private void AddRhsExpression(GMacCbComputedVariable computedVar)
{
var expr = computedVar.RhsExpr;
var exprText = expr.ToString();
var tempVar = computedVar as GMacCbTempVariable;
if (tempVar != null)
{
//If this whole expression is already assigned to a temp variable add the temp to the output.
AddTempVariable(exprText, tempVar);
return;
}
//If this whole expression is instead assigned to an output variabe create a factored expression
//temp variable and add it to the output with use count 1 and add the original output
//variable to the output
if (expr.IsSimpleConstantOrLowLevelVariable() == false && _tempVarsDictionary.ContainsKey(exprText) == false)
{
tempVar = new GMacCbTempVariable(CodeBlock.GetNewVarName(), expr, true)
{
SubExpressionUseCount = 1
};
AddTempVariable(exprText, tempVar);
}
AddVariable(computedVar);
}
/// <summary>
/// Test if the given temp item is required to be added
/// </summary>
/// <param name="item"></param>
private void TryAddTempVariable(LlDataItem item)
{
//If this temp item is not in the list of required items for computation just ignore it
if (_activeItemsList.Contains(item.ItemName) == false)
{
return;
}
var rhsExpr =
item.AssignedRhsSymbolicScalar.ToTextExpressionTree();
//Create the temp variable and add it to the target language block
var tempVar =
new GMacCbTempVariable(
item.ItemName,
rhsExpr,
false
)
{
ComputationOrder = _computationOrder--
};
CodeBlock.ComputedVariables.Add(tempVar);
//This item is required for computation.
//All its RHS items must be added to the list of active items
_activeItemsList.AddRange(rhsExpr.GetLowLevelVariablesNames());
if (String.Compare(item.ItemName, _lastUsedVarName, StringComparison.Ordinal) > 0)
{
_lastUsedVarName = item.ItemName;
}
}
private void AddTempVariable(string rhsExprText, GMacCbTempVariable varInfo)
{
varInfo.ComputationOrder = _computedVarsList.Count;
_tempVarsDictionary.Add(rhsExprText, varInfo);
_computedVarsList.Add(varInfo);
}
private void AddRhsExprUse(GMacCbTempVariable tempVar)
{
var rhsExprText = tempVar.RhsExpr.ToString();
List <GMacCbTempVariable> rhsExprUseList;
if (_rhsExprUseDictionary.TryGetValue(rhsExprText, out rhsExprUseList) == false)
{
rhsExprUseList = new List <GMacCbTempVariable>();
_rhsExprUseDictionary.Add(rhsExprText, rhsExprUseList);
}
rhsExprUseList.Add(tempVar);
}
/// <summary>
/// Find or create a temp variable holding the given expression as its RHS
/// </summary>
/// <param name="subExpr"></param>
/// <returns></returns>
private GMacCbTempVariable GetTempVariable(SteExpression subExpr)
{
GMacCbTempVariable tempVar;
var subExprText = subExpr.ToString();
//A temp is found; return it
if (_subExpressionsDictionary.TryGetValue(subExprText, out tempVar))
{
return(tempVar);
}
//A temp is not found; create it and return it
tempVar = new GMacCbTempVariable(CodeBlock.GetNewVarName(), subExpr, true);
_subExpressionsDictionary.Add(subExprText, tempVar);
_newTempVars.Add(tempVar.LowLevelName, tempVar);
return(tempVar);
}
private void AddSubExpressions(GMacCbComputedVariable computedVar)
{
foreach (var subExpr in computedVar.RhsSubExpressions)
{
var subExprText = subExpr.ToString();
GMacCbTempVariable tempVar;
if (_tempVarsDictionary.TryGetValue(subExprText, out tempVar))
{
tempVar.SubExpressionUseCount++;
}
else
{
tempVar = new GMacCbTempVariable(CodeBlock.GetNewVarName(), subExpr, true);
AddTempVariable(subExprText, tempVar);
}
}
AddRhsExpression(computedVar);
}
