#include <cassert>
#include <cstddef>
#include <cstdint>
+#include <cstring>
#include <type_traits>
+#include <string>
+#include <vector>
+
#include "src/mc/mc_forward.hpp"
#include "src/mc/RemotePtr.hpp"
static constexpr ReadOptions lazy() { return ReadOptions(1); }
};
-/** A value read from another process */
+/** 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>
-class Remote {
+union Remote {
private:
- char buffer[sizeof(T)];
+ T buffer;
public:
- void* data() { return buffer; }
- const void* data() const { return buffer; }
- constexpr std::size_t size() const { return sizeof(T); }
+ Remote() {}
+ ~Remote() {}
+ 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));
+ }
};
/** A given state of a given process (abstract base class)
/** Read a given data structure from the address space */
template<class T> inline
- void read(T *buffer, RemotePtr<T> ptr, int process_index = ProcessIndexAny)
+ void read(T *buffer, RemotePtr<T> ptr, int process_index = ProcessIndexAny) const
{
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)
+ void read(Remote<T>& buffer, RemotePtr<T> ptr, int process_index = ProcessIndexAny) const
{
- this->read_bytes(buffer.data(), sizeof(T), ptr, process_index);
+ this->read_bytes(buffer.getBuffer(), sizeof(T), ptr, process_index);
}
/** Read a given data structure from the address space */
template<class T> inline
- T read(RemotePtr<T> ptr, int process_index = ProcessIndexMissing)
+ Remote<T> read(RemotePtr<T> ptr, int process_index = ProcessIndexMissing) const
{
- 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;
}
+
+ std::string read_string(RemotePtr<char> address, std::size_t len) const
+ {
+ // TODO, use std::vector with .data() in C++17 to avoid useless copies
+ std::vector<char> buffer(len);
+ buffer[len] = '\0';
+ this->read_bytes(buffer.data(), len, address);
+ return std::string(buffer.data(), buffer.size());
+ }
+
};
}