Collection expressions: IOperation support #70650

cston · 2023-11-01T06:11:05Z

See API proposal #70631.

Relates to test plan #66418

333fred · 2023-11-20T21:09:23Z

src/Features/CSharpTest/SyncNamespace/SyncNamespaceTests_ChangeNamespace.cs

@@ -2343,7 +2343,7 @@ public async Task ChangeNamespace_DoesNotThrowInDuplicateProgramDeclaration()

            // No change namespace action because the folder name is not valid identifier
            var (topLevelProgramFolder, topLevelProgramFilePath) = CreateDocumentFilePath(["3B", "C"], "Program.cs");
-            var (duplicateProgramFolder, duplicateProgramFilePath) = CreateDocumentFilePath([], "Program.cs");
+            var (duplicateProgramFolder, _) = CreateDocumentFilePath([], "Program.cs");


Is this change related to the PR? #Resolved

Yes, with this change, an analyzer reports a diagnostic here for an unnecessary assignment.

AlekseyTs · 2023-11-22T01:25:13Z

Are we testing control flow graph with control flow constructs within a collection expression?

cston · 2023-11-22T16:15:44Z

Are we testing control flow graph with control flow constructs within a collection expression?

CollectionExpressionTests.IOperation_01 and _02.

cston · 2023-11-29T00:04:39Z

@dotnet/roslyn-compiler, please review, thanks.

jcouv · 2023-11-29T18:42:04Z

Looking

jcouv · 2023-11-29T18:47:47Z

src/Compilers/Core/Portable/Operations/OperationInterfaces.xml

+      </Comments>
+    </Property>
+  </Node>
+  <Node Name="ISpreadOperation" Base="IOperation" HasType="true">


HasType="true"

That seems unexpected. What's the type of a spread? #Resolved

Good catch, thanks.

jcouv · 2023-11-29T19:08:20Z

src/Compilers/Core/Portable/Operations/ControlFlowGraphBuilder.cs

+                operation.Type,
+                IsImplicit(operation));
+
+            static IOperation unwrapElement(IOperation element)


unwrapElement

static? #Closed

jcouv · 2023-11-29T19:09:21Z

src/Compilers/Core/Portable/Operations/ControlFlowGraphBuilder.cs

+        public override IOperation? VisitCollectionExpression(ICollectionExpressionOperation operation, int? argument)
+        {
+            EvalStackFrame frame = PushStackFrame();
+            var elements = VisitArray(operation.Elements, unwrapElement, wrapElement);


wrapElement

nit: it seems wrapElement can't be made static (it uses instance method IsImplicit). Consider using a lambda around it to cache the allocated delegate. #Resolved

Changed both local functions to lambda expressions.

jcouv · 2023-11-29T19:20:34Z

src/Compilers/Core/Portable/Operations/ControlFlowGraphBuilder.cs

@@ -6368,6 +6368,46 @@ IArrayInitializerOperation popAndAssembleArrayInitializerValues(IArrayInitialize
            }
        }

+        public override IOperation? VisitCollectionExpression(ICollectionExpressionOperation operation, int? argument)


Looking at VisitInterpolatedStringHandlerCreation below, I would have expected the CFG for collection expression to surface the nitty-gritty details of the collection evaluation. It sounds like this was discussed/approved in API review, but I'm not clear on whether this is the level of abstraction for CFG that we want moving forward? #Closed

Resolved offline. This is the result of a case-by-case discussion in API review considering the needs of the CFG customer. Thanks

jcouv · 2023-11-29T20:21:26Z

src/Compilers/CSharp/Portable/Operations/CSharpOperationFactory.cs

            }
        }

-        private IOperation CreateBoundCollectionExpressionSpreadElement(BoundCollectionExpressionSpreadElement boundSpreadExpression)
+        private IOperation CreateBoundCollectionExpressionSpreadElement(BoundCollectionExpressionSpreadElement element, BoundExpression? iteratorItem)


IOperation

nit: consider declaring a more specific return type #Resolved

jcouv · 2023-11-29T20:22:57Z

src/Compilers/CSharp/Portable/Operations/CSharpOperationFactory.cs

            }
        }

-        private IOperation CreateBoundCollectionExpressionSpreadElement(BoundCollectionExpressionSpreadElement boundSpreadExpression)
+        private IOperation CreateBoundCollectionExpressionSpreadElement(BoundCollectionExpressionSpreadElement element, BoundExpression? iteratorItem)


Consider doc for iteratorItem #Resolved

Removed parameter.

jcouv · 2023-11-29T20:23:25Z

src/Compilers/CSharp/Portable/Operations/CSharpOperationFactory.cs

+            }
+            return Create(getUnderlyingExpression((BoundExpression)element));
+
+            [return: NotNullIfNotNull("element")] static BoundExpression? getUnderlyingExpression(BoundExpression? element)


"element"

nameof(element)? #Resolved

jcouv · 2023-11-29T21:52:46Z

nit: consider adding a test that shows more interesting element conversions than identity or reference conversions. For instance, a collection with different Add methods where each element gets its own conversion. #Resolved

Refers to: src/Compilers/CSharp/Test/Emit2/Semantics/CollectionExpressionTests.cs:21265 in 7320176. [](commit_id = 7320176, deletion_comment = False)

jcouv

LGTM Thanks (iteration 9) with some nits to consider

cston · 2023-11-29T22:15:00Z

Added CollectionInitializerType_20 with multiple Add methods and nullable and boxing conversions.

In reply to: 1832759003

Refers to: src/Compilers/CSharp/Test/Emit2/Semantics/CollectionExpressionTests.cs:21265 in 7320176. [](commit_id = 7320176, deletion_comment = False)

dotnet-issue-labeler bot added Area-Compilers untriaged Issues and PRs which have not yet been triaged by a lead labels Nov 1, 2023

cston force-pushed the collections-ioperation branch from ce50d29 to f5c7696 Compare November 1, 2023 20:57

cston added the New Feature - Collection Expressions label Nov 2, 2023

Collection expressions: IOperation support

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cston force-pushed the collections-ioperation branch 2 times, most recently from d1f454a to 86b01ce Compare November 2, 2023 17:38

Update API

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cston force-pushed the collections-ioperation branch 3 times, most recently from 35b30f3 to ad8cdd6 Compare November 2, 2023 21:08

Fix tests

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cston force-pushed the collections-ioperation branch from ad8cdd6 to 398b930 Compare November 3, 2023 03:39

Use ArrayCreationOperation when possible

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cston force-pushed the collections-ioperation branch 9 times, most recently from 8871fda to 65a4ae9 Compare November 15, 2023 06:28

Simplify API

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cston force-pushed the collections-ioperation branch from 65a4ae9 to 5f2379c Compare November 15, 2023 17:35

Use BoundCollectionInitializer for spread iterator body

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cston force-pushed the collections-ioperation branch 3 times, most recently from 2c1626f to f3bb8d1 Compare November 19, 2023 20:08

Update API following review

bfb8667

333fred reviewed Nov 20, 2023

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333fred approved these changes Nov 20, 2023

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cston requested a review from a team November 20, 2023 21:45

cston mentioned this pull request Nov 28, 2023

Collection expressions: align ConversionsBase.GetCollectionExpressionTypeKind() with spec #70975

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jcouv self-assigned this Nov 29, 2023

jcouv reviewed Nov 29, 2023

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cston added 2 commits November 29, 2023 12:27

Merge remote-tracking branch 'upstream/main' into collections-ioperation

7320176

Address feedback

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jcouv approved these changes Nov 29, 2023

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Add test

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cston merged commit 772aefd into dotnet:main Nov 30, 2023
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cston deleted the collections-ioperation branch November 30, 2023 00:03

ghost added this to the Next milestone Nov 30, 2023

cston mentioned this pull request Nov 30, 2023

[API proposal] Collection expressions: IOperation support #70631

Closed

allisonchou mentioned this pull request Dec 5, 2023

[Automated] PRs inserted in VS build main-34404.193 #71093

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Cosifne modified the milestones: Next, 17.9 P3 Jan 9, 2024

cston mentioned this pull request Jan 26, 2024

Initializing a ConcurrentBag with a dynamic variable using a collection initializer results in MSB6006 "csc.exe" exited with code -2146232797 #71703

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Collection expressions: IOperation support #70650

Collection expressions: IOperation support #70650

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Collection expressions: IOperation support #70650

Collection expressions: IOperation support #70650

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