internal override Variable AddVariable(string name, Type type, Expression valueAtTopOfScope)
{
if (name == null)
{
throw new ArgumentNullException("name");
}
// If variables cannot be declared in the scope, try the parent scope instead.
if (this.CanDeclareVariables == false)
{
if (this.ParentScope == null)
{
throw new InvalidOperationException("Invalid scope chain.");
}
return(this.ParentScope.AddVariable(name, type, valueAtTopOfScope));
}
Variable variable;
this.variables.TryGetValue(name, out variable);
DeclaredVariable dVariable;
if (variable == null || !(variable is DeclaredVariable))
{
// This is a local variable that has not been declared before (or is an arg being overwritten).
dVariable = new DeclaredVariable()
{
Name = name, Scope = this
};
variable = dVariable;
this.variables[name] = dVariable;
}
else
{
dVariable = (DeclaredVariable)variable;
}
// Set the initial value, if one was provided.
if (valueAtTopOfScope != null)
{
// Function expressions override literals.
if ((valueAtTopOfScope is LiteralExpression && dVariable.ValueAtTopOfScope is FunctionExpression) == false)
{
dVariable.ValueAtTopOfScope = valueAtTopOfScope;
}
}
variable.Type = type;
return(variable);
}
/// <summary>Called before recompiling a function with different args.</summary>
public override void Reset()
{
foreach (KeyValuePair <string, Variable> kvp in variables)
{
DeclaredVariable dec = kvp.Value as DeclaredVariable;
if (dec == null)
{
continue;
}
// Ensure store is cleared out:
dec.Store = null;
}
}
/// <summary>
/// Generates code that initializes the variable and function declarations.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
/// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param>
internal void GenerateDeclarations(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Parent root:
Expression rootExpression = optimizationInfo.RootExpression;
// Initialize the declared variables and functions.
foreach (var variable in this.variables.Values)
{
DeclaredVariable dVariable = variable as DeclaredVariable;
// When a scope is reused, i.e. with an eval(), do not reinitialize the variables.
if (dVariable == null || dVariable.Initialized)
{
continue;
}
if (dVariable.ValueAtTopOfScope != null)
{
// Emit the initialization code.
var name = new NameExpression(this, dVariable.Name);
Type rType = dVariable.ValueAtTopOfScope.GetResultType(optimizationInfo);
name.ApplyType(optimizationInfo, rType);
name.GenerateSet(generator, optimizationInfo, false, rType, delegate(bool two)
{
optimizationInfo.RootExpression = dVariable.ValueAtTopOfScope;
dVariable.ValueAtTopOfScope.GenerateCode(generator, optimizationInfo);
if (two)
{
// Dupe it:
generator.Duplicate();
}
}, false);
// Mark the variable as having been initialized.
dVariable.Initialized = true;
}
}
// Restore root:
optimizationInfo.RootExpression = rootExpression;
}