/// <summary>
/// Two special cases for the right-hand side of an assignment or argument to a new expression where it turns into a column swing:
/// g = e_i.f
/// Then the projection for g turns into a swing of the column from f
/// E_i must be a decomposable type
/// g = e_i
/// The the projection for g turns into a swing of the pseudo-column for E_i
/// E_i must be an atomic type
/// </summary>
/// <returns>True iff the expression was transformed, either into a computed field or a swinging field.</returns>
private bool HandleSimpleAssignments(Expression e, MyFieldInfo destinationColumn)
{
var simpleAssignedValue = e as MemberExpression;
ParameterExpression parameter = null;
if (simpleAssignedValue != null)
{
parameter = simpleAssignedValue.Expression as ParameterExpression;
}
var paramIsForThisLambda = parameter != null && this.parameterInformation.ContainsKey(parameter);
if (simpleAssignedValue != null && paramIsForThisLambda)
{
if (!this.parameterInformation.TryGetValue(parameter, out SelectParameterInformation spi))
{
// if this particular parameter is not being substituted for, then the caller must not want it turned
// into anything. however, i think it might be an error situation and "this.error" should be set to true.
this.computedFields.Add(destinationColumn, simpleAssignedValue);
return(true);
}
var columnarField = spi.parameterRepresentation.Fields[simpleAssignedValue.Member.Name];
if (this.noSwingingFields)
{
var a = GetBatchColumnIndexer(parameter, columnarField);
this.computedFields.Add(destinationColumn, a);
}
else
{
this.swingingFields.Add(Tuple.Create(destinationColumn, columnarField));
}
return(true);
}
parameter = e as ParameterExpression;
if (parameter != null && this.parameterInformation.ContainsKey(parameter))
{
if (this.parameterInformation.TryGetValue(parameter, out SelectParameterInformation spi))
{
var cr = spi.parameterRepresentation;
if (!cr.noFields)
{
this.error = true;
return(false);
}
if (this.noSwingingFields)
{
var a = GetBatchColumnIndexer(parameter, cr.PseudoField);
this.computedFields.Add(destinationColumn, a);
}
else
{
this.swingingFields.Add(Tuple.Create(destinationColumn, cr.PseudoField));
}
return(true);
}
}
return(false);
}
protected static string ColumnPointerFieldAssignment(MyFieldInfo f, string batchName)
{
if (f.OptimizeString())
{
return(string.Format("this.{1}_{0}_col = {1}.{0};", f.Name, batchName));
}
else
{
return(string.Format("this.{1}_{0}_col = {1}.{0}.col;", f.Name, batchName));
}
}
protected static string ColumnPointerFieldDeclaration(MyFieldInfo f, string batchName)
{
if (f.OptimizeString())
{
return(string.Format("Microsoft.StreamProcessing.Internal.Collections.Multistring {1}_{0}_col;", f.Name, batchName));
}
else
{
return(string.Format("{2} {1}_{0}_col;", f.Name, batchName, f.Type.MakeArrayType().GetCSharpSourceSyntax()));
}
}
protected static string EndColumnPointerDeclaration(MyFieldInfo f)
{
if (f.canBeFixed)
{
return("}");
}
else
{
return(string.Empty);
}
}
public ColumnarRepresentation(Type t)
{
this.RepresentationFor = t;
var d = new Dictionary <string, MyFieldInfo>();
this.Fields = d;
foreach (var f in t.GetTypeInfo().GetFields(BindingFlags.Instance | BindingFlags.Public))
{
d.Add(f.Name, new MyFieldInfo(f /*, prefix*/));
}
// Any autoprops should be treated just as if they were a field
foreach (var p in t.GetTypeInfo().GetProperties(BindingFlags.Instance | BindingFlags.Public))
{
var getMethod = p.GetMethod;
if (getMethod == null)
{
continue;
}
if (!getMethod.IsDefined(typeof(System.Runtime.CompilerServices.CompilerGeneratedAttribute)))
{
continue;
}
var setMethod = p.SetMethod;
if (setMethod == null)
{
continue;
}
if (!setMethod.IsDefined(typeof(System.Runtime.CompilerServices.CompilerGeneratedAttribute)))
{
continue;
}
d.Add(p.Name, new MyFieldInfo(p /*, prefix*/));
}
if (!this.Fields.Any())
{
if (t.HasSupportedParameterizedConstructor())
{
foreach (var p in t.GetTypeInfo().GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
d.Add(p.Name, new MyFieldInfo(p /*, prefix*/));
}
}
else
{
this.noFields = true;
this.PseudoField = new MyFieldInfo(t, "payload");
}
}
}
protected static string BeginColumnPointerDeclaration(MyFieldInfo f, string batchName)
{
if (f.canBeFixed)
{
return(string.Format("fixed ({0}* {2}_{1}_col = {2}.{1}.col) {{", f.TypeName, f.Name, batchName));
}
else if (f.OptimizeString())
{
return(string.Format("var {1}_{0}_col = {1}.{0};", f.Name, batchName));
}
else
{
return(string.Format("var {1}_{0}_col = {1}.{0}.col;", f.Name, batchName));
}
}
private IndexExpression GetBatchColumnIndexer(ParameterExpression parameter, MyFieldInfo f)
{
Contract.Requires(this.parameterInformation.ContainsKey(parameter));
var parameterInfo = this.parameterInformation[parameter];
var batch = Expression.Variable(parameterInfo.BatchType, parameterInfo.BatchName);
var column = Expression.Field(batch, f.Name);
var indexVariable = Expression.Variable(typeof(int), parameterInfo.IndexVariableName);
if (column.Type.Equals(typeof(Internal.Collections.MultiString)))
{
var indexer = typeof(Internal.Collections.MultiString).GetTypeInfo().GetProperty("Item");
return(Expression.MakeIndex(column, indexer, new List <Expression>()
{
indexVariable
}));
}
else
{
var colArray = Expression.Field(column, "col");
return(Expression.ArrayAccess(colArray, indexVariable));
}
}
public static Tuple <Type, string> Generate <TOuterKey, TSource, TInnerKey>(
Expression <Func <TInnerKey, int> > hashComparer,
Expression <Func <TSource, TInnerKey> > keySelector,
bool nested)
{
var typeOfTOuterKey = typeof(TOuterKey);
var typeOfTSource = typeof(TSource);
var typeOfTInnerKey = typeof(TInnerKey);
string expandedCode;
List <Assembly> assemblyReferences;
string errorMessages = null;
try
{
string generatedClassName = $"GeneratedGroupStreamable_{GroupStreamableSequenceNumber++}";
string transformedKeySelectorAsString;
MyFieldInfo swingingField = default;
if (typeOfTInnerKey.IsAnonymousTypeName())
{
Contract.Assume(keySelector.Body is NewExpression);
var transformedFunction = Extensions.TransformUnaryFunction <TOuterKey, TSource>(keySelector);
var newBody = (NewExpression)transformedFunction.Body;
transformedKeySelectorAsString = string.Join(",", newBody.Arguments.Select(arg => arg.ExpressionToCSharp()));
}
else
{
var body = keySelector.Body;
if (!nested && body is MemberExpression singleFieldProjection)
{
if (singleFieldProjection.Expression is ParameterExpression dereferencedObject)
{
// then can just swing a pointer to set the key of the result message
Contract.Assume(dereferencedObject == keySelector.Parameters.ElementAt(0));
var f = singleFieldProjection.Member;
var sourceMessageRepresentation = new ColumnarRepresentation(typeOfTSource);
var fieldToSwingFrom = sourceMessageRepresentation.Fields[f.Name];
swingingField = fieldToSwingFrom;
transformedKeySelectorAsString = swingingField.Name + "_col[i]";
}
else
{
var transformedPredicate = Extensions.TransformUnaryFunction <TOuterKey, TSource>(keySelector).Body;
if (transformedPredicate == null)
{
return(Tuple.Create((Type)null, errorMessages));
}
transformedKeySelectorAsString = transformedPredicate.ExpressionToCSharp();
}
}
else
{
var transformedPredicate = Extensions.TransformUnaryFunction <TOuterKey, TSource>(keySelector).Body;
if (transformedPredicate == null)
{
return(Tuple.Create((Type)null, errorMessages));
}
transformedKeySelectorAsString = transformedPredicate.ExpressionToCSharp();
}
}
var inlinedHashCodeComputation = hashComparer.Inline("key");
var template = new GroupTemplate(
generatedClassName,
typeOfTOuterKey,
typeOfTSource,
typeOfTInnerKey,
transformedKeySelectorAsString,
inlinedHashCodeComputation,
nested)
{
swingingField = swingingField,
payloadMightBeNull = typeOfTSource.CanContainNull()
};
if (!nested && Config.UseMultiString &&
typeOfTInnerKey.Equals(typeof(string)) &&
keySelector.IsSimpleFieldOrPropertyAccess())
{
var transformedPredicate = Extensions.TransformUnaryFunction <TOuterKey, TSource>(keySelector).Body;
template.transformedKeySelectorAsString = transformedPredicate.ExpressionToCSharp();
template.inlinedHashCodeComputation = "hashCodeVector.col[i]";
var fieldName = ((MemberExpression)keySelector.Body).Member.Name;
template.vectorHashCodeInitialization = $"resultBatch.hash = {Transformer.ColumnFieldPrefix}{fieldName}_col.GetHashCode(batch.bitvector);";
template.swingingHashColumn = true;
}
template.fields = new ColumnarRepresentation(typeOfTSource).AllFields;
expandedCode = template.TransformText();
assemblyReferences = Transformer.AssemblyReferencesNeededFor(typeOfTOuterKey, typeOfTSource, typeOfTInnerKey);
assemblyReferences.Add(typeof(IStreamable <,>).GetTypeInfo().Assembly);
assemblyReferences.Add(Transformer.GeneratedStreamMessageAssembly <TOuterKey, TSource>());
if (nested)
{
assemblyReferences.Add(Transformer.GeneratedStreamMessageAssembly <CompoundGroupKey <TOuterKey, TInnerKey>, TSource>());
assemblyReferences.Add(Transformer.GeneratedMemoryPoolAssembly <CompoundGroupKey <TOuterKey, TInnerKey>, TSource>());
}
else
{
assemblyReferences.Add(Transformer.GeneratedStreamMessageAssembly <TInnerKey, TSource>());
assemblyReferences.Add(Transformer.GeneratedMemoryPoolAssembly <TInnerKey, TSource>());
}
assemblyReferences.AddRange(Transformer.AssemblyReferencesNeededFor(keySelector));
var a = Transformer.CompileSourceCode(expandedCode, assemblyReferences, out errorMessages);
if (typeOfTInnerKey.IsAnonymousTypeName())
{
if (errorMessages == null)
{
errorMessages = string.Empty;
}
errorMessages += "\nCodegen Warning: The inner key type for Group is anonymous, causing the use of Activator.CreateInstance in an inner loop. This will lead to poor performance.\n";
}
generatedClassName = generatedClassName.AddNumberOfNecessaryGenericArguments(typeOfTOuterKey, typeOfTSource, typeOfTInnerKey);
var t = a.GetType(generatedClassName);
t = t.InstantiateAsNecessary(typeOfTOuterKey, typeOfTSource, typeOfTInnerKey);
return(Tuple.Create(t, errorMessages));
}
catch
{
if (Config.CodegenOptions.DontFallBackToRowBasedExecution)
{
throw new InvalidOperationException("Code Generation failed when it wasn't supposed to!");
}
return(Tuple.Create((Type)null, errorMessages));
}
}
public static bool OptimizeString(this MyFieldInfo field) => Config.UseMultiString && field.Type == typeof(string);
public static string AccessExpressionForRowValue(this MyFieldInfo f, string batchVariableName, string indexVariableName)
=> string.Format(CultureInfo.InvariantCulture, "{0}.{1}{2}[{3}]", batchVariableName, f.Name, f.OptimizeString() ? string.Empty : ".col", indexVariableName);
public ColumnarRepresentation(Type t, string pseudoFieldName)
{
this.RepresentationFor = t;
this.noFields = true;
this.PseudoField = new MyFieldInfo(t, pseudoFieldName);
}
protected static string ColumnPointerFieldAssignment(MyFieldInfo f, string batchName)
=> f.OptimizeString()
? string.Format("this.{1}_{0}_col = {1}.{0};", f.Name, batchName)
: string.Format("this.{1}_{0}_col = {1}.{0}.col;", f.Name, batchName);
protected static string EndColumnPointerDeclaration(MyFieldInfo f) => f.canBeFixed ? "}" : string.Empty;
protected static string BeginColumnPointerDeclaration(MyFieldInfo f, string batchName)
=> f.canBeFixed
? string.Format("fixed ({0}* {2}_{1}_col = {2}.{1}.col) {{", f.TypeName, f.Name, batchName)
: f.OptimizeString()
? string.Format("var {1}_{0}_col = {1}.{0};", f.Name, batchName)
: string.Format("var {1}_{0}_col = {1}.{0}.col;", f.Name, batchName);
