private void CompileCapturedMethod(DynamicTypeGenerator gen, SqlExpression expression, Type elementType)
{
TypeBuilder tb = ObjectReaderCompiler.CaptureModule.DefineType("reader_type_" + ObjectReaderCompiler.GetNextId());
MethodBuilder mb = tb.DefineMethod(
"Read_" + elementType.Name,
MethodAttributes.Static | MethodAttributes.Public,
CallingConventions.Standard,
elementType,
new Type[] { typeof(ObjectMaterializer<>).MakeGenericType(this.dataReaderType) }
);
gen.GenerateBody(mb.GetILGenerator(), (SqlExpression)SqlDuplicator.Copy(expression));
tb.CreateType();
}
private DynamicMethod CompileDynamicMethod(DynamicTypeGenerator gen, SqlExpression expression, Type elementType)
{
Type objectReaderType = typeof(ObjectMaterializer<>).MakeGenericType(this.dataReaderType);
DynamicMethod dm = new DynamicMethod(
"Read_" + elementType.Name,
elementType,
new Type[] { objectReaderType },
true
);
gen.GenerateBody(dm.GetILGenerator(), expression);
return dm;
}
public IObjectReaderFactory Compile(SqlExpression expression, Type elementType)
{
object mapping = this.services.Context.Mapping.Identity;
DataLoadOptions options = this.services.Context.LoadOptions;
IObjectReaderFactory factory = null;
ObjectReaderFactoryCache cache = null;
bool canBeCompared = SqlProjectionComparer.CanBeCompared(expression);
if(canBeCompared)
{
cache = (ObjectReaderFactoryCache)Thread.GetData(cacheSlot);
if(cache == null)
{
cache = new ObjectReaderFactoryCache(maxReaderCacheSize);
Thread.SetData(cacheSlot, cache);
}
factory = cache.GetFactory(elementType, this.dataReaderType, mapping, options, expression);
}
if(factory == null)
{
DynamicTypeGenerator gen = new DynamicTypeGenerator(this, elementType);
#if DEBUG
if(ObjectReaderCompiler.CaptureModule != null)
{
this.CompileCapturedMethod(gen, expression, elementType);
}
#endif
DynamicMethod dm = this.CompileDynamicMethod(gen, expression, elementType);
Type fnMatType = typeof(Func<,>).MakeGenericType(typeof(ObjectMaterializer<>).MakeGenericType(this.dataReaderType), elementType);
var fnMaterialize = (Delegate)dm.CreateDelegate(fnMatType);
Type factoryType = typeof(ObjectReaderFactory<,>).MakeGenericType(this.dataReaderType, elementType);
factory = (IObjectReaderFactory)Activator.CreateInstance(
factoryType, BindingFlags.Instance | BindingFlags.NonPublic, null,
new object[] { fnMaterialize, gen.NamedColumns, gen.Globals, gen.Locals }, null
);
if(canBeCompared)
{
expression = new SourceExpressionRemover().VisitExpression(expression);
cache.AddFactory(elementType, this.dataReaderType, mapping, options, expression, factory);
}
}
return factory;
}