public override int Evaluate(WarriorParser parser, int currentAddress)
{
int l = left.Evaluate(parser, currentAddress);
int r = right.Evaluate(parser, currentAddress);
switch (operation)
{
case BinaryOperation.Plus:
return l + r;
case BinaryOperation.Minus:
return l - r;
case BinaryOperation.Multiply:
return l * r;
case BinaryOperation.Divide:
if (r == 0)
{
parser.WriteError("Divide by zero during evaluation of " + ToString() + " at " + Location, Location);
return 0;
}
return l / r;
case BinaryOperation.Modulo:
if (r == 0)
{
parser.WriteError("Divide by zero during evaluation of " + ToString() + " at " + Location, Location);
return 0;
}
return l % r;
case BinaryOperation.BinOr:
return l | r;
case BinaryOperation.BinXor:
return l ^ r;
case BinaryOperation.BinAnd:
return l & r;
case BinaryOperation.Shl:
return l << r;
case BinaryOperation.Shr:
return l >> r;
case BinaryOperation.Or:
return ((l != 0) || (r != 0)) ? 1 : 0;
case BinaryOperation.And:
return ((l != 0) && (r != 0)) ? 1 : 0;
case BinaryOperation.CompareGt:
return (l > r) ? 1 : 0;
case BinaryOperation.CompareGe:
return (l >= r) ? 1 : 0;
case BinaryOperation.CompareLe:
return (l <= r) ? 1 : 0;
case BinaryOperation.CompareLt:
return (l < r) ? 1 : 0;
case BinaryOperation.CompareEq:
return (l == r) ? 1 : 0;
case BinaryOperation.CompareNe:
return (l != r) ? 1 : 0;
default:
throw new InvalidOperationException();
}
}
public override Mode GetMode(WarriorParser parser, int currentAddress)
{
string fullName = GetFullName(parser, currentAddress);
if (parser.variables.ContainsKey(fullName))
{
Expression ex = parser.variables[fullName];
if (ex == this)
{
parser.WriteError("Label not yet resolved: " + fullName + " at " + Location, Location);
return 0;
}
return ex.GetMode(parser, currentAddress);
}
else
{
parser.WriteError("Label not defined: " + fullName + " at " + Location, Location);
return 0;
}
}
public override int Evaluate(WarriorParser parser, int currentAddress)
{
if (inEval)
{
parser.WriteError("Cyclic definition of function : " + name + " at " + Location, Location);
return 0;
}
try
{
return EvaluateInternal(parser, currentAddress);
}
finally
{
inEval = false;
}
}
protected virtual int EvaluateInternal(WarriorParser parser, int currentAddress)
{
string fullName = GetFullName(parser, currentAddress);
if (parser.variables.ContainsKey(fullName))
{
Expression ex = parser.variables[fullName];
if (ex == this)
{
parser.WriteError("Label not yet resolved: " + fullName + " at " + Location, Location);
return 0;
}
return ex.Evaluate(parser, currentAddress);
}
else
{
parser.WriteError("Label not defined: " + fullName + " at " + Location, Location);
return 0;
}
}
