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[5.9][Macros] Ability to opt-out from auto-propagation of attrs/modifiers #1739

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merged 1 commit into from
Jun 7, 2023
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[5.9][Macros] Ability to opt-out from auto-propagation of attrs/modifiers #1739

merged 1 commit into from
Jun 7, 2023

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@rintaro rintaro commented Jun 7, 2023 •
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Cherry-pick #1738 into release/5.9

  • Explanation: By default, attributes/modifiers on macro expansion syntax are copied/propagated to expanded declarations. But there're cases that behavior is not desirable. Add ability to DeclarationMacro opting-out from it, and handle attributes/modifiers themselves.
  • Scope: Freestanding macro expansion
  • Risk: Low, this doesn't affect existing macro implementations
  • Testing: Added regression test cases.
  • Issue: rdar://110364154
  • Reviewer: Alex Hoppen (@ahoppen) Doug Gregor (@DougGregor)

@rintaro
[Macros] Ability to opt-out from auto-propagation of attrs/modifiers
91546f8 
`DeclarationMacro` now have two optional requirements that is defaulted
to 'true':

  static var propagateFreestandingMacroAttributes: Bool { get }
  static var propagateFreestandingMacroModifiers: Bool { get }

My implementing these and returning 'false', macro expansion systam
won't copy attributes and/or modifiers to the expanded declarations.

rdar://110364154
(cherry picked from commit dc4b08c)
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rintaro commented Jun 7, 2023

@swift-ci Please test

@rintaro rintaro changed the title [Macros] Ability to opt-out from auto-propagation of attrs/modifiers [5.9][Macros] Ability to opt-out from auto-propagation of attrs/modifiers Jun 7, 2023
@rintaro rintaro mentioned this pull request Jun 7, 2023
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rintaro commented Jun 7, 2023

@swift-ci Please test Windows

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@swift-ci please test Windows

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rintaro commented Jun 7, 2023

@swift-ci please test Windows

@shahmishal shahmishal merged commit dd22ee8 into swiftlang:release/5.9 Jun 7, 2023
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@DougGregor DougGregor DougGregor approved these changes

@grynspan grynspan grynspan approved these changes

@ahoppen ahoppen Awaiting requested review from ahoppen ahoppen is a code owner

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