forked from OSchip/llvm-project
91 lines
3.5 KiB
C++
91 lines
3.5 KiB
C++
// 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
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extern "C" char *strdup(const char* s);
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extern "C" void free(void* ptr);
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namespace std {
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template<class T> struct remove_reference { typedef T type; };
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template<class T> struct remove_reference<T&> { typedef T type; };
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template<class T> struct remove_reference<T&&> { typedef T type; };
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template<class T> typename remove_reference<T>::type&& move(T&& t);
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}
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void clang_analyzer_eval(int);
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class StringUsed {
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public:
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StringUsed(const char *s = "") : str(strdup(s)) {}
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StringUsed(const StringUsed &rhs) : str(strdup(rhs.str)) {}
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~StringUsed();
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StringUsed& operator=(const StringUsed &rhs);
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StringUsed& operator=(StringUsed &&rhs);
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operator const char*() const;
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private:
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char *str;
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};
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StringUsed::~StringUsed() {
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free(str);
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}
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StringUsed& StringUsed::operator=(const StringUsed &rhs) { // expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs != *this}}
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clang_analyzer_eval(*this == rhs); // expected-warning{{TRUE}} expected-warning{{UNKNOWN}} expected-note{{TRUE}} expected-note{{UNKNOWN}}
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free(str); // expected-note{{Memory is released}}
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str = strdup(rhs.str); // expected-warning{{Use of memory after it is freed}} expected-note{{Use of memory after it is freed}}
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// expected-note@-1{{Memory is allocated}}
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return *this;
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}
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StringUsed& StringUsed::operator=(StringUsed &&rhs) { // expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs != *this}}
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clang_analyzer_eval(*this == rhs); // expected-warning{{TRUE}} expected-warning{{UNKNOWN}} expected-note{{TRUE}} expected-note{{UNKNOWN}}
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str = rhs.str;
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rhs.str = nullptr; // expected-warning{{Potential memory leak}} expected-note{{Potential memory leak}}
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return *this;
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}
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StringUsed::operator const char*() const {
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return str;
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}
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class StringUnused {
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public:
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StringUnused(const char *s = "") : str(strdup(s)) {}
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StringUnused(const StringUnused &rhs) : str(strdup(rhs.str)) {}
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~StringUnused();
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StringUnused& operator=(const StringUnused &rhs);
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StringUnused& operator=(StringUnused &&rhs);
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operator const char*() const;
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private:
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char *str;
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};
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StringUnused::~StringUnused() {
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free(str);
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}
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StringUnused& StringUnused::operator=(const StringUnused &rhs) { // expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs != *this}}
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clang_analyzer_eval(*this == rhs); // expected-warning{{TRUE}} expected-warning{{UNKNOWN}} expected-note{{TRUE}} expected-note{{UNKNOWN}}
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free(str); // expected-note{{Memory is released}}
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str = strdup(rhs.str); // expected-warning{{Use of memory after it is freed}} expected-note{{Use of memory after it is freed}}
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return *this;
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}
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StringUnused& StringUnused::operator=(StringUnused &&rhs) { // expected-note{{Assuming rhs == *this}} expected-note{{Assuming rhs != *this}}
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clang_analyzer_eval(*this == rhs); // expected-warning{{TRUE}} expected-warning{{UNKNOWN}} expected-note{{TRUE}} expected-note{{UNKNOWN}}
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str = rhs.str;
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rhs.str = nullptr; // FIXME: An improved leak checker should warn here
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return *this;
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}
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StringUnused::operator const char*() const {
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return str;
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}
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int main() {
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StringUsed s1 ("test"), s2;
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s2 = s1; // expected-note{{Calling copy assignment operator for 'StringUsed'}} // expected-note{{Returned allocated memory}}
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s2 = std::move(s1); // expected-note{{Calling move assignment operator for 'StringUsed'}}
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return 0;
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}
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