private static InterpreterState PrepareInterpreterState(ISymbolicExpressionTree tree, IDataset dataset)
{
Instruction[] code = SymbolicExpressionTreeCompiler.Compile(tree, OpCodes.MapSymbolToOpCode);
int necessaryArgStackSize = 0;
foreach (Instruction instr in code)
{
if (instr.opCode == OpCodes.Variable)
{
var variableTreeNode = (VariableTreeNode)instr.dynamicNode;
instr.data = dataset.GetReadOnlyDoubleValues(variableTreeNode.VariableName);
}
else if (instr.opCode == OpCodes.FactorVariable)
{
var factorTreeNode = instr.dynamicNode as FactorVariableTreeNode;
instr.data = dataset.GetReadOnlyStringValues(factorTreeNode.VariableName);
}
else if (instr.opCode == OpCodes.BinaryFactorVariable)
{
var factorTreeNode = instr.dynamicNode as BinaryFactorVariableTreeNode;
instr.data = dataset.GetReadOnlyStringValues(factorTreeNode.VariableName);
}
else if (instr.opCode == OpCodes.LagVariable)
{
var laggedVariableTreeNode = (LaggedVariableTreeNode)instr.dynamicNode;
instr.data = dataset.GetReadOnlyDoubleValues(laggedVariableTreeNode.VariableName);
}
else if (instr.opCode == OpCodes.VariableCondition)
{
var variableConditionTreeNode = (VariableConditionTreeNode)instr.dynamicNode;
instr.data = dataset.GetReadOnlyDoubleValues(variableConditionTreeNode.VariableName);
}
else if (instr.opCode == OpCodes.Call)
{
necessaryArgStackSize += instr.nArguments + 1;
}
}
return(new InterpreterState(code, necessaryArgStackSize));
}
public static void PrepareInstructions(LinearInstruction[] code, IDataset dataset)
{
for (int i = 0; i != code.Length; ++i)
{
var instr = code[i];
#region opcode switch
switch (instr.opCode)
{
case OpCodes.Constant: {
var constTreeNode = (ConstantTreeNode)instr.dynamicNode;
instr.value = constTreeNode.Value;
instr.skip = true; // the value is already set so this instruction should be skipped in the evaluation phase
}
break;
case OpCodes.Variable: {
var variableTreeNode = (VariableTreeNode)instr.dynamicNode;
instr.data = dataset.GetReadOnlyDoubleValues(variableTreeNode.VariableName);
}
break;
case OpCodes.BinaryFactorVariable: {
var factorVariableTreeNode = instr.dynamicNode as BinaryFactorVariableTreeNode;
instr.data = dataset.GetReadOnlyStringValues(factorVariableTreeNode.VariableName);
}
break;
case OpCodes.FactorVariable: {
var factorVariableTreeNode = instr.dynamicNode as FactorVariableTreeNode;
instr.data = dataset.GetReadOnlyStringValues(factorVariableTreeNode.VariableName);
}
break;
case OpCodes.LagVariable: {
var laggedVariableTreeNode = (LaggedVariableTreeNode)instr.dynamicNode;
instr.data = dataset.GetReadOnlyDoubleValues(laggedVariableTreeNode.VariableName);
}
break;
case OpCodes.VariableCondition: {
var variableConditionTreeNode = (VariableConditionTreeNode)instr.dynamicNode;
instr.data = dataset.GetReadOnlyDoubleValues(variableConditionTreeNode.VariableName);
}
break;
case OpCodes.TimeLag:
case OpCodes.Integral:
case OpCodes.Derivative: {
var seq = GetPrefixSequence(code, i);
var interpreterState = new InterpreterState(seq, 0);
instr.data = interpreterState;
for (int j = 1; j != seq.Length; ++j)
{
seq[j].skip = true;
}
break;
}
}
#endregion
}
}