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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.LanguageService;
using Microsoft.CodeAnalysis.Shared.Extensions;
namespace Microsoft.CodeAnalysis.FindSymbols.Finders;
internal sealed class ConstructorSymbolReferenceFinder : AbstractReferenceFinder<IMethodSymbol>
{
public static readonly ConstructorSymbolReferenceFinder Instance = new();
private ConstructorSymbolReferenceFinder()
{
}
protected override bool CanFind(IMethodSymbol symbol)
=> symbol.MethodKind is MethodKind.Constructor or MethodKind.StaticConstructor;
protected override Task<ImmutableArray<string>> DetermineGlobalAliasesAsync(IMethodSymbol symbol, Project project, CancellationToken cancellationToken)
{
var containingType = symbol.ContainingType;
return GetAllMatchingGlobalAliasNamesAsync(project, containingType.Name, containingType.Arity, cancellationToken);
}
protected override async Task DetermineDocumentsToSearchAsync<TData>(
IMethodSymbol symbol,
HashSet<string>? globalAliases,
Project project,
IImmutableSet<Document>? documents,
Action<Document, TData> processResult,
TData processResultData,
FindReferencesSearchOptions options,
CancellationToken cancellationToken)
{
var containingType = symbol.ContainingType;
var typeName = symbol.ContainingType.Name;
await AddDocumentsAsync(
project, documents, typeName, processResult, processResultData, cancellationToken).ConfigureAwait(false);
if (globalAliases != null)
{
foreach (var globalAlias in globalAliases)
{
await AddDocumentsAsync(
project, documents, globalAlias, processResult, processResultData, cancellationToken).ConfigureAwait(false);
}
}
await FindDocumentsAsync(
project, documents, containingType.SpecialType.ToPredefinedType(), processResult, processResultData, cancellationToken).ConfigureAwait(false);
await FindDocumentsWithGlobalSuppressMessageAttributeAsync(
project, documents, processResult, processResultData, cancellationToken).ConfigureAwait(false);
if (symbol.MethodKind == MethodKind.Constructor)
{
await FindDocumentsWithImplicitObjectCreationExpressionAsync(
project, documents, processResult, processResultData, cancellationToken).ConfigureAwait(false);
}
}
private static Task FindDocumentsWithImplicitObjectCreationExpressionAsync<TData>(Project project, IImmutableSet<Document>? documents, Action<Document, TData> processResult, TData processResultData, CancellationToken cancellationToken)
=> FindDocumentsWithPredicateAsync(project, documents, static index => index.ContainsImplicitObjectCreation, processResult, processResultData, cancellationToken);
private static async Task AddDocumentsAsync<TData>(
Project project,
IImmutableSet<Document>? documents,
string typeName,
Action<Document, TData> processResult,
TData processResultData,
CancellationToken cancellationToken)
{
await FindDocumentsAsync(project, documents, processResult, processResultData, cancellationToken, typeName).ConfigureAwait(false);
if (TryGetNameWithoutAttributeSuffix(typeName, project.Services.GetRequiredService<ISyntaxFactsService>(), out var simpleName))
await FindDocumentsAsync(project, documents, processResult, processResultData, cancellationToken, simpleName).ConfigureAwait(false);
}
private static bool IsPotentialReference(PredefinedType predefinedType, ISyntaxFactsService syntaxFacts, SyntaxToken token)
=> syntaxFacts.TryGetPredefinedType(token, out var actualType) &&
predefinedType == actualType;
protected override void FindReferencesInDocument<TData>(
IMethodSymbol methodSymbol,
FindReferencesDocumentState state,
Action<FinderLocation, TData> processResult,
TData processResultData,
FindReferencesSearchOptions options,
CancellationToken cancellationToken)
{
// First just look for this normal constructor references using the name of it's containing type.
var containingType = methodSymbol.ContainingType;
var containingTypeName = containingType.Name;
AddReferencesInDocumentWorker(
methodSymbol, containingTypeName, state, processResult, processResultData, cancellationToken);
// Next, look for constructor references through a global alias to our containing type.
foreach (var globalAlias in state.GlobalAliases)
FindReferenceToAlias(methodSymbol, state, processResult, processResultData, containingTypeName, globalAlias, cancellationToken);
foreach (var localAlias in state.Cache.SyntaxTreeIndex.GetAliases(containingTypeName, containingType.Arity))
FindReferenceToAlias(methodSymbol, state, processResult, processResultData, containingTypeName, localAlias, cancellationToken);
// Finally, look for constructor references to predefined types (like `new int()`),
// implicit object references, and inside global suppression attributes.
FindPredefinedTypeReferences(
methodSymbol, state, processResult, processResultData, cancellationToken);
FindReferencesInImplicitObjectCreationExpression(
methodSymbol, state, processResult, processResultData, cancellationToken);
FindReferencesInDocumentInsideGlobalSuppressions(
methodSymbol, state, processResult, processResultData, cancellationToken);
}
private static void FindReferenceToAlias<TData>(
IMethodSymbol methodSymbol, FindReferencesDocumentState state, Action<FinderLocation, TData> processResult, TData processResultData, string name, string alias, CancellationToken cancellationToken)
{
// ignore the cases where the global alias might match the type name (i.e.
// global alias Console = System.Console). We'll already find those references
// above.
if (state.SyntaxFacts.StringComparer.Equals(name, alias))
return;
AddReferencesInDocumentWorker(
methodSymbol, alias, state, processResult, processResultData, cancellationToken);
}
/// <summary>
/// Finds references to <paramref name="symbol"/> in this <paramref name="state"/>, but only if it referenced
/// though <paramref name="name"/> (which might be the actual name of the type, or a global alias to it).
/// </summary>
private static void AddReferencesInDocumentWorker<TData>(
IMethodSymbol symbol,
string name,
FindReferencesDocumentState state,
Action<FinderLocation, TData> processResult,
TData processResultData,
CancellationToken cancellationToken)
{
FindOrdinaryReferences(
symbol, name, state, processResult, processResultData, cancellationToken);
FindAttributeReferences(
symbol, name, state, processResult, processResultData, cancellationToken);
}
private static void FindOrdinaryReferences<TData>(
IMethodSymbol symbol,
string name,
FindReferencesDocumentState state,
Action<FinderLocation, TData> processResult,
TData processResultData,
CancellationToken cancellationToken)
{
FindReferencesInDocumentUsingIdentifier(
symbol, name, state, processResult, processResultData, cancellationToken);
}
private static void FindPredefinedTypeReferences<TData>(
IMethodSymbol symbol,
FindReferencesDocumentState state,
Action<FinderLocation, TData> processResult,
TData processResultData,
CancellationToken cancellationToken)
{
var predefinedType = symbol.ContainingType.SpecialType.ToPredefinedType();
if (predefinedType == PredefinedType.None)
return;
var tokens = state.Root
.DescendantTokens(descendIntoTrivia: true)
.WhereAsArray(
static (token, tuple) => IsPotentialReference(tuple.predefinedType, tuple.state.SyntaxFacts, token),
(state, predefinedType));
FindReferencesInTokens(symbol, state, tokens, processResult, processResultData, cancellationToken);
}
private static void FindAttributeReferences<TData>(
IMethodSymbol symbol,
string name,
FindReferencesDocumentState state,
Action<FinderLocation, TData> processResult,
TData processResultData,
CancellationToken cancellationToken)
{
if (TryGetNameWithoutAttributeSuffix(name, state.SyntaxFacts, out var simpleName))
FindReferencesInDocumentUsingIdentifier(symbol, simpleName, state, processResult, processResultData, cancellationToken);
}
private static void FindReferencesInImplicitObjectCreationExpression<TData>(
IMethodSymbol symbol,
FindReferencesDocumentState state,
Action<FinderLocation, TData> processResult,
TData processResultData,
CancellationToken cancellationToken)
{
if (!state.Cache.SyntaxTreeIndex.ContainsImplicitObjectCreation)
return;
// Note: only C# supports implicit object creation. So we don't need to do anything special around case
// insensitive matching here.
//
// Search for all the `new` tokens in the file.
var newKeywordTokens = state.Cache.GetNewKeywordTokens(cancellationToken);
if (newKeywordTokens.IsEmpty)
return;
// Only check `new (...)` calls that supply enough arguments to match all the required parameters for the constructor.
var minimumArgumentCount = symbol.Parameters.Count(static p => !p.IsOptional && !p.IsParams);
var maximumArgumentCount = symbol.Parameters is [.., { IsParams: true }]
? int.MaxValue
: symbol.Parameters.Length;
var exactArgumentCount = symbol.Parameters.Any(static p => p.IsOptional || p.IsParams)
? -1
: symbol.Parameters.Length;
var implicitObjectKind = state.SyntaxFacts.SyntaxKinds.ImplicitObjectCreationExpression;
foreach (var newKeywordToken in newKeywordTokens)
{
cancellationToken.ThrowIfCancellationRequested();
var node = newKeywordToken.Parent;
if (node is null || node.RawKind != implicitObjectKind)
continue;
// if there are too few or too many arguments, then don't bother checking.
var actualArgumentCount = state.SyntaxFacts.GetArgumentsOfObjectCreationExpression(node).Count;
if (actualArgumentCount < minimumArgumentCount || actualArgumentCount > maximumArgumentCount)
continue;
// if we need an exact count then make sure that the count we have fits the count we need.
if (exactArgumentCount != -1 && exactArgumentCount != actualArgumentCount)
continue;
var constructor = state.SemanticModel.GetSymbolInfo(node, cancellationToken).Symbol;
if (Matches(constructor, symbol))
{
var result = new FinderLocation(node, new ReferenceLocation(
state.Document,
alias: null,
newKeywordToken.GetLocation(),
isImplicit: true,
GetSymbolUsageInfo(node, state, cancellationToken),
GetAdditionalFindUsagesProperties(node, state), CandidateReason.None));
processResult(result, processResultData);
}
}
}
}
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