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cppcheck/test/testunusedprivfunc.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 Daniel Marjamäki and 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 "tokenize.h"
#include "checkclass.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestUnusedPrivateFunction : public TestFixture
{
public:
TestUnusedPrivateFunction() : TestFixture("TestUnusedPrivateFunction")
{ }
private:
void run()
{
TEST_CASE(test1);
TEST_CASE(test2);
TEST_CASE(test3);
TEST_CASE(test4);
TEST_CASE(test5);
// [ 2236547 ] False positive --style unused function, called via pointer
TEST_CASE(func_pointer1);
TEST_CASE(func_pointer2);
TEST_CASE(func_pointer3);
TEST_CASE(ctor);
TEST_CASE(classInClass);
TEST_CASE(sameFunctionNames);
TEST_CASE(incompleteImplementation);
TEST_CASE(derivedClass); // skip warning for derived classes. It might be a virtual function.
TEST_CASE(borland); // skip FP when using __property
// No false positives when there are "unused" templates that are removed in the simplified token list
TEST_CASE(template1);
}
void check(const char code[])
{
// Clear the error buffer..
errout.str("");
Settings settings;
settings._checkCodingStyle = true;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
// Check for unused private functions..
CheckClass checkClass(&tokenizer, &settings, this);
checkClass.privateFunctions();
}
void test1()
{
check("class Fred\n"
"{\n"
"private:\n"
" unsigned int f();\n"
"public:\n"
" Fred();\n"
"};\n"
"\n"
"Fred::Fred()\n"
"{ }\n"
"\n"
"unsigned int Fred::f()\n"
"{ }\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Unused private function 'Fred::f'\n", errout.str());
check("#file \"p.h\"\n"
"class Fred\n"
"{\n"
"private:\n"
" unsigned int f();\n"
"public:\n"
" Fred();\n"
"};\n"
"\n"
"#endfile\n"
"Fred::Fred()\n"
"{ }\n"
"\n"
"unsigned int Fred::f()\n"
"{ }\n");
ASSERT_EQUALS("[p.h:4]: (style) Unused private function 'Fred::f'\n", errout.str());
check("#file \"p.h\"\n"
"class Fred\n"
"{\n"
"private:\n"
"void f();\n"
"};\n"
"\n"
"\n"
"#endfile\n"
"\n"
"void Fred::f()\n"
"{\n"
"}\n"
"\n");
ASSERT_EQUALS("[p.h:4]: (style) Unused private function 'Fred::f'\n", errout.str());
// Don't warn about include files which implementation we don't see
check("#file \"p.h\"\n"
"class Fred\n"
"{\n"
"private:\n"
"void f();\n"
"void g() {}\n"
"};\n"
"\n"
"#endfile\n"
"\n"
"int main()\n"
"{\n"
"}\n"
"\n");
ASSERT_EQUALS("", errout.str());
}
void test2()
{
check("class A {\n"
"public:\n"
" A();\n"
"\n"
" void a() const\n"
" { b(); }\n"
"private:\n"
" void b( ) const\n"
" { }\n"
"};\n"
"\n"
"A::A()\n"
"{ }\n");
ASSERT_EQUALS("", errout.str());
}
void test3()
{
check("class A {\n"
"public:\n"
" A() { }\n"
" ~A();\n"
"private:\n"
" void B() { }\n"
"};\n"
"\n"
"A::~A()\n"
"{ B(); }\n");
ASSERT_EQUALS("", errout.str());
}
void test4()
{
check("class A {\n"
"public:\n"
" A();\n"
"private:\n"
" bool _owner;\n"
" void b() { }\n"
"};\n"
"\n"
"A::A() : _owner(false)\n"
"{ b(); }\n");
ASSERT_EQUALS("", errout.str());
}
void test5()
{
check("class A {\n"
"private:\n"
" A() : lock(new Lock())\n"
" { }\n"
" Lock *lock;\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void func_pointer1()
{
check("class Fred\n"
"{\n"
"private:\n"
" typedef void (*testfp)();\n"
"\n"
" testfp get()\n"
" {\n"
" return test;\n"
" }\n"
"\n"
" static void test()\n"
" { }\n"
"\n"
"public:\n"
" Fred();\n"
"};\n"
"\n"
"Fred::Fred()\n"
"{}\n");
ASSERT_EQUALS("[test.cpp:6]: (style) Unused private function 'Fred::get'\n", errout.str());
}
void func_pointer2()
{
check("class UnusedPrivateFunctionMemberPointer\n"
"{\n"
"public:\n"
" UnusedPrivateFunctionMemberPointer()\n"
" : mObserver(this, &UnusedPrivateFunctionMemberPointer::callback)\n"
" {}\n"
"\n"
"private:\n"
" void callback(const& unsigned) const {}\n"
"\n"
" Observer<UnusedPrivateFunctionMemberPointer, unsigned> mObserver;\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void func_pointer3()
{
check("class c1\n"
"{\n"
"public:\n"
" c1()\n"
" { sigc::mem_fun(this, &c1::f1); }\n"
"\n"
"private:\n"
" void f1() const {}\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void ctor()
{
check("class PrivateCtor\n"
"{\n"
"private:\n"
" PrivateCtor(int threadNum) :\n"
" numOfThreads(threadNum)\n"
" {\n"
" }\n"
"\n"
" int numOfThreads;\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void classInClass()
{
check("class A\n"
"{\n"
"public:\n"
"\n"
" class B\n"
" {\n"
" private:\n"
" };\n"
"\n"
" static void f()\n"
" { }\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("class A\n"
"{\n"
"public:\n"
" A()\n"
" { }\n"
"\n"
"private:\n"
" void f()\n"
" { }\n"
"\n"
" class B\n"
" {\n"
" public:\n"
" B(A *a)\n"
" { a->f(); }\n"
" };\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void sameFunctionNames()
{
check("class A\n"
"{\n"
"public:\n"
" void a()\n"
" {\n"
" f(1);\n"
" }\n"
"\n"
"private:\n"
" void f() { }\n"
" void f(int) { }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void incompleteImplementation()
{
// The implementation for "A::a" is missing - so don't check if
// "A::b" is used or not
check("#file \"test.h\"\n"
"class A\n"
"{\n"
"public:\n"
" A()\n"
" void a();\n"
"private:\n"
" void b();\n"
"};\n"
"#endfile\n"
"A::A() { }\n"
"void A::b() { }\n");
ASSERT_EQUALS("", errout.str());
}
void derivedClass()
{
// skip warning in derived classes in case the function is virtual
check("class derived : public base\n"
"{\n"
"public:\n"
" derived() : base() { }\n"
"private:\n"
" void f();\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void borland()
{
// ticket #2034 - Borland C++ __property
check("class Foo {\n"
"private:\n"
" int getx() {\n"
" return 123;\n"
" }\n"
"public:\n"
" Foo() { }\n"
" __property int x = {read=getx}\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void template1()
{
// ticket #2067 - Template methods do not "use" private ones
check("class A {\n"
"public:\n"
" template <class T>\n"
" T getVal() const;\n"
"\n"
"private:\n"
" int internalGetVal() const { return 8000; }\n"
"};\n"
"\n"
"template <class T>\n"
"T A::getVal() const {\n"
" return internalGetVal();\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestUnusedPrivateFunction)
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