protected Node Transform(Node node, BasicBlock block, TypeSystem typeSystem, ExpressionVariables variables)
{
var newNode = new InstructionNode(node.Instruction, block);
// todo: determine result type
// todo: determine size
int operandIndex = 0;
foreach (var nodeOperand in node.ParentNodes)
{
if (nodeOperand.NodeType == NodeType.Expression)
{
// todo: expressions
}
else if (nodeOperand.NodeType == NodeType.FixedIntegerConstant)
{
// todo
}
else if (nodeOperand.NodeType == NodeType.FixedDoubleConstant)
{
// todo
}
else if (nodeOperand.NodeType == NodeType.ConstantVariable)
{
newNode.SetOperand(operandIndex++, variables.GetOperand(nodeOperand.Alias));
continue;
}
else if (nodeOperand.NodeType == NodeType.PhyiscalRegister)
{
var type = typeSystem.BuiltIn.I4; // todo
Operand.CreateCPURegister(type, node.PhysicalRegister);
continue;
}
else if (nodeOperand.NodeType == NodeType.VirtualRegister)
{
newNode.SetOperand(operandIndex++, variables.GetOperand(nodeOperand.Alias));
continue;
}
else if (nodeOperand.NodeType == NodeType.OperandVariable)
{
newNode.SetOperand(operandIndex++, variables.GetOperand(nodeOperand.Alias));
continue;
}
throw new CompilerException("Error");
}
return(null);
}
protected bool ValidateOperand(Operand operand, ExpressionVariables variables)
{
if (operand == null)
{
return(false);
}
if (NodeType == NodeType.Instruction)
{
return(false);
}
if (NodeType == NodeType.PhyiscalRegister && operand.IsCPURegister && operand.Register == PhysicalRegister)
{
return(true);
}
if (NodeType == NodeType.VirtualRegister && operand.IsVirtualRegister)
{
return(true);
}
if (NodeType == NodeType.FixedIntegerConstant && operand.IsResolvedConstant && operand.ConstantUnsignedLongInteger == ConstantInteger)
{
return(true);
}
if (NodeType == NodeType.ConstantVariable && operand.IsConstant)
{
var variableOperand = variables.GetOperand(Alias);
if (variableOperand == null)
{
variables.SetOperand(Alias, operand);
return(true);
}
else
{
return(variableOperand.ConstantUnsignedInteger == operand.ConstantUnsignedInteger);
}
}
if (NodeType == NodeType.OperandVariable)
{
var variableOperand = variables.GetOperand(Alias);
if (variableOperand == null)
{
variables.SetOperand(Alias, operand);
return(true);
}
else
{
return(variableOperand == operand);
}
}
if (NodeType == NodeType.TypeVariable)
{
var variableType = variables.GetType(Alias);
if (variableType == null)
{
variables.SetType(Alias, operand.Type);
return(true);
}
else
{
return(variableType == operand.Type);
}
}
return(false);
}