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
| // RUN: %clang_analyze_cc1 -std=c++11 -analyzer-checker=core,cplusplus,unix.Malloc,debug.ExprInspection -analyzer-config eagerly-assume=false %s -verify -analyzer-output=text
extern "C" char *strdup(const char* s);
extern "C" void free(void* ptr);
namespace std {
template<class T> struct remove_reference { typedef T type; };
template<class T> struct remove_reference<T&> { typedef T type; };
template<class T> struct remove_reference<T&&> { typedef T type; };
template<class T> typename remove_reference<T>::type&& move(T&& t);
}
void clang_analyzer_eval(int);
class StringUsed {
public:
StringUsed(const char *s = "") : str(strdup(s)) {}
StringUsed(const StringUsed &rhs) : str(strdup(rhs.str)) {}
~StringUsed();
StringUsed& operator=(const StringUsed &rhs);
StringUsed& operator=(StringUsed &&rhs);
operator const char*() const;
private:
char *str;
};
StringUsed::~StringUsed() {
free(str);
}
StringUsed& StringUsed::operator=(const StringUsed &rhs) { // expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs != *this}}
clang_analyzer_eval(*this == rhs); // expected-warning{{TRUE}} expected-warning{{UNKNOWN}} expected-note{{TRUE}} expected-note{{UNKNOWN}}
free(str); // expected-note{{Memory is released}}
str = strdup(rhs.str); // expected-warning{{Use of memory after it is freed}} expected-note{{Use of memory after it is freed}}
// expected-note@-1{{Memory is allocated}}
return *this;
}
StringUsed& StringUsed::operator=(StringUsed &&rhs) { // expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs != *this}}
clang_analyzer_eval(*this == rhs); // expected-warning{{TRUE}} expected-warning{{UNKNOWN}} expected-note{{TRUE}} expected-note{{UNKNOWN}}
str = rhs.str;
rhs.str = nullptr; // expected-warning{{Potential memory leak}} expected-note{{Potential memory leak}}
return *this;
}
StringUsed::operator const char*() const {
return str;
}
class StringUnused {
public:
StringUnused(const char *s = "") : str(strdup(s)) {}
StringUnused(const StringUnused &rhs) : str(strdup(rhs.str)) {}
~StringUnused();
StringUnused& operator=(const StringUnused &rhs);
StringUnused& operator=(StringUnused &&rhs);
operator const char*() const;
private:
char *str;
};
StringUnused::~StringUnused() {
free(str);
}
StringUnused& StringUnused::operator=(const StringUnused &rhs) { // expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs != *this}}
clang_analyzer_eval(*this == rhs); // expected-warning{{TRUE}} expected-warning{{UNKNOWN}} expected-note{{TRUE}} expected-note{{UNKNOWN}}
free(str); // expected-note{{Memory is released}}
str = strdup(rhs.str); // expected-warning{{Use of memory after it is freed}} expected-note{{Use of memory after it is freed}}
return *this;
}
StringUnused& StringUnused::operator=(StringUnused &&rhs) { // expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs != *this}}
clang_analyzer_eval(*this == rhs); // expected-warning{{TRUE}} expected-warning{{UNKNOWN}} expected-note{{TRUE}} expected-note{{UNKNOWN}}
str = rhs.str;
rhs.str = nullptr; // FIXME: An improved leak checker should warn here
return *this;
}
StringUnused::operator const char*() const {
return str;
}
int main() {
StringUsed s1 ("test"), s2;
s2 = s1; // expected-note{{Calling copy assignment operator for 'StringUsed'}} // expected-note{{Returned allocated memory}}
s2 = std::move(s1); // expected-note{{Calling move assignment operator for 'StringUsed'}}
return 0;
}
|