https://github.com/dmaclach created https://github.com/llvm/llvm-project/pull/84593
As per https://clang.llvm.org/docs/AutomaticReferenceCounting.html#retainable-object-pointers, types with `__attribute__((NSObject))` are retainable, and thus should be eligible to be used as lightweight generic specifiers. Fix for #84592 84592 >From fe3ac2146f6fb969975848a9137b38eb2eb1d918 Mon Sep 17 00:00:00 2001 From: Dave MacLachlan <dmacl...@gmail.com> Date: Fri, 8 Mar 2024 15:14:56 -0800 Subject: [PATCH] Allow __attribute__((NSObject)) types be used as lightweight generic specifiers As per https://clang.llvm.org/docs/AutomaticReferenceCounting.html#retainable-object-pointers, types with `__attribute__((NSObject))` are retainable, and thus should be eligible to be used as lightweight generic specifiers. --- clang/lib/Sema/SemaType.cpp | 5 +++++ clang/test/SemaObjC/attr-objc-NSObject.m | 23 +++++++++++++++++++++++ 2 files changed, 28 insertions(+) create mode 100644 clang/test/SemaObjC/attr-objc-NSObject.m diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp index 3148299f6467af..87173a52af8143 100644 --- a/clang/lib/Sema/SemaType.cpp +++ b/clang/lib/Sema/SemaType.cpp @@ -1018,6 +1018,11 @@ static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type, return type; } + // Types that have __attribute__((NSObject)) are permitted. + if (typeArg->isObjCNSObjectType()) { + continue; + } + // Dependent types will be checked at instantiation time. if (typeArg->isDependentType()) { continue; diff --git a/clang/test/SemaObjC/attr-objc-NSObject.m b/clang/test/SemaObjC/attr-objc-NSObject.m new file mode 100644 index 00000000000000..76a01dcef01637 --- /dev/null +++ b/clang/test/SemaObjC/attr-objc-NSObject.m @@ -0,0 +1,23 @@ +// RUN: %clang_cc1 -verify -Wno-objc-root-class -fsyntax-only %s + +@interface NSArray<__covariant ObjectType> +- (void)containsObject:(ObjectType)anObject; // expected-note {{passing argument to parameter 'anObject' here}} +- (void)description; +@end + +typedef __attribute__((NSObject)) struct Foo *FooRef; +typedef struct Bar *BarRef; + +void good() { + FooRef object; + NSArray<FooRef> *array; + [array containsObject:object]; + [object description]; +} + +void bad() { + BarRef object; + NSArray<BarRef> *array; // expected-error {{type argument 'BarRef' (aka 'struct Bar *') is neither an Objective-C object nor a block type}} + [array containsObject:object]; // expected-warning {{incompatible pointer types sending 'BarRef' (aka 'struct Bar *') to parameter of type 'id'}} + [object description]; // expected-warning {{receiver type 'BarRef' (aka 'struct Bar *') is not 'id' or interface pointer, consider casting it to 'id'}} +} _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
