/* * Cppcheck - A tool for static C/C++ code analysis * Copyright (C) 2007-2010 Daniel Marjamäki and Cppcheck team. * * 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 . */ // Check for unused variables.. #include "testsuite.h" #include "tokenize.h" #include "checkother.h" #include extern std::ostringstream errout; class TestUnusedVar : public TestFixture { public: TestUnusedVar() : TestFixture("TestUnusedVar") { } private: void run() { TEST_CASE(structmember1); TEST_CASE(structmember2); TEST_CASE(structmember3); TEST_CASE(structmember4); TEST_CASE(structmember5); TEST_CASE(structmember6); TEST_CASE(structmember7); TEST_CASE(structmember8); TEST_CASE(structmember9); // #2017 - struct is inherited TEST_CASE(structmember_extern); // No false positives for extern structs TEST_CASE(structmember10); TEST_CASE(localvar1); TEST_CASE(localvar2); TEST_CASE(localvar3); TEST_CASE(localvar4); TEST_CASE(localvar5); TEST_CASE(localvar6); TEST_CASE(localvar7); TEST_CASE(localvar8); TEST_CASE(localvar9); // ticket #1605 TEST_CASE(localvar10); TEST_CASE(localvar11); TEST_CASE(localvar12); TEST_CASE(localvar13); // ticket #1640 TEST_CASE(localvar14); // ticket #5 TEST_CASE(localvar15); TEST_CASE(localvar16); // ticket #1709 TEST_CASE(localvar17); // ticket #1720 TEST_CASE(localvar18); // ticket #1723 TEST_CASE(localvar19); // ticket #1776 TEST_CASE(localvar20); // ticket #1799 TEST_CASE(localvar21); // ticket #1807 TEST_CASE(localvar22); // ticket #1811 TEST_CASE(localvar23); // ticket #1808 TEST_CASE(localvar24); // ticket #1803 TEST_CASE(localvar25); // ticket #1729 TEST_CASE(localvar26); // ticket #1894 TEST_CASE(localvar27); // ticket #2160 TEST_CASE(localvar28); // ticket #2205 TEST_CASE(localvar29); // ticket #2206 (array initialization) TEST_CASE(localvar30); TEST_CASE(localvar31); // ticket #2286 TEST_CASE(localvar32); // ticket #2330 TEST_CASE(localvaralias1); TEST_CASE(localvaralias2); // ticket #1637 TEST_CASE(localvaralias3); // ticket #1639 TEST_CASE(localvaralias4); // ticket #1643 TEST_CASE(localvaralias5); // ticket #1647 TEST_CASE(localvaralias6); // ticket #1729 TEST_CASE(localvaralias7); // ticket #1732 TEST_CASE(localvaralias8); TEST_CASE(localvaralias9); // ticket #1996 TEST_CASE(localvaralias10); // ticket #2004 TEST_CASE(localvarasm); TEST_CASE(localvarstatic); TEST_CASE(localvardynamic); // 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(localvarShift1); // 1 >> var TEST_CASE(localvarShift2); // x = x >> 1 TEST_CASE(localvarCast); TEST_CASE(localvarClass); TEST_CASE(localvarUnused); TEST_CASE(localvarFunction); // ticket #1799 } void checkStructMemberUsage(const char code[]) { // Clear the error buffer.. errout.str(""); Settings settings; settings._checkCodingStyle = true; // Tokenize.. Tokenizer tokenizer(&settings, this); std::istringstream istr(code); tokenizer.tokenize(istr, "test.cpp"); // Check for unused variables.. CheckOther checkOther(&tokenizer, &settings, this); checkOther.checkStructMemberUsage(); } void structmember1() { checkStructMemberUsage("struct abc\n" "{\n" " int a;\n" " int b;\n" " int c;\n" "};\n"); ASSERT_EQUALS("[test.cpp:3]: (style) struct or union member 'abc::a' is never used\n" "[test.cpp:4]: (style) struct or union member 'abc::b' is never used\n" "[test.cpp:5]: (style) struct or union member 'abc::c' is never used\n", errout.str()); } void structmember2() { checkStructMemberUsage("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("", errout.str()); } void structmember3() { checkStructMemberUsage("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("", errout.str()); } void structmember4() { checkStructMemberUsage("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("", errout.str()); } void structmember5() { checkStructMemberUsage("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("", errout.str()); } void structmember6() { checkStructMemberUsage("struct AB\n" "{\n" " int a;\n" " int b;\n" "};\n" "\n" "void foo(char *buf)\n" "{\n" " struct AB *ab = (struct AB *)&buf[10];\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct AB\n" "{\n" " int a;\n" " int b;\n" "};\n" "\n" "void foo(char *buf)\n" "{\n" " struct AB *ab = (AB *)&buf[10];\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void structmember7() { checkStructMemberUsage("struct AB\n" "{\n" " int a;\n" " int b;\n" "};\n" "\n" "void foo(struct AB *ab)\n" "{\n" " ab->a = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct AB\n" "{\n" " int a;\n" " int b;\n" "};\n" "\n" "void foo(struct AB _shuge *ab)\n" "{\n" " ab->a = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void structmember8() { checkStructMemberUsage("struct AB\n" "{\n" " int a;\n" " int b;\n" "};\n" "\n" "void foo(char *ab)\n" "{\n" " ((AB *)ab)->b = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void structmember9() { checkStructMemberUsage("struct base {\n" " int a;\n" "};\n" "\n" "struct derived : public base {" "}\n"); ASSERT_EQUALS("", errout.str()); } void structmember10() { // Fred may have some useful side-effects checkStructMemberUsage("struct abc {\n" " Fred fred;\n" "};\n"); ASSERT_EQUALS("", errout.str()); } void structmember_extern() { // extern struct => no false positive checkStructMemberUsage("extern struct AB\n" "{\n" " int a;\n" " int b;\n" "} ab;\n" "\n" "void foo()\n" "{\n" " ab.b = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); // global linkage => no false positive checkStructMemberUsage("struct AB\n" "{\n" " int a;\n" " int b;\n" "} ab;\n" "\n" "void foo()\n" "{\n" " ab.b = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); // static linkage => error message checkStructMemberUsage("static struct AB\n" "{\n" " int a;\n" " int b;\n" "} ab;\n" "\n" "void foo()\n" "{\n" " ab.b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) struct or union member 'AB::a' is never used\n", errout.str()); } void functionVariableUsage(const char code[]) { // Clear the error buffer.. errout.str(""); Settings settings; settings._checkCodingStyle = true; // Tokenize.. Tokenizer tokenizer(&settings, this); std::istringstream istr(code); tokenizer.tokenize(istr, "test.cpp"); // 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("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i(0);\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); // if a is undefined then Cppcheck can't determine if "int i(a)" is a // * variable declaration // * function declaration functionVariableUsage("void foo()\n" "{\n" " int i(a);\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int j = 0;\n" " int i(j);\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int j = 0;\n" " int & i = j;\n" " j = j;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int j = 0;\n" " const int & i = j;\n" " j = j;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int j = 0;\n" " int & i(j);\n" " j = j;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int j = 0;\n" " const int & i(j);\n" " j = j;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int * j = 0;\n" " int * i(j);\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int * j = 0;\n" " const int * i(j);\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " bool i = false;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " bool i = true;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char *i;\n" " i = fgets();\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); // undefined variables are not reported because they may be classes with constructors functionVariableUsage("undefined foo()\n" "{\n" " undefined i = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i = undefined;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int * i = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " void * i = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " const void * i = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " struct S * i = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " const struct S * i = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " struct S & i = j;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " const struct S & i = j;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " undefined * i = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i = 0;\n" " int j = i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'j' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i[10] = { 0 };\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo(int n)\n" "{\n" " int i[n] = { 0 };\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char i[10] = \"123456789\";\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char *i = \"123456789\";\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); } void localvar2() { functionVariableUsage("int foo()\n" "{\n" " int i;\n" " return i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n", errout.str()); functionVariableUsage("bool foo()\n" "{\n" " bool i;\n" " return i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n", errout.str()); // undefined variables are not reported because they may be classes with constructors functionVariableUsage("undefined foo()\n" "{\n" " undefined i;\n" " return i;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("undefined *foo()\n" "{\n" " undefined * i;\n" " return i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n", errout.str()); functionVariableUsage("int *foo()\n" "{\n" " int * i;\n" " return i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n", errout.str()); functionVariableUsage("const int *foo()\n" "{\n" " const int * i;\n" " return i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n", errout.str()); functionVariableUsage("struct S *foo()\n" "{\n" " struct S * i;\n" " return i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n", errout.str()); functionVariableUsage("const struct S *foo()\n" "{\n" " const struct S * i;\n" " return i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n", errout.str()); // assume f() can write a functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " f(a[0]);\n" "}\n"); ASSERT_EQUALS("", errout.str()); // assume f() can write a functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " f(a[0], 0);\n" "}\n"); ASSERT_EQUALS("", errout.str()); // assume f() can write a functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " f(0, a[0]);\n" "}\n"); ASSERT_EQUALS("", errout.str()); // assume f() can write a functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " f(0, a[0], 0);\n" "}\n"); ASSERT_EQUALS("", errout.str()); // f() can not write a (not supported yet) functionVariableUsage("void f(int i) { }\n" "void foo()\n" "{\n" " int a[10];\n" " f(a[0]);\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'a' is not assigned a value\n", errout.str()); // f() can not write a (not supported yet) functionVariableUsage("void f(const int & i) { }\n" "void foo()\n" "{\n" " int a[10];\n" " f(a[0]);\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'a' is not assigned a value\n", errout.str()); // f() writes a functionVariableUsage("void f(int & i) { }\n" "void foo()\n" "{\n" " int a[10];\n" " f(a[0]);\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar3() { functionVariableUsage("void foo()\n" "{\n" " int i;\n" " if ( abc )\n" " ;\n" " else i = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) 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("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i = 0;\n" " f(&i);\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar5() { functionVariableUsage("void foo()\n" "{\n" " int a = 0;\n" " b = (char)a;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar6() { functionVariableUsage("void foo()\n" "{\n" " int b[10];\n" " for (int i=0;i<10;++i)\n" " b[i] = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a = 0;\n" " int b[10];\n" " for (int i=0;i<10;++i)\n" " b[i] = ++a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); } void localvar7()// ticket 1253 { functionVariableUsage("void foo()\n" "{\n" " int i;\n" " i--;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i;\n" " int &ii(i);\n" " ii--;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i;\n" " int &ii=i;\n" " ii--;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n", errout.str()); } void localvar8() { functionVariableUsage("void foo()\n" "{\n" " int i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i[2];\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " void * i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " const void * i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " A * i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " struct A * i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " const struct A * i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int * i[2];\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " const int * i[2];\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " void * i[2];\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " const void * i[2];\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " struct A * i[2];\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " const struct A * i[2];\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo(int n)\n" "{\n" " int i[n];\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i = 0;\n" " int &j = i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n" "[test.cpp:4]: (style) Variable 'j' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i;\n" " int &j = i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n" "[test.cpp:4]: (style) Variable 'j' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i;\n" " int &j = i;\n" " j = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " A * i;\n" " i->f();\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char * i;\n" " if (i);\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char * i = 0;\n" " if (i);\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char * i = new char[10];\n" " if (i);\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char *i;\n" " f(i);\n" "}\n"); functionVariableUsage("int a;\n" "void foo()\n" "{\n" " return &a;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int a[10];\n" "void foo()\n" "{\n" " int *p = a;\n" " for (int i = 0; i < 10; i++)\n" " p[i] = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int a[10];\n" "void foo()\n" "{\n" " int *p = &a[0];\n" " for (int i = 0; i < 10; i++)\n" " p[i] = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int x;\n" " a[0] = 0;\n" " x = a[0];\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'x' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a, b, c;\n" " a = b = c = f();\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("int * foo()\n" "{\n" " return &undefined[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar9() { // ticket #1605 functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " for (int i = 0; i < 10; )\n" " a[i++] = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); } void localvar10() { functionVariableUsage("void foo(int x)\n" "{\n" " int i;\n" " if (x) {\n" " int i;\n" " } else {\n" " int i;\n" " }\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n" "[test.cpp:5]: (style) Unused variable: i\n" "[test.cpp:7]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo(int x)\n" "{\n" " int i;\n" " if (x)\n" " int i;\n" " else\n" " int i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n" "[test.cpp:5]: (style) Unused variable: i\n" "[test.cpp:7]: (style) Unused variable: i\n", errout.str()); functionVariableUsage("void foo(int x)\n" "{\n" " int i;\n" " if (x) {\n" " int i;\n" " } else {\n" " int i = 0;\n" " }\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n" "[test.cpp:5]: (style) Unused variable: i\n" "[test.cpp:7]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo(int x)\n" "{\n" " int i;\n" " if (x) {\n" " int i;\n" " } else {\n" " int i;\n" " }\n" " i = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n" "[test.cpp:5]: (style) Unused variable: i\n" "[test.cpp:7]: (style) Unused variable: i\n", errout.str()); } void localvar11() { functionVariableUsage("void foo(int x)\n" "{\n" " int a = 0;\n" " if (x == 1)\n" " {\n" " a = 123;\n" // redundant assignment " return;\n" " }\n" " x = a;\n" "}\n"); ASSERT_EQUALS("", errout.str()); // The variable 'a' is initialized. But the initialized value is // never used. It is only initialized for security reasons. functionVariableUsage("void foo(int x)\n" "{\n" " int a = 0;\n" " if (x == 1)\n" " a = 123;\n" " else if (x == 2)\n" " a = 456;\n" " else\n" " return;\n" " x = a;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar12() { // ticket #1574 functionVariableUsage("void foo()\n" "{\n" " int a, b, c, d, e, f;\n" " a = b = c = d = e = f = 0;\n" "\n" "}\n"); ASSERT_EQUALS( "[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n" "[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n" "[test.cpp:3]: (style) Variable 'c' is assigned a value that is never used\n" "[test.cpp:3]: (style) Variable 'd' is assigned a value that is never used\n" "[test.cpp:3]: (style) Variable 'e' is assigned a value that is never used\n" "[test.cpp:3]: (style) Variable 'f' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a, b, c = 0;\n" " a = b = c;\n" "\n" "}\n"); ASSERT_EQUALS( "[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n" "[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); TODO_ASSERT_EQUALS( "[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n" "[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n" "[test.cpp:3]: (style) Variable 'c' is assigned a value that is never used\n", errout.str()); } void localvar13() // ticket #1640 { functionVariableUsage("void foo( OBJECT *obj )\n" "{\n" " int x;\n" " x = obj->ySize / 8;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'x' is assigned a value that is never used\n", errout.str()); } void localvar14() { // ticket #5 functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: a\n", errout.str()); } void localvar15() { functionVariableUsage("int foo()\n" "{\n" " int a = 5;\n" " int b[a];\n" " b[0] = 0;\n" " return b[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo()\n" "{\n" " int a = 5;\n" " int * b[a];\n" " b[0] = &c;\n" " return *b[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int * foo()\n" "{\n" " int a = 5;\n" " const int * b[a];\n" " b[0] = &c;\n" " return b[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct B * foo()\n" "{\n" " int a = 5;\n" " struct B * b[a];\n" " b[0] = &c;\n" " return b[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("const struct B * foo()\n" "{\n" " int a = 5;\n" " const struct B * b[a];\n" " b[0] = &c;\n" " return b[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar16() // ticket #1709 { functionVariableUsage("int foo()\n" "{\n" " char buf[5];\n" " char *ptr = buf;\n" " *(ptr++) = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo()\n" "{\n" " char buf[5];\n" " char *ptr = buf - 1;\n" " *(++ptr) = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar17() // ticket #1720 { // Don't crash when checking the code below! functionVariableUsage("void foo()\n" "{\n" " struct DATA *data;\n" " char *k = data->req;\n" " char *ptr;\n" " char *line_start;\n" " ptr = data->buffer;\n" " line_start = ptr;\n" " data->info = k;\n" " line_start = ptr;\n" "}\n"); ASSERT_EQUALS("[test.cpp:6]: (style) Variable 'line_start' is assigned a value that is never used\n", errout.str()); } void localvar18() // ticket #1723 { functionVariableUsage("A::A(int iValue) {\n" " UserDefinedException* pe = new UserDefinedException();\n" " throw pe;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar19() // ticket #1776 { functionVariableUsage("void foo() {\n" " int a[10];\n" " int c;\n" " c = *(a);\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'a' is not assigned a value\n" "[test.cpp:3]: (style) Variable 'c' is assigned a value that is never used\n", errout.str()); } void localvar20() // ticket #1799 { functionVariableUsage("void foo()\n" "{\n" " char c1 = 'c';\n" " char c2[] = { c1 };\n" " a(c2);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar21() // ticket #1807 { functionVariableUsage("void foo()\n" "{\n" " char buffer[1024];\n" " bar((void *)buffer);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar22() // ticket #1811 { functionVariableUsage("int foo(int u, int v)\n" "{\n" " int h, i;\n" " h = 0 ? u : v;\n" " i = 1 ? u : v;\n" " return h + i;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar23() // ticket #1808 { functionVariableUsage("int foo(int c)\n" "{\n" " int a;\n" " int b[10];\n" " a = b[c] = 0;\n" " return a;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar24() // ticket #1803 { functionVariableUsage("class MyException\n" "{\n" " virtual void raise() const\n" " {\n" " throw *this;\n" " }\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar25() // ticket #1729 { functionVariableUsage("int main() {\n" " int ppos = 1;\n" " int pneg = 0;\n" " const char*edge = ppos? \" +\" : pneg ? \" -\" : \"\";\n" " printf(\"This should be a '+' -> %s\n\", edge);\n" " return 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar26() // ticket #1894 { functionVariableUsage("int main() {\n" " const Fred &fred = getfred();\n" " int *p = fred.x();\n" " *p = 0;" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar27() // ticket #2160 { functionVariableUsage("void f(struct s *ptr) {\n" " int param = 1;\n" " ptr->param = param++;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar28() // ticket #2205 { functionVariableUsage("void f(char* buffer, int value) {\n" " char* pos = buffer;\n" " int size = value;\n" " *(int*)pos = size;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar29() // ticket #2206 { functionVariableUsage("void f() {\n" " float s_ranges[] = { 0, 256 };\n" " float* ranges[] = { s_ranges };\n" " cout << ranges[0][0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar30() // ticket #2264 { functionVariableUsage("void f() {\n" " Engine *engine = e;\n" " x->engine = engine->clone();\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar31() // ticket #2286 { functionVariableUsage("void f() {\n" " int x = 0;\n" " a.x = x - b;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar32() // ticket #2330 { functionVariableUsage("void f() {\n" " int x;\n" " fstream &f = getfile();\n" " f >> x;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvaralias1() { functionVariableUsage("void foo()\n" "{\n" " int a;\n" " int *b = &a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: a\n" "[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int *b = a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: a\n" "[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a;\n" " int *b = &a;\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a;\n" " char *b = (char *)&a;\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a;\n" " char *b = (char *)(&a);\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a;\n" " const char *b = (const char *)&a;\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a;\n" " const char *b = (const char *)(&a);\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a;\n" " char *b = static_cast(&a);\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a;\n" " const char *b = static_cast(&a);\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); // a is not a local variable and b is aliased to it functionVariableUsage("int a;\n" "void foo()\n" "{\n" " int *b = &a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); // a is not a local variable and b is aliased to it functionVariableUsage("void foo(int a)\n" "{\n" " int *b = &a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); // a is not a local variable and b is aliased to it functionVariableUsage("class A\n" "{\n" " int a;\n" " void foo()\n" " {\n" " int *b = &a;\n" " }\n" "}\n"); ASSERT_EQUALS("[test.cpp:6]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); functionVariableUsage("int a;\n" "void foo()\n" "{\n" " int *b = &a;\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo(int a)\n" "{\n" " int *b = &a;\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class A\n" "{\n" " int a;\n" " void foo()\n" " {\n" " int *b = &a;\n" " *b = 0;\n" " }\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int *b = a;\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " char *b = (char *)a;\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " char *b = (char *)(a);\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " const char *b = (const char *)a;\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " const char *b = (const char *)(a);\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " char *b = static_cast(a);\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " const char *b = static_cast(a);\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("int a[10];\n" "void foo()\n" "{\n" " int *b = a;\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int a[10];\n" "void foo()\n" "{\n" " int *b = a;\n" " int *c = b;\n" " *c = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = a;\n" " int *c = b;\n" " *c = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = a;\n" " int *c = b;\n" " *c = b[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = a;\n" " int *c;\n" " *c = b[0];\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'c' is not assigned a value\n", errout.str()); functionVariableUsage("int a[10];\n" "void foo()\n" "{\n" " int *b = a;\n" " int c = b[0];\n" " c = c;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = a;\n" " int c = b[0];\n" " c = c;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int a[10];\n" "void foo()\n" "{\n" " int *b = &a[0];\n" " a[0] = b[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = &a[0];\n" " a[0] = b[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = a;\n" " a[0] = b[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo(int a[10])\n" "{\n" " int *b = a;\n" " *b = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class A\n" "{\n" " int a[10];\n" " void foo()\n" " {\n" " int *b = a;\n" " *b = 0;\n" " }\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int *b = a;\n" " int *c = b;\n" " *c = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int b[10];\n" " int *c = a;\n" " int *d = b;\n" " *d = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: a\n" "[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n" "[test.cpp:5]: (style) Variable 'c' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int b[10];\n" " int *c = a;\n" " c = b;\n" " *c = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: a\n" "[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int b[10];\n" " int *c = a;\n" " c = b;\n" " *c = 0;\n" " c = a;\n" " *c = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n" "[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10], * b = a + 10;\n" " b[-10] = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10], * b = a + 10;\n" " b[-10] = 0;\n" " int * c = b - 10;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n" "[test.cpp:5]: (style) Variable 'c' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10], * b = a + 10;\n" " int * c = b - 10;\n" " x = c[0];\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is not assigned a value\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10], * b = a + 10;\n" " int * c = b - 10;\n" " c[1] = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10], * b = a + 10;\n" " int * c = b - 10;\n" " c[1] = c[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10], * b = a + 10;\n" " int * c = b - 10;\n" " int d = c[0];\n" " f(d);\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is not assigned a value\n", errout.str()); functionVariableUsage("struct S { char c[100]; };\n" "void foo()\n" "{\n" " char a[100];\n" " struct S * s = (struct S *)a;\n" " s->c[0] = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct S { char c[100]; };\n" "void foo()\n" "{\n" " char a[100];\n" " struct S * s = (struct S *)a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: a\n" "[test.cpp:5]: (style) Variable 's' is assigned a value that is never used\n", errout.str()); functionVariableUsage("struct S { char c[100]; };\n" "void foo()\n" "{\n" " char a[100];\n" " const struct S * s = (const struct S *)a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: a\n" "[test.cpp:5]: (style) Variable 's' is assigned a value that is never used\n", errout.str()); functionVariableUsage("struct S { char c[100]; };\n" "void foo()\n" "{\n" " char a[100];\n" " struct S * s = static_cast(a);\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: a\n" "[test.cpp:5]: (style) Variable 's' is assigned a value that is never used\n", errout.str()); functionVariableUsage("struct S { char c[100]; };\n" "void foo()\n" "{\n" " char a[100];\n" " const struct S * s = static_cast(a);\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: a\n" "[test.cpp:5]: (style) Variable 's' is assigned a value that is never used\n", errout.str()); functionVariableUsage("int a[10];\n" "void foo()\n" "{\n" " int b[10];\n" " int c[10];\n" " int *d;\n" " d = b;\n" " d = a;\n" " d = c;\n" " *d = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: b\n" "[test.cpp:5]: (style) Variable 'c' is assigned a value that is never used\n", errout.str()); functionVariableUsage("int a[10];\n" "void foo()\n" "{\n" " int b[10];\n" " int c[10];\n" " int *d;\n" " d = b; *d = 0;\n" " d = a; *d = 0;\n" " d = c; *d = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n" "[test.cpp:5]: (style) Variable 'c' is assigned a value that is never used\n", errout.str()); } void localvaralias2() // ticket 1637 { functionVariableUsage("void foo()\n" "{\n" " int * a;\n" " a = a;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvaralias3() // ticket 1639 { functionVariableUsage("void foo()\n" "{\n" " BROWSEINFO info;\n" " char szDisplayName[MAX_PATH];\n" " info.pszDisplayName = szDisplayName;\n" " SHBrowseForFolder(&info);\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvaralias4() // ticket 1643 { functionVariableUsage("struct AB { int a; int b; } ab;\n" "void foo()\n" "{\n" " int * a = &ab.a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("struct AB { int a; int b; } ab;\n" "void foo()\n" "{\n" " int * a = &ab.a;\n" " *a = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct AB { int a; int b; };\n" "void foo()\n" "{\n" " struct AB ab;\n" " int * a = &ab.a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'a' is assigned a value that is never used\n", errout.str()); functionVariableUsage("struct AB { int a; int b; };\n" "void foo()\n" "{\n" " struct AB ab;\n" " int * a = &ab.a;\n" " *a = 0;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvaralias5() // ticket 1647 { functionVariableUsage("char foo()\n" "{\n" " char buf[8];\n" " char *p = &buf[0];\n" " *p++ = 0;\n" " return buf[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("char foo()\n" "{\n" " char buf[8];\n" " char *p = &buf[1];\n" " *p-- = 0;\n" " return buf[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("char foo()\n" "{\n" " char buf[8];\n" " char *p = &buf[0];\n" " *++p = 0;\n" " return buf[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("char foo()\n" "{\n" " char buf[8];\n" " char *p = &buf[1];\n" " *--p = 0;\n" " return buf[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvaralias6() // ticket 1729 { functionVariableUsage("void foo()\n" "{\n" " char buf[8];\n" " char *srcdata;\n" " if (a()) {\n" " buf[0] = 1;\n" " srcdata = buf;\n" " } else {\n" " srcdata = vdata;\n" " }\n" " b(srcdata);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char buf[8];\n" " char *srcdata;\n" " if (a()) {\n" " buf[0] = 1;\n" " srcdata = buf;\n" " srcdata = vdata;\n" " }\n" " b(srcdata);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'buf' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char buf[8];\n" " char *srcdata;\n" " if (a()) {\n" " buf[0] = 1;\n" " srcdata = buf;\n" " }\n" " srcdata = vdata;\n" " b(srcdata);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'buf' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char buf[8];\n" " char *srcdata;\n" " if (a()) {\n" " srcdata = buf;\n" " }\n" " srcdata = vdata;\n" " b(srcdata);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: buf\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char buf[8];\n" " char *srcdata;\n" " if (a()) {\n" " srcdata = vdata;\n" " }\n" " srcdata = buf;\n" " b(srcdata);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char buf[8];\n" " char *srcdata;\n" " char vdata[8];\n" " if (a()) {\n" " buf[0] = 1;\n" " srcdata = buf;\n" " } else {\n" " srcdata = vdata;\n" " }\n" " b(srcdata);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char buf[8];\n" " char *srcdata;\n" " char vdata[8];\n" " if (a()) {\n" " buf[0] = 1;\n" " srcdata = buf;\n" " srcdata = vdata;\n" " }\n" " b(srcdata);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'buf' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char buf[8];\n" " char *srcdata;\n" " char vdata[8];\n" " if (a()) {\n" " buf[0] = 1;\n" " srcdata = buf;\n" " }\n" " srcdata = vdata;\n" " b(srcdata);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'buf' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char buf[8];\n" " char *srcdata;\n" " char vdata[8];\n" " if (a()) {\n" " srcdata = buf;\n" " }\n" " srcdata = vdata;\n" " b(srcdata);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: buf\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char buf[8];\n" " char *srcdata;\n" " char vdata[8];\n" " if (a()) {\n" " srcdata = vdata;\n" " }\n" " srcdata = buf;\n" " b(srcdata);\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (style) Unused variable: vdata\n", errout.str()); } void localvaralias7() // ticket 1732 { functionVariableUsage("void foo()\n" "{\n" " char *c[10];\n" " char **cp;\n" " cp = c;\n" " *cp = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvaralias8() { functionVariableUsage("void foo()\n" "{\n" " char b1[8];\n" " char b2[8];\n" " char b3[8];\n" " char b4[8];\n" " char *pb;\n" " if (a == 1)\n" " pb = b1;\n" " else if (a == 2)\n" " pb = b2;\n" " else if (a == 3)\n" " pb = b3;\n" " else\n" " pb = b4;\n" " b(pb);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char b1[8];\n" " char b2[8];\n" " char b3[8];\n" " char b4[8];\n" " char *pb;\n" " if (a == 1)\n" " pb = b1;\n" " else if (a == 2)\n" " pb = b2;\n" " else if (a == 3)\n" " pb = b3;\n" " else {\n" " pb = b1;\n" " pb = b4;\n" " }\n" " b(pb);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char b1[8];\n" " char b2[8];\n" " char b3[8];\n" " char b4[8];\n" " char *pb;\n" " if (a == 1)\n" " pb = b1;\n" " else if (a == 2)\n" " pb = b2;\n" " else if (a == 3)\n" " pb = b3;\n" " else {\n" " pb = b1;\n" " pb = b2;\n" " pb = b3;\n" " pb = b4;\n" " }\n" " b(pb);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char b1[8];\n" " char b2[8];\n" " char b3[8];\n" " char b4[8];\n" " char *pb;\n" " if (a == 1)\n" " pb = b1;\n" " else if (a == 2)\n" " pb = b2;\n" " else if (a == 3)\n" " pb = b3;\n" " pb = b4;\n" " b(pb);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: b1\n" "[test.cpp:4]: (style) Unused variable: b2\n" "[test.cpp:5]: (style) Unused variable: b3\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char b1[8];\n" " char b2[8];\n" " char b3[8];\n" " char b4[8];\n" " char *pb;\n" " if (a == 1)\n" " pb = b1;\n" " else {\n" " if (a == 2)\n" " pb = b2;\n" " else {\n" " if (a == 3)\n" " pb = b3;\n" " else\n" " pb = b4;\n" " }\n" " }\n" " b(pb);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char b1[8];\n" " char b2[8];\n" " char b3[8];\n" " char b4[8];\n" " char *pb;\n" " if (a == 1)\n" " pb = b1;\n" " else {\n" " if (a == 2)\n" " pb = b2;\n" " else {\n" " if (a == 3)\n" " pb = b3;\n" " else {\n" " pb = b1;\n" " pb = b4;\n" " }\n" " }\n" " }\n" " b(pb);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char b1[8];\n" " char b2[8];\n" " char b3[8];\n" " char b4[8];\n" " char *pb;\n" " if (a == 1)\n" " pb = b1;\n" " else {\n" " if (a == 2)\n" " pb = b2;\n" " else {\n" " if (a == 3)\n" " pb = b3;\n" " else {\n" " pb = b1;\n" " pb = b2;\n" " pb = b3;\n" " pb = b4;\n" " }\n" " }\n" " }\n" " b(pb);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char b1[8];\n" " char b2[8];\n" " char b3[8];\n" " char b4[8];\n" " char *pb;\n" " if (a == 1)\n" " pb = b1;\n" " else {\n" " if (a == 2)\n" " pb = b2;\n" " else {\n" " if (a == 3)\n" " pb = b3;\n" " }\n" " }\n" " pb = b4;\n" " b(pb);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: b1\n" "[test.cpp:4]: (style) Unused variable: b2\n" "[test.cpp:5]: (style) Unused variable: b3\n", errout.str()); } void localvaralias9() // ticket 1996 { functionVariableUsage("void foo()\n" "{\n" " Foo foo;\n" " Foo &ref = foo;\n" " ref[0] = 123;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvaralias10() // ticket 2004 { functionVariableUsage("void foo(Foo &foo)\n" "{\n" " Foo &ref = foo;\n" " int *x = &ref.x();\n" " *x = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarasm() { functionVariableUsage("void foo(int &b)\n" "{\n" " int a;\n" " asm();\n" " b = a;\n" "}\n"); ASSERT_EQUALS("", 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("", 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("", 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("", errout.str()); TODO_ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: x\n" "[test.cpp:4]: (style) Unused variable: z\n", errout.str()); } void localvarStruct4() { /* This must not SIGSEGV: */ functionVariableUsage("void foo()\n" "{\n" " struct { \n"); } 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("", errout.str()); } } void localvarInvert() { functionVariableUsage("int main()\n" "{\n" " int tmp = 10;\n" " return ~tmp;\n" "}\n"); ASSERT_EQUALS("", 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("", 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("", errout.str()); } void localvarOpAssign() { functionVariableUsage("void foo()\n" "{\n" " int a = 1;\n" " int b = 2;\n" " a |= b;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) 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("", errout.str()); } void localvarShift1() { functionVariableUsage("int foo()\n" "{\n" " int var = 1;\n" " return 1 >> var;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvarShift2() { functionVariableUsage("int foo()\n" "{\n" " int var = 1;\n" " while (var = var >> 1) { }\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvarCast() { functionVariableUsage("int foo()\n" "{\n" " int a = 1;\n" " int b = static_cast(a);\n" " return b;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvarClass() { functionVariableUsage("int foo()\n" "{\n" " class B : public A {\n" " int a;\n" " int f() { return a; }\n" " } b;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvarUnused() { functionVariableUsage("int foo()\n" "{\n" " bool test __attribute__((unused));\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo()\n" "{\n" " bool test __attribute__((unused)) = true;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo()\n" "{\n" " bool __attribute__((unused)) test;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo()\n" "{\n" " bool __attribute__((unused)) test = true;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvarFunction() { functionVariableUsage("void check_dlsym(void*& h)\n" "{\n" " typedef void (*function_type) (void);\n" " function_type fn;\n" " fn = reinterpret_cast(dlsym(h, \"try_allocation\"));\n" " fn();\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarstatic() { functionVariableUsage("void foo()\n" "{\n" " static int i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " static int i = 0;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " static int i(0);\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); // If "a" is undefined then Cppcheck can't determine whether // "static int i(a);" is a variable declaration or a function // declaration. functionVariableUsage("void foo()\n" "{\n" " static int i(a);\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " static int j = 0;\n" " static int i(j);\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str()); functionVariableUsage("int * foo(int x)\n" "{\n" " static int a[] = { 3, 4, 5, 6 };\n" " static int b[] = { 4, 5, 6, 7 };\n" " static int c[] = { 5, 6, 7, 8 };\n" " b[1] = 1;\n" " return x ? a : c;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n", errout.str()); } void localvardynamic() { functionVariableUsage("void foo()\n" "{\n" " void* ptr = malloc(16);\n" " free(ptr);\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'ptr' is allocated memory that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " void* ptr = g_malloc(16);\n" " g_free(ptr);\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'ptr' is allocated memory that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " void* ptr = kmalloc(16, GFP_KERNEL);\n" " kfree(ptr);\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'ptr' is allocated memory that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " void* ptr = vmalloc(16, GFP_KERNEL);\n" " vfree(ptr);\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'ptr' is allocated memory that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char* ptr = new char[16];\n" " delete[] ptr;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'ptr' is allocated memory that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char* ptr = new char;\n" " delete ptr;\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'ptr' is allocated memory that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " void* ptr = malloc(16);\n" " ptr[0] = 123;\n" " free(ptr);\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char* ptr = new char[16];\n" " ptr[0] = 123;\n" " delete[] ptr;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " Fred* fred = new Fred;\n" " std::cout << \"test\" << std::endl;\n" " delete fred;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct Fred { int a; };\n" "void foo()\n" "{\n" " Fred* fred = new Fred;\n" " std::cout << \"test\" << std::endl;\n" " delete fred;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'fred' is allocated memory that is never used\n", errout.str()); functionVariableUsage("struct Fred { int a; Fred() : a(0) {} };\n" "void foo()\n" "{\n" " Fred* fred = new Fred;\n" " std::cout << \"test\" << std::endl;\n" " delete fred;\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " Fred* fred = malloc(sizeof(Fred));\n" " std::cout << \"test\" << std::endl;\n" " free(fred);\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'fred' is allocated memory that is never used\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char* ptr = names[i];\n" " delete[] ptr;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } }; REGISTER_TEST(TestUnusedVar)