Using Source Generator, instead of GenAPI to produce NotSupported library

build.proj

@@ -461,6 +461,35 @@
     <Exec ConsoleToMsBuild="true" Command="$(DotnetCommand)" />
   </Target>
 
+  <Target Name="BuildSqlClientNotSupportedSG"
+          DependsOnTargets="BuildSqlClientRef">
+
+    <PropertyGroup>
+      <DotnetCommand>
+        "$(DotnetPath)dotnet" build "$(SqlClientNotSupportedProjectPath)"
+        -v:minimal
+        -p:Configuration=$(Configuration)
+        -p:NotSupportedSG=true
+        $(SigningKeyPathArgument)
+
+        <!-- Versioning arguments -->
+        $(BuildNumberArgument)
+        $(BuildSuffixArgument)
+        $(PackageVersionSqlClientArgument)
+
+        <!-- Reference Type Arguments -->
+        $(ReferenceTypeArgument)
+        $(PackageVersionAbstractionsArgument)
+        $(PackageVersionLoggingArgument)
+      </DotnetCommand>
+      <!-- Convert more than one whitespace character into one space -->
+      <DotnetCommand>$([System.Text.RegularExpressions.Regex]::Replace($(DotnetCommand), "\s+", " "))</DotnetCommand>
+    </PropertyGroup>
+
+    <Message Text=">>> Building source generated not supported binaries project via command: '$(DotnetCommand)'"/>
+    <Exec ConsoleToMsBuild="true" Command="$(DotnetCommand)" />
+  </Target>
+
   <!-- BuildSqlClientRef: Builds the ref binaries project for SqlClient, which is OS-agnostic -->
   <PropertyGroup>
     <BuildSqlClientRefDependsOn Condition="'$(ReferenceType.ToLower())' == 'package' AND '$(SkipDependencyPack)' != 'true'">PackLogging;PackAbstractions;PackSqlServer</BuildSqlClientRefDependsOn>

src/Microsoft.Data.SqlClient.slnx

@@ -160,6 +160,7 @@
     <Project Path="../tools/GenAPI/Microsoft.DotNet.GenAPI/Microsoft.DotNet.GenAPI.csproj">
       <Build Project="false" />
     </Project>
+    <Project Path="../tools/GenAPI/Microsoft.Data.SqlClient.SourceGenerator/Microsoft.Data.SqlClient.SourceGenerator.csproj" />
     <Project Path="Microsoft.Data.SqlClient/notsupported/Microsoft.Data.SqlClient.csproj">
       <Build Project="false" />
     </Project>

src/Microsoft.Data.SqlClient/notsupported/Microsoft.Data.SqlClient.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <!--
     Everybody hold onto your pants because this is going to get a bit ugly.
 
@@ -70,6 +70,8 @@
 
     <!-- Disable obsolete member usage warning -->
     <NoWarn>$(NoWarn);CS0618</NoWarn>
+
+    <DefineConstants Condition="'$(NotSupportedSG)' == 'true'">$(DefineConstants);NOTSUPPORTED</DefineConstants>
   </PropertyGroup>
 
   <!-- Versioning ====================================================== -->
@@ -94,6 +96,7 @@
       nice to have a flatter directory structure, it's more hassle than its worth.
     -->
     <OutputPath>$(RepoRoot)artifacts/$(AssemblyName).notsupported/$(ReferenceType)-$(Configuration)/</OutputPath>
+    <OutputPath Condition="'$(NotSupportedSG)' == 'true'">$(RepoRoot)artifacts/$(AssemblyName).notsupported/$(ReferenceType)-$(Configuration)-SG/</OutputPath>
   </PropertyGroup>
 
   <!-- References ====================================================== -->
@@ -185,10 +188,20 @@
 
   <!-- Generate "Not Supported" Source ================================= -->
   <PropertyGroup>
-    <NotSupportedSourceFile>$(AssemblyName).$(TargetFramework).notsupported.cs</NotSupportedSourceFile>
+    <NotSupportedSourceFile Condition="'$(NotSupportedSG)' != 'true'">$(AssemblyName).$(TargetFramework).notsupported.cs</NotSupportedSourceFile>
+    <NotSupportedSourceFile Condition="'$(NotSupportedSG)' == 'true'">Microsoft.Data.SqlClient.SourceGenerator/Microsoft.Data.SqlClient.SourceGenerator.RefToNotSupportedGenerator/$(AssemblyName).$(TargetFramework).notsupported.g.cs</NotSupportedSourceFile>
   </PropertyGroup>
 
+  <Target Name="BuildAndCompare"
+          Condition="'$(NotSupportedSG)' == 'true'"
+          BeforeTargets="CoreCompile">
+    <ItemGroup>
+      <Compile Include="$(NotSupportedSourceFile)" />
+    </ItemGroup>
+  </Target>
+
   <Target Name="GenerateNotSupportedSource"
+          Condition="'$(NotSupportedSG)' != 'true'"
           BeforeTargets="CoreCompile"
           DependsOnTargets="ResolveReferences">
 

src/Microsoft.Data.SqlClient/ref/Microsoft.Data.SqlClient.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <!-- General Properties ============================================== -->
   <PropertyGroup>
     <AssemblyName>Microsoft.Data.SqlClient</AssemblyName>
@@ -8,6 +8,8 @@
   <!-- Compiler Options ================================================ -->
   <PropertyGroup>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
+    <CompilerGeneratedFilesOutputPath>../notsupported</CompilerGeneratedFilesOutputPath>
   </PropertyGroup>
 
   <!-- Versioning ====================================================== -->
@@ -21,6 +23,10 @@
     <Version>$(SqlClientPackageVersion)</Version>
   </PropertyGroup>
 
+  <ItemGroup>
+    <CompilerVisibleProperty Include="TargetFramework" />
+  </ItemGroup>
+
   <!-- CLS Compliance ================================================== -->
   <ItemGroup>
     <AssemblyAttribute Include="System.CLSCompliantAttribute">
@@ -91,6 +97,10 @@
   <ItemGroup>
     <ProjectReference Include="$(RepoRoot)src/Microsoft.Data.SqlClient.Extensions/Abstractions/src/Abstractions.csproj"
                       Condition="'$(ReferenceType)' != 'Package'" />
+    <ProjectReference Include="../../../tools/GenAPI/Microsoft.Data.SqlClient.SourceGenerator/Microsoft.Data.SqlClient.SourceGenerator.csproj">
+      <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
+      <OutputItemType>Analyzer</OutputItemType>
+    </ProjectReference>
     <PackageReference Include="Microsoft.Data.SqlClient.Extensions.Abstractions"
                       Condition="'$(ReferenceType)' == 'Package'" />
   </ItemGroup>

tools/Directory.Packages.props

@@ -1,18 +1,19 @@
 <Project>
-    <PropertyGroup>
-        <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
-    </PropertyGroup>
-    <!-- Tools dependencies -->
-    <ItemGroup>
-        <PackageVersion Include="McMaster.Extensions.CommandLineUtils" Version="2.3.0" />
-        <PackageVersion Include="Microsoft.Cci" Version="4.0.0-rc3-24214-00" />
-        <PackageVersion Include="System.Composition" Version="10.0.5" />
-        <PackageVersion Include="System.Diagnostics.Contracts" Version="4.3.0" />
-        <PackageVersion Include="System.Diagnostics.TextWriterTraceListener" Version="4.3.0" />
-        <PackageVersion Include="System.Diagnostics.TraceSource" Version="4.3.0" />
-        <PackageVersion Include="System.IO.FileSystem" Version="4.3.0" />
-        <PackageVersion Include="System.Memory" Version="4.6.3" />
-        <PackageVersion Include="System.Reflection.Metadata" Version="10.0.3" />
-        <PackageVersion Include="System.Private.Uri" Version="4.3.2" />
-    </ItemGroup>
+  <PropertyGroup>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+  </PropertyGroup>
+  <!-- Tools dependencies -->
+  <ItemGroup>
+    <PackageVersion Include="McMaster.Extensions.CommandLineUtils" Version="2.3.0" />
+    <PackageVersion Include="Microsoft.Cci" Version="4.0.0-rc3-24214-00" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.14.0" />
+    <PackageVersion Include="System.Composition" Version="10.0.5" />
+    <PackageVersion Include="System.Diagnostics.Contracts" Version="4.3.0" />
+    <PackageVersion Include="System.Diagnostics.TextWriterTraceListener" Version="4.3.0" />
+    <PackageVersion Include="System.Diagnostics.TraceSource" Version="4.3.0" />
+    <PackageVersion Include="System.IO.FileSystem" Version="4.3.0" />
+    <PackageVersion Include="System.Memory" Version="4.6.3" />
+    <PackageVersion Include="System.Reflection.Metadata" Version="10.0.3" />
+    <PackageVersion Include="System.Private.Uri" Version="4.3.2" />
+  </ItemGroup>
 </Project>

tools/GenAPI/Microsoft.Data.SqlClient.SourceGenerator/Microsoft.Data.SqlClient.SourceGenerator.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <IsRoslynComponent>true</IsRoslynComponent>
+    <IncludeBuildOutput>false</IncludeBuildOutput>
+    <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <DefineConstants>$(DefineConstants);GENAPI_COMPAT</DefineConstants>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" />
+  </ItemGroup>
+
+</Project>

tools/GenAPI/Microsoft.Data.SqlClient.SourceGenerator/Properties/launchSettings.json

@@ -0,0 +1,8 @@
+{
+  "profiles": {
+    "Debug SG": {
+      "commandName": "DebugRoslynComponent",
+      "targetProject": "..\\..\\..\\src\\Microsoft.Data.SqlClient\\ref\\Microsoft.Data.SqlClient.csproj"
+    }
+  }
+}

tools/GenAPI/Microsoft.Data.SqlClient.SourceGenerator/RefToNotSupportedGenerator.cs

@@ -0,0 +1,105 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace Microsoft.Data.SqlClient.SourceGenerator
+{
+    [Generator]
+    public class RefToNotSupportedGenerator : IIncrementalGenerator
+    {
+        private const string DefaultFileHeader =
+        "//------------------------------------------------------------------------------\r\n" +
+        "// <auto-generated>\r\n" +
+        "//     This code was generated by a tool.\r\n" +
+        "//     {0}\r\n" +
+        "//\r\n" +
+        "//     Changes to this file may cause incorrect behavior and will be lost if\r\n" +
+        "//     the code is regenerated.\r\n" +
+        "// </auto-generated>\r\n" +
+        "//------------------------------------------------------------------------------\r\n";
+
+        public void Initialize(IncrementalGeneratorInitializationContext context)
+        {
+            IncrementalValuesProvider<SyntaxNode> modelsProvider = context.SyntaxProvider
+                .CreateSyntaxProvider(
+                    predicate: (s, _) => IsSyntaxTargetForGeneration(s), 
+                    transform: (ctx, _) => ctx.Node)
+                .Where(m => m != null); // Filter out errors that we don't care about
+
+            var modelProvider = modelsProvider
+                .Collect()
+                .Combine(context.AnalyzerConfigOptionsProvider);
+
+            context.RegisterSourceOutput(
+                modelProvider,
+                (ctx, compilation) =>
+                {
+                    StringBuilder sb = new StringBuilder();
+                    sb.AppendFormat(DefaultFileHeader, nameof(RefToNotSupportedGenerator));
+                    using (StringWriter writer = new StringWriter(sb))
+                    {
+                        if (!compilation.Right.GlobalOptions.TryGetValue("build_property.targetframework", out string framework))
+                        {
+                            throw new KeyNotFoundException("build_property.targetframework");
+                        }
+
+                        try
+                        {
+                            sb.AppendLine("using System;");
+                            sb.AppendLine("#if NOTSUPPORTED");
+
+                            RefToNotsupportedTypeRewriter visitor = new RefToNotsupportedTypeRewriter();
+                            // Group all collected types by namespace. Expects source file name from ref library to match namespace of all incuded types  
+                            foreach (var group in compilation.Left
+                                .GroupBy(c => c.GetLocation().SourceTree.FilePath)
+                                .OrderBy(cg => cg.Key)
+                            )
+                            {
+
+                                sb.Append("namespace ");
+                                sb.AppendLine(Path.GetFileNameWithoutExtension(group.Key));
+                                sb.AppendLine("{");
+                                foreach (SyntaxNode model in group)
+                                {
+                                    SyntaxNode result = visitor.Visit(model);
+                                    result.WriteTo(writer);
+                                }
+                                sb.AppendLine("}");
+                            }
+
+                            sb.AppendLine("#endif");
+
+                        }
+                        catch (Exception ex)
+                        {
+                            sb.AppendLine($"// Exception:  {ex.Message}\r\n// StackTrace: {ex.StackTrace}");
+                        }
+
+                        ctx.AddSource($"Microsoft.Data.SqlClient.{framework}.notsupported.g.cs", sb.ToString());
+                    }
+                });
+        }
+
+        private static bool IsSyntaxTargetForGeneration(SyntaxNode node)
+        {
+            // Public delegates
+            if (node is DelegateDeclarationSyntax membDecl && membDecl.Modifiers.Any(SyntaxKind.PublicKeyword))
+            {
+                return true;
+            }
+            // Public, or internal types
+            if (node is BaseTypeDeclarationSyntax typeDecl &&
+                (typeDecl.Modifiers.Any(SyntaxKind.PublicKeyword) || typeDecl.Modifiers.Any(SyntaxKind.InternalKeyword)))
+            {
+                return true;
+            }
+
+            return false;
+        }
+    }
+}