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[SR-3732] Lock down the layout of a protocol witness table #46317

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ematejska mannequin opened this issue Jan 25, 2017 · 3 comments
Closed

[SR-3732] Lock down the layout of a protocol witness table #46317

ematejska mannequin opened this issue Jan 25, 2017 · 3 comments
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affects ABI Flag: Affects ABI task

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@ematejska
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ematejska mannequin commented Jan 25, 2017

Previous ID SR-3732
Radar rdar://problem/31411201
Original Reporter @ematejska
Type Task
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
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Labels Task, AffectsABI
Assignee None
Priority Medium

md5: aaddd601f93b5cf0ce1a5be73a9d2bb1

Issue Description:

Protocol witness tables may be created dynamically by the runtime or statically by the compiler. The layout of a protocol witness table is ABI and we need to determine a layout algorithm that also accommodates library evolution concerns, where additional protocol requirements may be added with default fall-backs.
@bob-wilson
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@swift-ci create

@atrick
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atrick commented Sep 1, 2017

To support specialized witness tables in the future, we may need to install a unique identifier in the first word of the witness table to identify the conformance.

@slavapestov
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The unique identifier is done now that @DougGregor added conformance records. If anyone thinks of anything else, please file a new bug.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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affects ABI Flag: Affects ABI task
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@slavapestov @atrick @bob-wilson