From 9ed560de2f0f6867e36cf06baa0a0edbd7af171c Mon Sep 17 00:00:00 2001
From: BearOso <bearoso@gmail.com>
Date: Mon, 9 May 2022 15:32:07 -0500
Subject: [PATCH] Make SNES memory allocations static.

---
 libretro/libretro.cpp |  2 +-
 memmap.cpp            | 47 ++++++++-----------------------------------
 memmap.h              |  9 +++++----
 snapshot.cpp          | 14 ++++++-------
 4 files changed, 21 insertions(+), 51 deletions(-)

diff --git a/libretro/libretro.cpp b/libretro/libretro.cpp
index 482d4f3c..b9c8abd2 100644
--- a/libretro/libretro.cpp
+++ b/libretro/libretro.cpp
@@ -1147,7 +1147,7 @@ bool retro_load_game(const struct retro_game_info *game)
         if (randomize_memory)
         {
             srand(time(NULL));
-            for(int lcv = 0; lcv < 0x20000; lcv++)
+            for(int lcv = 0; lcv < sizeof(Memory.RAM); lcv++)
                 Memory.RAM[lcv] = rand() % 256;
         }
     }
diff --git a/memmap.cpp b/memmap.cpp
index 955a6f8b..b1a6aff0 100644
--- a/memmap.cpp
+++ b/memmap.cpp
@@ -893,13 +893,6 @@ static void S9xDeinterleaveGD24 (int size, uint8 *base)
 
 bool8 CMemory::Init (void)
 {
-	// TODO: If these change size, check other locations in the code that also
-	// have the fixed size. In the future, make this a static allocation.
-    RAM	 = (uint8 *) malloc(0x20000);
-    SRAM = (uint8 *) malloc(0x80000);
-    VRAM = (uint8 *) malloc(0x10000);
-    ROM  = (uint8 *) malloc(MAX_ROM_SIZE + 0x200 + 0x8000);
-
 	IPPU.TileCache[TILE_2BIT]       = (uint8 *) malloc(MAX_2BIT_TILES * 64);
 	IPPU.TileCache[TILE_4BIT]       = (uint8 *) malloc(MAX_4BIT_TILES * 64);
 	IPPU.TileCache[TILE_8BIT]       = (uint8 *) malloc(MAX_8BIT_TILES * 64);
@@ -916,8 +909,7 @@ bool8 CMemory::Init (void)
 	IPPU.TileCached[TILE_4BIT_EVEN] = (uint8 *) malloc(MAX_4BIT_TILES);
 	IPPU.TileCached[TILE_4BIT_ODD]  = (uint8 *) malloc(MAX_4BIT_TILES);
 
-	if (!RAM || !SRAM || !VRAM || !ROM ||
-		!IPPU.TileCache[TILE_2BIT]       ||
+	if (!IPPU.TileCache[TILE_2BIT]       ||
 		!IPPU.TileCache[TILE_4BIT]       ||
 		!IPPU.TileCache[TILE_8BIT]       ||
 		!IPPU.TileCache[TILE_2BIT_EVEN]  ||
@@ -936,10 +928,10 @@ bool8 CMemory::Init (void)
 		return (FALSE);
     }
 
-	memset(RAM, 0,  0x20000);
-	memset(SRAM, 0, 0x80000);
-	memset(VRAM, 0, 0x10000);
-	memset(ROM, 0,  MAX_ROM_SIZE + 0x200 + 0x8000);
+	memset(RAM, 0,  sizeof(RAM));
+	memset(SRAM, 0, sizeof(SRAM));
+	memset(VRAM, 0, sizeof(VRAM));
+	memset(ROMStorage, 0,  sizeof(ROMStorage));
 
 	memset(IPPU.TileCache[TILE_2BIT], 0,       MAX_2BIT_TILES * 64);
 	memset(IPPU.TileCache[TILE_4BIT], 0,       MAX_4BIT_TILES * 64);
@@ -960,12 +952,12 @@ bool8 CMemory::Init (void)
 	// FillRAM uses first 32K of ROM image area, otherwise space just
 	// wasted. Might be read by the SuperFX code.
 
-	FillRAM = ROM;
+	FillRAM = &ROMStorage[0];
 
 	// Add 0x8000 to ROM image pointer to stop SuperFX code accessing
 	// unallocated memory (can cause crash on some ports).
 
-	ROM += 0x8000;
+	ROM = &ROMStorage[0x8000];
 
 	C4RAM   = ROM + 0x400000 + 8192 * 8; // C4
 	OBC1RAM = ROM + 0x400000; // OBC1
@@ -985,30 +977,7 @@ bool8 CMemory::Init (void)
 
 void CMemory::Deinit (void)
 {
-	if (RAM)
-	{
-		free(RAM);
-		RAM = NULL;
-	}
-
-	if (SRAM)
-	{
-		free(SRAM);
-		SRAM = NULL;
-	}
-
-	if (VRAM)
-	{
-		free(VRAM);
-		VRAM = NULL;
-	}
-
-	if (ROM)
-	{
-		ROM -= 0x8000;
-		free(ROM);
-		ROM = NULL;
-	}
+	ROM = NULL;
 
 	for (int t = 0; t < 7; t++)
 	{
diff --git a/memmap.h b/memmap.h
index 30f4e0ca..5cfabe4b 100644
--- a/memmap.h
+++ b/memmap.h
@@ -55,10 +55,11 @@ struct CMemory
 	uint8	NSRTHeader[32];
 	int32	HeaderCount;
 
-	uint8	*RAM;
-	uint8	*ROM;
-	uint8	*SRAM;
-	uint8	*VRAM;
+	uint8	RAM[0x20000];
+	uint8	ROMStorage[MAX_ROM_SIZE + 0x200 + 0x8000];
+	uint8   *ROM;
+	uint8	SRAM[0x80000];
+	uint8	VRAM[0x10000];
 	uint8	*FillRAM;
 	uint8	*BWRAM;
 	uint8	*C4RAM;
diff --git a/snapshot.cpp b/snapshot.cpp
index 3175c7d6..834c1365 100644
--- a/snapshot.cpp
+++ b/snapshot.cpp
@@ -1189,11 +1189,11 @@ void S9xFreezeToStream (STREAM stream)
 		dma_snap.dma[d] = DMA[d];
 	FreezeStruct(stream, "DMA", &dma_snap, SnapDMA, COUNT(SnapDMA));
 
-	FreezeBlock (stream, "VRA", Memory.VRAM, 0x10000);
+	FreezeBlock (stream, "VRA", Memory.VRAM, sizeof(Memory.VRAM));
 
-	FreezeBlock (stream, "RAM", Memory.RAM, 0x20000);
+	FreezeBlock (stream, "RAM", Memory.RAM, sizeof(Memory.RAM));
 
-	FreezeBlock (stream, "SRA", Memory.SRAM, 0x80000);
+	FreezeBlock (stream, "SRA", Memory.SRAM, sizeof(Memory.SRAM));
 
 	FreezeBlock (stream, "FIL", Memory.FillRAM, 0x8000);
 
@@ -1391,16 +1391,16 @@ int S9xUnfreezeFromStream (STREAM stream)
 			break;
 
 		if (fast)
-			result = UnfreezeBlock(stream, "RAM", Memory.RAM, 0x20000);
+			result = UnfreezeBlock(stream, "RAM", Memory.RAM, sizeof(Memory.RAM));
 		else
-			result = UnfreezeBlockCopy(stream, "RAM", &local_ram, 0x20000);
+			result = UnfreezeBlockCopy(stream, "RAM", &local_ram, sizeof(Memory.RAM));
 		if (result != SUCCESS)
 			break;
 
 		if (fast)
-			result = UnfreezeBlock(stream, "SRA", Memory.SRAM, 0x80000);
+			result = UnfreezeBlock(stream, "SRA", Memory.SRAM, sizeof(Memory.SRAM));
 		else
-			result = UnfreezeBlockCopy (stream, "SRA", &local_sram, 0x80000);
+			result = UnfreezeBlockCopy (stream, "SRA", &local_sram, sizeof(Memory.SRAM));
 		if (result != SUCCESS)
 			break;