private GeneratedMethod BuildTypeNoCache(ServiceCallSite callSite)
{
// We need to skip visibility checks because services/constructors might be private
var dynamicMethod = new DynamicMethod("ResolveService",
attributes: MethodAttributes.Public | MethodAttributes.Static,
callingConvention: CallingConventions.Standard,
returnType: typeof(object),
parameterTypes: new[] { typeof(ILEmitResolverBuilderRuntimeContext), typeof(ServiceProviderEngineScope) },
owner: GetType(),
skipVisibility: true);
ILEmitCallSiteAnalysisResult info = ILEmitCallSiteAnalyzer.Instance.CollectGenerationInfo(callSite);
ILGenerator ilGenerator = dynamicMethod.GetILGenerator(info.Size);
ILEmitResolverBuilderRuntimeContext runtimeContext = GenerateMethodBody(callSite, ilGenerator);
#if SAVE_ASSEMBLIES
var assemblyName = "Test" + DateTime.Now.Ticks;
var fileName = "Test" + DateTime.Now.Ticks;
var assembly = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName(assemblyName), AssemblyBuilderAccess.RunAndSave);
var module = assembly.DefineDynamicModule(assemblyName, assemblyName + ".dll");
var type = module.DefineType("Resolver");
var method = type.DefineMethod(
"ResolveService", MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, typeof(object),
new[] { typeof(ILEmitResolverBuilderRuntimeContext), typeof(ServiceProviderEngineScope) });
GenerateMethodBody(callSite, method.GetILGenerator(), info);
type.CreateTypeInfo();
assembly.Save(assemblyName + ".dll");
#endif
DependencyInjectionEventSource.Log.DynamicMethodBuilt(callSite.ServiceType, ilGenerator.ILOffset);
return(new GeneratedMethod()
{
Lambda = (Func <ServiceProviderEngineScope, object>)dynamicMethod.CreateDelegate(typeof(Func <ServiceProviderEngineScope, object>), runtimeContext),
Context = runtimeContext,
DynamicMethod = dynamicMethod
});
}
private ILEmitResolverBuilderRuntimeContext GenerateMethodBody(IServiceCallSite callSite, ILGenerator generator, ILEmitCallSiteAnalysisResult info)
{
var context = new ILEmitResolverBuilderContext()
{
Generator = generator,
Constants = null,
Factories = null
};
// try
// {
// Monitor.Enter(scope.ResolvedServices, out var lockTaken);
// return [ create value ]
// }
// finally
// {
// if (lockTaken) Monitor.Exit(scope.ResolvedServices);
// }
var hasScopes = info.HasScope;
if (hasScopes)
{
// Has to be first local defined
var resolvedServicesLocal = context.Generator.DeclareLocal(typeof(IDictionary <object, object>));
Debug.Assert(resolvedServicesLocal.LocalIndex == 0);
var lockTakenLocal = context.Generator.DeclareLocal(typeof(bool));
Debug.Assert(lockTakenLocal.LocalIndex == 1);
context.Generator.BeginExceptionBlock();
// scope
context.Generator.Emit(OpCodes.Ldarg_1);
// .ResolvedServices
context.Generator.Emit(OpCodes.Callvirt, ResolvedServicesGetter);
context.Generator.Emit(OpCodes.Dup);
// Store resolved services
context.Generator.Emit(OpCodes.Stloc_0);
context.Generator.Emit(OpCodes.Ldloca_S, 1);
// Monitor.Enter
context.Generator.Emit(OpCodes.Call, ExpressionResolverBuilder.MonitorEnterMethodInfo);
}
VisitCallSite(callSite, context);
if (hasScopes)
{
var resultLocal = context.Generator.DeclareLocal(typeof(object));
Stloc(context.Generator, resultLocal.LocalIndex);
context.Generator.BeginFinallyBlock();
var postExitLabel = context.Generator.DefineLabel();
context.Generator.Emit(OpCodes.Ldloc_1);
context.Generator.Emit(OpCodes.Brfalse, postExitLabel);
context.Generator.Emit(OpCodes.Ldloc, 0);
// Monitor.Exit
context.Generator.Emit(OpCodes.Call, ExpressionResolverBuilder.MonitorExitMethodInfo);
context.Generator.MarkLabel(postExitLabel);
context.Generator.EndExceptionBlock();
Ldloc(context.Generator, resultLocal.LocalIndex);
}
context.Generator.Emit(OpCodes.Ret);
return(new ILEmitResolverBuilderRuntimeContext
{
Constants = context.Constants?.ToArray(),
Factories = context.Factories?.ToArray(),
Root = _rootScope,
RuntimeResolver = _runtimeResolver,
ScopeFactory = _serviceScopeFactory
});
}