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1368db7872
class B<T> : NSFoo {}
class A : B<Int> {}
IRGen computes the ivar layout starting from offset zero, since
the size of the 'NSFoo' is unknown and we rely on the Objective-C
runtime to slide the ivar offsets.
The instantiated metadata for B<Int> would contain a field offset
vector with the correct offsets, because of how
swift_initClassMetadata_UniversalStrategy() works.
However, A's metadata is emitted statically, and this includes a
copy of the field offset vector from the superclass. A's metadata
was initialized by swift_initializeSuperclass(), which did not
copy the field offset vector over from A<Int>. And since the
Objective-C runtime only slides the immediate ivars of a class,
the field offsets corresponding to A<Int>'s fields in B's type
metadata were never slid, resulting in problems when an instance
of B was passed to a function operating on an A<T> generically.
Fixes <rdar://problem/23200051>.
22 lines
529 B
Objective-C
22 lines
529 B
Objective-C
#ifndef SWIFT_TEST_OBJC_CLASSES_H
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#define SWIFT_TEST_OBJC_CLASSES_H
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#include <Foundation/NSObject.h>
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/* This class has instance variables which are not apparent in the
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interface. Subclasses will need to be slid by the ObjC runtime. */
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@interface HasHiddenIvars : NSObject
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@property NSInteger x;
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@property NSInteger y;
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@property NSInteger z;
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@property NSInteger t;
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@end
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/* This class has a method that doesn't fill in the error properly. */
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@interface NilError : NSObject
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+ (BOOL) throwIt: (NSError**) error;
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@end
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#endif
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