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Standardize list pattern lowering on Index constructor. #58055

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merged 4 commits into from
Dec 4, 2021

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AlekseyTs
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@AlekseyTs AlekseyTs commented Dec 1, 2021

Fixes #57825.
Relevant spec adjustment dotnet/csharplang#5484.

Relates to test plan: #51289

@AlekseyTs AlekseyTs requested review from 333fred and jcouv December 1, 2021 14:18
@AlekseyTs AlekseyTs requested a review from a team as a code owner December 1, 2021 14:19
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@jcouv, @333fred, @dotnet/roslyn-compiler Please review.

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LGTM (commit 3)

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@jcouv, @dotnet/roslyn-compiler For the second review.

@@ -432,6 +432,24 @@ private enum PatternIndexOffsetLoweringStrategy
strategy = PatternIndexOffsetLoweringStrategy.UseAsIs;
return VisitExpression(operand);
}
else if (unloweredExpr is BoundObjectCreationExpression { Constructor: MethodSymbol constructor, Arguments: { Length: 2 } arguments, ArgsToParamsOpt: { IsDefaultOrEmpty: true }, InitializerExpressionOpt: null } &&
(object)constructor == _compilation.GetWellKnownTypeMember(WellKnownMember.System_Index__ctor) &&
arguments[0] is { Type.SpecialType: SpecialType.System_Int32, ConstantValue.Value: int _ and >= 0 } index &&
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_

nit: could remove the discard designation

@@ -432,6 +432,24 @@ private enum PatternIndexOffsetLoweringStrategy
strategy = PatternIndexOffsetLoweringStrategy.UseAsIs;
return VisitExpression(operand);
}
else if (unloweredExpr is BoundObjectCreationExpression { Constructor: MethodSymbol constructor, Arguments: { Length: 2 } arguments, ArgsToParamsOpt: { IsDefaultOrEmpty: true }, InitializerExpressionOpt: null } &&
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InitializerExpressionOpt: null

nit: do we have a indexing test with an Index initialization with an initializer? #Resolved

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do we have a indexing test with an Index initialization with an initializer?

No, the type doesn't have any member that can be initialized, but I decided to have the check for completeness.

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LGTM Thanks! (iteration 3)

@jcouv jcouv self-assigned this Dec 1, 2021
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/azp run

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Azure Pipelines successfully started running 4 pipeline(s).

@AlekseyTs AlekseyTs merged commit 358d4ae into dotnet:main Dec 4, 2021
@ghost ghost added this to the Next milestone Dec 4, 2021
333fred added a commit to 333fred/roslyn that referenced this pull request Dec 6, 2021
…rovements

* upstream/main: (68 commits)
  Lazy load ISourceLinkService to reduce DLL loads (dotnet#58108)
  [main] Update dependencies from dotnet/source-build (dotnet#57707)
  [main] Update dependencies from dotnet/arcade (dotnet#57968)
  Factor nullability logic for placeholders (dotnet#58036)
  Standardize list pattern lowering on `Index` constructor. (dotnet#58055)
  Add scripts to verify if a branch is ready to review
  Merge pull request dotnet#58100 from dotnet/dev/jorobich/skip-test
  Fix some places we weren't correctly disposing of VisualStudioAnalyzers
  Fix analyzer references being removed and added in one batch
  Fix indenting
  Ensure we don't silently capture any exceptions
  Don't MEF import the implementation directly if the public type will do
  Change comment
  Add comment
  Use actual jump tables
  Remove unused function
  Revert
  Simplify code
  Compute kind on demand
  Reorder
  ...
@Cosifne Cosifne modified the milestones: Next, 17.1.P3 Jan 5, 2022
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List-patterns: lowering assumes the conversion from int to Index will use the implicit conversion operator
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