InlineObjCInstanceMethod.m revision d51db4935736fd943bfd46dfa74d41e9a3c2d41f 
1// RUN: %clang --analyze -Xanalyzer -analyzer-checker=osx.cocoa.IncompatibleMethodTypes,osx.coreFoundation.CFRetainRelease -Xclang -verify %s
2
3#include "InlineObjCInstanceMethod.h"
4
5typedef const struct __CFString * CFStringRef;
6typedef const void * CFTypeRef;
7extern CFTypeRef CFRetain(CFTypeRef cf);
8extern void CFRelease(CFTypeRef cf);
9extern CFStringRef getString(void);
10
11// Method is defined in the parent; called through self.
12@interface MyParent : NSObject
13- (int)getInt;
14- (const struct __CFString *) testCovariantReturnType __attribute__((cf_returns_retained));
15@end
16@implementation MyParent
17- (int)getInt {
18    return 0;
19}
20
21- (CFStringRef) testCovariantReturnType __attribute__((cf_returns_retained)) {
22  CFStringRef Str = ((void*)0);
23  Str = getString();
24  if (Str) {
25    CFRetain(Str);
26  }
27  return Str;
28}
29
30@end
31
32@interface MyClass : MyParent
33@end
34@implementation MyClass
35- (int)testDynDispatchSelf {
36  int y = [self getInt];
37  return 5/y; // expected-warning {{Division by zero}}
38}
39
40// Get the dynamic type info from a cast (from id to MyClass*).
41+ (int)testAllocInit {
42  MyClass *a = [[self alloc] init];
43  return 5/[a getInt]; // expected-warning {{Division by zero}}
44}
45
46// Method is called on inited object.
47+ (int)testAllocInit2 {
48  MyClass *a = [[MyClass alloc] init];
49  return 5/[a getInt]; // expected-warning {{Division by zero}}
50}
51
52// Method is called on a parameter.
53+ (int)testParam: (MyClass*) a {
54  return 5/[a getInt]; // expected-warning {{Division by zero}}
55}
56
57// Method is called on a parameter of unnown type.
58+ (int)testParamUnknownType: (id) a {
59  return 5/[a getInt]; // no warning
60}
61
62@end
63
64// TODO: When method is inlined, the attribute reset should be visible.
65@interface TestSettingAnAttributeInCallee : NSObject {
66  int _attribute;
67}
68  - (void) method2;
69@end
70
71@implementation TestSettingAnAttributeInCallee
72- (int) method1 {
73  [self method2];
74  return 5/_attribute; // expected-warning {{Division by zero}}
75}
76
77- (void) method2 {
78  _attribute = 0;
79}
80@end
81
82@interface TestSettingAnAttributeInCaller : NSObject {
83  int _attribute;
84}
85  - (int) method2;
86@end
87
88@implementation TestSettingAnAttributeInCaller
89- (void) method1 {
90  _attribute = 0;
91  [self method2];
92}
93
94- (int) method2 {
95  return 5/_attribute; // expected-warning {{Division by zero}}
96}
97@end
98
99
100// Don't crash if we don't know the receiver's region.
101void randomlyMessageAnObject(MyClass *arr[], int i) {
102  (void)[arr[i] getInt];
103}
104
105
106@interface EvilChild : MyParent
107- (id)getInt;
108- (const struct __CFString *) testCovariantReturnType __attribute__((cf_returns_retained));
109@end
110
111@implementation EvilChild
112- (id)getInt { // expected-warning {{types are incompatible}}
113  return self;
114}
115- (CFStringRef) testCovariantReturnType __attribute__((cf_returns_retained)) {
116  CFStringRef Str = ((void*)0);
117  Str = getString();
118  if (Str) {
119    CFRetain(Str);
120  }
121  return Str;
122}
123
124@end
125
126int testNonCovariantReturnType() {
127  MyParent *obj = [[EvilChild alloc] init];
128
129  // Devirtualization allows us to directly call -[EvilChild getInt], but
130  // that returns an id, not an int. There is an off-by-default warning for
131  // this, -Woverriding-method-mismatch, and an on-by-default analyzer warning,
132  // osx.cocoa.IncompatibleMethodTypes. This code would probably crash at
133  // runtime, but at least the analyzer shouldn't crash.
134  int x = 1 + [obj getInt];
135
136  [obj release];
137  return 5/(x-1); // no-warning
138}
139
140int testCovariantReturnTypeNoErrorSinceTypesMatch() {
141  MyParent *obj = [[EvilChild alloc] init];
142
143  CFStringRef S = ((void*)0);
144  S = [obj testCovariantReturnType];
145  if (S)
146    CFRelease(S);
147  CFRelease(obj);
148}
149