source/mem/memory.cpp

@@ -18,6 +18,16 @@ void	MemRemoveNode(sLList *LList,u_short Node);
 sLList		MainRam;
 int			MemNodeCount=0;
 
+#define	USE_MEM_GUARDS
+
+#ifdef	USE_MEM_GUARDS
+static const unsigned int	HEAD_GUARD_FILL_PATTERN	=0x3c3c3c3c;
+static const unsigned int	MEM_FILL_PATTERN		=0x3d3d3d3d;
+static const unsigned int	TAIL_GUARD_FILL_PATTERN	=0x3e3e3e3e;
+static const unsigned int	MEM_GUARD_SIZE=sizeof(int)*2;
+#endif	/* USE_MEM_GUARDS */
+
+
 /*****************************************************************************/
 
 #ifdef __DEBUG_MEM__
@@ -117,6 +127,8 @@ static FontBank s_debugFont;
 
 
 
+
+
 void dumpDebugMem()
 {
 	if (s_dumpMem)
@@ -386,6 +398,9 @@ u32		Len = ((TLen + 3) & 0xfffffffc);
 int		BestNode,FirstNode;
 
 		Len += 4;			//add on 4 to store Addr !
+#ifdef	USE_MEM_GUARDS
+		Len+=(MEM_GUARD_SIZE*2);
+#endif	/* USE_MEM_GUARDS */
 
 // Find First (and possably only)
 		while (Head != 0xffff && mem->Nodes[ Head ].Len<Len) Head = mem->Nodes[ Head ].Next;
@@ -411,8 +426,30 @@ int		BestNode,FirstNode;
 		mem->Nodes[BestNode].Len -= Len;
 	 	mem->Nodes[BestNode].Addr += Len;
 	 	if (mem->Nodes[BestNode].Len == 0) MemRemoveNode( mem, BestNode);
+
+
 		*(u32*)Addr = Len;
 		Addr += 4;
+
+#ifdef	USE_MEM_GUARDS
+		unsigned int	i;
+		for(i=0;i<MEM_GUARD_SIZE;i+=sizeof(int))
+		{
+			*(int*)(Addr+i)=HEAD_GUARD_FILL_PATTERN;
+		}
+		Addr+=MEM_GUARD_SIZE;
+
+		for(i=0;i<((TLen+3)&0xfffffffc);i+=sizeof(int))
+		{
+			*(int*)(Addr+i)=MEM_FILL_PATTERN;
+		}
+
+		for(i=0;i<MEM_GUARD_SIZE;i+=sizeof(int))
+		{
+			*(int*)(Addr+((TLen+3)&0xfffffffc)+i)=TAIL_GUARD_FILL_PATTERN;
+		}
+#endif	/* USE_MEM_GUARDS */
+
 		mem->RamUsed += Len;
 		}
 
@@ -435,10 +472,36 @@ char	*Addr = (char*)Address;
 
 // If file from Databank, dont try and clear it (simple!!)
 		if (CFileIO::IsFromDataBank(Address)) return;
+#ifdef	USE_MEM_GUARDS
+		Addr-=MEM_GUARD_SIZE;
+#endif	/* USE_MEM_GUARDS */
 		Addr -= 4;
-
 		Len = *(u32*)Addr;
 		
+#ifdef	USE_MEM_GUARDS
+		// Check that the guards are intact
+		unsigned int	i;
+		unsigned int	*guardAddr;
+		guardAddr=(unsigned int*)(Addr+4);
+		for(i=0;i<MEM_GUARD_SIZE;i+=sizeof(unsigned int),guardAddr++)
+		{
+			if(*guardAddr!=HEAD_GUARD_FILL_PATTERN)
+			{
+				ASSERT(!"Memory guard trashed (head)");
+				break;
+			}
+		}
+		guardAddr=(unsigned int*)(Addr+Len-MEM_GUARD_SIZE);
+		for(i=0;i<MEM_GUARD_SIZE;i+=sizeof(unsigned int),guardAddr++)
+		{
+			if(*guardAddr!=TAIL_GUARD_FILL_PATTERN)
+			{
+				ASSERT(!"Memory guard trashed (tail)");
+				break;
+			}
+		}
+#endif	/* USE_MEM_GUARDS */
+
 		mem->RamUsed -= Len;
 
 		node = &mem->Nodes[ Head ];

source/paul/paul.cpp

@@ -26,6 +26,14 @@
 #include "gfx\font.h"
 #endif
 
+#ifndef	__MEMORY_HEADER__
+#include "mem\memory.h"
+#endif
+
+#ifndef	__UTILS_HEADER__
+#include "utils\utils.h"
+#endif
+
 
 /*	Std Lib
 	------- */
@@ -49,6 +57,7 @@
 	Vars
 	---- */
 static FontBank		s_fontBank;
+char				*s_mem[3];
 
 
 /*----------------------------------------------------------------------
@@ -65,6 +74,7 @@ void CPaulScene::init()
 	PAUL_DBGMSG("this is a message.. 3");
 
 	s_fontBank.initialise(&standardFont);
+
 }
 
 
@@ -106,11 +116,34 @@ void CPaulScene::render()
 	Params:
 	Returns:
   ---------------------------------------------------------------------- */
+int trashoff=-1;
+int trash=false;
 void CPaulScene::think()
 {
 //	static int	arse=0;
 //	PAUL_DBGMSG("%d\n",arse++);
 //	ASSERT(arse<100);
+
+	int	i;
+	int	size[3];
+
+	for(i=0;i<3;i++)
+	{
+		size[i]=32763;//getRndRange(32768);
+		s_mem[i]=MemAlloc(size[i],"Test");
+	}
+	PAUL_DBGMSG("%d %d %d",size[0],size[1],size[2]);
+
+	if(trash)
+	{
+		*(s_mem[0]+trashoff)=123;
+		trash=false;
+	}
+
+	for(i=0;i<3;i++)
+	{
+		MemFree(s_mem[i]);
+	}
 }