1// RUN: %clang_cc1 -verify -Wused-but-marked-unused -Wno-objc-protocol-method-implementation -Wunused -Wunused-parameter -fsyntax-only -Wno-objc-root-class %s 2 3int printf(const char *, ...); 4 5@interface Greeter 6+ (void) hello; 7@end 8 9@implementation Greeter 10+ (void) hello { printf("Hello, World!\n"); } 11@end 12 13int test1(void) { 14 [Greeter hello]; 15 return 0; 16} 17 18@interface NSObject @end 19@interface NSString : NSObject 20- (int)length; 21@end 22 23void test2(void) { 24 @"pointless example call for test purposes".length; // expected-warning {{property access result unused - getters should not be used for side effects}} 25} 26 27@interface foo 28- (int)meth: (int)x : (int)y : (int)z ; 29@end 30 31@implementation foo 32- (int) meth: (int)x: // expected-warning {{'x' used as the name of the previous parameter rather than as part of the selector}} \ 33 // expected-note {{introduce a parameter name to make 'x' part of the selector}} \ 34 // expected-note {{or insert whitespace before ':' to use 'x' as parameter name and have an empty entry in the selector}} 35 36(int)y: // expected-warning {{'y' used as the name of the previous parameter rather than as part of the selector}} \ 37 // expected-note {{introduce a parameter name to make 'y' part of the selector}} \ 38 // expected-note {{or insert whitespace before ':' to use 'y' as parameter name and have an empty entry in the selector}} 39(int) __attribute__((unused))z { return x; } 40@end 41 42//===------------------------------------------------------------------------=== 43// The next test shows how clang accepted attribute((unused)) on ObjC 44// instance variables, which GCC does not. 45//===------------------------------------------------------------------------=== 46 47#if __has_feature(attribute_objc_ivar_unused) 48#define UNUSED_IVAR __attribute__((unused)) 49#else 50#error __attribute__((unused)) not supported on ivars 51#endif 52 53@interface TestUnusedIvar { 54 id y __attribute__((unused)); // no-warning 55 id x UNUSED_IVAR; // no-warning 56} 57@end 58 59static NSString *x = @"hi"; // expected-warning {{unused variable 'x'}} 60 61@interface TestTransitiveUnused 62- (void) a __attribute__((unused)); 63- (void) b __attribute__((unused)); 64@end 65 66@interface TestTransitiveUnused(CAT) 67@end 68 69@implementation TestTransitiveUnused(CAT) 70- (void) b {} 71- (void) a { [self b]; } 72@end 73 74// Test that objc_precise_lifetime suppresses 75// unused variable warnings. 76extern void rdar15596883_foo(void); 77void rdar15596883(id x) { 78 __attribute__((objc_precise_lifetime)) id y = x; // no-warning 79 rdar15596883_foo(); 80} 81 82@interface PropertyObject : NSObject 83@property int length; 84@end 85 86@protocol P 87@property int property; 88@end 89 90void test3(PropertyObject *o) 91{ 92 [o length]; // No warning. property name used in direct method call. 93} 94 95void test4(id o) 96{ 97 [o length]; // No warning. 98} 99 100void test5(id <P> p) 101{ 102 [p property]; // No warning. property name used in direct method call. 103} 104 105@interface Model 106@property (nonatomic, retain, setter=setOrCreateGroup:, getter=getOrCreateGroup) id group; 107@end 108 109@implementation Model { 110 id _group; 111} 112- (void)method { 113 [self getOrCreateGroup]; 114 self.getOrCreateGroup; // expected-warning {{property access result unused - getters should not be used for side effects}} 115 self.group; // expected-warning {{property access result unused - getters should not be used for side effects}} 116 self.group = (void*)0; 117 [self setOrCreateGroup : ((void*)0)]; 118 119} 120- (id)getOrCreateGroup { 121 if (!_group) { 122 _group = @"group"; 123 } 124 return _group; 125} 126@end 127 128