misc: chore: Fix numerous NullReferenceExceptions, InvalidOperationExceptions

src/Ryujinx.Graphics.Gpu/Engine/MME/MacroJitCompiler.cs

@@ -297,7 +297,7 @@ namespace Ryujinx.Graphics.Gpu.Engine.MME
                     EmitLoadGprA(opCode);
                     EmitLoadImm(opCode);
                     _ilGen.Emit(OpCodes.Add);
-                    _ilGen.Emit(OpCodes.Call, typeof(MacroJitContext).GetMethod(nameof(MacroJitContext.Read)));
+                    _ilGen.Emit(OpCodes.Call, typeof(MacroJitContext).GetMethod(nameof(MacroJitContext.Read))!);
                     break;
 
                 default:
@@ -457,7 +457,7 @@ namespace Ryujinx.Graphics.Gpu.Engine.MME
         private void EmitFetchParam()
         {
             _ilGen.Emit(OpCodes.Ldarg_0);
-            _ilGen.Emit(OpCodes.Call, typeof(MacroJitContext).GetMethod(nameof(MacroJitContext.FetchParam)));
+            _ilGen.Emit(OpCodes.Call, typeof(MacroJitContext).GetMethod(nameof(MacroJitContext.FetchParam))!);
         }
 
         /// <summary>
@@ -508,7 +508,7 @@ namespace Ryujinx.Graphics.Gpu.Engine.MME
         {
             _ilGen.Emit(OpCodes.Ldarg_1);
             _ilGen.Emit(OpCodes.Ldloc_S, _methAddr);
-            _ilGen.Emit(OpCodes.Call, typeof(MacroJitContext).GetMethod(nameof(MacroJitContext.Send)));
+            _ilGen.Emit(OpCodes.Call, typeof(MacroJitContext).GetMethod(nameof(MacroJitContext.Send))!);
             _ilGen.Emit(OpCodes.Ldloc_S, _methAddr);
             _ilGen.Emit(OpCodes.Ldloc_S, _methIncr);
             _ilGen.Emit(OpCodes.Add);

src/Ryujinx.Graphics.Gpu/Image/AutoDeleteCache.cs

@@ -173,24 +173,27 @@ namespace Ryujinx.Graphics.Gpu.Image
         /// </summary>
         private void RemoveLeastUsedTexture()
         {
-            Texture oldestTexture = _textures.First.Value;
-
-            _totalSize -= oldestTexture.Size;
-
-            if (!oldestTexture.CheckModified(false))
+            if (_textures.First != null)
             {
-                // The texture must be flushed if it falls out of the auto delete cache.
-                // Flushes out of the auto delete cache do not trigger write tracking,
-                // as it is expected that other overlapping textures exist that have more up-to-date contents.
+                Texture oldestTexture = _textures.First.Value;
 
-                oldestTexture.Group.SynchronizeDependents(oldestTexture);
-                oldestTexture.FlushModified(false);
+                _totalSize -= oldestTexture.Size;
+
+                if (!oldestTexture.CheckModified(false))
+                {
+                    // The texture must be flushed if it falls out of the auto delete cache.
+                    // Flushes out of the auto delete cache do not trigger write tracking,
+                    // as it is expected that other overlapping textures exist that have more up-to-date contents.
+
+                    oldestTexture.Group.SynchronizeDependents(oldestTexture);
+                    oldestTexture.FlushModified(false);
+                }
+
+                _textures.RemoveFirst();
+
+                oldestTexture.DecrementReferenceCount();
+                oldestTexture.CacheNode = null;
             }
-
-            _textures.RemoveFirst();
-
-            oldestTexture.DecrementReferenceCount();
-            oldestTexture.CacheNode = null;
         }
 
         /// <summary>

src/Ryujinx.Graphics.Gpu/Image/PoolCache.cs

@@ -67,7 +67,8 @@ namespace Ryujinx.Graphics.Gpu.Image
         public T FindOrCreate(GpuChannel channel, ulong address, int maximumId, TextureBindingsArrayCache bindingsArrayCache)
         {
             // Remove old entries from the cache, if possible.
-            while (_pools.Count > MaxCapacity && (_currentTimestamp - _pools.First.Value.CacheTimestamp) >= MinDeltaForRemoval)
+            while (_pools.Count > MaxCapacity && _pools.First != null &&
+                   (_currentTimestamp - _pools.First.Value.CacheTimestamp) >= MinDeltaForRemoval)
             {
                 T oldestPool = _pools.First.Value;
 

src/Ryujinx.Graphics.Gpu/Memory/BufferModifiedRangeList.cs

@@ -372,7 +372,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
 
             if (rangeCount == -1)
             {
-                _migrationTarget.WaitForAndFlushRanges(address, size);
+                _migrationTarget?.WaitForAndFlushRanges(address, size);
 
                 return;
             }

src/Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheHostStorage.cs

@@ -481,7 +481,7 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
             }
 
             int offset = Unsafe.SizeOf<TocHeader>() + programIndex * Unsafe.SizeOf<OffsetAndSize>();
-            if (offset + Unsafe.SizeOf<OffsetAndSize>() > tocFileStream.Length)
+            if (tocFileStream != null && offset + Unsafe.SizeOf<OffsetAndSize>() > tocFileStream.Length)
             {
                 return (null, null);
             }
@@ -491,7 +491,7 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
                 throw new DiskCacheLoadException(DiskCacheLoadResult.FileCorruptedGeneric);
             }
 
-            tocFileStream.Seek(offset, SeekOrigin.Begin);
+            tocFileStream?.Seek(offset, SeekOrigin.Begin);
 
             BinarySerializer tocReader = new(tocFileStream);
 

src/Ryujinx.Graphics.Gpu/Shader/ShaderSpecializationState.cs

@@ -991,8 +991,11 @@ namespace Ryujinx.Graphics.Gpu.Shader
 
             if (hasPipelineState)
             {
-                ProgramPipelineState pipelineState = PipelineState.Value;
-                dataWriter.WriteWithMagicAndSize(ref pipelineState, PgpsMagic);
+                if (PipelineState != null)
+                {
+                    ProgramPipelineState pipelineState = PipelineState.Value;
+                    dataWriter.WriteWithMagicAndSize(ref pipelineState, PgpsMagic);
+                }
             }
 
             if (_queriedState.HasFlag(QueriedStateFlags.TransformFeedback))