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Merged
michaelnebel merged 12 commits into from
Feb 3, 2025
Merged

C# 13: Partial properties and indexers. #18533

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963e658
C#: Add partial properties and indexers examples.
michaelnebel Jan 20, 2025
ff7719f
C#: Updated expected test output.
michaelnebel Jan 20, 2025
b3e56e6
C#: Add dispatch examples for partial properties and indexers.
michaelnebel Jan 21, 2025
e53c750
C#: Update expected output for dispatch tests.
michaelnebel Jan 21, 2025
dae5ca8
C#: Add dataflow examples for partial properties.
michaelnebel Jan 22, 2025
5836c8d
C#: Update expected test output for data flow tests.
michaelnebel Jan 22, 2025
568fd9c
C#: Add some partial tests for Properties and Indexers.
michaelnebel Jan 20, 2025
c481e82
C#: Add indexer data flow test.
michaelnebel Jan 22, 2025
443a2a4
C#: Add indexer data flow test expected output file.
michaelnebel Jan 22, 2025
0453ae8
C#: Use property- and indexer implementation location and extract the…
michaelnebel Jan 20, 2025
fc03c36
C#: Update expected test output.
michaelnebel Jan 20, 2025
501f985
C#: Add change note.
michaelnebel Jan 22, 2025
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4 changes: 4 additions & 0 deletions csharp/extractor/Semmle.Extraction.CSharp/Entities/Accessor.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,10 @@ protected Accessor(Context cx, IMethodSymbol init, IPropertySymbol property)
return props.SingleOrDefault();
}

public override bool NeedsPopulation =>
base.NeedsPopulation &&
!Symbol.IsPartialDefinition; // Accessors always have an implementing declaration as well.

public override void Populate(TextWriter trapFile)
{
PopulateMethod(trapFile);
Expand Down
8 changes: 4 additions & 4 deletions csharp/extractor/Semmle.Extraction.CSharp/Entities/Indexer.cs
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Expand Up @@ -22,16 +22,16 @@ public override void Populate(TextWriter trapFile)
foreach (var l in Locations)
trapFile.indexer_location(this, l);

var getter = Symbol.GetMethod;
var setter = Symbol.SetMethod;
var getter = BodyDeclaringSymbol.GetMethod;
var setter = BodyDeclaringSymbol.SetMethod;

if (getter is null && setter is null)
Context.ModelError(Symbol, "No indexer accessor defined");

if (!(getter is null))
if (getter is not null)
Method.Create(Context, getter);

if (!(setter is null))
if (setter is not null)
Method.Create(Context, setter);

for (var i = 0; i < Symbol.Parameters.Length; ++i)
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12 changes: 8 additions & 4 deletions csharp/extractor/Semmle.Extraction.CSharp/Entities/Property.cs
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Expand Up @@ -21,6 +21,10 @@ protected Property(Context cx, IPropertySymbol init)

private Type Type => type.Value;

protected override IPropertySymbol BodyDeclaringSymbol => Symbol.PartialImplementationPart ?? Symbol;

public override Microsoft.CodeAnalysis.Location? ReportingLocation => BodyDeclaringSymbol.Locations.BestOrDefault();

public override void WriteId(EscapingTextWriter trapFile)
{
trapFile.WriteSubId(Type);
Expand All @@ -43,13 +47,13 @@ public override void Populate(TextWriter trapFile)
var type = Type;
trapFile.properties(this, Symbol.GetName(), ContainingType!, type.TypeRef, Create(Context, Symbol.OriginalDefinition));

var getter = Symbol.GetMethod;
var setter = Symbol.SetMethod;
var getter = BodyDeclaringSymbol.GetMethod;
var setter = BodyDeclaringSymbol.SetMethod;

if (!(getter is null))
if (getter is not null)
Method.Create(Context, getter);

if (!(setter is null))
if (setter is not null)
Method.Create(Context, setter);

var declSyntaxReferences = IsSourceDeclaration ?
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4 changes: 4 additions & 0 deletions csharp/ql/lib/change-notes/2025-01-22-partial-members.md
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@@ -0,0 +1,4 @@
---
category: minorAnalysis
---
* C# 13: Added support for partial properties and indexers.
38 changes: 38 additions & 0 deletions csharp/ql/test/library-tests/dataflow/fields/D.cs
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Expand Up @@ -51,3 +51,41 @@ public static void Sink(object o) { }

static T Source<T>(object source) => throw null;
}

public partial class DPartial
{
private object _backingField;
public partial object PartialProp1
{
get { return _backingField; }
set { _backingField = value; }
}

public partial object PartialProp2
{
get { return null; }
set { }
}
}

public partial class DPartial
{
public partial object PartialProp1 { get; set; }
public partial object PartialProp2 { get; set; }

public void M()
{
var o = Source<object>(1);

var d = new DPartial();
d.PartialProp1 = o;
d.PartialProp2 = o;

Sink(d.PartialProp1); // $ hasValueFlow=1
Sink(d.PartialProp2); // no flow
}

public static void Sink(object o) { }

static T Source<T>(object source) => throw null;
}
56 changes: 56 additions & 0 deletions csharp/ql/test/library-tests/dataflow/fields/FieldFlow.expected
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Original file line number Diff line number Diff line change
Expand Up @@ -502,6 +502,30 @@ edges
| D.cs:47:14:47:14 | access to local variable d : D [field trivialPropField] : Object | D.cs:14:9:14:11 | this : D [field trivialPropField] : Object | provenance | |
| D.cs:47:14:47:14 | access to local variable d : D [field trivialPropField] : Object | D.cs:47:14:47:26 | access to property ComplexProp | provenance | |
| D.cs:47:14:47:14 | access to local variable d : D [field trivialPropField] : Object | D.cs:47:14:47:26 | access to property ComplexProp | provenance | |
| D.cs:60:9:60:11 | this : DPartial [field _backingField] : Object | D.cs:60:22:60:34 | this access : DPartial [field _backingField] : Object | provenance | |
| D.cs:60:9:60:11 | this : DPartial [field _backingField] : Object | D.cs:60:22:60:34 | this access : DPartial [field _backingField] : Object | provenance | |
| D.cs:60:22:60:34 | this access : DPartial [field _backingField] : Object | D.cs:60:22:60:34 | access to field _backingField : Object | provenance | |
| D.cs:60:22:60:34 | this access : DPartial [field _backingField] : Object | D.cs:60:22:60:34 | access to field _backingField : Object | provenance | |
| D.cs:61:9:61:11 | value : Object | D.cs:61:31:61:35 | access to parameter value : Object | provenance | |
| D.cs:61:9:61:11 | value : Object | D.cs:61:31:61:35 | access to parameter value : Object | provenance | |
| D.cs:61:15:61:27 | [post] this access : DPartial [field _backingField] : Object | D.cs:61:9:61:11 | this [Return] : DPartial [field _backingField] : Object | provenance | |
| D.cs:61:15:61:27 | [post] this access : DPartial [field _backingField] : Object | D.cs:61:9:61:11 | this [Return] : DPartial [field _backingField] : Object | provenance | |
| D.cs:61:31:61:35 | access to parameter value : Object | D.cs:61:15:61:27 | [post] this access : DPartial [field _backingField] : Object | provenance | |
| D.cs:61:31:61:35 | access to parameter value : Object | D.cs:61:15:61:27 | [post] this access : DPartial [field _backingField] : Object | provenance | |
| D.cs:78:13:78:13 | access to local variable o : Object | D.cs:81:26:81:26 | access to local variable o : Object | provenance | |
| D.cs:78:13:78:13 | access to local variable o : Object | D.cs:81:26:81:26 | access to local variable o : Object | provenance | |
| D.cs:78:17:78:33 | call to method Source<Object> : Object | D.cs:78:13:78:13 | access to local variable o : Object | provenance | |
| D.cs:78:17:78:33 | call to method Source<Object> : Object | D.cs:78:13:78:13 | access to local variable o : Object | provenance | |
| D.cs:81:9:81:9 | [post] access to local variable d : DPartial [field _backingField] : Object | D.cs:84:14:84:14 | access to local variable d : DPartial [field _backingField] : Object | provenance | |
| D.cs:81:9:81:9 | [post] access to local variable d : DPartial [field _backingField] : Object | D.cs:84:14:84:14 | access to local variable d : DPartial [field _backingField] : Object | provenance | |
| D.cs:81:26:81:26 | access to local variable o : Object | D.cs:61:9:61:11 | value : Object | provenance | |
| D.cs:81:26:81:26 | access to local variable o : Object | D.cs:61:9:61:11 | value : Object | provenance | |
| D.cs:81:26:81:26 | access to local variable o : Object | D.cs:81:9:81:9 | [post] access to local variable d : DPartial [field _backingField] : Object | provenance | |
| D.cs:81:26:81:26 | access to local variable o : Object | D.cs:81:9:81:9 | [post] access to local variable d : DPartial [field _backingField] : Object | provenance | |
| D.cs:84:14:84:14 | access to local variable d : DPartial [field _backingField] : Object | D.cs:60:9:60:11 | this : DPartial [field _backingField] : Object | provenance | |
| D.cs:84:14:84:14 | access to local variable d : DPartial [field _backingField] : Object | D.cs:60:9:60:11 | this : DPartial [field _backingField] : Object | provenance | |
| D.cs:84:14:84:14 | access to local variable d : DPartial [field _backingField] : Object | D.cs:84:14:84:27 | access to property PartialProp1 | provenance | |
| D.cs:84:14:84:14 | access to local variable d : DPartial [field _backingField] : Object | D.cs:84:14:84:27 | access to property PartialProp1 | provenance | |
| E.cs:8:29:8:29 | o : Object | E.cs:11:21:11:21 | access to parameter o : Object | provenance | |
| E.cs:8:29:8:29 | o : Object | E.cs:11:21:11:21 | access to parameter o : Object | provenance | |
| E.cs:11:9:11:11 | [post] access to local variable ret : S [field Field] : Object | E.cs:12:16:12:18 | access to local variable ret : S [field Field] : Object | provenance | |
Expand Down Expand Up @@ -1745,6 +1769,32 @@ nodes
| D.cs:47:14:47:14 | access to local variable d : D [field trivialPropField] : Object | semmle.label | access to local variable d : D [field trivialPropField] : Object |
| D.cs:47:14:47:26 | access to property ComplexProp | semmle.label | access to property ComplexProp |
| D.cs:47:14:47:26 | access to property ComplexProp | semmle.label | access to property ComplexProp |
| D.cs:60:9:60:11 | this : DPartial [field _backingField] : Object | semmle.label | this : DPartial [field _backingField] : Object |
| D.cs:60:9:60:11 | this : DPartial [field _backingField] : Object | semmle.label | this : DPartial [field _backingField] : Object |
| D.cs:60:22:60:34 | access to field _backingField : Object | semmle.label | access to field _backingField : Object |
| D.cs:60:22:60:34 | access to field _backingField : Object | semmle.label | access to field _backingField : Object |
| D.cs:60:22:60:34 | this access : DPartial [field _backingField] : Object | semmle.label | this access : DPartial [field _backingField] : Object |
| D.cs:60:22:60:34 | this access : DPartial [field _backingField] : Object | semmle.label | this access : DPartial [field _backingField] : Object |
| D.cs:61:9:61:11 | this [Return] : DPartial [field _backingField] : Object | semmle.label | this [Return] : DPartial [field _backingField] : Object |
| D.cs:61:9:61:11 | this [Return] : DPartial [field _backingField] : Object | semmle.label | this [Return] : DPartial [field _backingField] : Object |
| D.cs:61:9:61:11 | value : Object | semmle.label | value : Object |
| D.cs:61:9:61:11 | value : Object | semmle.label | value : Object |
| D.cs:61:15:61:27 | [post] this access : DPartial [field _backingField] : Object | semmle.label | [post] this access : DPartial [field _backingField] : Object |
| D.cs:61:15:61:27 | [post] this access : DPartial [field _backingField] : Object | semmle.label | [post] this access : DPartial [field _backingField] : Object |
| D.cs:61:31:61:35 | access to parameter value : Object | semmle.label | access to parameter value : Object |
| D.cs:61:31:61:35 | access to parameter value : Object | semmle.label | access to parameter value : Object |
| D.cs:78:13:78:13 | access to local variable o : Object | semmle.label | access to local variable o : Object |
| D.cs:78:13:78:13 | access to local variable o : Object | semmle.label | access to local variable o : Object |
| D.cs:78:17:78:33 | call to method Source<Object> : Object | semmle.label | call to method Source<Object> : Object |
| D.cs:78:17:78:33 | call to method Source<Object> : Object | semmle.label | call to method Source<Object> : Object |
| D.cs:81:9:81:9 | [post] access to local variable d : DPartial [field _backingField] : Object | semmle.label | [post] access to local variable d : DPartial [field _backingField] : Object |
| D.cs:81:9:81:9 | [post] access to local variable d : DPartial [field _backingField] : Object | semmle.label | [post] access to local variable d : DPartial [field _backingField] : Object |
| D.cs:81:26:81:26 | access to local variable o : Object | semmle.label | access to local variable o : Object |
| D.cs:81:26:81:26 | access to local variable o : Object | semmle.label | access to local variable o : Object |
| D.cs:84:14:84:14 | access to local variable d : DPartial [field _backingField] : Object | semmle.label | access to local variable d : DPartial [field _backingField] : Object |
| D.cs:84:14:84:14 | access to local variable d : DPartial [field _backingField] : Object | semmle.label | access to local variable d : DPartial [field _backingField] : Object |
| D.cs:84:14:84:27 | access to property PartialProp1 | semmle.label | access to property PartialProp1 |
| D.cs:84:14:84:27 | access to property PartialProp1 | semmle.label | access to property PartialProp1 |
| E.cs:8:29:8:29 | o : Object | semmle.label | o : Object |
| E.cs:8:29:8:29 | o : Object | semmle.label | o : Object |
| E.cs:11:9:11:11 | [post] access to local variable ret : S [field Field] : Object | semmle.label | [post] access to local variable ret : S [field Field] : Object |
Expand Down Expand Up @@ -2582,6 +2632,10 @@ subpaths
| D.cs:45:14:45:14 | access to local variable d : D [field trivialPropField] : Object | D.cs:8:9:8:11 | this : D [field trivialPropField] : Object | D.cs:8:22:8:42 | access to field trivialPropField : Object | D.cs:45:14:45:26 | access to property TrivialProp |
| D.cs:47:14:47:14 | access to local variable d : D [field trivialPropField] : Object | D.cs:14:9:14:11 | this : D [field trivialPropField] : Object | D.cs:14:22:14:42 | access to field trivialPropField : Object | D.cs:47:14:47:26 | access to property ComplexProp |
| D.cs:47:14:47:14 | access to local variable d : D [field trivialPropField] : Object | D.cs:14:9:14:11 | this : D [field trivialPropField] : Object | D.cs:14:22:14:42 | access to field trivialPropField : Object | D.cs:47:14:47:26 | access to property ComplexProp |
| D.cs:81:26:81:26 | access to local variable o : Object | D.cs:61:9:61:11 | value : Object | D.cs:61:9:61:11 | this [Return] : DPartial [field _backingField] : Object | D.cs:81:9:81:9 | [post] access to local variable d : DPartial [field _backingField] : Object |
| D.cs:81:26:81:26 | access to local variable o : Object | D.cs:61:9:61:11 | value : Object | D.cs:61:9:61:11 | this [Return] : DPartial [field _backingField] : Object | D.cs:81:9:81:9 | [post] access to local variable d : DPartial [field _backingField] : Object |
| D.cs:84:14:84:14 | access to local variable d : DPartial [field _backingField] : Object | D.cs:60:9:60:11 | this : DPartial [field _backingField] : Object | D.cs:60:22:60:34 | access to field _backingField : Object | D.cs:84:14:84:27 | access to property PartialProp1 |
| D.cs:84:14:84:14 | access to local variable d : DPartial [field _backingField] : Object | D.cs:60:9:60:11 | this : DPartial [field _backingField] : Object | D.cs:60:22:60:34 | access to field _backingField : Object | D.cs:84:14:84:27 | access to property PartialProp1 |
| E.cs:23:25:23:25 | access to local variable o : Object | E.cs:8:29:8:29 | o : Object | E.cs:12:16:12:18 | access to local variable ret : S [field Field] : Object | E.cs:23:17:23:26 | call to method CreateS : S [field Field] : Object |
| E.cs:23:25:23:25 | access to local variable o : Object | E.cs:8:29:8:29 | o : Object | E.cs:12:16:12:18 | access to local variable ret : S [field Field] : Object | E.cs:23:17:23:26 | call to method CreateS : S [field Field] : Object |
| E.cs:55:29:55:33 | access to local variable taint : Object | E.cs:43:46:43:46 | o : Object | E.cs:43:36:43:36 | s [Return] : RefS [field RefField] : Object | E.cs:55:23:55:26 | [post] access to local variable refs : RefS [field RefField] : Object |
Expand Down Expand Up @@ -2690,6 +2744,8 @@ testFailures
| D.cs:46:14:46:31 | access to field trivialPropField | D.cs:43:32:43:48 | call to method Source<Object> : Object | D.cs:46:14:46:31 | access to field trivialPropField | $@ | D.cs:43:32:43:48 | call to method Source<Object> : Object | call to method Source<Object> : Object |
| D.cs:47:14:47:26 | access to property ComplexProp | D.cs:43:32:43:48 | call to method Source<Object> : Object | D.cs:47:14:47:26 | access to property ComplexProp | $@ | D.cs:43:32:43:48 | call to method Source<Object> : Object | call to method Source<Object> : Object |
| D.cs:47:14:47:26 | access to property ComplexProp | D.cs:43:32:43:48 | call to method Source<Object> : Object | D.cs:47:14:47:26 | access to property ComplexProp | $@ | D.cs:43:32:43:48 | call to method Source<Object> : Object | call to method Source<Object> : Object |
| D.cs:84:14:84:27 | access to property PartialProp1 | D.cs:78:17:78:33 | call to method Source<Object> : Object | D.cs:84:14:84:27 | access to property PartialProp1 | $@ | D.cs:78:17:78:33 | call to method Source<Object> : Object | call to method Source<Object> : Object |
| D.cs:84:14:84:27 | access to property PartialProp1 | D.cs:78:17:78:33 | call to method Source<Object> : Object | D.cs:84:14:84:27 | access to property PartialProp1 | $@ | D.cs:78:17:78:33 | call to method Source<Object> : Object | call to method Source<Object> : Object |
| E.cs:24:14:24:20 | access to field Field | E.cs:22:17:22:33 | call to method Source<Object> : Object | E.cs:24:14:24:20 | access to field Field | $@ | E.cs:22:17:22:33 | call to method Source<Object> : Object | call to method Source<Object> : Object |
| E.cs:24:14:24:20 | access to field Field | E.cs:22:17:22:33 | call to method Source<Object> : Object | E.cs:24:14:24:20 | access to field Field | $@ | E.cs:22:17:22:33 | call to method Source<Object> : Object | call to method Source<Object> : Object |
| E.cs:57:14:57:26 | access to field RefField | E.cs:54:21:54:37 | call to method Source<Object> : Object | E.cs:57:14:57:26 | access to field RefField | $@ | E.cs:54:21:54:37 | call to method Source<Object> : Object | call to method Source<Object> : Object |
Expand Down
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