//mostly used for logical operators and ducky mode
//other cases of bool context are handled by PMB
bool EmitToBoolIfNeeded(Expression expression, ref bool notContext)
{
bool inNotContext = notContext;
notContext = false;
//use a builtin conversion operator just for the logical operator trueness test
IType type = GetExpressionType(expression);
if (TypeSystemServices.ObjectType == type || TypeSystemServices.DuckType == type)
{
_il.EmitCall(OpCodes.Call, RuntimeServices_ToBool_Object, null);
return true;
}
else if (TypeSystemServices.IsNullable(type))
{
_il.Emit(OpCodes.Ldloca, _currentLocal);
Type sType = GetSystemType(TypeSystemServices.GetNullableUnderlyingType(type));
_il.EmitCall(OpCodes.Call, GetNullableHasValue(sType), null);
LocalBuilder hasValue = StoreTempLocal(TypeSystemServices.BoolType);
_il.Emit(OpCodes.Pop); //pop nullable address (ldloca)
_il.Emit(OpCodes.Ldloc, hasValue);
return true;
}
else if (TypeSystemServices.StringType == type)
{
_il.EmitCall(OpCodes.Call, String_IsNullOrEmpty, null);
if (!inNotContext)
EmitIntNot(); //reverse result (true for not empty)
else
notContext = true;
return true;
}
else if (TypeSystemServices.IsIntegerNumber(type))
{
if (TypeSystemServices.LongType == type || TypeSystemServices.ULongType == type)
_il.Emit(OpCodes.Conv_I4);
return true;
}
else if (TypeSystemServices.SingleType == type)
{
EmitDefaultValue(TypeSystemServices.SingleType);
_il.Emit(OpCodes.Ceq);
if (!inNotContext)
EmitIntNot();
else
notContext = true;
return true;
}
else if (TypeSystemServices.DoubleType == type)
{
EmitDefaultValue(TypeSystemServices.DoubleType);
_il.Emit(OpCodes.Ceq);
if (!inNotContext)
EmitIntNot();
else
notContext = true;
return true;
}
else if (TypeSystemServices.DecimalType == type)
{
_il.EmitCall(OpCodes.Call, RuntimeServices_ToBool_Decimal, null);
return true;
}
else if (!type.IsValueType)
{
if (null == expression.GetAncestor<BinaryExpression>()
&& null != expression.GetAncestor<IfStatement>())
return true; //use br(true|false) directly (most common case)
_il.Emit(OpCodes.Ldnull);
if (!inNotContext)
{
_il.Emit(OpCodes.Cgt_Un);
}
else
{
_il.Emit(OpCodes.Ceq);
notContext = true;
}
return true;
}
return false;
}
