public override void ExitWhile_statement(DecafParser.While_statementContext context)
{
if (!TypeHelper.isBoolean(getNodeType(context.expression())))
throw new Exception("Boolean expression expected " + getNodeType(context.expression()).ToString() + " found instead.");
}
public override void ExitRel_op_expression(DecafParser.Rel_op_expressionContext context)
{
if (TypeHelper.isNumeric(getNodeType(context.expression(0)), getNodeType(context.expression(1))))
setNodeType(context, SymbolType.Tboolean);
else
throw new Exception("The expressions have incompatible types.");
}
public override void ExitReturn_statement(DecafParser.Return_statementContext context)
{
if (context.expression() != null)
{
setNodeType(context, getNodeType(context.expression()));
if (!theScopeManager.HasReturn)
theScopeManager.ReturnType = getNodeType(context.expression());
else
if (!TypeHelper.isEquivalentType(theScopeManager.ReturnType, getNodeType(context.expression())))
throw new Exception("Result type mismatch");
}
}
public override void ExitNot_expression(DecafParser.Not_expressionContext context)
{
if (TypeHelper.isBoolean(getNodeType(context.expression())))
setNodeType(context, SymbolType.Tboolean);
else
throw new Exception("Incompatible type. Boolean expected. " + getNodeType(context.expression()).ToString() + " found instead.");
}
public override void ExitParens_expression(DecafParser.Parens_expressionContext context)
{
setNodeType(context, getNodeType(context.expression()));
}
public override void ExitExpression_statement(DecafParser.Expression_statementContext context)
{
if (context.expression() != null)
{
setNodeType(context, getNodeType(context.expression()));
}
else
setNodeType(context, SymbolType.Tvoid);
}
public override void ExitNegative_expression(DecafParser.Negative_expressionContext context)
{
if (TypeHelper.isNumeric(getNodeType(context.expression())))
setNodeType(context, SymbolType.Tint);
else
throw new Exception("Incompatible type. Numeric expected. " + getNodeType(context.expression()).ToString() + " found instead.");
}
public override void ExitChar_assign_statement(DecafParser.Char_assign_statementContext context)
{
SymbolType locationType = getNodeType(context.location());
SymbolType expressionType = getNodeType(context.expression());
if (TypeHelper.isNumeric(expressionType))
if (TypeHelper.isNumeric(locationType))
setNodeType(context, SymbolType.Tchar);
else
throw new Exception("Incompatible types, found location with type "
+ locationType.ToString()
+ " and expression with type "
+ expressionType.ToString());
}
public override void ExitAssign_statement(DecafParser.Assign_statementContext context)
{
SymbolType locationType = getNodeType(context.location());
SymbolType expressionType = getNodeType(context.expression());
if (TypeHelper.isEquivalentType(locationType, expressionType))
setNodeType(context, TypeHelper.getGreatestType(locationType, expressionType));
else
throw new Exception("Incompatible types, found location with type "
+ locationType.ToString()
+ " and expression with type "
+ expressionType.ToString());
}
public override void ExitArray_location(DecafParser.Array_locationContext context)
{
// Finds the current symbol reference.
Symbol tempSymbol = theScopeManager.FindSymbol(context.Id().GetText(), symbolCategory.Cvariable);
if (context.location() != null)
{
StructArraySymbol typedSymbol = tempSymbol as StructArraySymbol;
string structDecName = typedSymbol.ParentStructName;
// Gets the struct definition symbol.
StructDeclSymbol typedParent = theScopeManager.FindSymbol(structDecName, symbolCategory.CstructDecl) as StructDeclSymbol;
theScopeManager.PushSymbolTable(typedParent.Members);
setNodeType(context, getNodeType(context.location()));
if (getNodeValue(context.expression()) > 0)
{
if (getNodeValue(context.expression()) > typedSymbol.length)
{
throw new Exception("Out of bounds exception");
}
}
}
else
{
ArraySymbol typedSymbol = tempSymbol as ArraySymbol;
setNodeType(context, typedSymbol.InternalType);
}
}
public override void ExitArith_expression(DecafParser.Arith_expressionContext context)
{
if (TypeHelper.isNumeric(getNodeType(context.expression(0)), getNodeType(context.expression(1))))
setNodeType(context, SymbolType.Tint);
else
throw new Exception("Incompatible type. Numeric expected.");
}
public override void ExitArg(DecafParser.ArgContext context)
{
setNodeType(context, getNodeType(context.expression()));
}