public override void GenerateCode(Emit.ILGenerator ilg, ExecutionContext ec)
{
/*
* Check for two things:
* 1) Is it an argument?
* 2) Is it a local variable (or global)
*/
var arg = ec.GetParameter(varName);
if (arg != null)
{
//This is an argument - we need to store it in its index.
ilg.Emit(Emit.OpCodes.Starg, arg.Position);
return;
}
var varDec = ec.GetVariable(varName);
if (varDec == null)
{
//The person wants this to be a local variable. It has not been declared, so we must do it for them.
varDec = ilg.DeclareLocal(e.GetEvaluatedType(ec));
ec.AddVariable(varName, varDec);
}
e.Push(ilg, ec);
ilg.Emit(Emit.OpCodes.Stloc, varDec); //Store the result of the expression.
}
public override void Push(Emit.ILGenerator ilg, ExecutionContext ec)
{
var f = Function.Get(funcName).MethodInfo;
var fec = Function.Get(funcName).Ec;
int count = 0;
var pars = fec.GetParameters();
foreach (Expression e in alist)
{
if (count >= fec.NumParameters)
throw new Exception("Too many arguments to function.");
if (pars[count++].Type == e.GetEvaluatedType(ec))
{
e.Push(ilg, ec);
}
else
{
throw new Exception("Mismatch of argument types - no coercing available currently.");
}
}
if (count < fec.NumParameters)
throw new Exception("Too few arguments to function.");
ilg.Emit(Emit.OpCodes.Call, Function.Get(funcName).MethodInfo);
}
//For use with already-defined functions, like Console.WriteLine. Allows you to alias them for use inside the language.
public Function(String funcName, MethodInfo mi)
{
fns.Add(funcName, this);
this.mi = mi;
ec = new ExecutionContext(null);
var parInfos = mi.GetParameters();
Parameter[] pars = new Parameter[parInfos.Length];
for (int i = 0; i < pars.Length; i++)
pars[i] = new Parameter(parInfos[i].ParameterType, parInfos[i].Name);
ec.SetParameters(pars);
}
public Function(Identifier returnType, Identifier name, Sequence<Parameter> pars, Sequence<Statement> stmts)
{
Type[] tar = Parameter.ConvertSequenceToTypeArray(pars);
var mb = CodeGenerator.CreateFunction(name.Value, TypeChecker.ConvertStringToType(returnType.Value), tar);
mi = mb;
this.stmts = stmts;
if (fns.ContainsKey(name.Value))
{
throw new Exception("Function redeclared. Note: overloaded functions are not supported at this time.");
}
fns.Add(name.Value, this);
int count = 1; //parameters start at index 1 - 0 is the return. not sure on GetParameters() though - more testing is needed, but i don't think it includes the returntype as there is a separate way to get that
foreach (Parameter p in pars)
{
mb.DefineParameter(count++, ParameterAttributes.None, p.Name);
}
ec = new ExecutionContext(null);
ec.SetParameters(pars.ToArray());
}
public override Type GetEvaluatedType(ExecutionContext ec)
{
return typeof(string);
}
public abstract void Push(Emit.ILGenerator ilg, ExecutionContext ec);
public abstract void GenerateCode(Emit.ILGenerator ilg, ExecutionContext ec);
public abstract Type GetEvaluatedType(Expression left, Expression right, ExecutionContext ec);
public override Type GetEvaluatedType(Expression left, Expression right, ExecutionContext ec)
{
throw new NotImplementedException("Non + operators are not implemented.");
}
public override Type GetEvaluatedType(Expression left, Expression right, ExecutionContext ec)
{
Type t = left.GetEvaluatedType(ec);
Type t2 = right.GetEvaluatedType(ec);
if (t != t2)
{
throw new NotImplementedException("Type coercion not implemented yet.");
}
return t; //same type because you're adding!
}
public override void Push(Emit.ILGenerator ilg, ExecutionContext ec)
{
/*
* Check for three things:
* 1) Is it an argument?
* 2) Is it a local variable (or global)
* 3) Is it a function call without parantheses?
*/
var arg = ec.GetParameter(name);
if (arg != null)
{
//This is an argument - push its index onto the stack!
ilg.Emit(Emit.OpCodes.Ldarg, arg.Position);
return;
}
var varDec = ec.GetVariable(name);
if (varDec != null)
{
//This is a local variable! Push it onto the stack.
ilg.Emit(Emit.OpCodes.Ldloc, varDec);
return;
}
var funcDec = Function.Get(name);
if (funcDec != null)
{
if (funcDec.MethodInfo.ReturnType != typeof(void))
{
ilg.Emit(Emit.OpCodes.Call, funcDec.MethodInfo); //Only functions without parameters can be called currently - changes to the grammar are needed to improve on this and will likely become their own type of expression
return;
}
else
{
throw new Exception("Attempting to use a void type as an expression.");
}
}
//At this point, we have an unrecognized identifier
throw new Exception("Use of undeclared identifier in expression.");
}
public override Type GetEvaluatedType(ExecutionContext ec)
{
var arg = ec.GetParameter(name);
if (arg != null)
{
return arg.Type;
}
var varDec = ec.GetVariable(name);
if (varDec != null)
{
return varDec.LocalType;
}
var funcDec = Function.Get(name);
if (funcDec != null)
{
return funcDec.MethodInfo.ReturnType;
}
//At this point, we have an unrecognized identifier
throw new Exception("Use of undeclared identifier in expression.");
}
public override void GenerateCode(Emit.ILGenerator ilg, ExecutionContext ec)
{
this.fc.Push(ilg, ec);
}
public override void Push(Emit.ILGenerator ilg, ExecutionContext ec)
{
ilg.Emit(Emit.OpCodes.Ldstr, s);
}
public override Type GetEvaluatedType(ExecutionContext ec)
{
return this.o.GetEvaluatedType(left, right, ec);
}
public override Type GetEvaluatedType(ExecutionContext ec)
{
return Function.Get(funcName).MethodInfo.ReturnType;
}
public override void Push(Emit.ILGenerator ilg, ExecutionContext ec)
{
this.o.Evaluate(left, right, ilg, ec);
}
public ExecutionContext(ExecutionContext p)
{
this.parent = p;
}
public override Type GetEvaluatedType(ExecutionContext ec)
{
throw new NotImplementedException();
}
public override void Evaluate(Expression left, Expression right, Emit.ILGenerator ilg, ExecutionContext ec)
{
throw new NotImplementedException("Non + operators are not implemented.");
}
public override void Push(Emit.ILGenerator ilg, ExecutionContext ec)
{
throw new NotImplementedException();
}
public abstract void Evaluate(Expression left, Expression right, Emit.ILGenerator ilg, ExecutionContext ec);
public abstract Type GetEvaluatedType(ExecutionContext ec);
public override void Evaluate(Expression left, Expression right, Emit.ILGenerator ilg, ExecutionContext ec)
{
Type t = left.GetEvaluatedType(ec);
Type t2 = right.GetEvaluatedType(ec);
if (t != t2)
{
throw new NotImplementedException("Type coercion not implemented yet.");
}
if (t == typeof(string))
{
//Concatenate strings! Fun for all.
//TODO: optimize the shit out of this to determine if there is tons of concatenating going on because this is inefficient as hell for something like "lol" + "hi" + 3
//TODO: classes with operator overloading so I don't need to do special exceptions within the language code itself. I dislike that.
left.Push(ilg, ec);
right.Push(ilg, ec);
ilg.Emit(Emit.OpCodes.Call, typeof(String).GetMethod("Concat", new Type[] { typeof(string), typeof(string) }));
}
}
public override void GenerateCode(Emit.ILGenerator ilg, ExecutionContext ec)
{
if (this.returnExp != null)
this.returnExp.Push(ilg, ec);
ilg.Emit(Emit.OpCodes.Ret);
}