873 lines
26 KiB
C++
873 lines
26 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2023 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "checkclass.h"
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#include "errortypes.h"
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#include "helpers.h"
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#include "platform.h"
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#include "settings.h"
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#include "fixture.h"
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#include "tokenize.h"
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#include <sstream> // IWYU pragma: keep
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#include <string>
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#include <vector>
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class TestUnusedPrivateFunction : public TestFixture {
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public:
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TestUnusedPrivateFunction() : TestFixture("TestUnusedPrivateFunction") {}
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private:
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const Settings settings = settingsBuilder().severity(Severity::style).build();
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void run() override {
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TEST_CASE(test1);
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TEST_CASE(test2);
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TEST_CASE(test3);
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TEST_CASE(test4);
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TEST_CASE(test5);
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TEST_CASE(test6); // ticket #2602
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TEST_CASE(test7); // ticket #9282
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// [ 2236547 ] False positive --style unused function, called via pointer
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TEST_CASE(func_pointer1);
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TEST_CASE(func_pointer2);
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TEST_CASE(func_pointer3);
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TEST_CASE(func_pointer4); // ticket #2807
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TEST_CASE(func_pointer5); // ticket #2233
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TEST_CASE(func_pointer6); // ticket #4787
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TEST_CASE(func_pointer7); // ticket #10516
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TEST_CASE(ctor);
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TEST_CASE(ctor2);
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TEST_CASE(classInClass);
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TEST_CASE(sameFunctionNames);
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TEST_CASE(incompleteImplementation);
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TEST_CASE(derivedClass); // skip warning for derived classes. It might be a virtual function.
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TEST_CASE(friendClass);
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TEST_CASE(borland1); // skip FP when using __property
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TEST_CASE(borland2); // skip FP when using __published
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// No false positives when there are "unused" templates that are removed in the simplified token list
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TEST_CASE(template1);
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// #2407 - FP when called from operator()
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TEST_CASE(fp_operator);
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TEST_CASE(testDoesNotIdentifyMethodAsFirstFunctionArgument); // #2480
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TEST_CASE(testDoesNotIdentifyMethodAsMiddleFunctionArgument);
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TEST_CASE(testDoesNotIdentifyMethodAsLastFunctionArgument);
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TEST_CASE(multiFile);
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TEST_CASE(unknownBaseTemplate); // ticket #2580
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TEST_CASE(hierarchy_loop); // ticket 5590
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TEST_CASE(staticVariable); //ticket #5566
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TEST_CASE(templateSimplification); //ticket #6183
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TEST_CASE(maybeUnused);
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}
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#define check(...) check_(__FILE__, __LINE__, __VA_ARGS__)
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void check_(const char* file, int line, const char code[], Platform::Type platform = Platform::Type::Native) {
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// Clear the error buffer..
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errout.str("");
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const Settings settings1 = settingsBuilder(settings).platform(platform).build();
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std::vector<std::string> files(1, "test.cpp");
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Tokenizer tokenizer(&settings1, this);
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PreprocessorHelper::preprocess(code, files, tokenizer);
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// Tokenize..
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ASSERT_LOC(tokenizer.simplifyTokens1(""), file, line);
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// Check for unused private functions..
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CheckClass checkClass(&tokenizer, &settings1, this);
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checkClass.privateFunctions();
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}
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void test1() {
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check("class Fred\n"
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"{\n"
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"private:\n"
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" unsigned int f();\n"
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"public:\n"
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" Fred();\n"
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"};\n"
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"\n"
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"Fred::Fred()\n"
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"{ }\n"
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"\n"
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"unsigned int Fred::f()\n"
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"{ }");
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ASSERT_EQUALS("[test.cpp:4]: (style) Unused private function: 'Fred::f'\n", errout.str());
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check("#line 1 \"p.h\"\n"
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"class Fred\n"
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"{\n"
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"private:\n"
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" unsigned int f();\n"
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"public:\n"
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" Fred();\n"
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"};\n"
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"\n"
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"#line 1 \"p.cpp\"\n"
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"Fred::Fred()\n"
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"{ }\n"
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"\n"
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"unsigned int Fred::f()\n"
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"{ }");
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ASSERT_EQUALS("[p.h:4]: (style) Unused private function: 'Fred::f'\n", errout.str());
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check("#line 1 \"p.h\"\n"
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"class Fred\n"
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"{\n"
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"private:\n"
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"void f();\n"
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"};\n"
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"\n"
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"\n"
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"#line 1 \"p.cpp\"\n"
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"\n"
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"void Fred::f()\n"
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"{\n"
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"}");
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ASSERT_EQUALS("[p.h:4]: (style) Unused private function: 'Fred::f'\n", errout.str());
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// Don't warn about include files which implementation we don't see
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check("#line 1 \"p.h\"\n"
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"class Fred\n"
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"{\n"
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"private:\n"
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"void f();\n"
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"void g() {}\n"
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"};\n"
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"\n"
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"#line 1 \"p.cpp\"\n"
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"\n"
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"int main()\n"
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"{\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void test2() {
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check("class A {\n"
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"public:\n"
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" A();\n"
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"\n"
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" void a() const\n"
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" { b(); }\n"
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"private:\n"
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" void b( ) const\n"
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" { }\n"
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"};\n"
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"\n"
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"A::A()\n"
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"{ }");
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ASSERT_EQUALS("", errout.str());
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}
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void test3() {
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check("class A {\n"
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"public:\n"
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" A() { }\n"
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" ~A();\n"
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"private:\n"
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" void B() { }\n"
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"};\n"
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"\n"
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"A::~A()\n"
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"{ B(); }");
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ASSERT_EQUALS("", errout.str());
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}
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void test4() {
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check("class A {\n"
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"public:\n"
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" A();\n"
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"private:\n"
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" bool _owner;\n"
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" void b() { }\n"
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"};\n"
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"\n"
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"A::A() : _owner(false)\n"
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"{ b(); }");
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ASSERT_EQUALS("", errout.str());
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}
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void test5() {
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check("class A {\n"
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"private:\n"
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" A() : lock(new Lock())\n"
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" { }\n"
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" Lock *lock;\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void test6() { // ticket #2602 segmentation fault
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check("class A {\n"
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" A& operator=(const A&);\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void test7() { // ticket #9282
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check("class C {\n"
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" double f1() const noexcept, f2(double) const noexcept;\n"
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" void f3() const noexcept;\n"
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"};\n"
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"double C::f1() const noexcept { f3(); }\n"
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"void C::f3() const noexcept {}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void func_pointer1() {
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check("class Fred\n"
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"{\n"
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"private:\n"
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" typedef void (*testfp)();\n"
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"\n"
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" testfp get()\n"
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" {\n"
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" return test;\n"
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" }\n"
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"\n"
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" static void test()\n"
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" { }\n"
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"\n"
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"public:\n"
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" Fred();\n"
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"};\n"
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"\n"
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"Fred::Fred()\n"
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"{}");
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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() {
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check("class UnusedPrivateFunctionMemberPointer\n"
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"{\n"
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"public:\n"
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" UnusedPrivateFunctionMemberPointer()\n"
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" : mObserver(this, &UnusedPrivateFunctionMemberPointer::callback)\n"
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" {}\n"
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"\n"
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"private:\n"
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" void callback(const& unsigned) const {}\n"
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"\n"
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" Observer<UnusedPrivateFunctionMemberPointer, unsigned> mObserver;\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void func_pointer3() {
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check("class c1\n"
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"{\n"
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"public:\n"
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" c1()\n"
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" { sigc::mem_fun(this, &c1::f1); }\n"
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"\n"
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"private:\n"
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" void f1() const {}\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void func_pointer4() { // ticket #2807
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check("class myclass {\n"
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"public:\n"
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" myclass();\n"
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"private:\n"
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" static void f();\n"
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" void (*fptr)();\n"
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"};\n"
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"myclass::myclass() { fptr = &f; }\n"
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"void myclass::f() {}");
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ASSERT_EQUALS("", errout.str());
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}
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void func_pointer5() {
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check("class A {\n"
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"public:\n"
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" A() { f = A::func; }\n"
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" void (*f)();\n"
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"private:\n"
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" static void func() { }\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void func_pointer6() { // #4787
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check("class Test {\n"
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"private:\n"
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" static void a(const char* p) { }\n"
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"public:\n"
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" void test(void* f = a) {\n"
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" f(\"test\");\n"
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" }\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void func_pointer7() { // #10516
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check("class C {\n"
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" static void f() {}\n"
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" static constexpr void(*p)() = f;\n"
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"};\n");
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ASSERT_EQUALS("", errout.str());
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check("class C {\n"
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" static void f() {}\n"
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" static constexpr void(*p)() = &f;\n"
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"};\n");
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ASSERT_EQUALS("", errout.str());
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check("class C {\n"
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" static void f() {}\n"
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" static constexpr void(*p)() = C::f;\n"
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"};\n");
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ASSERT_EQUALS("", errout.str());
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check("class C {\n"
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" static void f() {}\n"
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" static constexpr void(*p)() = &C::f;\n"
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"};\n");
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ASSERT_EQUALS("", errout.str());
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}
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void ctor() {
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check("class PrivateCtor\n"
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"{\n"
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"private:\n"
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" PrivateCtor(int threadNum) :\n"
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" numOfThreads(threadNum)\n"
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" {\n"
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" }\n"
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"\n"
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" int numOfThreads;\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void ctor2() {
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check("struct State {\n"
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" State(double const totalWeighting= TotalWeighting()) :\n"
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" totalWeighting_(totalWeighting) {}\n"
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"private:\n"
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" double TotalWeighting() { return 123.0; }\n" // called from constructor
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"public:\n"
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" double totalWeighting_;\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void classInClass() {
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check("class A\n"
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"{\n"
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"public:\n"
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"\n"
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" class B\n"
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" {\n"
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" private:\n"
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" };\n"
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"private:\n"
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" static void f()\n"
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" { }\n"
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"};");
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ASSERT_EQUALS("[test.cpp:10]: (style) Unused private function: 'A::f'\n", errout.str());
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check("class A\n"
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"{\n"
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"public:\n"
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" A()\n"
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" { }\n"
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"\n"
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"private:\n"
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" void f()\n"
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" { }\n"
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"\n"
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" class B\n"
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" {\n"
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" public:\n"
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" B(A *a)\n"
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" { a->f(); }\n"
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" };\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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check("class A {\n" // #6968 - outer definition
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"public:\n"
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" class B;\n"
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"private:\n"
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" void f() {}\n"
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"}\n"
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"class A::B {"
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" B() { A a; a.f(); }\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void sameFunctionNames() {
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check("class A\n"
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"{\n"
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"public:\n"
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" void a()\n"
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" {\n"
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" f(1);\n"
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" }\n"
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"\n"
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"private:\n"
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" void f() { }\n"
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" void f(int) { }\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void incompleteImplementation() {
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// The implementation for "A::a" is missing - so don't check if
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// "A::b" is used or not
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check("#file \"test.h\"\n"
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"class A\n"
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"{\n"
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"public:\n"
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" A();\n"
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" void a();\n"
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"private:\n"
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" void b();\n"
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"};\n"
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"#endfile\n"
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"A::A() { }\n"
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"void A::b() { }");
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ASSERT_EQUALS("", errout.str());
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}
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void derivedClass() {
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// skip warning in derived classes in case the base class is invisible
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check("class derived : public base\n"
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"{\n"
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"public:\n"
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" derived() : base() { }\n"
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"private:\n"
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" void f();\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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check("class base {\n"
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"public:\n"
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" virtual void foo();\n"
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" void bar();\n"
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"};\n"
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"class derived : public base {\n"
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"private:\n"
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" void foo() {}\n" // Skip for overrides of virtual functions of base
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" void bar() {}\n" // Don't skip if no function is overridden
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"};");
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ASSERT_EQUALS("[test.cpp:9]: (style) Unused private function: 'derived::bar'\n", errout.str());
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check("class Base {\n"
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"private:\n"
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" virtual void func() = 0;\n"
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"public:\n"
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" void public_func() {\n"
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" func();\n"
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" };\n"
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"};\n"
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"\n"
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"class Derived1: public Base {\n"
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"private:\n"
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" void func() {}\n"
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"};\n"
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"class Derived2: public Derived1 {\n"
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"private:\n"
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" void func() {}\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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check("class Base {\n"
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"public:\n"
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" void dostuff() {\n"
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" f();\n"
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" }\n"
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"\n"
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"private:\n"
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" virtual Base* f() = 0;\n"
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"};\n"
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"\n"
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"class Derived : public Base {\n"
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"private:\n"
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" Derived* f() {\n"
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" return 0;\n"
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" }\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void friendClass() {
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// ticket #2459 - friend class
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check("class Foo {\n"
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"private:\n"
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" friend Bar;\n" // Unknown friend class
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" void f() { }\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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check("struct Bar {\n"
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" void g() { f(); }\n" // Friend class seen, but f not seen
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"};\n"
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"class Foo {\n"
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"private:\n"
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" friend Bar;\n"
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" void f();\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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check("struct Bar {\n"
|
|
" void g() { f(); }\n" // Friend class seen, but f() used in it
|
|
"};\n"
|
|
"class Foo {\n"
|
|
"private:\n"
|
|
" friend Bar;\n"
|
|
" void f() { }\n"
|
|
"};");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("class Bar {\n" // Friend class seen, f() not used in it
|
|
"};\n"
|
|
"class Foo {\n"
|
|
" friend Bar;\n"
|
|
" void f() { }\n"
|
|
"};");
|
|
ASSERT_EQUALS("[test.cpp:5]: (style) Unused private function: 'Foo::f'\n", errout.str());
|
|
|
|
check("struct F;\n" // #10265
|
|
"struct S {\n"
|
|
" int i{};\n"
|
|
" friend struct F;\n"
|
|
"private:\n"
|
|
" int f() const { return i; }\n"
|
|
"};\n"
|
|
"struct F {\n"
|
|
" bool operator()(const S& lhs, const S& rhs) const {\n"
|
|
" return lhs.f() < rhs.f();\n"
|
|
" }\n"
|
|
"};");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void borland1() {
|
|
// 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"
|
|
"};", Platform::Type::Win32A);
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void borland2() {
|
|
// ticket #3661 - Borland C++ __published
|
|
check("class Foo {\n"
|
|
"__published:\n"
|
|
" int getx() {\n"
|
|
" return 123;\n"
|
|
" }\n"
|
|
"public:\n"
|
|
" Foo() { }\n"
|
|
"};", Platform::Type::Win32A);
|
|
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"
|
|
"};");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
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"
|
|
"};");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("class Fred\n"
|
|
"{\n"
|
|
"public:\n"
|
|
" void operator()(int x) {\n"
|
|
" }\n"
|
|
"\n"
|
|
"private:\n"
|
|
" void startListening() {\n"
|
|
" }\n"
|
|
"};");
|
|
ASSERT_EQUALS("[test.cpp:8]: (style) Unused private function: 'Fred::startListening'\n", errout.str());
|
|
|
|
// #5059
|
|
check("class Fred {\n"
|
|
" void* operator new(size_t obj_size, size_t buf_size) {}\n"
|
|
"};");
|
|
TODO_ASSERT_EQUALS("[test.cpp:2]: (style) Unused private function: 'Fred::operatornew'\n", "", errout.str()); // No message for operators - we currently cannot check their usage
|
|
|
|
check("class Fred {\n"
|
|
" void* operator new(size_t obj_size, size_t buf_size) {}\n"
|
|
"public:\n"
|
|
" void* foo() { return new(size) Fred(); }\n"
|
|
"};");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void testDoesNotIdentifyMethodAsFirstFunctionArgument() {
|
|
check("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());
|
|
}
|
|
|
|
void testDoesNotIdentifyMethodAsMiddleFunctionArgument() {
|
|
check("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());
|
|
}
|
|
|
|
void testDoesNotIdentifyMethodAsLastFunctionArgument() {
|
|
check("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());
|
|
}
|
|
|
|
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"
|
|
"}");
|
|
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
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());
|
|
}
|
|
|
|
void hierarchy_loop() {
|
|
check("class InfiniteB : InfiniteA {\n"
|
|
" class D {\n"
|
|
" };\n"
|
|
"};\n"
|
|
"namespace N {\n"
|
|
" class InfiniteA : InfiniteB {\n"
|
|
" };\n"
|
|
"}\n"
|
|
"class InfiniteA : InfiniteB {\n"
|
|
" void foo();\n"
|
|
"};\n"
|
|
"void InfiniteA::foo() {\n"
|
|
" C a;\n"
|
|
"}");
|
|
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void staticVariable() {
|
|
check("class Foo {\n"
|
|
" static int i;\n"
|
|
" static int F() const { return 1; }\n"
|
|
"};\n"
|
|
"int Foo::i = Foo::F();");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("class Foo {\n"
|
|
" static int i;\n"
|
|
" int F() const { return 1; }\n"
|
|
"};\n"
|
|
"Foo f;\n"
|
|
"int Foo::i = f.F();");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("class Foo {\n"
|
|
" static int i;\n"
|
|
" static int F() const { return 1; }\n"
|
|
"};\n"
|
|
"int Foo::i = sth();"
|
|
"int i = F();");
|
|
ASSERT_EQUALS("[test.cpp:3]: (style) Unused private function: 'Foo::F'\n", errout.str());
|
|
}
|
|
|
|
void templateSimplification() { //ticket #6183
|
|
check("class CTest {\n"
|
|
"public:\n"
|
|
" template <typename T>\n"
|
|
" static void Greeting(T val) {\n"
|
|
" std::cout << val << std::endl;\n"
|
|
" }\n"
|
|
"private:\n"
|
|
" static void SayHello() {\n"
|
|
" std::cout << \"Hello World!\" << std::endl;\n"
|
|
" }\n"
|
|
"};\n"
|
|
"template<>\n"
|
|
"void CTest::Greeting(bool) {\n"
|
|
" CTest::SayHello();\n"
|
|
"}\n"
|
|
"int main() {\n"
|
|
" CTest::Greeting<bool>(true);\n"
|
|
" return 0;\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void maybeUnused() {
|
|
check("class C {\n"
|
|
" [[maybe_unused]] int f() { return 42; }\n"
|
|
"};");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
};
|
|
|
|
REGISTER_TEST(TestUnusedPrivateFunction)
|