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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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4
include/swift/Runtime/HeapObject.h
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@@ -169,6 +169,10 @@ SWIFT_RUNTIME_EXPORT
BoxPair::Return swift_makeBoxUnique(OpaqueValue *buffer, Metadata const *type,
size_t alignMask);
/// Returns the address of a heap object representing all empty box types.
SWIFT_RUNTIME_EXPORT
HeapObject* swift_allocEmptyBox();
// Allocate plain old memory. This is the generalized entry point
// Never returns nil. The returned memory is uninitialized.
//