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427386feea
When an @objc @implementation class requires the use of `ClassMetadataStrategy::Update` because some of its stored properties do not have fixed sizes, we adjust the direct field offsets during class realization by emitting a custom metadata update function which calls a new entry point in the Swift runtime. That entry point adjusts field offsets like `swift_updateClassMetadata2()`, but it only assumes that the class has Objective-C metadata, not Swift metadata. This commit introduces an alternative mechanism which does the same thing without using any Swift-only metadata. It’s a rough implementation with important limitations: • We’re currently using the field offset vector, which means that field offsets are being emitted into @objc @implementation classes; these will be removed. • The new Swift runtime entry point duplicates a lot of `swift_updateClassMetadata2()`’s implementation; it will be refactored into something much smaller and more compact. • Availability bounds for this feature have not yet been implemented. Future commits in this PR will correct these issues.
33 lines
611 B
Objective-C
33 lines
611 B
Objective-C
#import <Foundation/Foundation.h>
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NS_ASSUME_NONNULL_BEGIN
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@class ImplClassWithResilientStoredProperty;
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@interface ImplClass : NSObject
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- (instancetype)init;
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@property (assign) NSInteger implProperty;
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@property (assign) NSInteger defaultIntProperty;
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+ (void)runTests;
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+ (ImplClassWithResilientStoredProperty *)makeResilientImpl;
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- (void)testSelf;
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- (void)printSelfWithLabel:(int)label;
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- (nonnull NSString *)someMethod;
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@end
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@interface ImplClassWithResilientStoredProperty : NSObject
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- (void)printSelfWithLabel:(int)label;
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- (void)mutate;
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@end
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extern void implFunc(int param);
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NS_ASSUME_NONNULL_END
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