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 3 int 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 13 int test1(void) { 14 [Greeter hello]; 15 return 0; 16 } 17 18 @interface NSObject @end 19 @interface NSString : NSObject 20 - (int)length; 21 @end 22 23 void test2() { 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 {{unused}} 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 59 // rdar://10777111 60 static NSString *x = @"hi"; // expected-warning {{unused variable 'x'}} 61 62 // rdar://12233989 63 @interface TestTransitiveUnused 64 - (void) a __attribute__((unused)); 65 - (void) b __attribute__((unused)); 66 @end 67 68 @interface TestTransitiveUnused(CAT) 69 @end 70 71 @implementation TestTransitiveUnused(CAT) 72 - (void) b {} 73 - (void) a { [self b]; } 74 @end 75 76 // Test that objc_precise_lifetime suppresses 77 // unused variable warnings. 78 extern void rdar15596883_foo(void); 79 void rdar15596883(id x) { 80 __attribute__((objc_precise_lifetime)) id y = x; // no-warning 81 rdar15596883_foo(); 82 } 83 84 @interface PropertyObject : NSObject 85 @property int length; 86 @end 87 88 @protocol P 89 @property int property; 90 @end 91 92 void test3(PropertyObject *o) 93 { 94 [o length]; // No warning. property name used in direct method call. 95 } 96 97 void test4(id o) 98 { 99 [o length]; // No warning. 100 } 101 102 void test5(id <P> p) 103 { 104 [p property]; // No warning. property name used in direct method call. 105 } 106 107 // rdar://19773512 108 @interface Model 109 @property (nonatomic, retain, setter=setOrCreateGroup:, getter=getOrCreateGroup) id group; 110 @end 111 112 @implementation Model { 113 id _group; 114 } 115 - (void)method { 116 [self getOrCreateGroup]; 117 self.getOrCreateGroup; // expected-warning {{property access result unused - getters should not be used for side effects}} 118 self.group; // expected-warning {{property access result unused - getters should not be used for side effects}} 119 self.group = (void*)0; 120 [self setOrCreateGroup : ((void*)0)]; 121 122 } 123 - (id)getOrCreateGroup { 124 if (!_group) { 125 _group = @"group"; 126 } 127 return _group; 128 } 129 @end 130 131
