| //===--- SwiftNativeNSXXXBaseARC.mm - Runtime stubs that require ARC ------===// |
| // |
| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See https://swift.org/LICENSE.txt for license information |
| // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| // |
| //===----------------------------------------------------------------------===// |
| #include "swift/Runtime/Config.h" |
| |
| #if SWIFT_OBJC_INTEROP |
| |
| #import <Foundation/Foundation.h> |
| #import <CoreFoundation/CoreFoundation.h> |
| #include <objc/NSObject.h> |
| #include <objc/runtime.h> |
| #include <objc/objc.h> |
| |
| // The following two routines need to be implemented in ARC because |
| // decomposedStringWithCanonicalMapping returns its result autoreleased. And we |
| // want ARC to insert 'objc_retainAutoreleasedReturnValue' and the necessary |
| // markers for the hand-off to facilitate the remove from autorelease pool |
| // optimization such that the object is not handed into the current autorelease |
| // pool which might be scoped such that repeatedly placing objects into it |
| // results in unbounded memory growth. |
| |
| // On i386 the remove from autorelease pool optimization is foiled by the |
| // decomposedStringWithCanonicalMapping implementation. Instead, we use a local |
| // autorelease pool to prevent leaking of the temporary object into the callers |
| // autorelease pool. |
| // |
| // |
| // FIXME: Right now we force an autoreleasepool here on x86_64 where we really |
| // do not want to do so. The reason why is that without the autoreleasepool (or |
| // really something like a defer), we tail call |
| // objc_retainAutoreleasedReturnValue which blocks the hand shake. Evidently |
| // this is something that we do not want to do. See: |
| // b79ff50f1bca97ecfd053372f5f6dc9d017398bc. Until that is resolved, just create |
| // an autoreleasepool here on x86_64. On arm/arm64 we do not have such an issue |
| // since we use an assembly marker instead. |
| #if defined(__i386__) || defined(__x86_64__) |
| #define AUTORELEASEPOOL @autoreleasepool |
| #else |
| // On other platforms we rely on the remove from autorelease pool optimization. |
| #define AUTORELEASEPOOL |
| #endif |
| |
| SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_API |
| size_t swift_stdlib_NSStringHashValue(NSString *str, |
| bool isASCII) { |
| AUTORELEASEPOOL { |
| return isASCII ? str.hash : str.decomposedStringWithCanonicalMapping.hash; |
| } |
| } |
| |
| SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_API |
| size_t |
| swift_stdlib_NSStringHashValuePointer(void *opaque, bool isASCII) { |
| NSString __unsafe_unretained *str = |
| (__bridge NSString __unsafe_unretained *)opaque; |
| AUTORELEASEPOOL { |
| return isASCII ? str.hash : str.decomposedStringWithCanonicalMapping.hash; |
| } |
| } |
| |
| #else |
| |
| extern char ignore_pedantic_warning; |
| |
| #endif |