降低了罗斯林的行动

本文关键字：罗斯林 | 更新日期: 2023-09-27 18:06:42

当在Roslyn中引入操作时，其中一个目标是提供较低的操作(我认为是在设计审查会议视频中)，据我所知，它应该为高层次的隐式编译器操作提供显式操作。我在Roslyn看到了降低目录，但是类是内部的。现在是否有可能获得较低的操作，或者还没有可用的公共API ?

在下面的示例中，操作已经删除了一些隐式部分——为表达式体添加了返回语句，为重载操作符添加了暴露符号。但是前后增量只根据类型不同而不同。

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Semantics;
using System.Linq;
namespace so39468373
{
    internal static class Program
    {
        private static void Main()
        {
            var tree = CSharpSyntaxTree.ParseText(@"
public class c
{
    public static c operator ++(c o) { return o; }
    static c pre(c o) => ++o;
    static c post(c o) => o++;
    public static void Main() {}
}");
            var mscorlib = MetadataReference.CreateFromFile(typeof(object).Assembly.Location);
            var compilation = CSharpCompilation.Create(null, new[] { tree }, new[] { mscorlib });
            var model = compilation.GetSemanticModel(tree);
            foreach (var node in tree.GetRoot().DescendantNodes().OfType<ArrowExpressionClauseSyntax>())
            {
                var operation = model.GetOperation(node);
                var block = (IBlockStatement)operation;
                var statement = (IReturnStatement)block.Statements.First();
                var increment = (IIncrementExpression)statement.ReturnedValue;
                // How to get lowered operations for increment here?
            }
        }
    }
}

github上的代码- https://github.com/isanych/so-39468373

降低了罗斯林的行动

这个答案的不同角度——编译器的这方面呢?

InternalVisibleTo Attribute

链接:https://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.internalsvisibletoattribute (v = vs.110) . aspx

可能会成为一个有趣的话题，与"不同的角度"有关，用于处理调试?

更多信息(来自文章):

版本信息

通用Windows平台8月开始发售。净框架
2.0以后可用可移植类库
支持:可移植。net平台Silverlight
2.0以后可用Windows Phone Silverlight
7.0以后可用 Windows Phone
8.1版以后可用

检查这个例子将帮助您解决他的问题

using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Text;
namespace Microsoft.CodeAnalysis.CSharp
{
    /// <summary>
    /// The dynamic operation factories below return this struct so that the caller
    /// have the option of separating the call-site initialization from its invocation.
    /// 
    /// Most callers just call <see cref="ToExpression"/> to get the combo but some (object and array initializers) 
    /// hoist all call-site initialization code and emit multiple invocations of the same site.
    /// </summary>
    internal struct LoweredDynamicOperation
    {
        private readonly SyntheticBoundNodeFactory _factory;
        private readonly TypeSymbol _resultType;
        private readonly ImmutableArray<LocalSymbol> _temps;
        public readonly BoundExpression SiteInitialization;
        public readonly BoundExpression SiteInvocation;
        public LoweredDynamicOperation(SyntheticBoundNodeFactory factory, BoundExpression siteInitialization, BoundExpression siteInvocation, TypeSymbol resultType, ImmutableArray<LocalSymbol> temps)
        {
            _factory = factory;
            _resultType = resultType;
            _temps = temps;
            this.SiteInitialization = siteInitialization;
            this.SiteInvocation = siteInvocation;
        }
        public static LoweredDynamicOperation Bad(
            BoundExpression loweredReceiver,
            ImmutableArray<BoundExpression> loweredArguments,
            BoundExpression loweredRight,
            TypeSymbol resultType)
        {
            var children = ArrayBuilder<BoundNode>.GetInstance();
            children.AddOptional(loweredReceiver);
            children.AddRange(loweredArguments);
            children.AddOptional(loweredRight);
            return LoweredDynamicOperation.Bad(resultType, children.ToImmutableAndFree());
        }
        public static LoweredDynamicOperation Bad(TypeSymbol resultType, ImmutableArray<BoundNode> children)
        {
            Debug.Assert(children.Length > 0);
            var bad = new BoundBadExpression(children[0].Syntax, LookupResultKind.Empty, ImmutableArray<Symbol>.Empty, children, resultType);
            return new LoweredDynamicOperation(null, null, bad, resultType, default(ImmutableArray<LocalSymbol>));
        }
        public BoundExpression ToExpression()
        {
            if (_factory == null)
            {
                Debug.Assert(SiteInitialization == null && SiteInvocation is BoundBadExpression && _temps.IsDefaultOrEmpty);
                return SiteInvocation;
            }
            // TODO (tomat): we might be able to use SiteInvocation.Type instead of resultType once we stop using GetLoweredType
            if (_temps.IsDefaultOrEmpty)
            {
                return _factory.Sequence(new[] { SiteInitialization }, SiteInvocation, _resultType);
            }
            else
            {
                return new BoundSequence(_factory.Syntax, _temps, ImmutableArray.Create(SiteInitialization), SiteInvocation, _resultType) { WasCompilerGenerated = true };
            }
        }
    }
}
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