Remove IChecksummedObject type.

src/VisualStudio/Core/Def/ProjectSystem/MetadataReferences/VisualStudioMetadataReferenceManager.cs

@@ -233,13 +233,13 @@ static void GetStorageInfoFromTemporaryStorage(
                 // location, so we can create a metadata value wrapping that.  This will also let us share the memory
                 // for that metadata value with our OOP process.
                 copyStream.Position = 0;
-                storageHandle = temporaryStorageService.WriteToTemporaryStorage(copyStream, CancellationToken.None);
+                storageHandle = temporaryStorageService.WriteToTemporaryStorage(copyStream);
             }
 
             // Now, read the data from the memory-mapped-file back into a stream that we load into the metadata value.
             // The ITemporaryStorageStreamHandle should have given us an UnmanagedMemoryStream
             // since this only runs on Windows for VS.
-            stream = (UnmanagedMemoryStream)storageHandle.ReadFromTemporaryStorage(CancellationToken.None);
+            stream = (UnmanagedMemoryStream)storageHandle.ReadFromTemporaryStorage();
 
             // stream size must be same as what metadata reader said the size should be.
             Contract.ThrowIfFalse(stream.Length == size);

src/Workspaces/Core/Portable/Remote/ISerializerService.cs

@@ -11,9 +11,6 @@ namespace Microsoft.CodeAnalysis.Serialization;
 internal interface ISerializerService : IWorkspaceService
 {
     void Serialize(object value, ObjectWriter writer, CancellationToken cancellationToken);
-
-    void SerializeParseOptions(ParseOptions options, ObjectWriter writer);
-
     object Deserialize(WellKnownSynchronizationKind kind, ObjectReader reader, CancellationToken cancellationToken);
 
     Checksum CreateChecksum(object value, CancellationToken cancellationToken);

src/Workspaces/Core/Portable/Serialization/SerializerService.cs

@@ -74,11 +74,6 @@ public Checksum CreateChecksum(object value, CancellationToken cancellationToken
         {
             cancellationToken.ThrowIfCancellationRequested();
 
-            if (value is IChecksummedObject checksummedObject)
-            {
-                return checksummedObject.Checksum;
-            }
-
             switch (kind)
             {
                 case WellKnownSynchronizationKind.CompilationOptions:
@@ -89,10 +84,10 @@ public Checksum CreateChecksum(object value, CancellationToken cancellationToken
                     return Checksum.Create(value, this, cancellationToken);
 
                 case WellKnownSynchronizationKind.MetadataReference:
-                    return CreateChecksum((MetadataReference)value, cancellationToken);
+                    return CreateChecksum((MetadataReference)value);
 
                 case WellKnownSynchronizationKind.AnalyzerReference:
-                    return CreateChecksum((AnalyzerReference)value, cancellationToken);
+                    return CreateChecksum((AnalyzerReference)value);
 
                 case WellKnownSynchronizationKind.SerializableSourceText:
                     throw new InvalidOperationException("Clients can already get a checksum directly from a SerializableSourceText");
@@ -141,15 +136,15 @@ public void Serialize(object value, ObjectWriter writer, CancellationToken cance
                     return;
 
                 case WellKnownSynchronizationKind.ProjectReference:
-                    SerializeProjectReference((ProjectReference)value, writer, cancellationToken);
+                    SerializeProjectReference((ProjectReference)value, writer);
                     return;
 
                 case WellKnownSynchronizationKind.MetadataReference:
-                    SerializeMetadataReference((MetadataReference)value, writer, cancellationToken);
+                    SerializeMetadataReference((MetadataReference)value, writer);
                     return;
 
                 case WellKnownSynchronizationKind.AnalyzerReference:
-                    SerializeAnalyzerReference((AnalyzerReference)value, writer, cancellationToken: cancellationToken);
+                    SerializeAnalyzerReference((AnalyzerReference)value, writer);
                     return;
 
                 case WellKnownSynchronizationKind.SerializableSourceText:
@@ -274,8 +269,8 @@ public object Deserialize(WellKnownSynchronizationKind kind, ObjectReader reader
                 WellKnownSynchronizationKind.CompilationOptions => DeserializeCompilationOptions(reader, cancellationToken),
                 WellKnownSynchronizationKind.ParseOptions => DeserializeParseOptions(reader, cancellationToken),
                 WellKnownSynchronizationKind.ProjectReference => DeserializeProjectReference(reader, cancellationToken),
-                WellKnownSynchronizationKind.MetadataReference => DeserializeMetadataReference(reader, cancellationToken),
-                WellKnownSynchronizationKind.AnalyzerReference => DeserializeAnalyzerReference(reader, cancellationToken),
+                WellKnownSynchronizationKind.MetadataReference => DeserializeMetadataReference(reader),
+                WellKnownSynchronizationKind.AnalyzerReference => DeserializeAnalyzerReference(reader),
                 WellKnownSynchronizationKind.SerializableSourceText => SerializableSourceText.Deserialize(reader, _storageService.Value, _textService, cancellationToken),
                 WellKnownSynchronizationKind.SourceGeneratorExecutionVersionMap => SourceGeneratorExecutionVersionMap.Deserialize(reader),
                 WellKnownSynchronizationKind.FallbackAnalyzerOptions => ReadFallbackAnalyzerOptions(reader),

src/Workspaces/Core/Portable/Serialization/SerializerService_Asset.cs

@@ -64,10 +64,8 @@ private ParseOptions DeserializeParseOptions(ObjectReader reader, CancellationTo
         return service.ReadParseOptionsFrom(reader, cancellationToken);
     }
 
-    private static void SerializeProjectReference(ProjectReference reference, ObjectWriter writer, CancellationToken cancellationToken)
+    private static void SerializeProjectReference(ProjectReference reference, ObjectWriter writer)
     {
-        cancellationToken.ThrowIfCancellationRequested();
-
         reference.ProjectId.WriteTo(writer);
         writer.WriteArray(reference.Aliases, static (w, a) => w.WriteString(a));
         writer.WriteBoolean(reference.EmbedInteropTypes);
@@ -84,27 +82,15 @@ private static ProjectReference DeserializeProjectReference(ObjectReader reader,
         return new ProjectReference(projectId, aliases.ToImmutableArrayOrEmpty(), embedInteropTypes);
     }
 
-    private void SerializeMetadataReference(MetadataReference reference, ObjectWriter writer, CancellationToken cancellationToken)
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        WriteMetadataReferenceTo(reference, writer, cancellationToken);
-    }
+    private void SerializeMetadataReference(MetadataReference reference, ObjectWriter writer)
+        => WriteMetadataReferenceTo(reference, writer);
 
-    private MetadataReference DeserializeMetadataReference(ObjectReader reader, CancellationToken cancellationToken)
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return ReadMetadataReferenceFrom(reader, cancellationToken);
-    }
+    private MetadataReference DeserializeMetadataReference(ObjectReader reader)
+        => ReadMetadataReferenceFrom(reader);
 
-    private void SerializeAnalyzerReference(AnalyzerReference reference, ObjectWriter writer, CancellationToken cancellationToken)
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        WriteAnalyzerReferenceTo(reference, writer, cancellationToken);
-    }
+    private void SerializeAnalyzerReference(AnalyzerReference reference, ObjectWriter writer)
+        => WriteAnalyzerReferenceTo(reference, writer);
 
-    private AnalyzerReference DeserializeAnalyzerReference(ObjectReader reader, CancellationToken cancellationToken)
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return ReadAnalyzerReferenceFrom(reader, cancellationToken);
-    }
+    private AnalyzerReference DeserializeAnalyzerReference(ObjectReader reader)
+        => ReadAnalyzerReferenceFrom(reader);
 }