internal static bool IsValidScopeDesignator(this ExpressionSyntax expression)
{
// All these nodes are valid scope designators due to the pattern matching and out vars features.
CSharpSyntaxNode parent = expression?.Parent;
switch (parent?.Kind())
{
case SyntaxKind.SimpleLambdaExpression:
case SyntaxKind.ParenthesizedLambdaExpression:
return(((LambdaExpressionSyntax)parent).Body == expression);
case SyntaxKind.SwitchStatement:
return(((SwitchStatementSyntax)parent).Expression == expression);
case SyntaxKind.ForStatement:
return(((ForStatementSyntax)parent).Expression == expression);
default:
return(false);
}
}
private void VisitLambdaExpression(LambdaExpressionSyntax node)
{
// Do not descend into a lambda unless it is a root node
if (_root != node)
{
return;
}
CSharpSyntaxNode body = node.Body;
if (body.Kind() == SyntaxKind.Block)
{
VisitBlock((BlockSyntax)body);
}
else
{
var binder = new ExpressionVariableBinder(body, _enclosing);
AddToMap(body, binder);
Visit(body, binder);
}
}
internal protected override CSharpSyntaxNode GetBindableSyntaxNode(CSharpSyntaxNode node)
{
switch (node.Kind())
{
case SyntaxKind.Attribute:
return(node);
case SyntaxKind.AttributeArgument:
// Try to walk up to the AttributeSyntax
var parent = node.Parent;
if (parent != null)
{
parent = parent.Parent;
if (parent != null)
{
return(parent);
}
}
break;
}
return(base.GetBindableSyntaxNode(node));
}
// An anonymous function can be of the form:
//
// delegate { } (missing parameter list)
// delegate (int x) { } (typed parameter list)
// x => ... (type-inferred parameter list)
// (x) => ... (type-inferred parameter list)
// (x, y) => ... (type-inferred parameter list)
// ( ) => ... (typed parameter list)
// (ref int x) => ... (typed parameter list)
// (int x, out int y) => ... (typed parameter list)
//
// and so on. We want to canonicalize these various ways of writing the signatures.
//
// If we are in the first case then the name, modifier and type arrays are all null.
// If we have a parameter list then the names array is non-null, but possibly empty.
// If we have types then the types array is non-null, but possibly empty.
// If we have no modifiers then the modifiers array is null; if we have any modifiers
// then the modifiers array is non-null and not empty.
private Tuple <ImmutableArray <RefKind>, ImmutableArray <TypeSymbolWithAnnotations>, ImmutableArray <string>, bool> AnalyzeAnonymousFunction(
CSharpSyntaxNode syntax, DiagnosticBag diagnostics)
{
Debug.Assert(syntax != null);
Debug.Assert(syntax.IsAnonymousFunction());
var names = default(ImmutableArray <string>);
var refKinds = default(ImmutableArray <RefKind>);
var types = default(ImmutableArray <TypeSymbolWithAnnotations>);
bool isAsync = false;
var namesBuilder = ArrayBuilder <string> .GetInstance();
SeparatedSyntaxList <ParameterSyntax>?parameterSyntaxList = null;
bool hasSignature;
switch (syntax.Kind())
{
default:
case SyntaxKind.SimpleLambdaExpression:
// x => ...
hasSignature = true;
var simple = (SimpleLambdaExpressionSyntax)syntax;
namesBuilder.Add(simple.Parameter.Identifier.ValueText);
isAsync = (simple.AsyncKeyword.Kind() == SyntaxKind.AsyncKeyword);
break;
case SyntaxKind.ParenthesizedLambdaExpression:
// (T x, U y) => ...
// (x, y) => ...
hasSignature = true;
var paren = (ParenthesizedLambdaExpressionSyntax)syntax;
parameterSyntaxList = paren.ParameterList.Parameters;
CheckParenthesizedLambdaParameters(parameterSyntaxList.Value, diagnostics);
isAsync = (paren.AsyncKeyword.Kind() == SyntaxKind.AsyncKeyword);
break;
case SyntaxKind.AnonymousMethodExpression:
// delegate (int x) { }
// delegate { }
var anon = (AnonymousMethodExpressionSyntax)syntax;
hasSignature = anon.ParameterList != null;
if (hasSignature)
{
parameterSyntaxList = anon.ParameterList.Parameters;
}
isAsync = (anon.AsyncKeyword.Kind() == SyntaxKind.AsyncKeyword);
break;
}
if (parameterSyntaxList != null)
{
var hasExplicitlyTypedParameterList = true;
var allValue = true;
var typesBuilder = ArrayBuilder <TypeSymbolWithAnnotations> .GetInstance();
var refKindsBuilder = ArrayBuilder <RefKind> .GetInstance();
// In the batch compiler case we probably should have given a syntax error if the
// user did something like (int x, y)=>x+y -- but in the IDE scenario we might be in
// this case. If we are, then rather than try to make partial deductions from the
// typed formal parameters, simply bail out and treat it as an untyped lambda.
//
// However, we still want to give errors on every bad type in the list, even if one
// is missing.
foreach (var p in parameterSyntaxList.Value)
{
foreach (var attributeList in p.AttributeLists)
{
Error(diagnostics, ErrorCode.ERR_AttributesNotAllowed, attributeList);
}
if (p.Default != null)
{
Error(diagnostics, ErrorCode.ERR_DefaultValueNotAllowed, p.Default.EqualsToken);
}
if (p.IsArgList)
{
Error(diagnostics, ErrorCode.ERR_IllegalVarArgs, p);
continue;
}
var typeSyntax = p.Type;
TypeSymbolWithAnnotations type = default;
var refKind = RefKind.None;
if (typeSyntax == null)
{
hasExplicitlyTypedParameterList = false;
}
else
{
var extendedSyntax = typeSyntax as ExtendedTypeSyntax;
type = BindType(typeSyntax, diagnostics);
if (extendedSyntax != null)
{
foreach (var modifier in extendedSyntax.Modifiers)
{
switch (modifier.Kind())
{
case SyntaxKind.RefKeyword:
refKind = RefKind.Ref;
allValue = false;
break;
case SyntaxKind.OutKeyword:
refKind = RefKind.Out;
allValue = false;
break;
case SyntaxKind.InKeyword:
refKind = RefKind.In;
allValue = false;
break;
case SyntaxKind.ParamsKeyword:
// This was a parse error in the native compiler;
// it is a semantic analysis error in Roslyn. See comments to
// changeset 1674 for details.
Error(diagnostics, ErrorCode.ERR_IllegalParams, p);
break;
case SyntaxKind.ThisKeyword:
Error(diagnostics, ErrorCode.ERR_ThisInBadContext, modifier);
break;
}
}
}
}
namesBuilder.Add(p.Identifier.ValueText);
typesBuilder.Add(type);
refKindsBuilder.Add(refKind);
}
if (hasExplicitlyTypedParameterList)
{
types = typesBuilder.ToImmutable();
}
if (!allValue)
{
refKinds = refKindsBuilder.ToImmutable();
}
typesBuilder.Free();
refKindsBuilder.Free();
}
if (hasSignature)
{
names = namesBuilder.ToImmutable();
}
namesBuilder.Free();
return(Tuple.Create(refKinds, types, names, isAsync));
}
internal static ImmutableArray <DocumentationCommentTriviaSyntax> GetDocumentationCommentTriviaFromSyntaxNode(CSharpSyntaxNode syntaxNode, DiagnosticBag diagnostics)
{
if (syntaxNode.SyntaxTree.Options.DocumentationMode < DocumentationMode.Parse)
{
return(ImmutableArray <DocumentationCommentTriviaSyntax> .Empty);
}
// All declarators in a declaration get the same doc comment.
// (As a consequence, the same duplicate diagnostics are produced for each declarator.)
if (syntaxNode.Kind() == SyntaxKind.VariableDeclaration)
{
CSharpSyntaxNode curr = syntaxNode;
while ((object)curr != null)
{
SyntaxKind kind = curr.Kind();
if (kind == SyntaxKind.FieldDeclaration || kind == SyntaxKind.EventFieldDeclaration)
{
break;
}
curr = curr.Parent;
}
if ((object)curr != null)
{
syntaxNode = curr;
}
}
ArrayBuilder <DocumentationCommentTriviaSyntax> builder = null;
bool seenOtherTrivia = false;
foreach (var trivia in syntaxNode.GetLeadingTrivia().Reverse())
{
switch (trivia.Kind())
{
case SyntaxKind.SingleLineDocumentationCommentTrivia:
case SyntaxKind.MultiLineDocumentationCommentTrivia:
{
if (seenOtherTrivia)
{
// In most cases, unprocessed doc comments are reported by UnprocessedDocumentationCommentFinder.
// However, in places where doc comments *are* allowed, it's easier to determine which will
// be unprocessed here.
var tree = (SyntaxTree)trivia.SyntaxTree;
if (tree.ReportDocumentationCommentDiagnostics())
{
int start = trivia.Position; // FullSpan start to include /** or ///
const int length = 1; //Match dev11: span is just one character
diagnostics.Add(ErrorCode.WRN_UnprocessedXMLComment, new SourceLocation(tree, new TextSpan(start, length)));
}
}
else
{
if (builder == null)
{
builder = ArrayBuilder <DocumentationCommentTriviaSyntax> .GetInstance();
}
builder.Add((DocumentationCommentTriviaSyntax)trivia.GetStructure());
}
break;
}
case SyntaxKind.WhitespaceTrivia:
case SyntaxKind.EndOfLineTrivia:
// These can legally appear between doc comments.
break;
default:
// For some reason, dev11 ignores trivia between the last doc comment and the
// symbol declaration. (e.g. can have regular comment between doc comment and decl).
if (builder != null)
{
seenOtherTrivia = true;
}
break;
}
}
if (builder == null)
{
return(ImmutableArray <DocumentationCommentTriviaSyntax> .Empty);
}
builder.ReverseContents();
return(builder.ToImmutableAndFree());
}
public static Imports FromSyntax(
CSharpSyntaxNode declarationSyntax,
InContainerBinder binder,
ConsList <TypeSymbol> basesBeingResolved,
bool inUsing)
{
SyntaxList <ImportDirectiveSyntax> usingDirectives;
SyntaxList <ExternAliasDirectiveSyntax> externAliasDirectives;
if (declarationSyntax.Kind() == SyntaxKind.CompilationUnit)
{
var compilationUnit = (CompilationUnitSyntax)declarationSyntax;
// using directives are not in scope within using directives
usingDirectives = inUsing ? default(SyntaxList <ImportDirectiveSyntax>) : compilationUnit.Usings;
externAliasDirectives = compilationUnit.Externs;
}
else if (declarationSyntax.Kind() == SyntaxKind.NamespaceDeclaration)
{
var namespaceDecl = (NamespaceDeclarationSyntax)declarationSyntax;
// using directives are not in scope within using directives
usingDirectives = inUsing ? default(SyntaxList <ImportDirectiveSyntax>) : namespaceDecl.Usings;
externAliasDirectives = namespaceDecl.Externs;
}
else
{
return(Empty);
}
if (usingDirectives.Count == 0 && externAliasDirectives.Count == 0)
{
return(Empty);
}
// define all of the extern aliases first. They may used by the target of a using
// using Bar=Goo::Bar;
// using Goo::Baz;
// extern alias Goo;
var diagnostics = new DiagnosticBag();
var compilation = binder.Compilation;
var externAliases = BuildExternAliases(externAliasDirectives, binder, diagnostics);
var usings = ArrayBuilder <NamespaceOrTypeAndImportDirective> .GetInstance();
ImmutableDictionary <string, AliasAndImportDirective> .Builder usingAliases = null;
if (usingDirectives.Count > 0)
{
// A binder that contains the extern aliases but not the usings. The resolution of the target of a using directive or alias
// should not make use of other peer usings.
Binder usingsBinder;
if (declarationSyntax.SyntaxTree.Options.Kind != SourceCodeKind.Regular)
{
usingsBinder = compilation.GetBinderFactory(declarationSyntax.SyntaxTree).GetImportsBinder(declarationSyntax, inUsing: true);
}
else
{
var imports = externAliases.Length == 0
? Empty
: new Imports(
compilation,
ImmutableDictionary <string, AliasAndImportDirective> .Empty,
ImmutableArray <NamespaceOrTypeAndImportDirective> .Empty,
externAliases,
diagnostics: null);
usingsBinder = new InContainerBinder(binder.Container, binder.Next, imports);
}
var uniqueUsings = PooledHashSet <NamespaceOrTypeSymbol> .GetInstance();
foreach (var usingDirective in usingDirectives)
{
compilation.RecordImport(usingDirective);
if (usingDirective.Alias != null)
{
if (usingDirective.Alias.Name.Identifier.ContextualKind() == SyntaxKind.GlobalKeyword)
{
diagnostics.Add(ErrorCode.WRN_GlobalAliasDefn, usingDirective.Alias.Name.Location);
}
if (usingDirective.StaticKeyword != default(SyntaxToken))
{
diagnostics.Add(ErrorCode.ERR_NoAliasHere, usingDirective.Alias.Name.Location);
}
string identifierValueText = usingDirective.Alias.Name.Identifier.ValueText;
if (usingAliases != null && usingAliases.ContainsKey(identifierValueText))
{
// Suppress diagnostics if we're already broken.
if (!usingDirective.Name.IsMissing)
{
// The using alias '{0}' appeared previously in this namespace
diagnostics.Add(ErrorCode.ERR_DuplicateAlias, usingDirective.Alias.Name.Location, identifierValueText);
}
}
else
{
// an O(m*n) algorithm here but n (number of extern aliases) will likely be very small.
foreach (var externAlias in externAliases)
{
if (externAlias.Alias.Name == identifierValueText)
{
// The using alias '{0}' appeared previously in this namespace
diagnostics.Add(ErrorCode.ERR_DuplicateAlias, usingDirective.Location, identifierValueText);
break;
}
}
if (usingAliases == null)
{
usingAliases = ImmutableDictionary.CreateBuilder <string, AliasAndImportDirective>();
}
// construct the alias sym with the binder for which we are building imports. That
// way the alias target can make use of extern alias definitions.
usingAliases.Add(identifierValueText, new AliasAndImportDirective(new AliasSymbol(usingsBinder, usingDirective), usingDirective));
}
}
else
{
if (usingDirective.Name.IsMissing)
{
//don't try to lookup namespaces inserted by parser error recovery
continue;
}
var declarationBinder = usingsBinder.WithAdditionalFlags(BinderFlags.SuppressConstraintChecks);
var imported = declarationBinder.BindNamespaceOrTypeSymbol(usingDirective.Name, diagnostics, basesBeingResolved).NamespaceOrTypeSymbol;
if (imported.Kind == SymbolKind.Namespace)
{
if (usingDirective.StaticKeyword != default(SyntaxToken))
{
diagnostics.Add(ErrorCode.ERR_BadUsingType, usingDirective.Name.Location, imported);
}
else if (uniqueUsings.Contains(imported))
{
diagnostics.Add(ErrorCode.WRN_DuplicateUsing, usingDirective.Name.Location, imported);
}
else
{
uniqueUsings.Add(imported);
usings.Add(new NamespaceOrTypeAndImportDirective(imported, usingDirective));
}
}
else if (imported.Kind == SymbolKind.NamedType)
{
var importedType = (NamedTypeSymbol)imported;
if (uniqueUsings.Contains(importedType))
{
diagnostics.Add(ErrorCode.WRN_DuplicateUsing, usingDirective.Name.Location, importedType);
}
else
{
declarationBinder.ReportDiagnosticsIfObsolete(diagnostics, importedType, usingDirective.Name, hasBaseReceiver: false);
uniqueUsings.Add(importedType);
usings.Add(new NamespaceOrTypeAndImportDirective(importedType, usingDirective));
}
}
else if (imported.Kind != SymbolKind.ErrorType)
{
// Do not report additional error if the symbol itself is erroneous.
// error: '<symbol>' is a '<symbol kind>' but is used as 'type or namespace'
diagnostics.Add(ErrorCode.ERR_BadSKknown, usingDirective.Name.Location,
usingDirective.Name,
imported.GetKindText(),
MessageID.IDS_SK_TYPE_OR_NAMESPACE.Localize());
}
}
}
uniqueUsings.Free();
}
if (diagnostics.IsEmptyWithoutResolution)
{
diagnostics = null;
}
return(new Imports(compilation, usingAliases.ToImmutableDictionaryOrEmpty(), usings.ToImmutableAndFree(), externAliases, diagnostics));
}