reference, declarationdefinition
definition → references, declarations, derived classes, virtual overrides
reference to multiple definitions → definitions
unreferenced
    1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100
  101
  102
  103
  104
  105
  106
  107
  108
  109
  110
  111
  112
  113
  114
  115
  116
  117
  118
  119
  120
  121
  122
  123
  124
  125
  126
  127
  128
  129
  130
  131
  132
  133
  134
  135
  136
  137
  138
  139
  140
  141
  142
  143
  144
  145
  146
  147
  148
  149
  150
  151
  152
  153
  154
  155
  156
  157
  158
  159
  160
  161
  162
  163
  164
  165
  166
  167
  168
  169
  170
  171
  172
  173
  174
  175
  176
  177
  178
  179
  180
  181
  182
  183
  184
  185
  186
  187
  188
  189
  190
  191
  192
  193
  194
  195
  196
  197
  198
  199
  200
  201
  202
  203
  204
  205
  206
  207
  208
  209
  210
  211
  212
  213
  214
  215
  216
  217
  218
  219
  220
  221
  222
  223
  224
  225
  226
  227
  228
  229
  230
  231
  232
  233
  234
  235
  236
  237
  238
  239
  240
  241
  242
  243
  244
  245
  246
  247
  248
  249
  250
  251
  252
  253
  254
  255
  256
  257
  258
  259
  260
  261
  262
  263
  264
  265
  266
  267
  268
  269
  270
  271
  272
  273
  274
  275
  276
  277
  278
  279
  280
  281
  282
  283
  284
  285
  286
  287
  288
  289
  290
  291
  292
  293
  294
  295
  296
  297
  298
  299
  300
  301
  302
  303
  304
  305
  306
  307
  308
  309
  310
  311
// RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection -analyzer-config ipa=dynamic-bifurcate -verify -analyzer-config eagerly-assume=false %s

void clang_analyzer_checkInlined(int);
void clang_analyzer_eval(int);

// Test inlining of ObjC class methods.

typedef signed char BOOL;
typedef struct objc_class *Class;
typedef struct objc_object {
    Class isa;
} *id;
@protocol NSObject  - (BOOL)isEqual:(id)object; @end
@interface NSObject <NSObject> {}
+(id)alloc;
-(id)init;
-(id)autorelease;
-(id)copy;
- (Class)class;
-(id)retain;
@end

// Vanila: ObjC class method is called by name.
@interface MyParent : NSObject
+ (int)getInt;
@end
@interface MyClass : MyParent
+ (int)getInt;
@end
@implementation MyClass
+ (int)testClassMethodByName {
    int y = [MyClass getInt];
    return 5/y; // expected-warning {{Division by zero}}
}
+ (int)getInt {
  return 0;
}
@end

// The definition is defined by the parent. Make sure we find it and inline.
@interface MyParentDIP : NSObject
+ (int)getInt;
@end
@interface MyClassDIP : MyParentDIP
@end
@implementation MyClassDIP
+ (int)testClassMethodByName {
    int y = [MyClassDIP getInt];
    return 5/y; // expected-warning {{Division by zero}}
}
@end
@implementation MyParentDIP
+ (int)getInt {
    return 0;
}
@end

// ObjC class method is called by name. Definition is in the category.
@interface AAA : NSObject
@end
@interface AAA (MyCat)
+ (int)getInt;
@end
int foo() {
    int y = [AAA getInt];
    return 5/y; // expected-warning {{Division by zero}}
}
@implementation AAA
@end
@implementation AAA (MyCat)
+ (int)getInt {
    return 0;
}
@end

// ObjC class method is called by name. Definition is in the parent category.
@interface PPP : NSObject
@end
@interface PPP (MyCat)
+ (int)getInt;
@end
@interface CCC : PPP
@end
int foo4() {
    int y = [CCC getInt];
    return 5/y; // expected-warning {{Division by zero}}
}
@implementation PPP
@end
@implementation PPP (MyCat)
+ (int)getInt {
    return 0;
}
@end

// There is no declaration in the class but there is one in the parent. Make 
// sure we pick the definition from the class and not the parent.
@interface MyParentTricky : NSObject
+ (int)getInt;
@end
@interface MyClassTricky : MyParentTricky
@end
@implementation MyParentTricky
+ (int)getInt {
    return 0;
}
@end
@implementation MyClassTricky
+ (int)getInt {
  return 1;
}
+ (int)testClassMethodByName {
    int y = [MyClassTricky getInt];
    return 5/y; // no-warning
}
@end

// ObjC class method is called by unknown class declaration (passed in as a 
// parameter). We should not inline in such case.
@interface MyParentUnknown : NSObject
+ (int)getInt;
@end
@interface MyClassUnknown : MyParentUnknown
+ (int)getInt;
@end
@implementation MyClassUnknown
+ (int)testClassVariableByUnknownVarDecl: (Class)cl  {
  int y = [cl getInt];
  return 3/y; // no-warning
}
+ (int)getInt {
  return 0;
}
@end


// False negative.
// ObjC class method call through a decl with a known type.
// We should be able to track the type of currentClass and inline this call.
// Note, [self class] could be a subclass. Do we still want to inline here?
@interface MyClassKT : NSObject
@end
@interface MyClassKT (MyCatKT)
+ (int)getInt;
@end
@implementation MyClassKT (MyCatKT)
+ (int)getInt {
    return 0;
}
@end
@implementation MyClassKT
- (int)testClassMethodByKnownVarDecl {
  Class currentClass = [self class];
  int y = [currentClass getInt];
  return 5/y; // Would be great to get a warning here.
}
@end

// Another false negative due to us not reasoning about self, which in this 
// case points to the object of the class in the call site and should be equal 
// to [MyParent class].
@interface MyParentSelf : NSObject
+ (int)testSelf;
@end
@implementation MyParentSelf
+ (int)testSelf {
  if (self == [MyParentSelf class])
      return 0;
    else
      return 1;
}
@end
@interface MyClassSelf : MyParentSelf
@end
@implementation MyClassSelf
+ (int)testClassMethodByKnownVarDecl {
  int y = [MyParentSelf testSelf];
  return 5/y; // expected-warning{{Division by zero}}
}
@end
int foo2() {
  int y = [MyParentSelf testSelf];
  return 5/y; // expected-warning{{Division by zero}}
}

// TODO: We do not inline 'getNum' in the following case, where the value of 
// 'self' in call '[self getNum]' is available and evaualtes to 
// 'SelfUsedInParentChild' if it's called from fooA.
// Self region should get created before we call foo and yje call to super 
// should keep it live. 
@interface SelfUsedInParent : NSObject
+ (int)getNum;
+ (int)foo;
@end
@implementation SelfUsedInParent
+ (int)getNum {return 5;}
+ (int)foo {
  int r = [self getNum];
  clang_analyzer_eval(r == 5); // expected-warning{{TRUE}}
  return r;
}
@end
@interface SelfUsedInParentChild : SelfUsedInParent
+ (int)getNum;
+ (int)fooA;
@end
@implementation SelfUsedInParentChild
+ (int)getNum {return 0;}
+ (int)fooA {
  return [super foo];
}
@end
int checkSelfUsedInparentClassMethod() {
    return 5/[SelfUsedInParentChild fooA];
}


@interface Rdar15037033 : NSObject
@end

void rdar15037033() {
  [Rdar15037033 forwardDeclaredMethod]; // expected-warning {{class method '+forwardDeclaredMethod' not found}}
  [Rdar15037033 forwardDeclaredVariadicMethod:1, 2, 3, 0]; // expected-warning {{class method '+forwardDeclaredVariadicMethod:' not found}}
}

@implementation Rdar15037033

+ (void)forwardDeclaredMethod {
  clang_analyzer_checkInlined(1); // expected-warning{{TRUE}}
}

+ (void)forwardDeclaredVariadicMethod:(int)x, ... {
  clang_analyzer_checkInlined(0); // no-warning
}
@end

@interface SelfClassTestParent : NSObject
-(unsigned)returns10;
+(unsigned)returns20;
+(unsigned)returns30;
@end

@implementation SelfClassTestParent
-(unsigned)returns10 { return 100; }
+(unsigned)returns20 { return 100; }
+(unsigned)returns30 { return 100; }
@end

@interface SelfClassTest : SelfClassTestParent
-(unsigned)returns10;
+(unsigned)returns20;
+(unsigned)returns30;
@end

@implementation SelfClassTest
-(unsigned)returns10 { return 10; }
+(unsigned)returns20 { return 20; }
+(unsigned)returns30 { return 30; }
+(void)classMethod {
  unsigned result1 = [self returns20];
  clang_analyzer_eval(result1 == 20); // expected-warning{{TRUE}}
  unsigned result2 = [[self class] returns30];
  clang_analyzer_eval(result2 == 30); // expected-warning{{TRUE}}
  unsigned result3 = [[super class] returns30];
  clang_analyzer_eval(result3 == 100); // expected-warning{{UNKNOWN}}
}
-(void)instanceMethod {
  unsigned result0 = [self returns10];
  clang_analyzer_eval(result0 == 10); // expected-warning{{TRUE}}
  unsigned result2 = [[self class] returns30];
  clang_analyzer_eval(result2 == 30); // expected-warning{{TRUE}}
  unsigned result3 = [[super class] returns30];
  clang_analyzer_eval(result3 == 100); // expected-warning{{UNKNOWN}}
}
@end

@interface Parent : NSObject
+ (int)a;
+ (int)b;
@end
@interface Child : Parent
@end
@interface Other : NSObject
+(void)run;
@end
int main(int argc, const char * argv[]) {
  @autoreleasepool {
    [Other run];
  }
  return 0;
}
@implementation Other
+(void)run {
  int result = [Child a];
  // TODO: This should return 100.
  clang_analyzer_eval(result == 12); // expected-warning{{TRUE}}
}
@end
@implementation Parent
+ (int)a; {
  return [self b];
}
+ (int)b; {
  return 12;
}
@end
@implementation Child
+ (int)b; {
  return 100;
}
@end