process_index);
}
+ template<class T> inline
+ void read(Remote<T>& buffer, RemotePtr<T> ptr, int process_index = ProcessIndexAny)
+ {
+ this->read_bytes(buffer.data(), sizeof(T), ptr, process_index);
+ }
+
/** Read a given data structure from the address space */
template<class T> inline
- T read(remote_ptr<T> ptr, int process_index = ProcessIndexMissing)
+ Remote<T> read(RemotePtr<T> ptr, int process_index = ProcessIndexMissing)
{
- static_assert(std::is_trivial<T>::value, "Cannot read a non-trivial type");
- T res;
- return *(T*)this->read_bytes(&res, sizeof(T), ptr, process_index);
+ Remote<T> res;
+ this->read_bytes(&res, sizeof(T), ptr, process_index);
+ return res;
}
};