private void Visit(ArrayVariableExpr variable)
{
var il = CurrentMethodIL;
var varSymbol = variable.VariableSymbol;
if (varSymbol is GlobalSymbol)
{
var globalVar = varSymbol as GlobalSymbol;
il.Emit(OpCodes.Ldsfld, globalVar.CILField);
}
else if (varSymbol is VariableSymbol)
{
var localVar = varSymbol as VariableSymbol;
il.Emit(OpCodes.Ldloc, localVar.CILLocal);
}
else if (varSymbol is ParameterSymbol)
{
var paramVar = varSymbol as ParameterSymbol;
il.Emit(OpCodes.Ldarg, paramVar.CILParameter.Position - 1);
}
else
{
throw new Exception("Unexpected symboltype " + varSymbol.GetType());
}
Visit((dynamic)variable.SubscriptExpr);
il.Emit(OpCodes.Ldelem, varSymbol.Type.CILType.GetElementType());
ApplyExprSign(variable);
}
private void Visit(ArrayVariableExpr arrayVariableExpr)
{
Symbol symbol = Symbols.Lookup(arrayVariableExpr.ArrayIdentifier);
if (symbol != null)
{
arrayVariableExpr.VariableSymbol = symbol;
Visit((dynamic)arrayVariableExpr.SubscriptExpr);
TypeInfo subscriptType = TypeStack.Pop();
if (!symbol.Type.IsArray)
{
AddError(string.Format("Variable '{0}' is not declared as an array", arrayVariableExpr.ArrayIdentifier), arrayVariableExpr);
TypeStack.Push(TypeInfo.BasicVoid);
}
else if (IsNotVoid(subscriptType) && !subscriptType.SameAs(ExprType.Int))
{
AddError("Array subscript expression has to be of type Int", arrayVariableExpr);
TypeStack.Push(TypeInfo.BasicVoid);
}
else
{
TypeStack.Push(TypeInfo.GetInstance(symbol.Type.BasicType));
arrayVariableExpr.Type = TypeInfo.GetInstance(symbol.Type.BasicType);
}
}
else
{
AddError(string.Format("Undeclared variable '{0}'", arrayVariableExpr.ArrayIdentifier), arrayVariableExpr);
TypeStack.Push(TypeInfo.BasicVoid);
}
}
private VariableExprBase ParseVariable()
{
Token idToken = Match(TokenType.Identifier);
string id = AcceptedToken.Content;
if (Accept(TokenType.LBracket))
{
ArrayVariableExpr expr = new ArrayVariableExpr(idToken);
expr.ArrayIdentifier = id;
expr.SubscriptExpr = ParseExpression();
Match(TokenType.RBracket);
return(expr);
}
return(new VariableExpr(idToken));
}
