/* * cppcheck - c/c++ syntax checking * Copyright (C) 2007-2009 Daniel Marjamäki, Reijo Tomperi, Nicolas Le Cam * * 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 extern std::ostringstream errout; class TestUnusedVar : public TestFixture { public: TestUnusedVar() : TestFixture("TestUnusedVar") { } private: void check(const char code[]) { // Tokenize.. Tokenizer tokenizer; std::istringstream istr(code); tokenizer.tokenize(istr, "test.cpp"); tokenizer.simplifyTokenList(); // Clear the error buffer.. errout.str(""); // Check for unused variables.. CheckOther checkOther(&tokenizer, Settings(), this); checkOther.CheckStructMemberUsage(); } void run() { TEST_CASE(structmember1); TEST_CASE(structmember2); TEST_CASE(structmember3); TEST_CASE(structmember4); TEST_CASE(structmember5); TEST_CASE(localvar1); TEST_CASE(localvar2); TEST_CASE(localvar3); TEST_CASE(localvar4); TEST_CASE(localvar5); // Don't give false positives for variables in structs/unions TEST_CASE(localvarStruct1); TEST_CASE(localvarStruct2); TEST_CASE(localvarStruct3); TEST_CASE(localvarStruct4); // Ticket #31: sigsegv on incomplete struct TEST_CASE(localvarOp); // Usage with arithmetic operators TEST_CASE(localvarInvert); // Usage with inverted variable TEST_CASE(localvarIf); // Usage in if TEST_CASE(localvarIfElse); // return tmp1 ? tmp2 : tmp3; TEST_CASE(localvarOpAssign); // a |= b; TEST_CASE(localvarFor); // for ( ; var; ) TEST_CASE(localvarShift); // 1 >> var } void structmember1() { check("struct abc\n" "{\n" " int a;\n" " int b;\n" " int c;\n" "};\n"); ASSERT_EQUALS(std::string("[test.cpp:3]: struct or union member 'abc::a' is never used\n" "[test.cpp:4]: struct or union member 'abc::b' is never used\n" "[test.cpp:5]: struct or union member 'abc::c' is never used\n"), errout.str()); } void structmember2() { check("struct ABC\n" "{\n" " int a;\n" " int b;\n" " int c;\n" "};\n" "\n" "void foo()\n" "{\n" " struct ABC abc;\n" " int a = abc.a;\n" " int b = abc.b;\n" " int c = abc.c;\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void structmember3() { check("struct ABC\n" "{\n" " int a;\n" " int b;\n" " int c;\n" "};\n" "\n" "static struct ABC abc[] = { {1, 2, 3} };\n" "\n" "void foo()\n" "{\n" " int a = abc[0].a;\n" " int b = abc[0].b;\n" " int c = abc[0].c;\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void structmember4() { check("struct ABC\n" "{\n" " const int a;\n" "};\n" "\n" "void foo()\n" "{\n" " ABC abc;\n" " if (abc.a == 2);\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void structmember5() { check("struct AB\n" "{\n" " int a;\n" " int b;\n" " void reset()\n" " {\n" " a = 1;\n" " b = 2;\n" " }\n" "};\n" "\n" "void foo()\n" "{\n" " struct AB ab;\n" " ab.reset();\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void functionVariableUsage(const char code[]) { // Tokenize.. Tokenizer tokenizer; std::istringstream istr(code); tokenizer.tokenize(istr, "test.cpp"); tokenizer.simplifyTokenList(); // Clear the error buffer.. errout.str(""); // Check for unused variables.. CheckOther checkOther(&tokenizer, Settings(), this); checkOther.functionVariableUsage(); } void localvar1() { functionVariableUsage("void foo()\n" "{\n" " int i = 0;\n" "}\n"); ASSERT_EQUALS(std::string("[test.cpp:2]: Variable 'i' is assigned a value that is never used\n"), errout.str()); } void localvar2() { functionVariableUsage("void foo()\n" "{\n" " int i;\n" " return i;\n" "}\n"); ASSERT_EQUALS(std::string("[test.cpp:2]: Variable 'i' is not assigned a value\n"), errout.str()); } void localvar3() { functionVariableUsage("void foo()\n" "{\n" " int i;\n" " if ( abc )\n" " ;\n" " else i = 0;\n" "}\n"); ASSERT_EQUALS(std::string("[test.cpp:2]: Variable 'i' is assigned a value that is never used\n"), errout.str()); } void localvar4() { functionVariableUsage("void foo()\n" "{\n" " int i = 0;\n" " f(i);\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void localvar5() { functionVariableUsage("void foo()\n" "{\n" " int a = 0;\n" " b = (char)a;\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void localvarStruct1() { functionVariableUsage("void foo()\n" "{\n" " static const struct{ int x, y, w, h; } bounds = {1,2,3,4};\n" " return bounds.x + bounds.y + bounds.w + bounds.h;\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void localvarStruct2() { functionVariableUsage("void foo()\n" "{\n" " struct ABC { int a, b, c; };\n" " struct ABC abc = { 1, 2, 3 };\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void localvarStruct3() { functionVariableUsage("void foo()\n" "{\n" " int a = 10;\n" " union { struct { unsigned char x; }; unsigned char z; };\n" " do {\n" " func();\n" " } while(a--);\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void localvarStruct4() { /* This must not SIGSEGV: */ functionVariableUsage("void foo()\n" "{\n" " struct { \n"); errout.str(); } void localvarOp() { const char op[] = "+-*/%&|^"; for (const char *p = op; *p; ++p) { std::string code("int main()\n" "{\n" " int tmp = 10;\n" " return 123 " + std::string(1, *p) + " tmp;\n" "}\n"); functionVariableUsage(code.c_str()); ASSERT_EQUALS(std::string(""), errout.str()); } } void localvarInvert() { functionVariableUsage("int main()\n" "{\n" " int tmp = 10;\n" " return ~tmp;\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void localvarIf() { functionVariableUsage("int main()\n" "{\n" " int tmp = 10;\n" " if ( tmp )\n" " return 1;\n" " return 0;\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void localvarIfElse() { functionVariableUsage("int foo()\n" "{\n" " int tmp1 = 1;\n" " int tmp2 = 2;\n" " int tmp3 = 3;\n" " return tmp1 ? tmp2 : tmp3;\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void localvarOpAssign() { functionVariableUsage("void foo()\n" "{\n" " int a = 1;\n" " int b = 2;\n" " a |= b;\n" "}\n"); ASSERT_EQUALS(std::string("[test.cpp:2]: Variable 'a' is assigned a value that is never used\n"), errout.str()); } void localvarFor() { functionVariableUsage("void foo()\n" "{\n" " int a = 1;\n" " for (;a;);\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } void localvarShift() { functionVariableUsage("int foo()\n" "{\n" " int var = 1;\n" " return 1 >> var;\n" "}\n"); ASSERT_EQUALS(std::string(""), errout.str()); } }; REGISTER_TEST(TestUnusedVar)