cppcheck/test/testunusedfunctions.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2013 Daniel Marjamäki and Cppcheck team.
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*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "tokenize.h"
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#include "testsuite.h"
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#include "checkunusedfunctions.h"
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#include <sstream>
extern std::ostringstream errout;
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class TestUnusedFunctions : public TestFixture {
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public:
TestUnusedFunctions() : TestFixture("TestUnusedFunctions") {
}
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private:
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void run() {
TEST_CASE(incondition);
TEST_CASE(return1);
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TEST_CASE(return2);
TEST_CASE(callback1);
TEST_CASE(else1);
TEST_CASE(functionpointer);
TEST_CASE(template1);
TEST_CASE(template2);
TEST_CASE(throwIsNotAFunction);
TEST_CASE(unusedError);
TEST_CASE(unusedMain);
TEST_CASE(initializationIsNotAFunction);
TEST_CASE(operator1); // #3195
TEST_CASE(returnRef);
TEST_CASE(multipleFiles); // same function name in multiple files
TEST_CASE(lineNumber); // Ticket 3059
TEST_CASE(ignore_declaration); // ignore declaration
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}
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void check(const char code[]) {
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// Clear the error buffer..
errout.str("");
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Settings settings;
settings.addEnabled("style");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check for unused functions..
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CheckUnusedFunctions checkUnusedFunctions(&tokenizer, &settings, this);
checkUnusedFunctions.parseTokens(tokenizer);
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checkUnusedFunctions.check(this);
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}
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void incondition() {
check("int f1()\n"
"{\n"
" if (f1())\n"
" { }\n"
"}");
ASSERT_EQUALS("", errout.str());
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}
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void return1() {
check("int f1()\n"
"{\n"
" return f1();\n"
"}");
ASSERT_EQUALS("", errout.str());
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}
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void return2() {
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check("char * foo()\n"
"{\n"
" return *foo();\n"
"}");
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ASSERT_EQUALS("", errout.str());
}
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void callback1() {
check("void f1()\n"
"{\n"
" void (*f)() = cond ? f1 : NULL;\n"
"}");
ASSERT_EQUALS("", errout.str());
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}
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void else1() {
check("void f1()\n"
"{\n"
" if (cond) ;\n"
" else f1();\n"
"}");
ASSERT_EQUALS("", errout.str());
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}
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void functionpointer() {
check("namespace abc {\n"
"void foo() { }\n"
"};\n"
"\n"
"int main()\n"
"{\n"
" f(&abc::foo);\n"
" return 0\n"
"}");
ASSERT_EQUALS("", errout.str());
check("namespace abc {\n"
"void foo() { }\n"
"};\n"
"\n"
"int main()\n"
"{\n"
" f = &abc::foo;\n"
" return 0\n"
"}");
ASSERT_EQUALS("", errout.str());
check("namespace abc {\n" // #3875
"void foo() { }\n"
"};\n"
"\n"
"int main()\n"
"{\n"
" f(abc::foo);\n"
" return 0\n"
"}");
ASSERT_EQUALS("", errout.str());
}
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void template1() {
check("template<class T> void foo() { }\n"
"\n"
"int main()\n"
"{\n"
" foo<int>();\n"
" return 0\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void template2() {
check("void f() { }\n"
"\n"
"template<class T> void g()\n"
"{\n"
" f();\n"
"}");
ASSERT_EQUALS("", errout.str());
}
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void throwIsNotAFunction() {
check("struct A {void f() const throw () {}}; int main() {A a; a.f();}");
ASSERT_EQUALS("", errout.str());
}
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void unusedError() {
check("void foo() {}\n"
"int main()\n");
ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout.str());
check("void foo() const {}\n"
"int main()\n");
ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout.str());
check("void foo() const throw() {}\n"
"int main()\n");
ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout.str());
check("void foo() throw() {}\n"
"int main()\n");
ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout.str());
}
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void unusedMain() {
check("int main() { }");
ASSERT_EQUALS("", errout.str());
check("int _tmain() { }");
ASSERT_EQUALS("", errout.str());
check("int WinMain() { }");
ASSERT_EQUALS("", errout.str());
}
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void initializationIsNotAFunction() {
check("struct B: N::A {\n"
" B(): N::A() {};\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void operator1() {
check("struct Foo { void operator()(int a) {} };");
ASSERT_EQUALS("", errout.str());
}
void returnRef() {
check("int& foo() {return x;}");
ASSERT_EQUALS("[test.cpp:1]: (style) The function 'foo' is never used.\n", errout.str());
}
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void multipleFiles() {
CheckUnusedFunctions c;
// Clear the error buffer..
errout.str("");
const char code[] = "static void f() { }";
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for (int i = 1; i <= 2; ++i) {
std::ostringstream fname;
fname << "test" << i << ".cpp";
// Clear the error buffer..
errout.str("");
Settings settings;
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, fname.str().c_str());
c.parseTokens(tokenizer);
}
// Check for unused functions..
c.check(this);
ASSERT_EQUALS("[test1.cpp:1]: (style) The function 'f' is never used.\n", errout.str());
}
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void lineNumber() {
check("void foo() {}\n"
"void bar() {}\n"
"int main()\n");
ASSERT_EQUALS("[test.cpp:2]: (style) The function 'bar' is never used.\n"
"[test.cpp:1]: (style) The function 'foo' 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());
}
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};
REGISTER_TEST(TestUnusedFunctions)