45de338f1b
This is a mess. The version is AUR is still outdated and also doesn't install anymore. Fedora 38 carries the latest version of it so use that now. Keep the old steps in case we need to switch again in the future.
679 lines
23 KiB
C++
679 lines
23 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 "checkunusedfunctions.h"
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#include "errortypes.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>
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class TestUnusedFunctions : public TestFixture {
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public:
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TestUnusedFunctions() : TestFixture("TestUnusedFunctions") {}
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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(incondition);
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TEST_CASE(return1);
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TEST_CASE(return2);
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TEST_CASE(return3);
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TEST_CASE(callback1);
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TEST_CASE(callback2);
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TEST_CASE(else1);
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TEST_CASE(functionpointer);
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TEST_CASE(template1);
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TEST_CASE(template2);
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TEST_CASE(template3);
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TEST_CASE(template4); // #9805
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TEST_CASE(template5);
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TEST_CASE(template6); // #10475 crash
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TEST_CASE(template7); // #9766 crash
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TEST_CASE(template8);
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TEST_CASE(template9);
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TEST_CASE(throwIsNotAFunction);
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TEST_CASE(unusedError);
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TEST_CASE(unusedMain);
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TEST_CASE(initializationIsNotAFunction);
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TEST_CASE(operator1); // #3195
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TEST_CASE(operator2); // #7974
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TEST_CASE(returnRef);
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TEST_CASE(attribute); // #3471 - FP __attribute__(constructor)
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TEST_CASE(initializer_list);
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TEST_CASE(member_function_ternary);
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TEST_CASE(boost);
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TEST_CASE(enumValues);
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TEST_CASE(multipleFiles); // same function name in multiple files
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TEST_CASE(lineNumber); // Ticket 3059
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TEST_CASE(ignore_declaration); // ignore declaration
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TEST_CASE(operatorOverload);
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TEST_CASE(entrypointsWin);
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TEST_CASE(entrypointsWinU);
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TEST_CASE(entrypointsUnix);
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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[], cppcheck::Platform::Type platform = cppcheck::Platform::Type::Native, const Settings *s = nullptr) {
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// Clear the error buffer..
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errout.str("");
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const Settings settings1 = settingsBuilder(s ? *s : settings).platform(platform).build();
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// Tokenize..
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Tokenizer tokenizer(&settings1, this);
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std::istringstream istr(code);
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ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);
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// Check for unused functions..
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CheckUnusedFunctions checkUnusedFunctions(&tokenizer, &settings1, this);
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checkUnusedFunctions.parseTokens(tokenizer, "someFile.c", &settings1);
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// check() returns error if and only if errout is not empty.
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if ((checkUnusedFunctions.check)(this, settings1)) {
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ASSERT(!errout.str().empty());
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} else {
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ASSERT_EQUALS("", errout.str());
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}
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}
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void incondition() {
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check("int f1()\n"
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"{\n"
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" if (f1())\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 return1() {
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check("int f1()\n"
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"{\n"
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" return f1();\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void return2() {
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check("char * foo()\n"
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"{\n"
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" return *foo();\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void return3() {
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check("typedef void (*VoidFunc)();\n" // #9602
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"void sayHello() {\n"
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" printf(\"Hello World\\n\");\n"
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"}\n"
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"VoidFunc getEventHandler() {\n"
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" return sayHello;\n"
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"}\n"
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"void indirectHello() {\n"
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" VoidFunc handler = getEventHandler();\n"
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" handler();\n"
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"}\n"
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"int main() {\n"
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" indirectHello();\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void callback1() {
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check("void f1()\n"
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"{\n"
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" void (*f)() = cond ? f1 : NULL;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void callback2() { // #8677
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check("class C {\n"
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"public:\n"
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" void callback();\n"
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" void start();\n"
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"};\n"
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"\n"
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"void C::callback() {}\n" // <- not unused
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"\n"
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"void C::start() { ev.set<C, &C::callback>(this); }");
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ASSERT_EQUALS("[test.cpp:9]: (style) The function 'start' is never used.\n", errout.str());
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}
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void else1() {
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check("void f1()\n"
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"{\n"
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" if (cond) ;\n"
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" else f1();\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void functionpointer() {
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check("void foo() { }\n"
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"int main() {\n"
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" f(&foo);\n"
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" return 0\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("void foo() { }\n"
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"int main() {\n"
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" f(&::foo);\n"
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" return 0\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("namespace abc {\n"
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" void foo() { }\n"
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"};\n"
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"int main() {\n"
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" f(&abc::foo);\n"
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" return 0\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("namespace abc {\n"
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" void foo() { }\n"
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"};\n"
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"int main() {\n"
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" f = &abc::foo;\n"
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" return 0\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("namespace abc {\n"
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" void foo() { }\n"
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"};\n"
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"int main() {\n"
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" f = &::abc::foo;\n"
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" return 0\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("namespace abc {\n" // #3875
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" void foo() { }\n"
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"};\n"
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"int main() {\n"
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" f(abc::foo);\n"
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" return 0\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void template1() {
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check("template<class T> void foo() { }\n"
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"\n"
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"int main()\n"
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"{\n"
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" foo<int>();\n"
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" return 0\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void template2() {
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check("void f() { }\n"
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"\n"
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"template<class T> void g()\n"
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"{\n"
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" f();\n"
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"}\n"
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"\n"
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"void h() { g<int>(); h(); }");
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ASSERT_EQUALS("", errout.str());
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}
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void template3() { // #4701
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check("class X {\n"
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"public:\n"
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" void bar() { foo<int>(0); }\n"
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"private:\n"
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" template<typename T> void foo( T t ) const;\n"
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"};\n"
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"template<typename T> void X::foo( T t ) const { }");
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ASSERT_EQUALS("[test.cpp:3]: (style) The function 'bar' is never used.\n", errout.str());
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}
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void template4() { // #9805
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check("struct A {\n"
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" int a = 0;\n"
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" void f() { a = 1; }\n"
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" template <typename T, typename... Args> auto call(const Args &... args) -> T {\n"
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" a = 2;\n"
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" return T{};\n"
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" }\n"
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"};\n"
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"\n"
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"struct B : public A {\n"
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" void test() {\n"
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" f();\n"
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" call<int>(1, 2, 3);\n"
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" 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 template5() { // #9220
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check("void f(){}\n"
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"\n"
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"typedef void(*Filter)();\n"
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"\n"
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"template <Filter fun>\n"
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"void g() { fun(); }\n"
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"\n"
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"int main() { g<f>(); return 0;}");
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ASSERT_EQUALS("", errout.str());
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}
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void template6() { // #10475
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check("template<template<typename...> class Ref, typename... Args>\n"
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"struct Foo<Ref<Args...>, Ref> : std::true_type {};\n");
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ASSERT_EQUALS("", errout.str());
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}
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void template7()
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{ // #9766
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check("void f() {\n"
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" std::array<std::array<double,3>,3> array;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:1]: (style) The function 'f' is never used.\n", errout.str());
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}
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void template8() { // #11485
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check("struct S {\n"
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" template<typename T>\n"
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" void tf(const T&) { }\n"
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"};\n");
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ASSERT_EQUALS("[test.cpp:3]: (style) The function 'tf' is never used.\n", errout.str());
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check("struct S {\n"
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" template<typename T>\n"
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" void tf(const T&) { }\n"
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"};\n"
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"int main() {\n"
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" C c;\n"
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" c.tf(1.5);\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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check("struct S {\n"
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" template<typename T>\n"
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" void tf(const T&) { }\n"
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"};\n"
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"int main() {\n"
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" C c;\n"
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" c.tf<int>(1);\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void template9() {
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check("template<class T>\n" // #7739
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"void f(T const& t) {}\n"
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"template<class T>\n"
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"void g(T const& t) {\n"
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" f(t);\n"
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"}\n"
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"template<>\n"
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"void f<double>(double const& d) {}\n"
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"int main() {\n"
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" g(2);\n"
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" g(3.14);\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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check("template <typename T> T f(T);\n" // #9222
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"template <typename T> T f(T i) { return i; }\n"
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"template int f<int>(int);\n"
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"int main() { return f(int(2)); }\n");
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ASSERT_EQUALS("", errout.str());
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}
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void throwIsNotAFunction() {
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check("struct A {void f() const throw () {}}; int main() {A a; a.f();}");
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ASSERT_EQUALS("", errout.str());
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}
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void unusedError() {
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check("void foo() {}\n"
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"int main()");
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ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout.str());
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check("void foo() const {}\n"
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"int main()");
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ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout.str());
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check("void foo() const throw() {}\n"
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"int main()");
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ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout.str());
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check("void foo() throw() {}\n"
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"int main()");
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ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout.str());
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}
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void unusedMain() {
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check("int main() { }");
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ASSERT_EQUALS("", errout.str());
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}
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void initializationIsNotAFunction() {
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check("struct B: N::A {\n"
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" B(): N::A() {};\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void operator1() {
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check("struct Foo { void operator()(int a) {} };");
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ASSERT_EQUALS("", errout.str());
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check("struct Foo { operator std::string(int a) {} };");
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ASSERT_EQUALS("", errout.str());
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}
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void operator2() { // #7974
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check("bool operator==(const data_t& a, const data_t& b) {\n"
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" return (a.fd == b.fd);\n"
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"}\n"
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"bool operator==(const event& a, const event& b) {\n"
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" return ((a.events == b.events) && (a.data == b.data));\n"
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"}\n"
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"int main(event a, event b) {\n"
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" return a == b;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void returnRef() {
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check("int& foo() {return x;}");
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ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout.str());
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}
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void attribute() { // #3471 - FP __attribute__((constructor))
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check("void __attribute__((constructor)) f() {}");
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ASSERT_EQUALS("", errout.str());
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check("void __attribute__((constructor(1000))) f() {}");
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ASSERT_EQUALS("", errout.str());
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check("void __attribute__((destructor)) f() {}");
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ASSERT_EQUALS("", errout.str());
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check("void __attribute__((destructor(1000))) f() {}");
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ASSERT_EQUALS("", errout.str());
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// alternate syntax
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check("__attribute__((constructor)) void f() {}");
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ASSERT_EQUALS("", errout.str());
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check("__attribute__((constructor(1000))) void f() {}");
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ASSERT_EQUALS("", errout.str());
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check("__attribute__((destructor)) void f() {}");
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ASSERT_EQUALS("", errout.str());
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check("__attribute__((destructor(1000))) void f() {}");
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ASSERT_EQUALS("", errout.str());
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// alternate syntax
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check("void f() __attribute__((constructor));\n"
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"void f() { }");
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ASSERT_EQUALS("", errout.str());
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check("void f() __attribute__((constructor(1000)));\n"
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"void f() { }");
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ASSERT_EQUALS("", errout.str());
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check("void f() __attribute__((destructor));\n"
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"void f() { }");
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ASSERT_EQUALS("", errout.str());
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check("void f() __attribute__((destructor(1000)));\n"
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"void f() { }");
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ASSERT_EQUALS("", errout.str());
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// Don't crash on wrong syntax
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check("int x __attribute__((constructor));\n"
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"int y __attribute__((destructor));");
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// #10661
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check("extern \"C\" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t dataSize) { return 0; }\n");
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ASSERT_EQUALS("", errout.str());
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}
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void initializer_list() {
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check("int foo() { return 0; }\n"
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"struct A {\n"
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" A() : m_i(foo())\n"
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" {}\n"
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"int m_i;\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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// #8580
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check("int foo() { return 12345; }\n"
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"int bar(std::function<int()> func) { return func(); }\n"
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"\n"
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"class A {\n"
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"public:\n"
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" A() : a(bar([] { return foo(); })) {}\n"
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" const int a;\n"
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"};");
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ASSERT_EQUALS("", errout.str());
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}
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void member_function_ternary() {
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check("struct Foo {\n"
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" void F1() {}\n"
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" void F2() {}\n"
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"};\n"
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"int main(int argc, char *argv[]) {\n"
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" Foo foo;\n"
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" void (Foo::*ptr)();\n"
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" ptr = (argc > 1 && !strcmp(argv[1], \"F2\")) ? &Foo::F2 : &Foo::F1;\n"
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" (foo.*ptr)();\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void boost() {
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check("static void _xy(const char *b, const char *e)\n"
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"{}\n"
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"parse(line, blanks_p >> ident[&_xy] >> blanks_p >> eol_p).full");
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ASSERT_EQUALS("", errout.str());
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}
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void enumValues() { // #11486
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check("enum E1 { Break1 };\n"
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"struct S {\n"
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" enum class E { Break };\n"
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" void Break() {}\n"
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" void Break1() {}\n"
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"};\n");
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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)
|