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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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7
stdlib/public/runtime/HeapObject.cpp
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@@ -31,6 +31,7 @@
#include <cstdio>
#include <cstdlib>
#include <thread>
#include "../SwiftShims/GlobalObjects.h"
#include "../SwiftShims/RuntimeShims.h"
#if SWIFT_OBJC_INTEROP
# include <objc/NSObject.h>
@@ -227,6 +228,12 @@ OpaqueValue *swift::swift_projectBox(HeapObject *o) {
return metadata->project(o);
}
HeapObject *swift::swift_allocEmptyBox() {
auto heapObject = reinterpret_cast<HeapObject*>(&_EmptyBoxStorage);
SWIFT_RT_ENTRY_CALL(swift_retain)(heapObject);
return heapObject;
}
// Forward-declare this, but define it after swift_release.
extern "C" LLVM_LIBRARY_VISIBILITY LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED
void _swift_release_dealloc(HeapObject *object) SWIFT_CC(RegisterPreservingCC_IMPL);