/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
#if !CLR2
using System.Linq.Expressions;
#else
using Microsoft.Scripting.Ast;
#endif
using System.Dynamic;
using System.Collections.Generic;
using Microsoft.Scripting.Actions;
using Microsoft.Scripting.Runtime;
using AstUtilsMicrosoft.Scripting.Ast.Utils;
namespace Microsoft.Scripting.Actions.Calls{
using Ast = Expression;
internal sealed class ByRefReturnBuilder : ReturnBuilder {
private IList<int> _returnArgs;
public ByRefReturnBuilder(IList<int> returnArgs)
: base(typeof(object)) {
_returnArgs = returnArgs;
}
internal override Expression ToExpression(OverloadResolver resolver, IList<ArgBuilder> builders, RestrictedArguments args, Expression ret) {
if (_returnArgs.Count == 1) {
if (_returnArgs[0] == -1) {
return ret;
}
return Ast.Block(ret, builders[_returnArgs[0]].ToReturnExpression(resolver));
}
Expression[] retValues = new Expression[_returnArgs.Count];
int rIndex = 0;
bool usesRet = false;
foreach (int index in _returnArgs) {
if (index == -1) {
usesRet = true;
retValues[rIndex++] = ret;
} else {
retValues[rIndex++] = builders[index].ToReturnExpression(resolver);
}
}
Expression retArray = AstUtils.NewArrayHelper(typeof(object), retValues);
if (!usesRet) {
retArray = Ast.Block(ret, retArray);
}
return resolver.GetByRefArrayExpression(retArray);
}
public override int CountOutParams {
get { return _returnArgs.Count; }
}
}
}
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