710 lines
24 KiB
C++
710 lines
24 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 "helpers.h"
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#include "platform.h"
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#include "preprocessor.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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#include <string>
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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(template10);
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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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TEST_CASE(includes);
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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, 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 template10() {
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check("template<typename T>\n" // #12013, don't crash
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"struct S {\n"
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" static const int digits = std::numeric_limits<T>::digits;\n"
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" using type = std::conditional<digits < 32, std::int32_t, std::int64_t>::type;\n"
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"};\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");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void enumValues() { // #11486
|
|
check("enum E1 { Break1 };\n"
|
|
"struct S {\n"
|
|
" enum class E { Break };\n"
|
|
" void Break() {}\n"
|
|
" void Break1() {}\n"
|
|
"};\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (style) The function 'Break' is never used.\n"
|
|
"[test.cpp:5]: (style) The function 'Break1' is never used.\n",
|
|
errout.str());
|
|
}
|
|
|
|
void multipleFiles() {
|
|
Tokenizer tokenizer(&settings, this);
|
|
CheckUnusedFunctions c(&tokenizer, &settings, nullptr);
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
const char code[] = "static void f() { }";
|
|
|
|
for (int i = 1; i <= 2; ++i) {
|
|
std::ostringstream fname;
|
|
fname << "test" << i << ".cpp";
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
Tokenizer tokenizer2(&settings, this);
|
|
std::istringstream istr(code);
|
|
ASSERT(tokenizer2.tokenize(istr, fname.str().c_str()));
|
|
|
|
c.parseTokens(tokenizer2, "someFile.c", &settings);
|
|
}
|
|
|
|
// Check for unused functions..
|
|
(c.check)(this, settings);
|
|
|
|
ASSERT_EQUALS("[test1.cpp:1]: (style) The function 'f' is never used.\n", errout.str());
|
|
}
|
|
|
|
void lineNumber() {
|
|
check("void foo();\n"
|
|
"void bar() {}\n"
|
|
"int main() {}");
|
|
ASSERT_EQUALS("[test.cpp:2]: (style) The function 'bar' is never used.\n", errout.str());
|
|
}
|
|
|
|
void ignore_declaration() {
|
|
check("void f();\n"
|
|
"void f() {}");
|
|
ASSERT_EQUALS("[test.cpp:2]: (style) The function 'f' is never used.\n", errout.str());
|
|
|
|
check("void f(void) {}\n"
|
|
"void (*list[])(void) = {f}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void operatorOverload() {
|
|
check("class A {\n"
|
|
"private:\n"
|
|
" friend std::ostream & operator<<(std::ostream &, const A&);\n"
|
|
"};\n"
|
|
"std::ostream & operator<<(std::ostream &os, const A&) {\n"
|
|
" os << \"This is class A\";\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("class A{};\n"
|
|
"A operator + (const A &, const A &){ return A(); }\n"
|
|
"A operator - (const A &, const A &){ return A(); }\n"
|
|
"A operator * (const A &, const A &){ return A(); }\n"
|
|
"A operator / (const A &, const A &){ return A(); }\n"
|
|
"A operator % (const A &, const A &){ return A(); }\n"
|
|
"A operator & (const A &, const A &){ return A(); }\n"
|
|
"A operator | (const A &, const A &){ return A(); }\n"
|
|
"A operator ~ (const A &){ return A(); }\n"
|
|
"A operator ! (const A &){ return A(); }\n"
|
|
"bool operator < (const A &, const A &){ return true; }\n"
|
|
"bool operator > (const A &, const A &){ return true; }\n"
|
|
"A operator += (const A &, const A &){ return A(); }\n"
|
|
"A operator -= (const A &, const A &){ return A(); }\n"
|
|
"A operator *= (const A &, const A &){ return A(); }\n"
|
|
"A operator /= (const A &, const A &){ return A(); }\n"
|
|
"A operator %= (const A &, const A &){ return A(); }\n"
|
|
"A operator &= (const A &, const A &){ return A(); }\n"
|
|
"A operator ^= (const A &, const A &){ return A(); }\n"
|
|
"A operator |= (const A &, const A &){ return A(); }\n"
|
|
"A operator << (const A &, const int){ return A(); }\n"
|
|
"A operator >> (const A &, const int){ return A(); }\n"
|
|
"A operator <<= (const A &, const int){ return A(); }\n"
|
|
"A operator >>= (const A &, const int){ return A(); }\n"
|
|
"bool operator == (const A &, const A &){ return true; }\n"
|
|
"bool operator != (const A &, const A &){ return true; }\n"
|
|
"bool operator <= (const A &, const A &){ return true; }\n"
|
|
"bool operator >= (const A &, const A &){ return true; }\n"
|
|
"A operator && (const A &, const int){ return A(); }\n"
|
|
"A operator || (const A &, const int){ return A(); }\n"
|
|
"A operator ++ (const A &, const int){ return A(); }\n"
|
|
"A operator ++ (const A &){ return A(); }\n"
|
|
"A operator -- (const A &, const int){ return A(); }\n"
|
|
"A operator -- (const A &){ return A(); }\n"
|
|
"A operator , (const A &, const A &){ return A(); }");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
|
|
check("class A {\n"
|
|
"public:\n"
|
|
" static void * operator new(std::size_t);\n"
|
|
" static void * operator new[](std::size_t);\n"
|
|
"};\n"
|
|
"void * A::operator new(std::size_t s) {\n"
|
|
" return malloc(s);\n"
|
|
"}\n"
|
|
"void * A::operator new[](std::size_t s) {\n"
|
|
" return malloc(s);\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void entrypointsWin() {
|
|
check("int WinMain() { }");
|
|
ASSERT_EQUALS("[test.cpp:1]: (style) The function 'WinMain' is never used.\n", errout.str());
|
|
|
|
check("int _tmain() { }");
|
|
ASSERT_EQUALS("[test.cpp:1]: (style) The function '_tmain' is never used.\n", errout.str());
|
|
|
|
const Settings s = settingsBuilder(settings).library("windows.cfg").build();
|
|
|
|
check("int WinMain() { }", Platform::Type::Native, &s);
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("int _tmain() { }", 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() { }", Platform::Type::Native, &s);
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("int _tmain() { }", 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", Platform::Type::Native, &s);
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
// TODO: fails because the location information is not be preserved by PreprocessorHelper::getcode()
|
|
void includes()
|
|
{
|
|
// #11483
|
|
const char inc[] = "class A {\n"
|
|
"public:\n"
|
|
" void f() {}\n"
|
|
"};";
|
|
const char code[] = R"(#include "test.h")";
|
|
ScopedFile header("test.h", inc);
|
|
Preprocessor preprocessor(settings, this);
|
|
const std::string processed = PreprocessorHelper::getcode(preprocessor, code, "", "test.cpp");
|
|
check(processed.c_str());
|
|
TODO_ASSERT_EQUALS("[test.h:3]: (style) The function 'f' is never used.\n", "[test.cpp:3]: (style) The function 'f' is never used.\n", errout.str());
|
|
}
|
|
};
|
|
|
|
REGISTER_TEST(TestUnusedFunctions)
|