src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter_Yield.cs - main - githubmirror/roslyn

src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter_Yield.cs

44 строки2 KB

Fred Silberberg

Fix sequence point and instrumentation issues with runtime async (#82236)

10 фев 2026, 20:32

10 фев 2026, 20:323b5698d

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Text;

namespace Microsoft.CodeAnalysis.CSharp
{
    internal sealed partial class LocalRewriter
    {
        public override BoundNode VisitYieldBreakStatement(BoundYieldBreakStatement node)
        {
            var result = (BoundStatement)base.VisitYieldBreakStatement(node)!;

            // We also add sequence points for the implicit "yield break" statement at the end of the method body
            // (added by FlowAnalysisPass.AppendImplicitReturn). Implicitly added "yield break" for async method
            // does not need sequence points added here since it would be done later (presumably during Async rewrite),
            // except in runtime async where the method body is emitted directly.
            // This will need additional testing when async iterators are emitted with runtime async. https://github.com/dotnet/roslyn/issues/75960
            var currentFunction = _factory.CurrentFunction;
            var isRuntimeAsync = currentFunction is not null && _compilation.IsRuntimeAsyncEnabledIn(currentFunction);
            if (this.Instrument &&
                (!node.WasCompilerGenerated || (node.Syntax.Kind() == SyntaxKind.Block && (currentFunction?.IsAsync == false || isRuntimeAsync))))
            {
                result = Instrumenter.InstrumentYieldBreakStatement(node, result);
            }

            return result;
        }

        public override BoundNode VisitYieldReturnStatement(BoundYieldReturnStatement node)
        {
            var result = (BoundStatement)base.VisitYieldReturnStatement(node)!;
            if (this.Instrument && !node.WasCompilerGenerated)
            {
                result = Instrumenter.InstrumentYieldReturnStatement(node, result);
            }

            return result;
        }
    }
}