initial commit, 4.5 stable

modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/CallbacksInfo.cs

@@ -0,0 +1,24 @@
+using System.Collections.Immutable;
+using System.Linq;
+using Microsoft.CodeAnalysis;
+
+namespace Godot.SourceGenerators.Internal;
+
+internal readonly struct CallbacksData
+{
+    public CallbacksData(INamedTypeSymbol nativeTypeSymbol, INamedTypeSymbol funcStructSymbol)
+    {
+        NativeTypeSymbol = nativeTypeSymbol;
+        FuncStructSymbol = funcStructSymbol;
+        Methods = NativeTypeSymbol.GetMembers()
+            .Where(symbol => symbol is IMethodSymbol { IsPartialDefinition: true })
+            .Cast<IMethodSymbol>()
+            .ToImmutableArray();
+    }
+
+    public INamedTypeSymbol NativeTypeSymbol { get; }
+
+    public INamedTypeSymbol FuncStructSymbol { get; }
+
+    public ImmutableArray<IMethodSymbol> Methods { get; }
+}

modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/Common.cs

@@ -0,0 +1,65 @@
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace Godot.SourceGenerators.Internal;
+
+internal static class Common
+{
+    public static void ReportNonPartialUnmanagedCallbacksClass(
+        GeneratorExecutionContext context,
+        ClassDeclarationSyntax cds, INamedTypeSymbol symbol
+    )
+    {
+        string message =
+            "Missing partial modifier on declaration of type '" +
+            $"{symbol.FullQualifiedNameOmitGlobal()}' which has attribute '{GeneratorClasses.GenerateUnmanagedCallbacksAttr}'";
+
+        string description = $"{message}. Classes with attribute '{GeneratorClasses.GenerateUnmanagedCallbacksAttr}' " +
+                             "must be declared with the partial modifier.";
+
+        context.ReportDiagnostic(Diagnostic.Create(
+            new DiagnosticDescriptor(id: "GODOT-INTERNAL-G0001",
+                title: message,
+                messageFormat: message,
+                category: "Usage",
+                DiagnosticSeverity.Error,
+                isEnabledByDefault: true,
+                description),
+            cds.GetLocation(),
+            cds.SyntaxTree.FilePath));
+    }
+
+    public static void ReportNonPartialUnmanagedCallbacksOuterClass(
+        GeneratorExecutionContext context,
+        TypeDeclarationSyntax outerTypeDeclSyntax
+    )
+    {
+        var outerSymbol = context.Compilation
+            .GetSemanticModel(outerTypeDeclSyntax.SyntaxTree)
+            .GetDeclaredSymbol(outerTypeDeclSyntax);
+
+        string fullQualifiedName = outerSymbol is INamedTypeSymbol namedTypeSymbol ?
+            namedTypeSymbol.FullQualifiedNameOmitGlobal() :
+            "type not found";
+
+        string message =
+            $"Missing partial modifier on declaration of type '{fullQualifiedName}', " +
+            $"which contains one or more subclasses with attribute " +
+            $"'{GeneratorClasses.GenerateUnmanagedCallbacksAttr}'";
+
+        string description = $"{message}. Classes with attribute " +
+                             $"'{GeneratorClasses.GenerateUnmanagedCallbacksAttr}' and their " +
+                             "containing types must be declared with the partial modifier.";
+
+        context.ReportDiagnostic(Diagnostic.Create(
+            new DiagnosticDescriptor(id: "GODOT-INTERNAL-G0002",
+                title: message,
+                messageFormat: message,
+                category: "Usage",
+                DiagnosticSeverity.Error,
+                isEnabledByDefault: true,
+                description),
+            outerTypeDeclSyntax.GetLocation(),
+            outerTypeDeclSyntax.SyntaxTree.FilePath));
+    }
+}

modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/ExtensionMethods.cs

@@ -0,0 +1,124 @@
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace Godot.SourceGenerators.Internal;
+
+internal static class ExtensionMethods
+{
+    public static AttributeData? GetGenerateUnmanagedCallbacksAttribute(this INamedTypeSymbol symbol)
+        => symbol.GetAttributes()
+            .FirstOrDefault(a => a.AttributeClass?.IsGenerateUnmanagedCallbacksAttribute() ?? false);
+
+    private static bool HasGenerateUnmanagedCallbacksAttribute(
+        this ClassDeclarationSyntax cds, Compilation compilation,
+        out INamedTypeSymbol? symbol
+    )
+    {
+        var sm = compilation.GetSemanticModel(cds.SyntaxTree);
+
+        var classTypeSymbol = sm.GetDeclaredSymbol(cds);
+        if (classTypeSymbol == null)
+        {
+            symbol = null;
+            return false;
+        }
+
+        if (!classTypeSymbol.GetAttributes()
+                .Any(a => a.AttributeClass?.IsGenerateUnmanagedCallbacksAttribute() ?? false))
+        {
+            symbol = null;
+            return false;
+        }
+
+        symbol = classTypeSymbol;
+        return true;
+    }
+
+    private static bool IsGenerateUnmanagedCallbacksAttribute(this INamedTypeSymbol symbol)
+        => symbol.FullQualifiedNameOmitGlobal() == GeneratorClasses.GenerateUnmanagedCallbacksAttr;
+
+    public static IEnumerable<(ClassDeclarationSyntax cds, INamedTypeSymbol symbol)> SelectUnmanagedCallbacksClasses(
+        this IEnumerable<ClassDeclarationSyntax> source,
+        Compilation compilation
+    )
+    {
+        foreach (var cds in source)
+        {
+            if (cds.HasGenerateUnmanagedCallbacksAttribute(compilation, out var symbol))
+                yield return (cds, symbol!);
+        }
+    }
+
+    public static bool IsNested(this TypeDeclarationSyntax cds)
+        => cds.Parent is TypeDeclarationSyntax;
+
+    public static bool IsPartial(this TypeDeclarationSyntax cds)
+        => cds.Modifiers.Any(SyntaxKind.PartialKeyword);
+
+    public static bool AreAllOuterTypesPartial(
+        this TypeDeclarationSyntax cds,
+        out TypeDeclarationSyntax? typeMissingPartial
+    )
+    {
+        SyntaxNode? outerSyntaxNode = cds.Parent;
+
+        while (outerSyntaxNode is TypeDeclarationSyntax outerTypeDeclSyntax)
+        {
+            if (!outerTypeDeclSyntax.IsPartial())
+            {
+                typeMissingPartial = outerTypeDeclSyntax;
+                return false;
+            }
+
+            outerSyntaxNode = outerSyntaxNode.Parent;
+        }
+
+        typeMissingPartial = null;
+        return true;
+    }
+
+    public static string GetDeclarationKeyword(this INamedTypeSymbol namedTypeSymbol)
+    {
+        string? keyword = namedTypeSymbol.DeclaringSyntaxReferences
+            .OfType<TypeDeclarationSyntax>().FirstOrDefault()?
+            .Keyword.Text;
+
+        return keyword ?? namedTypeSymbol.TypeKind switch
+        {
+            TypeKind.Interface => "interface",
+            TypeKind.Struct => "struct",
+            _ => "class"
+        };
+    }
+
+    private static SymbolDisplayFormat FullyQualifiedFormatOmitGlobal { get; } =
+        SymbolDisplayFormat.FullyQualifiedFormat
+            .WithGlobalNamespaceStyle(SymbolDisplayGlobalNamespaceStyle.Omitted);
+
+    private static SymbolDisplayFormat FullyQualifiedFormatIncludeGlobal { get; } =
+        SymbolDisplayFormat.FullyQualifiedFormat
+            .WithGlobalNamespaceStyle(SymbolDisplayGlobalNamespaceStyle.Included);
+
+    public static string FullQualifiedNameOmitGlobal(this ITypeSymbol symbol)
+        => symbol.ToDisplayString(NullableFlowState.NotNull, FullyQualifiedFormatOmitGlobal);
+
+    public static string FullQualifiedNameOmitGlobal(this INamespaceSymbol namespaceSymbol)
+        => namespaceSymbol.ToDisplayString(FullyQualifiedFormatOmitGlobal);
+
+    public static string FullQualifiedNameIncludeGlobal(this ITypeSymbol symbol)
+        => symbol.ToDisplayString(NullableFlowState.NotNull, FullyQualifiedFormatIncludeGlobal);
+
+    public static string FullQualifiedNameIncludeGlobal(this INamespaceSymbol namespaceSymbol)
+        => namespaceSymbol.ToDisplayString(FullyQualifiedFormatIncludeGlobal);
+
+    public static string SanitizeQualifiedNameForUniqueHint(this string qualifiedName)
+        => qualifiedName
+            // AddSource() doesn't support @ prefix
+            .Replace("@", "")
+            // AddSource() doesn't support angle brackets
+            .Replace("<", "(Of ")
+            .Replace(">", ")");
+}

modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/GeneratorClasses.cs

@@ -0,0 +1,6 @@
+namespace Godot.SourceGenerators.Internal;
+
+internal static class GeneratorClasses
+{
+    public const string GenerateUnmanagedCallbacksAttr = "Godot.SourceGenerators.Internal.GenerateUnmanagedCallbacksAttribute";
+}

modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/Godot.SourceGenerators.Internal.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>10</LangVersion>
+    <Nullable>enable</Nullable>
+    <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" PrivateAssets="all" />
+  </ItemGroup>
+
+</Project>

modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/UnmanagedCallbacksGenerator.cs

@@ -0,0 +1,478 @@
+using System.Text;
+using System.Linq;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Text;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace Godot.SourceGenerators.Internal;
+
+[Generator]
+public class UnmanagedCallbacksGenerator : ISourceGenerator
+{
+    public void Initialize(GeneratorInitializationContext context)
+    {
+        context.RegisterForPostInitialization(ctx => { GenerateAttribute(ctx); });
+    }
+
+    public void Execute(GeneratorExecutionContext context)
+    {
+        INamedTypeSymbol[] unmanagedCallbacksClasses = context
+            .Compilation.SyntaxTrees
+            .SelectMany(tree =>
+                tree.GetRoot().DescendantNodes()
+                    .OfType<ClassDeclarationSyntax>()
+                    .SelectUnmanagedCallbacksClasses(context.Compilation)
+                    // Report and skip non-partial classes
+                    .Where(x =>
+                    {
+                        if (x.cds.IsPartial())
+                        {
+                            if (x.cds.IsNested() && !x.cds.AreAllOuterTypesPartial(out var typeMissingPartial))
+                            {
+                                Common.ReportNonPartialUnmanagedCallbacksOuterClass(context, typeMissingPartial!);
+                                return false;
+                            }
+
+                            return true;
+                        }
+
+                        Common.ReportNonPartialUnmanagedCallbacksClass(context, x.cds, x.symbol);
+                        return false;
+                    })
+                    .Select(x => x.symbol)
+            )
+            .Distinct<INamedTypeSymbol>(SymbolEqualityComparer.Default)
+            .ToArray();
+
+        foreach (var symbol in unmanagedCallbacksClasses)
+        {
+            var attr = symbol.GetGenerateUnmanagedCallbacksAttribute();
+            if (attr == null || attr.ConstructorArguments.Length != 1)
+            {
+                // TODO: Report error or throw exception, this is an invalid case and should never be reached
+                System.Diagnostics.Debug.Fail("FAILED!");
+                continue;
+            }
+
+            var funcStructType = (INamedTypeSymbol?)attr.ConstructorArguments[0].Value;
+            if (funcStructType == null)
+            {
+                // TODO: Report error or throw exception, this is an invalid case and should never be reached
+                System.Diagnostics.Debug.Fail("FAILED!");
+                continue;
+            }
+
+            var data = new CallbacksData(symbol, funcStructType);
+            GenerateInteropMethodImplementations(context, data);
+            GenerateUnmanagedCallbacksStruct(context, data);
+        }
+    }
+
+    private void GenerateAttribute(GeneratorPostInitializationContext context)
+    {
+        string source = @"using System;
+
+namespace Godot.SourceGenerators.Internal
+{
+internal class GenerateUnmanagedCallbacksAttribute : Attribute
+{
+    public Type FuncStructType { get; }
+
+    public GenerateUnmanagedCallbacksAttribute(Type funcStructType)
+    {
+        FuncStructType = funcStructType;
+    }
+}
+}";
+
+        context.AddSource("GenerateUnmanagedCallbacksAttribute.generated",
+            SourceText.From(source, Encoding.UTF8));
+    }
+
+    private void GenerateInteropMethodImplementations(GeneratorExecutionContext context, CallbacksData data)
+    {
+        var symbol = data.NativeTypeSymbol;
+
+        INamespaceSymbol namespaceSymbol = symbol.ContainingNamespace;
+        string classNs = namespaceSymbol != null && !namespaceSymbol.IsGlobalNamespace ?
+            namespaceSymbol.FullQualifiedNameOmitGlobal() :
+            string.Empty;
+        bool hasNamespace = classNs.Length != 0;
+        bool isInnerClass = symbol.ContainingType != null;
+
+        var source = new StringBuilder();
+        var methodSource = new StringBuilder();
+        var methodCallArguments = new StringBuilder();
+        var methodSourceAfterCall = new StringBuilder();
+
+        source.Append(
+            @"using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using Godot.Bridge;
+using Godot.NativeInterop;
+
+#pragma warning disable CA1707 // Disable warning: Identifiers should not contain underscores
+
+");
+
+        if (hasNamespace)
+        {
+            source.Append("namespace ");
+            source.Append(classNs);
+            source.Append("\n{\n");
+        }
+
+        if (isInnerClass)
+        {
+            var containingType = symbol.ContainingType;
+            AppendPartialContainingTypeDeclarations(containingType);
+
+            void AppendPartialContainingTypeDeclarations(INamedTypeSymbol? containingType)
+            {
+                if (containingType == null)
+                    return;
+
+                AppendPartialContainingTypeDeclarations(containingType.ContainingType);
+
+                source.Append("partial ");
+                source.Append(containingType.GetDeclarationKeyword());
+                source.Append(" ");
+                source.Append(containingType.ToDisplayString(SymbolDisplayFormat.MinimallyQualifiedFormat));
+                source.Append("\n{\n");
+            }
+        }
+
+        source.Append("[System.Runtime.CompilerServices.SkipLocalsInit]\n");
+        source.Append($"unsafe partial class {symbol.Name}\n");
+        source.Append("{\n");
+        source.Append($"    private static {data.FuncStructSymbol.FullQualifiedNameIncludeGlobal()} _unmanagedCallbacks;\n\n");
+
+        foreach (var callback in data.Methods)
+        {
+            methodSource.Clear();
+            methodCallArguments.Clear();
+            methodSourceAfterCall.Clear();
+
+            source.Append("    [global::System.Runtime.CompilerServices.MethodImpl(global::System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]\n");
+            source.Append($"    {SyntaxFacts.GetText(callback.DeclaredAccessibility)} ");
+
+            if (callback.IsStatic)
+                source.Append("static ");
+
+            source.Append("partial ");
+            source.Append(callback.ReturnType.FullQualifiedNameIncludeGlobal());
+            source.Append(' ');
+            source.Append(callback.Name);
+            source.Append('(');
+
+            for (int i = 0; i < callback.Parameters.Length; i++)
+            {
+                var parameter = callback.Parameters[i];
+
+                AppendRefKind(source, parameter.RefKind, parameter.ScopedKind);
+                source.Append(' ');
+                source.Append(parameter.Type.FullQualifiedNameIncludeGlobal());
+                source.Append(' ');
+                source.Append(parameter.Name);
+
+                if (parameter.RefKind == RefKind.Out)
+                {
+                    // Only assign default if the parameter won't be passed by-ref or copied later.
+                    if (IsGodotInteropStruct(parameter.Type))
+                        methodSource.Append($"        {parameter.Name} = default;\n");
+                }
+
+                if (IsByRefParameter(parameter))
+                {
+                    if (IsGodotInteropStruct(parameter.Type))
+                    {
+                        methodSource.Append("        ");
+                        AppendCustomUnsafeAsPointer(methodSource, parameter, out string varName);
+                        methodCallArguments.Append(varName);
+                    }
+                    else if (parameter.Type.IsValueType)
+                    {
+                        methodSource.Append("        ");
+                        AppendCopyToStackAndGetPointer(methodSource, parameter, out string varName);
+                        methodCallArguments.Append($"&{varName}");
+
+                        if (parameter.RefKind is RefKind.Out or RefKind.Ref)
+                        {
+                            methodSourceAfterCall.Append($"        {parameter.Name} = {varName};\n");
+                        }
+                    }
+                    else
+                    {
+                        // If it's a by-ref param and we can't get the pointer
+                        // just pass it by-ref and let it be pinned.
+                        AppendRefKind(methodCallArguments, parameter.RefKind, parameter.ScopedKind)
+                            .Append(' ')
+                            .Append(parameter.Name);
+                    }
+                }
+                else
+                {
+                    methodCallArguments.Append(parameter.Name);
+                }
+
+                if (i < callback.Parameters.Length - 1)
+                {
+                    source.Append(", ");
+                    methodCallArguments.Append(", ");
+                }
+            }
+
+            source.Append(")\n");
+            source.Append("    {\n");
+
+            source.Append(methodSource);
+            source.Append("        ");
+
+            if (!callback.ReturnsVoid)
+            {
+                if (methodSourceAfterCall.Length != 0)
+                    source.Append($"{callback.ReturnType.FullQualifiedNameIncludeGlobal()} ret = ");
+                else
+                    source.Append("return ");
+            }
+
+            source.Append($"_unmanagedCallbacks.{callback.Name}(");
+            source.Append(methodCallArguments);
+            source.Append(");\n");
+
+            if (methodSourceAfterCall.Length != 0)
+            {
+                source.Append(methodSourceAfterCall);
+
+                if (!callback.ReturnsVoid)
+                    source.Append("        return ret;\n");
+            }
+
+            source.Append("    }\n\n");
+        }
+
+        source.Append("}\n");
+
+        if (isInnerClass)
+        {
+            var containingType = symbol.ContainingType;
+
+            while (containingType != null)
+            {
+                source.Append("}\n"); // outer class
+
+                containingType = containingType.ContainingType;
+            }
+        }
+
+        if (hasNamespace)
+            source.Append("\n}");
+
+        source.Append("\n\n#pragma warning restore CA1707\n");
+
+        context.AddSource($"{data.NativeTypeSymbol.FullQualifiedNameOmitGlobal().SanitizeQualifiedNameForUniqueHint()}.generated",
+            SourceText.From(source.ToString(), Encoding.UTF8));
+    }
+
+    private void GenerateUnmanagedCallbacksStruct(GeneratorExecutionContext context, CallbacksData data)
+    {
+        var symbol = data.FuncStructSymbol;
+
+        INamespaceSymbol namespaceSymbol = symbol.ContainingNamespace;
+        string classNs = namespaceSymbol != null && !namespaceSymbol.IsGlobalNamespace ?
+            namespaceSymbol.FullQualifiedNameOmitGlobal() :
+            string.Empty;
+        bool hasNamespace = classNs.Length != 0;
+        bool isInnerClass = symbol.ContainingType != null;
+
+        var source = new StringBuilder();
+
+        source.Append(
+            @"using System.Runtime.InteropServices;
+using Godot.NativeInterop;
+
+#pragma warning disable CA1707 // Disable warning: Identifiers should not contain underscores
+
+");
+        if (hasNamespace)
+        {
+            source.Append("namespace ");
+            source.Append(classNs);
+            source.Append("\n{\n");
+        }
+
+        if (isInnerClass)
+        {
+            var containingType = symbol.ContainingType;
+            AppendPartialContainingTypeDeclarations(containingType);
+
+            void AppendPartialContainingTypeDeclarations(INamedTypeSymbol? containingType)
+            {
+                if (containingType == null)
+                    return;
+
+                AppendPartialContainingTypeDeclarations(containingType.ContainingType);
+
+                source.Append("partial ");
+                source.Append(containingType.GetDeclarationKeyword());
+                source.Append(" ");
+                source.Append(containingType.ToDisplayString(SymbolDisplayFormat.MinimallyQualifiedFormat));
+                source.Append("\n{\n");
+            }
+        }
+
+        source.Append("[StructLayout(LayoutKind.Sequential)]\n");
+        source.Append($"unsafe partial struct {symbol.Name}\n{{\n");
+
+        foreach (var callback in data.Methods)
+        {
+            source.Append("    ");
+            source.Append(callback.DeclaredAccessibility == Accessibility.Public ? "public " : "internal ");
+
+            source.Append("delegate* unmanaged<");
+
+            foreach (var parameter in callback.Parameters)
+            {
+                if (IsByRefParameter(parameter))
+                {
+                    if (IsGodotInteropStruct(parameter.Type) || parameter.Type.IsValueType)
+                    {
+                        AppendPointerType(source, parameter.Type);
+                    }
+                    else
+                    {
+                        // If it's a by-ref param and we can't get the pointer
+                        // just pass it by-ref and let it be pinned.
+                        AppendRefKind(source, parameter.RefKind, parameter.ScopedKind)
+                            .Append(' ')
+                            .Append(parameter.Type.FullQualifiedNameIncludeGlobal());
+                    }
+                }
+                else
+                {
+                    source.Append(parameter.Type.FullQualifiedNameIncludeGlobal());
+                }
+
+                source.Append(", ");
+            }
+
+            source.Append(callback.ReturnType.FullQualifiedNameIncludeGlobal());
+            source.Append($"> {callback.Name};\n");
+        }
+
+        source.Append("}\n");
+
+        if (isInnerClass)
+        {
+            var containingType = symbol.ContainingType;
+
+            while (containingType != null)
+            {
+                source.Append("}\n"); // outer class
+
+                containingType = containingType.ContainingType;
+            }
+        }
+
+        if (hasNamespace)
+            source.Append("}\n");
+
+        source.Append("\n#pragma warning restore CA1707\n");
+
+        context.AddSource($"{symbol.FullQualifiedNameOmitGlobal().SanitizeQualifiedNameForUniqueHint()}.generated",
+            SourceText.From(source.ToString(), Encoding.UTF8));
+    }
+
+    private static bool IsGodotInteropStruct(ITypeSymbol type) =>
+        _godotInteropStructs.Contains(type.FullQualifiedNameOmitGlobal());
+
+    private static bool IsByRefParameter(IParameterSymbol parameter) =>
+        parameter.RefKind is RefKind.In or RefKind.Out or RefKind.Ref;
+
+    private static StringBuilder AppendRefKind(StringBuilder source, RefKind refKind, ScopedKind scopedKind)
+    {
+        return (refKind, scopedKind) switch
+        {
+            (RefKind.Out, _) => source.Append("out"),
+            (RefKind.In, ScopedKind.ScopedRef) => source.Append("scoped in"),
+            (RefKind.In, _) => source.Append("in"),
+            (RefKind.Ref, ScopedKind.ScopedRef) => source.Append("scoped ref"),
+            (RefKind.Ref, _) => source.Append("ref"),
+            _ => source,
+        };
+    }
+
+    private static void AppendPointerType(StringBuilder source, ITypeSymbol type)
+    {
+        source.Append(type.FullQualifiedNameIncludeGlobal());
+        source.Append('*');
+    }
+
+    private static void AppendCustomUnsafeAsPointer(StringBuilder source, IParameterSymbol parameter,
+        out string varName)
+    {
+        varName = $"{parameter.Name}_ptr";
+
+        AppendPointerType(source, parameter.Type);
+        source.Append(' ');
+        source.Append(varName);
+        source.Append(" = ");
+
+        source.Append('(');
+        AppendPointerType(source, parameter.Type);
+        source.Append(')');
+
+        if (parameter.RefKind == RefKind.In)
+            source.Append("CustomUnsafe.ReadOnlyRefAsPointer(in ");
+        else
+            source.Append("CustomUnsafe.AsPointer(ref ");
+
+        source.Append(parameter.Name);
+
+        source.Append(");\n");
+    }
+
+    private static void AppendCopyToStackAndGetPointer(StringBuilder source, IParameterSymbol parameter,
+        out string varName)
+    {
+        varName = $"{parameter.Name}_copy";
+
+        source.Append(parameter.Type.FullQualifiedNameIncludeGlobal());
+        source.Append(' ');
+        source.Append(varName);
+        if (parameter.RefKind is RefKind.In or RefKind.Ref)
+        {
+            source.Append(" = ");
+            source.Append(parameter.Name);
+        }
+
+        source.Append(";\n");
+    }
+
+    private static readonly string[] _godotInteropStructs =
+    {
+        "Godot.NativeInterop.godot_ref",
+        "Godot.NativeInterop.godot_variant_call_error",
+        "Godot.NativeInterop.godot_variant",
+        "Godot.NativeInterop.godot_string",
+        "Godot.NativeInterop.godot_string_name",
+        "Godot.NativeInterop.godot_node_path",
+        "Godot.NativeInterop.godot_signal",
+        "Godot.NativeInterop.godot_callable",
+        "Godot.NativeInterop.godot_array",
+        "Godot.NativeInterop.godot_dictionary",
+        "Godot.NativeInterop.godot_packed_byte_array",
+        "Godot.NativeInterop.godot_packed_int32_array",
+        "Godot.NativeInterop.godot_packed_int64_array",
+        "Godot.NativeInterop.godot_packed_float32_array",
+        "Godot.NativeInterop.godot_packed_float64_array",
+        "Godot.NativeInterop.godot_packed_string_array",
+        "Godot.NativeInterop.godot_packed_vector2_array",
+        "Godot.NativeInterop.godot_packed_vector3_array",
+        "Godot.NativeInterop.godot_packed_vector4_array",
+        "Godot.NativeInterop.godot_packed_color_array",
+    };
+}