https://llvm.org/bugs/show_bug.cgi?id=24328
Bug ID: 24328
Summary: clang should warn returning nil from Obj-C method that
returns nonnull
Product: new-bugs
Version: trunk
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 14678
--> https://llvm.org/bugs/attachment.cgi?id=14678&action=edit
repro case
clang warns if a C function with "nonnull" specified on the return value
actually does returns null. That's good. It should, but doesn't, do the same
for Obj-C methods.
Consider attached sample:
-----------------------------------------------
#import <Foundation/Foundation.h>
@interface MyObj : NSObject
@end
@implementation MyObj
+ (nonnull id)method
{
return nil; // WANT WARNING HERE
}
@end
static void* __nonnull MyFunction (void)
{
return NULL;
}
int main(void)
{
MyFunction();
[MyObj method];
return 0;
}
-----------------------------------------------
built with:
clang version 3.8.0 (trunk 243643)
Target: x86_64-apple-darwin14.4.0
Thread model: posix
clang -fsyntax-only -Weverything test.m
gives:
test.m:15:2: warning: null returned from function that requires a non-null
return value [-Wnonnull]
return NULL;
^ ~~~~
ie, works for function, but not method.
(Xcode 6.4 and 7.0b4 clang also fail to warn, see <rdar://22093658>.)
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