503 lines
15 KiB
C++
503 lines
15 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2010 Daniel Marjamäki and 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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// Check for unused variables..
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#include "testsuite.h"
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#include "tokenize.h"
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#include "checkother.h"
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#include <sstream>
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extern std::ostringstream errout;
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class TestUnusedVar : public TestFixture
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{
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public:
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TestUnusedVar() : TestFixture("TestUnusedVar")
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{ }
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private:
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void check(const char code[])
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{
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// Tokenize..
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Tokenizer tokenizer;
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std::istringstream istr(code);
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tokenizer.tokenize(istr, "test.cpp");
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// Clear the error buffer..
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errout.str("");
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// Check for unused variables..
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Settings settings;
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CheckOther checkOther(&tokenizer, &settings, this);
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checkOther.checkStructMemberUsage();
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}
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void run()
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{
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TEST_CASE(structmember1);
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TEST_CASE(structmember2);
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TEST_CASE(structmember3);
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TEST_CASE(structmember4);
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TEST_CASE(structmember5);
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TEST_CASE(structmember6);
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TEST_CASE(structmember7);
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TEST_CASE(structmember8);
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TEST_CASE(localvar1);
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TEST_CASE(localvar2);
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TEST_CASE(localvar3);
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TEST_CASE(localvar4);
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TEST_CASE(localvar5);
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TEST_CASE(localvar6);
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TEST_CASE(localvar7);
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TEST_CASE(localvarasm);
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// Don't give false positives for variables in structs/unions
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TEST_CASE(localvarStruct1);
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TEST_CASE(localvarStruct2);
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TEST_CASE(localvarStruct3);
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TEST_CASE(localvarStruct4); // Ticket #31: sigsegv on incomplete struct
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TEST_CASE(localvarOp); // Usage with arithmetic operators
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TEST_CASE(localvarInvert); // Usage with inverted variable
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TEST_CASE(localvarIf); // Usage in if
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TEST_CASE(localvarIfElse); // return tmp1 ? tmp2 : tmp3;
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TEST_CASE(localvarOpAssign); // a |= b;
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TEST_CASE(localvarFor); // for ( ; var; )
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TEST_CASE(localvarShift); // 1 >> var
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}
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void structmember1()
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{
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check("struct abc\n"
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"{\n"
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" int a;\n"
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" int b;\n"
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" int c;\n"
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"};\n");
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ASSERT_EQUALS(std::string("[test.cpp:3]: (style) struct or union member 'abc::a' is never used\n"
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"[test.cpp:4]: (style) struct or union member 'abc::b' is never used\n"
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"[test.cpp:5]: (style) struct or union member 'abc::c' is never used\n"), errout.str());
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}
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void structmember2()
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{
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check("struct ABC\n"
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"{\n"
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" int a;\n"
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" int b;\n"
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" int c;\n"
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"};\n"
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"\n"
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"void foo()\n"
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"{\n"
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" struct ABC abc;\n"
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" int a = abc.a;\n"
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" int b = abc.b;\n"
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" int c = abc.c;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void structmember3()
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{
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check("struct ABC\n"
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"{\n"
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" int a;\n"
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" int b;\n"
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" int c;\n"
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"};\n"
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"\n"
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"static struct ABC abc[] = { {1, 2, 3} };\n"
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"\n"
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"void foo()\n"
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"{\n"
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" int a = abc[0].a;\n"
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" int b = abc[0].b;\n"
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" int c = abc[0].c;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void structmember4()
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{
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check("struct ABC\n"
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"{\n"
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" const int a;\n"
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"};\n"
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"\n"
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"void foo()\n"
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"{\n"
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" ABC abc;\n"
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" if (abc.a == 2);\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void structmember5()
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{
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check("struct AB\n"
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"{\n"
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" int a;\n"
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" int b;\n"
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" void reset()\n"
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" {\n"
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" a = 1;\n"
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" b = 2;\n"
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" }\n"
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"};\n"
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"\n"
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"void foo()\n"
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"{\n"
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" struct AB ab;\n"
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" ab.reset();\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void structmember6()
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{
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check("struct AB\n"
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"{\n"
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" int a;\n"
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" int b;\n"
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"};\n"
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"\n"
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"void foo(char *buf)\n"
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"{\n"
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" struct AB *ab = (struct AB *)&buf[10];\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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check("struct AB\n"
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"{\n"
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" int a;\n"
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" int b;\n"
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"};\n"
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"\n"
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"void foo(char *buf)\n"
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"{\n"
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" struct AB *ab = (AB *)&buf[10];\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void structmember7()
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{
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check("struct AB\n"
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"{\n"
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" int a;\n"
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" int b;\n"
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"};\n"
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"\n"
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"void foo(struct AB *ab)\n"
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"{\n"
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" ab->a = 0;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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check("struct AB\n"
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"{\n"
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" int a;\n"
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" int b;\n"
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"};\n"
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"\n"
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"void foo(struct AB _shuge *ab)\n"
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"{\n"
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" ab->a = 0;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void structmember8()
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{
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check("struct AB\n"
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"{\n"
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" int a;\n"
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" int b;\n"
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"};\n"
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"\n"
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"void foo(char *ab)\n"
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"{\n"
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" ((AB *)ab)->b = 0;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void functionVariableUsage(const char code[])
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{
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// Tokenize..
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Tokenizer tokenizer;
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std::istringstream istr(code);
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tokenizer.tokenize(istr, "test.cpp");
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// Clear the error buffer..
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errout.str("");
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// Check for unused variables..
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Settings settings;
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CheckOther checkOther(&tokenizer, &settings, this);
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checkOther.functionVariableUsage();
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}
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void localvar1()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" int i = 0;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
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}
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void localvar2()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" int i;\n"
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" return i;\n"
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"}\n");
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ASSERT_EQUALS(std::string("[test.cpp:2]: (style) Variable 'i' is not assigned a value\n"), errout.str());
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}
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void localvar3()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" int i;\n"
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" if ( abc )\n"
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" ;\n"
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" else i = 0;\n"
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"}\n");
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ASSERT_EQUALS(std::string("[test.cpp:2]: (style) Variable 'i' is assigned a value that is never used\n"), errout.str());
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}
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void localvar4()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" int i = 0;\n"
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" f(i);\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void localvar5()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" int a = 0;\n"
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" b = (char)a;\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void localvar6()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" int a = 0;\n"
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" int b[10];\n"
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" for (int i=0;i<10;++i)\n"
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" b[i] = ++a;\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void localvar7()// ticket 1253
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" int i;\n"
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" i--;\n"
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"}\n");
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ASSERT_EQUALS(std::string("[test.cpp:2]: (style) Unused variable: i\n"), errout.str());
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functionVariableUsage("void foo()\n"
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"{\n"
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" int i;\n"
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" int &ii(i);"
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" ii--;\n"
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"}\n");
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TODO_ASSERT_EQUALS(std::string("[test.cpp:2]: (style) Variable 'i' is not assigned a value\n"), errout.str());
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functionVariableUsage("void foo()\n"
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"{\n"
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" int i;\n"
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" int &ii=i;"
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" ii--;\n"
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"}\n");
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ASSERT_EQUALS(std::string("[test.cpp:2]: (style) Variable 'i' is not assigned a value\n"), errout.str());
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}
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void localvarasm()
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{
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functionVariableUsage("void foo(int &b)\n"
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"{\n"
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" int a;\n"
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" asm();\n"
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" b = a;\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void localvarStruct1()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" static const struct{ int x, y, w, h; } bounds = {1,2,3,4};\n"
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" return bounds.x + bounds.y + bounds.w + bounds.h;\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void localvarStruct2()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" struct ABC { int a, b, c; };\n"
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" struct ABC abc = { 1, 2, 3 };\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void localvarStruct3()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" int a = 10;\n"
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" union { struct { unsigned char x; }; unsigned char z; };\n"
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" do {\n"
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" func();\n"
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" } while(a--);\n"
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"}\n");
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ASSERT_EQUALS(std::string("[test.cpp:2]: (style) Unused variable: z\n"), errout.str());
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}
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void localvarStruct4()
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{
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/* This must not SIGSEGV: */
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// FIXME!!
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//functionVariableUsage("void foo()\n"
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// "{\n"
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// " struct { \n");
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}
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void localvarOp()
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{
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const char op[] = "+-*/%&|^";
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for (const char *p = op; *p; ++p)
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{
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std::string code("int main()\n"
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"{\n"
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" int tmp = 10;\n"
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" return 123 " + std::string(1, *p) + " tmp;\n"
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"}\n");
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functionVariableUsage(code.c_str());
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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}
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void localvarInvert()
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{
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functionVariableUsage("int main()\n"
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"{\n"
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" int tmp = 10;\n"
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" return ~tmp;\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void localvarIf()
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{
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functionVariableUsage("int main()\n"
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"{\n"
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" int tmp = 10;\n"
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" if ( tmp )\n"
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" return 1;\n"
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" return 0;\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void localvarIfElse()
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{
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functionVariableUsage("int foo()\n"
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"{\n"
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" int tmp1 = 1;\n"
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" int tmp2 = 2;\n"
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" int tmp3 = 3;\n"
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" return tmp1 ? tmp2 : tmp3;\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void localvarOpAssign()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" int a = 1;\n"
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" int b = 2;\n"
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" a |= b;\n"
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"}\n");
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ASSERT_EQUALS(std::string("[test.cpp:2]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
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}
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void localvarFor()
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{
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functionVariableUsage("void foo()\n"
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"{\n"
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" int a = 1;\n"
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" for (;a;);\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void localvarShift()
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{
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functionVariableUsage("int foo()\n"
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"{\n"
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" int var = 1;\n"
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" return 1 >> var;\n"
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"}\n");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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};
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REGISTER_TEST(TestUnusedVar)
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