private BoundLambda ReallyBind(NamedTypeSymbol delegateType)
{
var returnType = DelegateReturnType(delegateType);
LambdaSymbol lambdaSymbol;
Binder lambdaBodyBinder;
BoundBlock block;
var diagnostics = DiagnosticBag.GetInstance();
// when binding for real (not for return inference), there is still
// a good chance that we could reuse a body of a lambda previously bound for
// return type inference.
MethodSymbol cacheKey = GetCacheKey(delegateType);
BoundLambda returnInferenceLambda;
if (returnInferenceCache.TryGetValue(cacheKey, out returnInferenceLambda) && returnInferenceLambda.InferredFromSingleType)
{
var lambdaSym = returnInferenceLambda.Symbol;
var lambdaRetType = lambdaSym.ReturnType;
if (lambdaRetType == returnType)
{
lambdaSymbol = lambdaSym;
lambdaBodyBinder = returnInferenceLambda.Binder;
block = returnInferenceLambda.Body;
diagnostics.AddRange(returnInferenceLambda.Diagnostics);
goto haveLambdaBodyAndBinders;
}
}
var parameters = DelegateParameters(delegateType);
lambdaSymbol = new LambdaSymbol(binder.Compilation, binder.ContainingMemberOrLambda, this.unboundLambda, parameters, returnType);
lambdaBodyBinder = new ExecutableCodeBinder(this.unboundLambda.Syntax, lambdaSymbol, ParameterBinder(lambdaSymbol, binder));
block = BindLambdaBody(lambdaSymbol, ref lambdaBodyBinder, diagnostics);
ValidateUnsafeParameters(diagnostics, parameters);
haveLambdaBodyAndBinders:
bool reachableEndpoint = ControlFlowPass.Analyze(binder.Compilation, lambdaSymbol, block, diagnostics);
if (reachableEndpoint)
{
if (DelegateNeedsReturn(delegateType))
{
// Not all code paths return a value in {0} of type '{1}'
diagnostics.Add(ErrorCode.ERR_AnonymousReturnExpected, lambdaSymbol.Locations[0], this.MessageID.Localize(), delegateType);
}
else
{
block = FlowAnalysisPass.AppendImplicitReturn(block, lambdaSymbol, this.unboundLambda.Syntax);
}
}
if (IsAsync && !ErrorFacts.PreventsSuccessfulDelegateConversion(diagnostics))
{
if ((object)returnType != null && // Can be null if "delegateType" is not actually a delegate type.
returnType.SpecialType != SpecialType.System_Void &&
returnType != binder.Compilation.GetWellKnownType(WellKnownType.System_Threading_Tasks_Task) &&
returnType.OriginalDefinition != binder.Compilation.GetWellKnownType(WellKnownType.System_Threading_Tasks_Task_T))
{
// Cannot convert async {0} to delegate type '{1}'. An async {0} may return void, Task or Task<T>, none of which are convertible to '{1}'.
diagnostics.Add(ErrorCode.ERR_CantConvAsyncAnonFuncReturns, lambdaSymbol.Locations[0], lambdaSymbol.MessageID.Localize(), delegateType);
}
}
if (IsAsync)
{
Debug.Assert(lambdaSymbol.IsAsync);
SourceMemberMethodSymbol.ReportAsyncParameterErrors(lambdaSymbol, diagnostics, lambdaSymbol.Locations[0]);
}
var result = new BoundLambda(this.unboundLambda.Syntax, block, diagnostics.ToReadOnlyAndFree(), lambdaBodyBinder, delegateType)
{
WasCompilerGenerated = this.unboundLambda.WasCompilerGenerated
};
return(result);
}
/// <summary>
/// Introduce a frame around the translation of the given node.
/// </summary>
/// <param name="node">The node whose translation should be translated to contain a frame</param>
/// <param name="frame">The frame for the translated node</param>
/// <param name="F">A function that computes the translation of the node. It receives lists of added statements and added symbols</param>
/// <returns>The translated statement, as returned from F</returns>
private T IntroduceFrame <T>(BoundNode node, LambdaFrame frame, Func <ArrayBuilder <BoundExpression>, ArrayBuilder <LocalSymbol>, T> F)
{
NamedTypeSymbol frameType = frame.ConstructIfGeneric(StaticCast <TypeSymbol> .From(currentTypeParameters));
LocalSymbol framePointer = new LambdaFrameLocalSymbol(this.topLevelMethod, frameType, CompilationState);
CSharpSyntaxNode syntax = node.Syntax;
// assign new frame to the frame variable
CompilationState.AddSynthesizedMethod(frame.Constructor, FlowAnalysisPass.AppendImplicitReturn(MethodCompiler.BindMethodBody(frame.Constructor, CompilationState, null), frame.Constructor));
var prologue = ArrayBuilder <BoundExpression> .GetInstance();
MethodSymbol constructor = frame.Constructor.AsMember(frameType);
Debug.Assert(frameType == constructor.ContainingType);
var newFrame = new BoundObjectCreationExpression(
syntax: syntax,
constructor: constructor);
prologue.Add(new BoundAssignmentOperator(syntax,
new BoundLocal(syntax, framePointer, null, frameType),
newFrame,
frameType));
CapturedSymbolReplacement oldInnermostFrameProxy = null;
if ((object)innermostFramePointer != null)
{
proxies.TryGetValue(innermostFramePointer, out oldInnermostFrameProxy);
if (analysis.needsParentFrame.Contains(node))
{
var capturedFrame = new LambdaCapturedVariable(frame, innermostFramePointer);
FieldSymbol frameParent = capturedFrame.AsMember(frameType);
BoundExpression left = new BoundFieldAccess(syntax, new BoundLocal(syntax, framePointer, null, frameType), frameParent, null);
BoundExpression right = FrameOfType(syntax, frameParent.Type as NamedTypeSymbol);
BoundExpression assignment = new BoundAssignmentOperator(syntax, left, right, left.Type);
if (this.currentMethod.MethodKind == MethodKind.Constructor && capturedFrame.Type == this.currentMethod.ContainingType && !this.seenBaseCall)
{
// Containing method is a constructor
// Initialization statement for the "this" proxy must be inserted
// after the constructor initializer statement block
// This insertion will be done by the delegate F
Debug.Assert(thisProxyInitDeferred == null);
thisProxyInitDeferred = assignment;
}
else
{
prologue.Add(assignment);
}
if (CompilationState.Emitting)
{
CompilationState.ModuleBuilderOpt.AddSynthesizedDefinition(frame, capturedFrame);
}
proxies[innermostFramePointer] = new CapturedToFrameSymbolReplacement(capturedFrame);
}
}
// Capture any parameters of this block. This would typically occur
// at the top level of a method or lambda with captured parameters.
// TODO: speed up the following by computing it in analysis.
foreach (var v in analysis.variablesCaptured)
{
BoundNode varNode;
if (!analysis.variableBlock.TryGetValue(v, out varNode) ||
varNode != node ||
analysis.declaredInsideExpressionLambda.Contains(v))
{
continue;
}
InitVariableProxy(syntax, v, framePointer, prologue);
}
Symbol oldInnermostFramePointer = innermostFramePointer;
innermostFramePointer = framePointer;
var addedLocals = ArrayBuilder <LocalSymbol> .GetInstance();
addedLocals.Add(framePointer);
framePointers.Add(frame, framePointer);
var result = F(prologue, addedLocals);
framePointers.Remove(frame);
innermostFramePointer = oldInnermostFramePointer;
if ((object)innermostFramePointer != null)
{
if (oldInnermostFrameProxy != null)
{
proxies[innermostFramePointer] = oldInnermostFrameProxy;
}
else
{
proxies.Remove(innermostFramePointer);
}
}
return(result);
}
private BoundLambda ReallyBind(NamedTypeSymbol delegateType)
{
var invokeMethod = DelegateInvokeMethod(delegateType);
RefKind refKind;
var returnType = DelegateReturnType(invokeMethod, out refKind);
LambdaSymbol lambdaSymbol;
Binder lambdaBodyBinder;
BoundBlock block;
var diagnostics = DiagnosticBag.GetInstance();
// when binding for real (not for return inference), there is still
// a good chance that we could reuse a body of a lambda previously bound for
// return type inference.
var cacheKey = ReturnInferenceCacheKey.Create(delegateType, IsAsync);
BoundLambda returnInferenceLambda;
if (_returnInferenceCache.TryGetValue(cacheKey, out returnInferenceLambda) && returnInferenceLambda.InferredFromSingleType)
{
lambdaSymbol = returnInferenceLambda.Symbol;
if ((object)LambdaSymbol.InferenceFailureReturnType != lambdaSymbol.ReturnType &&
lambdaSymbol.ReturnType == returnType && lambdaSymbol.RefKind == refKind)
{
lambdaBodyBinder = returnInferenceLambda.Binder;
block = returnInferenceLambda.Body;
diagnostics.AddRange(returnInferenceLambda.Diagnostics);
goto haveLambdaBodyAndBinders;
}
}
lambdaSymbol = new LambdaSymbol(
binder.Compilation,
binder.ContainingMemberOrLambda,
_unboundLambda,
cacheKey.ParameterTypes,
cacheKey.ParameterRefKinds,
refKind,
returnType);
lambdaBodyBinder = new ExecutableCodeBinder(_unboundLambda.Syntax, lambdaSymbol, ParameterBinder(lambdaSymbol, binder));
block = BindLambdaBody(lambdaSymbol, lambdaBodyBinder, diagnostics);
((ExecutableCodeBinder)lambdaBodyBinder).ValidateIteratorMethods(diagnostics);
ValidateUnsafeParameters(diagnostics, cacheKey.ParameterTypes);
haveLambdaBodyAndBinders:
bool reachableEndpoint = ControlFlowPass.Analyze(binder.Compilation, lambdaSymbol, block, diagnostics);
if (reachableEndpoint)
{
if (DelegateNeedsReturn(invokeMethod))
{
// Not all code paths return a value in {0} of type '{1}'
diagnostics.Add(ErrorCode.ERR_AnonymousReturnExpected, lambdaSymbol.DiagnosticLocation, this.MessageID.Localize(), delegateType);
}
else
{
block = FlowAnalysisPass.AppendImplicitReturn(block, lambdaSymbol);
}
}
if (IsAsync && !ErrorFacts.PreventsSuccessfulDelegateConversion(diagnostics))
{
if ((object)returnType != null && // Can be null if "delegateType" is not actually a delegate type.
returnType.SpecialType != SpecialType.System_Void &&
!returnType.IsNonGenericTaskType(binder.Compilation) &&
!returnType.IsGenericTaskType(binder.Compilation))
{
// Cannot convert async {0} to delegate type '{1}'. An async {0} may return void, Task or Task<T>, none of which are convertible to '{1}'.
diagnostics.Add(ErrorCode.ERR_CantConvAsyncAnonFuncReturns, lambdaSymbol.DiagnosticLocation, lambdaSymbol.MessageID.Localize(), delegateType);
}
}
if (IsAsync)
{
Debug.Assert(lambdaSymbol.IsAsync);
SourceMemberMethodSymbol.ReportAsyncParameterErrors(lambdaSymbol.Parameters, diagnostics, lambdaSymbol.DiagnosticLocation);
}
var result = new BoundLambda(_unboundLambda.Syntax, block, diagnostics.ToReadOnlyAndFree(), lambdaBodyBinder, delegateType, inferReturnType: false)
{
WasCompilerGenerated = _unboundLambda.WasCompilerGenerated
};
return(result);
}
private BoundLambda ReallyBind(NamedTypeSymbol delegateType)
{
var invokeMethod = DelegateInvokeMethod(delegateType);
RefKind refKind;
var returnType = DelegateReturnType(invokeMethod, out refKind);
LambdaSymbol lambdaSymbol;
Binder lambdaBodyBinder;
BoundBlock block;
var diagnostics = DiagnosticBag.GetInstance();
// when binding for real (not for return inference), there is still
// a good chance that we could reuse a body of a lambda previously bound for
// return type inference.
MethodSymbol cacheKey = GetCacheKey(delegateType);
BoundLambda returnInferenceLambda;
if (_returnInferenceCache.TryGetValue(cacheKey, out returnInferenceLambda) && returnInferenceLambda.InferredFromSingleType && returnInferenceLambda.Symbol.ReturnType == returnType)
{
lambdaSymbol = returnInferenceLambda.Symbol;
Debug.Assert(lambdaSymbol.RefKind == refKind);
lambdaBodyBinder = returnInferenceLambda.Binder;
block = returnInferenceLambda.Body;
diagnostics.AddRange(returnInferenceLambda.Diagnostics);
goto haveLambdaBodyAndBinders;
}
var parameters = DelegateParameters(invokeMethod);
lambdaSymbol = new LambdaSymbol(
binder.Compilation,
binder.ContainingMemberOrLambda,
_unboundLambda,
parameters,
refKind,
returnType);
lambdaBodyBinder = new ExecutableCodeBinder(_unboundLambda.Syntax, lambdaSymbol, ParameterBinder(lambdaSymbol, binder));
block = BindLambdaBody(lambdaSymbol, lambdaBodyBinder, diagnostics);
((ExecutableCodeBinder)lambdaBodyBinder).ValidateIteratorMethods(diagnostics);
ValidateUnsafeParameters(diagnostics, parameters);
haveLambdaBodyAndBinders:
bool reachableEndpoint = ControlFlowPass.Analyze(binder.Compilation, lambdaSymbol, block, diagnostics);
if (reachableEndpoint)
{
if (DelegateNeedsReturn(invokeMethod))
{
// Not all code paths return a value in {0} of type '{1}'
diagnostics.Add(ErrorCode.ERR_AnonymousReturnExpected, lambdaSymbol.Locations[0], this.MessageID.Localize(), delegateType);
}
else
{
block = FlowAnalysisPass.AppendImplicitReturn(block, lambdaSymbol);
}
}
if (IsAsync && !ErrorFacts.PreventsSuccessfulDelegateConversion(diagnostics))
{
if ((object)returnType != null && // Can be null if "delegateType" is not actually a delegate type.
returnType.SpecialType != SpecialType.System_Void &&
!returnType.IsNonGenericTaskType(binder.Compilation) &&
!returnType.IsGenericTaskType(binder.Compilation))
{
// Cannot convert async {0} to delegate type '{1}'. An async {0} may return void, Task or Task<T>, none of which are convertible to '{1}'.
diagnostics.Add(ErrorCode.ERR_CantConvAsyncAnonFuncReturns, lambdaSymbol.Locations[0], lambdaSymbol.MessageID.Localize(), delegateType);
}
}
if (IsAsync)
{
Debug.Assert(lambdaSymbol.IsAsync);
SourceMemberMethodSymbol.ReportAsyncParameterErrors(lambdaSymbol.Parameters, diagnostics, lambdaSymbol.Locations[0]);
}
// This is an attempt to get a repro for https://devdiv.visualstudio.com/DevDiv/_workitems?id=278481
if ((object)returnType != null && returnType.SpecialType != SpecialType.System_Void &&
!block.HasErrors && !diagnostics.HasAnyResolvedErrors() && block.Statements.Length > 0)
{
BoundStatement first = block.Statements[0];
if (first.Kind == BoundKind.ReturnStatement)
{
var returnStmt = (BoundReturnStatement)first;
if (returnStmt.ExpressionOpt != null && (object)returnStmt.ExpressionOpt.Type == null)
{
throw ExceptionUtilities.Unreachable;
}
}
}
var result = new BoundLambda(_unboundLambda.Syntax, block, diagnostics.ToReadOnlyAndFree(), lambdaBodyBinder, delegateType, inferReturnType: false)
{
WasCompilerGenerated = _unboundLambda.WasCompilerGenerated
};
return(result);
}