/* * Cppcheck - A tool for static C/C++ code analysis * Copyright (C) 2007-2014 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 "checkunusedvar.h" #include extern std::ostringstream errout; class TestUnusedVar : public TestFixture { public: TestUnusedVar() : TestFixture("TestUnusedVar") { } private: void run() { TEST_CASE(emptyclass); // #5355 - False positive: Variable is not assigned a value. TEST_CASE(emptystruct); // #5355 - False positive: Variable is not assigned a value. 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(structmember11); // #4168 - initialization with {} / passed by address to unknown function 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(localvar33); // ticket #2346 TEST_CASE(localvar34); // ticket #2368 TEST_CASE(localvar35); // ticket #2535 TEST_CASE(localvar36); // ticket #2805 TEST_CASE(localvar37); // ticket #3078 TEST_CASE(localvar38); TEST_CASE(localvar39); // ticket #3454 TEST_CASE(localvar40); // ticket #3473 TEST_CASE(localvar41); // ticket #3481 TEST_CASE(localvar42); // ticket #3603 TEST_CASE(localvar43); // ticket #3742 TEST_CASE(localvar44); // ticket #3602 TEST_CASE(localvar45); // ticket #4020 TEST_CASE(localvar46); // ticket #4899 TEST_CASE(localvar47); // ticket #5491 (C++11 style initialization) 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(localvaralias11); // ticket #4423 - iterator TEST_CASE(localvaralias12); // ticket #4394 TEST_CASE(localvaralias13); // ticket #4487 TEST_CASE(localvarasm); TEST_CASE(localvarstatic); TEST_CASE(localvarextern); TEST_CASE(localvardynamic1); TEST_CASE(localvardynamic2); // ticket #2904 TEST_CASE(localvardynamic3); // ticket #3467 TEST_CASE(localvararray1); // ticket #2780 TEST_CASE(localvararray2); // ticket #3438 TEST_CASE(localvararray3); // ticket #3980 TEST_CASE(localvarstring1); TEST_CASE(localvarstring2); // ticket #2929 TEST_CASE(localvarconst1); TEST_CASE(localvarconst2); TEST_CASE(localvarthrow); // ticket #3687 TEST_CASE(localVarStd); // Don't give false positives for variables in structs/unions TEST_CASE(localvarStruct1); TEST_CASE(localvarStruct2); TEST_CASE(localvarStruct3); TEST_CASE(localvarStruct5); TEST_CASE(localvarStruct6); TEST_CASE(localvarStructArray); 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(localvarForEach); // #4155 - BOOST_FOREACH, hlist_for_each, etc TEST_CASE(localvarShift1); // 1 >> var TEST_CASE(localvarShift2); // x = x >> 1 TEST_CASE(localvarShift3); // x << y TEST_CASE(localvarCast); TEST_CASE(localvarClass); TEST_CASE(localvarUnused); TEST_CASE(localvarFunction); // ticket #1799 TEST_CASE(localvarIfNOT); // #3104 - if ( NOT var ) TEST_CASE(localvarAnd); // #3672 TEST_CASE(localvarSwitch); // #3744 - false positive when localvar is used in switch TEST_CASE(localvarNULL); // #4203 - Setting NULL value is not redundant - it is safe TEST_CASE(localvarUnusedGoto); // #4447, #4558 goto TEST_CASE(localvarCpp11Initialization); TEST_CASE(chainedAssignment); // #5466 TEST_CASE(crash1); TEST_CASE(crash2); TEST_CASE(usingNamespace); // #4585 } void checkStructMemberUsage(const char code[]) { // Clear the error buffer.. errout.str(""); Settings settings; settings.addEnabled("style"); // Tokenize.. Tokenizer tokenizer(&settings, this); std::istringstream istr(code); tokenizer.tokenize(istr, "test.cpp"); // Check for unused variables.. CheckUnusedVar checkUnusedVar(&tokenizer, &settings, this); checkUnusedVar.checkStructMemberUsage(); } // #5355 - False positive: Variable is not assigned a value. void emptyclass() { functionVariableUsage("class Carla {\n" "};\n" "class Fred : Carla {\n" "};\n" "void foo() {\n" " Fred fred;\n" " throw fred;\n" "}"); ASSERT_EQUALS("", errout.str()); } // #5355 - False positive: Variable is not assigned a value. void emptystruct() { functionVariableUsage("struct Fred {\n" "};\n" "void foo() {\n" " Fred fred;\n" " throw fred;\n" "}"); ASSERT_EQUALS("", errout.str()); } void structmember1() { checkStructMemberUsage("struct abc\n" "{\n" " int a;\n" " int b;\n" " int c;\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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS("", errout.str()); } void structmember9() { checkStructMemberUsage("struct base {\n" " int a;\n" "};\n" "\n" "struct derived : public base {" "}"); ASSERT_EQUALS("", errout.str()); } void structmember10() { // Fred may have some useful side-effects checkStructMemberUsage("struct abc {\n" " Fred fred;\n" "};"); ASSERT_EQUALS("", errout.str()); } void structmember11() { // #4168 checkStructMemberUsage("struct abc { int x; };\n" "struct abc s = {0};\n" "void f() { do_something(&s); }"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct abc { int x; };\n" "struct abc s = {0};\n" "void f() { }"); TODO_ASSERT_EQUALS("abc::x is not used", "", 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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) struct or union member 'AB::a' is never used.\n", errout.str()); } void functionVariableUsage(const char code[], const char filename[]="test.cpp") { // Clear the error buffer.. errout.str(""); Settings settings; settings.addEnabled("style"); // Tokenize.. Tokenizer tokenizer(&settings, this); std::istringstream istr(code); if (!tokenizer.tokenize(istr, filename)) return; // Check for unused variables.. CheckUnusedVar checkUnusedVar(&tokenizer, &settings, this); checkUnusedVar.checkFunctionVariableUsage(); } void localvar1() { functionVariableUsage("void foo()\n" "{\n" " int i = 0;\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" "}"); 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" "}"); 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 j = 0;\n" " int i(j);\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" " x(j);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int j = 0;\n" " const int & i = j;\n" " x(j);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int j = 0;\n" " int & i(j);\n" " x(j);\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" " x(j);\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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS("[test.cpp:4]: (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" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("undefined foo()\n" "{\n" " undefined i = 0;\n" "}\n", "test.c"); ASSERT_EQUALS("[test.c:3]: (style) Variable 'i' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int i = undefined;\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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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,code=10;\n" " for(i = 0; i < 10; i++) {\n" " std::cout<f();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char * i;\n" " if (i);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char * i = 0;\n" " if (i);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char * i = new char[10];\n" " if (i);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char *i;\n" " f(i);\n" "}"); functionVariableUsage("int a;\n" "void foo()\n" "{\n" " return &a;\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" "}"); 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" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int x;\n" " a[0] = 0;\n" " x = a[0];\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (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" "}"); ASSERT_EQUALS("[test.cpp:4]: (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" "[test.cpp:4]: (style) Variable 'c' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("int * foo()\n" "{\n" " return &undefined[0];\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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); 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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS("[test.cpp:9]: (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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS( "[test.cpp:4]: (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" "[test.cpp:4]: (style) Variable 'c' is assigned a value that is never used.\n" "[test.cpp:4]: (style) Variable 'd' is assigned a value that is never used.\n" "[test.cpp:4]: (style) Variable 'e' is assigned a value that is never used.\n" "[test.cpp:4]: (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" "}"); TODO_ASSERT_EQUALS( "[test.cpp:4]: (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" "[test.cpp:3]: (style) Variable 'c' is assigned a value that is never used.\n", "[test.cpp:4]: (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()); } void localvar13() { // ticket #1640 functionVariableUsage("void foo( OBJECT *obj )\n" "{\n" " int x;\n" " x = obj->ySize / 8;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS("", errout.str()); } void localvar16() { // ticket #1709 functionVariableUsage("int foo()\n" "{\n" " char buf[5];\n" " char *ptr = buf;\n" " *(ptr++) = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'buf' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("int foo()\n" "{\n" " char buf[5];\n" " char *ptr = buf - 1;\n" " *(++ptr) = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'buf' is not assigned a value.\n", errout.str()); // #3910 functionVariableUsage("int foo() {\n" " char buf[5];\n" " char *data[2];\n" " data[0] = buf;\n" " do_something(data);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo() {\n" " char buf1[5];\n" " char buf2[5];\n" " char *data[2];\n" " data[0] = buf1;\n" " data[1] = buf2;\n" " do_something(data);\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" "}"); ASSERT_EQUALS("[test.cpp:10]: (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" "}"); 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:4]: (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" "}"); 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("[test.cpp:5]: (style) Variable 'b' is assigned a value that is never used.\n", errout.str()); } void localvar24() { // ticket #1803 functionVariableUsage("class MyException\n" "{\n" " virtual void raise() const\n" " {\n" " throw *this;\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" "}"); ASSERT_EQUALS("", errout.str()); } void localvar26() { // ticket #1894 functionVariableUsage("int main() {\n" " const Fred &fred = getfred();\n" " int *p = fred.x();\n" " *p = 0;" "}"); ASSERT_EQUALS("", errout.str()); } void localvar27() { // ticket #2160 functionVariableUsage("void f(struct s *ptr) {\n" " int param = 1;\n" " ptr->param = param++;\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" "}"); 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" "}"); ASSERT_EQUALS("", errout.str()); } void localvar30() { // ticket #2264 functionVariableUsage("void f() {\n" " Engine *engine = e;\n" " x->engine = engine->clone();\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar31() { // ticket #2286 functionVariableUsage("void f() {\n" " int x = 0;\n" " a.x = x - b;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar32() { // ticket #2330 - fstream >> x functionVariableUsage("void f() {\n" " int x;\n" " fstream &f = getfile();\n" " f >> x;\n" "}"); ASSERT_EQUALS("", errout.str()); // ticket #4596 - if (c >>= x) {} functionVariableUsage("void f() {\n" " int x;\n" " C c;\n" // possibly some stream class " if (c >>= x) {}\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" " int x;\n" " C c;\n" " if (c >>= x) {}\n" "}", "test.c"); TODO_ASSERT_EQUALS("[test.c:2]: (style) Variable 'x' is not assigned a value.\n", "[test.c:2]: (style) Variable 'x' is not assigned a value.\n" "[test.c:3]: (style) Variable 'c' is not assigned a value.\n", errout.str()); functionVariableUsage("void f(int c) {\n" " int x;\n" " if (c >> x) {}\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'x' is not assigned a value.\n", errout.str()); functionVariableUsage("void f() {\n" " int x, y;\n" " std::cin >> x >> y;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" " int x, y;\n" " std::cin >> (x >> y);\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'x' is not assigned a value.\n" "[test.cpp:2]: (style) Variable 'y' is not assigned a value.\n", errout.str()); } void localvar33() { // ticket #2345 functionVariableUsage("void f() {\n" " Abc* abc = getabc();\n" " while (0 != (abc = abc->next())) {\n" " ++nOldNum;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar34() { // ticket #2368 functionVariableUsage("void f() {\n" " int i = 0;\n" " if (false) {\n" " } else {\n" " j -= i;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar35() { // ticket #2535 functionVariableUsage("void f() {\n" " int a, b;\n" " x(1,a,b);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar36() { // ticket #2805 functionVariableUsage("int f() {\n" " int a, b;\n" " a = 2 * (b = 3);\n" " return a + b;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int f() {\n" // ticket #4318 " int a,b;\n" " x(a, b=2);\n" // <- if param2 is passed-by-reference then b might be used in x "}"); ASSERT_EQUALS("", errout.str()); } void localvar37() { // ticket #3078 functionVariableUsage("void f() {\n" " int a = 2;\n" " ints.at(a) = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar38() { functionVariableUsage("std::string f() {\n" " const char code[] = \"foo\";\n" " const std::string s1(sizeof_(code));\n" " const std::string s2 = sizeof_(code);\n" " return(s1+s2);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar39() { functionVariableUsage("void f() {\n" " int a = 1;\n" " foo(x*a);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar40() { functionVariableUsage("int f() {\n" " int a = 1;\n" " return x & a;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar41() { //garbage code : don't crash functionVariableUsage("{\n" " if (1) = x\n" " else abort s[2]\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar42() { // #3603 - false positive 'x is assigned a value that is never used' functionVariableUsage("int f() {\n" " int x = 1;\n" " int y = FOO::VALUE * x;\n" " return y;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar43() { // #3742 functionVariableUsage("float g_float = 1;\n" "extern void SomeTestFunc(float);\n" "void MyFuncError()\n" "{\n" " const float floatA = 2.2f;\n" " const float floatTot = g_float * floatA;\n" " SomeTestFunc(floatTot);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("float g_float = 1;\n" "extern void SomeTestFunc(float);\n" "void MyFuncNoError()\n" "{\n" " const float floatB = 2.2f;\n" " const float floatTot = floatB * g_float;\n" " SomeTestFunc(floatTot);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("float g_float = 1;\n" "extern void SomeTestFunc(float);\n" "void MyFuncNoError2()\n" "{\n" " const float floatC = 2.2f;\n" " float floatTot = g_float * floatC;\n" " SomeTestFunc(floatTot);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar44() { // ticket #3602 (false positive) functionVariableUsage("void bar()\n" "{\n" " int * piArray = NULL;\n" " unsigned int uiArrayLength = 2048;\n" " unsigned int uiIndex;\n" "\n" " try\n" " {\n" " piArray = new int[uiArrayLength];\n" // Allocate memory " }\n" " catch (...)\n" " {\n" " SOME_MACRO\n" " delete [] piArray;\n" " return;\n" " }\n" " for (uiIndex = 0; uiIndex < uiArrayLength; uiIndex++)\n" " {\n" " piArray[uiIndex] = -1234;\n" " }\n" " delete [] piArray;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar45() { // #4020 - FP functionVariableUsage("void func() {\n" " int *sp_mem[2] = { 0x00, 0x00 };\n" " int src = 1, dst = 2;\n" " sp_mem[(dst + i)][3] = src;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar46() { // #4899 - FP functionVariableUsage("int func() {\n" " int a = 123;\n" " int b = (short)-a;;\n" " return b;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar47() { // #5491/#5494 functionVariableUsage("int func() {\n" " int i = 0;\n" " int j{i};\n" " return j;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int func() {\n" " std::mutex m;\n" " std::unique_lock l{ m };\n" " return 0;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvaralias1() { functionVariableUsage("void foo()\n" "{\n" " int a;\n" " int *b = &a;\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" "}"); 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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); 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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo(int a)\n" "{\n" " int *b = &a;\n" " *b = 0;\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" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int *b = a;\n" " *b = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int a[10];\n" "void foo()\n" "{\n" " int *b = a;\n" " int *c = b;\n" " *c = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = a;\n" " int *c = b;\n" " *c = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = a;\n" " int *c = b;\n" " *c = b[0];\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = a;\n" " int *c;\n" " *c = b[0];\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" " x(c);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = a;\n" " int c = b[0];\n" " x(c);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int a[10];\n" "void foo()\n" "{\n" " int *b = &a[0];\n" " a[0] = b[0];\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = &a[0];\n" " a[0] = b[0];\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int *b = a;\n" " a[0] = b[0];\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo(int a[10])\n" "{\n" " int *b = a;\n" " *b = 0;\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" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int *b = a;\n" " int *c = b;\n" " *c = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (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" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: a\n" "[test.cpp:7]: (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" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: a\n" "[test.cpp:7]: (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" "}"); ASSERT_EQUALS("[test.cpp:9]: (style) Variable 'a' is assigned a value that is never used.\n" "[test.cpp:7]: (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" "}"); ASSERT_EQUALS("[test.cpp:4]: (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" "}"); ASSERT_EQUALS("[test.cpp:4]: (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" "}"); 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" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "}"); 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" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is not assigned a value.\n", errout.str()); functionVariableUsage("void foo() {\n" // #4022 - FP (a is assigned a value that is never used) " int a[2], *b[2];\n" " a[0] = 123;\n" " b[0] = &a[0];\n" " int *d = b[0];\n" " return *d;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo() {\n" // #4022 - FP (a is assigned a value that is never used) " entry a[2], *b[2];\n" " a[0].value = 123;\n" " b[0] = &a[0];\n" " int d = b[0].value;\n" " return d;\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" " s->c[0] = 0;\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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: b\n" "[test.cpp:10]: (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" "}"); ASSERT_EQUALS("[test.cpp:7]: (style) Variable 'b' is assigned a value that is never used.\n" "[test.cpp:9]: (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" " x(a);\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" "}"); 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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'ab' is not assigned a value.\n" "[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" "}"); 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" "}"); 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" "}"); 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" "}"); 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" "}"); 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:6]: (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:6]: (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:7]: (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:7]: (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()); functionVariableUsage("void foo()\n" "{\n" " Foo foo;\n" " Foo &ref = foo;\n" " ref[0] = 123;\n" "}", "test.c"); ASSERT_EQUALS("[test.c:5]: (style) Variable 'foo' is assigned a value that is never used.\n", 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()); functionVariableUsage("void foo(Foo &foo)\n" "{\n" " Foo &ref = foo;\n" " int *x = &ref.x;\n" " *x = 0;\n" "}", "test.c"); ASSERT_EQUALS("", errout.str()); } void localvaralias11() { // #4423 - iterator functionVariableUsage("void f(Foo &foo) {\n" " std::set::iterator x = foo.dostuff();\n" " *(x) = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvaralias12() { // #4394 functionVariableUsage("void f(void) {\n" " int a[4];\n" " int *b = (int*)((int*)a+1);\n" " x(b);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int f(void) {\n" // #4628 " int x=1,y;\n" " y = (x * a) / 100;\n" " return y;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvaralias13() { // #4487 functionVariableUsage("void f(char *p) {\n" " char a[4];\n" " p = a;\n" " strcpy(p, \"x\");\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f(char *p) {\n" " char a[4];\n" " p = a;\n" " strcpy(p, \"x\");\n" "}"); TODO_ASSERT_EQUALS("a is assigned value that is never used", "", errout.str()); } void localvarasm() { functionVariableUsage("void foo(int &b)\n" "{\n" " int a;\n" " asm();\n" " b = a;\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" "}"); 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" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'abc' is assigned a value that is never used.\n", 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" "}"); TODO_ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: x\n" "[test.cpp:4]: (style) Unused variable: z\n", "", errout.str()); } void localvarStruct5() { functionVariableUsage("int foo() {\n" " A a;\n" " return a.i;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo() {\n" " A a;\n" " return 0;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo() {\n" " A a;\n" " return 0;\n" "}\n", "test.c"); ASSERT_EQUALS("[test.c:2]: (style) Unused variable: a\n", errout.str()); functionVariableUsage("struct A { int i; };\n" "int foo() {\n" " A a;\n" " return a.i;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class A { int i; };\n" "int foo() {\n" " A a;\n" " return a.i;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct A { int i; };\n" "int foo() {\n" " A a;\n" " a.i = 0;\n" " return 0;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class A { int i; };\n" "int foo() {\n" " A a;\n" " a.i = 0;\n" " return 0;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct A { int i; };\n" "int foo() {\n" " A a = { 0 };\n" " return 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("class A { int i; };\n" "int foo() {\n" " A a = { 0 };\n" " return 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("class A { int i; public: A(); { } };\n" "int foo() {\n" " A a;\n" " return 0;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct A { int i; };\n" "int foo() {\n" " A a;\n" " return 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: a\n", errout.str()); functionVariableUsage("class A { int i; };\n" "int foo() {\n" " A a;\n" " return 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: a\n", errout.str()); functionVariableUsage("class A { int i; public: A(); { } };\n" "int foo() {\n" " A a;\n" " return 0;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class A { unknown i; };\n" "int foo() {\n" " A a;\n" " return 0;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class A : public Fred { int i; };\n" "int foo() {\n" " A a;\n" " return 0;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class Fred {char c;};\n" "class A : public Fred { int i; };\n" "int foo() {\n" " A a;\n" " return 0;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: a\n", errout.str()); } void localvarStruct6() { functionVariableUsage("class Type { };\n" "class A {\n" "public:\n" " Type & get() { return t; }\n" "private:\n" " Type t;\n" "};"); ASSERT_EQUALS("", errout.str()); } void localvarStructArray() { // #3633 - detect that struct array is assigned a value functionVariableUsage("void f() {\n" " struct X x[10];\n" " x[0].a = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'x' is assigned a value that is never used.\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" "}"); functionVariableUsage(code.c_str()); ASSERT_EQUALS("", errout.str()); } } void localvarInvert() { functionVariableUsage("int main()\n" "{\n" " int tmp = 10;\n" " return ~tmp;\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" "}"); 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" "}"); ASSERT_EQUALS("", errout.str()); } void localvarOpAssign() { functionVariableUsage("void foo()\n" "{\n" " int a = 1;\n" " int b = 2;\n" " a |= b;\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'a' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void foo() {\n" " int a = 1;\n" " (b).x += a;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarFor() { functionVariableUsage("void foo()\n" "{\n" " int a = 1;\n" " for (;a;);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo() {\n" " for (int i = 0; (pci = cdi_list_get(pciDevices, i)); i++)\n" " {}\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarForEach() { // #4155 - foreach functionVariableUsage("void foo() {\n" " int i = -1;\n" " int a[] = {1,2,3};\n" " FOREACH_X (int x, a) {\n" " if (i==x) return x;\n" " i = x;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo() {\n" " int i = -1;\n" " int a[] = {1,2,3};\n" " FOREACH_X (int x, a) {\n" " i = x;\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'i' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void foo() {\n" " int i = -1;\n" " int a[] = {1,2,3};\n" " X (int x, a) {\n" " if (i==x) return x;\n" " i = x;\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (style) Variable 'i' is assigned a value that is never used.\n", errout.str()); // #4956 - assignment in for_each functionVariableUsage("void f(std::vector ints) {\n" " int x = 0;\n" " std::for_each(ints.begin(), ints.end(), [&x](int i){ dostuff(x); x = i; });\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f(std::vector ints) {\n" " int x = 0;\n" " std::for_each(ints.begin(), ints.end(), [&x](int i){ x += i; });\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); // #5154 - MSVC 'for each' functionVariableUsage("void f() {\n" " std::map ints;\n" " ints[0]= 1;\n" " for each(std::pair i in ints) { x += i.first; }\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarShift1() { functionVariableUsage("int foo()\n" "{\n" " int var = 1;\n" " return 1 >> var;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarShift2() { functionVariableUsage("int foo()\n" "{\n" " int var = 1;\n" " while (var = var >> 1) { }\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarShift3() { // #3509 functionVariableUsage("int foo()\n" "{\n" " QList ints;\n" " ints << 1;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo() {\n" // #4320 " int x;\n" " x << 1;\n" " return x;\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" "}"); 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" "}"); ASSERT_EQUALS("", errout.str()); } void localvarUnused() { functionVariableUsage("int foo()\n" "{\n" " bool test __attribute__((unused));\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo()\n" "{\n" " bool test __attribute__((unused)) = true;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo()\n" "{\n" " bool __attribute__((unused)) test;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo()\n" "{\n" " bool __attribute__((unused)) test = true;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo()\n" "{\n" " bool test __attribute__((used));\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo()\n" "{\n" " bool __attribute__((used)) test;\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" "}"); 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" "}"); 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" "}"); 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 j = 0;\n" " static int i(j);\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:6]: (style) Variable 'b' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " static int i = 0;\n" " if(i < foo())\n" " i += 5;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarextern() { functionVariableUsage("void foo() {\n" " extern int i;\n" " i = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvardynamic1() { functionVariableUsage("void foo()\n" "{\n" " void* ptr = malloc(16);\n" " free(ptr);\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" "}"); 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" "}"); 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" "}"); 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" "}"); 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 ( nothrow ) char[16];\n" " delete[] ptr;\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 ( std::nothrow ) char[16];\n" " delete[] ptr;\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" "}"); 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" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " char* ptr = new char[16];\n" " ptr[0] = 123;\n" " delete[] ptr;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " Fred* fred = new Fred;\n" " std::cout << \"test\" << std::endl;\n" " delete fred;\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" "}"); 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" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo()\n" "{\n" " Fred* fred = malloc(sizeof(Fred));\n" " std::cout << \"test\" << std::endl;\n" " free(fred);\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" "}"); ASSERT_EQUALS("", errout.str()); } void localvardynamic2() { functionVariableUsage("struct Fred { int i; };\n" "void foo()\n" "{\n" " Fred* ptr = malloc(sizeof(Fred));\n" " free(ptr);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'ptr' is allocated memory that is never used.\n", errout.str()); functionVariableUsage("struct Fred { int i; };\n" "void foo()\n" "{\n" " Fred* ptr = malloc(sizeof(Fred));\n" " ptr->i = 0;\n" " free(ptr);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct Fred { int i; };\n" "void foo()\n" "{\n" " struct Fred* ptr = malloc(sizeof(Fred));\n" " free(ptr);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'ptr' is allocated memory that is never used.\n", errout.str()); functionVariableUsage("struct Fred { int i; };\n" "void foo()\n" "{\n" " struct Fred* ptr = malloc(sizeof(Fred));\n" " ptr->i = 0;\n" " free(ptr);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct Fred { int i; };\n" "void foo()\n" "{\n" " Fred* ptr = new Fred();\n" " delete ptr;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'ptr' is allocated memory that is never used.\n", errout.str()); functionVariableUsage("struct Fred { int i; };\n" "void foo()\n" "{\n" " Fred* ptr = new (nothrow ) Fred();\n" " delete ptr;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'ptr' is allocated memory that is never used.\n", errout.str()); functionVariableUsage("struct Fred { int i; };\n" "void foo()\n" "{\n" " Fred* ptr = new (std::nothrow) Fred();\n" " delete ptr;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'ptr' is allocated memory that is never used.\n", errout.str()); functionVariableUsage("struct Fred { int i; };\n" "void foo()\n" "{\n" " Fred* ptr = new Fred();\n" " ptr->i = 0;\n" " delete ptr;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct Fred { int i; };\n" "void foo()\n" "{\n" " struct Fred* ptr = new Fred();\n" " free(ptr);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'ptr' is allocated memory that is never used.\n", errout.str()); functionVariableUsage("struct Fred { int i; };\n" "void foo()\n" "{\n" " struct Fred* ptr = new Fred();\n" " ptr->i = 0;\n" " free(ptr);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class Fred { public: int i; };\n" "void foo()\n" "{\n" " Fred* ptr = malloc(sizeof(Fred));\n" " free(ptr);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'ptr' is allocated memory that is never used.\n", errout.str()); functionVariableUsage("class Fred { public: int i; };\n" "void foo()\n" "{\n" " Fred* ptr = malloc(sizeof(Fred));\n" " ptr->i = 0;\n" " free(ptr);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class Fred { public: int i; };\n" "void foo()\n" "{\n" " Fred* ptr = new Fred();\n" " delete ptr;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'ptr' is allocated memory that is never used.\n", errout.str()); functionVariableUsage("class Fred { public: int i; };\n" "void foo()\n" "{\n" " Fred* ptr = new Fred();\n" " ptr->i = 0;\n" " delete ptr;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvardynamic3() { // Ticket #3477 - False positive that 'data' is not assigned a value functionVariableUsage("void foo() {\n" " int* data = new int[100];\n" " int* p = data;\n" " for ( int i = 0; i < 10; ++i )\n" " p++;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvararray1() { functionVariableUsage("void foo() {\n" " int p[5];\n" " *p = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvararray2() { functionVariableUsage("int foo() {\n" " int p[5][5];\n" " p[0][0] = 0;\n" " return p[0][0];\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvararray3() { functionVariableUsage("int foo() {\n" " int p[5][5];\n" " *((int*)p[0]) = 0;\n" " return p[0][0];\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarstring1() { // ticket #1597 functionVariableUsage("void foo() {\n" " std::string s;\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Unused variable: s\n", errout.str()); functionVariableUsage("void foo() {\n" " std::string s;\n" " s = \"foo\";\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 's' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void foo() {\n" " std::string s = \"foo\";\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 's' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("std::string foo() {\n" " std::string s;\n" // Class instances are initialized. Assignment is not necessary " return s;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("std::string foo() {\n" " std::string s = \"foo\";\n" " return s;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarstring2() { // ticket #2929 functionVariableUsage("void foo() {\n" " std::string s;\n" " int i;\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Unused variable: s\n" "[test.cpp:3]: (style) Unused variable: i\n", errout.str()); } void localvarconst1() { functionVariableUsage("void foo() {\n" " const bool b = true;\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'b' is assigned a value that is never used.\n", errout.str()); } void localvarconst2() { functionVariableUsage("void foo() {\n" " const int N = 10;\n" " struct X { int x[N]; };\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarthrow() { // ticket #3687 functionVariableUsage("void foo() {\n" " try {}" " catch(Foo& bar) {}\n" "}"); ASSERT_EQUALS("", errout.str()); } void localVarStd() { functionVariableUsage("void f() {\n" " std::string x = foo();\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void f() {\n" " std::vector x;\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Unused variable: x\n", errout.str()); functionVariableUsage("void f() {\n" " std::vector x(100);\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'x' is assigned a value that is never used.\n", "", errout.str()); functionVariableUsage("void f() {\n" " std::vector x;\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Unused variable: x\n", errout.str()); functionVariableUsage("void f() {\n" " std::vector x(100);\n" // Might have a side-effect "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" " std::lock_guard lock(mutex_);\n" // Has a side-effect #4385 "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" " pLocker = std::shared_ptr(new jfxLocker(m_lock, true));\n" // Could have side-effects (#4355) "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" " std::mutex m;\n" " std::unique_lock lock(m);\n" // #4624 "}"); ASSERT_EQUALS("", errout.str()); } // ticket #3104 - false positive when variable is read with "if (NOT var)" void localvarIfNOT() { functionVariableUsage("void f() {\n" " bool x = foo();\n" " if (NOT x) { }\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarAnd() { // #3672 functionVariableUsage("int main() {\n" " unsigned flag = 0x1 << i;\n" " if (m_errorflags & flag) {\n" " return 1;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarSwitch() { // #3744 - false positive when used in switch functionVariableUsage("const char *f(int x) {\n" " const char a[] = \"abc\";\n" " const char def[] = \"def\";\n" " const char *ptr;\n" " switch(x) {\n" " case 1: ptr=a; break;\n" " default: ptr=def; break;\n" " }\n" " return ptr;\n" "}"); // Don't write an error that "a" is not used ASSERT_EQUALS("", errout.str()); } void localvarNULL() { // #4203 - Setting NULL value is not redundant - it is safe functionVariableUsage("void f() {\n" " char *p = malloc(100);\n" " foo(p);\n" " free(p);\n" " p = NULL;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarUnusedGoto() { // #4447 functionVariableUsage("bool f(const int &i) {\n" " int X = i;\n" "label:\n" " if ( X == 0 ) {\n" " X -= 101;\n" " return true;\n" " }\n" " if ( X < 1001 ) {\n" " X += 1;\n" " goto label;\n" " }\n" " return false;\n" "}\n"); ASSERT_EQUALS("", errout.str()); // #4558 functionVariableUsage("int f() {\n" " int i,j=0;\n" " start:\n" " i=j;\n" " i++;\n" " j=i;\n" " if (i<3)\n" " goto start;\n" " return i;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarCpp11Initialization() { // #6160 functionVariableUsage("void foo() {\n" " int myNewValue{ 3u };\n" " myManager.theDummyTable.addRow(UnsignedIndexValue{ myNewValue }, DummyRowData{ false });\n" "}"); ASSERT_EQUALS("", errout.str()); } void chainedAssignment() { // #5466 functionVariableUsage("void NotUsed(double* pdD, int n) {\n" " double sum = 0.0;\n" " for (int i = 0; i\n" "struct Y: Y { };\n" "template<>\n" "struct Y<0> {};\n" "void f() {\n" " Y y;\n" "}"); // #4695 } void usingNamespace() { functionVariableUsage("int foo() {\n" " using namespace ::com::sun::star::i18n;\n" " bool b = false;\n" " int j = 0;\n" " for (int i = 0; i < 3; i++) {\n" " if (!b) {\n" " j = 3;\n" " b = true;\n" " }\n" " }\n" " return j;\n" "}"); // #4585 ASSERT_EQUALS("", errout.str()); } }; REGISTER_TEST(TestUnusedVar)