public override void ExitRelationalExpression(CParser.RelationalExpressionContext context)
{
if (context.relationalExpression() != null)
{
int contextLength = context.GetText().Length;
int lhsLength = context.relationalExpression().GetText().Length;
int rhsLength = context.shiftExpression().GetText().Length;
string operation = context.GetText().Substring(lhsLength, contextLength - (lhsLength + rhsLength));
if (operation == "<")
{
//relationalExpression '<' shiftExpression
SafeCall(context, CExpression.LessThanOperator);
}
else if (operation == ">")
{
//relationalExpression '>' shiftExpression
SafeCall(context, CExpression.GreaterThanOperator);
}
else if (operation == "<=")
{
//relationalExpression '<=' shiftExpression
SafeCall(context, CExpression.LessThanOrEqualOperator);
}
else if (operation == ">=")
{
//relationalExpression '>=' shiftExpression
SafeCall(context, CExpression.GreaterThanOrEqualOperator);
}
}
}
protected ObjectDef EmitRelationalExpression(CParser.RelationalExpressionContext relationalExpression)
{
ObjectDef returnObjectDef = null;
if (relationalExpression.shiftExpression() != null)
{
returnObjectDef = EmitShiftExpression(relationalExpression.shiftExpression());
}
if (relationalExpression.shiftExpression() != null &&
relationalExpression.relationalExpression() != null)
{
var relationalObj = EmitRelationalExpression(relationalExpression.relationalExpression());
if (relationalExpression.Less() != null)
{
relationalObj.Load();
returnObjectDef.Load();
_generatorIL.Emit(OpCodes.Clt);
}
else if (relationalExpression.LessEqual() != null)
{
ObjectDef less;
ObjectDef equal;
relationalObj.Load();
returnObjectDef.Load();
_generatorIL.Emit(OpCodes.Clt);
less = LocalObjectDef.AllocateLocal(typeof(int));
returnObjectDef.Load();
relationalObj.Load();
_generatorIL.Emit(OpCodes.Ceq);
equal = LocalObjectDef.AllocateLocal(typeof(int));
less.Load();
equal.Load();
_generatorIL.Emit(OpCodes.Or);
}
else if (relationalExpression.Greater() != null)
{
relationalObj.Load();
returnObjectDef.Load();
_generatorIL.Emit(OpCodes.Cgt);
}
else if (relationalExpression.GreaterEqual() != null)
{
ObjectDef greater;
ObjectDef equal;
relationalObj.Load();
returnObjectDef.Load();
_generatorIL.Emit(OpCodes.Cgt);
greater = LocalObjectDef.AllocateLocal(typeof(int));
relationalObj.Load();
returnObjectDef.Load();
_generatorIL.Emit(OpCodes.Ceq);
equal = LocalObjectDef.AllocateLocal(typeof(int));
greater.Load();
equal.Load();
_generatorIL.Emit(OpCodes.Or);
}
returnObjectDef = LocalObjectDef.AllocateLocal(typeof(int));
}
return(returnObjectDef);
}
