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[alpha.webkit.NoUnretainedMemberChecker] Only check @property when @implementation is seen #159947

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Merged
rniwa merged 4 commits into from
Sep 25, 2025
Merged

[alpha.webkit.NoUnretainedMemberChecker] Only check @property when @implementation is seen #159947

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e369e9c
[alpha.webkit.NoUnretainedMemberChecker] Only check @property when @i…
rniwa Sep 20, 2025
ffa520f
Merge branch 'main' into fix-webkit-ivar-impl-only
rniwa Sep 23, 2025
6d70f15
Add test cases for inherited interfaces
rniwa Sep 24, 2025
c4bd06b
Add a test case for a subclass interface with implementation
rniwa Sep 25, 2025
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19 changes: 9 additions & 10 deletions clang/lib/StaticAnalyzer/Checkers/WebKit/RawPtrRefMemberChecker.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -130,17 +130,16 @@ class RawPtrRefMemberChecker
if (BR->getSourceManager().isInSystemHeader(CD->getLocation()))
return;

ObjCContainerDecl::PropertyMap map;
CD->collectPropertiesToImplement(map);
for (auto it : map)
visitObjCPropertyDecl(CD, it.second);

if (auto *ID = dyn_cast<ObjCInterfaceDecl>(CD)) {
for (auto *Ivar : ID->ivars())
visitIvarDecl(CD, Ivar);
return;
}
if (auto *ID = dyn_cast<ObjCImplementationDecl>(CD)) {
ObjCContainerDecl::PropertyMap map;
CD->collectPropertiesToImplement(map);
for (auto it : map)
visitObjCPropertyDecl(CD, it.second);

if (auto *Interface = ID->getClassInterface()) {
for (auto *Ivar : Interface->ivars())
visitIvarDecl(CD, Ivar);
}
for (auto *PropImpl : ID->property_impls())
visitPropImpl(CD, PropImpl);
for (auto *Ivar : ID->ivars())
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15 changes: 15 additions & 0 deletions clang/test/Analysis/Checkers/WebKit/unretained-members-arc.mm
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Expand Up @@ -84,6 +84,21 @@ @interface AnotherObject : NSObject {
@property(nonatomic, unsafe_unretained) NSString *prop_string3;
// expected-warning@-1{{Property 'prop_string3' in 'AnotherObject' is a raw pointer to retainable type 'NSString'; member variables must be a RetainPtr}}
@property(nonatomic, readonly) NSString *prop_string4;
@property(nonatomic, readonly) NSString *prop_safe;
@end

@implementation AnotherObject
- (NSString *)prop_safe {
return nil;
}
@end

// No warnings for @interface declaration itself.
@interface InterfaceOnlyObject : NSObject
@property(nonatomic, strong) NSString *prop_string1;
@property(nonatomic, assign) NSString *prop_string2;
@property(nonatomic, unsafe_unretained) NSString *prop_string3;
@property(nonatomic, readonly) NSString *prop_string4;
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@t-rasmud t-rasmud Sep 24, 2025

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Hmmm, what if we have a derived interface (with an implementation) that derives from InterfaceOnlyObject? Is the expectation then that the checker reports warnings on these properties (because the derived interface's implementation can access these properties via self)?

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@rniwa rniwa Sep 24, 2025

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In that case, we should be checking each property, yes.

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@rniwa rniwa Sep 24, 2025

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Oh I think we have a bug there. We're not checking superclass's properties.

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@rniwa rniwa Sep 25, 2025

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Actually, that's not really a bug since we don't auto-synthesize a property on a superclass. I added one more test case to test this exact scenario.

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@t-rasmud t-rasmud Sep 25, 2025

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Thank you for the explanation and the additional test cases.

@property(nonatomic, readonly) dispatch_queue_t prop_string5;
@end

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55 changes: 53 additions & 2 deletions clang/test/Analysis/Checkers/WebKit/unretained-members.mm
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Expand Up @@ -112,8 +112,59 @@ @interface AnotherObject : NSObject {
dispatch_queue_t dispatch;
// expected-warning@-1{{Instance variable 'dispatch' in 'AnotherObject' is a retainable type 'dispatch_queue_t'}}
}
@property(nonatomic, strong) NSString *prop_string;
// expected-warning@-1{{Property 'prop_string' in 'AnotherObject' is a raw pointer to retainable type 'NSString'}}
@property(nonatomic, readonly, strong) NSString *prop_string;
// expected-warning@-1{{Property 'prop_string' in 'AnotherObject' is a raw pointer to retainable type 'NSString'; member variables must be a RetainPtr}}
@property(nonatomic, readonly) NSString *prop_safe;
@end

@implementation AnotherObject
- (NSString *)prop_safe {
return nil;
}
@end

@interface DerivedObject : AnotherObject {
NSNumber *ns_number;
// expected-warning@-1{{Instance variable 'ns_number' in 'DerivedObject' is a raw pointer to retainable type 'NSNumber'}}
CGImageRef cg_image;
// expected-warning@-1{{Instance variable 'cg_image' in 'DerivedObject' is a retainable type 'CGImageRef'}}
dispatch_queue_t os_dispatch;
// expected-warning@-1{{Instance variable 'os_dispatch' in 'DerivedObject' is a retainable type 'dispatch_queue_t'}}
}
@property(nonatomic, strong) NSNumber *prop_number;
// expected-warning@-1{{Property 'prop_number' in 'DerivedObject' is a raw pointer to retainable type 'NSNumber'; member variables must be a RetainPtr}}
@property(nonatomic, readonly) NSString *prop_string;
@end

@implementation DerivedObject
- (NSString *)prop_string {
return nil;
}
@end

// No warnings for @interface declaration itself.
@interface InterfaceOnlyObject : NSObject
@property(nonatomic, strong) NSString *prop_string1;
@property(nonatomic, assign) NSString *prop_string2;
@property(nonatomic, unsafe_unretained) NSString *prop_string3;
@property(nonatomic, readonly) NSString *prop_string4;
@end

@interface InterfaceOnlyObject2 : NSObject
@property(nonatomic, strong) NSString *prop_string1;
@property(nonatomic, assign) NSString *prop_string2;
@property(nonatomic, unsafe_unretained) NSString *prop_string3;
// expected-warning@-1{{Property 'prop_string3' in 'DerivedObject2' is a raw pointer to retainable type 'NSString'}}
@property(nonatomic, readonly) NSString *prop_string4;
@end

@interface DerivedObject2 : InterfaceOnlyObject2
@property(nonatomic, readonly) NSString *prop_string5;
// expected-warning@-1{{Property 'prop_string5' in 'DerivedObject2' is a raw pointer to retainable type 'NSString'}}
@end

@implementation DerivedObject2
@synthesize prop_string3;
@end

NS_REQUIRES_PROPERTY_DEFINITIONS
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