| public static While ( Expression test, Expression body, Expression @else ) : LoopExpression | ||
| test | Expression | |
| body | Expression | |
| @else | Expression | |
| 리턴 | LoopExpression | |
private MSAst.Expression ReduceWorker(bool optimizeDynamicConvert)
{
// Only the body is "in the loop" for the purposes of break/continue
// The "else" clause is outside
ConstantExpression constTest = _test as ConstantExpression;
if (constTest != null && constTest.Value is int)
{
// while 0: / while 1:
int val = (int)constTest.Value;
if (val == 0)
{
// completely optimize the loop away
if (_else == null)
{
return(MSAst.Expression.Empty());
}
else
{
return(_else);
}
}
MSAst.Expression test = MSAst.Expression.Constant(true);
MSAst.Expression res = AstUtils.While(
test,
_body,
_else,
_break,
_continue
);
if (GlobalParent.IndexToLocation(_test.StartIndex).Line != GlobalParent.IndexToLocation(_body.StartIndex).Line)
{
res = GlobalParent.AddDebugInfoAndVoid(res, _test.Span);
}
return(res);
}
return(AstUtils.While(
GlobalParent.AddDebugInfo(
optimizeDynamicConvert ?
TransformAndDynamicConvert(_test, typeof(bool)) :
GlobalParent.Convert(typeof(bool), Microsoft.Scripting.Actions.ConversionResultKind.ExplicitCast, _test),
Header
),
_body,
_else,
_break,
_continue
));
}
