- started reorganizing SW's memory management.

Need to get rid of all those unmanaged allocations and present game data in an easily serializable form.
This adds a managed TPointer class that replicates the useful parts of std::unique_pointer but steers clear of its properties that often render it useless.

source/common/engine/serializer.h

@@ -269,6 +269,32 @@ FSerializer &Serialize(FSerializer &arc, const char *key, TArray<T, TT> &value,
 	return arc;
 }
 
+template<class T, class TT>
+FSerializer& Serialize(FSerializer& arc, const char* key, TPointer<T>& value, TPointer<T>* def)
+{
+	if (arc.isWriting())
+	{
+		if (value.Data() == nullptr && key) return arc;
+	}
+	bool res = arc.BeginArray(key);
+	if (arc.isReading())
+	{
+		if (!res || arc.ArraySize() == 0)
+		{
+			value.Clear();
+			return arc;
+		}
+		value.Alloc();
+	}
+	if (value.Data())
+	{
+		Serialize(arc, nullptr, *value, def ? def->Data() : nullptr);
+	}
+	arc.EndArray();
+	return arc;
+}
+
+
 template<int size> 
 FSerializer& Serialize(FSerializer& arc, const char* key, FixedBitArray<size>& value, FixedBitArray<size>* def)
 {

source/common/utility/tarray.h

@@ -1368,6 +1368,128 @@ protected:
 };
 
 
+// Pointer wrapper without the unpleasant side effects of std::unique_ptr, mainly the inability to copy it.
+// This class owns the object with no means to release it, and copying the pointer copies the object.
+template <class T>
+class TPointer
+{
+public:
+
+	////////
+	TPointer()
+	{
+		Ptr = nullptr;
+	}
+	TPointer(const T& other)
+	{
+		Alloc();
+		*Ptr = other;
+	}
+	TPointer(T&& other)
+	{
+		Alloc();
+		*Ptr = other;
+	}
+	TPointer(const TPointer<T>& other)
+	{
+		DoCopy(other);
+	}
+	TPointer(TPointer<T>&& other)
+	{
+		Ptr = other.Ptr;
+		other.Ptr = nullptr;
+	}
+	TPointer<T>& operator= (const T& other)
+	{
+		if (&other != this)
+		{
+			Alloc();
+			*Ptr = other;
+		}
+		return *this;
+	}
+	TPointer<T>& operator= (const TPointer<T>& other)
+	{
+		if (&other != this)
+		{
+			DoCopy(other);
+		}
+		return *this;
+	}
+	TPointer<T>& operator= (TPointer<T>&& other)
+	{
+		if (&other != this)
+		{
+			if (Ptr) delete Ptr;
+			Ptr = other.Ptr;
+			other.Ptr = nullptr;
+		}
+		return *this;
+	}
+	~TPointer()
+	{
+		if (Ptr) delete Ptr;
+		Ptr = nullptr;
+	}
+	// Check equality of two pointers
+	bool operator==(const TPointer<T>& other) const
+	{
+		return *Ptr == *other.Ptr;
+	}
+
+	T& operator* () const
+	{
+		assert(Ptr);
+		return *Ptr;
+	}
+
+	T* operator->() { return Ptr; }
+
+	// returns raw pointer
+	T* Data() const
+	{
+		return Ptr;
+	}
+
+	operator T* () const
+	{
+		return Ptr;
+	}
+
+	void Alloc()
+	{
+		if (!Ptr) Ptr = new T;
+	}
+
+	void Clear()
+	{
+		if (Ptr) delete Ptr;
+		Ptr = nullptr;
+	}
+
+	void Swap(TPointer<T>& other)
+	{
+		std::swap(Ptr, other.Ptr);
+	}
+
+private:
+	T* Ptr;
+
+	void DoCopy(const TPointer<T>& other)
+	{
+		if (other.Ptr == nullptr)
+		{
+			Clear();
+		}
+		else
+		{
+			Alloc();
+			*Ptr = *other.Ptr;
+		}
+	}
+};
+
+
 
 //==========================================================================
 //

source/games/sw/src/game.h

@@ -1115,12 +1115,22 @@ typedef struct
 // User Extension record
 //
 
-typedef struct
+struct USER
 {
+    // These are for easy zero-init of USERs without having to be on the lookout for non-trivial members.
+    void* operator new(size_t alloc)
+    {
+        return M_Calloc(alloc, 1);
+    }
+    void operator delete (void* mem)
+    {
+        M_Free(mem);
+    }
+
     //
     // Variables that can be used by actors and Player
     //
-    ROTATORp rotator;
+    TPointer<ROTATOR> rotator;
 
     // wall vars for lighting
     int WallCount;
@@ -1269,7 +1279,9 @@ typedef struct
     int16_t oangdiff;      // Used for interpolating sprite angles
 
     uint8_t filler;
-} USER,*USERp;
+};
+
+using USERp = USER*;
 
 struct USERSAVE
 {
@@ -1440,21 +1452,15 @@ typedef struct
 } RANGE,*RANGEp;
 
 
-inline void ClearUser(USER* user)
+#pragma message ("Remove NewUser/FreeUser!")
-{
-    *user = {};
-}
-
 inline USER* NewUser()
 {
-    auto u = (USER*)M_Calloc(sizeof(USER), 1);// new USER;
+    return new USER;
-    ClearUser(u);
-    return u;
 }
 
 inline void FreeUser(int num)
 {
-    if (User[num]) M_Free(User[num]);// delete User[num];
+    if (User[num]) delete User[num];
     User[num] = nullptr;
 }
 

source/games/sw/src/save.cpp

@@ -747,7 +747,11 @@ bool GameInterface::LoadGame()
     while (SpriteNum != -1)
     {
         User[SpriteNum] = u = NewUser();
+        // We need to be careful with allocated content in User when loading a binary save state.
+        // This needs to be refactored out ASAP.
+        u->rotator.Clear();
         MREAD(u,sizeof(USER),1,fil);
+        memset((void*)&u->rotator, 0, sizeof(u->rotator));
 
         if (u->WallShade)
         {
@@ -757,7 +761,7 @@ bool GameInterface::LoadGame()
 
         if (u->rotator)
         {
-            u->rotator = (ROTATORp)CallocMem(sizeof(*u->rotator), 1);
+            u->rotator.Alloc();
             MREAD(u->rotator,sizeof(*u->rotator),1,fil);
 
             if (u->rotator->origx)

source/games/sw/src/sprite.cpp

@@ -790,7 +790,8 @@ KillSprite(int16_t SpriteNum)
                 FreeMem(u->rotator->origx);
             if (u->rotator->origy)
                 FreeMem(u->rotator->origy);
-            FreeMem(u->rotator);
+
+            u->rotator.Clear();
         }
 
         FreeUser(SpriteNum);
@@ -909,7 +910,6 @@ SpawnUser(short SpriteNum, short id, STATEp state)
     u->WaitTics = 0;
     u->OverlapZ = Z(4);
     u->WallShade = NULL;
-    u->rotator = NULL;
     u->bounce = 0;
 
     u->motion_blur_num = 0;
@@ -2404,7 +2404,7 @@ SpriteSetup(void)
                     for (w = startwall, wallcount = 0; w <= endwall; w++)
                         wallcount++;
 
-                    u->rotator = (ROTATORp)CallocMem(sizeof(ROTATOR), 1);
+                    u->rotator.Alloc();
                     u->rotator->num_walls = wallcount;
                     u->rotator->open_dest = SP_TAG5(sp);
                     u->rotator->speed = SP_TAG7(sp);
@@ -2460,7 +2460,7 @@ SpriteSetup(void)
                     u->WaitTics = time*15; // 1/8 of a sec
                     u->Tics = 0;
 
-                    u->rotator = (ROTATORp)CallocMem(sizeof(ROTATOR), 1);
+                    u->rotator.Alloc();
                     u->rotator->open_dest = SP_TAG5(sp);
                     u->rotator->speed = SP_TAG7(sp);
                     u->rotator->vel = SP_TAG8(sp);