/// <summary>
/// Transforms open generic types to closed instantiation using context information.
/// As an example, if <c>B{T}</c> inherits from <c>A{T}</c>, running it with <c>B{C}</c> as context and <c>A{B.T}</c>
/// as type, it will return <c>A{C}</c>.
/// </summary>
public static TypeReference Process(TypeReference context, TypeReference type)
{
if (type is null)
{
return(null);
}
var parentContext = context;
GenericInstanceType genericInstanceTypeContext = null;
while (parentContext != null)
{
genericInstanceTypeContext = parentContext as GenericInstanceType;
if (genericInstanceTypeContext != null)
{
break;
}
parentContext = parentContext.Resolve().BaseType;
}
if (genericInstanceTypeContext is null || genericInstanceTypeContext.ContainsGenericParameter)
{
return(type);
}
// Build dictionary that will map generic type to their real implementation type
var genericTypeMapping = new Dictionary <TypeReference, TypeReference>();
while (parentContext != null)
{
var resolvedType = parentContext.Resolve();
for (int i = 0; i < resolvedType.GenericParameters.Count; ++i)
{
var genericParameter = parentContext.GetElementType().Resolve().GenericParameters[i];
genericTypeMapping.Add(genericParameter, genericInstanceTypeContext.GenericArguments[i]);
}
parentContext = parentContext.Resolve().BaseType;
if (parentContext is GenericInstanceType)
{
genericInstanceTypeContext = parentContext as GenericInstanceType;
}
}
var visitor = new ResolveGenericsVisitor(genericTypeMapping);
var result = visitor.VisitDynamic(type);
// Make sure type is closed now
if (result.ContainsGenericParameter)
{
throw new InvalidOperationException("Unsupported generic resolution.");
}
return(result);
}
public static void InflateGenericType(TypeDefinition genericType, TypeDefinition inflatedType, params TypeReference[] genericTypes)
{
// Base type
var genericMapping = new Dictionary <TypeReference, TypeReference>();
for (int i = 0; i < genericTypes.Length; ++i)
{
genericMapping.Add(genericType.GenericParameters[i], genericTypes[i]);
}
var resolveGenericsVisitor = new ResolveGenericsVisitor(genericMapping);
inflatedType.BaseType = inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(genericType.BaseType));
// Some stuff are not handled yet
if (genericType.HasNestedTypes)
{
throw new NotImplementedException();
}
foreach (var field in genericType.Fields)
{
var clonedField = new FieldDefinition(field.Name, field.Attributes, inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(field.FieldType)));
inflatedType.Fields.Add(clonedField);
}
foreach (var property in genericType.Properties)
{
if (property.HasParameters)
{
throw new NotImplementedException();
}
var clonedProperty = new PropertyDefinition(property.Name, property.Attributes, inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(property.PropertyType)))
{
HasThis = property.HasThis,
GetMethod = property.GetMethod != null?InflateMethod(inflatedType, property.GetMethod, resolveGenericsVisitor) : null,
SetMethod = property.SetMethod != null?InflateMethod(inflatedType, property.GetMethod, resolveGenericsVisitor) : null,
};
inflatedType.Properties.Add(clonedProperty);
}
// Clone methods
foreach (var method in genericType.Methods)
{
var clonedMethod = InflateMethod(inflatedType, method, resolveGenericsVisitor);
inflatedType.Methods.Add(clonedMethod);
}
}
private static MethodDefinition InflateMethod(TypeDefinition inflatedType, MethodDefinition method, ResolveGenericsVisitor resolveGenericsVisitor)
{
var clonedMethod = new MethodDefinition(method.Name, method.Attributes, inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(method.ReturnType)));
clonedMethod.Parameters.AddRange(
method.Parameters.Select(x => new ParameterDefinition(x.Name, x.Attributes, inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(x.ParameterType)))));
if (method.Body != null)
{
clonedMethod.Body.Variables.AddRange(
method.Body.Variables.Select(x => new VariableDefinition(inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(x.VariableType)))));
clonedMethod.Body.InitLocals = method.Body.InitLocals;
var mappedInstructions = new Dictionary <Instruction, Instruction>();
foreach (var instruction in method.Body.Instructions)
{
// Create nop instructions to start with (if we use actual opcode, it would do an operand check)
var mappedInstruction = Instruction.Create(OpCodes.Nop);
mappedInstruction.OpCode = instruction.OpCode;
mappedInstruction.Operand = instruction.Operand;
mappedInstructions[instruction] = mappedInstruction;
}
foreach (var instruction in method.Body.Instructions)
{
// Fix operand
var mappedInstruction = mappedInstructions[instruction];
if (mappedInstruction.Operand is Instruction)
{
mappedInstruction.Operand = mappedInstructions[(Instruction)instruction.Operand];
}
else if (mappedInstruction.Operand is ParameterDefinition)
{
var parameterIndex = method.Parameters.IndexOf((ParameterDefinition)instruction.Operand);
mappedInstruction.Operand = clonedMethod.Parameters[parameterIndex];
}
else if (mappedInstruction.Operand is VariableDefinition)
{
var variableIndex = method.Body.Variables.IndexOf((VariableDefinition)instruction.Operand);
mappedInstruction.Operand = clonedMethod.Body.Variables[variableIndex];
}
else if (mappedInstruction.Operand is TypeReference)
{
var newTypeReference = resolveGenericsVisitor.VisitDynamic((TypeReference)mappedInstruction.Operand);
newTypeReference = inflatedType.Module.ImportReference(newTypeReference);
mappedInstruction.Operand = newTypeReference;
}
else if (mappedInstruction.Operand is FieldReference)
{
var fieldReference = (FieldReference)mappedInstruction.Operand;
var newFieldReference = new FieldReference(fieldReference.Name,
inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(fieldReference.FieldType)),
inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(fieldReference.DeclaringType)));
mappedInstruction.Operand = newFieldReference;
}
else if (mappedInstruction.Operand is MethodReference)
{
var methodReference = (MethodReference)mappedInstruction.Operand;
var genericInstanceMethod = methodReference as GenericInstanceMethod;
if (genericInstanceMethod != null)
{
methodReference = genericInstanceMethod.ElementMethod;
}
methodReference = methodReference.GetElementMethod();
var newMethodReference = new MethodReference(methodReference.Name,
inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(methodReference.ReturnType)),
inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(methodReference.DeclaringType)))
{
HasThis = methodReference.HasThis,
ExplicitThis = methodReference.ExplicitThis,
CallingConvention = methodReference.CallingConvention,
};
foreach (var parameter in methodReference.Parameters)
{
newMethodReference.Parameters.Add(new ParameterDefinition(inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(parameter.ParameterType))));
}
if (methodReference.HasGenericParameters)
{
CopyGenericParameters(methodReference, newMethodReference);
}
if (genericInstanceMethod != null)
{
newMethodReference = newMethodReference.MakeGenericMethod(genericInstanceMethod.GenericArguments.Select(x => inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(x))).ToArray());
}
mappedInstruction.Operand = newMethodReference;
}
else if (mappedInstruction.Operand is Mono.Cecil.CallSite)
{
var callSite = (Mono.Cecil.CallSite)mappedInstruction.Operand;
var newCallSite = new Mono.Cecil.CallSite(inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(callSite.ReturnType)))
{
HasThis = callSite.HasThis,
ExplicitThis = callSite.ExplicitThis,
CallingConvention = callSite.CallingConvention,
};
foreach (var parameter in callSite.Parameters)
{
newCallSite.Parameters.Add(new ParameterDefinition(inflatedType.Module.ImportReference(resolveGenericsVisitor.VisitDynamic(parameter.ParameterType))));
}
mappedInstruction.Operand = newCallSite;
}
else if (mappedInstruction.Operand is Instruction[])
{
// Not used in UpdatableProperty<T>
throw new NotImplementedException();
}
}
clonedMethod.Body.Instructions.AddRange(method.Body.Instructions.Select(x => mappedInstructions[x]));
}
return(clonedMethod);
}