public IEnumerable<ConstructorCallWeave> FindConstructorCallWeaves(IAssembly assembly, FactoryMap factories)
{
List<ConstructorCallWeave> spots = new List<ConstructorCallWeave>();
foreach (TypeDefinition type in GetTypes(assembly, factories))
{
foreach (MethodDefinition method in type.Methods)
{
if (method.Body == null)
{
continue;
}
foreach (Instruction instruction in method.Body.Instructions)
{
if (instruction.OpCode == OpCodes.Newobj)
{
MethodDefinition constructor = instruction.Operand as MethodDefinition;
if (constructor != null && constructor.Parameters.Count == 0)
{
if (factories.HasForObjectType(constructor.DeclaringType))
{
spots.Add(new ConstructorCallWeave(assembly, method, instruction, constructor));
}
}
}
}
}
}
return spots;
}
public void StoreFactoryMap(IAssembly assembly, FactoryMap factoryMap)
{
MethodInfo getTypeFromHandleReflect = typeof (Type).GetMethod("GetTypeFromHandle", new Type[] { typeof(RuntimeTypeHandle) });
MethodReference getTypeFromHandle = assembly.Import(getTypeFromHandleReflect);
TypeReference systemType = assembly.Import(typeof(Type));
TypeReference arrayOfTypes = assembly.Import(typeof(Type[]));
TypeReference arrayOfArrayOfTypes = assembly.Import(typeof(Type[][]));
// Now we create the actual type and stuff...
TypeDefinition mapType = GetFactoryMapType(assembly);
MethodDefinition getFactoriesMethod = new MethodDefinition(FactoryMapMethodName, MethodAttributes.Public, arrayOfArrayOfTypes);
getFactoriesMethod.IsVirtual = true;
mapType.Methods.Add(getFactoriesMethod);
getFactoriesMethod.Body.Variables.Add(new VariableDefinition("map", 0, getFactoriesMethod, arrayOfArrayOfTypes));
getFactoriesMethod.Body.Variables.Add(new VariableDefinition("row", 1, getFactoriesMethod, arrayOfTypes));
getFactoriesMethod.Body.InitLocals = true;
CilWorker worker = getFactoriesMethod.Body.CilWorker;
List<Factory> factories = new List<Factory>(factoryMap.Factories);
worker.Append(worker.Create(OpCodes.Nop));
worker.Append(worker.Create(OpCodes.Ldc_I4, factories.Count));
worker.Append(worker.Create(OpCodes.Newarr, arrayOfTypes));
worker.Append(worker.Create(OpCodes.Stloc_0));
worker.Append(worker.Create(OpCodes.Ldloc_0));
int index = 0;
foreach (Factory factory in factories)
{
worker.Append(worker.Create(OpCodes.Ldc_I4, index));
worker.Append(worker.Create(OpCodes.Ldc_I4, 2));
worker.Append(worker.Create(OpCodes.Newarr, systemType));
worker.Append(worker.Create(OpCodes.Stloc_1));
worker.Append(worker.Create(OpCodes.Ldloc_1));
worker.Append(worker.Create(OpCodes.Ldc_I4_0));
worker.Append(worker.Create(OpCodes.Ldtoken, factory.ObjectType));
worker.Append(worker.Create(OpCodes.Call, getTypeFromHandle));
worker.Append(worker.Create(OpCodes.Stelem_Ref));
worker.Append(worker.Create(OpCodes.Ldloc_1));
worker.Append(worker.Create(OpCodes.Ldc_I4_1));
worker.Append(worker.Create(OpCodes.Ldtoken, factory.FactoryType));
worker.Append(worker.Create(OpCodes.Call, getTypeFromHandle));
worker.Append(worker.Create(OpCodes.Stelem_Ref));
worker.Append(worker.Create(OpCodes.Ldloc_1));
worker.Append(worker.Create(OpCodes.Stelem_Ref));
index++;
worker.Append(worker.Create(OpCodes.Ldloc_0));
}
worker.Append(worker.Create(OpCodes.Ret));
assembly.Inject(mapType);
}
private static IEnumerable<TypeDefinition> GetTypes(IAssembly assembly, FactoryMap factories)
{
foreach (TypeDefinition type in assembly.Types)
{
if (!factories.HasForFactoryType(type))
{
yield return type;
}
}
}
public FactoryMap FindFactories(IAssembly assembly)
{
FactoryMap map = new FactoryMap();
foreach (TypeDefinition type in assembly.Types)
{
TypeReference objectIsFactoryFor = IsFactory(type);
if (objectIsFactoryFor != null)
{
_log.Log("Found {0} as factory for {1}", type.FullName, objectIsFactoryFor.FullName);
map.AddFactory(objectIsFactoryFor, type);
}
}
return map;
}
public void WeaveConstructorCalls(IEnumerable<ConstructorCallWeave> weaves, FactoryMap factories)
{
MethodInfo getFactoryMethod = typeof(Factories).GetMethod("Create");
foreach (ConstructorCallWeave weave in weaves)
{
Factory factory = factories.GetForObjectType(weave.Constructor.DeclaringType);
_log.Log("Weaving {0} in {1}", factory.ObjectType, weave.ParentMethod);
MethodReference getObjectMethodReference = weave.ParentAssembly.Import(getFactoryMethod);
GenericInstanceMethod methodCall = new GenericInstanceMethod(getObjectMethodReference);
methodCall.GenericArguments.Add(factory.ObjectType);
CilWorker worker = weave.ParentMethod.Body.CilWorker;
Instruction callGetFactory = worker.Create(OpCodes.Call, methodCall);
worker.Replace(weave.NewInstruction, callGetFactory);
}
}