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[SR-4353] Use word-size field in native object header for reference counting #46932

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bob-wilson opened this issue Mar 24, 2017 · 2 comments
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[SR-4353] Use word-size field in native object header for reference counting #46932

bob-wilson opened this issue Mar 24, 2017 · 2 comments
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@gparker42
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affects ABI Flag: Affects ABI compiler The Swift compiler in itself improvement

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@bob-wilson
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Previous ID SR-4353
Radar rdar://problem/29765800
Original Reporter @bob-wilson
Type Improvement
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement, AffectsABI
Assignee @gparker42
Priority Medium

md5: acede700f07b312a6e3ed4b7bd66e0e3

Issue Description:

The plan for the stable ABI is to have a word-sized field in the native object header that can be used for reference counting. So far, we have had a fixed-size 64-bit field for that purpose. Greg Parker's work on the new reference counting implementation (#5282 sets the stage for this, but we still need to shrink the size of that field on 32-bit targets.
@gparker42
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Mannequin

gparker42 mannequin commented Mar 24, 2017

WIP: #7837

Need to correct one place in the reflection (`readMetadataSource` in ReflectionContext.h) and coordinate with the debugger and tools.

@bob-wilson
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Greg did this in #12790

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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affects ABI Flag: Affects ABI compiler The Swift compiler in itself improvement
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@bob-wilson