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ResolveVisitor.cs
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ResolveVisitor.cs
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading;
using ICSharpCode.NRefactory.CSharp.Analysis;
using ICSharpCode.NRefactory.CSharp.TypeSystem;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.TypeSystem.Implementation;
namespace ICSharpCode.NRefactory.CSharp.Resolver
{
/// <summary>
/// Traverses the DOM and resolves expressions.
/// </summary>
/// <remarks>
/// The ResolveVisitor does two jobs at the same time: it tracks the resolve context (properties on CSharpResolver)
/// and it resolves the expressions visited.
/// To allow using the context tracking without having to resolve every expression in the file (e.g. when you want to resolve
/// only a single node deep within the DOM), you can use the <see cref="IResolveVisitorNavigator"/> interface.
/// The navigator allows you to switch the between scanning mode and resolving mode.
/// In scanning mode, the context is tracked (local variables registered etc.), but nodes are not resolved.
/// While scanning, the navigator will get asked about every node that the resolve visitor is about to enter.
/// This allows the navigator whether to keep scanning, whether switch to resolving mode, or whether to completely skip the
/// subtree rooted at that node.
///
/// In resolving mode, the context is tracked and nodes will be resolved.
/// The resolve visitor may decide that it needs to resolve other nodes as well in order to resolve the current node.
/// In this case, those nodes will be resolved automatically, without asking the navigator interface.
/// For child nodes that are not essential to resolving, the resolve visitor will switch back to scanning mode (and thus will
/// ask the navigator for further instructions).
///
/// Moreover, there is the <c>ResolveAll</c> mode - it works similar to resolving mode, but will not switch back to scanning mode.
/// The whole subtree will be resolved without notifying the navigator.
/// </remarks>
sealed class ResolveVisitor : IAstVisitor<ResolveResult>
{
// The ResolveVisitor is also responsible for handling lambda expressions.
static readonly ResolveResult errorResult = ErrorResolveResult.UnknownError;
CSharpResolver resolver;
/// <summary>Resolve result of the current LINQ query.</summary>
/// <remarks>We do not have to put this into the stored state (resolver) because
/// query expressions are always resolved in a single operation.</remarks>
ResolveResult currentQueryResult;
readonly CSharpUnresolvedFile unresolvedFile;
readonly Dictionary<AstNode, ResolveResult> resolveResultCache = new Dictionary<AstNode, ResolveResult>();
readonly Dictionary<AstNode, CSharpResolver> resolverBeforeDict = new Dictionary<AstNode, CSharpResolver>();
readonly Dictionary<AstNode, CSharpResolver> resolverAfterDict = new Dictionary<AstNode, CSharpResolver>();
readonly Dictionary<Expression, ConversionWithTargetType> conversionDict = new Dictionary<Expression, ConversionWithTargetType>();
internal struct ConversionWithTargetType
{
public readonly Conversion Conversion;
public readonly IType TargetType;
public ConversionWithTargetType(Conversion conversion, IType targetType)
{
this.Conversion = conversion;
this.TargetType = targetType;
}
}
IResolveVisitorNavigator navigator;
bool resolverEnabled;
List<LambdaBase> undecidedLambdas;
internal CancellationToken cancellationToken;
#region Constructor
static readonly IResolveVisitorNavigator skipAllNavigator = new ConstantModeResolveVisitorNavigator(ResolveVisitorNavigationMode.Skip, null);
/// <summary>
/// Creates a new ResolveVisitor instance.
/// </summary>
public ResolveVisitor(CSharpResolver resolver, CSharpUnresolvedFile unresolvedFile)
{
if (resolver == null)
throw new ArgumentNullException("resolver");
this.resolver = resolver;
this.unresolvedFile = unresolvedFile;
this.navigator = skipAllNavigator;
}
internal void SetNavigator(IResolveVisitorNavigator navigator)
{
this.navigator = navigator ?? skipAllNavigator;
}
ResolveResult voidResult {
get {
return new ResolveResult(resolver.Compilation.FindType(KnownTypeCode.Void));
}
}
#endregion
#region ResetContext
/// <summary>
/// Resets the visitor to the stored position, runs the action, and then reverts the visitor to the previous position.
/// </summary>
void ResetContext(CSharpResolver storedContext, Action action)
{
var oldResolverEnabled = this.resolverEnabled;
var oldResolver = this.resolver;
var oldQueryResult = this.currentQueryResult;
try {
this.resolverEnabled = false;
this.resolver = storedContext;
this.currentQueryResult = null;
action();
} finally {
this.resolverEnabled = oldResolverEnabled;
this.resolver = oldResolver;
this.currentQueryResult = oldQueryResult;
}
}
#endregion
#region Scan / Resolve
/// <summary>
/// Scans the AST rooted at the given node.
/// </summary>
public void Scan(AstNode node)
{
if (node == null || node.IsNull)
return;
switch (node.NodeType) {
case NodeType.Token:
case NodeType.Whitespace:
return; // skip tokens, identifiers, comments, etc.
}
// don't Scan again if the node was already resolved
if (resolveResultCache.ContainsKey(node)) {
// Restore state change caused by this node:
CSharpResolver newResolver;
if (resolverAfterDict.TryGetValue(node, out newResolver))
resolver = newResolver;
return;
}
var mode = navigator.Scan(node);
switch (mode) {
case ResolveVisitorNavigationMode.Skip:
if (node is VariableDeclarationStatement || node is SwitchSection) {
// Enforce scanning of variable declarations.
goto case ResolveVisitorNavigationMode.Scan;
}
StoreCurrentState(node);
break;
case ResolveVisitorNavigationMode.Scan:
bool oldResolverEnabled = resolverEnabled;
var oldResolver = resolver;
resolverEnabled = false;
StoreCurrentState(node);
ResolveResult result = node.AcceptVisitor(this);
if (result != null) {
// If the node was resolved, store the result even though it wasn't requested.
// This is necessary so that Visit-methods that decide to always resolve are
// guaranteed to get called only once.
// This is used for lambda registration.
StoreResult(node, result);
if (resolver != oldResolver) {
// The node changed the resolver state:
resolverAfterDict.Add(node, resolver);
}
cancellationToken.ThrowIfCancellationRequested();
}
resolverEnabled = oldResolverEnabled;
break;
case ResolveVisitorNavigationMode.Resolve:
Resolve(node);
break;
default:
throw new InvalidOperationException("Invalid value for ResolveVisitorNavigationMode");
}
}
/// <summary>
/// Equivalent to 'Scan', but also resolves the node at the same time.
/// This method should be only used if the CSharpResolver passed to the ResolveVisitor was manually set
/// to the correct state.
/// Otherwise, use <c>resolver.Scan(syntaxTree); var result = resolver.GetResolveResult(node);</c>
/// instead.
/// --
/// This method now is internal, because it is difficult to use correctly.
/// Users of the public API should use Scan()+GetResolveResult() instead.
/// </summary>
internal ResolveResult Resolve(AstNode node)
{
if (node == null || node.IsNull)
return errorResult;
bool oldResolverEnabled = resolverEnabled;
resolverEnabled = true;
ResolveResult result;
if (!resolveResultCache.TryGetValue(node, out result)) {
cancellationToken.ThrowIfCancellationRequested();
StoreCurrentState(node);
var oldResolver = resolver;
result = node.AcceptVisitor(this) ?? errorResult;
StoreResult(node, result);
if (resolver != oldResolver) {
// The node changed the resolver state:
resolverAfterDict.Add(node, resolver);
}
}
resolverEnabled = oldResolverEnabled;
return result;
}
IType ResolveType(AstType type)
{
return Resolve(type).Type;
}
void StoreCurrentState(AstNode node)
{
// It's possible that we re-visit an expression that we scanned over earlier,
// so we might have to overwrite an existing state.
#if DEBUG
CSharpResolver oldResolver;
if (resolverBeforeDict.TryGetValue(node, out oldResolver)) {
Debug.Assert(oldResolver.LocalVariables.SequenceEqual(resolver.LocalVariables));
}
#endif
resolverBeforeDict[node] = resolver;
}
void StoreResult(AstNode node, ResolveResult result)
{
Debug.Assert(result != null);
if (node.IsNull)
return;
Log.WriteLine("Resolved '{0}' to {1}", node, result);
Debug.Assert(!CSharpAstResolver.IsUnresolvableNode(node));
// The state should be stored before the result is.
Debug.Assert(resolverBeforeDict.ContainsKey(node));
// Don't store results twice.
Debug.Assert(!resolveResultCache.ContainsKey(node));
resolveResultCache[node] = result;
if (navigator != null)
navigator.Resolved(node, result);
}
void ScanChildren(AstNode node)
{
for (AstNode child = node.FirstChild; child != null; child = child.NextSibling) {
Scan(child);
}
}
#endregion
#region Process Conversions
sealed class AnonymousFunctionConversion : Conversion
{
public readonly IType ReturnType;
public readonly ExplicitlyTypedLambda ExplicitlyTypedLambda;
public readonly LambdaTypeHypothesis Hypothesis;
readonly bool isValid;
public AnonymousFunctionConversion(IType returnType, LambdaTypeHypothesis hypothesis, bool isValid)
{
if (returnType == null)
throw new ArgumentNullException("returnType");
this.ReturnType = returnType;
this.Hypothesis = hypothesis;
this.isValid = isValid;
}
public AnonymousFunctionConversion(IType returnType, ExplicitlyTypedLambda explicitlyTypedLambda, bool isValid)
{
if (returnType == null)
throw new ArgumentNullException("returnType");
this.ReturnType = returnType;
this.ExplicitlyTypedLambda = explicitlyTypedLambda;
this.isValid = isValid;
}
public override bool IsValid {
get { return isValid; }
}
public override bool IsImplicit {
get { return true; }
}
public override bool IsAnonymousFunctionConversion {
get { return true; }
}
}
/// <summary>
/// Convert 'rr' to the target type using the specified conversion.
/// </summary>
void ProcessConversion(Expression expr, ResolveResult rr, Conversion conversion, IType targetType)
{
AnonymousFunctionConversion afc = conversion as AnonymousFunctionConversion;
if (afc != null) {
Log.WriteLine("Processing conversion of anonymous function to " + targetType + "...");
Log.Indent();
if (afc.Hypothesis != null)
afc.Hypothesis.MergeInto(this, afc.ReturnType);
if (afc.ExplicitlyTypedLambda != null)
afc.ExplicitlyTypedLambda.ApplyReturnType(this, afc.ReturnType);
Log.Unindent();
}
if (expr != null && !expr.IsNull && conversion != Conversion.IdentityConversion) {
navigator.ProcessConversion(expr, rr, conversion, targetType);
conversionDict[expr] = new ConversionWithTargetType(conversion, targetType);
}
}
void ImportConversions(ResolveVisitor childVisitor)
{
foreach (var pair in childVisitor.conversionDict) {
conversionDict.Add(pair.Key, pair.Value);
navigator.ProcessConversion(pair.Key, resolveResultCache[pair.Key], pair.Value.Conversion, pair.Value.TargetType);
}
}
/// <summary>
/// Convert 'rr' to the target type.
/// </summary>
void ProcessConversion(Expression expr, ResolveResult rr, IType targetType)
{
if (expr == null || expr.IsNull)
return;
ProcessConversion(expr, rr, resolver.conversions.ImplicitConversion(rr, targetType), targetType);
}
/// <summary>
/// Resolves the specified expression and processes the conversion to targetType.
/// </summary>
void ResolveAndProcessConversion(Expression expr, IType targetType)
{
if (targetType.Kind == TypeKind.Unknown || targetType.Kind == TypeKind.Void) {
// no need to resolve the expression right now
Scan(expr);
} else {
ProcessConversion(expr, Resolve(expr), targetType);
}
}
void ProcessConversionResult(Expression expr, ConversionResolveResult rr)
{
if (rr != null)
ProcessConversion(expr, rr.Input, rr.Conversion, rr.Type);
}
void ProcessConversionResults(IEnumerable<Expression> expr, IEnumerable<ResolveResult> conversionResolveResults)
{
Debug.Assert(expr.Count() == conversionResolveResults.Count());
using (var e1 = expr.GetEnumerator()) {
using (var e2 = conversionResolveResults.GetEnumerator()) {
while (e1.MoveNext() && e2.MoveNext()) {
ProcessConversionResult(e1.Current, e2.Current as ConversionResolveResult);
}
}
}
}
void MarkUnknownNamedArguments(IEnumerable<Expression> arguments)
{
foreach (var nae in arguments.OfType<NamedArgumentExpression>()) {
StoreCurrentState(nae);
StoreResult(nae, new NamedArgumentResolveResult(nae.Name, resolveResultCache[nae.Expression]));
}
}
void ProcessInvocationResult(Expression target, IEnumerable<Expression> arguments, ResolveResult invocation)
{
if (invocation is CSharpInvocationResolveResult || invocation is DynamicInvocationResolveResult) {
int i = 0;
IList<ResolveResult> argumentsRR;
if (invocation is CSharpInvocationResolveResult) {
var csi = (CSharpInvocationResolveResult)invocation;
if (csi.IsExtensionMethodInvocation) {
Debug.Assert(arguments.Count() + 1 == csi.Arguments.Count);
ProcessConversionResult(target, csi.Arguments[0] as ConversionResolveResult);
i = 1;
} else {
Debug.Assert(arguments.Count() == csi.Arguments.Count);
}
argumentsRR = csi.Arguments;
}
else {
argumentsRR = ((DynamicInvocationResolveResult)invocation).Arguments;
}
foreach (Expression arg in arguments) {
ResolveResult argRR = argumentsRR[i++];
NamedArgumentExpression nae = arg as NamedArgumentExpression;
NamedArgumentResolveResult nrr = argRR as NamedArgumentResolveResult;
Debug.Assert((nae == null) == (nrr == null));
if (nae != null && nrr != null) {
StoreCurrentState(nae);
StoreResult(nae, nrr);
ProcessConversionResult(nae.Expression, nrr.Argument as ConversionResolveResult);
} else {
ProcessConversionResult(arg, argRR as ConversionResolveResult);
}
}
}
else {
MarkUnknownNamedArguments(arguments);
}
}
#endregion
#region GetResolveResult
/// <summary>
/// Gets the resolve result for the specified node.
/// If the node was not resolved by the navigator, this method will resolve it.
/// </summary>
public ResolveResult GetResolveResult(AstNode node)
{
Debug.Assert(!CSharpAstResolver.IsUnresolvableNode(node));
MergeUndecidedLambdas();
ResolveResult result;
if (resolveResultCache.TryGetValue(node, out result))
return result;
AstNode parent;
CSharpResolver storedResolver = GetPreviouslyScannedContext(node, out parent);
ResetContext(
storedResolver,
delegate {
navigator = new NodeListResolveVisitorNavigator(node);
Debug.Assert(!resolverEnabled);
Scan(parent);
navigator = skipAllNavigator;
});
MergeUndecidedLambdas();
return resolveResultCache[node];
}
CSharpResolver GetPreviouslyScannedContext(AstNode node, out AstNode parent)
{
parent = node;
CSharpResolver storedResolver;
while (!resolverBeforeDict.TryGetValue(parent, out storedResolver)) {
parent = parent.Parent;
if (parent == null)
throw new InvalidOperationException("Could not find a resolver state for any parent of the specified node. Are you trying to resolve a node that is not a descendant of the CSharpAstResolver's root node?");
}
return storedResolver;
}
/// <summary>
/// Gets the resolver state in front of the specified node.
/// If the node was not visited by a previous scanning process, the
/// AST will be scanned again to determine the state.
/// </summary>
public CSharpResolver GetResolverStateBefore(AstNode node)
{
MergeUndecidedLambdas();
CSharpResolver r;
if (resolverBeforeDict.TryGetValue(node, out r))
return r;
AstNode parent;
CSharpResolver storedResolver = GetPreviouslyScannedContext(node, out parent);
ResetContext(
storedResolver,
delegate {
navigator = new NodeListResolveVisitorNavigator(new[] { node }, scanOnly: true);
Debug.Assert(!resolverEnabled);
// parent might already be resolved if 'node' is an unresolvable node
Scan(parent);
navigator = skipAllNavigator;
});
MergeUndecidedLambdas();
while (node != null) {
if (resolverBeforeDict.TryGetValue(node, out r))
return r;
node = node.Parent;
}
return null;
}
public CSharpResolver GetResolverStateAfter(AstNode node)
{
// Resolve the node to fill the resolverAfterDict
GetResolveResult(node);
CSharpResolver result;
if (resolverAfterDict.TryGetValue(node, out result))
return result;
else
return GetResolverStateBefore(node);
}
public ConversionWithTargetType GetConversionWithTargetType(Expression expr)
{
GetResolverStateBefore(expr);
ResolveParentForConversion(expr);
ConversionWithTargetType result;
if (conversionDict.TryGetValue(expr, out result)) {
return result;
} else {
ResolveResult rr = GetResolveResult(expr);
return new ConversionWithTargetType(Conversion.IdentityConversion, rr.Type);
}
}
#endregion
#region Track UsingScope
ResolveResult IAstVisitor<ResolveResult>.VisitSyntaxTree(SyntaxTree unit)
{
CSharpResolver previousResolver = resolver;
try {
if (unresolvedFile != null) {
resolver = resolver.WithCurrentUsingScope(unresolvedFile.RootUsingScope.Resolve(resolver.Compilation));
} else {
var cv = new TypeSystemConvertVisitor(unit.FileName ?? string.Empty);
ApplyVisitorToUsings(cv, unit.Children);
PushUsingScope(cv.UnresolvedFile.RootUsingScope);
}
ScanChildren(unit);
return voidResult;
} finally {
resolver = previousResolver;
}
}
void ApplyVisitorToUsings(TypeSystemConvertVisitor visitor, IEnumerable<AstNode> children)
{
foreach (var child in children) {
if (child is ExternAliasDeclaration || child is UsingDeclaration || child is UsingAliasDeclaration) {
child.AcceptVisitor(visitor);
}
}
}
void PushUsingScope(UsingScope usingScope)
{
usingScope.Freeze();
resolver = resolver.WithCurrentUsingScope(new ResolvedUsingScope(resolver.CurrentTypeResolveContext, usingScope));
}
ResolveResult IAstVisitor<ResolveResult>.VisitNamespaceDeclaration(NamespaceDeclaration namespaceDeclaration)
{
CSharpResolver previousResolver = resolver;
try {
if (unresolvedFile != null) {
resolver = resolver.WithCurrentUsingScope(unresolvedFile.GetUsingScope(namespaceDeclaration.StartLocation).Resolve(resolver.Compilation));
} else {
// string fileName = namespaceDeclaration.GetRegion().FileName ?? string.Empty;
// Fetch parent using scope
// Create root using scope if necessary
if (resolver.CurrentUsingScope == null)
PushUsingScope(new UsingScope());
// Create child using scope
DomRegion region = namespaceDeclaration.GetRegion();
var identifiers = namespaceDeclaration.Identifiers.ToList();
// For all but the last identifier:
UsingScope usingScope;
for (int i = 0; i < identifiers.Count - 1; i++) {
usingScope = new UsingScope(resolver.CurrentUsingScope.UnresolvedUsingScope, identifiers[i].Name);
usingScope.Region = region;
PushUsingScope(usingScope);
}
// Last using scope:
usingScope = new UsingScope(resolver.CurrentUsingScope.UnresolvedUsingScope, identifiers.Last().Name);
usingScope.Region = region;
var cv = new TypeSystemConvertVisitor(new CSharpUnresolvedFile(region.FileName ?? string.Empty), usingScope);
ApplyVisitorToUsings(cv, namespaceDeclaration.Children);
PushUsingScope(usingScope);
}
ScanChildren(namespaceDeclaration);
// merge undecided lambdas before leaving the using scope so that
// the resolver can make better use of its cache
MergeUndecidedLambdas();
if (resolver.CurrentUsingScope != null && resolver.CurrentUsingScope.Namespace != null)
return new NamespaceResolveResult(resolver.CurrentUsingScope.Namespace);
else
return null;
} finally {
resolver = previousResolver;
}
}
#endregion
#region Track CurrentTypeDefinition
ResolveResult VisitTypeOrDelegate(AstNode typeDeclaration, string name, int typeParameterCount)
{
CSharpResolver previousResolver = resolver;
try {
ITypeDefinition newTypeDefinition = null;
if (resolver.CurrentTypeDefinition != null) {
int totalTypeParameterCount = resolver.CurrentTypeDefinition.TypeParameterCount + typeParameterCount;
foreach (ITypeDefinition nestedType in resolver.CurrentTypeDefinition.NestedTypes) {
if (nestedType.Name == name && nestedType.TypeParameterCount == totalTypeParameterCount) {
newTypeDefinition = nestedType;
break;
}
}
} else if (resolver.CurrentUsingScope != null) {
newTypeDefinition = resolver.CurrentUsingScope.Namespace.GetTypeDefinition(name, typeParameterCount);
}
if (newTypeDefinition != null)
resolver = resolver.WithCurrentTypeDefinition(newTypeDefinition);
ScanChildren(typeDeclaration);
// merge undecided lambdas before leaving the type definition so that
// the resolver can make better use of its cache
MergeUndecidedLambdas();
return newTypeDefinition != null ? new TypeResolveResult(newTypeDefinition) : errorResult;
} finally {
resolver = previousResolver;
}
}
ResolveResult IAstVisitor<ResolveResult>.VisitTypeDeclaration(TypeDeclaration typeDeclaration)
{
return VisitTypeOrDelegate(typeDeclaration, typeDeclaration.Name, typeDeclaration.TypeParameters.Count);
}
ResolveResult IAstVisitor<ResolveResult>.VisitDelegateDeclaration(DelegateDeclaration delegateDeclaration)
{
return VisitTypeOrDelegate(delegateDeclaration, delegateDeclaration.Name, delegateDeclaration.TypeParameters.Count);
}
#endregion
#region Track CurrentMember
ResolveResult IAstVisitor<ResolveResult>.VisitFieldDeclaration(FieldDeclaration fieldDeclaration)
{
return VisitFieldOrEventDeclaration(fieldDeclaration, EntityType.Field);
}
ResolveResult IAstVisitor<ResolveResult>.VisitFixedFieldDeclaration(FixedFieldDeclaration fixedFieldDeclaration)
{
return VisitFieldOrEventDeclaration(fixedFieldDeclaration, EntityType.Field);
}
ResolveResult IAstVisitor<ResolveResult>.VisitEventDeclaration(EventDeclaration eventDeclaration)
{
return VisitFieldOrEventDeclaration(eventDeclaration, EntityType.Event);
}
ResolveResult VisitFieldOrEventDeclaration(EntityDeclaration fieldOrEventDeclaration, EntityType entityType)
{
//int initializerCount = fieldOrEventDeclaration.GetChildrenByRole(Roles.Variable).Count;
CSharpResolver oldResolver = resolver;
for (AstNode node = fieldOrEventDeclaration.FirstChild; node != null; node = node.NextSibling) {
if (node.Role == Roles.Variable) {
IMember member;
if (unresolvedFile != null) {
member = GetMemberFromLocation(node);
} else {
string name = ((VariableInitializer)node).Name;
member = AbstractUnresolvedMember.Resolve(resolver.CurrentTypeResolveContext, entityType, name);
}
resolver = resolver.WithCurrentMember(member);
Scan(node);
resolver = oldResolver;
} else {
Scan(node);
}
}
return voidResult;
}
IMember GetMemberFromLocation(AstNode node)
{
ITypeDefinition typeDef = resolver.CurrentTypeDefinition;
if (typeDef == null)
return null;
TextLocation location = TypeSystemConvertVisitor.GetStartLocationAfterAttributes(node);
return typeDef.GetMembers(
delegate (IUnresolvedMember m) {
if (m.UnresolvedFile != unresolvedFile)
return false;
DomRegion region = m.Region;
return !region.IsEmpty && region.Begin <= location && region.End > location;
},
GetMemberOptions.IgnoreInheritedMembers | GetMemberOptions.ReturnMemberDefinitions
).FirstOrDefault();
}
ResolveResult IAstVisitor<ResolveResult>.VisitVariableInitializer(VariableInitializer variableInitializer)
{
// Within the variable initializer, the newly declared variable is not yet available:
var resolverWithVariable = resolver;
if (variableInitializer.Parent is VariableDeclarationStatement)
resolver = resolver.PopLastVariable();
ArrayInitializerExpression aie = variableInitializer.Initializer as ArrayInitializerExpression;
if (resolverEnabled || aie != null) {
ResolveResult result = errorResult;
if (variableInitializer.Parent is FieldDeclaration || variableInitializer.Parent is EventDeclaration) {
if (resolver.CurrentMember != null) {
result = new MemberResolveResult(null, resolver.CurrentMember, false);
}
} else {
string identifier = variableInitializer.Name;
foreach (IVariable v in resolverWithVariable.LocalVariables) {
if (v.Name == identifier) {
result = new LocalResolveResult(v);
break;
}
}
}
ArrayType arrayType = result.Type as ArrayType;
if (aie != null && arrayType != null) {
StoreCurrentState(aie);
List<Expression> initializerElements = new List<Expression>();
int[] sizes = new int[arrayType.Dimensions];
UnpackArrayInitializer(initializerElements, sizes, aie, 0, true);
ResolveResult[] initializerElementResults = new ResolveResult[initializerElements.Count];
for (int i = 0; i < initializerElementResults.Length; i++) {
initializerElementResults[i] = Resolve(initializerElements[i]);
}
var arrayCreation = resolver.ResolveArrayCreation(arrayType.ElementType, sizes, initializerElementResults);
StoreResult(aie, arrayCreation);
ProcessConversionResults(initializerElements, arrayCreation.InitializerElements);
} else if (variableInitializer.Parent is FixedStatement) {
var initRR = Resolve(variableInitializer.Initializer);
PointerType pointerType;
if (initRR.Type.Kind == TypeKind.Array) {
pointerType = new PointerType(((ArrayType)initRR.Type).ElementType);
} else if (ReflectionHelper.GetTypeCode(initRR.Type) == TypeCode.String) {
pointerType = new PointerType(resolver.Compilation.FindType(KnownTypeCode.Char));
} else {
pointerType = null;
ProcessConversion(variableInitializer.Initializer, initRR, result.Type);
}
if (pointerType != null) {
var conversion = resolver.conversions.ImplicitConversion(pointerType, result.Type);
if (conversion.IsIdentityConversion)
conversion = Conversion.ImplicitPointerConversion;
ProcessConversion(variableInitializer.Initializer, initRR, conversion, result.Type);
}
} else {
ResolveAndProcessConversion(variableInitializer.Initializer, result.Type);
}
resolver = resolverWithVariable;
return result;
} else {
Scan(variableInitializer.Initializer);
resolver = resolverWithVariable;
return null;
}
}
ResolveResult IAstVisitor<ResolveResult>.VisitFixedVariableInitializer(FixedVariableInitializer fixedVariableInitializer)
{
if (resolverEnabled) {
ResolveResult result = errorResult;
if (resolver.CurrentMember != null) {
result = new MemberResolveResult(null, resolver.CurrentMember, false);
}
ResolveAndProcessConversion(fixedVariableInitializer.CountExpression, resolver.Compilation.FindType(KnownTypeCode.Int32));
return result;
} else {
ScanChildren(fixedVariableInitializer);
return null;
}
}
ResolveResult VisitMethodMember(EntityDeclaration memberDeclaration)
{
CSharpResolver oldResolver = resolver;
try {
IMember member;
if (unresolvedFile != null) {
member = GetMemberFromLocation(memberDeclaration);
} else {
// Re-discover the method:
EntityType entityType = memberDeclaration.EntityType;
var parameterTypes = TypeSystemConvertVisitor.GetParameterTypes(memberDeclaration.GetChildrenByRole(Roles.Parameter), InterningProvider.Dummy);
if (entityType == EntityType.Constructor) {
string name = memberDeclaration.HasModifier(Modifiers.Static) ? ".cctor" : ".ctor";
member = AbstractUnresolvedMember.Resolve(
resolver.CurrentTypeResolveContext, entityType, name,
parameterTypeReferences: parameterTypes);
} else if (entityType == EntityType.Destructor) {
member = AbstractUnresolvedMember.Resolve(resolver.CurrentTypeResolveContext, entityType, "Finalize");
} else {
string[] typeParameterNames = memberDeclaration.GetChildrenByRole(Roles.TypeParameter).Select(tp => tp.Name).ToArray();
AstType explicitInterfaceAstType = memberDeclaration.GetChildByRole(EntityDeclaration.PrivateImplementationTypeRole);
ITypeReference explicitInterfaceType = null;
if (!explicitInterfaceAstType.IsNull) {
explicitInterfaceType = explicitInterfaceAstType.ToTypeReference();
}
member = AbstractUnresolvedMember.Resolve(
resolver.CurrentTypeResolveContext, entityType, memberDeclaration.Name,
explicitInterfaceType, typeParameterNames, parameterTypes);
}
}
resolver = resolver.WithCurrentMember(member);
ScanChildren(memberDeclaration);
if (member != null)
return new MemberResolveResult(null, member, false);
else
return errorResult;
} finally {
resolver = oldResolver;
}
}
ResolveResult IAstVisitor<ResolveResult>.VisitMethodDeclaration(MethodDeclaration methodDeclaration)
{
return VisitMethodMember(methodDeclaration);
}
ResolveResult IAstVisitor<ResolveResult>.VisitOperatorDeclaration(OperatorDeclaration operatorDeclaration)
{
return VisitMethodMember(operatorDeclaration);
}
ResolveResult IAstVisitor<ResolveResult>.VisitConstructorDeclaration(ConstructorDeclaration constructorDeclaration)
{
return VisitMethodMember(constructorDeclaration);
}
ResolveResult IAstVisitor<ResolveResult>.VisitDestructorDeclaration(DestructorDeclaration destructorDeclaration)
{
return VisitMethodMember(destructorDeclaration);
}
// handle properties/indexers
ResolveResult VisitPropertyMember(EntityDeclaration propertyOrIndexerDeclaration)
{
CSharpResolver oldResolver = resolver;
try {
IMember member;
if (unresolvedFile != null) {
member = GetMemberFromLocation(propertyOrIndexerDeclaration);
} else {
// Re-discover the property:
string name = propertyOrIndexerDeclaration.Name;
var parameterTypeReferences = TypeSystemConvertVisitor.GetParameterTypes(propertyOrIndexerDeclaration.GetChildrenByRole(Roles.Parameter), InterningProvider.Dummy);
AstType explicitInterfaceAstType = propertyOrIndexerDeclaration.GetChildByRole(EntityDeclaration.PrivateImplementationTypeRole);
ITypeReference explicitInterfaceType = null;
if (!explicitInterfaceAstType.IsNull) {
explicitInterfaceType = explicitInterfaceAstType.ToTypeReference();
}
member = AbstractUnresolvedMember.Resolve(
resolver.CurrentTypeResolveContext, propertyOrIndexerDeclaration.EntityType, name,
explicitInterfaceType, parameterTypeReferences: parameterTypeReferences);
}
// We need to use the property as current member so that indexer parameters can be resolved correctly.
resolver = resolver.WithCurrentMember(member);
var resolverWithPropertyAsMember = resolver;
for (AstNode node = propertyOrIndexerDeclaration.FirstChild; node != null; node = node.NextSibling) {
if (node.Role == PropertyDeclaration.GetterRole && member is IProperty) {
resolver = resolver.WithCurrentMember(((IProperty)member).Getter);
Scan(node);
resolver = resolverWithPropertyAsMember;
} else if (node.Role == PropertyDeclaration.SetterRole && member is IProperty) {
resolver = resolver.WithCurrentMember(((IProperty)member).Setter);
Scan(node);
resolver = resolverWithPropertyAsMember;
} else {
Scan(node);
}
}
if (member != null)
return new MemberResolveResult(null, member, false);
else
return errorResult;
} finally {
resolver = oldResolver;
}
}
ResolveResult IAstVisitor<ResolveResult>.VisitPropertyDeclaration(PropertyDeclaration propertyDeclaration)
{
return VisitPropertyMember(propertyDeclaration);
}
ResolveResult IAstVisitor<ResolveResult>.VisitIndexerDeclaration(IndexerDeclaration indexerDeclaration)
{
return VisitPropertyMember(indexerDeclaration);
}
ResolveResult IAstVisitor<ResolveResult>.VisitCustomEventDeclaration(CustomEventDeclaration eventDeclaration)
{
CSharpResolver oldResolver = resolver;
try {
IMember member;
if (unresolvedFile != null) {
member = GetMemberFromLocation(eventDeclaration);
} else {
string name = eventDeclaration.Name;
AstType explicitInterfaceAstType = eventDeclaration.PrivateImplementationType;
if (explicitInterfaceAstType.IsNull) {
member = AbstractUnresolvedMember.Resolve(resolver.CurrentTypeResolveContext, EntityType.Event, name);
} else {
member = AbstractUnresolvedMember.Resolve(resolver.CurrentTypeResolveContext, EntityType.Event, name,
explicitInterfaceAstType.ToTypeReference());
}
}
resolver = resolver.WithCurrentMember(member);
var resolverWithEventAsMember = resolver;
for (AstNode node = eventDeclaration.FirstChild; node != null; node = node.NextSibling) {
if (node.Role == CustomEventDeclaration.AddAccessorRole && member is IEvent) {
resolver = resolver.WithCurrentMember(((IEvent)member).AddAccessor);
Scan(node);
resolver = resolverWithEventAsMember;
} else if (node.Role == CustomEventDeclaration.RemoveAccessorRole && member is IEvent) {
resolver = resolver.WithCurrentMember(((IEvent)member).RemoveAccessor);
Scan(node);
resolver = resolverWithEventAsMember;
} else {
Scan(node);
}
}
if (member != null)
return new MemberResolveResult(null, member, false);
else
return errorResult;
} finally {
resolver = oldResolver;
}
}
ResolveResult IAstVisitor<ResolveResult>.VisitParameterDeclaration(ParameterDeclaration parameterDeclaration)
{
ScanChildren(parameterDeclaration);
if (resolverEnabled) {
string name = parameterDeclaration.Name;
if (parameterDeclaration.Parent is DocumentationReference) {
// create a dummy parameter
IType type = ResolveType(parameterDeclaration.Type);
switch (parameterDeclaration.ParameterModifier) {
case ParameterModifier.Ref:
case ParameterModifier.Out:
type = new ByReferenceType(type);
break;
}
return new LocalResolveResult(new DefaultParameter(
type, name,
isRef: parameterDeclaration.ParameterModifier == ParameterModifier.Ref,
isOut: parameterDeclaration.ParameterModifier == ParameterModifier.Out,
isParams: parameterDeclaration.ParameterModifier == ParameterModifier.Params));
}
// Look in lambda parameters:
foreach (IParameter p in resolver.LocalVariables.OfType<IParameter>()) {
if (p.Name == name)
return new LocalResolveResult(p);
}
IParameterizedMember pm = resolver.CurrentMember as IParameterizedMember;
if (pm == null && resolver.CurrentTypeDefinition != null) {
// Also consider delegate parameters:
pm = resolver.CurrentTypeDefinition.GetDelegateInvokeMethod();
// pm will be null if the current type isn't a delegate
}
if (pm != null) {
foreach (IParameter p in pm.Parameters) {
if (p.Name == name) {
return new LocalResolveResult(p);
}
}
}
return errorResult;
} else {
return null;
}
}