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IRGen: EmptyBoxType's representation cannot be nil because of a conflict with extra inhabitant assumption in indirect enums (#10326)

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* IRGen: EmptyBoxType's representation cannot be nil because of a conflict with extra inhabitant assumption in indirect enums

We map nil to the .None case of Optional. Instead use a singleton object.

SR-5148
rdar://32618580
This commit is contained in:
Arnold Schwaighofer
2017-06-17 09:33:41 -07:00
committed by GitHub
parent 6f3b8ca60f
commit 48e889b51b
13 changed files with 113 additions and 5 deletions
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5
include/swift/Runtime/RuntimeFunctions.def
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@@ -73,6 +73,11 @@ FUNCTION(ProjectBox, swift_projectBox, DefaultCC,
ARGS(RefCountedPtrTy),
ATTRS(NoUnwind, ReadNone))
FUNCTION(AllocEmptyBox, swift_allocEmptyBox, DefaultCC,
RETURNS(RefCountedPtrTy),
ARGS(),
ATTRS(NoUnwind))
// RefCounted *swift_allocObject(Metadata *type, size_t size, size_t alignMask);
FUNCTION_WITH_GLOBAL_SYMBOL_AND_IMPL(AllocObject, swift_allocObject,
_swift_allocObject, _swift_allocObject_, RegisterPreservingCC,