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cppcheck/test/testunusedfunctions.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2023 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "checkunusedfunctions.h"
#include "errortypes.h"
#include "platform.h"
#include "settings.h"
#include "fixture.h"
#include "tokenize.h"
#include <sstream>
#include <string>
class TestUnusedFunctions : public TestFixture {
public:
TestUnusedFunctions() : TestFixture("TestUnusedFunctions") {}
private:
const Settings settings = settingsBuilder().severity(Severity::style).build();
void run() override {
TEST_CASE(incondition);
TEST_CASE(return1);
TEST_CASE(return2);
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(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(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);
}
#define check(...) check_(__FILE__, __LINE__, __VA_ARGS__)
void check_(const char* file, int line, const char code[], cppcheck::Platform::Type platform = cppcheck::Platform::Type::Native, const Settings *s = nullptr) {
// Clear the error buffer..
errout.str("");
const Settings settings1 = settingsBuilder(s ? *s : settings).platform(platform).build();
// Tokenize..
Tokenizer tokenizer(&settings1, this);
std::istringstream istr(code);
ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);
// Check for unused functions..
CheckUnusedFunctions checkUnusedFunctions(&tokenizer, &settings1, this);
checkUnusedFunctions.parseTokens(tokenizer, "someFile.c", &settings1);
// check() returns error if and only if errout is not empty.
if ((checkUnusedFunctions.check)(this, settings1)) {
ASSERT(!errout.str().empty());
} else {
ASSERT_EQUALS("", errout.str());
}
}
void incondition() {
check("int f1()\n"
"{\n"
" if (f1())\n"
" { }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void return1() {
check("int f1()\n"
"{\n"
" return f1();\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void return2() {
check("char * foo()\n"
"{\n"
" return *foo();\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void callback1() {
check("void f1()\n"
"{\n"
" void (*f)() = cond ? f1 : NULL;\n"
"}");
ASSERT_EQUALS("", 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("", 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());
}
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("", 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("", 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 S {\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 S {\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() { // #7739
check("template<class T>\n"
"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());
}
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"
"{}\n"
"parse(line, blanks_p >> ident[&_xy] >> blanks_p >> eol_p).full");
ASSERT_EQUALS("", 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());
}
void multipleFiles() {
Tokenizer tokenizer(&settings, this);
CheckUnusedFunctions c(&tokenizer, &settings, nullptr);
// Clear the error buffer..
errout.str("");
const char code[] = "static void f() { }";
for (int i = 1; i <= 2; ++i) {
std::ostringstream fname;
fname << "test" << i << ".cpp";
// Clear the error buffer..
errout.str("");
Tokenizer tokenizer2(&settings, this);
std::istringstream istr(code);
ASSERT(tokenizer2.tokenize(istr, fname.str().c_str()));
c.parseTokens(tokenizer2, "someFile.c", &settings);
}
// Check for unused functions..
(c.check)(this, settings);
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() { }", cppcheck::Platform::Type::Native, &s);
ASSERT_EQUALS("", errout.str());
check("int _tmain() { }", cppcheck::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() { }", cppcheck::Platform::Type::Native, &s);
ASSERT_EQUALS("", errout.str());
check("int _tmain() { }", cppcheck::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", cppcheck::Platform::Type::Native, &s);
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestUnusedFunctions)
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