|
public IsBaseClassOfClass ( |
||
| pDerived | ||
| pBase | ||
| 리턴 | bool | |
protected override Expr VisitCAST(ExprCast pExpr)
{
Debug.Assert(pExpr != null);
Expr pArgument = pExpr.Argument;
// If we have generated an identity cast or reference cast to a base class
// we can omit the cast.
if (pArgument.Type == pExpr.Type ||
SymbolLoader.IsBaseClassOfClass(pArgument.Type, pExpr.Type) ||
CConversions.FImpRefConv(GetSymbolLoader(), pArgument.Type, pExpr.Type))
{
return(Visit(pArgument));
}
// If we have a cast to PredefinedType.PT_G_EXPRESSION and the thing that we're casting is
// a EXPRBOUNDLAMBDA that is an expression tree, then just visit the expression tree.
if (pExpr.Type != null &&
pExpr.Type.isPredefType(PredefinedType.PT_G_EXPRESSION) &&
pArgument is ExprBoundLambda)
{
return(Visit(pArgument));
}
Expr result = GenerateConversion(pArgument, pExpr.Type, pExpr.isChecked());
if ((pExpr.Flags & EXPRFLAG.EXF_UNBOXRUNTIME) != 0)
{
// Propagate the unbox flag to the call for the ExpressionTreeCallRewriter.
result.Flags |= EXPRFLAG.EXF_UNBOXRUNTIME;
}
return(result);
}