/// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        void IIntrinsicPlatformMethod.ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem, IList<RuntimeParameter> parameters)
        {
            var result = context.Result;
            var op1 = context.Operand1;
            var op2 = context.Operand2;
            var constant = Operand.CreateConstant(BuiltInSigType.IntPtr, parameters.Count * 4);

            var eax = Operand.CreateCPURegister(BuiltInSigType.IntPtr, GeneralPurposeRegister.EAX); // FIXME - need access to virtual register allocator
            var edx = Operand.CreateCPURegister(BuiltInSigType.IntPtr, GeneralPurposeRegister.EDX); // FIXME - need access to virtual register allocator
            var esp = Operand.CreateCPURegister(BuiltInSigType.IntPtr, GeneralPurposeRegister.ESP); // FIXME - need access to virtual register allocator
            var ebp = Operand.CreateCPURegister(BuiltInSigType.IntPtr, GeneralPurposeRegister.EBP); // FIXME - need access to virtual register allocator
            context.SetInstruction(X86.Sub, esp, constant);
            context.AppendInstruction(X86.Mov, edx, esp);

            var size = parameters.Count * 4 + 4;
            foreach (var parameter in parameters)
            {
                context.AppendInstruction(X86.Mov, Operand.CreateMemoryAddress(BuiltInSigType.IntPtr, edx, new IntPtr(size - 4)), Operand.CreateMemoryAddress(BuiltInSigType.IntPtr, ebp, new IntPtr(size + 4)));
                size -= 4;
            }
            context.AppendInstruction(X86.Mov, Operand.CreateMemoryAddress(BuiltInSigType.IntPtr, edx, new IntPtr(size - 4)), op1);

            context.AppendInstruction(X86.Mov, eax, op2);
            context.AppendInstruction(X86.Call, null, eax);
            context.AppendInstruction(X86.Add, esp, constant);
            context.AppendInstruction(X86.Mov, result, Operand.CreateCPURegister(result.Type, GeneralPurposeRegister.EAX)); // FIXME - need access to virtual register allocator
        }

 public WebFormsDefaultHandler(ICommunicationContext context, ITypeSystem typeSystem, IDependencyResolver resolver)
 {
     _context = context;
     _typeSystem = typeSystem;
     _resolver = resolver;
     _pageType = typeSystem.FromClr<Page>();
 }

        /// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        void IIntrinsicMethod.ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem, IList<RuntimeParameter> parameters)
        {
            var result = context.Result;
            //var op1 = context.Operand1;
            var op2 = context.Operand2;

            var eax = new RegisterOperand(BuiltInSigType.IntPtr, GeneralPurposeRegister.EAX);
            var edx = new RegisterOperand(BuiltInSigType.IntPtr, GeneralPurposeRegister.EDX);
            var esp = new RegisterOperand(BuiltInSigType.IntPtr, GeneralPurposeRegister.ESP);
            var ebp = new RegisterOperand(BuiltInSigType.IntPtr, GeneralPurposeRegister.EBP);
            context.SetInstruction(X86.Sub, esp, new ConstantOperand(BuiltInSigType.IntPtr, parameters.Count * 4));
            context.AppendInstruction(X86.Mov, edx, esp);

            var size = parameters.Count * 4;
            foreach (var parameter in parameters)
            {
                context.AppendInstruction(X86.Mov, new MemoryOperand(BuiltInSigType.IntPtr, edx.Register, new IntPtr(size - 4)), new MemoryOperand(BuiltInSigType.IntPtr, ebp.Register, new IntPtr(size + 8)));
                size -= 4;
            }

            context.AppendInstruction(X86.Mov, eax, op2);
            context.AppendInstruction(X86.Call, null, new RegisterOperand(BuiltInSigType.IntPtr, GeneralPurposeRegister.EAX));
            context.AppendInstruction(X86.Add, esp, new ConstantOperand(BuiltInSigType.IntPtr, parameters.Count * 4));
            context.AppendInstruction(X86.Mov,result, new RegisterOperand(result.Type, GeneralPurposeRegister.EAX));
        }

        private SymbolOperand GetInternalAllocateStringCallTarget(ITypeSystem typeSystem)
        {
            RuntimeType runtimeType = typeSystem.GetType(@"Mosa.Internal.Runtime");
            RuntimeMethod callTarget = runtimeType.FindMethod(@"AllocateString");

            return SymbolOperand.FromMethod(callTarget);
        }

        /// <summary>
        /// Initializes static data members of the type loader.
        /// </summary>
        /// <param name="typeSystem">The type system.</param>
        public InternalTypeModule(ITypeSystem typeSystem)
        {
            Debug.Assert(typeSystem != null);

            this.typeSystem = typeSystem;
            this.types = new List<RuntimeType>();
        }

        /// <summary>
        /// Initializes static data members of the type loader.
        /// </summary>
        /// <param name="typeSystem">The type system.</param>
        /// <param name="metadataModule">The metadata module.</param>
        public DefaultModuleTypeSystem(ITypeSystem typeSystem, IMetadataModule metadataModule)
        {
            Debug.Assert(typeSystem != null);
            Debug.Assert(metadataModule != null);
            Debug.Assert(metadataModule.Metadata != null);

            this.typeSystem = typeSystem;
            this.metadataModule = metadataModule;
            this.metadata = metadataModule.Metadata;

            methods = new RuntimeMethod[GetTableRows(TokenTypes.MethodDef)];
            fields = new RuntimeField[GetTableRows(TokenTypes.Field)];
            types = new RuntimeType[GetTableRows(TokenTypes.TypeDef)];
            parameters = new RuntimeParameter[GetTableRows(TokenTypes.Param)];

            typeSpecs = new RuntimeType[GetTableRows(TokenTypes.TypeSpec)];
            methodSpecs = new RuntimeMethod[GetTableRows(TokenTypes.MethodSpec)];

            // Load all types from the assembly into the type array
            LoadTypes();
            LoadGenerics();
            LoadTypeSpecs();
            LoadParameters();
            LoadCustomAttributes();
        }

        /// <summary>
        /// Link time code generator used to compile dynamically created methods during link time.
        /// </summary>
        /// <param name="compiler">The assembly compiler used to compile this method.</param>
        /// <param name="methodName">The name of the created method.</param>
        /// <param name="instructionSet">The instruction set.</param>
        /// <returns></returns>
        /// <exception cref="System.ArgumentNullException"><paramref name="compiler"/>, <paramref name="methodName"/> or <paramref name="instructionSet"/> is null.</exception>
        /// <exception cref="System.ArgumentException"><paramref name="methodName"/> is invalid.</exception>
        public static LinkerGeneratedMethod Compile(AssemblyCompiler compiler, string methodName, InstructionSet instructionSet, ITypeSystem typeSystem)
        {
            if (compiler == null)
                throw new ArgumentNullException(@"compiler");
            if (methodName == null)
                throw new ArgumentNullException(@"methodName");
            if (methodName.Length == 0)
                throw new ArgumentException(@"Invalid method name.");

            LinkerGeneratedType compilerGeneratedType = typeSystem.InternalTypeModule.GetType(@"Mosa.Tools.Compiler", @"LinkerGenerated") as LinkerGeneratedType;

            // Create the type if we need to.
            if (compilerGeneratedType == null)
            {
                compilerGeneratedType = new LinkerGeneratedType(typeSystem.InternalTypeModule, @"Mosa.Tools.Compiler", @"LinkerGenerated", null);
                typeSystem.AddInternalType(compilerGeneratedType);
            }

            MethodSignature signature = new MethodSignature(BuiltInSigType.Void, new SigType[0]);

            // Create the method
            // HACK: <$> prevents the method from being called from CIL
            LinkerGeneratedMethod method = new LinkerGeneratedMethod(typeSystem.InternalTypeModule, "<$>" + methodName, compilerGeneratedType, signature);
            compilerGeneratedType.AddMethod(method);

            LinkerMethodCompiler methodCompiler = new LinkerMethodCompiler(compiler, compiler.Pipeline.FindFirst<ICompilationSchedulerStage>(), method, instructionSet);
            methodCompiler.Compile();
            return method;
        }

        /// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        void IIntrinsicPlatformMethod.ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem, IList<RuntimeParameter> parameters)
        {
            // Retrieve register context
            //context.SetInstruction(CPUx86.Instruction.MovInstruction, new RegisterOperand(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX), Operand.CreateMemoryAddress(BuiltInSigType.UInt32, GeneralPurposeRegister.ESP, new IntPtr(28)));

            // Restore registers (Note: EAX and EDX are NOT restored!)
            //context.AppendInstruction(CPUx86.Instruction.MovInstruction, new RegisterOperand(BuiltInSigType.UInt32, GeneralPurposeRegister.EDX), Operand.CreateMemoryAddress(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX, new IntPtr(28)));
            //context.AppendInstruction(CPUx86.Instruction.MovInstruction, new RegisterOperand(BuiltInSigType.UInt32, GeneralPurposeRegister.EBX), Operand.CreateMemoryAddress(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX, new IntPtr(4)));
            //context.AppendInstruction(CPUx86.Instruction.MovInstruction, new RegisterOperand(BuiltInSigType.UInt32, GeneralPurposeRegister.EDI), Operand.CreateMemoryAddress(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX, new IntPtr(20)));
            //context.AppendInstruction(CPUx86.Instruction.MovInstruction, new RegisterOperand(BuiltInSigType.UInt32, GeneralPurposeRegister.ESI), Operand.CreateMemoryAddress(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX, new IntPtr(16)));
            //context.AppendInstruction(CPUx86.Instruction.MovInstruction, new RegisterOperand(BuiltInSigType.UInt32, GeneralPurposeRegister.ESP), Operand.CreateMemoryAddress(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX, new IntPtr(32)));
            //context.AppendInstruction(CPUx86.Instruction.MovInstruction, new RegisterOperand(BuiltInSigType.UInt32, GeneralPurposeRegister.EBP), Operand.CreateMemoryAddress(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX, new IntPtr(24)));

            //uint ebp, uint esp, int eip

            Operand edx = Operand.CreateCPURegister(BuiltInSigType.UInt32, GeneralPurposeRegister.EDX);
            Operand ebp = Operand.CreateCPURegister(BuiltInSigType.UInt32, GeneralPurposeRegister.EBP);
            Operand esp = Operand.CreateCPURegister(BuiltInSigType.UInt32, GeneralPurposeRegister.ESP);

            // Restore registers
            context.SetInstruction(X86.Mov, Operand.CreateCPURegister(BuiltInSigType.UInt32, GeneralPurposeRegister.ESP), context.Operand1);

            // Jmp to EIP (stored in EDX)
            context.AppendInstruction(X86.Jmp, null, edx);

            //context.SetOperand(0, edx);
        }

        public SimpleJitMethodCompiler(AssemblyCompiler compiler, ICompilationSchedulerStage compilationScheduler, RuntimeType type, RuntimeMethod method, Stream codeStream, ITypeSystem typeSystem)
            : base(compiler.Pipeline.FindFirst<IAssemblyLinker>(), compiler.Architecture, compilationScheduler, type, method, typeSystem, compiler.Pipeline.FindFirst<ITypeLayout>())
        {
            if (codeStream == null)
                throw new ArgumentNullException(@"codeStream");

            this.codeStream = codeStream;
        }

        /// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        void IIntrinsicPlatformMethod.ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem, IList<RuntimeParameter> parameters)
        {
            Operand result = context.Result;

            Operand imm = Operand.CreateCPURegister(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX);

            context.SetInstruction(IR.IRInstruction.Move, imm, Operand.CreateCPURegister(BuiltInSigType.UInt32, control));
            context.AppendInstruction(IR.IRInstruction.Move, result, imm);
        }

        /// <summary>
        /// Initializes a new compiler instance.
        /// </summary>
        /// <param name="architecture">The compiler target architecture.</param>
        /// <param name="typeSystem">The type system.</param>
        protected AssemblyCompiler(IArchitecture architecture, ITypeSystem typeSystem)
        {
            if (architecture == null)
                throw new ArgumentNullException(@"architecture");

            this.architecture = architecture;
            this.pipeline = new CompilerPipeline();
            this.typeSystem = typeSystem;
        }

        /// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        void IIntrinsicMethod.ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem, IList<RuntimeParameter> parameters)
        {
            Operand result = context.Result;

            RegisterOperand imm = new RegisterOperand(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX);

            context.SetInstruction(IR.Instruction.MoveInstruction, imm, new RegisterOperand(BuiltInSigType.UInt32, control));
            context.AppendInstruction(IR.Instruction.MoveInstruction, result, imm);
        }

        /// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        void IIntrinsicInternalMethod.ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem, IList<RuntimeParameter> parameters)
        {
            Operand callTargetOperand = this.GetInternalAllocateStringCallTarget(typeSystem);
            Operand methodTableOperand = Operand.CreateSymbol(BuiltInSigType.IntPtr, StringClassMethodTableSymbolName);
            Operand lengthOperand = context.Operand1;
            Operand result = context.Result;

            context.SetInstruction(IRInstruction.Call, result, callTargetOperand, methodTableOperand, lengthOperand);
        }

        /// <summary>
        /// Initializes static data members of the type loader.
        /// </summary>
        /// <param name="typeSystem">The type system.</param>
        public InternalTypeModule(ITypeSystem typeSystem)
        {
            Debug.Assert(typeSystem != null);

            this.typeSystem = typeSystem;
            this.types = new List<RuntimeType>();
            this.methods = new List<RuntimeMethod>();
            this.typeNames = new HashSet<string>();
        }

        /// <summary>
        /// Replaces the instrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        public void ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem)
        {
            Operand result = context.Result;

            RegisterOperand imm = new RegisterOperand(new SigType(CilElementType.U4), GeneralPurposeRegister.EAX);

            context.SetInstruction(IR.Instruction.MoveInstruction, imm, new RegisterOperand(new SigType(CilElementType.U4), _control));
            context.AppendInstruction(IR.Instruction.MoveInstruction, result, imm);
        }

        /// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        public void ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem)
        {
            SymbolOperand callTargetOperand = this.GetInternalAllocateStringCallTarget(typeSystem);
            SymbolOperand methodTableOperand = new SymbolOperand(BuiltInSigType.IntPtr, StringClassMethodTableSymbolName);
            Operand lengthOperand = context.Operand1;
            Operand result = context.Result;

            context.SetInstruction(IR.Instruction.CallInstruction, result, callTargetOperand, methodTableOperand, lengthOperand);
        }

        /// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        void IIntrinsicPlatformMethod.ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem, IList<RuntimeParameter> parameters)
        {
            Operand result = context.Result;

            Operand tmp = Operand.CreateCPURegister(BuiltInSigType.Ptr, GeneralPurposeRegister.EDX);
            Operand operand = Operand.CreateMemoryAddress(context.Operand1.Type, GeneralPurposeRegister.EDX, new System.IntPtr(0));

            context.SetInstruction(X86.Mov, tmp, context.Operand1);
            context.AppendInstruction(X86.Mov, result, operand);
        }

        /// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        void IIntrinsicMethod.ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem, IList<RuntimeParameter> parameters)
        {
            Operand result = context.Result;

            RegisterOperand tmp = new RegisterOperand(BuiltInSigType.Ptr, GeneralPurposeRegister.EDX);
            MemoryOperand operand = new MemoryOperand(context.Operand1.Type, GeneralPurposeRegister.EDX, new System.IntPtr(0));

            context.SetInstruction(X86.Mov, tmp, context.Operand1);
            context.AppendInstruction(X86.Mov, result, operand);
        }

        /// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        void IIntrinsicPlatformMethod.ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem, IList<RuntimeParameter> parameters)
        {
            Operand operand1 = context.Operand1;

            Operand eax = Operand.CreateCPURegister(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX);
            Operand cr = Operand.CreateCPURegister(BuiltInSigType.UInt32, control);

            context.SetInstruction(IR.IRInstruction.Move, eax, operand1);
            context.AppendInstruction(IR.IRInstruction.Move, cr, eax);
        }

        /// <summary>
        /// Replaces the intrinsic call site
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="typeSystem">The type system.</param>
        void IIntrinsicMethod.ReplaceIntrinsicCall(Context context, ITypeSystem typeSystem, IList<RuntimeParameter> parameters)
        {
            Operand operand1 = context.Operand1;

            RegisterOperand eax = new RegisterOperand(BuiltInSigType.UInt32, GeneralPurposeRegister.EAX);
            RegisterOperand cr = new RegisterOperand(BuiltInSigType.UInt32, control);

            context.SetInstruction(IR.Instruction.MoveInstruction, eax, operand1);
            context.AppendInstruction(IR.Instruction.MoveInstruction, cr, eax);
        }