private bool ProcessConstantFromArrayTarget(DynamicMethodGenerationRequest request, ConstantExpression expression)
{
var constantIndex = request.Constants.IndexOf(expression.Value);
if (constantIndex < 0)
{
return(false);
}
var field = request.Target.GetType().GetRuntimeField("Items");
request.ILGenerator.Emit(OpCodes.Ldarg_0);
request.ILGenerator.Emit(OpCodes.Ldfld, field);
request.ILGenerator.EmitInt(constantIndex);
request.ILGenerator.Emit(OpCodes.Ldelem_Ref);
if (expression.Type != typeof(object))
{
request.ILGenerator.Emit(OpCodes.Castclass, expression.Type);
}
return(true);
}
/// <summary>
/// Generate IL for ParameterExpression
/// </summary>
/// <param name="request">request</param>
/// <param name="expression">expression</param>
/// <returns></returns>
public bool GenerateIL(DynamicMethodGenerationRequest request, ParameterExpression expression)
{
var expressionConstants = request.ExpressionRequest.Constants;
if (expression == expressionConstants.ScopeParameter)
{
request.ILGenerator.Emit(OpCodes.Ldarg_1);
return(true);
}
if (expression == expressionConstants.RootDisposalScope)
{
request.ILGenerator.Emit(OpCodes.Ldarg_2);
return(true);
}
if (expression == expressionConstants.InjectionContextParameter)
{
request.ILGenerator.Emit(OpCodes.Ldarg_3);
return(true);
}
return(false);
}
/// <summary>
/// try to create delegate using IL generation
/// </summary>
/// <param name="expressionContext">expression context</param>
/// <param name="finalExpression">final expression to convert</param>
/// <param name="newDelegate">created delegate</param>
/// <returns>true if delegate was created</returns>
public virtual bool TryCreateDelegate(IActivationExpressionResult expressionContext, Expression finalExpression,
out ActivationStrategyDelegate newDelegate)
{
newDelegate = null;
try
{
var request = new DynamicMethodGenerationRequest(expressionContext, TryGenerateIL);
var constants = new List <object>();
if (!ImplementationFactory.Locate <IConstantExpressionCollector>().GetConstantExpressions(finalExpression, constants))
{
return(false);
}
request.Constants = constants;
var target = ImplementationFactory.Locate <IDynamicMethodTargetCreator>().CreateMethodTarget(request);
if (target == null)
{
return(false);
}
request.Target = target;
var method = new DynamicMethod(string.Empty,
typeof(object),
new[]
{
target.GetType(),
typeof(IExportLocatorScope),
typeof(IDisposalScope),
typeof(IInjectionContext)
},
target.GetType(),
true);
request.ILGenerator = method.GetILGenerator();
if (!TryGenerateIL(request, finalExpression))
{
return(false);
}
request.ILGenerator.Emit(OpCodes.Ret);
newDelegate = (ActivationStrategyDelegate)method.CreateDelegate(typeof(ActivationStrategyDelegate), target);
return(true);
}
catch (Exception)
{
// ignore exception and compile linq expression normally
}
return(false);
}
/// <summary>
/// Generate IL for ParameterExpression
/// </summary>
/// <param name="request">request</param>
/// <param name="expression">expression</param>
/// <returns></returns>
public bool GenerateIL(DynamicMethodGenerationRequest request, ParameterExpression expression)
{
var expressionConstants = request.ExpressionRequest.Constants;
if (expression == expressionConstants.ScopeParameter)
{
request.ILGenerator.Emit(OpCodes.Ldarg_1);
return(true);
}
if (expression == expressionConstants.RootDisposalScope)
{
request.ILGenerator.Emit(OpCodes.Ldarg_2);
return(true);
}
if (expression == expressionConstants.InjectionContextParameter)
{
request.ILGenerator.Emit(OpCodes.Ldarg_3);
return(true);
}
for (int i = 0; i < request.ExtraParameters.Length; i++)
{
if (expression == request.ExtraParameters[i])
{
switch (i)
{
case 0:
request.ILGenerator.Emit(OpCodes.Ldloc_0);
return(true);
case 1:
request.ILGenerator.Emit(OpCodes.Ldloc_1);
return(true);
case 2:
request.ILGenerator.Emit(OpCodes.Ldloc_2);
return(true);
case 3:
request.ILGenerator.Emit(OpCodes.Ldloc_3);
return(true);
default:
request.ILGenerator.Emit(OpCodes.Ldloc_S, i);
return(true);
}
}
}
return(false);
}
/// <summary>
/// Generate IL for new expression
/// </summary>
/// <param name="request">request</param>
/// <param name="expression">expression</param>
/// <returns></returns>
public bool GenerateIL(DynamicMethodGenerationRequest request, NewExpression expression)
{
if (expression.Arguments.Any(argument => !request.TryGenerateIL(request, argument)))
{
return(false);
}
request.ILGenerator.Emit(OpCodes.Newobj, expression.Constructor);
return(true);
}
/// <summary>
/// Try to create IL from linq expression, this is called recursively as the expression is walked
/// </summary>
/// <param name="request">request</param>
/// <param name="expression">expression to convert</param>
/// <returns></returns>
protected virtual bool TryGenerateIL(DynamicMethodGenerationRequest request, Expression expression)
{
if (expression == null)
{
return(true);
}
switch (expression.NodeType)
{
case ExpressionType.Call:
return(ImplementationFactory.Locate <ICallExpressionGenerator>()
.GenerateIL(request, (MethodCallExpression)expression));
case ExpressionType.Constant:
return(ImplementationFactory.Locate <IConstantExpressionGenerator>()
.GenerateIL(request, (ConstantExpression)expression));
case ExpressionType.Convert:
if (TryGenerateIL(request, ((UnaryExpression)expression).Operand))
{
request.ILGenerator.Emit(OpCodes.Castclass, expression.Type);
return(true);
}
return(false);
case ExpressionType.MemberInit:
return(ImplementationFactory.Locate <IMemeberInitExpressionGenerator>()
.GenerateIL(request, (MemberInitExpression)expression));
case ExpressionType.New:
return(ImplementationFactory.Locate <INewExpressionGenerator>()
.GenerateIL(request, (NewExpression)expression));
case ExpressionType.NewArrayInit:
return(ImplementationFactory.Locate <IArrayInitExpressionGenerator>()
.GenerateIL(request, (NewArrayExpression)expression));
case ExpressionType.Parameter:
return(ImplementationFactory.Locate <IParameterExpressionGenerator>()
.GenerateIL(request, (ParameterExpression)expression));
case ExpressionType.Assign:
return(ImplementationFactory.Locate <IAssignExpressionGenerator>()
.GenerateIL(request, (BinaryExpression)expression));
default:
request.ToString();
break;
}
return(false);
}
/// <summary>
/// Generate IL for member init expression
/// </summary>
/// <param name="request">request</param>
/// <param name="expression">expression</param>
/// <returns></returns>
public bool GenerateIL(DynamicMethodGenerationRequest request, MemberInitExpression expression)
{
if (!request.TryGenerateIL(request, expression.NewExpression))
{
return(false);
}
var instance = request.ILGenerator.DeclareLocal(expression.Type);
request.ILGenerator.Emit(OpCodes.Stloc, instance);
foreach (var binding in expression.Bindings)
{
if (binding.BindingType != MemberBindingType.Assignment)
{
return(false);
}
request.ILGenerator.Emit(OpCodes.Ldloc, instance);
if (!request.TryGenerateIL(request, ((MemberAssignment)binding).Expression))
{
return(false);
}
var propertyInfo = binding.Member as PropertyInfo;
if (propertyInfo != null)
{
var setMethod = propertyInfo.SetMethod;
if (setMethod == null)
{
return(false);
}
request.ILGenerator.EmitMethodCall(setMethod);
}
else if (binding.Member is FieldInfo)
{
request.ILGenerator.Emit(OpCodes.Stfld, (FieldInfo)binding.Member);
}
else
{
return(false);
}
}
request.ILGenerator.Emit(OpCodes.Ldloc, instance);
return(true);
}
/// <summary>
/// Generate IL for method call expression
/// </summary>
/// <param name="request">dynamic method request</param>
/// <param name="expression">expression to convert</param>
/// <returns></returns>
public bool GenerateIL(DynamicMethodGenerationRequest request, MethodCallExpression expression)
{
if (!request.TryGenerateIL(request, expression.Object))
{
return(false);
}
if (expression.Arguments.Any(expressionArgument => !request.TryGenerateIL(request, expressionArgument)))
{
return(false);
}
request.ILGenerator.EmitMethodCall(expression.Method);
return(true);
}
/// <summary>
/// Generate IL for new array expression
/// </summary>
/// <param name="request">request for generation</param>
/// <param name="expression">expression to convert</param>
/// <returns></returns>
public bool GenerateIL(DynamicMethodGenerationRequest request, NewArrayExpression expression)
{
var arrayType = expression.Type;
var elementType = arrayType.GetElementType();
var elementIsValueType = elementType.GetTypeInfo().IsValueType;
var arrayInstance = request.ILGenerator.DeclareLocal(arrayType);
request.ILGenerator.EmitInt(expression.Expressions.Count);
request.ILGenerator.Emit(OpCodes.Newarr, elementType);
request.ILGenerator.Emit(OpCodes.Stloc, arrayInstance);
var index = 0;
foreach (var instanceExpression in expression.Expressions)
{
request.ILGenerator.Emit(OpCodes.Ldloc, arrayInstance);
request.ILGenerator.EmitInt(index);
index++;
if (elementIsValueType)
{
request.ILGenerator.Emit(OpCodes.Ldelema, elementType);
}
if (!request.TryGenerateIL(request, instanceExpression))
{
return(false);
}
if (elementIsValueType)
{
request.ILGenerator.Emit(OpCodes.Stobj, elementType);
}
else
{
request.ILGenerator.Emit(OpCodes.Stelem_Ref);
}
}
request.ILGenerator.Emit(OpCodes.Ldloc, arrayInstance);
return(true);
}
private object CreateConstantTarget(DynamicMethodGenerationRequest request)
{
Type openType = null;
switch (request.Constants.Count)
{
case 1:
openType = typeof(DynamicMethodTarget <>);
break;
case 2:
openType = typeof(DynamicMethodTarget <,>);
break;
case 3:
openType = typeof(DynamicMethodTarget <, ,>);
break;
case 4:
openType = typeof(DynamicMethodTarget <, , ,>);
break;
case 5:
openType = typeof(DynamicMethodTarget <, , , ,>);
break;
case 6:
openType = typeof(DynamicMethodTarget <, , , , ,>);
break;
case 7:
openType = typeof(DynamicMethodTarget <, , , , , ,>);
break;
case 8:
openType = typeof(DynamicMethodTarget <, , , , , , ,>);
break;
default:
return(CreateArrayTarget(request));
}
var closedType = openType.MakeGenericType(request.Constants.Select(c => c.GetType()).ToArray());
return(Activator.CreateInstance(closedType, request.Constants.ToArray()));
}
private bool ProcessConstantFromTarget(DynamicMethodGenerationRequest request, ConstantExpression expression)
{
var constantIndex = request.Constants.IndexOf(expression.Value);
if (constantIndex < 0)
{
return(false);
}
constantIndex++;
var field = request.Target.GetType().GetRuntimeField("TArg" + constantIndex);
request.ILGenerator.Emit(OpCodes.Ldarg_0);
request.ILGenerator.Emit(OpCodes.Ldfld, field);
return(true);
}
/// <summary>
/// Generate IL for a constant expression
/// </summary>
/// <param name="request">dynamic request</param>
/// <param name="expression">constant expression to convert</param>
/// <returns></returns>
public bool GenerateIL(DynamicMethodGenerationRequest request, ConstantExpression expression)
{
if (expression.Value == null)
{
request.ILGenerator.Emit(OpCodes.Ldnull);
return(true);
}
var expressionType = expression.Type;
if (expressionType == typeof(int))
{
request.ILGenerator.EmitInt((int)expression.Value);
}
else if (expressionType == typeof(string))
{
request.ILGenerator.Emit(OpCodes.Ldstr, (string)expression.Value);
}
else if (expressionType == typeof(bool))
{
request.ILGenerator.Emit((bool)expression.Value ? OpCodes.Ldc_I4_1 : OpCodes.Ldc_I4_0);
}
else if (expressionType == typeof(double))
{
request.ILGenerator.Emit(OpCodes.Ldc_R8, (double)expression.Value);
}
else if (request.IsArrayTarget)
{
return(ProcessConstantFromArrayTarget(request, expression));
}
else
{
return(ProcessConstantFromTarget(request, expression));
}
return(true);
}
/// <summary>
/// Generate IL for assign statement
/// </summary>
/// <param name="request"></param>
/// <param name="expression"></param>
/// <returns></returns>
public bool GenerateIL(DynamicMethodGenerationRequest request, BinaryExpression expression)
{
if (request.TryGenerateIL(request, expression.Right))
{
for (int i = 0; i < request.ExtraParameters.Length; i++)
{
if (expression.Left == request.ExtraParameters[i])
{
switch (i)
{
case 0:
request.ILGenerator.Emit(OpCodes.Stloc_0);
return(true);
case 1:
request.ILGenerator.Emit(OpCodes.Stloc_1);
return(true);
case 2:
request.ILGenerator.Emit(OpCodes.Stloc_2);
return(true);
case 3:
request.ILGenerator.Emit(OpCodes.Stloc_3);
return(true);
default:
request.ILGenerator.Emit(OpCodes.Stloc_S, i);
return(true);
}
}
}
}
return(false);
}
/// <summary>
/// Try to create IL from linq expression, this is called recursively as the expression is walked
/// </summary>
/// <param name="request">request</param>
/// <param name="expression">expression to convert</param>
/// <returns></returns>
protected virtual bool TryGenerateIL(DynamicMethodGenerationRequest request, Expression expression)
{
if (expression == null)
{
return(true);
}
switch (expression.NodeType)
{
case ExpressionType.Call:
return(ImplementationFactory.Locate <ICallExpressionGenerator>()
.GenerateIL(request, (MethodCallExpression)expression));
case ExpressionType.Constant:
return(ImplementationFactory.Locate <IConstantExpressionGenerator>()
.GenerateIL(request, (ConstantExpression)expression));
case ExpressionType.MemberInit:
return(ImplementationFactory.Locate <IMemeberInitExpressionGenerator>()
.GenerateIL(request, (MemberInitExpression)expression));
case ExpressionType.New:
return(ImplementationFactory.Locate <INewExpressionGenerator>()
.GenerateIL(request, (NewExpression)expression));
case ExpressionType.NewArrayInit:
return(ImplementationFactory.Locate <IArrayInitExpressionGenerator>()
.GenerateIL(request, (NewArrayExpression)expression));
case ExpressionType.Parameter:
return(ImplementationFactory.Locate <IParameterExpressionGenerator>()
.GenerateIL(request, (ParameterExpression)expression));
}
return(false);
}
/// <summary>
/// try to create delegate using IL generation
/// </summary>
/// <param name="expressionContext">expression context</param>
/// <param name="parameters"></param>
/// <param name="extraExpressions"></param>
/// <param name="finalExpression">final expression to convert</param>
/// <param name="newDelegateType">created delegate</param>
/// <returns>true if delegate was created</returns>
public virtual Delegate TryCreateDelegate(IActivationExpressionResult expressionContext, ParameterExpression[] parameters, Expression[] extraExpressions, Expression finalExpression, Type newDelegateType)
{
try
{
var request = new DynamicMethodGenerationRequest(expressionContext, TryGenerateIL, parameters);
var constants = new List <object>();
foreach (var expression in extraExpressions)
{
if (!ImplementationFactory.Locate <IConstantExpressionCollector>().GetConstantExpressions(expression, constants))
{
return(null);
}
}
if (!ImplementationFactory.Locate <IConstantExpressionCollector>().GetConstantExpressions(finalExpression, constants))
{
return(null);
}
request.Constants = constants;
var target = ImplementationFactory.Locate <IDynamicMethodTargetCreator>().CreateMethodTarget(request);
request.Target = target;
var invokeMethod = newDelegateType.GetTypeInfo().GetDeclaredMethod("Invoke");
var parameterTypes = new List <Type>();
if (target != null)
{
parameterTypes.Add(target.GetType());
}
parameterTypes.AddRange(invokeMethod.GetParameters().Select(p => p.ParameterType));
var method = new DynamicMethod(string.Empty,
invokeMethod.ReturnType,
parameterTypes.ToArray(),
typeof(LinqToDynamicMethodConverter),
true);
request.ILGenerator = method.GetILGenerator();
foreach (var parameter in parameters)
{
request.ILGenerator.DeclareLocal(parameter.Type);
}
foreach (var expression in extraExpressions)
{
if (!TryGenerateIL(request, expression))
{
return(null);
}
}
if (!TryGenerateIL(request, finalExpression))
{
return(null);
}
request.ILGenerator.Emit(OpCodes.Ret);
return(method.CreateDelegate(newDelegateType, target));
}
catch (Exception exp)
{
expressionContext.Request.RequestingScope.ScopeConfiguration.Trace?.Invoke($"Exception thrown while compiling dynamic method {exp.Message}");
}
return(null);
}
private object CreateArrayTarget(DynamicMethodGenerationRequest request)
{
request.IsArrayTarget = true;
return(new ArrayDynamicMethodTarget(request.Constants.ToArray()));
}
/// <summary>
/// try to create delegate using IL generation
/// </summary>
/// <param name="expressionContext">expression context</param>
/// <param name="parameters"></param>
/// <param name="extraExpressions"></param>
/// <param name="finalExpression">final expression to convert</param>
/// <param name="newDelegate">created delegate</param>
/// <returns>true if delegate was created</returns>
public virtual bool TryCreateDelegate(IActivationExpressionResult expressionContext, ParameterExpression[] parameters, Expression[] extraExpressions, Expression finalExpression, out ActivationStrategyDelegate newDelegate)
{
newDelegate = null;
try
{
var request = new DynamicMethodGenerationRequest(expressionContext, TryGenerateIL, parameters);
var constants = new List <object>();
foreach (var expression in extraExpressions)
{
if (!ImplementationFactory.Locate <IConstantExpressionCollector>().GetConstantExpressions(expression, constants))
{
return(false);
}
}
if (!ImplementationFactory.Locate <IConstantExpressionCollector>().GetConstantExpressions(finalExpression, constants))
{
return(false);
}
request.Constants = constants;
var target = ImplementationFactory.Locate <IDynamicMethodTargetCreator>().CreateMethodTarget(request);
if (target == null)
{
return(false);
}
request.Target = target;
var method = new DynamicMethod(string.Empty,
typeof(object),
new[]
{
target.GetType(),
typeof(IExportLocatorScope),
typeof(IDisposalScope),
typeof(IInjectionContext)
},
target.GetType(),
true);
request.ILGenerator = method.GetILGenerator();
foreach (var parameter in parameters)
{
request.ILGenerator.DeclareLocal(parameter.Type);
}
foreach (var expression in extraExpressions)
{
if (!TryGenerateIL(request, expression))
{
return(false);
}
}
if (!TryGenerateIL(request, finalExpression))
{
return(false);
}
request.ILGenerator.Emit(OpCodes.Ret);
newDelegate = (ActivationStrategyDelegate)method.CreateDelegate(typeof(ActivationStrategyDelegate), target);
return(true);
}
catch (Exception exp)
{
expressionContext.Request.RequestingScope.ScopeConfiguration.Trace?.Invoke($"Exception thrown while compiling dynamic method {exp.Message}");
}
return(false);
}
/// <summary>
/// Create method target based on request
/// </summary>
/// <param name="request">dynamic method request</param>
/// <returns></returns>
public object CreateMethodTarget(DynamicMethodGenerationRequest request)
{
return(request.Constants.Count == 0 ? new DynamicMethodTarget() : CreateConstantTarget(request));
}