1 // RUN: %clang_cc1 -analyze -analyzer-checker=core,alpha.core,debug.ExprInspection,unix.Malloc,unix.cstring,alpha.unix.cstring,unix.API,osx.API,osx.cocoa.RetainCount -Wno-null-dereference -analyzer-store=region -fblocks -verify %s
2 #define NULL 0
3 void clang_analyzer_eval(int);
4 void myFunc();
5 void myWeakFunc() __attribute__((weak_import));
6 
7 void testWeakFuncIsNull()
8 {
9   clang_analyzer_eval(myFunc == NULL);  // expected-warning{{FALSE}}
10   clang_analyzer_eval(myWeakFunc == NULL);  // expected-warning{{UNKNOWN}}
11   if (myWeakFunc == NULL) {
12     clang_analyzer_eval(myWeakFunc == NULL);  // expected-warning{{TRUE}}
13   } else {
14     clang_analyzer_eval(myWeakFunc == NULL);  // expected-warning{{FALSE}}
15   }
16 }
17 
18 void testWeakFuncIsNot()
19 {
20   clang_analyzer_eval(myWeakFunc == NULL);  // expected-warning{{UNKNOWN}}
21   if (!myWeakFunc) {
22     clang_analyzer_eval(myWeakFunc == NULL);  // expected-warning{{TRUE}}
23   } else {
24     clang_analyzer_eval(myWeakFunc == NULL);  // expected-warning{{FALSE}}
25   }
26 }
27 
28 void testWeakFuncIsTrue()
29 {
30     clang_analyzer_eval(myWeakFunc == NULL);  // expected-warning{{UNKNOWN}}
31     if (myWeakFunc) {
32         clang_analyzer_eval(myWeakFunc == NULL);  // expected-warning{{FALSE}}
33     } else {
34         clang_analyzer_eval(myWeakFunc == NULL);  // expected-warning{{TRUE}}
35     }
36 }
37 
38 //===----------------------------------------------------------------------===
39 // func.c
40 //===----------------------------------------------------------------------===
41 void f(void) __attribute__((weak_import));
42 void g(void (*fp)(void)) __attribute__((weak_import));
43 
44 void f(void) {
45   void (*p)(void);
46   p = f;
47   p = &f;
48   p();
49   (*p)();
50 }
51 
52 void g(void (*fp)(void));
53 
54 void f2() {
55   g(f);
56 }
57 
58 void f3(void (*f)(void), void (*g)(void)) {
59   clang_analyzer_eval(!f); // expected-warning{{UNKNOWN}}
60   f();
61   clang_analyzer_eval(!f); // expected-warning{{FALSE}}
62 
63   clang_analyzer_eval(!g); // expected-warning{{UNKNOWN}}
64   (*g)();
65   clang_analyzer_eval(!g); // expected-warning{{FALSE}}
66 }
67 
68 //===----------------------------------------------------------------------===
69 // free.c
70 //===----------------------------------------------------------------------===
71 void free(void *) __attribute__((weak_import));
72 
73 void t10 () {
74   free((void*)&t10); // expected-warning {{Argument to free() is the address of the function 't10', which is not memory allocated by malloc()}}
75 }
76 
77 //===----------------------------------------------------------------------===
78 // string.c : strnlen()
79 //===----------------------------------------------------------------------===
80 typedef typeof(sizeof(int)) size_t;
81 size_t strlen(const char *s) __attribute__((weak_import));
82 
83 size_t strlen_fn() {
84   return strlen((char*)&strlen_fn); // expected-warning{{Argument to string length function is the address of the function 'strlen_fn', which is not a null-terminated string}}
85 }
86 
87 //===----------------------------------------------------------------------===
88 // unix-fns.c : dispatch_once
89 //===----------------------------------------------------------------------===
90 typedef void (^dispatch_block_t)(void);
91 typedef long dispatch_once_t;
92 void dispatch_once(dispatch_once_t *predicate, dispatch_block_t block) __attribute__((weak_import));
93 
94 void test_dispatch_once() {
95   dispatch_once_t pred = 0;
96   do { if (__builtin_expect(*(&pred), ~0l) != ~0l) dispatch_once((&pred), (^() {})); } while (0); // expected-warning{{Call to 'dispatch_once' uses the local variable 'pred' for the predicate value}}
97 }
98 void test_dispatch_once_neg() {
99   static dispatch_once_t pred = 0;
100   do { if (__builtin_expect(*(&pred), ~0l) != ~0l) dispatch_once((&pred), (^() {})); } while (0); // no-warning
101 }
102 
103 //===----------------------------------------------------------------------===
104 // retain-release-path-notes.m
105 //===----------------------------------------------------------------------===
106 typedef struct CFType *CFTypeRef;
107 CFTypeRef CFCreateSomething() __attribute__((weak_import));
108 CFTypeRef CFGetSomething() __attribute__((weak_import));
109 
110 CFTypeRef CFCopyRuleViolation () {
111   CFTypeRef object = CFGetSomething();
112   return object; // expected-warning{{Object with a +0 retain count returned to caller where a +1 (owning) retain count is expected}}
113 }
114 
115 CFTypeRef CFGetRuleViolation () {
116   CFTypeRef object = CFCreateSomething(); // expected-warning{{Potential leak of an object stored into 'object'}}
117   return object; }
118