131 lines
3.5 KiB
Objective-C
131 lines
3.5 KiB
Objective-C
// RUN: %clang_cc1 -verify -Wused-but-marked-unused -Wno-objc-protocol-method-implementation -Wunused -Wunused-parameter -fsyntax-only -Wno-objc-root-class %s
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int printf(const char *, ...);
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@interface Greeter
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+ (void) hello;
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@end
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@implementation Greeter
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+ (void) hello { printf("Hello, World!\n"); }
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@end
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int test1(void) {
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[Greeter hello];
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return 0;
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}
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@interface NSObject @end
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@interface NSString : NSObject
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- (int)length;
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@end
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void test2() {
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@"pointless example call for test purposes".length; // expected-warning {{property access result unused - getters should not be used for side effects}}
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}
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@interface foo
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- (int)meth: (int)x : (int)y : (int)z ;
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@end
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@implementation foo
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- (int) meth: (int)x: // expected-warning {{'x' used as the name of the previous parameter rather than as part of the selector}} \
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// expected-note {{introduce a parameter name to make 'x' part of the selector}} \
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// expected-note {{or insert whitespace before ':' to use 'x' as parameter name and have an empty entry in the selector}}
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(int)y: // expected-warning {{unused}} expected-warning {{'y' used as the name of the previous parameter rather than as part of the selector}} \
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// expected-note {{introduce a parameter name to make 'y' part of the selector}} \
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// expected-note {{or insert whitespace before ':' to use 'y' as parameter name and have an empty entry in the selector}}
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(int) __attribute__((unused))z { return x; }
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@end
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//===------------------------------------------------------------------------===
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// The next test shows how clang accepted attribute((unused)) on ObjC
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// instance variables, which GCC does not.
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//===------------------------------------------------------------------------===
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#if __has_feature(attribute_objc_ivar_unused)
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#define UNUSED_IVAR __attribute__((unused))
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#else
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#error __attribute__((unused)) not supported on ivars
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#endif
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@interface TestUnusedIvar {
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id y __attribute__((unused)); // no-warning
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id x UNUSED_IVAR; // no-warning
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}
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@end
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// rdar://10777111
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static NSString *x = @"hi"; // expected-warning {{unused variable 'x'}}
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// rdar://12233989
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@interface TestTransitiveUnused
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- (void) a __attribute__((unused));
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- (void) b __attribute__((unused));
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@end
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@interface TestTransitiveUnused(CAT)
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@end
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@implementation TestTransitiveUnused(CAT)
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- (void) b {}
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- (void) a { [self b]; }
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@end
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// Test that objc_precise_lifetime suppresses
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// unused variable warnings.
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extern void rdar15596883_foo(void);
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void rdar15596883(id x) {
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__attribute__((objc_precise_lifetime)) id y = x; // no-warning
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rdar15596883_foo();
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}
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@interface PropertyObject : NSObject
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@property int length;
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@end
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@protocol P
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@property int property;
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@end
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void test3(PropertyObject *o)
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{
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[o length]; // No warning. property name used in direct method call.
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}
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void test4(id o)
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{
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[o length]; // No warning.
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}
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void test5(id <P> p)
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{
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[p property]; // No warning. property name used in direct method call.
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}
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// rdar://19773512
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@interface Model
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@property (nonatomic, retain, setter=setOrCreateGroup:, getter=getOrCreateGroup) id group;
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@end
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@implementation Model {
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id _group;
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}
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- (void)method {
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[self getOrCreateGroup];
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self.getOrCreateGroup; // expected-warning {{property access result unused - getters should not be used for side effects}}
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self.group; // expected-warning {{property access result unused - getters should not be used for side effects}}
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self.group = (void*)0;
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[self setOrCreateGroup : ((void*)0)];
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}
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- (id)getOrCreateGroup {
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if (!_group) {
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_group = @"group";
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}
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return _group;
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}
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@end
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