public static (ClassDeclarationSyntax, IGeneratedProxyDescription) Generate(
LibraryTypes libraryTypes,
IInvokableInterfaceDescription interfaceDescription,
MetadataModel metadataModel)
{
var generatedClassName = GetSimpleClassName(interfaceDescription.InterfaceType);
var ctors = GenerateConstructors(generatedClassName, interfaceDescription).ToArray();
var proxyMethods = CreateProxyMethods(libraryTypes, interfaceDescription, metadataModel).ToArray();
var classDeclaration = ClassDeclaration(generatedClassName)
.AddBaseListTypes(
SimpleBaseType(interfaceDescription.ProxyBaseType.ToTypeSyntax()),
SimpleBaseType(interfaceDescription.InterfaceType.ToTypeSyntax()))
.AddModifiers(Token(SyntaxKind.InternalKeyword), Token(SyntaxKind.SealedKeyword))
.AddAttributeLists(
AttributeList(SingletonSeparatedList(CodeGenerator.GetGeneratedCodeAttributeSyntax())))
.AddMembers(ctors)
.AddMembers(proxyMethods);
if (interfaceDescription.InterfaceType.TypeParameters.Length > 0)
{
classDeclaration = AddGenericTypeConstraints(classDeclaration, interfaceDescription.InterfaceType);
}
return(classDeclaration, new GeneratedProxyDescription(interfaceDescription));
}
private static MemberDeclarationSyntax GenerateGetResultProperty(
LibraryTypes libraryTypes,
ResultFieldDescription resultField)
{
var type = IdentifierName("TResult");
var typeToken = Identifier("TResult");
ExpressionSyntax body;
if (resultField != null)
{
body = CastExpression(
type,
CastExpression(libraryTypes.Object.ToTypeSyntax(), ThisExpression().Member(resultField.FieldName)));
}
else
{
body = ThrowExpression(
ObjectCreationExpression(libraryTypes.InvalidOperationException.ToTypeSyntax())
.WithArgumentList(
ArgumentList(
SingletonSeparatedList(
Argument("Method does not have a return value.".GetLiteralExpression())))));
}
return(MethodDeclaration(type, "GetResult")
.WithTypeParameterList(TypeParameterList(SingletonSeparatedList(TypeParameter(typeToken))))
.WithParameterList(ParameterList())
.WithExpressionBody(ArrowExpressionClause(body))
.WithModifiers(TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.OverrideKeyword)))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken)));
}
private static MemberDeclarationSyntax GenerateDisposeMethod(
LibraryTypes libraryTypes,
List <FieldDescription> fields)
{
var body = new List <StatementSyntax>();
foreach (var field in fields)
{
if (!field.IsInjected)
{
body.Add(
ExpressionStatement(
AssignmentExpression(
SyntaxKind.SimpleAssignmentExpression,
ThisExpression().Member(field.FieldName),
DefaultExpression(field.FieldType.ToTypeSyntax()))));
}
}
body.Add(ExpressionStatement(InvocationExpression(libraryTypes.InvokablePool.ToTypeSyntax().Member("Return"))
.WithArgumentList(ArgumentList(SingletonSeparatedList <ArgumentSyntax>(Argument(ThisExpression()))))));
return(MethodDeclaration(libraryTypes.Void.ToTypeSyntax(), "Dispose")
.WithModifiers(TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.OverrideKeyword)))
.WithBody(Block(body)));
}
public SerializableMethodMember(LibraryTypes wellKnownTypes, MethodParameterFieldDescription member, int ordinal)
{
this.member = member;
this.wellKnownTypes = wellKnownTypes;
this.Description = member;
this.ordinal = ordinal;
}
public static ClassDeclarationSyntax GenerateSerializer(Compilation compilation, TypeDescription typeDescription)
{
var type = typeDescription.Type;
var simpleClassName = GetSimpleClassName(type);
var libraryTypes = LibraryTypes.FromCompilation(compilation);
var serializerInterface = type.IsValueType ? libraryTypes.ValueSerializer : libraryTypes.PartialSerializer;
var baseInterface = serializerInterface.Construct(type).ToTypeSyntax();
var fieldDescriptions = GetFieldDescriptions(typeDescription, libraryTypes);
var fields = GetFieldDeclarations(fieldDescriptions);
var ctor = GenerateConstructor(simpleClassName, fieldDescriptions);
var serializeMethod = GenerateSerializeMethod(typeDescription, fieldDescriptions, libraryTypes);
var deserializeMethod = GenerateDeserializeMethod(typeDescription, fieldDescriptions, libraryTypes);
var classDeclaration = ClassDeclaration(simpleClassName)
.AddBaseListTypes(SimpleBaseType(baseInterface))
.AddModifiers(Token(SyntaxKind.InternalKeyword), Token(SyntaxKind.SealedKeyword))
.AddAttributeLists(AttributeList(SingletonSeparatedList(CodeGenerator.GetGeneratedCodeAttributeSyntax())))
.AddMembers(fields)
.AddMembers(ctor, serializeMethod, deserializeMethod);
if (type.IsGenericType)
{
classDeclaration = AddGenericTypeConstraints(classDeclaration, type);
}
return(classDeclaration);
}
private static MemberDeclarationSyntax GenerateResultProperty(
LibraryTypes libraryTypes,
ResultFieldDescription resultField)
{
var getter = AccessorDeclaration(SyntaxKind.GetAccessorDeclaration)
.WithExpressionBody(
ArrowExpressionClause(
CastExpression(
libraryTypes.Object.ToTypeSyntax(),
ThisExpression().Member(resultField.FieldName))))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken));
var setter = AccessorDeclaration(SyntaxKind.SetAccessorDeclaration)
.WithExpressionBody(
ArrowExpressionClause(
AssignmentExpression(
SyntaxKind.SimpleAssignmentExpression,
ThisExpression().Member(resultField.FieldName),
CastExpression(resultField.FieldType.ToTypeSyntax(), IdentifierName("value")))))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken));
return(PropertyDeclaration(libraryTypes.Object.ToTypeSyntax(), "Result")
.WithAccessorList(
AccessorList()
.AddAccessors(
getter,
setter))
.WithModifiers(TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.OverrideKeyword))));
}
public SerializableTypeDescription(SemanticModel semanticModel, INamedTypeSymbol type, IEnumerable <IMemberDescription> members, LibraryTypes libraryTypes)
{
Type = type;
Members = members.ToList();
SemanticModel = semanticModel;
_libraryTypes = libraryTypes;
}
public SerializableMember(LibraryTypes wellKnownTypes, ISerializableTypeDescription type, IMemberDescription member, int ordinal)
{
this.wellKnownTypes = wellKnownTypes;
this.model = type.SemanticModel;
this.Description = member;
this.ordinal = ordinal;
}
private static MemberDeclarationSyntax GenerateSetTargetMethod(
LibraryTypes libraryTypes,
IInvokableInterfaceDescription interfaceDescription,
TargetFieldDescription targetField)
{
var type = IdentifierName("TTargetHolder");
var typeToken = Identifier("TTargetHolder");
var holderParameter = Identifier("holder");
var holder = IdentifierName("holder");
var getTarget = InvocationExpression(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
holder,
GenericName(interfaceDescription.IsExtension ? "GetExtension" : "GetTarget")
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList(interfaceDescription.InterfaceType.ToTypeSyntax())))))
.WithArgumentList(ArgumentList());
var body =
AssignmentExpression(
SyntaxKind.SimpleAssignmentExpression,
ThisExpression().Member(targetField.FieldName),
getTarget);
return(MethodDeclaration(libraryTypes.Void.ToTypeSyntax(), "SetTarget")
.WithTypeParameterList(TypeParameterList(SingletonSeparatedList(TypeParameter(typeToken))))
.WithParameterList(ParameterList(SingletonSeparatedList(Parameter(holderParameter).WithType(type))))
.WithExpressionBody(ArrowExpressionClause(body))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken))
.WithModifiers(TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.OverrideKeyword))));
}
private static MemberDeclarationSyntax GenerateCreateMethod(LibraryTypes libraryTypes, ISerializableTypeDescription type)
{
var createObject = type.GetObjectCreationExpression(libraryTypes);
return(MethodDeclaration(type.TypeSyntax, "Create")
.WithExpressionBody(ArrowExpressionClause(createObject))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken))
.AddModifiers(Token(SyntaxKind.PublicKeyword)));
}
private static BlockSyntax CreateProxyMethodBody(
LibraryTypes libraryTypes,
MetadataModel metadataModel,
IInvokableInterfaceDescription interfaceDescription,
MethodDescription methodDescription)
{
var statements = new List <StatementSyntax>();
// Create request object
var requestVar = IdentifierName("request");
var requestDescription = metadataModel.GeneratedInvokables[methodDescription];
var createRequestExpr = ObjectCreationExpression(requestDescription.TypeSyntax)
.WithArgumentList(ArgumentList(SeparatedList <ArgumentSyntax>()));
statements.Add(
LocalDeclarationStatement(
VariableDeclaration(
ParseTypeName("var"),
SingletonSeparatedList(
VariableDeclarator(
Identifier("request"))
.WithInitializer(
EqualsValueClause(createRequestExpr))))));
// Set request object fields from method parameters.
var parameterIndex = 0;
foreach (var parameter in methodDescription.Method.Parameters)
{
statements.Add(
ExpressionStatement(
AssignmentExpression(
SyntaxKind.SimpleAssignmentExpression,
requestVar.Member($"arg{parameterIndex}"),
IdentifierName(parameter.Name))));
parameterIndex++;
}
// Issue request
statements.Add(
ExpressionStatement(
AwaitExpression(
InvocationExpression(
BaseExpression().Member("Invoke"),
ArgumentList(SingletonSeparatedList(Argument(requestVar)))))));
// Return result
if (methodDescription.Method.ReturnType is INamedTypeSymbol named && named.TypeParameters.Length == 1)
{
statements.Add(ReturnStatement(requestVar.Member("result")));
}
return(Block(statements));
}
private static MemberDeclarationSyntax GenerateSerializeMethod(TypeDescription typeDescription,
List <SerializerFieldDescription> fieldDescriptions,
LibraryTypes libraryTypes)
{
var returnType = PredefinedType(Token(SyntaxKind.VoidKeyword));
var writerParam = "writer".ToIdentifierName();
var sessionParam = "session".ToIdentifierName();
var instanceParam = "instance".ToIdentifierName();
var body = new List <StatementSyntax>();
if (HasComplexBaseType(typeDescription.Type))
{
body.Add(
ExpressionStatement(
InvocationExpression(
ThisExpression().Member(BaseTypeSerializerFieldName.ToIdentifierName()).Member(SerializeMethodName),
ArgumentList(SeparatedList(new[] { Argument(writerParam), Argument(sessionParam), Argument(instanceParam) })))));
body.Add(ExpressionStatement(InvocationExpression(writerParam.Member("WriteEndBase"), ArgumentList())));
}
// Order members according to their FieldId, since fields must be serialized in order and FieldIds are serialized as deltas.
uint previousFieldId = 0;
foreach (var member in typeDescription.Members.OrderBy(m => m.FieldId))
{
var fieldIdDelta = member.FieldId - previousFieldId;
previousFieldId = member.FieldId;
var codec = fieldDescriptions.OfType <CodecFieldDescription>().First(f => f.UnderlyingType.Equals(GetExpectedType(member.Type)));
var expectedType = fieldDescriptions.OfType <TypeFieldDescription>().First(f => f.UnderlyingType.Equals(GetExpectedType(member.Type)));
body.Add(
ExpressionStatement(
InvocationExpression(
ThisExpression().Member(codec.FieldName).Member("WriteField"),
ArgumentList(
SeparatedList(
new[]
{
Argument(writerParam),
Argument(sessionParam),
Argument(LiteralExpression(SyntaxKind.NumericLiteralExpression, Literal(fieldIdDelta))),
Argument(expectedType.FieldName.ToIdentifierName()),
Argument(instanceParam.Member(member.Member.Name))
})))));
}
return(MethodDeclaration(returnType, SerializeMethodName)
.AddModifiers(Token(SyntaxKind.PublicKeyword))
.AddParameterListParameters(
Parameter("writer".ToIdentifier()).WithType(libraryTypes.Writer.ToTypeSyntax()),
Parameter("session".ToIdentifier()).WithType(libraryTypes.SerializerSession.ToTypeSyntax()),
Parameter("instance".ToIdentifier()).WithType(typeDescription.Type.ToTypeSyntax()))
.AddBodyStatements(body.ToArray()));
}
public CodeGenerator(Compilation compilation, CodeGeneratorOptions options)
{
this.compilation = compilation;
this.options = options;
this.libraryTypes = LibraryTypes.FromCompilation(compilation, options);
if (options.GenerateSerializerAttributes != null)
{
this.generateSerializerAttributes = options.GenerateSerializerAttributes.Select(compilation.GetTypeByMetadataName).ToArray();
}
}
private static MemberDeclarationSyntax GenerateGetArgumentCount(
LibraryTypes libraryTypes,
MethodDescription methodDescription) =>
PropertyDeclaration(libraryTypes.Int32.ToTypeSyntax(), "ArgumentCount")
.WithExpressionBody(
ArrowExpressionClause(
LiteralExpression(
SyntaxKind.NumericLiteralExpression,
Literal(methodDescription.Method.Parameters.Length))))
.WithModifiers(TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.OverrideKeyword)))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken));
public static (ClassDeclarationSyntax, IGeneratedInvokerDescription) Generate(
Compilation compilation,
LibraryTypes libraryTypes,
IInvokableInterfaceDescription interfaceDescription,
MethodDescription methodDescription)
{
var method = methodDescription.Method;
var generatedClassName = GetSimpleClassName(method);
var fieldDescriptions = GetFieldDescriptions(methodDescription.Method, interfaceDescription);
var fields = GetFieldDeclarations(fieldDescriptions, libraryTypes);
var ctor = GenerateConstructor(generatedClassName, fieldDescriptions);
var targetField = fieldDescriptions.OfType <TargetFieldDescription>().Single();
var resultField = fieldDescriptions.OfType <ResultFieldDescription>().FirstOrDefault();
var classDeclaration = ClassDeclaration(generatedClassName)
.AddBaseListTypes(SimpleBaseType(libraryTypes.Invokable.ToTypeSyntax()))
.AddModifiers(Token(SyntaxKind.InternalKeyword), Token(SyntaxKind.SealedKeyword))
.AddAttributeLists(
AttributeList(SingletonSeparatedList(CodeGenerator.GetGeneratedCodeAttributeSyntax())))
.AddMembers(fields)
.AddMembers(ctor)
.AddMembers(
GenerateGetArgumentCount(libraryTypes, methodDescription),
GenerateSetTargetMethod(libraryTypes, interfaceDescription, targetField),
GenerateGetTargetMethod(libraryTypes, targetField),
GenerateResetMethod(libraryTypes, fieldDescriptions),
GenerateGetArgumentMethod(libraryTypes, methodDescription, fieldDescriptions),
GenerateSetArgumentMethod(libraryTypes, methodDescription, fieldDescriptions),
GenerateInvokeMethod(libraryTypes, methodDescription, fieldDescriptions, targetField, resultField),
GenerateSetResultProperty(libraryTypes, resultField),
GenerateGetResultProperty(libraryTypes, resultField));
var typeParameters = interfaceDescription.InterfaceType.TypeParameters.Select(tp => (tp, tp.Name))
.Concat(method.TypeParameters.Select(tp => (tp, tp.Name)))
.ToList();
if (typeParameters.Count > 0)
{
classDeclaration = AddGenericTypeConstraints(classDeclaration, typeParameters);
}
return(classDeclaration,
new GeneratedInvokerDescription(
interfaceDescription,
methodDescription,
generatedClassName,
fieldDescriptions.OfType <IMemberDescription>().ToList()));
}
public InvokableInterfaceDescription(
LibraryTypes libraryTypes,
SemanticModel semanticModel,
INamedTypeSymbol interfaceType,
IEnumerable <MethodDescription> methods,
INamedTypeSymbol proxyBaseType,
bool isExtension)
{
this.ValidateBaseClass(libraryTypes, proxyBaseType);
this.SemanticModel = semanticModel;
this.InterfaceType = interfaceType;
this.ProxyBaseType = proxyBaseType;
this.IsExtension = isExtension;
this.Methods = methods.ToList();
}
private static MemberDeclarationSyntax GenerateGetTargetMethod(
LibraryTypes libraryTypes,
TargetFieldDescription targetField)
{
var type = IdentifierName("TTarget");
var typeToken = Identifier("TTarget");
var body = CastExpression(type, ThisExpression().Member(targetField.FieldName));
return(MethodDeclaration(type, "GetTarget")
.WithTypeParameterList(TypeParameterList(SingletonSeparatedList(TypeParameter(typeToken))))
.WithParameterList(ParameterList())
.WithExpressionBody(ArrowExpressionClause(body))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken))
.WithModifiers(TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.OverrideKeyword))));
}
private static void ValidateBaseClass(LibraryTypes l, INamedTypeSymbol baseClass)
{
var found = false;
foreach (var member in baseClass.GetMembers("SendRequest"))
{
if (member is not IMethodSymbol method)
{
Throw(member, "not method");
}
if (method.TypeParameters.Length != 0)
{
Throw(member, "type params");
}
if (method.Parameters.Length != 2)
{
Throw(member, "params length");
}
if (!SymbolEqualityComparer.Default.Equals(method.Parameters[0].Type, l.IResponseCompletionSource))
{
Throw(member, "param 0");
}
if (!SymbolEqualityComparer.Default.Equals(method.Parameters[1].Type, l.IInvokable))
{
Throw(member, "param 1");
}
if (!method.ReturnsVoid)
{
Throw(member, "return type");
}
found = true;
}
if (!found)
{
throw new InvalidOperationException(
$"Proxy base class {baseClass} does not contain a definition for void SendRequest(IResponseCompletionSource, IInvokable)");
}
public static ClassDeclarationSyntax GenerateActivator(LibraryTypes libraryTypes, ISerializableTypeDescription type)
{
var simpleClassName = GetSimpleClassName(type);
var baseInterface = libraryTypes.IActivator_1.ToTypeSyntax(type.TypeSyntax);
var classDeclaration = ClassDeclaration(simpleClassName)
.AddBaseListTypes(SimpleBaseType(baseInterface))
.AddModifiers(Token(SyntaxKind.InternalKeyword), Token(SyntaxKind.SealedKeyword))
.AddAttributeLists(AttributeList(SingletonSeparatedList(CodeGenerator.GetGeneratedCodeAttributeSyntax())))
.AddMembers(GenerateCreateMethod(libraryTypes, type));
if (type.IsGenericType)
{
classDeclaration = AddGenericTypeConstraints(classDeclaration, type);
}
return(classDeclaration);
}
public static ClassDeclarationSyntax GenerateMetadata(Compilation compilation, List <TypeDescription> serializableTypes)
{
var configParam = "config".ToIdentifierName();
var addMethod = configParam.Member("PartialSerializers").Member("Add");
var body = new List <StatementSyntax>();
body.AddRange(
serializableTypes.Select(
type =>
(StatementSyntax)ExpressionStatement(InvocationExpression(addMethod, ArgumentList(SingletonSeparatedList(Argument(TypeOfExpression(GetPartialSerializerTypeName(type.Type)))))))
));
var libraryTypes = LibraryTypes.FromCompilation(compilation);
var configType = libraryTypes.SerializerConfiguration;
var configureMethod = MethodDeclaration(PredefinedType(Token(SyntaxKind.VoidKeyword)), "Configure")
.AddModifiers(Token(SyntaxKind.PublicKeyword))
.AddParameterListParameters(
Parameter(configParam.Identifier).WithType(configType.ToTypeSyntax()))
.AddBodyStatements(body.ToArray());
var interfaceType = libraryTypes.ConfigurationProvider.Construct(configType);
return(ClassDeclaration(CodeGenerator.CodeGeneratorName + "_Metadata_" + compilation.AssemblyName.Replace('.', '_'))
.AddBaseListTypes(SimpleBaseType(interfaceType.ToTypeSyntax()))
.AddModifiers(Token(SyntaxKind.InternalKeyword), Token(SyntaxKind.SealedKeyword))
.AddAttributeLists(AttributeList(SingletonSeparatedList(CodeGenerator.GetGeneratedCodeAttributeSyntax())))
.AddMembers(configureMethod));
TypeSyntax GetPartialSerializerTypeName(INamedTypeSymbol type)
{
var genericArity = type.TypeParameters.Length;
var name = PartialSerializerGenerator.GetSimpleClassName(type);
if (genericArity > 0)
{
name += $"<{new string(',', genericArity - 1)}>";
}
return(ParseTypeName(name));
}
}
void ValidateBaseClass(LibraryTypes l, INamedTypeSymbol baseClass)
{
var found = false;
foreach (var member in baseClass.GetMembers("SendRequest"))
{
if (!(member is IMethodSymbol method))
{
Throw(member, "not method");
}
if (method.TypeParameters.Length != 0)
{
Throw(member, "type params");
}
if (method.Parameters.Length != 2)
{
Throw(member, "params length");
}
if (!method.Parameters[0].Type.Equals(l.IResponseCompletionSource))
{
Throw(member, "param 0");
}
if (!method.Parameters[1].Type.Equals(l.IInvokable))
{
Throw(member, "param 1");
}
if (!method.ReturnsVoid)
{
Throw(member, "return type");
}
found = true;
}
if (!found)
{
throw new InvalidOperationException(
$"Proxy base class {baseClass} does not contain a definition for void SendRequest(IResponseCompletionSource, IInvokable)");
}
void Throw(ISymbol m, string x) => throw new InvalidOperationException("Complaint: " + x + " for symbol: " + m.ToDisplayString());
}
private static IEnumerable <MemberDeclarationSyntax> CreateProxyMethods(
LibraryTypes libraryTypes,
IInvokableInterfaceDescription interfaceDescription,
MetadataModel metadataModel)
{
foreach (var methodDescription in interfaceDescription.Methods)
{
yield return(CreateProxyMethod(methodDescription));
}
MethodDeclarationSyntax CreateProxyMethod(MethodDescription methodDescription)
{
var method = methodDescription.Method;
var declaration = MethodDeclaration(method.ReturnType.ToTypeSyntax(), method.Name)
.AddModifiers(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.AsyncKeyword))
.AddParameterListParameters(method.Parameters.Select(GetParameterSyntax).ToArray())
.WithBody(
CreateProxyMethodBody(libraryTypes, metadataModel, interfaceDescription, methodDescription));
var typeParameters = GetTypeParametersWithConstraints(method.TypeParameters);
foreach (var(name, constraints) in typeParameters)
{
if (constraints.Count > 0)
{
declaration = declaration.AddConstraintClauses(
TypeParameterConstraintClause(name).AddConstraints(constraints.ToArray()));
}
}
if (typeParameters.Count > 0)
{
declaration = declaration.WithTypeParameterList(
TypeParameterList(SeparatedList(typeParameters.Select(tp => TypeParameter(tp.Item1)))));
}
return(declaration);
}
}
void ValidateBaseClass(LibraryTypes l, INamedTypeSymbol baseClass)
{
var found = false;
foreach (var member in baseClass.GetMembers("Invoke"))
{
if (!(member is IMethodSymbol method))
{
continue;
}
if (method.TypeParameters.Length != 1)
{
continue;
}
if (method.Parameters.Length != 1)
{
continue;
}
if (!method.Parameters[0].Type.Equals(method.TypeParameters[0]))
{
continue;
}
if (!method.TypeParameters[0].ConstraintTypes.Contains(l.IInvokable))
{
continue;
}
if (!method.ReturnType.Equals(l.ValueTask))
{
continue;
}
found = true;
}
if (!found)
{
throw new InvalidOperationException(
$"Proxy base class {baseClass} does not contain a definition for ValueTask Invoke<T>(T) where T : IInvokable");
}
}
private static MemberDeclarationSyntax GenerateResetMethod(
LibraryTypes libraryTypes,
List <FieldDescription> fields)
{
var body = new List <StatementSyntax>();
foreach (var field in fields)
{
if (!field.IsInjected)
{
body.Add(
ExpressionStatement(
AssignmentExpression(
SyntaxKind.SimpleAssignmentExpression,
ThisExpression().Member(field.FieldName),
DefaultExpression(field.FieldType.ToTypeSyntax()))));
}
}
return(MethodDeclaration(libraryTypes.Void.ToTypeSyntax(), "Reset")
.WithModifiers(TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.OverrideKeyword)))
.WithBody(Block(body)));
}
private static MemberDeclarationSyntax GenerateInvokeInnerMethod(
LibraryTypes libraryTypes,
MethodDescription method,
List <FieldDescription> fields,
TargetFieldDescription target)
{
var resultTask = IdentifierName("resultTask");
// C# var resultTask = this.target.{Method}({params});
var args = SeparatedList(
fields.OfType <MethodParameterFieldDescription>()
.OrderBy(p => p.ParameterOrdinal)
.Select(p => Argument(ThisExpression().Member(p.FieldName))));
ExpressionSyntax methodCall;
if (method.Method.TypeParameters.Length > 0)
{
methodCall = MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
ThisExpression().Member(target.FieldName),
GenericName(
Identifier(method.Method.Name),
TypeArgumentList(
SeparatedList <TypeSyntax>(
method.Method.TypeParameters.Select(p => IdentifierName(p.Name))))));
}
else
{
methodCall = ThisExpression().Member(target.FieldName).Member(method.Method.Name);
}
return(MethodDeclaration(method.Method.ReturnType.ToTypeSyntax(), "InvokeInner")
.WithParameterList(ParameterList())
.WithExpressionBody(ArrowExpressionClause(InvocationExpression(methodCall, ArgumentList(args))))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken))
.WithModifiers(TokenList(Token(SyntaxKind.ProtectedKeyword), Token(SyntaxKind.OverrideKeyword))));
}
public ExpressionSyntax GetObjectCreationExpression(LibraryTypes libraryTypes) => InvocationExpression(ObjectCreationExpression(this.TypeSyntax));
private static MemberDeclarationSyntax GenerateDeserializeMethod(TypeDescription typeDescription,
List <SerializerFieldDescription> fieldDescriptions,
LibraryTypes libraryTypes)
{
var returnType = PredefinedType(Token(SyntaxKind.VoidKeyword));
var readerParam = "reader".ToIdentifierName();
var sessionParam = "session".ToIdentifierName();
var instanceParam = "instance".ToIdentifierName();
var fieldIdVar = "fieldId".ToIdentifierName();
var headerVar = "header".ToIdentifierName();
var body = new List <StatementSyntax>
{
// C#: uint fieldId = 0;
LocalDeclarationStatement(
VariableDeclaration(
PredefinedType(Token(SyntaxKind.UIntKeyword)),
SingletonSeparatedList(VariableDeclarator(fieldIdVar.Identifier)
.WithInitializer(EqualsValueClause(LiteralExpression(SyntaxKind.NumericLiteralExpression, Literal(0)))))))
};
if (HasComplexBaseType(typeDescription.Type))
{
// C#: this.baseTypeSerializer.Deserialize(ref reader, session, instance);
body.Add(
ExpressionStatement(
InvocationExpression(
ThisExpression().Member(BaseTypeSerializerFieldName.ToIdentifierName()).Member(DeserializeMethodName),
ArgumentList(SeparatedList(new[]
{
Argument(readerParam).WithRefOrOutKeyword(Token(SyntaxKind.RefKeyword)),
Argument(sessionParam),
Argument(instanceParam)
})))));
}
body.Add(WhileStatement(LiteralExpression(SyntaxKind.TrueLiteralExpression), Block(GetDeserializerLoopBody())));
var parameters = new[]
{
Parameter(readerParam.Identifier).WithType(libraryTypes.Reader.ToTypeSyntax()).WithModifiers(TokenList(Token(SyntaxKind.RefKeyword))),
Parameter(sessionParam.Identifier).WithType(libraryTypes.SerializerSession.ToTypeSyntax()),
Parameter(instanceParam.Identifier).WithType(typeDescription.Type.ToTypeSyntax())
};
if (typeDescription.Type.IsValueType)
{
parameters[2] = parameters[2].WithModifiers(TokenList(Token(SyntaxKind.RefKeyword)));
}
return(MethodDeclaration(returnType, DeserializeMethodName)
.AddModifiers(Token(SyntaxKind.PublicKeyword))
.AddParameterListParameters(parameters)
.AddBodyStatements(body.ToArray()));
// Create the loop body.
List <StatementSyntax> GetDeserializerLoopBody()
{
return(new List <StatementSyntax>
{
// C#: var header = reader.ReadFieldHeader(session);
LocalDeclarationStatement(
VariableDeclaration(
IdentifierName("var"),
SingletonSeparatedList(
VariableDeclarator(headerVar.Identifier)
.WithInitializer(EqualsValueClause(InvocationExpression(readerParam.Member("ReadFieldHeader"),
ArgumentList(SingletonSeparatedList(Argument(sessionParam))))))))),
// C#: if (header.IsEndBaseOrEndObject) break;
IfStatement(MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, headerVar, IdentifierName("IsEndBaseOrEndObject")), BreakStatement()),
// C#: fieldId += header.FieldIdDelta;
ExpressionStatement(
AssignmentExpression(
SyntaxKind.AddAssignmentExpression,
fieldIdVar,
Token(SyntaxKind.PlusEqualsToken),
MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, headerVar, IdentifierName("FieldIdDelta")))),
// C#: switch (fieldId) { ... }
SwitchStatement(fieldIdVar, List(GetSwitchSections()))
});
}
// Creates switch sections for each member.
List <SwitchSectionSyntax> GetSwitchSections()
{
var switchSections = new List <SwitchSectionSyntax>();
foreach (var member in typeDescription.Members)
{
// C#: case <fieldId>:
var label = CaseSwitchLabel(LiteralExpression(SyntaxKind.NumericLiteralExpression, Literal(member.FieldId)));
// C#: instance.<member> = this.<codec>.ReadValue(ref reader, session, header);
var codec = fieldDescriptions.OfType <ICodecDescription>()
.Concat(libraryTypes.StaticCodecs)
.First(f => f.UnderlyingType.Equals(GetExpectedType(member.Type)));
// Codecs can either be static classes or injected into the constructor.
// Either way, the member signatures are the same.
var memberType = GetExpectedType(member.Type);
var staticCodec = libraryTypes.StaticCodecs.FirstOrDefault(c => c.UnderlyingType.Equals(memberType));
ExpressionSyntax codecExpression;
if (staticCodec != null)
{
codecExpression = staticCodec.CodecType.ToNameSyntax();
}
else
{
var instanceCodec = fieldDescriptions.OfType <CodecFieldDescription>().First(f => f.UnderlyingType.Equals(memberType));
codecExpression = ThisExpression().Member(instanceCodec.FieldName);
}
ExpressionSyntax readValueExpression = InvocationExpression(
codecExpression.Member("ReadValue"),
ArgumentList(SeparatedList(new[] { Argument(readerParam).WithRefOrOutKeyword(Token(SyntaxKind.RefKeyword)), Argument(sessionParam), Argument(headerVar) })));
if (!codec.UnderlyingType.Equals(member.Type))
{
// If the member type type differs from the codec type (eg because the member is an array), cast the result.
readValueExpression = CastExpression(member.Type.ToTypeSyntax(), readValueExpression);
}
var memberAssignment =
ExpressionStatement(AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, instanceParam.Member(member.Member.Name), readValueExpression));
var caseBody = List(new StatementSyntax[] { memberAssignment, BreakStatement() });
// Create the switch section with a break at the end.
// C#: break;
switchSections.Add(SwitchSection(SingletonList <SwitchLabelSyntax>(label), caseBody));
}
// Add the default switch section.
var consumeUnknown = ExpressionStatement(InvocationExpression(readerParam.Member("ConsumeUnknownField"),
ArgumentList(SeparatedList(new[] { Argument(sessionParam), Argument(headerVar) }))));
switchSections.Add(SwitchSection(SingletonList <SwitchLabelSyntax>(DefaultSwitchLabel()), List(new StatementSyntax[] { consumeUnknown, BreakStatement() })));
return(switchSections);
}
}
private static MemberDeclarationSyntax GenerateSerializeMethod(
TypeDescription typeDescription,
List <SerializerFieldDescription> fieldDescriptions,
LibraryTypes libraryTypes)
{
var returnType = PredefinedType(Token(SyntaxKind.VoidKeyword));
var writerParam = "writer".ToIdentifierName();
var sessionParam = "session".ToIdentifierName();
var instanceParam = "instance".ToIdentifierName();
var body = new List <StatementSyntax>();
if (HasComplexBaseType(typeDescription.Type))
{
body.Add(
ExpressionStatement(
InvocationExpression(
ThisExpression().Member(BaseTypeSerializerFieldName.ToIdentifierName()).Member(SerializeMethodName),
ArgumentList(SeparatedList(new[] { Argument(writerParam).WithRefOrOutKeyword(Token(SyntaxKind.RefKeyword)), Argument(sessionParam), Argument(instanceParam) })))));
body.Add(ExpressionStatement(InvocationExpression(writerParam.Member("WriteEndBase"), ArgumentList())));
}
// Order members according to their FieldId, since fields must be serialized in order and FieldIds are serialized as deltas.
uint previousFieldId = 0;
foreach (var member in typeDescription.Members.OrderBy(m => m.FieldId))
{
var fieldIdDelta = member.FieldId - previousFieldId;
previousFieldId = member.FieldId;
// Codecs can either be static classes or injected into the constructor.
// Either way, the member signatures are the same.
var memberType = GetExpectedType(member.Type);
var staticCodec = libraryTypes.StaticCodecs.FirstOrDefault(c => c.UnderlyingType.Equals(memberType));
ExpressionSyntax codecExpression;
if (staticCodec != null)
{
codecExpression = staticCodec.CodecType.ToNameSyntax();
}
else
{
var instanceCodec = fieldDescriptions.OfType <CodecFieldDescription>().First(f => f.UnderlyingType.Equals(memberType));
codecExpression = ThisExpression().Member(instanceCodec.FieldName);
}
var expectedType = fieldDescriptions.OfType <TypeFieldDescription>().First(f => f.UnderlyingType.Equals(memberType));
body.Add(
ExpressionStatement(
InvocationExpression(
codecExpression.Member("WriteField"),
ArgumentList(
SeparatedList(
new[]
{
Argument(writerParam).WithRefOrOutKeyword(Token(SyntaxKind.RefKeyword)),
Argument(sessionParam),
Argument(LiteralExpression(SyntaxKind.NumericLiteralExpression, Literal(fieldIdDelta))),
Argument(expectedType.FieldName.ToIdentifierName()),
Argument(instanceParam.Member(member.Member.Name))
})))));
}
var parameters = new[]
{
Parameter("writer".ToIdentifier()).WithType(libraryTypes.Writer.ToTypeSyntax()).WithModifiers(TokenList(Token(SyntaxKind.RefKeyword))),
Parameter("session".ToIdentifier()).WithType(libraryTypes.SerializerSession.ToTypeSyntax()),
Parameter("instance".ToIdentifier()).WithType(typeDescription.Type.ToTypeSyntax())
};
if (typeDescription.Type.IsValueType)
{
parameters[2] = parameters[2].WithModifiers(TokenList(Token(SyntaxKind.RefKeyword)));
}
return(MethodDeclaration(returnType, SerializeMethodName)
.AddModifiers(Token(SyntaxKind.PublicKeyword))
.AddParameterListParameters(parameters)
.AddBodyStatements(body.ToArray()));
}
private static List <SerializerFieldDescription> GetFieldDescriptions(TypeDescription typeDescription, LibraryTypes libraryTypes)
{
var type = typeDescription.Type;
var fields = new List <SerializerFieldDescription>();
fields.AddRange(typeDescription.Members.Select(m => GetExpectedType(m.Type)).Distinct().Select(GetTypeDescription));
if (HasComplexBaseType(type))
{
fields.Add(new InjectedFieldDescription(libraryTypes.PartialSerializer.Construct(type.BaseType), BaseTypeSerializerFieldName));
}
// Add a codec field for any field in the target which does not have a static codec.
fields.AddRange(typeDescription.Members
.Select(m => GetExpectedType(m.Type)).Distinct()
.Where(t => !libraryTypes.StaticCodecs.Any(c => c.UnderlyingType.Equals(t)))
.Select(GetCodecDescription));
return(fields);
CodecFieldDescription GetCodecDescription(ITypeSymbol t)
{
var codecType = libraryTypes.FieldCodec.Construct(t);
var fieldName = '_' + ToLowerCamelCase(t.GetValidIdentifier()) + "Codec";
return(new CodecFieldDescription(codecType, fieldName, t));
}
TypeFieldDescription GetTypeDescription(ITypeSymbol t)
{
var fieldName = ToLowerCamelCase(t.GetValidIdentifier()) + "Type";
return(new TypeFieldDescription(libraryTypes.Type, fieldName, t));
}
string ToLowerCamelCase(string input) => char.IsLower(input, 0) ? input : char.ToLowerInvariant(input[0]) + input.Substring(1);
}
private static MemberDeclarationSyntax GenerateInvokeMethod(
LibraryTypes libraryTypes,
MethodDescription method,
List <FieldDescription> fields,
TargetFieldDescription target,
ResultFieldDescription result)
{
var body = new List <StatementSyntax>();
var resultTask = IdentifierName("resultTask");
// C# var resultTask = this.target.{Method}({params});
var args = SeparatedList(
fields.OfType <MethodParameterFieldDescription>()
.OrderBy(p => p.ParameterOrdinal)
.Select(p => Argument(ThisExpression().Member(p.FieldName))));
ExpressionSyntax methodCall;
if (method.Method.TypeParameters.Length > 0)
{
methodCall = MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
ThisExpression().Member(target.FieldName),
GenericName(
Identifier(method.Method.Name),
TypeArgumentList(
SeparatedList <TypeSyntax>(
method.Method.TypeParameters.Select(p => IdentifierName(p.Name))))));
}
else
{
methodCall = ThisExpression().Member(target.FieldName).Member(method.Method.Name);
}
body.Add(
LocalDeclarationStatement(
VariableDeclaration(
ParseTypeName("var"),
SingletonSeparatedList(
VariableDeclarator(resultTask.Identifier)
.WithInitializer(
EqualsValueClause(
InvocationExpression(
methodCall,
ArgumentList(args))))))));
// C#: if (resultTask.IsCompleted) // Even if it failed.
// C#: {
// C#: this.result = resultTask.GetAwaiter().GetResult();
// C#: return default; // default(ValueTask) is a successfully completed ValueTask.
// C#: }
var synchronousCompletionBody = new List <StatementSyntax>();
if (result != null)
{
synchronousCompletionBody.Add(
ExpressionStatement(
AssignmentExpression(
SyntaxKind.SimpleAssignmentExpression,
ThisExpression().Member(result.FieldName),
InvocationExpression(
InvocationExpression(resultTask.Member("GetAwaiter")).Member("GetResult")))));
}
synchronousCompletionBody.Add(ReturnStatement(DefaultExpression(libraryTypes.ValueTask.ToTypeSyntax())));
body.Add(IfStatement(resultTask.Member("IsCompleted"), Block(synchronousCompletionBody)));
// C#: async ValueTask InvokeAsync(ValueTask<int> asyncValue)
// C#: {
// C#: this.result = await asyncValue.ConfigureAwait(false);
// C#: }
var invokeAsyncParam = IdentifierName("asyncTask");
var invokeAsyncBody = new List <StatementSyntax>();
var awaitExpression = AwaitExpression(
InvocationExpression(
invokeAsyncParam.Member("ConfigureAwait"),
ArgumentList(
SingletonSeparatedList(Argument(LiteralExpression(SyntaxKind.FalseLiteralExpression))))));
if (result != null)
{
invokeAsyncBody.Add(
ExpressionStatement(
AssignmentExpression(
SyntaxKind.SimpleAssignmentExpression,
ThisExpression().Member(result.FieldName),
awaitExpression)));
}
else
{
invokeAsyncBody.Add(ExpressionStatement(AwaitExpression(invokeAsyncParam)));
}
var invokeAsync = LocalFunctionStatement(libraryTypes.ValueTask.ToTypeSyntax(), "InvokeAsync")
.WithModifiers(TokenList(Token(SyntaxKind.AsyncKeyword)))
.WithParameterList(
ParameterList(
SingletonSeparatedList(
Parameter(invokeAsyncParam.Identifier).WithType(method.Method.ReturnType.ToTypeSyntax()))))
.WithBody(Block(invokeAsyncBody));
// C#: return InvokeAsync(resultTask);
body.Add(
ReturnStatement(
InvocationExpression(
IdentifierName("InvokeAsync"),
ArgumentList(SingletonSeparatedList(Argument(resultTask))))));
body.Add(invokeAsync);
return(MethodDeclaration(libraryTypes.ValueTask.ToTypeSyntax(), "Invoke")
.WithParameterList(ParameterList())
.WithBody(Block(body))
.WithModifiers(TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.OverrideKeyword))));
}