cppcheck/test/testunusedprivfunc.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
2012-01-01 00:05:37 +01:00
* Copyright (C) 2007-2012 Daniel Marjamäki and Cppcheck team.
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*
* 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/>.
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*/
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#include "tokenize.h"
#include "checkclass.h"
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#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
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class TestUnusedPrivateFunction : public TestFixture {
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public:
TestUnusedPrivateFunction() : TestFixture("TestUnusedPrivateFunction")
{ }
private:
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void run() {
TEST_CASE(test1);
TEST_CASE(test2);
TEST_CASE(test3);
TEST_CASE(test4);
TEST_CASE(test5);
TEST_CASE(test6); // ticket #2602
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// [ 2236547 ] False positive --style unused function, called via pointer
TEST_CASE(func_pointer1);
TEST_CASE(func_pointer2);
TEST_CASE(func_pointer3);
TEST_CASE(func_pointer4); // ticket #2807
TEST_CASE(func_pointer5); // ticket #2233
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(friendClass);
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);
// #2407 - FP when called from operator()
TEST_CASE(fp_operator);
TEST_CASE(testDoesNotIdentifyMethodAsFirstFunctionArgument); // #2480
TEST_CASE(testDoesNotIdentifyMethodAsMiddleFunctionArgument);
TEST_CASE(testDoesNotIdentifyMethodAsLastFunctionArgument);
TEST_CASE(multiFile);
TEST_CASE(unknownBaseTemplate); // ticket #2580
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}
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void check(const char code[]) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("style");
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// Tokenize..
Tokenizer tokenizer(&settings, this);
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std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
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// Check for unused private functions..
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CheckClass checkClass(&tokenizer, &settings, this);
checkClass.privateFunctions();
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}
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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());
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}
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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());
}
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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());
}
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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());
}
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void test5() {
check("class A {\n"
"private:\n"
" A() : lock(new Lock())\n"
" { }\n"
" Lock *lock;\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
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void test6() { // ticket #2602 segmentation fault
check("class A {\n"
" A& operator=(const A&);\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
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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());
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}
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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());
}
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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());
}
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void func_pointer4() { // ticket #2807
check("class myclass {\n"
"public:\n"
" myclass();\n"
"private:\n"
" static void f();\n"
" void (*fptr)();\n"
"};\n"
"myclass::myclass() { fptr = &f; }\n"
"void myclass::f() {}\n");
ASSERT_EQUALS("", errout.str());
}
void func_pointer5() {
check("class A {\n"
"public:\n"
" A() { f = A::func; }\n"
" void (*f)();\n"
"private:\n"
" static void func() { }\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
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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());
}
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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());
}
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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());
}
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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());
}
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void derivedClass() {
// skip warning in derived classes in case the base class is invisible
check("class derived : public base\n"
"{\n"
"public:\n"
" derived() : base() { }\n"
"private:\n"
" void f();\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("class base {\n"
"public:\n"
" virtual void foo();\n"
" void bar();\n"
"};\n"
"class derived : public base {\n"
"private:\n"
" void foo() {}\n" // Skip for overrides of virtual functions of base
" void bar() {}\n" // Don't skip if no function is overriden
"};");
ASSERT_EQUALS("[test.cpp:9]: (style) Unused private function 'derived::bar'\n", errout.str());
}
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void friendClass() {
// ticket #2459 - friend class
check("class Foo {\n"
"private:\n"
" friend Bar;\n"
" void f() { }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
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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());
}
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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());
}
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void fp_operator() {
// #2407 - FP when function is called from operator()
check("class Fred\n"
"{\n"
"public:\n"
" void operator()(int x) {\n"
" startListening();\n"
" }\n"
"\n"
"private:\n"
" void startListening() {\n"
" }\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("class Fred\n"
"{\n"
"public:\n"
" void operator()(int x) {\n"
" }\n"
"\n"
"private:\n"
" void startListening() {\n"
" }\n"
"};\n");
ASSERT_EQUALS("[test.cpp:8]: (style) Unused private function 'Fred::startListening'\n", errout.str());
}
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void testDoesNotIdentifyMethodAsFirstFunctionArgument() {
check("#include <iostream>"
"void callback(void (*func)(int), int arg)"
"{"
" (*func)(arg);"
"}"
"class MountOperation"
"{"
" static void Completed(int i);"
"public:"
" MountOperation(int i);"
"};"
"void MountOperation::Completed(int i)"
"{"
" std::cerr << i << std::endl;"
"}"
"MountOperation::MountOperation(int i)"
"{"
" callback(MountOperation::Completed, i);"
"}"
"int main(void)"
"{"
" MountOperation aExample(10);"
"}"
);
ASSERT_EQUALS("", errout.str());
}
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void testDoesNotIdentifyMethodAsMiddleFunctionArgument() {
check("#include <iostream>"
"void callback(char, void (*func)(int), int arg)"
"{"
" (*func)(arg);"
"}"
"class MountOperation"
"{"
" static void Completed(int i);"
"public:"
" MountOperation(int i);"
"};"
"void MountOperation::Completed(int i)"
"{"
" std::cerr << i << std::endl;"
"}"
"MountOperation::MountOperation(int i)"
"{"
" callback('a', MountOperation::Completed, i);"
"}"
"int main(void)"
"{"
" MountOperation aExample(10);"
"}"
);
ASSERT_EQUALS("", errout.str());
}
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void testDoesNotIdentifyMethodAsLastFunctionArgument() {
check("#include <iostream>"
"void callback(int arg, void (*func)(int))"
"{"
" (*func)(arg);"
"}"
"class MountOperation"
"{"
" static void Completed(int i);"
"public:"
" MountOperation(int i);"
"};"
"void MountOperation::Completed(int i)"
"{"
" std::cerr << i << std::endl;"
"}"
"MountOperation::MountOperation(int i)"
"{"
" callback(i, MountOperation::Completed);"
"}"
"int main(void)"
"{"
" MountOperation aExample(10);"
"}"
);
ASSERT_EQUALS("", errout.str());
}
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void multiFile() { // ticket #2567
check("#file \"test.h\"\n"
"struct Fred\n"
"{\n"
" Fred()\n"
" {\n"
" Init();\n"
" }\n"
"private:\n"
" void Init();\n"
"};\n"
"#endfile\n"
"void Fred::Init()\n"
"{\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
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void unknownBaseTemplate() { // ticket #2580
check("class Bla : public Base2<Base> {\n"
"public:\n"
" Bla() {}\n"
"private:\n"
" virtual void F() const;\n"
"};\n"
"void Bla::F() const { }");
ASSERT_EQUALS("", errout.str());
}
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};
REGISTER_TEST(TestUnusedPrivateFunction)
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