TestUnusedFunctions() : TestFixture("TestUnusedFunctions") {}

const Settings settings = settingsBuilder().severity(Severity::style).build();

void run() override {

TEST_CASE(incondition);

TEST_CASE(return1);

TEST_CASE(return2);

TEST_CASE(return3);

TEST_CASE(callback1);

TEST_CASE(callback2);

TEST_CASE(else1);

TEST_CASE(functionpointer);

TEST_CASE(template1);

TEST_CASE(template2);

TEST_CASE(template3);

TEST_CASE(template4); // #9805

TEST_CASE(template5);

TEST_CASE(template6); // #10475 crash

TEST_CASE(template7); // #9766 crash

TEST_CASE(template8);

TEST_CASE(template9);

TEST_CASE(template10);

TEST_CASE(throwIsNotAFunction);

TEST_CASE(unusedError);

TEST_CASE(unusedMain);

TEST_CASE(initializationIsNotAFunction);

TEST_CASE(operator1); // #3195

TEST_CASE(operator2); // #7974

TEST_CASE(returnRef);

TEST_CASE(attribute); // #3471 - FP __attribute__(constructor)

TEST_CASE(initializer_list);

TEST_CASE(member_function_ternary);

TEST_CASE(boost);

TEST_CASE(enumValues);

TEST_CASE(recursive);

TEST_CASE(multipleFiles); // same function name in multiple files

TEST_CASE(lineNumber); // Ticket 3059

TEST_CASE(ignore_declaration); // ignore declaration

TEST_CASE(operatorOverload);

TEST_CASE(entrypointsWin);

TEST_CASE(entrypointsWinU);

TEST_CASE(entrypointsUnix);

TEST_CASE(includes);

TEST_CASE(virtualFunc);

TEST_CASE(parensInit);

TEST_CASE(typeInCast);

TEST_CASE(attributeCleanup);

}

#define check(...) check_(__FILE__, __LINE__, __VA_ARGS__)

template<size_t size>

void check_(const char* file, int line, const char (&code)[size], Platform::Type platform = Platform::Type::Native, const Settings *s = nullptr) {

const Settings settings1 = settingsBuilder(s ? *s : settings).platform(platform).build();

// Tokenize..

SimpleTokenizer tokenizer(settings1, *this);

ASSERT_LOC(tokenizer.tokenize(code), file, line);

// Check for unused functions..

CheckUnusedFunctions checkUnusedFunctions;

checkUnusedFunctions.parseTokens(tokenizer, settings1);

(checkUnusedFunctions.check)(settings1, *this); // TODO: check result

}

// TODO: get rid of this

void check_(const char* file, int line, const std::string& code ) {

// Tokenize..

SimpleTokenizer tokenizer(settings, *this);

ASSERT_LOC(tokenizer.tokenize(code), file, line);

// Check for unused functions..

CheckUnusedFunctions checkUnusedFunctions;

checkUnusedFunctions.parseTokens(tokenizer, settings);

(checkUnusedFunctions.check)(settings, *this); // TODO: check result

}

void incondition() {

check("int f1()\n"

"{\n"

" if (f1())\n"

" { }\n"

"}");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'f1' is never used.\n", errout_str());

}

void return1() {

check("int f1()\n"

"{\n"

" return f1();\n"

"}");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'f1' is never used.\n", errout_str());

}

void return2() {

check("char * foo()\n"

"{\n"

" return foo();\n"

"}");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout_str());

}

void return3() {

check("typedef void (*VoidFunc)();\n" // #9602

"void sayHello() {\n"

" printf(\"Hello World\\n\");\n"

"}\n"

"VoidFunc getEventHandler() {\n"

" return sayHello;\n"

"}\n"

"void indirectHello() {\n"

" VoidFunc handler = getEventHandler();\n"

" handler();\n"

"}\n"

"int main() {\n"

" indirectHello();\n"

"}");

ASSERT_EQUALS("", errout_str());

}

void callback1() {

check("void f1()\n"

"{\n"

" void (*f)() = cond ? f1 : NULL;\n"

"}");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'f1' is never used.\n", errout_str());

}

void callback2() { // #8677

check("class C {\n"

"public:\n"

" void callback();\n"

" void start();\n"

"};\n"

"\n"

"void C::callback() {}\n" // <- not unused

"\n"

"void C::start() { ev.set<C, &C::callback>(this); }");

ASSERT_EQUALS("[test.cpp:9]: (style) The function 'start' is never used.\n", errout_str());

}

void else1() {

check("void f1()\n"

"{\n"

" if (cond) ;\n"

" else f1();\n"

"}");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'f1' is never used.\n", errout_str());

}

void functionpointer() {

check("void foo() { }\n"

"int main() {\n"

" f(&foo);\n"

" return 0\n"

"}");

ASSERT_EQUALS("", errout_str());

check("void foo() { }\n"

"int main() {\n"

" f(&::foo);\n"

" return 0\n"

"}");

ASSERT_EQUALS("", errout_str());

check("namespace abc {\n"

" void foo() { }\n"

"};\n"

"int main() {\n"

" f(&abc::foo);\n"

" return 0\n"

"}");

ASSERT_EQUALS("", errout_str());

check("namespace abc {\n"

" void foo() { }\n"

"};\n"

"int main() {\n"

" f = &abc::foo;\n"

" return 0\n"

"}");

ASSERT_EQUALS("", errout_str());

check("namespace abc {\n"

" void foo() { }\n"

"};\n"

"int main() {\n"

" f = &::abc::foo;\n"

" return 0\n"

"}");

ASSERT_EQUALS("", errout_str());

check("namespace abc {\n" // #3875

" void foo() { }\n"

"};\n"

"int main() {\n"

" f(abc::foo);\n"

" return 0\n"

"}");

ASSERT_EQUALS("", errout_str());

check("template <class T> T f()\n" // #13117

"{\n"

" return T(1);\n"

"}\n"

"int main(void)\n"

"{\n"

" auto *ptr = &f<int>;\n"

" return ptr();\n"

"}\n");

ASSERT_EQUALS("", errout_str());

}

void template1() {

check("template<class T> void foo() { }\n"

"\n"

"int main()\n"

"{\n"

" foo<int>();\n"

" return 0\n"

"}");

ASSERT_EQUALS("", errout_str());

}

void template2() {

check("void f() { }\n"

"\n"

"template<class T> void g()\n"

"{\n"

" f();\n"

"}\n"

"\n"

"void h() { g<int>(); h(); }");

ASSERT_EQUALS("[test.cpp:8]: (style) The function 'h' is never used.\n", errout_str());

}

void template3() { // #4701

check("class X {\n"

"public:\n"

" void bar() { foo<int>(0); }\n"

"private:\n"

" template<typename T> void foo( T t ) const;\n"

"};\n"

"template<typename T> void X::foo( T t ) const { }");

ASSERT_EQUALS("[test.cpp:3]: (style) The function 'bar' is never used.\n", errout_str());

}

void template4() { // #9805

check("struct A {\n"

" int a = 0;\n"

" void f() { a = 1; }\n"

" template <typename T, typename... Args> auto call(const Args &... args) -> T {\n"

" a = 2;\n"

" return T{};\n"

" }\n"

"};\n"

"\n"

"struct B : public A {\n"

" void test() {\n"

" f();\n"

" call<int>(1, 2, 3);\n"

" test();\n"

" }\n"

"};");

ASSERT_EQUALS("[test.cpp:11]: (style) The function 'test' is never used.\n", errout_str());

}

void template5() { // #9220

check("void f(){}\n"

"\n"

"typedef void(*Filter)();\n"

"\n"

"template <Filter fun>\n"

"void g() { fun(); }\n"

"\n"

"int main() { g<f>(); return 0;}");

ASSERT_EQUALS("", errout_str());

}

void template6() { // #10475

check("template<template<typename...> class Ref, typename... Args>\n"

"struct Foo<Ref<Args...>, Ref> : std::true_type {};\n");

ASSERT_EQUALS("", errout_str());

}

void template7()

{ // #9766

check("void f() {\n"

" std::array<std::array<double,3>,3> array;\n"

"}\n");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'f' is never used.\n", errout_str());

}

void template8() { // #11485

check("struct S {\n"

" template<typename T>\n"

" void tf(const T&) { }\n"

"};\n");

ASSERT_EQUALS("[test.cpp:3]: (style) The function 'tf' is never used.\n", errout_str());

check("struct C {\n"

" template<typename T>\n"

" void tf(const T&) { }\n"

"};\n"

"int main() {\n"

" C c;\n"

" c.tf(1.5);\n"

"}\n");

ASSERT_EQUALS("", errout_str());

check("struct C {\n"

" template<typename T>\n"

" void tf(const T&) { }\n"

"};\n"

"int main() {\n"

" C c;\n"

" c.tf<int>(1);\n"

"}\n");

ASSERT_EQUALS("", errout_str());

}

void template9() {

check("template<class T>\n" // #7739

"void f(T const& t) {}\n"

"template<class T>\n"

"void g(T const& t) {\n"

" f(t);\n"

"}\n"

"template<>\n"

"void f<double>(double const& d) {}\n"

"int main() {\n"

" g(2);\n"

" g(3.14);\n"

"}\n");

ASSERT_EQUALS("", errout_str());

check("template <typename T> T f(T);\n" // #9222

"template <typename T> T f(T i) { return i; }\n"

"template int f<int>(int);\n"

"int main() { return f(int(2)); }\n");

ASSERT_EQUALS("", errout_str());

}

void template10() {

check("template<typename T>\n" // #12013, don't crash

"struct S {\n"

" static const int digits = std::numeric_limits<T>::digits;\n"

" using type = std::conditional<digits < 32, std::int32_t, std::int64_t>::type;\n"

"};\n");

ASSERT_EQUALS("", errout_str());

}

void throwIsNotAFunction() {

check("struct A {void f() const throw () {}}; int main() {A a; a.f();}");

ASSERT_EQUALS("", errout_str());

}

void unusedError() {

check("void foo() {}\n"

"int main()");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout_str());

check("void foo() const {}\n"

"int main()");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout_str());

check("void foo() const throw() {}\n"

"int main()");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout_str());

check("void foo() throw() {}\n"

"int main()");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout_str());

}

void unusedMain() {

check("int main() { }");

ASSERT_EQUALS("", errout_str());

}

void initializationIsNotAFunction() {

check("struct B: N::A {\n"

" B(): N::A() {};\n"

"};");

ASSERT_EQUALS("", errout_str());

}

void operator1() {

check("struct Foo { void operator()(int a) {} };");

ASSERT_EQUALS("", errout_str());

check("struct Foo { operator std::string(int a) {} };");

ASSERT_EQUALS("", errout_str());

}

void operator2() { // #7974

check("bool operator==(const data_t& a, const data_t& b) {\n"

" return (a.fd == b.fd);\n"

"}\n"

"bool operator==(const event& a, const event& b) {\n"

" return ((a.events == b.events) && (a.data == b.data));\n"

"}\n"

"int main(event a, event b) {\n"

" return a == b;\n"

"}\n");

ASSERT_EQUALS("", errout_str());

}

void returnRef() {

check("int& foo() {return x;}");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout_str());

}

void attribute() { // #3471 - FP __attribute__((constructor))

check("void __attribute__((constructor)) f() {}");

ASSERT_EQUALS("", errout_str());

check("void __attribute__((constructor(1000))) f() {}");

ASSERT_EQUALS("", errout_str());

check("void __attribute__((destructor)) f() {}");

ASSERT_EQUALS("", errout_str());

check("void __attribute__((destructor(1000))) f() {}");

ASSERT_EQUALS("", errout_str());

// alternate syntax

check("__attribute__((constructor)) void f() {}");

ASSERT_EQUALS("", errout_str());

check("__attribute__((constructor(1000))) void f() {}");

ASSERT_EQUALS("", errout_str());

check("__attribute__((destructor)) void f() {}");

ASSERT_EQUALS("", errout_str());

check("__attribute__((destructor(1000))) void f() {}");

ASSERT_EQUALS("", errout_str());

// alternate syntax

check("void f() __attribute__((constructor));\n"

"void f() { }");

ASSERT_EQUALS("", errout_str());

check("void f() __attribute__((constructor(1000)));\n"

"void f() { }");

ASSERT_EQUALS("", errout_str());

check("void f() __attribute__((destructor));\n"

"void f() { }");

ASSERT_EQUALS("", errout_str());

check("void f() __attribute__((destructor(1000)));\n"

"void f() { }");

ASSERT_EQUALS("", errout_str());

// Don't crash on wrong syntax

check("int x __attribute__((constructor));\n"

"int y __attribute__((destructor));");

// #10661

check("extern \"C\" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t dataSize) { return 0; }\n");

ASSERT_EQUALS("", errout_str());

}

void initializer_list() {

check("int foo() { return 0; }\n"

"struct A {\n"

" A() : m_i(foo())\n"

" {}\n"

"int m_i;\n"

"};");

ASSERT_EQUALS("", errout_str());

// #8580

check("int foo() { return 12345; }\n"

"int bar(std::function<int()> func) { return func(); }\n"

"\n"

"class A {\n"

"public:\n"

" A() : a(bar([] { return foo(); })) {}\n"

" const int a;\n"

"};");

ASSERT_EQUALS("", errout_str());

}

void member_function_ternary() {

check("struct Foo {\n"

" void F1() {}\n"

" void F2() {}\n"

"};\n"

"int main(int argc, char *argv[]) {\n"

" Foo foo;\n"

" void (Foo::*ptr)();\n"

" ptr = (argc > 1 && !strcmp(argv[1], \"F2\")) ? &Foo::F2 : &Foo::F1;\n"

" (foo.*ptr)();\n"

"}");

ASSERT_EQUALS("", errout_str());

}

void boost() {

check("static void _xy(const char *b, const char *e) {}\n"

"void f() {\n"

" parse(line, blanks_p >> ident[&_xy] >> blanks_p >> eol_p).full;\n"

"}\n");

ASSERT_EQUALS("[test.cpp:2]: (style) The function 'f' is never used.\n", errout_str());

}

void enumValues() { // #11486

check("enum E1 { Break1 };\n"

"struct S {\n"

" enum class E { Break };\n"

" void Break() {}\n"

" void Break1() {}\n"

"};\n");

ASSERT_EQUALS("[test.cpp:4]: (style) The function 'Break' is never used.\n"

"[test.cpp:5]: (style) The function 'Break1' is never used.\n",

errout_str());

check("struct S {\n" // #12899

" void f() {}\n"

"};\n"

"enum E { f };\n"

"int main() {\n"

" E e{ f };\n"

"}\n");

ASSERT_EQUALS("[test.cpp:2]: (style) The function 'f' is never used.\n", errout_str());

}

void recursive() {

check("void f() {\n" // #8159

" f();\n"

"}\n");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'f' is never used.\n",

errout_str());

}

void multipleFiles() {

CheckUnusedFunctions c;

const char code[] = "static void f() { }";

for (int i = 1; i <= 2; ++i) {

const std::string fname = "test" + std::to_string(i) + ".cpp";

Tokenizer tokenizer(settings, *this);

std::istringstream istr(code);

ASSERT(tokenizer.list.createTokens(istr, fname));

ASSERT(tokenizer.simplifyTokens1(""));

c.parseTokens(tokenizer, settings);

}

// Check for unused functions..

(c.check)(settings, *this); // TODO: check result

ASSERT_EQUALS("[test1.cpp:1]: (style) The function 'f' is never used.\n", errout_str());

}

void lineNumber() {

check("void foo();\n"

"void bar() {}\n"

"int main() {}");

ASSERT_EQUALS("[test.cpp:2]: (style) The function 'bar' is never used.\n", errout_str());

}

void ignore_declaration() {

check("void f();\n"

"void f() {}");

ASSERT_EQUALS("[test.cpp:2]: (style) The function 'f' is never used.\n", errout_str());

check("void f(void) {}\n"

"void (*list[])(void) = {f};");

ASSERT_EQUALS("", errout_str());

}

void operatorOverload() {

check("class A {\n"

"private:\n"

" friend std::ostream & operator<<(std::ostream &, const A&);\n"

"};\n"

"std::ostream & operator<<(std::ostream &os, const A&) {\n"

" os << \"This is class A\";\n"

"}");

ASSERT_EQUALS("", errout_str());

check("class A{};\n"

"A operator + (const A &, const A &){ return A(); }\n"

"A operator - (const A &, const A &){ return A(); }\n"

"A operator * (const A &, const A &){ return A(); }\n"

"A operator / (const A &, const A &){ return A(); }\n"

"A operator % (const A &, const A &){ return A(); }\n"

"A operator & (const A &, const A &){ return A(); }\n"

"A operator | (const A &, const A &){ return A(); }\n"

"A operator ~ (const A &){ return A(); }\n"

"A operator ! (const A &){ return A(); }\n"

"bool operator < (const A &, const A &){ return true; }\n"

"bool operator > (const A &, const A &){ return true; }\n"

"A operator += (const A &, const A &){ return A(); }\n"

"A operator -= (const A &, const A &){ return A(); }\n"

"A operator *= (const A &, const A &){ return A(); }\n"

"A operator /= (const A &, const A &){ return A(); }\n"

"A operator %= (const A &, const A &){ return A(); }\n"

"A operator &= (const A &, const A &){ return A(); }\n"

"A operator ^= (const A &, const A &){ return A(); }\n"

"A operator |= (const A &, const A &){ return A(); }\n"

"A operator << (const A &, const int){ return A(); }\n"

"A operator >> (const A &, const int){ return A(); }\n"

"A operator <<= (const A &, const int){ return A(); }\n"

"A operator >>= (const A &, const int){ return A(); }\n"

"bool operator == (const A &, const A &){ return true; }\n"

"bool operator != (const A &, const A &){ return true; }\n"

"bool operator <= (const A &, const A &){ return true; }\n"

"bool operator >= (const A &, const A &){ return true; }\n"

"A operator && (const A &, const int){ return A(); }\n"

"A operator || (const A &, const int){ return A(); }\n"

"A operator ++ (const A &, const int){ return A(); }\n"

"A operator ++ (const A &){ return A(); }\n"

"A operator -- (const A &, const int){ return A(); }\n"

"A operator -- (const A &){ return A(); }\n"

"A operator , (const A &, const A &){ return A(); }");

ASSERT_EQUALS("", errout_str());

check("class A {\n"

"public:\n"

" static void * operator new(std::size_t);\n"

" static void * operator new[](std::size_t);\n"

"};\n"

"void * A::operator new(std::size_t s) {\n"

" return malloc(s);\n"

"}\n"

"void * A::operator new[](std::size_t s) {\n"

" return malloc(s);\n"

"}");

ASSERT_EQUALS("", errout_str());

}

void entrypointsWin() {

check("int WinMain() { }");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'WinMain' is never used.\n", errout_str());

check("int _tmain() { }");

ASSERT_EQUALS("[test.cpp:1]: (style) The function '_tmain' is never used.\n", errout_str());

const Settings s = settingsBuilder(settings).library("windows.cfg").build();

check("int WinMain() { }", Platform::Type::Native, &s);

ASSERT_EQUALS("", errout_str());

check("int _tmain() { }", Platform::Type::Native, &s);

ASSERT_EQUALS("", errout_str());

}

void entrypointsWinU() {

check("int wWinMain() { }");

ASSERT_EQUALS("[test.cpp:1]: (style) The function 'wWinMain' is never used.\n", errout_str());

check("int _tmain() { }");

ASSERT_EQUALS("[test.cpp:1]: (style) The function '_tmain' is never used.\n", errout_str());

const Settings s = settingsBuilder(settings).library("windows.cfg").build();

check("int wWinMain() { }", Platform::Type::Native, &s);

ASSERT_EQUALS("", errout_str());

check("int _tmain() { }", Platform::Type::Native, &s);

ASSERT_EQUALS("", errout_str());

}

void entrypointsUnix() {

check("int _init() { }\n"

"int _fini() { }\n");

ASSERT_EQUALS("[test.cpp:1]: (style) The function '_init' is never used.\n"

"[test.cpp:2]: (style) The function '_fini' is never used.\n", errout_str());

const Settings s = settingsBuilder(settings).library("gnu.cfg").build();

check("int _init() { }\n"

"int _fini() { }\n", Platform::Type::Native, &s);

ASSERT_EQUALS("", errout_str());

}

// TODO: fails because the location information is not be preserved by PreprocessorHelper::getcode()

void includes()

{

// #11483

const char inc[] = "class A {\n"

"public:\n"

" void f() {}\n"

"};";

const char code[] = R"(#include "test.h")";

ScopedFile header("test.h", inc);

const std::string processed = PreprocessorHelper::getcode(settings, *this, code, "", "test.cpp");

check(processed);

TODO_ASSERT_EQUALS("[test.h:3]: (style) The function 'f' is never used.\n", "[test.cpp:3]: (style) The function 'f' is never used.\n", errout_str());

}

void virtualFunc()

{

check("struct D : public B {\n" // #10660

" virtual void f() {}\n"

" void g() override {}\n"

" void h() final {}\n"

"};\n");

ASSERT_EQUALS("", errout_str());

check("struct B {\n"

" virtual void f() = 0;\n"

" void g();\n"

"};\n"

"struct D : B {\n"

" void f() override {}\n"

"};\n"

"int main() {\n"

" D d;\n"

" d.g();\n"

"}\n");

ASSERT_EQUALS("", errout_str());

}

void parensInit()

{

check("struct S {\n" // #12898

" void url() {}\n"

"};\n"

"int main() {\n"

" const int url(0);\n"

"}\n");

ASSERT_EQUALS("[test.cpp:2]: (style) The function 'url' is never used.\n", errout_str());

}

void typeInCast()

{

check("struct S {\n" // #12901

" void Type() {}\n"

"};\n"

"int main() {\n"

" struct Type {} t;\n"

" Type t2{ (Type)t };\n"

"}\n");

ASSERT_EQUALS("[test.cpp:2]: (style) The function 'Type' is never used.\n", errout_str());

}

void attributeCleanup()

{

check("void clean(void *ptr) {}\n"

"int main() {\n"

" void * __attribute__((cleanup(clean))) p;\n"

"}\n");

ASSERT_EQUALS("", errout_str());

}