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Doug Gregor
f2340ec9af
A C function returning a foreign reference or CoreFoundation type unretained cannot be safely implemented, because there is no way to ensure that the result object lives past the return. However, such C functions do exist, and we would like to be able to implement them via `@c @implementation`. Extend the signature-matching logic for `@implementation` to permit an `Unmanaged<T>` result even when the signature comes in an `T` to allow the use of `@implementation` here. Implements rdar://188429740
34 lines
996 B
C
34 lines
996 B
C
@import Foundation;
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#define CF_RETURNS_RETAINED __attribute__((cf_returns_retained))
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#define CF_RETURNS_NOT_RETAINED __attribute__((cf_returns_not_retained))
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#define CF_CONSUMED __attribute__((cf_consumed))
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CF_RETURNS_RETAINED
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CFStringRef returns_retained(void);
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CF_RETURNS_NOT_RETAINED
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CFStringRef returns_not_retained(void);
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void passes_borrowed(CFStringRef string);
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void passes_consumed(CF_CONSUMED CFStringRef string);
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// Not ownership-audited, so this is imported as returning
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// 'Unmanaged<CFString>?'.
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CFStringRef returns_unaudited(void);
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// 'CFTypeRef' is imported as 'AnyObject', and uses the same reference counting.
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void passes_any_borrowed(CFTypeRef obj);
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CF_RETURNS_RETAINED
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CFTypeRef returns_any_retained(void);
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// Audited results can be implemented as returning 'Unmanaged', which is
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// returned without any retain or autorelease.
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CF_RETURNS_NOT_RETAINED
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CFStringRef returns_not_retained_unmanaged(void);
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CF_RETURNS_RETAINED
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CFStringRef returns_retained_unmanaged(void);
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