memory fun

Region.cpp/h: fix tile cache memory leaks by replacing raw malloc/free with RAII-compliant std::unique_ptr

Tesselator.cpp/h: fix thread-exit leaks by swapping unmanaged TlsAlloc for auto-cleaning C++17 thread_local std::unique_ptr (constructor now public)

LevelRenderer.cpp: fix heap corruption and array element leaks by changing 'delete' to 'delete[]' for chunk buffers

Minecraft.Client/LevelRenderer.cpp

@@ -367,19 +367,17 @@ void LevelRenderer::setLevel(int playerIndex, MultiPlayerLevel *level)
 	else
 	{
 		//		printf("NULLing player %d, chunks @ 0x%x\n",playerIndex,chunks[playerIndex]);
-		if( chunks[playerIndex].data != nullptr )
-		{
-			for (unsigned int i = 0; i < chunks[playerIndex].length; i++)
-			{
-				chunks[playerIndex][i].chunk->_delete();
-				delete chunks[playerIndex][i].chunk;
-			}
-			delete chunks[playerIndex].data;
-			chunks[playerIndex].data = nullptr;
-			chunks[playerIndex].length = 0;
-			//			delete sortedChunks[playerIndex];	// 4J - removed - not sorting our chunks anymore
-			//			sortedChunks[playerIndex] = nullptr;	// 4J - removed - not sorting our chunks anymore
-		}
+        if (chunks[playerIndex].data != nullptr)
+        {
+            for (unsigned int i = 0; i < chunks[playerIndex].length; i++)
+            {
+                chunks[playerIndex][i].chunk->_delete();
+                delete chunks[playerIndex][i].chunk;
+            }
+            delete[] chunks[playerIndex].data;
+            chunks[playerIndex].data = nullptr;
+            chunks[playerIndex].length = 0;
+        }
 
 		// 4J Stu - If we do this for splitscreen players leaving, then all the tile entities in the world dissappear
 		// We should only do this when actually exiting the game, so only when the primary player sets there level to nullptr
@@ -451,7 +449,7 @@ void LevelRenderer::allChanged(int playerIndex)
 			chunks[playerIndex][i].chunk->_delete();
 			delete chunks[playerIndex][i].chunk;
 		}
-		delete chunks[playerIndex].data;
+        delete[] chunks[playerIndex].data;
 		//		delete sortedChunks[playerIndex];	// 4J - removed - not sorting our chunks anymore
 	}
 

Minecraft.Client/Tesselator.cpp

@@ -24,17 +24,16 @@ int normal;
 
 
 */
-DWORD Tesselator::tlsIdx = TlsAlloc();
+static thread_local std::unique_ptr<Tesselator> tlsInstance;
 
 Tesselator *Tesselator::getInstance()
 {
-	return static_cast<Tesselator *>(TlsGetValue(tlsIdx));
+    return tlsInstance.get();
 }
 
 void Tesselator::CreateNewThreadStorage(int bytes)
 {
-	Tesselator *instance = new Tesselator(bytes/4);
-	TlsSetValue(tlsIdx, instance);
+    tlsInstance = std::make_unique<Tesselator>(bytes / 4);
 }
 
 Tesselator::Tesselator(int size)

Minecraft.Client/Tesselator.h

@@ -34,13 +34,9 @@ private:
 	float xoo, yoo, zoo;
     int _normal;
 
-	// 4J - added for thread local storage
-public:
-	static void CreateNewThreadStorage(int bytes);
-private:
-	static DWORD tlsIdx;
-public:
-	static Tesselator *getInstance();
+ public:
+    static void CreateNewThreadStorage(int bytes);
+    static Tesselator *getInstance();
 
 private:
 	bool tesselating;
@@ -52,6 +48,7 @@ private:
     int vboCounts;
     int size;
 
+  public:
     Tesselator(int size);
 public:
     Tesselator *getUniqueInstance(int size);

Minecraft.World/Region.cpp

@@ -13,12 +13,6 @@
 Region::~Region()
 {
 	// flatChunksHeap automatically freed by unique_ptr
-
-	// AP - added a caching system for Chunk::rebuild to take advantage of
-	if( CachedTiles )
-	{
-		free(CachedTiles);
-	}
 }
 
 Region::Region(Level *level, int x1, int y1, int z1, int x2, int y2, int z2, int r)
@@ -127,11 +121,11 @@ void Region::setCachedTiles(unsigned char *tiles, int xc, int zc)
 	xcCached = xc;
 	zcCached = zc;
 	int size = 16 * 16 * Level::maxBuildHeight;
-	if( CachedTiles == nullptr )
-	{
-		CachedTiles = static_cast<unsigned char *>(malloc(size));
-	}
-	memcpy(CachedTiles, tiles, size);
+    if (!CachedTiles)
+    {
+        CachedTiles = std::make_unique<unsigned char[]>(size);
+    }
+    std::copy(tiles, tiles + size, CachedTiles.get());
 }
 
 LevelChunk* Region::getLevelChunk(int x, int y, int z)

Minecraft.World/Region.h

@@ -19,8 +19,8 @@ private:
 	bool allEmpty;
 
 	// AP - added a caching system for Chunk::rebuild to take advantage of
-	int xcCached, zcCached;
-	unsigned char *CachedTiles;
+    int xcCached, zcCached;
+    std::unique_ptr<unsigned char[]> CachedTiles;
 
 public:
 	Region(Level *level, int x1, int y1, int z1, int x2, int y2, int z2, int r);